2024-03-28T20:24:36Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/151552021-06-23T13:27:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Royuela del Val, Javier
4456c195-aff3-433a-b59d-5c7eb653c77a
500
Simmross Wattenberg, Federico Jesús
16b243954f436287
500
0000-0001-9534-1016
Alberola López, Carlos
d668f9d092c4b27e
500
0000-0003-3684-0055
2015-12-21T11:19:58Z
2015-12-21T11:19:58Z
2015
Journal of Statistical Software
http://uvadoc.uva.es/handle/10324/15155
-stable distributions are a wide family of probability distributions used in many
elds where probabilistic approaches are taken. However, the lack of closed analytical
expressions is a major drawback for their application. Currently, several tools have been
developed to numerically evaluate their density and distribution functions or estimate
their parameters, but available solutions either do not reach su cient precision on their
evaluations or are too slow for several practical purposes. Moreover, they do not take full
advantage of the parallel processing capabilities of current multi-core machines. Other solutions
work only on a subset of the -stable parameter space. In this paper we present a
C/C++ library and a MATLAB front-end that allows fully parallelized, fast and high precision
evaluation of density, distribution and quantile functions (PDF, CDF and CDF1
respectively), random variable generation and parameter estimation of -stable distributions
in their whole parameter space. The library provided can be easily integrated on
third party developments.
application/pdf
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Alpha-stable distributions
Numerical calculation
Parallel processing
Libstable: Fast, Parallel and High-Precision Computation of -Stable Distributions in C/C++ and MATLAB
info:eu-repo/semantics/article
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oai:uvadoc.uva.es:10324/15155
2021-06-23 15:27:17.796
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oai:uvadoc.uva.es:10324/151542021-06-28T11:17:19Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Royuela del Val, Javier
4456c195-aff3-433a-b59d-5c7eb653c77a
500
Cordero Grande, Lucilio
5b4afc24-d4b3-4a05-a046-222a80d5914a
500
Simmross Wattenberg, Federico Jesús
16b243954f436287
500
0000-0001-9534-1016
Martín Fernández, Marcos Antonio
cc971ff28d2b8def
500
0000-0001-9342-9989
Alberola López, Carlos
d668f9d092c4b27e
500
0000-0003-3684-0055
2015-12-21T11:11:52Z
2015-12-21T11:11:52Z
2015
Magnetic Resonance in Medicine (aceptado para su publicación)
http://uvadoc.uva.es/handle/10324/15154
Purpose: Compressed sensing methods with motion estimation and compensation techniques
have been proposed for the reconstruction of accelerated dynamic MRI. However, artifacts that
naturally arise in compressed sensing reconstruction procedures hinder the estimation of motion
from reconstructed images, especially at high acceleration factors. This work introduces a robust
groupwise non-rigid motion estimation technique applied to the compressed sensing reconstruction
of dynamic cardiac cine MRI sequences.
Theory and Methods: A spatio-temporal regularized, groupwise, non-rigid registration method
based on a B-splines deformation model and a least squares metric is used to estimate and to
compensate the movement of the heart in breath-hold cine acquisitions and to obtain a quasi-static
sequence with highly sparse representation in temporally transformed domains.
Results: Short axis in vivo datasets are used for validation, both original multi-coil as well as
DICOM data. Fully sampled data were retrospectively undersampled with various acceleration
factors and reconstructions were compared with the two well-known methods k-t FOCUSS and
MASTeR. The proposed method achieves higher signal to error ratio and structure similarity index
for medium to high acceleration factors.
Conclusions: Reconstruction methods based on groupwise registration show higher quality recon-
structions for cardiac cine images than the pairwise counterparts tested.
application/pdf
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
dynamic MRI reconstruction, compressive sensing, groupwise registration
Non-Rigid Groupwise Registration for Motion Estimation and Compensation in Compressed Sensing Reconstruc- tion of Breath-Hold Cardiac Cine MRI
info:eu-repo/semantics/article
http://onlinelibrary.wiley.com/doi/10.1002/mrm.25733/pdf
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2021-06-28 13:17:19.439
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oai:uvadoc.uva.es:10324/151562021-06-23T13:27:18Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Cordero Grande, Lucilio
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Royuela del Val, Javier
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Sanz Estébanez, Santiago Rodrigo
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Martín Fernández, Marcos Antonio
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0000-0001-9342-9989
Alberola López, Carlos
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0000-0003-3684-0055
2015-12-21T11:25:58Z
2015-12-21T11:25:58Z
2015
Medical Image Analysis (en prensa)
http://uvadoc.uva.es/handle/10324/15156
doi:10.1016/j.media.2015.12.001
The purpose of this work is to develop a method for direct estimation of
the cardiac strain tensor by extending the harmonic phase reconstruction on
tagged magnetic resonance images to obtain more precise and robust measurements.
The extension relies on the reconstruction of the local phase of
the image by means of the windowed Fourier transform and the acquisition of
an overdetermined set of stripe orientations in order to avoid the phase interferences
from structures outside the myocardium and the instabilities arising
from the application of a gradient operator. Results have shown that increasing
the number of acquired orientations provides a signi cant improvement
in the reproducibility of the strain measurements and that the acquisition of
an extended set of orientations also improves the reproducibility when compared
with acquiring repeated samples from a smaller set of orientations.
Additionally, biases in local phase estimation when using the original harmonic
phase formulation are greatly diminished by the one here proposed.
The ideas here presented allow the design of new methods for motion sensitive
magnetic resonance imaging, which could simultaneously improve the
resolution, robustness and accuracy of motion estimates.
application/pdf
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Tagged Magnetic Resonance Imaging
Harmonic Phase Reconstruction
Artifacts
Strain Tensor
Windowed Fourier Transform
Multi-Oriented Windowed Harmonic Phase Reconstruction for Robust Cardiac Strain Imaging
info:eu-repo/semantics/article
SI
ORIGINAL
MOWHARP.pdf
MOWHARP.pdf
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2021-06-23 15:27:18.781
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/151572021-06-23T13:27:20Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merino Caviedes, Susana
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500
Cordero Grande, Lucilio
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500
Revilla Orodea, Ana
f4e67eae-ceb9-4f71-873e-ee9592275d5f
500
Sevilla Ruiz, María Teresa
71d1d11f-e593-4497-8a70-3e48fdf9859d
500
Pérez García, María Teresa
8ef7cb64c0b359f5
500
0000-0001-8540-8117
Martín Fernández, Marcos Antonio
cc971ff28d2b8def
500
0000-0001-9342-9989
Alberola López, Carlos
d668f9d092c4b27e
500
0000-0003-3684-0055
2015-12-21T11:35:50Z
2015-12-21T11:35:50Z
2014
IEEE Transactions on Medical Imaging, Vol. 33, No. 1, pp. 23-37, Enero 2014.
http://uvadoc.uva.es/handle/10324/15157
10.1109/TMI.2013.2276765
We propose a fully three-dimensional methodology
for the computation of myocardial non-viable tissue transmurality
in contrast enhanced magnetic resonance images. The outcome
is a continuous map defined within the myocardium where not
only current state-of-the-art measures of transmurality can be
calculated, but also information on the location of non-viable
tissue is preserved. The computation is done by means of a
partial differential equation framework we have called Multi-
Stencil Streamline Fast Marching (MSSFM). Using it, the myocardial
and scarred tissue thickness is simultaneously computed.
Experimental results show that the proposed 3D method allows
for the computation of transmurality in myocardial regions where
current 2D methods are not able to as conceived, and it also
provides more robust and accurate results in situations where the
assumptions on which current 2D methods are based —i.e., there
is a visible endocardial contour and its corresponding epicardial
points lie on the same slice—, are not met.
application/pdf
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Perfusion imaging
heart
quantification and estimation
myocardial viability
transmurality
fast marching
Multi-Stencil Streamline Fast Marching: a general 3D Framework to determine Myocardial Thickness and Transmurality in Late Enhancement Images
info:eu-repo/semantics/article
SI
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2021-06-23 15:27:20.32
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oai:uvadoc.uva.es:10324/151672021-06-23T13:27:22Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ramos Llordén, Gabriel
f9c0d809-9f23-4565-a60b-187ae6eb7c07
500
Vegas Sánchez-Ferrero, Gonzalo
c432bc3e-9453-40ff-aef2-1e9e7c562261
500
Martín Fernández, Marcos Antonio
cc971ff28d2b8def
500
0000-0001-9342-9989
Alberola López, Carlos
d668f9d092c4b27e
500
0000-0003-3684-0055
Aja Fernández, Santiago
34d13732f8a94aa3
500
0000-0002-5337-5071
2015-12-21T13:01:21Z
2015-12-21T13:01:21Z
2015
IEEE Trans. on Image Processing, Vol. 24, No. 1, Enero 2015
http://uvadoc.uva.es/handle/10324/15167
10.1109/TIP.2014.2371244
Ultrasound imaging exhibits considerable difficulties for medical visual inspection and for the development of automatic
analysis methods due to speckle, which negatively affects the perception of tissue boundaries and the performance of automatic
segmentation methods. With the aim of alleviating the effect of speckle, many filtering techniques are usually considered as a
preprocessing step prior to automatic analysis methods or visual inspection. Most of the state-of-the-art filters try to reduce the
speckle effect without considering its relevance for the characterization of tissue nature. However, the speckle phenomenon is the
inherent response of echo signals in tissues and can provide important features for clinical purposes. This loss of information
is even magnified due to the iterative process of some speckle filters, e.g., diffusion filters, which tend to produce over-filtering
because of the progressive loss of relevant information for diagnostic purposes during the diffusion process. In this work, we
propose an anisotropic diffusion filter with a probabilistic-driven memory mechanism to overcome the over-filtering problem by
following a tissue selective philosophy. Specifically, we formulate the memory mechanism as a delay differential equation for
the diffusion tensor whose behavior depends on the statistics of the tissues, by accelerating the diffusion process in meaningless
regions and including the memory effect in regions where relevant details should be preserved. Results both in synthetic and real
US images support the inclusion of the probabilistic memory mechanism for maintaining clinical relevant structures, which are
removed by the state-of-the-art filters.
application/pdf
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Ultrasound Imaging
Speckle Filter
Anisotropic Diffusion
Memory Equations
Volterra Equations
Anisotropic Diffusion Filter with Memory based on Speckle Statistics for Ultrasound Images
info:eu-repo/semantics/article
SI
ORIGINAL
TIP_2014 - Gabriel_backup.pdf
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/213722021-06-23T13:27:38Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
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Prieto, Luis P.
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Asensio Pérez, Juan Ignacio
928957e48dbad0f9
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0000-0002-1114-2819
Martínez Monés, Alejandra
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500
0000-0003-3201-0345
Jorrín Abellán, Iván Manuel
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500
Dimitriadis Damoulis, Ioannis
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0000-0001-7275-2242
2016-11-30T13:44:01Z
2016-11-30T13:44:01Z
2015
Muñoz-Cristóbal, J. A., Prieto, L. P., Asensio-Pérez, J. I., Martínez-Monés, A., Jorrín-Abellán, I. M., & Dimitriadis, Y. (2015). Coming down to Earth: Helping teachers use 3D virtual worlds in across-spaces learning situations. Journal of Educational Technology & Society, 18(1), p. 13-26
1436-4522
http://uvadoc.uva.es/handle/10324/21372
13
1
26
Journal of Educational Technology & Society
18
Producción Científica
Different approaches have explored how to provide seamless learning across multiple ICT-enabled physical and virtual spaces, including three-dimensional virtual worlds (3DVW). However, these approaches present limitations that may reduce their acceptance in authentic educational practice: The difficulties of authoring and sharing teacher-created designs across different 3DVW platforms, or the lack of integration of 3DVWs with existing technologies in the classroom ecosystem (e.g., widespread web-based learning platforms such as Moodle, or mobile augmented reality applications). Focusing on a specific kind of 3DVW (virtual globes, such as Google Earth, used like 3DVWs), we propose a system that enables teachers to deploy across-spaces learning situations, which can be authored with a plethora of existing learning design tools, that involve different common web-based learning platforms, mobile AR applications and multiple kinds of virtual globes. A prototype of the architecture has been developed to evaluate this novel approach. The mixed-methods evaluation performed comprised both a feature analysis and a study where a teacher deployed an authentic across-spaces learning situation including Google Earth used as a 3DVW. Such evaluation shows that the system enables teachers deploy learning situations over different technological ecosystems composed by physical and web spaces, as well as by 3DVWs.
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14)
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International Forum of Educational Technology and Society
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Realidad virtual
Google Earth
Coming down to Earth: Helping teachers use 3D virtual worlds in across-spaces learning situations
info:eu-repo/semantics/article
http://www.ifets.info/
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CC-LICENSE
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https://uvadoc.uva.es/bitstream/10324/21372/2/license_url
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2021-06-23 15:27:38.865
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/215122021-06-23T13:27:49Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gallego Lema, Vanesa
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Muñoz Cristóbal, Juan Alberto
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Arribas Cubero, Higinio Francisco
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Rubia Avi, Bartolomé
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0000-0002-4963-4552
2016-12-09T19:38:02Z
2016-12-09T19:38:02Z
2016
RELATEC: Revista Latinoamericana de Tecnología Educativa, 2016, vol. 15, nº 1, p. 59-73
1695-288X
http://uvadoc.uva.es/handle/10324/21512
10.17398/1695288X. 15.1.59
59
1
73
RELATEC: Revista Latinoamericana de Tecnología Educativa
15
Producción Científica
Este artículo presenta un proceso formativo de aprendizaje ubicuo con apoyo tecnológico, desarrollado en el área de Educación Física en el Medio Natural (EFMN). La investigación ha permitido analizar cómo repercute el aprendizaje ubicuo en la enseñanza/aprendizaje en el Grado de Educación Primaria en Educación Física, apoyándose en estudios de caso. Entre otros resultados, el aprendizaje ubicuo ha favorecido que el alumnado y el profesor hayan interactuado en el proceso desde distintos espacios y momentos, uniendo los ámbitos formales e informales, así como aportando un beneficio en los distintos elementos del currículum oficial. De esta manera, el alumnado ha incrementado su competencia digital, junto con una mejor adquisición de los contenidos de la asignatura, superando las distintas problemáticas que han emergido durante el proceso. Las conclusiones señalan que las herramientas tecnológicas han apoyado el currículum de EFMN, favoreciendo un proceso formativo ubicuo. Describimos la experiencia formativa realizada en la asignatura durante el curso 2012-2013, junto con su implementación tecnológica.
In this paper we present a technologysupported ubiquitous learning process, developed in the area of Physical Education in the Natural Environment. The research conducted allowed us to analyze how ubiquitous learning impacted on the teaching / learning process in a university degree on Primary Education with a major in Physical Education, using a case study method.
Among other findings, the research results suggest that ubiquitous learning encouraged students and teacher to interact in the learning process from different places and times, linking formal and informal settings, as well as providing a benefit in different elements of the official curriculum. In this way, students increased its digital competence and they achieved a better understanding of the contents of the subject, overcoming problems that emerged during the process. The conclusions we reached point out that technological tools supported the EFMN curriculum, causing an ubiquitous training process. In this paper, we describe the educational experience carried out in the subject during the 20122013 academic year, as well as the technological implementation performed.
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14)
Ministerio de Economía, Industria y Competitividad (TIN201453199C32R)
application/pdf
spa
Universidad de Extremadura
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Tecnología educativa
Docentes-Formación
Educación física
Aprendizaje ubicuo: un proceso formativo en educación física en el medio natural
Ubiquitous learning: a learning process in Physical Education in the Natural Environment
info:eu-repo/semantics/article
http://relatec.unex.es
SI
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oai:uvadoc.uva.es:10324/215292021-09-10T09:32:09Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gutiérrez Tobal, Gonzalo César
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Álvarez González, Daniel
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Gómez Pilar, Javier
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Campo Matias, Félix del
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500
0000-0002-4554-2167
Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-12T12:35:40Z
2016-12-12T12:35:40Z
2015
Entropy 2015, 17, p. 123-141
ISSN 1099-4300
http://uvadoc.uva.es/handle/10324/21529
10.3390/e17010123
17
Entropy
Producción Científica
Heart rate variability (HRV) provides useful information about heart dynamics
both under healthy and pathological conditions. Entropy measures have shown their utility
to characterize these dynamics. In this paper, we assess the ability of spectral entropy (SE)
and multiscale entropy (MsE) to characterize the sleep apnoea-hypopnea syndrome (SAHS)
in HRV recordings from 188 subjects. Additionally, we evaluate eventual differences in
these analyses depending on the gender. We found that the SE computed from the very low
frequency band and the low frequency band showed ability to characterize SAHS regardless
the gender; and that MsE features may be able to distinguish gender specificities. SE and
MsE showed complementarity to detect SAHS, since several features from both analyses
were automatically selected by the forward-selection backward-elimination algorithm.
Finally, SAHS was modelled through logistic regression (LR) by using optimum sets of
selected features. Modelling SAHS by genders reached significant higher performance than
doing it in a jointly way. The highest diagnostic ability was reached by modelling SAHS in
women. The LR classifier achieved 85.2% accuracy (Acc) and 0.951 area under the ROC
curve (AROC). LR for men reached 77.6% Acc and 0.895 AROC, whereas LR for the whole set reached 72.3% Acc and 0.885 AROC. Our results show the usefulness of the SE and MsE
analyses of HRV to detect SAHS, as well as suggest that, when using HRV, SAHS may be
more accurately modelled if data are separated by gender.
Ministerio de Economía, Industria y Competitividad (TEC2011-22987)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA059U13)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
sleep apnoea
Assessment of Time and Frequency Domain Entropies to Detect Sleep Apnoea in Heart Rate Variability Recordings from Men and Women
info:eu-repo/semantics/article
www.mdpi.com/journal/entropy
SI
LICENSE
license.txt
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oai:uvadoc.uva.es:10324/215552021-06-23T13:27:51Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gómez Pilar, Javier
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500
Poza Crespo, Jesús
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0000-0001-8577-9559
Bachiller Matarranz, Alejandro
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500
Gómez Peña, Carlos
c15f35f90dbac93e
500
0000-0002-9488-0605
Molina Rodríguez, Vicente
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500
0000-0003-2457-2487
Hornero Sánchez, Roberto
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500
0000-0001-9915-2570
2016-12-13T07:40:34Z
2016-12-13T07:40:34Z
2015
Entropy 2015, 17, p. 5241-5256
1099-4300
http://uvadoc.uva.es/handle/10324/21555
10.3390/e17085241
Producción Científica
The aim of the present study was to characterize the neural network
reorganization during a cognitive task in schizophrenia (SCH) by means of wavelet
entropy (WE). Previous studies suggest that the cognitive impairment in patients with SCH
could be related to the disrupted integrative functions of neural circuits. Nevertheless,
further characterization of this effect is needed, especially in the time-frequency domain.
This characterization is sensitive to fast neuronal dynamics and their synchronization that
may be an important component of distributed neuronal interactions; especially in light of
the disconnection hypothesis for SCH and its electrophysiological correlates. In this work,
the irregularity dynamics elicited by an auditory oddball paradigm were analyzed through
synchronized-averaging (SA) and single-trial (ST) analyses. They provide complementary
information on the spatial patterns involved in the neural network reorganization. Our
results from 20 healthy controls and 20 SCH patients showed a WE decrease from baseline
to response both in controls and SCH subjects. These changes were significantly more pronounced for healthy controls after ST analysis, mainly in central and frontopolar areas.
On the other hand, SA analysis showed more widespread spatial differences than ST
results. These findings suggest that the activation response is weakly phase-locked to
stimulus onset in SCH and related to the default mode and salience networks. Furthermore,
the less pronounced changes in WE from baseline to response for SCH patients suggest an
impaired ability to reorganize neural dynamics during an oddball task.
Ministerio de Economía, Industria y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA059U13)
Fondo de Investigaciones Sanitarias del Instituto de Salud Carlos III” (FIS PI1102303)
Gerencia Regional de Salud de Castilla y León” (GRS 613/A/11; GRS 932/A/14)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
wavelet entropy
Neural Network Reorganization Analysis During an Auditory Oddball Task in Schizophrenia Using Wavelet Entropy
info:eu-repo/semantics/article
SI
ORIGINAL
Jul_2015_Entropy_(OpenAccess).pdf
Jul_2015_Entropy_(OpenAccess).pdf
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2021-06-23 15:27:51.128
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oai:uvadoc.uva.es:10324/215592021-06-23T13:27:29Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Khadmaoui, Amine
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500
Gómez Peña, Carlos
c15f35f90dbac93e
500
0000-0002-9488-0605
Poza Crespo, Jesús
c33645a6dc1b0f93
500
0000-0001-8577-9559
Bachiller Matarranz, Alejandro
c189a28b-a277-4b38-bd14-6652ea916bc6
500
Fernández, Alberto
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Quintero, Javier
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-13T08:14:38Z
2016-12-13T08:14:38Z
2016
Computational Intelligence and Neuroscience, Volume 2016, Article ID 8450241, 10 pages
1687-5265
http://uvadoc.uva.es/handle/10324/21559
10.1155/2016/8450241
Producción Científica
The aim of the present study was to explore the interchannel relationships of resting-state brain activity in patients with attentiondeficit/hyperactivity disorder (ADHD), one of the most common mental disorders that develop in children. Magnetoencephalographic (MEG) signals were recorded using a 148-channel whole-head magnetometer in 13 patients with ADHD (range: 8–12 years) and 14 control subjects (range: 8–13 years).Three complementary measures (coherence, phase-locking value, and Euclidean distance) were calculated in the conventionalMEG frequency bands: delta, theta, alpha, beta, and gamma. Our results showed that the interactions among MEG channels are higher for ADHD patients than for control subjects in all frequency bands. Statistically significant differences were observed for short-distance values within right-anterior and central regions, especially at delta, beta,
and gamma-frequency bands (𝑝 < 0.05; Mann-Whitney 𝑈 test with false discovery rate correction). These frequency bands also showed statistically significant differences in long-distance interactions, mainly among anterior and central regions, as well as among anterior, central, and other areas. These differences might reflect alterations during brain development in children with ADHD. Our results support the role of frontal abnormalities in ADHD pathophysiology, which may reflect a delay in cortical maturation in the frontal cortex.
Ministerio de Economía, Industria y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA059U13
application/pdf
eng
Hindawi Publishing Corporation
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Neural Interactions
MEG Analysis of Neural Interactions in Attention-Deficit/Hyperactivity Disorder
info:eu-repo/semantics/article
https://www.hindawi.com/
SI
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oai:uvadoc.uva.es:10324/215902021-09-10T09:32:39Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gutiérrez Tobal, Gonzalo César
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Alonso Álvarez, María Luz
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Álvarez González, Daniel
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Campo Matias, Félix del
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0000-0002-4554-2167
Terán Santos, Joaquín
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-13T12:32:40Z
2016-12-13T12:32:40Z
2015
Biomedical Signal Processing and Control 18 (2015) 401–407
1746-8094
http://uvadoc.uva.es/handle/10324/21590
10.1016/j.bspc.2015.02.014
Producción Científica
The obstructive sleep apnea syndrome (OSAS) greatly affects both the health and the quality of life of chil-dren. Therefore, an early diagnosis is crucial to avoid their severe consequences. However, the standarddiagnostic test (polysomnography, PSG) is time-demanding, complex, and costly. We aim at assessinga new methodology for the pediatric OSAS diagnosis to reduce these drawbacks. Airflow (AF) and oxy-gen saturation (SpO2) at-home recordings from 50 children were automatically processed. Informationfrom the spectrum of AF was evaluated, as well as combined with 3% oxygen desaturation index (ODI3)through a logistic regression model. A bootstrap methodology was conducted to validate the results.OSAS significantly increased the spectral content of AF at two abnormal frequency bands below (BW1)and above (BW2) the normal respiratory range. These novel bands are consistent with the occurrenceof apneic events and the posterior respiratory overexertion, respectively. The spectral information fromBW1 and BW2 showed complementarity both between them and with ODI3. A logistic regression modelbuilt with 3 AF spectral features (2 from BW1 and 1 from BW2) and ODI3 achieved (mean and 95% confi-dence interval): 85.9% sensitivity [64.5–98.7]; 87.4% specificity [70.2–98.6]; 86.3% accuracy [74.9–95.4];0.947 area under the receiver-operating characteristics curve [0.826–1]; 88.4% positive predictive value[72.3–98.5]; and 85.8% negative predictive value [65.8–98.5]. The combination of the spectral informationfrom two novel AF bands with the ODI3 from SpO2is useful for the diagnosis of OSAS in children.
Ministerio de Economía y Competitividad (project TEC2011-22987)
Junta de Castilla y León (project VA059U13)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Pediatric obstructive sleep apnea
Diagnosis of pediatric obstructive sleep apnea: Preliminary findingsusing automatic analysis of airflow and oximetry recordings obtainedat patients’ home
info:eu-repo/semantics/article
http://www.sciencedirect.com
SI
CC-LICENSE
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GutierrezTobal_etal_2015_BiomedicalSignalProcessingandControl_post-review.pdf
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oai:uvadoc.uva.es:10324/215912021-06-23T13:27:39Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Monge, Jesús
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500
Gómez Peña, Carlos
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0000-0002-9488-0605
Poza Crespo, Jesús
c33645a6dc1b0f93
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0000-0001-8577-9559
Fernández, Alberto
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500
Quintero, Javier
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-13T12:39:07Z
2016-12-13T12:39:07Z
2015
Medical Engineering and Physics 37 (2015) 416–423
1350-4533
http://uvadoc.uva.es/handle/10324/21591
10.1016/j.medengphy.2015.02.006
Producción Científica
The aim of this study was to analyze the neural dynamics in attention-deficit/hyperactivity disorder (ADHD). For this purpose, magnetoencephalographic (MEG) background activity was analyzed using fuzzy entropy (FuzzyEn), an entropy measure that quantifies signal irregularity, in 13 ADHD patients and 14 control children. Additionally, relative power (RP) was computed in conventional frequency bands (delta, theta, alpha, beta and gamma). FuzzyEn results showed that MEG activity was more regular in ADHD patients than in controls. Moreover, we found an increase of power in delta band and a decrease in the remaining frequency bands. Statistically significant differences (p-values <0.05; nonparametric permutation test for multiple comparisons) were detected for FuzzyEn in the posterior and left temporal regions, and for RP in the posterior, anterior and left temporal regions. Our results support the hypothesis that ADHD involves widespread functional brain abnormalities, affecting more areas than fronto-striatal circuits, such as the left temporal and posterior regions.
Ministerio de Economía y Competitividad (project TEC2011-22987)
Junta de Castilla y León (project BIO/VA38/14 and project VA059U13)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Attention-deficit/hyperactivitydisorder
MEG analysis of neural dynamics in attention-deficit/hyperactivity disorder with fuzzy entropy
info:eu-repo/semantics/article
SI
ORIGINAL
Monge_etal_2015_MedicalEngineeringandPhysics_post-review.pdf
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oai:uvadoc.uva.es:10324/215932021-06-23T13:27:24Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Bachiller Matarranz, Alejandro
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Romero, Sergio
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Molina Rodríguez, Vicente
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0000-0003-2457-2487
Alonso, Joan F.
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Mañanas, Miguel A.
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Poza Crespo, Jesús
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-13T12:45:30Z
2016-12-13T12:45:30Z
2015
Schizophrenia Research, 2015, vol. 169, p. 318–325
0920-9964
http://uvadoc.uva.es/handle/10324/21593
10.1016/j.schres.2015.09.028
Producción Científica
The present study investigates the neural substrates underlying cognitive processing in schizophrenia (Sz) patients. To this end, an auditory 3-stimulus oddball paradigm was used to identify P3a and P3b components, elicited by rare-distractor and rare-target tones, respectively. Event-related potentials (ERP) were recorded from 31 Sz patients and 38 healthy controls. The P3a and P3b brain-source generators were identified by timeaveraging
of low-resolution brain electromagnetic tomography (LORETA) current density images. In contrast with the commonly used fixed window of interest (WOI), we proposed to apply an adaptive WOI, which takes into account subjects' P300 latency variability. Our results showed different P3a and P3b source activation patterns in both groups. P3b sources included frontal, parietal and limbic lobes,whereas P3a response generators were localized over bilateral frontal and superior temporal regions. These areas have been related to the discrimination of auditory stimulus and to the inhibition (P3a) or the initiation (P3b) of motor response in a
cognitive task. In addition, differences in source localization between Sz and control groups were observed. Sz patients showed lower P3b source activity in bilateral frontal structures and the cingulate. P3a generators were less widespread for Sz patients than for controls in right superior, medial and middle frontal gyrus. Our findings suggest that target and distractor processing involves distinct attentional subsystems, both being altered in Sz. Hence, the study of neuroelectric brain information can provide further insights to understand cognitive
processes and underlying mechanisms in Sz.
Ministerio de Economía y Competitividad (projects TEC2014-53196-R, DPI2011-22680 and DPI2014-59049-R),
Junta de Castilla y León (VA059U13)
Instituto de Salud Carlos III’, ISCIII (FIS PI1102303)
Gerencia Regional de Salud de Castilla y León (GRS 613/A/11; GRS 932/A/14)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Schizophrenia
Auditory P3a and P3b neural generators in schizophrenia: An adaptive sLORETA P300 localization approach
info:eu-repo/semantics/article
http://www.sciencedirect.com/
SI
ORIGINAL
Bachiller_etal_2015_SchizoResearch_post-review.pdf
Bachiller_etal_2015_SchizoResearch_post-review.pdf
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oai:uvadoc.uva.es:10324/215942021-09-10T09:33:45Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Marcos, J. Víctor
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
Nabney, Ian T.
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Álvarez González, Daniel
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Gutiérrez Tobal, Gonzalo César
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Campo Matias, Félix del
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0000-0002-4554-2167
2016-12-13T12:52:04Z
2016-12-13T12:52:04Z
2016
Medical Engineering and Physics 38 (2016) 216–224
1350-4533
http://uvadoc.uva.es/handle/10324/21594
10.1016/j.medengphy.2015.11.010
Producción Científica
The relationship between sleep apnoea–hypopnoea syndrome (SAHS) severity and the regularity of noctur- nal oxygen saturation (SaO 2 ) recordings was analysed. Three different methods were proposed to quantify regularity: approximate entropy (AEn), sample entropy (SEn) and kernel entropy (KEn). A total of 240 sub- jects suspected of suffering from SAHS took part in the study. They were randomly divided into a training set (96 subjects) and a test set (144 subjects) for the adjustment and assessment of the proposed methods, respectively. According to the measurements provided by AEn, SEn and KEn, higher irregularity of oximetry signals is associated with SAHS-positive patients. Receiver operating characteristic (ROC) and Pearson corre- lation analyses showed that KEn was the most reliable predictor of SAHS. It provided an area under the ROC curve of 0.91 in two-class classification of subjects as SAHS-negative or SAHS-positive. Moreover, KEn mea- surements from oximetry data exhibited a linear dependence on the apnoea–hypopnoea index, as shown by a correlation coefficient of 0.87. Therefore, these measurements could be used for the development of simplified diagnostic techniques in order to reduce the demand for polysomnographies. Furthermore, KEn represents a convincing alternative to AEn and SEn for the diagnostic analysis of noisy biomedical signals.
Junta de Castilla y León (project VA059U13)
Ministerio de Economía y Competitividad (project TEC 2011–22987)
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eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Oxygen saturation
Regularity analysis of nocturnal oximetry recordings to assist in the diagnosis of sleep apnoea syndrome
info:eu-repo/semantics/article
http://www.elsevier.com/locate/medengphy
SI
CC-LICENSE
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Marcos_et al_2016_MedicalEngineeringandPhysics_post-review.pdf
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oai:uvadoc.uva.es:10324/216792021-09-10T09:34:12Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gutiérrez Tobal, Gonzalo César
5aad4a2c-9b6e-4cf1-95ce-8adfd60e25b5
500
Álvarez González, Daniel
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Campo Matias, Félix del
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0000-0002-4554-2167
Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T06:45:22Z
2016-12-14T06:45:22Z
2016
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 63, NO. 3, MARCH 2016
0018-9294
http://uvadoc.uva.es/handle/10324/21679
10.1109/TBME.2015.2467188
Producción Científica
The purpose of this study is to evaluate the usefulness of the boosting algorithm AdaBoost (AB) in the context of the sleep apnea-hypopnea syndrome (SAHS) diagnosis. Methods: We characterize SAHS in single-channel airflow (AF) signals from 317 subjects by the extraction of spectral and non-linear features. Relevancy and redundancy analyses are conducted through the fast correlation-based filter (FCBF) to derive the optimum set of features among them. These are used to feed classifiers based on linear discriminant analysis (LDA) and classification and regression trees (CART). LDA and CART models are sequentially obtained through AB, which combines their performances to reach higher diagnostic ability than each of them separately. Results: Our AB-LDA and AB-CART approaches showed high diagnostic performance when determining SAHS and its severity. The assessment of different apnea-hypopnea index cutoffs using an independent test set derived into high accuracy: 86.5% (5 events/h), 86.5% (10 events/h), 81.0% (15 events/h), and 83.3% (30 events/h). These results widely outperformed those from logistic regression and a conventional event-detection algorithm applied to the same database. Conclusion: Our results suggest that AB applied to data from single-channel AF can be useful to determine SAHS and its severity. Significance: SAHS detection might be simplified through the only use of single-channel AF data.
Ministerio de Economía y Competitividad (project TEC2011-22987)
Junta de Castilla y León (project VA059U13)
application/pdf
eng
Institute of Electrical and Electronics Engineers (IEEE)
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
AdaBoost
Utility of AdaBoost to Detect Sleep Apnea-Hypopnea Syndrome From Single-Channel Airflow
info:eu-repo/semantics/article
SI
CC-LICENSE
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2021-09-10 11:34:12.896
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/216802021-06-23T13:27:34Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gómez Peña, Carlos
c15f35f90dbac93e
500
0000-0002-9488-0605
Poza Crespo, Jesús
c33645a6dc1b0f93
500
0000-0001-8577-9559
Gutiérrez, María T.
c253bec7-7f87-4d24-850a-cfd4192ea284
500
Prada, Esther
79c13bc5-4e5e-4fd5-a0fc-d68e8365a47a
500
Mendoza, Nuria
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500
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-14T06:57:05Z
2016-12-14T06:57:05Z
2016
Computer methods and programs in biomedicine 136 ( 2016 ) 1–9
0169-2607
http://uvadoc.uva.es/handle/10324/21680
10.1016/j.cmpb.2016.08.008
Producción Científica
Background and objective. The aim of this study was to assess the changes induced in electroencephalographic (EEG) activity by a Snoezelen® intervention on individuals with brain-injury and control subjects. Methods: EEG activity was recorded preceding and following a Snoezelen® session in 18 people with cerebral palsy (CP), 18 subjects who have sustained traumatic brain-injury (TBI) and 18 controls. EEG data were analyzed by means of spectral and nonlinear measures: median frequency (MF), individual alpha frequency (IAF), sample entropy (SampEn) and Lempel-Ziv complexity (LZC). Results: Our results showed decreased values for MF, IAF, SampEn and LZC as a consequence of the therapy. The main changes between pre-stimulation and post-stimulation conditions were found in occipital and parietal brain areas. Additionally, these changes are more widespread in controls than in brain-injured subjects, which can be due to cognitive deficits in TBI and CP groups. Conclusions: Our findings support the notion that Snoezelen® therapy affects central nervous system, inducing a slowing of oscillatory activity, as well as a decrease of EEG complexity and irregularity. These alterations seem to be related with higher levels of relaxation of the participants.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (VA059U13 y BIO/VA08/15)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Brain-injury
Characterization of EEG patterns in brain-injured subjects and controls after a Snoezelen® intervention
info:eu-repo/semantics/article
SI
CC-LICENSE
license_url
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49
https://uvadoc.uva.es/bitstream/10324/21680/2/license_url
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ORIGINAL
Gomez_etal_2016_ComputerMethodsandProgramsinBiomedicine_post-review.pdf
Gomez_etal_2016_ComputerMethodsandProgramsinBiomedicine_post-review.pdf
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Gomez_etal_2016_ComputerMethodsandProgramsinBiomedicine_post-review.pdf.jpg
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oai:uvadoc.uva.es:10324/21680
2021-06-23 15:27:34.645
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oai:uvadoc.uva.es:10324/216812021-06-23T13:27:40Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
García Gadañón, María
f8eed376a5a5883a
500
0000-0002-4037-0351
Poza Crespo, Jesús
c33645a6dc1b0f93
500
0000-0001-8577-9559
Bachiller Matarranz, Alejandro
c189a28b-a277-4b38-bd14-6652ea916bc6
500
Santamarta Gómez, David
ec8a7dc5-caef-41a8-a84b-da9d78432457
500
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-14T07:10:17Z
2016-12-14T07:10:17Z
2016
computer methods and programs in biomedicine 134 ( 2016 ) 225–235
0169-2607
http://uvadoc.uva.es/handle/10324/21681
10.1016/j.cmpb.2016.06.007
Producción Científica
Hydrocephalus comprises a number of conditions
characterised by clinical symptoms, dilated ventricles and anomalous cerebrospinal fluid
(CSF) dynamics. Infusion tests (ITs) are usually performed to study CSF circulation and in
the preoperatory evaluation of patients with hydrocephalus. The study of intracranial pressure
(ICP) signals recorded during ITs could be useful to gain insight into the underlying
pathophysiology of this condition and to further support treatment decisions. In this study,
two wavelet parameters, wavelet turbulence (WT) and wavelet entropy (WE), were analysed
in order to characterise the variability, irregularity and similarity in spectral content of ICP
signals in hydrocephalus.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (project VA059U13)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Hydrocephalus
Effect of infusion tests on the dynamical properties of intracranial pressure in hydrocephalus
info:eu-repo/semantics/article
http://www.sciencedirect.com
SI
ORIGINAL
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2021-06-23 15:27:40.78
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oai:uvadoc.uva.es:10324/216822021-09-10T09:33:11Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gómez Pilar, Javier
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Corralejo Palacios, Rebeca
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500
Nicolás Alonso, Luis Fernando
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Álvarez González, Daniel
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T07:27:22Z
2016-12-14T07:27:22Z
2016
Medical and Biological Engineering and Computing (2016) 54:1655–1666
0140-0118
http://uvadoc.uva.es/handle/10324/21682
10.1007/s11517-016-1454-4
Producción Científica
Neurofeedback training (NFT) has shown to be promising and useful to rehabilitate cognitive functions. Recently, brain-computer interfaces (BCIs) were used to restore brain plasticity by inducing brain activity with a NFT. In our study, we hypothesized that a NFT with a motor imagery-based BCI (MI-BCI) could enhance cognitive functions related to aging effects. To assess the effectiveness of our MI-BCI application, 63 subjects (older than 60 years) were recruited. This novel application was used by 31 subjects (NFT group). Their Luria neuropsychological test scores were compared with the remaining 32 subjects, who did not perform NFT (control group). Electroencephalogram (EEG) changes measured by relative power (RP) endorsed cognitive potential findings under study: visuospatial, oral language, memory, intellectual and attention functions. Three frequency bands were selected to assess cognitive changes: 12, 18, and 21 Hz (bandwidth 3 Hz). Significant increases (p<0.01) in the RP of these frequency bands were found. Moreover, results from cognitive tests showed significant improvements (p<0.01) in four cognitive functions after performing five NFT sessions: visuospatial, oral language, memory, and intellectual. This established evidence in the association between NFT performed by a MI-BCI and enhanced cognitive performance. Therefore, it could be a novel approach to help elderly people.
Ministerio de Economía y Competitividad (TEC2014-53196)
Junta de Castilla y León (VA059U13)
application/pdf
eng
Springer Verlag
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Brain Computer Interface (BCI)
Neurofeedback training with a motor imagery-based BCI: neurocognitive improvements and EEG changes in the elderly
info:eu-repo/semantics/article
SI
ORIGINAL
GomezPilar_etal_2016_MedicalandBiologicalEngineeringandComputing_post-review.pdf
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2021-09-10 11:33:11.254
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oai:uvadoc.uva.es:10324/216832021-09-10T09:33:28Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Álvarez González, Daniel
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600
Gutiérrez Tobal, Gonzalo César
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Campo Matias, Félix del
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0000-0002-4554-2167
Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T07:43:22Z
2016-12-14T07:43:22Z
2015
Expert Opinion on Therapeutic Patents, 2015, vol. 25:9,p. 971-989
1354-3776
http://uvadoc.uva.es/handle/10324/21683
10.1517/13543776.2015.1054094
Producción Científica
Introduction. Obstructive sleep apnea-hypopnea syndrome (OSAHS) is a major health problem with significant negative effects on the health and quality of life. Continuous positive airway pressure (CPAP) is currently the primary treatment option and it is considered the most effective therapy for OSAHS. Nevertheless, comfort issues due to improper fit to patient’s changing needs and breathing gas leakage limit the patient’s adherence to treatment.
Areas covered. The present patent review describes recent innovations in the treatment of OSAHS related to optimization of the positive pressure delivered to the patient, methods and systems for continuous self-adjusting pressure during inspiration and expiration phases, and techniques for electrical stimulation of nerves and muscles responsible for the airway patency.
Expert opinion. In the last years, CPAP-related inventions have mainly focused on obtaining an optimal self-adjusting pressure according to patient’s needs. Despite intensive research carried out, treatment compliance is still a major issue. Hypoglossal electrical nerve stimulation could be an effective secondary treatment option when CPAP primary therapy fails. Several patents have been granted focused on selective stimulation techniques and parameter optimization of the stimulating pulse waveform. Nevertheless, there remain important issues to address, like effectiveness and adverse events due to improper stimulation.
Ministerio de Economía y Competitividad (TEC2011-22987)
Junta de Castilla y León (VA059U13)
application/pdf
eng
Taylor & Francis
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Airflow limitation
Positive airway pressure and electrical stimulation methods for obstructive sleep apnea treatment: a patent review (2005-2014)
info:eu-repo/semantics/article
SI
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oai:uvadoc.uva.es:10324/217142021-09-10T09:33:59Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Álvarez González, Daniel
45dd2362-f02e-497e-af0c-94810b9c684e
600
Gutiérrez Tobal, Gonzalo César
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500
Alonso Álvarez, María Luz
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600
Terán Santos, Joaquín
575c3df9-8e3f-4789-830a-3d1f9c5d66d4
500
Campo Matias, Félix del
ca3583181f1300f5
500
0000-0002-4554-2167
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-14T12:04:19Z
2016-12-14T12:04:19Z
2014
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2014, v. 2014, p. 1860-3
1557-170X
http://uvadoc.uva.es/handle/10324/21714
10.1109/EMBC.2014.6943972
2014
Producción Científica
Obstructive Sleep Apnea-Hypopnea Syndrome
(OSAHS) is a sleep related breathing disorder that has
important consequences in the health and development of
infants and young children. To enhance the early detection of
OSAHS, we propose a methodology based on automated
analysis of nocturnal blood oxygen saturation (SpO2) from
respiratory polygraphy (RP) at home. A database composed of
50 SpO2 recordings was analyzed. Three signal processing
stages were carried out: (i) feature extraction, where statistical
features and nonlinear measures were computed and combined
with conventional oximetric indexes, (ii) feature selection using
genetic algorithms (GAs), and (iii) feature classification through
logistic regression (LR). Leave-one-out cross-validation (loo-cv)
was applied to assess diagnostic performance. The proposed
method reached 80.8% sensitivity, 79.2% specificity, 80.0%
accuracy and 0.93 area under the ROC curve (AROC), which
improved the performance of single conventional indexes. Our
results suggest that automated analysis of SpO2 recordings from
at-home RP provides essential and complementary information
to assist in OSAHS diagnosis in children.
Ministerio de Economía y Competitividad (TEC2011-22987)
Fundación General CSIC (Proyecto Cero 2011 sobre Envejecimiento)
Obra social de la Caixa y CSIC
Junta de Castilla y León (VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sleep Apnea in Children
Statistical and Nonlinear Analysis of Oximetry from Respiratory Polygraphy to Assist in the Diagnosis of Sleep Apnea in Children
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
ORIGINAL
Alvarez_etal_EMBC_2014_post-review.pdf
Alvarez_etal_EMBC_2014_post-review.pdf
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oai:uvadoc.uva.es:10324/217152021-09-10T09:32:55Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gutiérrez Tobal, Gonzalo César
5aad4a2c-9b6e-4cf1-95ce-8adfd60e25b5
500
Álvarez González, Daniel
45dd2362-f02e-497e-af0c-94810b9c684e
600
Alonso Álvarez, María Luz
3bacbbe3-b507-4ef6-9365-eeeff4705794
600
Terán Santos, Joaquín
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500
Campo Matias, Félix del
ca3583181f1300f5
500
0000-0002-4554-2167
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-14T12:12:26Z
2016-12-14T12:12:26Z
2014
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2014, v. 2014, p. 2298-301
1557-170X)
http://uvadoc.uva.es/handle/10324/21715
10.1109/EMBC.2014.6944079
Producción Científica
This work aims at studying the usefulness of
the spectral information contained in airflow (AF) recordings
in the context of Obstructive Sleep Apnea-Hypopnea
Syndrome (OSAHS) in children. To achieve this goal, we
defined two spectral bands of interest related to the
occurrence of apneas and hypopneas. We characterized these
bands by extracting six common spectral features from each
one. Two out of the 12 features reached higher diagnostic
ability than the 3% oxygen desaturation index (ODI3), a
clinical parameter commonly used as screener for OSAHS.
Additionally, the stepwise logistic regression (SLR) featureselection
algorithm showed that the information contained in
the two bands was complementary, both between them and
with ODI3. Finally, the logistic regression method involving
spectral features from the two bands, as well as ODI3,
achieved high diagnostic performance after a bootstrap
validation procedure (84.6±9.6 sensitivity, 87.2±9.1
specificity, 85.8±5.2 accuracy, and 0.969±0.03 area under
ROC curve). These results suggest that the spectral
information from AF is helpful to detect OSAHS in children
Ministerio de Economía y Competitividad (TEC2011-22987)
Junta de Castilla y León (VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sleep Apnea-Hypopnea Syndrome Diagnosis
Exploring the Spectral Information of Airflow Recordings to Help in Pediatric Obstructive Sleep Apnea-Hypopnea Syndrome Diagnosis
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
ORIGINAL
GutierrezTobal_etal_EMBC_2014_post-review.pdf
GutierrezTobal_etal_EMBC_2014_post-review.pdf
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2021-09-10 11:32:55.787
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oai:uvadoc.uva.es:10324/217182021-09-10T09:32:24Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Álvarez González, Daniel
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Kheirandish Gozal, Leila
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500
Gutiérrez Tobal, Gonzalo César
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T12:18:33Z
2016-12-14T12:18:33Z
2015
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2015, , p. 2800-3
1557-170X
http://uvadoc.uva.es/handle/10324/21718
10.1109/EMBC.2015.7318973
Producción Científica
Childhood obstructive sleep apnea-hypopnea
syndrome (OSAHS) is a highly prevalent condition that
negatively affects health, performance and quality of life of
infants and young children. Early detection and treatment
improves neuropsychological and cognitive deficits linked with
the disease. The aim of this study was to assess the performance
of automated analysis of blood oxygen saturation (SpO2)
recordings as a screening tool for OSAHS. As an initial step,
statistical, spectral and nonlinear features were estimated to
compose an initial feature set. Then, fast correlation-based
filter (FCBF) was applied to search for the optimum subset.
Finally, the discrimination power (OSAHS negative vs. OSAHS
positive) of three pattern recognition algorithms was assessed:
linear discriminant analysis (LDA), quadratic discriminant
analysis (QDA) and logistic regression (LR). Three clinical cutoff
points commonly used in the literature for positive diagnosis
of the disease were applied: apnea-hypopnea index (AHI) of 1,
3 and 5 events per hour (e/h). Our methodology reached 88.6%
accuracy (71.4% sensitivity and 100.0% specificity, 100.0%
positive predictive value, and 84.0% negative predictive value)
in an independent test set using QDA for a clinical cut-off point
of 5 e/h. These results suggest that SpO2 nocturnal recordings
may be used to develop a reliable and efficient screening tool
for childhood OSAHS
Junta de Castilla y León (project VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sleep Apnea-Hypopnea Syndrome
Automated Analysis of Nocturnal Oximetry as Screening Tool for Childhood Obstructive Sleep Apnea-Hypopnea Syndrome
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
ORIGINAL
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oai:uvadoc.uva.es:10324/217192021-06-23T13:27:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gutiérrez Tobal, Gonzalo César
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500
Kheirandish Gozal, Leila
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500
Álvarez González, Daniel
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500
Crespo Senado, Andrea
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Philby, Mona F.
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500
Meelad, Mohammadi
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500
Campo Matias, Félix del
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500
0000-0002-4554-2167
Gozal, David
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T12:34:22Z
2016-12-14T12:34:22Z
2015
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2015, p. 4540-3
1557-170X
http://uvadoc.uva.es/handle/10324/21719
10.1109/EMBC.2015.7319404
Producción Científica
Current study is focused around the potential use
of oximetry to determine the obstructive sleep apnea-hypopnea
syndrome (OSAHS) severity in children. Single-channel SpO2
recordings from 176 children were divided into three severity
groups according to the apnea-hypopnea index (AHI): AHI<1
events per hour (e/h), 1≤AHI<5 e/h, and AHI ≥5 e/h. Spectral
analysis was conducted to define and characterize a frequency
band of interest in SpO2. Then we combined the spectral data
with the 3% oxygen desaturation index (ODI3) by means of a
multi-layer perceptron (MLP) neural network, in order to
classify children into one of the three OSAHS severity groups.
Following our MLP multiclass approach, a diagnostic protocol
with capability to reduce the need of polysomnography tests by
46% could be derived. Moreover, our proposal can be also
evaluated, in a binary classification task for two common AHI
diagnostic cutoffs (AHI = 1 e/h and AHI= 5 e/h). High
diagnostic ability was reached in both cases (84.7% and 85.8%
accuracy, respectively) outperforming the clinical variable
ODI3 as well as other measures reported in recent studies.
These results suggest that the information contained in SpO2
could be helpful in pediatric OSAHS severity detection.
Junta de Castilla y León (project VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sleep Apnea severity in Children
Analysis and Classification of Oximetry Recordings to Predict Obstructive Sleep Apnea Severity in Children
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
ORIGINAL
GutierrezTobal_etal_EMBC_2015_post-review.pdf
GutierrezTobal_etal_EMBC_2015_post-review.pdf
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2021-06-23 15:27:37.394
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/217222021-06-23T13:27:44Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gómez Peña, Carlos
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0000-0002-9488-0605
Poza Crespo, Jesús
c33645a6dc1b0f93
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0000-0001-8577-9559
Gómez Pilar, Javier
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Bachiller Matarranz, Alejandro
c189a28b-a277-4b38-bd14-6652ea916bc6
500
Juan Cruz, Celia
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500
Tola Arribas, Miguel Ángel
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500
0000-0003-4105-0998
Carreres Rodríguez, Alicia
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500
Cano, Mónica
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Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T12:43:00Z
2016-12-14T12:43:00Z
2016
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2016, p. 2830 - 2833
1557-170X
http://uvadoc.uva.es/handle/10324/21722
Producción Científica
The aim of this pilot study was to analyze
spontaneous electroencephalography (EEG) activity in
Alzheimer’s disease (AD) by means of Cross-Sample Entropy
(Cross-SampEn) and two local measures derived from graph
theory: clustering coefficient (CC) and characteristic path
length (PL). Five minutes of EEG activity were recorded from
37 patients with dementia due to AD and 29 elderly controls.
Our results showed that Cross-SampEn values were lower in
the AD group than in the control one for all the interactions
among EEG channels. This finding indicates that EEG activity
in AD is characterized by a lower statistical dissimilarity
among channels. Significant differences were found mainly for
fronto-central interactions (p < 0.01, permutation test).
Additionally, the application of graph theory measures
revealed diverse neural network changes, i.e. lower CC and
higher PL values in AD group, leading to a less efficient brain
organization. This study suggests the usefulness of our
approach to provide further insights into the underlying brain
dynamics associated with AD.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (proyecto VA037U16 y BIO/VA08/15)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Entropy
Analysis of Spontaneous EEG Activity in Alzheimer’s Disease Using Cross-Sample Entropy and Graph Theory
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
LICENSE
license.txt
license.txt
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Gomez_etal_EMBC_2016_post-review.pdf
Gomez_etal_EMBC_2016_post-review.pdf
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oai:uvadoc.uva.es:10324/21722
2021-06-23 15:27:44.778
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/217252021-06-23T13:27:27Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gómez Pilar, Javier
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Bachiller Matarranz, Alejandro
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Núñez Novo, Pablo
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500
Poza Crespo, Jesús
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0000-0001-8577-9559
Gómez Peña, Carlos
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0000-0002-9488-0605
Lubeiro Juárez, Alba
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Molina Rodríguez, Vicente
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0000-0003-2457-2487
Hornero Sánchez, Roberto
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0000-0001-9915-2570
2016-12-14T12:52:14Z
2016-12-14T12:52:14Z
2016
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2016, p. 700 - 703
1557-170X
http://uvadoc.uva.es/handle/10324/21725
10.1109/EMBC.2016.7590798
Producción Científica
The aim of this study was to assess brain complexity dynamics in schizophrenia (SCH) patients during an auditory oddball task. For that task, we applied a novel graph measure based on the balance of the node weighs distribution. Previous studies applied complexity parameters that were strongly dependent on network topology. This fact could bias the results besides being necessary correction techniques as surrogating process. In the present study, we applied a novel graph complexity measure from the information theory: Shannon Graph Complexity (SGC). Complexity patterns form electroencephalographic recordings of 20 healthy controls and 20 SCH patients during an auditory oddball task were analyzed. Results showed a significantly more pronounced decrease of SGC for controls than for SCH patients during the cognitive task. These findings suggest an important change in the brain configuration towards more balanced networks, mainly in the connections related to long-range interactions. Since these changes are significantly more pronounced in controls, it implies a deficit in the neural network reorganization in SCH patients. In addition, SGC showed a suitable discrimination ability using a leave-one-out cross-validation: 0.725 accuracy and 0.752 area under receiver operating characteristics curve. The novel complexity measure proposed in this study demonstrated to be independent of network topology and, therefore, it complements traditional graph measures to characterize brain networks.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Schizophrenia
Novel Measure of the Weigh Distribution Balance on the Brain Network: Graph Complexity Applied to Schizophrenia
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
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GomezPilar_etal_EMBC_2016_post-review.pdf
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2021-06-23 15:27:27.09
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oai:uvadoc.uva.es:10324/217262021-06-23T13:27:47Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Juan Cruz, Celia
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500
Gómez Peña, Carlos
c15f35f90dbac93e
500
0000-0002-9488-0605
Poza Crespo, Jesús
c33645a6dc1b0f93
500
0000-0001-8577-9559
Fernández, Alberto
826f4ee5-c3ed-4a1e-9b25-8cd17102b0db
500
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-14T12:59:10Z
2016-12-14T12:59:10Z
2016
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2016, p. 724 - 727
1557-170X
http://uvadoc.uva.es/handle/10324/21726
10.1109/EMBC.2016.7590804
Producción Científica
The aim of this study was to analyze resting-state
magnetoencephalography (MEG) activity in Alzheimer’s
disease (AD) by means of Granger Causality (GC), an effective
connectivity measure that provides an estimation of the
information flow between brain regions. For this task, five
minutes of MEG recordings were acquired with a 148-channel
whole-head magnetometer from 36 AD patients and 26 healthy
controls. Abnormalities in AD connectivity were found in the
five typical frequency bands: delta (δ, 1-4 Hz), theta (θ, 4-8 Hz),
alpha (α, 8-13 Hz), beta (β, 13-30 Hz), and gamma (γ, 30-65
Hz). Noteworthy increments in delta band and decrements in
beta and gamma bands revealed disrupted connections in AD
brain activity. Our analyses suggest that GC may be useful to
characterize the brain impairment in AD.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (VA059U13 y BIO/VA08/15)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Alzheimer, Enfermedad de
Analysis of Magnetoencephalography Signals from Alzheimer’s Disease Patients Using Granger Causality
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
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oai:uvadoc.uva.es:10324/217442021-06-23T13:27:32Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Núñez Novo, Pablo
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500
Poza Crespo, Jesús
c33645a6dc1b0f93
500
0000-0001-8577-9559
Gómez Pilar, Javier
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500
Bachiller Matarranz, Alejandro
c189a28b-a277-4b38-bd14-6652ea916bc6
500
Gómez Peña, Carlos
c15f35f90dbac93e
500
0000-0002-9488-0605
Lubeiro Juárez, Alba
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500
Molina Rodríguez, Vicente
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500
0000-0003-2457-2487
Hornero Sánchez, Roberto
f6af2dd4a94089d7
500
0000-0001-9915-2570
2016-12-15T06:54:56Z
2016-12-15T06:54:56Z
2016
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2016, p. 3724 - 3727
1557-170X
http://uvadoc.uva.es/handle/10324/21744
10.1109/EMBC.2016.7591537
Producción Científica
The aim of this study was to characterize brain
dynamics during an auditory oddball task. For this purpose, a
measure of the non-stationarity of a given time-frequency
representation (TFR) was applied to electroencephalographic
(EEG) signals. EEG activity was acquired from 20
schizophrenic (SCH) patients and 20 healthy controls while
they underwent a three-stimulus auditory oddball task. The
Degree of Stationarity (DS), a measure of the non-stationarity
of the TFR, was computed using the continuous wavelet
transform. DS was calculated for both the baseline [-300 0] ms
and active task [150 550] ms windows of a P300 auditory
oddball task. Results showed a statistically significant increase
(p<0.05) in non-stationarity for controls during the cognitive
task in the central region, while less widespread statistically
significant differences were obtained for SCH patients,
especially in the beta-2 and gamma bands. Our findings
support the relevance of DS as a means to study cerebral
processing in SCH. Furthermore, the lack of statistically
significant changes in DS for SCH patients suggests an
abnormal reorganization of neural dynamics during an oddball
task.
Ministerio de Economía y Competitividad (TEC2014-53196-R)
Junta de Castilla y León (VA059U13)
application/pdf
eng
IEEE Conference Publications
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Schizophrenia
Analysis of the Non-stationarity of Neural Activity during an Auditory Oddball Task in Schizophrenia
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/servlet/opac?punumber=1000269
SI
ORIGINAL
Nuñez_etal_EMBC_2016_post-review.pdf
Nuñez_etal_EMBC_2016_post-review.pdf
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2021-06-23 15:27:32.871
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oai:uvadoc.uva.es:10324/239282021-06-23T13:27:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Dante, Roberto C.
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Chamorro Posada, Pedro
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0000-0002-0199-0558
Vázquez Cabo, José
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Rubiños López, Óscar
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Sánchez Arévalo, Francisco Manuel
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Huerta, Lázaro
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Martín Ramos, Pablo
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Lartundo Rojas, Luis
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Ávila Vega, Carlos Fabián
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Rivera Tapia, Edgar David
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Fajardo Pruna, Cristian
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Ávila Vega, Álvaro J.
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Solorza Feria, Omar
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2017-06-23T15:40:30Z
2017-06-23T15:40:30Z
2017
Carbon, Septiembre 2017, vol. 121, 368–379
http://uvadoc.uva.es/handle/10324/23928
https://doi.org/10.1016/j.carbon.2017.05.098
Nitrogen-carbon graphite-like semiconductor synthesized from uric acid
A new carbon-nitrogen organic semiconductor has been synthesized by pyrolysis of uric acid. This layered carbon-nitrogen material contains imidazole-, pyridine (naphthyridine)- and graphitic-like nitrogen, as evinced by infrared and X-ray photoelectron spectroscopies. Quantum chemistry calculations support that it would consist of a 2D polymeric material held together by hydrogen bonds. Layers are stacked with an interplanar distance between 3.30 and 3.36 Å, as in graphite and coke. Terahertz spectroscopy shows a behavior similar to that of amorphous carbons, such as coke, with non-interacting layers. This material features substantial differences from polymeric carbon nitride, with some characteristics closer to those of nitrogen-doped graphene, in spite of its higher nitrogen content. The direct optical band gap, dependent on the polycondensation temperature, ranges from 2.10 to 2.32 eV. Although in general the degree of crystallinity is low, the material synthesized at 600 °C is composed of globular hollow particles, in which spots with a certain degree of crystallinity can be found.
Junta de Castilla y León Grant VA089U16
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Elsevier
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Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 International
Nitrogen-carbon graphite-like semiconductor synthesized from uric acid
info:eu-repo/semantics/article
http://www.sciencedirect.com/science/article/pii/S000862231730564X
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oai:uvadoc.uva.es:10324/239292021-06-23T13:27:54Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Doménech, David
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Chamorro Posada, Pedro
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0000-0002-0199-0558
Fraile Peláez, Francisco Javier
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Erro, María José
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Tainta, S.
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Muriel, Miguel
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Baños, Rocío
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Bolten, J.
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Kleinjans, H.
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2017-06-23T15:48:03Z
2017-06-23T15:48:03Z
2017
Journal of Lightwave Technology, julio 2017, vol. 35, p. 2943 - 2947
http://uvadoc.uva.es/handle/10324/23929
10.1109/JLT.2017.2707478
Characterization of Microring Filters for Differential Group Delay Applications
Producción Científica
The longitudinal offset technique permits to improve the accuracy of the coupling coefficients of integrated directional couplers and provides designs that can be easily implemented with current fabrication tolerances. In this paper, we address the additional degree of freedom offered by this technology in order to tailor the differential group delay in coupled-resonator optical filters. We present the characterization of several devices exploiting this feature and we discuss their potential applications.
Junta de Castilla y León Regional Grant VA089U16
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IEEE
info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
IEEE
Attribution-NonCommercial-NoDerivatives 4.0 International
Characterization of Microring Filters for Differential Group Delay Applications
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/document/7932853/
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oai:uvadoc.uva.es:10324/239302021-06-23T13:27:55Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Chamorro Posada, Pedro
296bb9bd3416d3ff
500
0000-0002-0199-0558
2017-06-23T16:04:15Z
2017-06-23T16:04:15Z
2017
Chaos, Solitons & Fractals, octubre 2016, vol. 91, p. 562-572
http://uvadoc.uva.es/handle/10324/23930
https://doi.org/10.1016/j.chaos.2016.08.002
Producción Científica
The fractal structure of real world objects is often analyzed using digital images. In this context, the compression fractal dimension is put forward. It provides a simple method for the direct estimation of the dimension of fractals stored as digital image files. The computational scheme can be implemented using readily available free software. Its simplicity also makes it very interesting for introductory elaborations of basic concepts of fractal geometry, complexity, and information theory. A test of the computational scheme using limited-quality images of well-defined fractal sets obtained from the Internet and free software has been performed. Also, a systematic evaluation of the proposed method using computer generated images of the Weierstrass cosine function shows an accuracy comparable to those of the methods most commonly used to estimate the dimension of fractal data sequences applied to the same test problem.
Junta de Castilla y León Regional Grant VA089U16
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Elsevier
info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 International
A simple method for estimating the fractal dimension from digital images: The compression dimension
info:eu-repo/semantics/article
http://www.sciencedirect.com/science/article/pii/S0960077916302399
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oai:uvadoc.uva.es:10324/248392021-06-23T13:28:04Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
Pozzi, Francesca
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500
Hernández Leo, Davinia
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500
Prieto, Luis P.
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500
Persico, Donatella
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500
Villagrá Sobrino, Sara Lorena
e4d859ee08d929c8
500
0000-0003-2516-0492
2017-07-31T09:06:06Z
2017-07-31T09:06:06Z
2017
Asensio-Pérez, J. I., Dimitriadis, Y., Pozzi, F., Hernández-Leo, D., Prieto, L. P., Persico, D., & Villagrá-Sobrino, S. L. Towards teaching as design: Exploring the interplay between full-lifecycle learning design tooling and Teacher Professional Development. Computers & Education. 114:92-116, 2017.
http://uvadoc.uva.es/handle/10324/24839
https://doi.org/10.1016/j.compedu.2017.06.011
Producción Científica
Recent research suggests that training teachers as learning designers helps promote technology enhanced educational innovations. However, little attention has been paid so far to the interplay between the effectiveness of Teacher Professional Development (TPD) instructional models promoting the role of teachers as designers and the capabilities (and pitfalls) of the heterogeneous landscape of available Learning Design (LD) tooling employed to support such TPD. This paper describes a mixed method study that explores the use of a novel Integrated Learning Design Environment (ILDE) for supporting a TPD program on Information and Communication Technologies (ICT) and Collaborative Learning (CL). 36 Adult Education (AE) and Higher Education (HE) in-service teachers, with little experience on both CL and ICT integration, participated in a study encompassing training workshops and follow-up fulllifecycle learning design processes (from initial conceptualization to implementation with a total of 176 students). The findings from our interpretive study showcase the benefits (and required effort) derived from the use of an integrated platform that guides teachers along the main phases of the learning design process, and that automates certain technological setup tasks needed for the classroom enactment. The study also highlights the need for adaptation of the TPD instructional model to the learning curve associated to the LD tooling, and explores its impact on the attitude of teachers towards future adoption of LD practices.
Ministerio de Economía, Industria y Competitividad (Projects TIN2011-28308-C03-02, TIN2014-53199-C3-2-R, TIN2014- 53199-C3-3-R, MDM-2015-0502)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14 and VA082U16)
European Union (project 531262-LLP-2012-ES-KA3-KA3MP)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje
Entornos de aprendizaje
Towards teaching as design: Exploring the interplay between full-lifecycle learning design tooling and Teacher Professional Development
info:eu-repo/semantics/article
http://www.sciencedirect.com/science/article/pii/S0360131517301471
SI
THUMBNAIL
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2021-06-23 15:28:04.489
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/248402021-06-23T13:28:06Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
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500
Gallego Lema, Vanesa
8bd2585d-93e0-4035-ba52-bf3123e58aa3
500
Arribas Cubero, Higinio Francisco
11955f12c21e2613
500
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
2017-07-31T09:17:23Z
2017-07-31T09:17:23Z
2017
Muñoz-Cristóbal, J.A., Gallego-Lema, V., Arribas-Cubero, H.F., Martínez-Monés, A., Asensio-Pérez, J.I. Using virtual learning environments in bricolage mode for orchestrating learning situations across physical and virtual spaces. Computers & Education. 109:233-252, 2017.
http://uvadoc.uva.es/handle/10324/24840
https://doi.org/10.1016/j.compedu.2017.03.004
Producción Científica
Teachers usually implement their pedagogical ideas in Virtual Learning Environments (VLEs) in a continuous refinement approach also known as “bricolage”. Recently, different proposals have enabled the ubiquitous access to VLEs, thus extending the bricolage mode of operation to other learning spaces. However, such proposals tend to present several limitations for teachers to orchestrate learning situations conducted across different physical and virtual spaces. This paper presents an evaluation study that involved the across-spaces usage of Moodle in bricolage mode and learning buckets (configurable containers of learning artifacts) in multiple learning situations spanning five months in a course on Physical Education in the Natural Environment for pre-service teachers. The study followed a responsive evaluation model, in which we conducted an anticipatory data reduction using an existing orchestration framework (called “5 + 3 aspects”) for structuring data gathering and analysis. The results showed that learning buckets helped the teachers in the multiple aspects of orchestration, overcoming the limitations of alternative approaches in some specific orchestration aspects: helping the involved teachers to connect different physical and physical spaces, while supporting technologies and activities of their everyday practice, and transferring part of the orchestration load from teachers to students. The results also suggested lines of future improvement, including the awareness of outdoor activities.
Ministerio de Economía, Industria y Competitividad (Project TIN2011-28308-C03-02 and TIN2014-53199-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14 and VA082U16)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje
Entornos de aprendizaje
Realidad virtual
Using virtual learning environments in bricolage mode for orchestrating learning situations across physical and virtual spaces
info:eu-repo/semantics/article
http://www.sciencedirect.com/science/article/pii/S0360131517300520
SI
THUMBNAIL
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2021-06-23 15:28:06.08
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/248412021-06-23T13:28:07Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
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500
Asensio Pérez, Juan Ignacio
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0000-0002-1114-2819
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Prieto, Luis P.
5e361ddc-8ad9-4bed-8ab8-ff9b2f6079ab
500
Jorrín Abellán, Iván Manuel
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500
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
2017-07-31T09:45:36Z
2017-07-31T09:45:36Z
2017
Muñoz-Cristóbal, J.A., Asensio-Pérez, J.I., Martínez-Monés, A., Prieto-Santos, L.P., Jorrín-Abellán, I.M., Dimitriadis, Y. Learning Buckets: Helping Teachers Introduce Flexibility in the Management of Learning Artifacts Across Spaces. IEEE Transactions on Learning Technologies. In press. , 2017.
http://uvadoc.uva.es/handle/10324/24841
https://doi.org/10.1109/TLT.2017.2693150
Producción Científica
echnology offers rich opportunities for learning across different physical and virtual spaces. However, most of current across-spaces proposals are either highly teacher-centered, inflexible in the students’ self-management of learning artifacts during the enactment, or allow the teacher little/no control of such students’ management of artifacts. Moreover, these proposals tend to be disconnected from the practices and tools that are usual in the classroom. How can we achieve a middle ground between keeping the teacher in control of across-spaces situations and, at the same time, providing students with a degree of flexibility to manage learning artifacts? Aiming to address such challenge we propose the notion of learning bucket, and the Bucket-Server, a system implementing such notion. A learning bucket is a container of learning artifacts which are generated and/or accessed across-spaces by the students during the enactment, according to constraints configured by teachers at design time. The responsive evaluation conducted, based on a feature analysis and a pilot study with experts, suggests that learning buckets can help evolve from teacher- to student-centered approaches, while maintaining the teacher in control of students’ actions. The evaluation also indicates that the Bucket-Server surpasses the support provided by alternative proposals to across-spaces learning.
Ministerio de Economía, Industria y Competitividad (Project TIN2014- 53199-C3-2- R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA277U14)
application/pdf
eng
Institute of Electrical and Electronics Engineers (IEEE)
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Realidad virtual
Educación
Computación ubicua
Learning Buckets: Helping Teachers Introduce Flexibility in the Management of Learning Artifacts Across Spaces
info:eu-repo/semantics/article
http://ieeexplore.ieee.org/document/7896594/
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2021-06-23 15:28:07.529
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oai:uvadoc.uva.es:10324/248422021-10-18T11:46:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
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600
Rodríguez Triana, María Jesús
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500
Gallego Lema, Vanesa
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500
Arribas Cubero, Higinio Francisco
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500
Asensio Pérez, Juan Ignacio
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500
0000-0002-1114-2819
Martínez Monés, Alejandra
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500
0000-0003-3201-0345
2017-07-31T09:59:58Z
2017-07-31T09:59:58Z
2017
Muñoz-Cristóbal, J.A., Rodríguez-Triana, M.J., Gallego-Lema, V., Arribas-Cubero, H.F., Asensio-Pérez, J.I., Martínez-Monés, A. Monitoring for awareness and reflection in ubiquitous learning environments. International Journal of Human-Computer Interaction. In press., 2017
http://uvadoc.uva.es/handle/10324/24842
10.1080/10447318.2017.1331536
Producción Científica
Despite the educational affordances that ubiquitous learning has shown, it is still hampered by several orchestration difficulties. One of these difficulties is that teachers lose awareness of what the students perform across the multiple technologies and spaces involved. Monitoring can help in such awareness, and it has been highly explored in face-to-face and blended learning. Nevertheless, in ubiquitous learning environments monitoring has been usually limited to activities taking place in a specific type of space (e.g., outdoors). In this paper we propose a monitoring system for ubiquitous learning, which was evaluated in three authentic studies, supporting the participants in the affordable monitoring of learning situations involving web, augmented-physical, and 3D virtual world spaces. The work carried out also helped identify a set of guidelines, which are expected to be useful for researchers and technology developers aiming to provide participants’ support in ubiquitous learning environments.
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eng
Taylor & Francis
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Realidad virtual
Aprendizaje ubicuo
Monitoring for awareness and reflection in ubiquitous learning environments
info:eu-repo/semantics/article
http://www.tandfonline.com/doi/abs/10.1080/10447318.2017.1331536
SI
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oai:uvadoc.uva.es:10324/24842
2021-10-18 13:46:17.582
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/249022021-06-23T13:28:10Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ruiz Calleja, Adolfo
60d61a86a69e7fb9
500
Asensio Pérez, Juan Ignacio
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0000-0002-1114-2819
Vega Gorgojo, Guillermo
a1d3b79ce8bacd3c
500
0000-0002-6916-9213
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Bote Lorenzo, Miguel Luis
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500
0000-0002-8825-0412
Alario Hoyos, Carlos
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2017-08-18T08:17:33Z
2017-08-18T08:17:33Z
2017
Ruiz-Calleja, A., Asensio-Pérez, J.I., Vega-Gorgojo, G., Gómez-Sánchez, E., Bote-Lorenzo, M.L., Alario-Hoyos, C. Enriching the Web of Data with educational information using We-Share. The International Review of Research in Open and Distributed Learning. 18(1):247-265, February 2017
1492-3831
http://uvadoc.uva.es/handle/10324/24902
http://dx.doi.org/10.19173/irrodl.v18i1.2633
International Review of Research in Open and Distributed Learning
Producción Científica
This paper presents We-Share, a social annotation application that enables educators to publish and retrieve information about educational ICT tools. As a distinctive characteristic, We-Share provides educators data about educational tools already available on the Web of Data while allowing them to enrich such data with their experience using technology in the classroom. We-Share evaluation entails an empirical study where 23 educators enriched tool descriptions available on the Web of Data out of their own experience. The results suggest that experiential annotations published by educators using We-Share improve the satisfaction and confidence of other educators when discovering and selecting ICT tools. Further, most educators found We-Share an easy-to-use application suitable to share and retrieve information about educational ICT tools.
application/pdf
eng
Athabasca University Press
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Web social
Tecnología educativa
TIC
Herramientas educaticas
Enriching the Web of Data with educational information using We-Share
info:eu-repo/semantics/article
http://www.irrodl.org/index.php/irrodl/article/view/2633/4025
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2021-06-23 15:28:10.249
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/249032021-06-23T13:27:56Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Martínez Maldonado, Roberto
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Goodyear, Peter
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Carvalho, Lucila
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Thompson, Kate
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Hernández Leo, Davinia
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Dimitriadis Damoulis, Ioannis
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Prieto Santos, Luis Pablo
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Wardak, Dewa
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2017-08-18T08:32:57Z
2017-08-18T08:32:57Z
2017
Martínez-Maldonado, R., Goodyear, P., Carvalho, L., Thompson, K., Hernández-Leo, D., Dimitriadis, Y., Prieto-Santos, L.P., Wardak, D. Supporting Collaborative Design Activity in a Multi-User Digital Design Ecology. Computers in Human Behavior. 71:327-342, February 2017.
http://uvadoc.uva.es/handle/10324/24903
https://doi.org/10.1016/j.chb.2017.01.055
Computers in Human Behavior.
Producción Científica
Across a broad range of design professions, there has been extensive research on design practices and considerable progress in creating new computer-based systems that support design work. Our research is focused on educational/instructional design for students' learning. In this sub-field, progress has been more limited. In particular, neither research nor systems development have paid much attention to the fact that design is becoming a more collaborative endeavor. This paper reports the latest research outcomes from R&D in the Educational Design Studio (EDS), a facility developed iteratively over four years to support and understand collaborative, real-time, co-present design work. The EDS serves to (i) enhance our scientific understanding of design processes and design cognition and (ii) provide insights into how designers' work can be improved through appropriate technological support. In the study presented here, we introduced a complex, multi-user, digital design tool into the existing ecology of tools and resources available in the EDS. We analysed the activity of four pairs of ‘teacher-designers’ during a design task. We identified different behaviors - in reconfiguring the task, the working methods and toolset usage. Our data provide new insights about the affordances of different digital and analogue design surfaces used in the Studio.
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eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje
Diseño digital
Supporting Collaborative Design Activity in a Multi-User Digital Design Ecology
info:eu-repo/semantics/article
http://www.sciencedirect.com/science/article/pii/S0747563217300675
SI
CC-LICENSE
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2021-06-23 15:27:56.881
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/249042021-06-23T13:27:59Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gallego Lema, Vanesa
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500
Muñoz Cristóbal, Juan Alberto
8c6b2e45-6dfb-4349-a028-36e2568922ab
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Arribas Cubero, Higinio Francisco
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500
Rubia Avi, Bartolomé
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0000-0002-4963-4552
2017-08-18T08:52:41Z
2017-08-18T08:52:41Z
2017
Gallego-Lema, V., Muñoz-Cristóbal, J.A., Arribas-Cubero, H.F., Rubia-Avi, B. Orienteering in the natural environment: Ubiquitous learning through the use of technology. Movimento (ESEFID/UFRGS). 23(2):755-770, 2017
1982-8918
http://uvadoc.uva.es/handle/10324/24904
Movimento
Producción Científica
Nuevos estudios emergen en el área de Educación Física, evidenciando que
la tecnología puede potenciar el proceso educativo. Este artículo muestra un proceso
formativo de los contenidos de orientación como actividad física en el medio natural con
apoyo tecnológico. La investigación permitió analizar, siguiendo una metodología de
estudio de caso con 65 estudiantes universitarios y un docente, cómo el aprendizaje ubicuo
a través del uso de herramientas tecnológicas (Realidad Aumentada, geolocalización,
etc.), apoyó el aprendizaje de la orientación en el medio natural. Entre otros resultados,
el aprendizaje ubicuo estimuló el proceso de aprendizaje en distintos espacios físicos
y virtuales, mejoró la adquisición de contenidos de orientación, la competencia digital,
un aprendizaje en distintos momentos, etc. Aparte de estas potencialidades, también se
identificaron problemáticas durante el proceso, como la tensión de que la tecnología no
eclipsara el contacto con el medio natural, la ausencia de red, y otras.
New studies on Physical Education are appearing, showing that technology can
enhance the educational process. This article describes a technology-supported learning
process on orienteering as a physical activity in the natural environment. By using a case
study with 65 university students and one teacher, the research allowed us to analyze
how ubiquitous learning, through the use of technological tools (Augmented Reality,
geolocation, etc.) supported learning of orienteering in the natural environment. Among
other findings, ubiquitous learning stimulated the learning process in different physical and
virtual spaces, better acquisition of orienteering contents, digital competence, and learning
at different times. Apart from these potentialities, some difficulties also emerged during
the process, such as concerns about the dangers of technology overshadowing students’
connections with the natural environment, lack of internet coverage, and others
application/pdf
spa
Universidade Federal do Rio Grande do Sul, Brasil
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Educación superior
Tecnología educativa
La orientación en el medio natural: aprendizaje ubicuo mediante el uso de tecnología
A orientação no ambiente natural: aprendizagem ubíqua através do uso de tecnologia
Orienteering in the natural environment: ubiquitous learning through the use of technology
info:eu-repo/semantics/article
http://www.seer.ufrgs.br/Movimento
SI
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oai:uvadoc.uva.es:10324/249062021-06-23T13:28:02Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Gallego Lema, Vanesa
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500
Muñoz Cristóbal, Juan Alberto
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500
Arribas Cubero, Higinio Francisco
11955f12c21e2613
500
Rubia Avi, Bartolomé
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0000-0002-4963-4552
2017-08-18T09:03:54Z
2017-08-18T09:03:54Z
2017
Gallego-Lema, V., Muñoz-Cristóbal, J.A., Arribas-Cubero, H.F., Rubia-Avi, B. Recursos tecnológicos para el aula de Educación Física en el Medio Natural. Revista Tándem: Didáctica de la Educación Física. In press. , 2017.
2014-4768
http://uvadoc.uva.es/handle/10324/24906
Producción Científica
En el artículo presentamos diferentes herramientas tecnológicas utilizadas como recurso en el desarrollo de actividades físicas en el medio natural. Para ello, ofrecemos una descripción, las limitaciones encontradas así como el uso didáctico de aplicaciones basadas en Realidad Aumentada, Geoposición, Redes Sociales y otras.
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Attribution-NonCommercial-NoDerivatives 4.0 International
Educación física
TICs
Recursos tecnológicos para el aula de Educación Física en el Medio Natural
info:eu-repo/semantics/article
http://tandem.grao.com/revistas/tandem
SI
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Recursos-tecnologicos-aula-tandem_fina_final.pdf
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2021-06-23 15:28:02.03
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oai:uvadoc.uva.es:10324/249132021-06-23T13:28:03Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Bordiés López, Osmel
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Dimitriadis Damoulis, Ioannis
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0000-0001-7275-2242
2017-08-18T10:51:27Z
2017-08-18T10:51:27Z
2016
Bordiés-López, O., Dimitriadis, Y. Exploring Teachers Perceptions on Modeling Effort Demanded by CSCL Designs with Explicit Artifact Flow Support. Journal of Universal Computer Science. 22(10):1398-1417, October 2016.
http://uvadoc.uva.es/handle/10324/24913
10.3217/jucs-022-10-1398
Producción Científica
Artifact flow represents an important aspect of teaching/learning processes, especially in CSCL situations in which complex relationships may be found. However, explicit modeling of CSCL processes with artifact flow may increase the cognitive load and associated effort of the teachers-designers and therefore decrease the efficiency of the design process. The empirical study, reported in this paper and grounded on mixed methods, provides evidence of the effort overload when teachers are involved in designing CSCL situations in a controlled environment. The results of the study illustrate the problem through the subjective perception of the participating teachers, complemented with objective parameters, such as time consumed, errors committed, uncertainty and objective complexity metrics.
Ministerio de Economía, Industria y Competitividad (Project Project TIN2014-53199-C3- 2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14)
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA082U16)
application/pdf
eng
Graz University of Technology, Institut für Informationssysteme und Computer Medien (IICM)
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Nuevas tecnologías
Aprendizaje colaborativo
Exploring Teachers Perceptions on Modeling Effort Demanded by CSCL Designs with Explicit Artifact Flow Support
info:eu-repo/semantics/article
http://www.jucs.org/jucs_22_10/exploring_teachers_perceptions_on
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/259152021-06-23T13:28:11Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Rodríguez, Ricardo J.
bf8cbc73-e84d-481b-86a4-fb9c71b7c1b6
500
García Escartín, Juan Carlos
3dcb87f63ca3bc96
500
0000-0002-9813-5004
Sanchez Ballabriga, Víctor
9bba1b9d-59e2-4908-b4ad-7248c020f018
500
2017-09-25T16:53:01Z
2017-09-25T16:53:01Z
2017
http://dx.doi.org/10.1049/iet-ifs.2017.0299
http://uvadoc.uva.es/handle/10324/25915
http://dx.doi.org/10.1049/iet-ifs.2017.0299
The theft of personal information to assume the identity of a person is a common threat.
Individual criminals, terrorists, or crime rings normally do it to commit fraud or other felonies.
Recently, the Spanish identity card, which provides enough information to hire on-line products such as mortgages or loans, was updated to incorporate a Near Field Communication (NFC) chip as electronic passports do. This contactless interface brings a new attack vector for these criminals, who might take advantage of the RFID communication to secretly steal personal information. In this paper, we assess the security of contactless Spanish identity card against identity theft. In particular, we evaluated the resistance of one of the contactless access protocol against brute-force attacks and found that no defenses were incorporated. We suggest how to avoid brute-force attacks. Furthermore, we also analyzed the pseudo-random number generator within the card, which passed all performed tests with good results.
MINECO CyCriSec (TIN2014-58457-R).
University of Zaragoza and Centro Universitario de la Defensa UZCUD2016-TEC-06.
Project TEC2015-69665-R (MINECO/FEDER, UE).
application/pdf
eng
IET
info:eu-repo/semantics/restrictedAccess
Institution of Engineering and Technology
Security Assessment of the Spanish Contactless Identity Card
info:eu-repo/semantics/article
SI
THUMBNAIL
SecurityAssessmentDNIe.pdf.jpg
SecurityAssessmentDNIe.pdf.jpg
IM Thumbnail
image/jpeg
3433
https://uvadoc.uva.es/bitstream/10324/25915/3/SecurityAssessmentDNIe.pdf.jpg
df1a691543ad648a87e8b5870c679b29
MD5
3
LICENSE
license.txt
license.txt
text/plain
4250
https://uvadoc.uva.es/bitstream/10324/25915/2/license.txt
909e634ba52becf192e4e9b4bcde7863
MD5
2
ORIGINAL
SecurityAssessmentDNIe.pdf
SecurityAssessmentDNIe.pdf
application/pdf
1982392
https://uvadoc.uva.es/bitstream/10324/25915/1/SecurityAssessmentDNIe.pdf
3a3b41f992de12e94236dd3598363715
MD5
1
10324/25915
oai:uvadoc.uva.es:10324/25915
2021-06-23 15:28:11.988
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/259632021-06-23T13:28:14Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sánchez Curto, Julio
80cbf525b1c2b582
500
Chamorro Posada, Pedro
296bb9bd3416d3ff
500
0000-0002-0199-0558
2017-09-28T09:19:47Z
2017-09-28T09:19:47Z
2016
Phys. Rev. A 93, 033826 (2016)
http://uvadoc.uva.es/handle/10324/25963
Nonlinear interfaces separating two diffusive Kerr-type media exhibit dual switching between total internal reflection and transmission. This property is found within a weakly nonlocal regime when both a nonparaxial treatment of the problem and a full two-dimensional model for carrier diffusion are assumed. The theoretical model is shown to predict an effective cubic-quintic nonlinearity with competing terms that produces such property. The validity of the analysis is contrasted with a full set of numerical simulations.
application/pdf
eng
American Physical Society
info:eu-repo/semantics/openAccess
Helmholtz solitons in diffusive Kerr-type media
info:eu-repo/semantics/article
SI
THUMBNAIL
AL11176_2ndproofs.pdf.jpg
AL11176_2ndproofs.pdf.jpg
IM Thumbnail
image/jpeg
2203
https://uvadoc.uva.es/bitstream/10324/25963/3/AL11176_2ndproofs.pdf.jpg
85f39a40fdc23d99be543c4441d32c34
MD5
3
ORIGINAL
AL11176_2ndproofs.pdf
AL11176_2ndproofs.pdf
application/pdf
5629500
https://uvadoc.uva.es/bitstream/10324/25963/1/AL11176_2ndproofs.pdf
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MD5
1
LICENSE
license.txt
license.txt
text/plain
4250
https://uvadoc.uva.es/bitstream/10324/25963/2/license.txt
909e634ba52becf192e4e9b4bcde7863
MD5
2
10324/25963
oai:uvadoc.uva.es:10324/25963
2021-06-23 15:28:14.753
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/313742021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Peña Nogales, Óscar
03724eba97c797eb
500
Zhang, Yuxin
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500
Wang, Xiaoke
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500
Luis García, Rodrigo de
dc0e06890197bb03
500
0000-0001-5023-6490
Aja Fernández, Santiago
34d13732f8a94aa3
500
0000-0002-5337-5071
H. Holmes, James
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500
Hernando, Diego
ef4ea0ad-fea9-4941-a249-f369315c9c71
500
2018-09-03T17:31:52Z
2018-09-03T17:31:52Z
2018
Magn. Reson. Med 2018;00:1-15
http://uvadoc.uva.es/handle/10324/31374
10.1002/mrm.27462
Producción Científica
Purpose: To present a novel Optimized Diffusion-weighting Gradient waveform Design (ODGD) method for the design of minimum echo time (TE), bulk motion-compensated, and concomitant gradient (CG)-nulling waveforms for diffusion MRI.
Methods: ODGD motion-compensated waveforms were designed for various moment-nullings Mn (n=0,1,2), for a range of b-values, and spatial resolutions, both without (ODGD-Mn) and with CG-nulling (ODGD-Mn-CG). Phantom and in-vivo (brain and liver) experiments were conducted with various ODGD waveforms to compare motion robustness, signal-to-noise ratio (SNR), and apparent diffusion coefficient (ADC) maps with state-of-the-art waveforms.
Results:ODGD-Mn and ODGD-Mn-CG waveforms reduced the TE of state-of-the-art waveforms. This TE reduction resulted in significantly higher SNR (P < 0.05) in both phantom and in-vivo experiments. ODGD-M1 improved the SNR of BIPOLAR (42.8+-5.3 versus 32.9+-3.3) in the brain, and ODGD-M2 the SNR of motion-compensated (MOCO) and Convex Optimized Diffusion Encoding-M2 (CODE-M2) (12.3+-3.6 versus 9.7+-2.9 and 10.2+-3.4, respectively) in the liver. Further, ODGD-M2 also showed excellent motion robustness in the liver. ODGD-M2-CG waveforms reduced the CG-related dephasing effects of non CG-nulling waveforms in phantom and in-vivo experiments, resulting in accurate ADC maps.
Conclusions: ODGD waveforms enable motion-robust diffusion MRI with reduced TEs, increased SNR, and reduced ADC bias compared to state-of-the-art waveforms in theoretical results, simulations, phantoms and in-vivo experiments.
TEC2013-44194-P
VA069U16
application/pdf
eng
Wiley
info:eu-repo/semantics/openAccess
Diffusion-weighted imaging (DWI)
diffusion-weighting gradient waveforms
optimization
motion compensation
concomitant gradient (CG)-nulling
Optimized Diffusion-Weighting Gradient Waveform Design (ODGD) formulation for motion compensation and concomitant gradient nulling
info:eu-repo/semantics/article
SI
ORIGINAL
mrm_template.pdf
mrm_template.pdf
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LICENSE
license.txt
license.txt
text/plain
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oai:uvadoc.uva.es:10324/31374
2021-07-06 10:34:16.235
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/313812021-06-23T13:28:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sanz Estébanez, Santiago Rodrigo
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Cordero Grande, Lucilio
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Sevilla Ruiz, María Teresa
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Revilla Orodea, Ana
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Luis García, Rodrigo de
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0000-0001-5023-6490
Martín Fernández, Marcos Antonio
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0000-0001-9342-9989
Alberola López, Carlos
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0000-0003-3684-0055
2018-09-03T20:02:51Z
2018-09-03T20:02:51Z
2018
Medical Image Analysis, Julio 2018
http://uvadoc.uva.es/handle/10324/31381
Left ventricular rotational motion is a feature of normal and diseased cardiac function. However, classical torsion and twist measures rely on the definition of a rotational axis which may not exist. This paper re- views global and local rotation descriptors of myocardial motion and introduces new curl-based (vortical) features built from tensorial magnitudes, intended to provide better comprehension about fibrotic tissue characteristics mechanical properties. Fifty-six cardiomyopathy patients and twenty-two healthy volun- teers have been studied using tagged magnetic resonance by means of harmonic phase analysis. Rotation descriptors are built, with no assumption about a regular geometrical model, from different approaches. The extracted vortical features have been tested by means of a sequential cardiomyopathy classification procedure; they have proven useful for the regional characterization of the left ventricular function by showing great separability not only between pathologic and healthy patients but also, and specifically, between heterogeneous phenotypes within cardiomyopathies.
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Attribution 4.0 International
Vortical Features for Myocardial Rotation Assessment in Hypertrophic Cardiomyopathy using Cardiac Tagged Magnetic Resonance
info:eu-repo/semantics/article
SI
ORIGINAL
MEDIMA1350.pdf
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oai:uvadoc.uva.es:10324/31381
2021-06-23 15:28:16.168
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/313822021-06-23T13:28:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sanz Estébanez, Santiago Rodrigo
f651927f8dced1d1
500
Pieciak, Tomasz
a3f93798-c2c9-4d1b-a6ac-315115eb4bcc
500
Alberola López, Carlos
d668f9d092c4b27e
500
0000-0003-3684-0055
Aja Fernández, Santiago
34d13732f8a94aa3
500
0000-0002-5337-5071
2018-09-03T20:08:58Z
2018-09-03T20:08:58Z
2018
Magnetic Resonance Imaging, Julio 2018
http://uvadoc.uva.es/handle/10324/31382
Purpose: In this work we have proposed a methodology for the estimation of the apparent diffusion coeffcient in the body from multiple breath hold diffusion weighted images, which is robust to two preeminent confounding factors: noise and motion during acquisition.
Methods: We have extended a method for the joint groupwise multimodal registration and apparent diffusion coefficient estimation, previously proposed by the authors, in order to correct the bias that arises from the non-Gaussianity of the data and the registration procedure.
Results: Results show that the proposed methodology provides a statistically signi ficant improvement both in robustness for displacement elds calculation and in terms of accuracy for the apparent diffusion coefficient estimation as compared with traditional sequential approaches. Reproducibility has also been measured on real data in terms of the distribution of apparent diffusion coefficient differences obtained from different b-values subsets.
Conclusions: Our proposal has shown to be able to effectively correct the estimation bias by introducing additional computationally light procedures to the original method, thus providing robust apparent diffusion coefficient maps in the liver and allowing an accurate and reproducible analysis of the tissue.
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info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
Robust Estimation of the Apparent Diffusion Coefficient Invariant to Acquisition Noise and Physiological Motion
info:eu-repo/semantics/article
SI
ORIGINAL
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oai:uvadoc.uva.es:10324/31382
2021-06-23 15:28:17.269
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/314132021-06-24T10:25:59Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Prieto, Luis P.
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600
Rodríguez Triana, María Jesús
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500
Martínez Maldonado, Roberto
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Dimitriadis Damoulis, Ioannis
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0000-0001-7275-2242
Gašević, Dragan
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2018-09-06T07:59:01Z
2018-09-06T07:59:01Z
2018
Australasian Journal of Educational Technology (accepted, july 2018)
1449-5554
http://uvadoc.uva.es/handle/10324/31413
Producción Científica
Despite the recent surge of interest in learning analytics (LA), their adoption in everyday
classroom practice is still slow. Knowledge gaps and lack of inter-stakeholder communication
(particularly with educational practitioners) have been posited as critical factors for previous
LA adoption failures. Yet, what issues should researchers, practitioners and other actors
communicate about, when considering the adoption of an LA innovation in a particular
context? We reviewed and synthesised existing literature on four focus areas related to LA,
their adoption, implications for practice, and more general factors that have emerged as crucial
when studying everyday classroom adoption of technologies (i.e., classroom orchestration).
This synthesis resulted in two conversational frameworks and an inter-stakeholder
communication tool. These can be used to guide and support conversations and decisionmaking about the adoption of LA innovations. We illustrate their usefulness with examples of use in ongoing LA adoption processes in Australia, Spain and Estonia.
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA082U16)
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199-C3-2-R and TIN2017-85179-C3-2-R),
Ministerio de Educación, Cultura y Deporte (PRX17/00410)
application/pdf
eng
Australasian Society for Computers in Learning in Tertiary Education
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje
Aula
Orchestrating learning analytics (OrLA): Supporting inter-stakeholder communication about adoption of learning analytics at the classroom level
info:eu-repo/semantics/article
https://ajet.org.au/index.php/AJET/index
info:eu-repo/grantAgreement/EC/H2020/669074
info:eu-repo/grantAgreement/EC/H2020/731685
SI
ORIGINAL
2018_Prieto_etal_AJET-4314.pdf
2018_Prieto_etal_AJET-4314.pdf
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2021-06-24 12:25:59.132
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oai:uvadoc.uva.es:10324/314142021-06-23T13:28:23Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Dagnino, Francesca Maria
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500
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
Rubia Avi, Bartolomé
c6ddc338eafbf49f
500
0000-0002-4963-4552
Pozzi, Francesca
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500
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
2018-09-06T08:28:49Z
2018-09-06T08:28:49Z
2018
British Journal of Educational Technology (accepted, july 2018)
0007-1013
http://uvadoc.uva.es/handle/10324/31414
Producción Científica
Learning Design (LD) is oriented to support teachers in designing their teaching with the aim to
provide a sound pedagogical background and to make effective use of resources and technologies. In spite of the significant number of LD approaches and tools proposed so far, their adoption is still very limited and this represents an unsolved challenge in the field of LD. This paper presents a systematic review of the literature about learning design tools, tackling the issue of adoption from two points of view: teachers’ needs in relation to LD tools and methods and possible barriers to their adoption. The review includes only research papers where teachers’ behaviours and opinions are directly explored and not purely theoretical papers. The search included five main academic databases in Technology Enhanced Learning (TEL) plus a search on Google about project reports; the resulting corpus included 423 papers: 26 of these, plus 3 reports were included in the final list for the analysis. The review provides a systematic overview of the knowledge developed in the LD field, focusing on a set of research gaps that need further exploration in the future.
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199-C3-2-R and TIN2017- 85179-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
European Commission (Proyect 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Wiley
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Tecnología de aprendizaje
Diseño de aprendizaje
Exploring teachers’ needs and the existing barriers to the adoption of Learning Design methods and tools: a literature survey
info:eu-repo/semantics/article
https://onlinelibrary.wiley.com/journal/14678535
SI
ORIGINAL
2018_Dagnino_etal_bjet.pdf
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oai:uvadoc.uva.es:10324/314162021-06-23T13:28:30Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
2018-09-06T08:47:44Z
2018-09-06T08:47:44Z
2018
Journal of Universal Computer Science (accepted 2018)
0948-695X
http://uvadoc.uva.es/handle/10324/31416
Producción Científica
The early detection of learners who are expected to disengage with typical MOOC tasks such as watching lecture videos or submitting assignments is necessary to enable timely interventions aimed at preventing it. This can be done by predicting the decrease of academic engagement indicators that can be derived for di_erent MOOC tasks and computed for each learner. A posteriori prediction models can yield a good performance but cannot be built using the information that is available in an ongoing course at the moment the predictions are required. This paper proposes an approach to build in situ prediction models using such information. Models were derived following both approaches and employed to predict the decrease of three indicators that quantify the engagement of learners with the main tasks typically proposed in a MOOC: watching lectures, solving _nger exercises, and submitting assignments. The results show that in situ models yielded a good performance for the prediction of all engagement indicators, thus showing the feasibility of the proposed approach. This performance was very similar to that of a posteriori models, which have the clear disadvantage that they cannot be used to make predictions in an ongoing course based on its data.
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199-C3-2-R (AEI, FEDER), TIN2017-85179-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA277U14)
European Commission (Proyect 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Graz University of Technology, Institut für Informationssysteme und Computer Medien
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
MOOC
Aprendizaje automático
An approach to build in situ models for the prediction of the decrease of academic engagement indicators in Massive Open Online Courses
info:eu-repo/semantics/article
http://www.jucs.org/
SI
ORIGINAL
2018_Bote-Lorenzo_etal_JUCS_preprint.pdf
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2021-06-23 15:28:30.083
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oai:uvadoc.uva.es:10324/314192021-06-23T13:28:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sanz Martínez, María Luisa
75afc2c1a329afdc
500
Er, Erkan
be978ee2a7ae293b
500
0000-0002-9624-4055
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
2018-09-06T09:13:50Z
2018-09-06T09:13:50Z
2018
Journal of Universal Computer Science (accepted 2018)
http://uvadoc.uva.es/handle/10324/31419
Producción Científica
Collaborative learning strategies, which can promote student learning and achievement, have rarely been incorporated into pedagogies of MOOCs. Such strategies, when implemented properly, can boost the quality of MOOC pedagogy. Nonetheless, the use of collaborative groups in MOOCs is scarce due to several yet critical contextual factors (e.g., massiveness, and variable levels of engagement) that hamper the group formation process.
Therefore, there is a need for supporting MOOC teachers in the design and implementation of group formation policies when implementing collaborative strategies. This paper presents a study where two instruments were used to explore solutions to this need: a guide to support teachers during the planning of the group formation, and a technological tool to help them implement the collaborative groups designed and to monitor them. According to the results of the study, the design guide made the teachers aware of the contextual factors to consider when forming the collaborative groups, and allowed teachers inform some configuration parameters of the activity (e.g., duration and assessment type) and the group formation (e.g., criteria and parameters needed to build the groups). The technological tool was successfully incorporated into the MOOC platform. Lessons learned from the findings of the study are shared and their potential to inform the design guide is discussed.
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199- C3-2-R and TIN2017-85179-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
European Commission (Proyect 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Graz University of Technology, Institut für Informationssysteme und Computer Medien
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
MOOC
Aprendizaje colaborativo
Supporting Teachers in the Design and Implementation of Group Formation Policies in MOOCs: A Case Study
info:eu-repo/semantics/article
http://www.jucs.org/
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oai:uvadoc.uva.es:10324/314202024-02-02T09:24:00Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Serrano Iglesias, Sergio
562b6509b6096ebf
500
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Asensio Pérez, Juan Ignacio
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500
0000-0002-1114-2819
Rodríguez Cayetano, Manuel
027a01c2abb9fef0
600
0000-0001-5356-4764
2018-09-06T09:28:30Z
2018-09-06T09:28:30Z
2018
Cluster Computing, 2018 (in press)
1386-7857
http://uvadoc.uva.es/handle/10324/31420
https://doi.org/10.1007/s10586-018-2816-5
Producción Científica
While parameter sweep simulations can help undergraduate students and researchers to understand computer networks, their usage in the academia is hindered by the significant computational load they convey. This paper proposes DNSE3, a service oriented computer network simulator that, deployed in a cloud computing infrastructure, leverages its elasticity and pay-per-use features to compute parameter sweeps. The performance and cost of using this application is evaluated in several experiments applying different scalability policies, with results that meet the demands of users in educational institutions. Additionally, the usability of the application has been measured following industry standards with real students, yielding a very satisfactory user experience.
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199-C3-2-R and TIN2017-85179-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
application/pdf
eng
Springer Verlag
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Simulación por ordenador
Aplicación informática en la nube
A self-scalable distributed network simulation environment based on cloud computing
info:eu-repo/semantics/article
https://link.springer.com/article/10.1007/s10586-018-2816-5
SI
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2024-02-02 10:24:00.837
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/314212021-06-23T13:28:32Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Vega Gorgojo, Guillermo
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0000-0002-6916-9213
2018-09-06T09:40:43Z
2018-09-06T09:40:43Z
2018
Semantic Web, 2018
http://uvadoc.uva.es/handle/10324/31421
Producción Científica
DBpedia is a large-scale and multilingual knowledge base generated by extracting structured data from Wikipedia. There have been several attempts to use DBpedia to generate questions for trivia games, but these initiatives have not succeeded to produce large, varied, and entertaining question sets. Moreover, latency is too high for an interactive game if questions are created by submitting live queries to the public DBpedia endpoint. These limitations are addressed in Clover Quiz, a turn-based multiplayer trivia game for Android devices with more than 200K multiple choice questions (in English and Spanish) about different domains generated out of DBpedia. Questions are created off-line through a data extraction pipeline and a versatile template-based mechanism. A back-end server manages the question set and the associated images, while a mobile app has been developed and released in Google Play. The game is available free of charge and has been downloaded by more than 5K users since the game was released in March 2017. Players have answered more than 614K questions and the overall rating of the game is 4.3 out of 5.0. Therefore, Clover Quiz demonstrates the advantages of semantic technologies for collecting data and automating the generation of multiple choice questions in a scalable way.
Ministerio de Economía, Industria y Competitividad (Projects TIN2017-85179-C3-2-R and RESET TIN2014-53199-C3-2-
application/pdf
eng
IOS Press
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
DBpedia
Aplicación móvil
Clover Quiz: a trivia game powered by DBpedia
info:eu-repo/semantics/article
http://www.semantic-web-journal.net/content/clover-quiz-trivia-game-powered-dbpedia-0
SI
ORIGINAL
2017-SWJ-trebial-camera.pdf
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2021-06-23 15:28:32.528
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oai:uvadoc.uva.es:10324/314232021-06-23T13:28:24Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Mediavilla Pastor, Carlos
e1b772ff-1353-45b2-aa89-b39f6515087e
500
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
2018-09-06T10:27:45Z
2018-09-06T10:27:45Z
2018
Computer Networks Volume 132, 2018, Pages 68-80
1389-1286
http://uvadoc.uva.es/handle/10324/31423
https://doi.org/10.1016/j.comnet.2018.01.005
Producción Científica
Accurate link quality predictions are key in community wireless mesh networks (CWMNs) to improve the performance of routing protocols. Unlike other techniques, online machine learning algorithms can be used to build link quality predictors that are adaptive without requiring a predeployment effort. However, the use of these algorithms to make link quality predictions in a CWMN has not been previously explored. This paper analyses the performance of 4 well-known online machine learning algorithms for link quality prediction in a CWMN in terms of accuracy and computational load. Based on this study, a new hybrid online algorithm for link quality prediction is proposed. The evaluation of the proposed algorithm using data from a real large scale CWMN shows that it can achieve a high accuracy while generating a low computational load.
Ministerio de Economía, Industria y Competitividad (Project TIN2014-53199-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje automático
Online machine learning algorithms to predict link quality in community wireless mesh networks
info:eu-repo/semantics/article
https://www.sciencedirect.com/science/article/pii/S1389128618300069
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oai:uvadoc.uva.es:10324/314242021-06-23T13:28:25Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
8c6b2e45-6dfb-4349-a028-36e2568922ab
500
Gallego Lema, Vanesa
8bd2585d-93e0-4035-ba52-bf3123e58aa3
500
Arribas Cubero, Higinio Francisco
11955f12c21e2613
500
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
2018-09-06T10:40:56Z
2018-09-06T10:40:56Z
2018
IEEE Transactions on Learning Technologies, 2018 (in press)
http://uvadoc.uva.es/handle/10324/31424
http://dx.doi.org/10.1109/TLT.2018.2808491
Producción Científica
Several studies have explored how to help teachers carry out learning situations involving Augmented Reality (AR), a technology that has shown different affordances for learning. However, these proposals tend to rely on specific types of AR, focus on particular types of spaces, and are generally disconnected from other technologies widely used in education, such as VLEs or Web 2.0 tools. These constraints limit the possible range of activities that can be conducted and their integration into the existing classroom practice. GLUEPS-AR is a system that can help overcome these limitations, aiding teachers in the creation and enactment of learning situations that may combine multiple types of AR with other common web tools. This paper presents an evaluation study conducted on Game of Blazons, a learning situation carried out by two university teachers using GLUEPS-AR, and framed within two days of outdoor activities in a village in Spain. The evaluation showed that GLUEPS-AR provided an affordable support to the participant teachers to integrate several activities that made use of multiple types of AR, common web tools and augmented paper, into a unique learning situation.
Ministerio de Economía, Industria y Competitividad (Projects TIN2011-28308-C03-02 and TIN2014-53199-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
application/pdf
eng
Institute of Electrical and Electronics Engineers (IEEE)
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Tecnologías de aprendizaje
Realidad virtual
Game of Blazons: Helping teachers conduct learning situations that integrate web tools and multiple types of augmented reality
info:eu-repo/semantics/article
https://ieeexplore.ieee.org/document/8300658/
SI
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2021-06-23 15:28:25.674
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/314252021-06-23T13:28:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Muñoz Cristóbal, Juan Alberto
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Hernández Leo, Davinia
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Carvalho, Lucila
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Martínez Maldonado, Roberto
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Thompson, Kate
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Wardak, Dewa
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Goodyear, Peter
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2018-09-06T10:50:38Z
2018-09-06T10:50:38Z
2018
Australasian Journal of Educational Technology, 34(2), 2018
http://uvadoc.uva.es/handle/10324/31425
https://doi.org/10.14742/ajet.3706
Producción Científica
A number of researchers have explored the role and nature of design in education, proposing a diverse array of life cycle models. Design plays subtly different roles in each of these models. The learning design research community is shifting its attention from the representation of pedagogical plans to considering design as an ongoing process. As a result, the study of the artefacts generated and used by educational designers is also changing: from a focus on the final designed artefact (the product of the design process) to the many artefacts generated and used by designers at different stages of the design process (e.g., sketches, reflections, drawings, or pictures). However, there is still a dearth of studies exploring the evolution of such artefacts throughout the learning design life cycle. A deeper understanding of these evolutionary processes is needed – to help smooth the transitions between stages in the life cycle. In this paper, we introduce the four-dimensional framework for artefacts in design (4FAD) to generate understanding and facilitate the mapping of the evolution of learning design artefacts. We illustrate the value of the framework by applying it in the analysis of an authentic design case.
Ministerio de Economía, Industria y Competitividad (Projects TIN2011-28308-C03-02, TIN2014-53199-C3-2-R, TIN2014-53199-C3-3-R, TIN2017-85179-C3-2-R, TIN2017-85179-C3-3-R, MDM-2015-0502)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
European Commission (Proyect 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Australasian Society for Computers in Learning in Tertiary Education
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Educación
Aprendizaje automático
4FAD: A framework for mapping the evolution of artefacts in the learning design process
info:eu-repo/semantics/article
https://ajet.org.au/index.php/AJET/article/view/3706
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oai:uvadoc.uva.es:10324/314262021-06-23T13:28:34Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Hernández Leo, Davinia
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Martínez Maldonado, Roberto
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Pardo, Abelardo
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Muñoz Cristóbal, Juan Alberto
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Rodríguez Triana, María Jesús
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2018-09-06T11:11:00Z
2018-09-06T11:11:00Z
2018
British Journal of Educational Technology, 2018 (in press)
0007-1013
http://uvadoc.uva.es/handle/10324/31426
https://doi.org/10.1111/bjet.12645
Producción Científica
The field of learning design studies how to support teachers in devising suitable activities for their students to learn. The field of learning analytics explores how data about students' interactions can be used to increase the understanding of learning experiences. Despite its clear synergy, there is only limited and fragmented work exploring the active role that data analytics can play in supporting design for learning. This paper builds on previous research to propose a framework (analytics layers for learning design) that articulates three layers of data analytics—learning analytics, design analytics and community analytics—to support informed decision‐making in learning design. Additionally, a set of tools and experiences are described to illustrate how the different data analytics perspectives proposed by the framework can support learning design processes.
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199-C3-2-R, TIN2014-53199-C3-3-R, TIN2017-85179-C3-2-R, TIN2017-85179-C3-3-R, MDM-2015- 0502)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA082U16)
European Commission (Proyect 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
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Wiley
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje
Analytics for learning design: A layered framework and tools
info:eu-repo/semantics/article
https://onlinelibrary.wiley.com/doi/abs/10.1111/bjet.12645
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oai:uvadoc.uva.es:10324/314272021-06-23T13:28:27Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Hernández Leo, Davinia
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Asensio Pérez, Juan Ignacio
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0000-0002-1114-2819
Derntl, Michael
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Pozzi, Francesca
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Chacón, Jonathan
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Prieto, Luis P.
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Persico, Donatella
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2018-09-06T11:23:32Z
2018-09-06T11:23:32Z
2018
Frontiers in ICT, 5:9, 2018
http://uvadoc.uva.es/handle/10324/31427
https://doi.org/10.3389/fict.2018.00009
Producción Científica
Learning design tools aim at supporting practitioners in their task of creating more innovative and effective computer-supported learning situations. Despite there being a myriad of proposed tools, their use presents challenges that recent studies link with practitioners' varied pedagogical approaches and context restrictions, as well as with barriers to practical application derived from the fact that most tools only cover limited functionality and do not support cooperation between practitioners. In this paper we investigate whether it is possible to provide a flexible community system that supports multiple learning design tasks. We propose an Integrated Learning Design Environment (ILDE), which is a networked system integrating collaboration functions, design editors and middleware that enables deployment of the designed learning situations into Virtual Learning Environments. We describe the iterative user-centered process adopted in the design of ILDE as well as its architecture. The architecture is implemented to show its feasibility and that it is capable of providing the targeted functionality. We also present the results of its use in training workshops with 148 practitioners from five different institutions in vocational training, higher and adult education. Some of the learning designs were deployed in VLEs and enacted with students in real learning situations.
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eng
Frontiers Media
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Aprendizaje automático
Tecnologías educativas
An Integrated Environment for Learning Design
info:eu-repo/semantics/article
https://www.frontiersin.org/articles/10.3389/fict.2018.00009/full
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oai:uvadoc.uva.es:10324/314282021-06-23T13:28:28Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
García Sastre, Sara
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0000-0002-1196-2892
Idrissi-Ghlimi Cao, Miriam
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Ortega Arranz, Alejandro
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Gómez Sánchez, Eduardo
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0000-0003-0062-916X
2018-09-06T11:38:43Z
2018-09-06T11:38:43Z
2018
RIED: Revista Latinoamericana de Educación a Distancia, 2018, 21(2):263-283
http://uvadoc.uva.es/handle/10324/31428
http://dx.doi.org/10.5944/ried.21.2.20410
Producción Científica
Los cursos online masivos y abiertos (MOOC: Massive Open Online Courses) presentan un gran potencial para permitir el acceso a la educación superior a cualquier estudiante de manera gratuita y que tenga la posibilidad de acceder a Internet. Sin embargo, su modelo de enseñanza es habitualmente criticado, y múltiples investigadores defienden la aplicación de pedagogías activas para tratar de alcanzar un mejor aprendizaje, como ya es frecuente en el aula presencial. Las diferencias de contexto en estos cursos, como la heterogeneidad de perfiles, la escala o el asincronismo se argumentan con frecuencia como limitadores. Este artículo presenta la exploración de veinte cursos masivos, en diferentes idiomas, en distintas plataformas y en diversos dominios de conocimiento, con el objetivo de analizar en detalle el uso del aprendizaje colaborativo y de la gamificación en los mencionados cursos. Las evidencias encontradas permiten concluir que, a pesar de que hay una preocupación por fomentar la interacción social, no existe una intención pedagógica en ella; y además, si se produce el aprendizaje colaborativo es de manera espontánea, no buscada como el eje central del proceso en el diseño instruccional. Por otro lado, la gamificación sí está presente como elemento motivador, pero está dirigida fundamentalmente a premiar acciones individuales de los estudiantes, no los logros colectivos. También se observa que las distintas plataformas MOOC frecuentan ser complementadas con otras herramientas para tratar de apoyar la interacción de los participantes y la gamificación
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA082U16)
Ministerio de Economía, Industria y Competitividad (Projects TIN2014-53199- C3-2-R y TIN2017-85179-C3-2-R)
application/pdf
spa
Asociación Iberoamericana de Educación Superior a Distancia (AIESAD)
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Cursos online
Gamificación
Uso de la colaboración y la gamificación en MOOC: un análisis exploratorio
info:eu-repo/semantics/article
http://revistas.uned.es/index.php/ried/article/view/20410
SI
ORIGINAL
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oai:uvadoc.uva.es:10324/314352021-06-23T13:28:30Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Marín Juarros, V.I.
ac28407c-07a5-4d3a-bcee-39a70855a3c7
500
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Hernández Leo, Davinia
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500
Villagrá Sobrino, Sara Lorena
e4d859ee08d929c8
500
0000-0003-2516-0492
García Sastre, Sara
5a5e5820632e4ddb
500
0000-0002-1196-2892
2018-09-07T07:25:10Z
2018-09-07T07:25:10Z
2018
Technology, Pedagogy and Education, 2018 (in press)
1475-939X
http://uvadoc.uva.es/handle/10324/31435
Producción Científica
This paper describes a study on online collaborative design in the context of teacher
professional development. 25 teachers from different Spanish universities and disciplines
participated in the study. The aim was to understand how to support teachers in
interuniversity teams to collaborate fully online along the learning design process of a
discipline-based situation that integrates ICT, a problem scarcely tackled in the literature. The
described interpretive study, using mixed methods, explores the support to online co-design
provided by a novel ICT community platform named ILDE (Integrated Learning Design
Environment). Lessons drawn from the results can contribute to the improvement of online
collaborative design processes in the context of teacher professional development.
application/pdf
eng
Taylor & Francis
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Tecnologías de aprendizaje
Diseño colaborativo
Supporting Online Collaborative Design for Teacher Professional Development
info:eu-repo/semantics/article
https://www.tandfonline.com/toc/rtpe20/current
SI
ORIGINAL
2018_Marin_TPE.pdf
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2021-06-23 15:28:30.934
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/334872021-06-23T13:28:38Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merayo Álvarez, Noemí
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0000-0002-6920-0778
Juárez Estévez, David
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Aguado Manzano, Juan Carlos
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0000-0002-2495-0313
Miguel Jiménez, Ignacio de
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0000-0002-1084-1159
Durán Barroso, Ramón José
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0000-0003-1423-1646
Fernández Reguero, Patricia
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0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
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0000-0001-8729-3085
Abril Domingo, Evaristo José
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0000-0003-4164-2467
2018-12-17T12:29:02Z
2018-12-17T12:29:02Z
2017
IEEE/OSA Journal of Optical Communications and Networking, 2017, Volume 9, Issue 5, pp. 433 - 445
1943-0639
http://uvadoc.uva.es/handle/10324/33487
https://doi.org/10.1364/JOCN.9.000433
Producción Científica
In this paper, a proportional-integral-derivative (PID) controller integrated with a neural network (NN) is proposed to ensure quality of service (QoS) bandwidth requirements in passive optical networks (PONs). To the best of our knowledge, this is the first time an approach that implements a NN to tune a PID to deal with QoS in PONs is used. In contrast to other tuning techniques such as Ziegler-Nichols or genetic algorithms (GA), our proposal allows a real-time adjustment of the tuning parameters according to the network conditions. Thus, the new algorithm provides an online control of the tuning process unlike the ZN and GA techniques, whose tuning parameters are calculated offline. The algorithm, called neural network service level PID (NNSPID), guarantees minimum bandwidth levels to users depending on their service level agreement, and it is compared with a tuning technique based on genetic algorithms (GASPID). The simulation study demonstrates that NN-SPID continuously adapts the tuning parameters, achieving lower fluctuations than GA-SPID in the allocation process. As a consequence, it provides a more stable response than GA-SPID since it needs to launch the GA to obtain new tuning values. Furthermore, NN-SPID guarantees the minimum bandwidth levels faster than GA-SPID. Finally, NN-SPID is more robust than GA-SPID under real-time changes of the guaranteed bandwidth levels, as GA-SPID shows high fluctuations in the allocated bandwidth, especially just after any change is made.
Ministerio de Ciencia e Innovación (Projects TEC2014-53071-C3-2-P and TEC2015-71932-REDT)
application/pdf
eng
Institute of Electrical and Electronics Engineers (IEEE)
info:eu-repo/semantics/openAccess
© 2017 Optical Society of America
Red neuronal (NN)
Red óptica pasiva (PON)
Neural network (NN)
Passive optical network (PON)
PID controller based on a self-adaptive neural network to ensure qos bandwidth requirements in passive optical networks
info:eu-repo/semantics/article
https://ieeexplore.ieee.org/document/7926828
SI
ORIGINAL
PID-controller-2017_JOCN_NMerayo_postprint.pdf
PID-controller-2017_JOCN_NMerayo_postprint.pdf
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https://uvadoc.uva.es/bitstream/10324/33487/1/PID-controller-2017_JOCN_NMerayo_postprint.pdf
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/33487/2/license.txt
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THUMBNAIL
PID-controller-2017_JOCN_NMerayo_postprint.pdf.jpg
PID-controller-2017_JOCN_NMerayo_postprint.pdf.jpg
IM Thumbnail
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https://uvadoc.uva.es/bitstream/10324/33487/3/PID-controller-2017_JOCN_NMerayo_postprint.pdf.jpg
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oai:uvadoc.uva.es:10324/33487
2021-06-23 15:28:38.527
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/334892022-06-28T11:40:36Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merayo Álvarez, Noemí
fe9385c725979c89
500
0000-0002-6920-0778
Pavón Marino, Pablo
dae42664-2d65-4e90-84f8-724b0304772e
500
Aguado Manzano, Juan Carlos
1d6043b2f88c458f
500
0000-0002-2495-0313
Durán Barroso, Ramón José
72e6ffac37e460e9
500
0000-0003-1423-1646
Burrull i Mestres, Francesc
49e90cf0-1919-421e-800d-e2b87c36d984
500
Bueno Delgado, María Victoria
f63bb82a-9a48-42e5-a193-037faf44dc96
500
2018-12-17T12:37:46Z
2018-12-17T12:37:46Z
2017
IEEE/OSA Journal of Optical Communications and Networking, 2017, Volume 9 , Issue 1, pp. 75 - 86
1943-0639
http://uvadoc.uva.es/handle/10324/33489
https://doi.org/10.1364/JOCN.9.000075
Producción Científica
Network utility maximization (NUM) models have been successfully applied to address multiple resource- allocation problems in communication networks. This paper explores, for the first time to our knowledge, their application to modeling the bandwidth-allocation problem in passive optical networks (PONs) and long-reach PONs. Using the NUM model, we propose the FEx-DBA (fair excess-dynamic bandwidth allocation) algorithm, a new DBA scheme to allow a fair and efficient allocation of the upstream channel capacity. The NUM framework provides the mathematical support to formally define the fairness concept in the resource allocation and the guidelines to devise FEx-DBA. A simulation study is conducted, whereby FEx-DBA is compared to a state-of-the-art proposal. We show that FEx-DBA (i) provides bandwidth guarantees to the users according to the service level agreement (SLA) contracted and fairly distributes the excess bandwidths among them; (ii) has a stable response and fast convergence when traffic or SLAs change, avoiding the oscillations appearing in other proposals; (iii) improves average delay and jitter measures; and (iv) only depends on a reduced set of parameters, which can be easily tuned.
Ministerio de Ciencia e Innovación (Projects TEC2014-53071-C3-2-P and TEC2015-71932-REDT)
application/pdf
eng
Institute of Electrical and Electronics Engineers (IEEE)
info:eu-repo/semantics/openAccess
© 2017 Optical Society of America
Asignación dinámica de ancho de banda (DBA)
Red óptica pasiva (PON)
Dynamic bandwidth allocation (DBA)
Passive optical network (PON)
Fair bandwidth allocation algorithm for PONS based on network utility maximization
info:eu-repo/semantics/article
https://ieeexplore.ieee.org/document/7830276
SI
LICENSE
license.txt
license.txt
text/plain
4250
https://uvadoc.uva.es/bitstream/10324/33489/2/license.txt
909e634ba52becf192e4e9b4bcde7863
MD5
2
ORIGINAL
Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf
Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf
application/pdf
985357
https://uvadoc.uva.es/bitstream/10324/33489/1/Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf
99600eac17b5180b0250282136a220dc
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THUMBNAIL
Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf.jpg
Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf.jpg
IM Thumbnail
image/jpeg
964
https://uvadoc.uva.es/bitstream/10324/33489/3/Fair-Bandwidth-201701_JOCN_NMerayo_Postprint.pdf.jpg
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10324/33489
oai:uvadoc.uva.es:10324/33489
2022-06-28 13:40:36.672
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/334902021-06-23T13:28:42Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Durán Barroso, Ramón José
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0000-0003-1423-1646
Fernández, Natalia
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500
Siracusa, Domenico
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500
Francescon, Antonio
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500
Miguel Jiménez, Ignacio de
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500
0000-0002-1084-1159
Rodríguez, Ignacio
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500
Aguado Manzano, Juan Carlos
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500
0000-0002-2495-0313
Salvadori, Elio
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500
Lorenzo Toledo, Rubén Mateo
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0000-0001-8729-3085
2018-12-17T12:50:18Z
2018-12-17T12:50:18Z
2016
Photonic Network Communications, 2016, Volume 31, Issue 2, pp. 259–271
1572-8188
http://uvadoc.uva.es/handle/10324/33490
https://doi.org/10.1007/s11107-015-0562-7
Producción Científica
We have recently proposed and demonstrated, by means of simulation, the benefits of a simple yet effective cognitive technique to enhance stateless Path Computation Element algorithms with the aim of reducing the connection blocking probability when relying on a potentially non-up-to-date traffic engineering database. In this paper, we employ that technique, called elapsed time matrix (ETM), in the framework of the CHRON (Cognitive Heterogeneous Reconfigurable Optical Network) architecture and, more importantly, validate and analyze its performance in an emulation environment (rather than in a simulation environment) supporting impairment-aware lightpath establishment. Not only dynamic lightpath establishment on demand has been studied, but also restoration processes when facing optical link failures. Emulation results demonstrate that ETM reduces the blocking probability when establishing lightpaths on demand, and increases the percentage of successful restorations in case of optical link failure. Moreover, the use of that technique has little impact on lightpath setup time and lightpath restoration time, respectively.
Ministerio de Ciencia e Innovación (Projects TEC2010-21178-C02-02 and TEC2014-53071-C3-2-P)
European Community’s Seventh Framework Programme [FP7/2007-2013] CHRON project (Cognitive Heterogeneous Reconfigurable Optical Network) under grant agreement no 258644
application/pdf
eng
Springer
info:eu-repo/semantics/openAccess
Redes ópticas
Optical networks
Experimental assessment of a cognitive mechanism to reduce the impact of outdated TEDs in optical networks
info:eu-repo/semantics/article
https://link.springer.com/article/10.1007/s11107-015-0562-7
info:eu-repo/grantAgreement/EC/FP7/258644
SI
ORIGINAL
Experimental-assessment2016_PNET_RJDuran_Preprint.pdf
Experimental-assessment2016_PNET_RJDuran_Preprint.pdf
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/33490/2/license.txt
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THUMBNAIL
Experimental-assessment2016_PNET_RJDuran_Preprint.pdf.jpg
Experimental-assessment2016_PNET_RJDuran_Preprint.pdf.jpg
IM Thumbnail
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oai:uvadoc.uva.es:10324/33490
2021-06-23 15:28:42.405
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/335602022-04-25T07:40:06Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ruiz Pérez, Lidia
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Durán Barroso, Ramón José
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Miguel Jiménez, Ignacio de
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Khodashenas, Pouria S.
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Pedreno Manresa, José Juan
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Merayo Álvarez, Noemí
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Aguado Manzano, Juan Carlos
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0000-0002-2495-0313
Pavón Marino, Pablo
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Siddiqui, Shuaib
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Mata, Javier
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Fernández Reguero, Patricia
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Lorenzo Toledo, Rubén Mateo
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Abril Domingo, Evaristo José
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2018-12-19T10:49:30Z
2018-12-19T10:49:30Z
2018
Applied Sciences, 2018, vol. 8, n. 12, 2614
2076-3417
http://uvadoc.uva.es/handle/10324/33560
https://doi.org/10.3390/app8122614
Producción Científica
5G technologies promise to bring new network and service capacities and are expected to introduce significant architectural and service deployment transformations. The Cloud-Radio Access Networks (C-RAN) architecture, enabled by the combination of Software Defined Networking (SDN), Network Function Virtualization (NFV) and Mobile Edge Computing (MEC) technologies, play a key role in the development of 5G. In this context, this paper addresses the problems of Virtual Network Functions (VNF) provisioning (VNF-placement and service chain allocation) in a 5G network. In order to solve that problem, we propose a genetic algorithm that, considering both computing resources and optical network capacity, minimizes both the service blocking rate and CPU usage. In addition, we present an algorithm extension that adds a learning stage and evaluate the algorithm performance benefits in those scenarios where VNF allocations can be reconfigured. Results reveal and quantify the advantages of reconfiguring the VNF mapping depending on the current demands. Our methods outperform previous proposals in the literature, reducing the service blocking ratio while saving energy by reducing the number of active core CPUs.
Ministerio de Economía, Industria y Competitividad (projects TEC2014-53071-C3-2-P, TEC2017-84423-C3-1-P and TEC2015-71932-REDT)
Ministerio de Educación, Cultura y Deporte (projects BES-2015-074514 and FPU14/04227)
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eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
Redes ópticas
Optical networks
A Genetic Algorithm for VNF Provisioning in NFV-Enabled Cloud/MEC RAN Architectures
info:eu-repo/semantics/article
https://www.mdpi.com/2076-3417/8/12/2614
info:eu-repo/grantAgreement/EC/H2020/761727
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2022-04-25 09:40:06.925
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Mata, Javier
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Miguel Jiménez, Ignacio de
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Durán Barroso, Ramón José
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Merayo Álvarez, Noemí
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Kumar Singh, Sandeep
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Jukan, Admela
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Chamania, Mohit
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2018-12-19T11:04:00Z
2018-12-19T11:04:00Z
2018
Optical Switching and Networking, 2018, Volume 28, Pages 43-57
http://uvadoc.uva.es/handle/10324/33562
https://doi.org/10.1016/j.osn.2017.12.006
Producción Científica
Artificial intelligence (AI) is an extensive scientific discipline which enables computer systems to solve problems by emulating complex biological processes such as learning, reasoning and self-correction. This paper presents a comprehensive review of the application of AI techniques for improving performance of optical communication systems and networks. The use of AI-based techniques is first studied in applications related to optical transmission, ranging from the characterization and operation of network components to performance monitoring, mitigation of nonlinearities, and quality of transmission estimation. Then, applications related to optical network control and management are also reviewed, including topics like optical network planning and operation in both transport and access networks. Finally, the paper also presents a summary of opportunities and challenges in optical networking where AI is expected to play a key role in the near future.
Ministerio de Economía, Industria y Competitividad (Project EC2014-53071-C3-2-P, TEC2015-71932-REDT)
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Elsevier
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Attribution 4.0 International
Red óptica
Inteligencia artificial
Optical network
Artificial intelligence
Artificial intelligence (AI) methods in optical networks: A comprehensive survey
info:eu-repo/semantics/article
https://www.sciencedirect.com/science/article/pii/S157342771730231X
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oai:uvadoc.uva.es:10324/386282021-06-23T13:28:46Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ortega Arranz, Alejandro
b7bf1a62455ba8c1
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Er, Erkan
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500
0000-0002-9624-4055
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Bote Lorenzo, Miguel Luis
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0000-0002-8825-0412
Asensio Pérez, Juan Ignacio
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0000-0002-1114-2819
Muñoz Cristóbal, Juan Alberto
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2019-10-17T11:14:46Z
2019-10-17T11:14:46Z
2019
Universal Access in the Information Society, 2019, Issue 3
1615-5289
http://uvadoc.uva.es/handle/10324/38628
10.1007/s10209-019-00677-8
533
3
549
Universal Access in the Information Society
18
1615-5297
Producción Científica
Despite the advantages of MOOCs, such as the open and free access to education, these courses are criticized for students’ lack of motivation and their high dropout rates. Gamification is a technique used to increase student motivation and engagement in small-scale educational contexts. However, the effects of gamification on student engagement have been scarcely explored in MOOC environments, and the findings so far are inconsistent. To address this gap, this research work examines the students’ behavior toward earning badges and how it relates to their engagement in a gamified MOOC. According to the results, the behaviors toward badges of the active students were generally positive and significantly correlated with other variables measuring their engagement (e.g., pageviews, submitted tasks, forum posts), although this positive behavior seems to decrease throughout the course. Additionally, students that reported high motivation by badges at the end of the course showed a higher engagement level than those that were not appealed by badges.
European Regional Development Fund, under project grants TIN2014-53199-C3-2-R and TIN2017-85179-C3-2-R
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. Project VA082U16 and VA257P18)
European Commission, under project grant 588438-EPP-1-2017-1-EL-EPPKA2-KA.
application/pdf
eng
Springer Verlag
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Gamification
MOOC
Understanding student behavior and perceptions toward earning badges in a gamified MOOC
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://www.springerprofessional.de/en/understanding-student-behavior-and-perceptions-toward-earning-ba/16971112
SI
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/386312021-06-23T13:28:48Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Er, Erkan
be978ee2a7ae293b
500
0000-0002-9624-4055
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Álvarez Álvarez, Susana
7d9a5f6b0565a059
500
0000-0002-9305-802X
2019-10-17T11:31:59Z
2019-10-17T11:31:59Z
2019
Interactive Learning Environments Volume 27, 2019 - Issue 5-6: The new potentials for Intelligent Tutoring with learning analytics
1049-4820
http://uvadoc.uva.es/handle/10324/38631
10.1080/10494820.2019.1610455
685
5-6
698
Interactive Learning Environments
27
1744-5191
Producción Científica
This paper presents the findings of a mixed-methods research that explored the potentials emerging from aligning learning design (LD) and learning analytics (LA) during the design of a predictive analytics solution and from involving the instructors in the design process. The context was a past massive open online course, where the learner data and the instructors were accessible for posterior analysis and additional data collection. Through a close collaboration with the instructors, the details of the prediction task were identified, such as the target variable to predict and the practical constraints to consider. Two predictive models were built: LD-specific model (with features based on the LD and pedagogical intentions), and a generic model (with cumulative features, not informed by the LD). Although the LD-specific predictive model did not outperform the generic one, some LD-driven features were powerful. The quantity and the power of such features were associated with the degree to which the students acted as guided by the LD and pedagogical intentions. The leading instructor’s opinion about the importance of the learning activities in the LD was compared with the results of the feature importance analysis. This comparison helped identify the problems in the LD. The implications for improving the LD are discussed.
Ministerio de Ciencia e Innovación (Proyect grants TIN2017-85179-C3-2-R and TIN2014-53199-C3-2-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. Project VA257P18)
European Commission under project grant 588438-EPP-1-2017-1-EL-EPPKA2-KA
European Union’s Horizon 2020 under the Marie Sklodowska-Curie grant agreement 793317
application/pdf
eng
Taylor & Francis
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Taylor & Francis
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
MOOC
Learning design
Aligning learning design and learning analytics through instructor involvement: a MOOC case study
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://www.tandfonline.com/doi/abs/10.1080/10494820.2019.1610455?journalCode=nile20
info:eu-repo/grantAgreement/EC/H2020/793317
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THUMBNAIL
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2021-06-23 15:28:48.073
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/386482021-06-23T13:28:49Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ortega Arranz, Alejandro
b7bf1a62455ba8c1
500
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
2019-10-21T08:53:22Z
2019-10-21T08:53:22Z
2019
Computers & Education, 2019, vol. 142. 14 p.
0360-1315
http://uvadoc.uva.es/handle/10324/38648
10.1016/j.compedu.2019.103639
Producción Científica
Despite the benefits of MOOCs (e.g., open access to education offered by prestigious universities), the low level of student engagement remains as an important issue causing massive dropouts in such courses. The use of reward-based gamification strategies is one approach to promote student engagement and prevent dropout. However, there is a lack of solid empirical studies analyzing the effects of rewards in MOOC environments. This paper reports a between-subjects design study conducted in a MOOC to analyze the effects of badges and redeemable rewards on student retention and engagement. Results show that the implemented reward strategies had not significant effect on student retention and behavioral engagement measured through the number of pageviews, task submissions, and student activity time. However, it was found that learners able to earn badges and redeemable rewards participated more in gamified tasks than those learners in the control group. Additionally, results reveal that the participants in the redeemable reward condition requested and earned earlier the rewards than those participants in the badge condition. The potential implications of these findings in the instructional design of future gamified MOOCs are also discussed.
Ministerio de Ciencia, Innovación y Universidades (projects TIN2017-85179-C3-2-R / TIN2014-53199-C3-2-R)
Junta de Castilla y León (project VA257P18)
European Commission (project 588438-EPP-1-2017-1-EL- EPPKA2-KA)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Gamification
Gamificación
MOOC (Massive Open Online Course)
CEMA (Curso En Línea Masivo y Abierto)
Engagement
Compromiso
Retention
Retención
Between-subjects design
Diseño entre sujetos
To reward and beyond: Analyzing the effect of reward-basedstrategies in a MOOC
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://www.sciencedirect.com/science/article/pii/S0360131519301927
SI
THUMBNAIL
To-reward-beyond-MOOC.pdf.jpg
To-reward-beyond-MOOC.pdf.jpg
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https://uvadoc.uva.es/bitstream/10324/38648/4/To-reward-beyond-MOOC.pdf.jpg
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LICENSE
license.txt
license.txt
text/plain
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https://uvadoc.uva.es/bitstream/10324/38648/3/license.txt
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https://uvadoc.uva.es/bitstream/10324/38648/2/license_rdf
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To-reward-beyond-MOOC.pdf
To-reward-beyond-MOOC.pdf
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https://uvadoc.uva.es/bitstream/10324/38648/1/To-reward-beyond-MOOC.pdf
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oai:uvadoc.uva.es:10324/38648
2021-06-23 15:28:49.19
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/386492021-06-23T13:28:49Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sanz Martínez, María Luisa
75afc2c1a329afdc
500
Er, Erkan
be978ee2a7ae293b
500
0000-0002-9624-4055
Martínez Monés, Alejandra
b3395709d1970737
500
0000-0003-3201-0345
Dimitriadis Damoulis, Ioannis
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500
0000-0001-7275-2242
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
2019-10-21T09:12:00Z
2019-10-21T09:12:00Z
2019
Journal Behaviour & Information Technology, 2019, vol. 38, n. 1. p. 1107-1121
0144-929X
http://uvadoc.uva.es/handle/10324/38649
10.1080/0144929X.2019.1571109
Producción Científica
Collaborative learning can improve the pedagogical effectiveness of MOOCs. Group formation, an essential step in the design of collaborative learning activities, can be challenging in MOOCs given the scale and the wide variety in such contexts. We discuss the need for considering the behaviours of the students in the course to form groups in MOOC contexts, and propose a grouping approach that employs homogeneity in terms of students’ engagement in the course. Two grouping strategies with different degrees of homogeneity are derived from this approach, and their impact to form successful groups is examined in a real MOOC context. The grouping criteria were established using student activity logs (e.g. page-views). The role of the timing of grouping was also examined by carrying out the intervention once in the first and once in the second half of the course. The results indicate that in both interventions, the groups formed with a greater degree of homogeneity had higher rates of task-completion and peer interactions, Additionally, students from these groups reported higher levels of satisfaction with their group experiences. On the other hand, a consistent improvement of all indicators was observed in the second intervention, since student engagement becomes more stable later in the course.
Agencia Estatal de Investigación Española - Fondo Europeo de Desarrollo Regional (grants TIN2017-85179-C3-2-R / TIN2014-53199-C3-2-R
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (grant VA257P18)
Comisión Europea (grant 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Taylor & Francis Group
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Informa UK Limited
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Automatic group formation
Formación automática de grupos
MOOC (Massive Open Online Course)
CEMA (Curso En Línea Masivo y Abierto)
Collaborative learning
Aprendizaje colaborativo
Engagement
Compromiso
Homogeneous grouping
Agrupamiento homogéneo
Creating collaborative groups in a MOOC: a homogeneous engagement grouping approach
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://www.tandfonline.com/doi/full/10.1080/0144929X.2019.1571109
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2021-06-23 15:28:49.953
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/386552021-06-23T13:28:51Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Er, Erkan
be978ee2a7ae293b
500
0000-0002-9624-4055
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Dimitriadis Damoulis, Ioannis
b681e8884cb24078
500
0000-0001-7275-2242
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
2019-10-21T10:20:44Z
2019-10-21T10:20:44Z
2019
Behaviour & Information Technology, in press, 2019
1362-3001
http://uvadoc.uva.es/handle/10324/38655
10.1080/0144929X.2019.1669222
Producción Científica
Peer review is one approach to facilitate formative feedback exchange in MOOCs; however, it is often undermined by low participation. To support effective implementation of peer reviews in MOOCs, this research work proposes several predictive models to accurately classify learners according to their expected engagement levels in an upcoming peer-review activity, which offers various pedagogical utilities (e.g. improving peer reviews and collaborative learning activities). Two approaches were used for training the models: in situ learning (in which an engagement indicator available at the time of the predictions is used as a proxy label to train a model within the same course) and transfer across courses (in which a model is trained using labels obtained from past course data). These techniques allowed producing predictions that are actionable by the instructor while the course still continues, which is not possible with post-hoc approaches requiring the use of true labels. According to the results, both transfer across courses and in situ learning approaches have produced predictions that were actionable yet as accurate as those obtained with cross validation, suggesting that they deserve further attention to create impact in MOOCs with real-world interventions. Potential pedagogical uses of the predictions were illustrated with several examples.
European Union’s Horizon 2020 research and innovation programme (Marie Sklodowska-Curie grant 793317)
Ministerio de Ciencia, Innovación y Universidades (projects TIN2017-85179-C3-2-R / TIN2014-53199-C3-2-R)
Junta de Castilla y León (grant VA257P18)
Comisión Europea (grant 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Taylor & Francis Group
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Informa UK Limited
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Engagement prediction
Predicción del compromiso
MOOC (Massive Open Online Course)
CEMA (Curso En Línea Masivo y Abierto)
Peer review
Revisión por pares
In situ learning
Aprendizaje in situ
Generating actionable predictions regarding MOOC learners’ engagement in peer reviews
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://www.tandfonline.com/doi/full/10.1080/0144929X.2019.1669222
info:eu-repo/grantAgreement/EC/H2020/793317
SI
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Generating-act-predictions-MOOC-.pdf.jpg
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2021-06-23 15:28:51.091
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/386602021-06-23T13:28:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Serrano Iglesias, Sergio
562b6509b6096ebf
500
Bote Lorenzo, Miguel Luis
f1c325796ad2da94
500
0000-0002-8825-0412
Gómez Sánchez, Eduardo
4472b7b9f3cf3358
500
0000-0003-0062-916X
Asensio Pérez, Juan Ignacio
928957e48dbad0f9
500
0000-0002-1114-2819
Vega Gorgojo, Guillermo
a1d3b79ce8bacd3c
500
0000-0002-6916-9213
2019-10-21T10:44:58Z
2019-10-21T10:44:58Z
2019
Chang M. et al. (eds) Foundations and Trends in Smart Learning. Lecture Notes in Educational Technology. Proceedings of 2019 International Conference on Smart Learning Environments, Springer, Singapore, pp 187-190
2196-4971
http://uvadoc.uva.es/handle/10324/38660
10.1007/978-981-13-6908-7_27
Producción Científica
Smart Learning Environments hold promise of adapting learning processes to the individual context of students and connecting formal with non-formal learning. To do so, SLEs need to know the current context of the students, regardless of the physical or virtual space where learning takes place. This paper presents an architecture that assists in the deployment and enactment of learning situations across-spaces, able to sense and react to changes in the students’ context in order to adapt the learning process.
ICSLE 2019: International Conference on Smart Learning Environments
Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (projects TIN2014-53199-C3-2-R / TIN2017-85179-C3-2-R)
Comisión Europea (project 588438-EPP-1-2017-1-EL-EPPKA2-KA)
application/pdf
eng
Springer Link
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer Nature
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Smart Learning Environments
Entornos Inteligentes de Aprendizaje
Formal learning
Aprendizaje formal
Non-formal learning
Aprendizaje no formal
Towards the Enactment of Learning Situations Connecting Formal and Non-Formal Learning in SLEs
info:eu-repo/semantics/article
info:eu-repo/semantics/draft
https://link.springer.com/chapter/10.1007/978-981-13-6908-7_27
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oai:uvadoc.uva.es:10324/386642021-06-23T13:28:53Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
García Sastre, Sara
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0000-0002-1196-2892
Ortega Arranz, Alejandro
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Gómez Sánchez, Eduardo
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Villagrá Sobrino, Sara Lorena
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2019-10-21T13:16:15Z
2019-10-21T13:16:15Z
2019
RELATEC: Revista Latinoamericana de Tecnología Educativa, 2019, vol. 18, n. 1. p. 163-174
1695-288X
http://uvadoc.uva.es/handle/10324/38664
10.17398/1695-288X.18.1.163
Producción Científica
Los MOOC (Massive Open Online Courses) siguen irrumpiendo en contextos universitarios de manera significativa. De forma mayoritaria, estos cursos se ofrecen como formación y aprendizaje de acceso universal, propiciando nuevos desafíos en la enseñanza y en sus planteamientos pedagógicos. A pesar de los beneficios de los MOOC en Educación Superior (p.ej. acceso gratuito y ubicuo a la educación), este tipo de cursos son frecuentemente criticados por su modelo de enseñanza centrado en el contenido. De este modo, la aplicación de pedagogías activas se presenta como una posible estrategia para intentar cambiar ese modelo y fomentar la participación de los estudiantes y mejorar las tasas de abandono. Así, el presente trabajo estudia los posibles beneficios de la gamificación y la colaboración para fomentar y motivar la participación de los estudiantes en los MOOC. Para ello, se ha optado por una metodología de investigación enfocada al diseño denominada Design-Based Research (DBR) con la intención de mostrar las evidencias de innovaciones pedagógicas que se han realizado en los diseños de tres MOOC llevados a cabo por la Universidad de Valladolid (España). Los resultados obtenidos en este proceso muestran el potencial de estas técnicas de colaboración y gamificación en MOOC considerando durante el diseño y/o rediseño algunos aspectos importantes para obtener los beneficios deseados.
Junta de Castilla y León - Fondo Europeo de Desarrollo Regional (project VA257P18)
Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (projects TIN2014-53199-C3-2-R / TIN2017-85179-C3-2-R)
Comisión Europea (project 88438-EPP-1-2017-1-EL-EPPKA2-KA)
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Universidad de Extremadura
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Universidad de Extremadura
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
CEMA (Curso En Línea Masivo y Abierto)
MOOC (Massive Open Online Course)
Gamificación
Gamification
Colaboración
Collaboration
Formación
Formation
Enseñanza Universitaria
Higher Education
Reflexiones para la introducción de Colaboración y Gamificación en MOOC
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://relatec.unex.es/article/view/3381
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oai:uvadoc.uva.es:10324/427902021-06-23T13:28:54Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merayo Álvarez, Noemí
fe9385c725979c89
500
0000-0002-6920-0778
Pintos, David de
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500
Aguado Manzano, Juan Carlos
1d6043b2f88c458f
500
0000-0002-2495-0313
Durán Barroso, Ramón José
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500
0000-0003-1423-1646
Miguel Jiménez, Ignacio de
7113cd0f4e4a295a
500
0000-0002-1084-1159
Fernández Reguero, Patricia
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500
0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
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500
0000-0001-8729-3085
Abril Domingo, Evaristo José
e4e2ea80f96dd812
500
0000-0003-4164-2467
2020-10-07T06:52:30Z
2020-10-07T06:52:30Z
2020
2020 22nd International Conference on Transparent Optical Networks (ICTON). Bari, Italy, 2020
http://uvadoc.uva.es/handle/10324/42790
10.1109/ICTON51198.2020.9203432
1
4
Producción Científica
In this paper we propose an experimental SDN (Software Defined Networking) solution over legacy GPON (Gigabit Passive Optical Network) equipment that allow a control of the network configuration and its services. On the one hand, the proposal permits to move certain global bandwidth and service configuration policies outside the GPON so that they can be managed centrally by an SDN controller. In legacy PONs the real-time bandwidth allocation process is made inside the network infrastructure cycle by cycle between the OLT (Optical Line Terminal) and the ONTs (Optical Network Terminals) so the network performance could be adversely affected due to the latency between the SDN controller and the PON. In contrast, the control of some global DBA strategies by SDN techniques could lead to better network and management configuration and therefore our proposal is able to dynamically adjust these policies according to the real-time Quality of Service (QoS) requirements of residential users. On the other hand, the designed SDN proposal permits network subscribers to control the performance of their residential homes. In this way, they can set constraints and dynamically customize the bandwidth of their connected devices in a very transparent and efficient way.
Junta de Castilla y León (Project VA085G19)
Ministerio de Economía, Industria y Competitividad (Project TEC2017-84423-C3-1-P)
INTERREG V-A España-Portugal (POCTEP) program (0677_DISRUPTIVE_2_E)
application/pdf
eng
IEEE
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 IEEE
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Redes ópticas pasivas
passive optical networks
3325 Tecnología de las Telecomunicaciones
An Experimental SDN Proposal over Legacy GPONs to Allow Real-Time Service and Residential Network Reconfiguration
info:eu-repo/semantics/article
info:eu-repo/semantics/draft
https://ieeexplore.ieee.org/document/9203432
SI
THUMBNAIL
ICTON_SDNAccessNetworksWorkshop_NMerayo.pdf.jpg
ICTON_SDNAccessNetworksWorkshop_NMerayo.pdf.jpg
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4608
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/42790/3/license.txt
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ICTON_SDNAccessNetworksWorkshop_NMerayo.pdf
ICTON_SDNAccessNetworksWorkshop_NMerayo.pdf
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https://uvadoc.uva.es/bitstream/10324/42790/1/ICTON_SDNAccessNetworksWorkshop_NMerayo.pdf
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oai:uvadoc.uva.es:10324/42790
2021-06-23 15:28:54.415
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/479622021-08-23T20:47:43Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Chamorro Posada, Pedro
296bb9bd3416d3ff
600
0000-0002-0199-0558
Bengoechea de la Llera, J.
0167b605-c8fd-42a1-853d-eca17b601e71
600
2021-08-23T07:30:05Z
2021-08-23T07:30:05Z
2021
Optical Fiber Technology, 2021, vol. 65, 102592
1068-5200
https://uvadoc.uva.es/handle/10324/47962
10.1016/j.yofte.2021.102592
Producción Científica
In this work, we address the phonon dynamics in the stimulated Brillouin scattering process. There exists a wide consensus on the fact that the slowly varying approximation for the acoustic field cannot be invoked in the transient subphonon regime. We present an analysis where we set the precise limits of validity of this approximation. Our study shows that the resonant behavior of the Stokes interaction permits, in general, a first order treatment of this process in the theoretical analysis of current practical applications. An improved-accuracy first order model is also put forward. Numerical calculations are used to support our conclusions.
Junta de Castilla y León (project VA296P18)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Brillouin scattering
Dispersión de Brillouin
Nonlinear optics
Óptica no lineal
On the first order dynamics of subphonon lifetime transient stimulated Brillouin scattering
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S1068520021001413?via%3Dihub
SI
THUMBNAIL
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LICENSE
license.txt
license.txt
text/plain
3926
https://uvadoc.uva.es/bitstream/10324/47962/3/license.txt
017313583e37a1e4d1253e1ef6c66c6c
MD5
3
CC-LICENSE
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817
https://uvadoc.uva.es/bitstream/10324/47962/2/license_rdf
975848b171c53b753f7e445c8b5bc0e1
MD5
2
ORIGINAL
On-the-first-order-dynamics.pdf
On-the-first-order-dynamics.pdf
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https://uvadoc.uva.es/bitstream/10324/47962/1/On-the-first-order-dynamics.pdf
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10324/47962
oai:uvadoc.uva.es:10324/47962
2021-08-23 22:47:43.002
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/480342021-08-24T20:48:11Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merayo Álvarez, Noemí
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600
0000-0002-6920-0778
Pintos Lumbreras, David de
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600
Aguado Manzano, Juan Carlos
1d6043b2f88c458f
600
0000-0002-2495-0313
Miguel Jiménez, Ignacio de
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600
0000-0002-1084-1159
Durán Barroso, Ramón José
72e6ffac37e460e9
600
0000-0003-1423-1646
Fernández Reguero, Patricia
99d11cf6950c28bc
600
0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
2d213aefd2a0fae2
600
0000-0001-8729-3085
Abril Domingo, Evaristo José
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600
0000-0003-4164-2467
2021-08-24T09:50:34Z
2021-08-24T09:50:34Z
2021
Optical Switching and Networking, 2021, vol. 42, 100631
1573-4277
https://uvadoc.uva.es/handle/10324/48034
10.1016/j.osn.2021.100631
Producción Científica
We propose, and experimentally demonstrate, an SDN (Software Defined Networking) new management solution for legacy GPONs (Gigabit Passive Optical Networks), which allows users to dynamically control their residential networks by means of a management application. In this way, users can customize the allocation of resources (and set constraints, if desired) to connected devices in their residential network, fast and efficiently. This real-time customization enables new business models for network operators and service providers. As a proof of concept and to validate the management solution, we demonstrate, in a testbed environment, the operation of a dynamic network scenario where an operator has a business model in which users have a contracted basic bandwidth, but they are allowed to increase it temporarily when using highly demanding services.
Junta de Castilla y León (grant VA085G19)
Ministerio de Ciencia, Innovación y Universidades (grants (TEC2017-84423-C3-1-P and RED2018-102585-T)
Programa INTERREG V-A España-Portugal (grant 0677_DISRUPTIVE_2_E)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Software defined networking
Redes definidas por software
GPONs
Experimental validation
Validación experimental
Experimental validation of an SDN residential network management proposal over a GPON testbed
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S157342772100028X?via%3Dihub
SI
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Experimental-validation-SDN.pdf.jpg
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Experimental-validation-SDN.pdf
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2021-08-24 22:48:11.106
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/481682021-08-29T18:31:23Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Martín González, Elena
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600
Moya Sáez, Elisa
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600
Menchón Lara, Rosa María
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600
Royuela del Val, Javier
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600
Palencia de Lara, César
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600
0000-0002-3081-0077
Rodríguez Cayetano, Manuel
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600
0000-0001-5356-4764
Simmross Wattenberg, Federico Jesús
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0000-0001-9534-1016
Alberola López, Carlos
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0000-0003-3684-0055
2021-08-27T11:05:47Z
2021-08-27T11:05:47Z
2021
Computer Methods and Programs in Biomedicine, 2021, vol. 207, 106143
0169-2607
https://uvadoc.uva.es/handle/10324/48168
10.1016/j.cmpb.2021.106143
Producción Científica
Background and objective: Recent research has reported methods that reconstruct cardiac MR images acquired with acceleration factors as high as 15 in Cartesian coordinates. However, the computational cost of these techniques is quite high, taking about 40 min of CPU time in a typical current machine. This delay between acquisition and final result can completely rule out the use of MRI in clinical environments in favor of other techniques, such as CT. In spite of this, reconstruction methods reported elsewhere can be parallelized to a high degree, a fact that makes them suitable for GPU-type computing devices. This paper contributes a vendor-independent, device-agnostic implementation of such a method to reconstruct 2D motion-compensated, compressed-sensing MRI sequences in clinically viable times. Methods: By leveraging our OpenCLIPER framework, the proposed system works in any computing device (CPU, GPU, DSP, FPGA, etc.), as long as an OpenCL implementation is available, and development is significantly simplified versus a pure OpenCL implementation. In OpenCLIPER, the problem is partitioned in independent black boxes which may be connected as needed, while device initialization and maintenance is handled automatically. Parallel implementations of both a groupwise FFD-based registration method, as well as a multicoil extension of the NESTA algorithm have been carried out as processes of OpenCLIPER. Our platform also includes significant development and debugging aids. HIP code and precompiled libraries can be integrated seamlessly as well since OpenCLIPER makes data objects shareable between OpenCL and HIP. This also opens an opportunity to include CUDA source code (via HIP) in prospective developments. Results: The proposed solution can reconstruct a whole 12–14 slice CINE volume acquired in 19–32 coils and 20 phases, with an acceleration factor of ranging 4–8, in a few seconds, with results comparable to another popular platform (BART). If motion compensation is included, reconstruction time is in the order of one minute. Conclusions: We have obtained clinically-viable times in GPUs from different vendors, with delays in some platforms that do not have correspondence with its price in the market. We also contribute a parallel groupwise registration subsystem for motion estimation/compensation and a parallel multicoil NESTA subsystem for -norm problem solving.
Ministerio de Economía, Industria y Competitividad (grant TEC2017-82408-R)
Asociación Española Contra el Cáncer (grant PRDVL19001MOYA)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2021 The Authors
Atribución 4.0 Internacional
Magnetic resonance imaging
Imagen por resonancia magnética
Graphics processing unit
Unidad de procesamiento gráfico
OpenCLIPER
A clinically viable vendor-independent and device-agnostic solution for accelerated cardiac MRI reconstruction
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0169260721002182?via%3Dihub
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Clinically-viable-vendor-independent.pdf.jpg
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license.txt
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https://uvadoc.uva.es/bitstream/10324/48168/3/license.txt
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Clinically-viable-vendor-independent.pdf
Clinically-viable-vendor-independent.pdf
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2021-08-29 20:31:23.878
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/484432021-09-19T18:32:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sabzi, Sajad
fd8670e7-c55f-456a-b4dc-265cd45c3417
600
Pourdarbani, Razieh
cf1e2d1a-46ac-49f6-80ac-2e3848c9831c
600
Rohban, Mohammad H.
23c499cd-003b-410d-81af-282c68696dfc
600
García Mateos, Ginés
85983c7b-1965-4c9e-97c5-546abb74e7be
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
2021-09-01T09:04:25Z
2021-09-01T09:04:25Z
2021
Chemometrics and Intelligent Laboratory Systems, 2021, vol. 217, 104404
0169-7439
https://uvadoc.uva.es/handle/10324/48443
10.1016/j.chemolab.2021.104404
Producción Científica
In recent years, farmers have often mistakenly resorted to overuse of chemical fertilizers to increase crop yield. However, excessive consumption of fertilizers might lead to severe food poisoning. If nutritional deficiencies are detected early, it can help farmers to design better fertigation practices before the problem becomes unsolvable. The aim of this study is to predict the amount of nitrogen (N) content in cucumber (Cucumis sativus L., var. Super Arshiya-F1) plant leaves using hyperspectral imaging (HSI) techniques and three different regression methods: a hybrid artificial neural networks-particle swarm optimization (ANN-PSO); partial least squares regression (PLSR); and unidimensional deep learning convolutional neural networks (CNN). Cucumber plant seeds were planted in 20 different pots. After growing the plants, pots were categorized and three levels of nitrogen overdose were applied to each category: 30%, 60% and 90% excesses, called N30%, N60%, N90%, respectively. HSI images of plant leaves were captured before and after the application of nitrogen excess. A prediction regression model was developed for each individual category. Results showed that mean regression coefficients (R) for ANN-PSO were inside 0.937–0.965, PLSR 0.975–0.997, and CNN 0.965–0.985 ranges, test set. We conclude that regression models have a remarkable ability to accurately predict the amount of nitrogen content in cucumber plants from hyperspectral leaf images in a non-destructive way, being PLSR slightly ahead of CNN and ANN-PSO methods.
Ministerio de Ciencia, Innovación y Universidades - Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (grants RTI2018-098958-B-I00 and RTI2018-098156-B-C53)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Hyperspectral imaging
Imágenes hiperespectrales
Image processing
Procesamiento de imágenes
Nitrogen
Nitrógeno
Plants
Plantas
Estimation of nitrogen content in cucumber plant (Cucumis sativus L.) leaves using hyperspectral imaging data with neural network and partial least squares regressions
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://www.sciencedirect.com/science/article/pii/S0169743921001726?via%3Dihub
SI
THUMBNAIL
Estimation-nitrogen-content.pdf.jpg
Estimation-nitrogen-content.pdf.jpg
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ORIGINAL
Estimation-nitrogen-content.pdf
Estimation-nitrogen-content.pdf
application/pdf
1942052
https://uvadoc.uva.es/bitstream/10324/48443/1/Estimation-nitrogen-content.pdf
30440328a754953a804a2c035ec3746b
MD5
1
10324/48443
oai:uvadoc.uva.es:10324/48443
2021-09-19 20:32:35.028
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/484502021-09-19T18:32:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Moya Sáez, Elisa
3793ffdb-a2d8-451a-910f-d3af1e8946b2
600
Peña Nogales, Óscar
03724eba97c797eb
600
Luis García, Rodrigo de
dc0e06890197bb03
600
0000-0001-5023-6490
Alberola López, Carlos
d668f9d092c4b27e
600
0000-0003-3684-0055
2021-09-01T10:05:03Z
2021-09-01T10:05:03Z
2021
Computer Methods and Programs in Biomedicine, 2021, vol. 210, 106371
0169-2607
https://uvadoc.uva.es/handle/10324/48450
10.1016/j.cmpb.2021.106371
Producción Científica
Background and Objective: Synthetic magnetic resonance imaging (MRI) is a low cost procedure that serves as a bridge between qualitative and quantitative MRI. However, the proposed methods require very specific sequences or private protocols which have scarcely found integration in clinical scanners. We propose a learning-based approach to compute T1, T2, and PD parametric maps from only a pair of T1- and T2-weighted images customarily acquired in the clinical routine.
Methods: Our approach is based on a convolutional neural network (CNN) trained with synthetic data; specifically, a synthetic dataset with 120 volumes was constructed from the anatomical brain model of the BrainWeb tool and served as the training set. The CNN learns an end-to-end mapping function to transform the input T1- and T2-weighted images to their underlying T1, T2, and PD parametric maps. Then, conventional weighted images unseen by the network are analytically synthesized from the parametric maps. The network can be fine tuned with a small database of actual weighted images and maps for better performance.
Results:This approach is able to accurately compute parametric maps from synthetic brain data achieving normalized squared error values predominantly below 1%. It also yields realistic parametric maps from actual MR brain acquisitions with T1, T2, and PD values in the range of the literature and with correlation values above 0.95 compared to the T1 and T2 maps obtained from relaxometry sequences. Further, the synthesized weighted images are visually realistic; the mean square error values are always below 9% and the structural similarity index is usually above 0.90. Network fine tuning with actual maps improves performance, while training exclusively with a small database of actual maps shows a performance degradation.
Conclusions:These results show that our approach is able to provide realistic parametric maps and weighted images out of a CNN that (a) is trained with a synthetic dataset and (b) needs only two inputs, which are in turn obtained from a common full-brain acquisition that takes less than 8 minutes of scan time. Although a fine tuning with actual maps improves performance, synthetic data is crucial to reach acceptable performance levels. Hence, we show the utility of our approach for both quantitative MRI in clinical viable times and for the synthesis of additional weighted images to those actually acquired.
Ministerio de Ciencia, Innovación y Universidades (grants TEC2017-82408-R and RTI2018-094569-B-I00)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2021 The Authors
Atribución 4.0 Internacional
Parametric Maps
Mapas paramétricos
Magnetic resonance imaging
Imagen por resonancia magnética
A deep learning approach for synthetic MRI based on two routine sequences and training with synthetic data
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://www.sciencedirect.com/science/article/pii/S0169260721004454?via%3Dihub
SI
THUMBNAIL
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ORIGINAL
Deep-learning-approach.pdf
Deep-learning-approach.pdf
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https://uvadoc.uva.es/bitstream/10324/48450/1/Deep-learning-approach.pdf
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10324/48450
oai:uvadoc.uva.es:10324/48450
2021-09-19 20:32:37.349
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/485852022-07-18T09:32:59Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Robles Mendo, Inés
0c220c85-52f3-4a35-a3db-14329048761e
600
Marques, Gonçalo
b71d13f9-bb07-4b26-ad1a-536b9181bd25
500
Torre Díez, Isabel de la
76d074332eb0bc43
600
0000-0003-3134-7720
López-Coronado Sánchez-Fortún, Miguel
511daeab964e0411
600
0000-0002-1543-9732
Martín Rodríguez, Francisco
0ca41cf920b17d7a
600
0000-0002-1773-2860
2021-09-03T12:16:59Z
2021-09-03T12:16:59Z
2021
Journal of Medical Systems, 2021, vol. 45, n. 10
0148-5598
https://uvadoc.uva.es/handle/10324/48585
10.1007/s10916-021-01762-3
10
Journal of Medical Systems
45
1573-689X
Producción Científica
Despite the increasing demand for artifcial intelligence research in medicine, the functionalities of his methods in health emergency
remain unclear. Therefore, the authors have conducted this systematic review and a global overview study which aims to identify,
analyse, and evaluate the research available on diferent platforms, and its implementations in healthcare emergencies. The methodology
applied for the identifcation and selection of the scientifc studies and the diferent applications consist of two methods. On the one
hand, the PRISMA methodology was carried out in Google Scholar, IEEE Xplore, PubMed ScienceDirect, and Scopus. On the other
hand, a review of commercial applications found in the best-known commercial platforms (Android and iOS). A total of 20 studies
were included in this review. Most of the included studies were of clinical decisions (n=4, 20%) or medical services or emergency
services (n=4, 20%). Only 2 were focused on m-health (n=2, 10%). On the other hand, 12 apps were chosen for full testing on dif ferent devices. These apps dealt with pre-hospital medical care (n=3, 25%) or clinical decision support (n=3, 25%). In total, half
of these apps are based on machine learning based on natural language processing. Machine learning is increasingly applicable to
healthcare and ofers solutions to improve the efciency and quality of healthcare. With the emergence of mobile health devices and
applications that can use data and assess a patient's real-time health, machine learning is a growing trend in the healthcare industry.
Comisión Europea y Ministerio de Industria, Energía y Turismo (under project AAL-20125036 named BWetake Care: ICTbased)
application/pdf
eng
Springer
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2021 The Authors
Atribución 4.0 Internacional
Machine learning
Health emergencies
Emergency medicine
Mobile applications
32 Ciencias Médicas
33 Ciencias Tecnológicas
Machine learning in medical emergencies: a systematic review and analysis
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://link.springer.com/article/10.1007/s10916-021-01762-3
SI
THUMBNAIL
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MD5
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LICENSE
license.txt
license.txt
text/plain
3926
https://uvadoc.uva.es/bitstream/10324/48585/3/license.txt
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MD5
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CC-LICENSE
license_rdf
license_rdf
application/rdf+xml; charset=utf-8
921
https://uvadoc.uva.es/bitstream/10324/48585/2/license_rdf
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ORIGINAL
Machine-learning-medical-emergencies.pdf
Machine-learning-medical-emergencies.pdf
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https://uvadoc.uva.es/bitstream/10324/48585/1/Machine-learning-medical-emergencies.pdf
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10324/48585
oai:uvadoc.uva.es:10324/48585
2022-07-18 11:32:59.822
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/486772021-09-19T18:32:39Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Pourdarbani, Razieh
cf1e2d1a-46ac-49f6-80ac-2e3848c9831c
600
Sabzi, Sajad
fd8670e7-c55f-456a-b4dc-265cd45c3417
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
2021-09-17T06:44:16Z
2021-09-17T06:44:16Z
2021
Heliyon, 2021, vol. 7, n. 9, e07942
2405-8440
https://uvadoc.uva.es/handle/10324/48677
10.1016/j.heliyon.2021.e07942
Producción Científica
Nondestructive estimation of fruit properties during their ripening stages ensures the best value for producers and vendors. Among common quality measurement methods, spectroscopy is popular and enables physicochemical properties to be nondestructively estimated. The current study aims to nondestructively predict tissue firmness (kgf/cm), acidity (pH level) and starch content index (%) in apples (Malus M. pumila) samples (Fuji var.) at various ripening stages using visible/near infrared (Vis-NIR) spectral data in 400–1000 nm wavelength range. Results show that non-linear regression done by an artificial neural network-cultural algorithm (ANN-CA) was able to properly estimate the investigated fruit properties. Moreover, the performance of the proposed method was evaluated for Vis-NIR data based on optimal NIR wavelength values selected by a genetic optimization tool.
Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (project RTI2018-098958-B-I00)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Acidity
Acidez
Artificial neural networks
Redes neuronales artificiales
Physicochemical properties
Propiedades físico-químicas
Nondestructive estimation of three apple fruit properties at various ripening levels with optimal Vis-NIR spectral wavelength regression data
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S2405844021020454?via%3Dihub
SI
THUMBNAIL
Nondestructive-estimation-three-apple.pdf.jpg
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LICENSE
license.txt
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https://uvadoc.uva.es/bitstream/10324/48677/3/license.txt
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Nondestructive-estimation-three-apple.pdf
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oai:uvadoc.uva.es:10324/48677
2021-09-19 20:32:39.403
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/486782022-01-25T21:47:19Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
González Martín, Javier
0a3b6235-57b4-4b3b-bd6b-00b6314b99ef
600
Cantera Ruiz de Pellón, Sara
8ef8f4e6-ed2d-4730-b9f9-ff6e9e1df0a1
600
Lebrero Fernández, Raquel
ef00dc1bd36eb3cc
600
0000-0002-3033-8649
Muñoz Torre, Raúl
70d595c10fca563b
600
0000-0003-1207-6275
2021-09-17T07:12:41Z
2021-09-17T07:12:41Z
2021
Chemosphere, 2021, vol. 287, n. 3, 132182
0045-6535
https://uvadoc.uva.es/handle/10324/48678
10.1016/j.chemosphere.2021.132182
Producción Científica
Biotechnologies have emerged as a promising solution for indoor air purification with the potential to overcome the inherent limitations of indoor air treatment. These limitations include the low concentrations and variability of pollutants and mass-transfer problems caused by pollutant hydrophobicity. A new latex-based biocoating was herein optimized for the abatement of the volatile organic compounds (VOCs) toluene, trichloroethylene, n-hexane, and α-pinene using acclimated activated sludge dominated by members of the phylum Patescibacteria. The influence of the water content, the presence of water absorbing compounds, the latex pretreatment, the biomass concentration, and the pollutant load was tested on VOC removal efficiency (RE) by varying the formulation of the mixtures. Overall, hexane and trichloroethylene removal was low (<30%), while high REs (>90%) were consistently recorded for toluene and pinene. The assays demonstrated the benefits of operating at high water content in the biocoating, either by including mineral medium or water absorbing compounds in the latex-biomass mixtures. The performance of the latex-based biocoating was likely limited by VOC mass-transfer rather than by biomass concentration in the biocoating. The latex-based biocoating supported a superior toluene and pinene removal than biomass in suspension when VOC loading rate was increased by a factor of 4.
Ministerio de Ciencia, Innovación y Universidades (project RTI2018-0-096441-B-I00]
Junta de Castilla y León (grant CLU 2017-09)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Biofiltration
Biofiltración
Indoor air quality
Calidad del aire interior
Latex-based biofilms
Biofilms de latex
Optimization of acrylic-styrene latex-based biofilms as a platform for biological indoor air treatment
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0045653521026540?via%3Dihub
SI
THUMBNAIL
Optimization-acrylic-styrene.pdf.jpg
Optimization-acrylic-styrene.pdf.jpg
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image/jpeg
2303
https://uvadoc.uva.es/bitstream/10324/48678/2/Optimization-acrylic-styrene.pdf.jpg
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ORIGINAL
Optimization-acrylic-styrene.pdf
Optimization-acrylic-styrene.pdf
application/pdf
6942886
https://uvadoc.uva.es/bitstream/10324/48678/1/Optimization-acrylic-styrene.pdf
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MD5
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10324/48678
oai:uvadoc.uva.es:10324/48678
2022-01-25 22:47:19.862
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/488482021-09-29T20:59:00Zcom_10324_48853com_10324_954com_10324_894com_10324_1191com_10324_931col_10324_48854col_10324_1379
Merayo Álvarez, Noemí
fe9385c725979c89
600
0000-0002-6920-0778
Pintos, David de
8ece655a-6d53-4b32-8daf-3083c4e22a64
600
Aguado Manzano, Juan Carlos
1d6043b2f88c458f
600
0000-0002-2495-0313
Miguel Jiménez, Ignacio de
7113cd0f4e4a295a
600
0000-0002-1084-1159
Durán Barroso, Ramón José
72e6ffac37e460e9
600
0000-0003-1423-1646
Fernández Reguero, Patricia
99d11cf6950c28bc
600
0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
2d213aefd2a0fae2
600
0000-0001-8729-3085
Abril Domingo, Evaristo José
e4e2ea80f96dd812
600
0000-0003-4164-2467
2021-09-29T12:31:29Z
2021-09-29T12:31:29Z
2021
Applied Sciences, 2021, vol. 11, n. 3, 903
2076-3417
https://uvadoc.uva.es/handle/10324/48848
10.3390/app11030903
Producción Científica
The integration of Software Defined Networking (SDN) technologies in Passive Optical Networks (PONs) would provide great advantages to Internet Service Providers (ISPs) and Network Operators, since they can optimize the network operation and reduce its complexity. However, some tasks regarding online service and network configuration strategies are difficult to move to external SDN-controllers since they are time-critical operations. However, the control of some of these policies by SDN techniques could lead to better network and management configuration in a centralized and automatic way. As a consequence, we propose and experimentally test the integration of an OpenFlow approach over legacy Gigabit Passive Optical Networks (GPONs), which allows moving some global service configuration policies to an external SDN controller implementing an SDN management layer that adjust these strategies according to dynamic Quality of Service (QoS) requirements of services in residential users. The viability and efficiency of our approach are demonstrated using a GPON testbed and proposing a new business scenario for ISPs and Network Operators.
Ministerio de Ciencia, Innovación y Universidades (projects TEC2017-84423-C3-1-P and RTC2019-007043-7)
Junta de Castilla y León (project VA085G19)
Unión Europea a través del programa INTERREG V-A España-Portugal (project 0677_DISRUPTIVE_2_E)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 MDPI
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Software defined networking
Redes definidas por software
GPONs
Reconfiguration policies
Políticas de reconfiguración
Experimental validation
Validación experimental
An experimental openflow proposal over legacy GPONs to allow real-time service reconfiguration policies
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2076-3417/11/3/903
SI
THUMBNAIL
Experimental-openFlow-proposal.pdf.jpg
Experimental-openFlow-proposal.pdf.jpg
IM Thumbnail
image/jpeg
3623
https://uvadoc.uva.es/bitstream/10324/48848/4/Experimental-openFlow-proposal.pdf.jpg
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LICENSE
license.txt
license.txt
text/plain
3926
https://uvadoc.uva.es/bitstream/10324/48848/3/license.txt
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MD5
3
CC-LICENSE
license_rdf
license_rdf
application/rdf+xml; charset=utf-8
817
https://uvadoc.uva.es/bitstream/10324/48848/2/license_rdf
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MD5
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ORIGINAL
Experimental-openFlow-proposal.pdf
Experimental-openFlow-proposal.pdf
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https://uvadoc.uva.es/bitstream/10324/48848/1/Experimental-openFlow-proposal.pdf
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10324/48848
oai:uvadoc.uva.es:10324/48848
2021-09-29 22:59:00.261
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/488522022-04-25T07:33:07Zcom_10324_48853com_10324_954com_10324_894com_10324_1191com_10324_931col_10324_48854col_10324_1379
Merayo Álvarez, Noemí
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600
0000-0002-6920-0778
Aguado Manzano, Juan Carlos
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600
0000-0002-2495-0313
Miguel Jiménez, Ignacio de
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600
0000-0002-1084-1159
Durán Barroso, Ramón José
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600
0000-0003-1423-1646
Fernández Reguero, Patricia
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600
0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
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0000-0001-8729-3085
Abril Domingo, Evaristo José
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0000-0003-4164-2467
2021-09-29T12:56:22Z
2021-09-29T12:56:22Z
2021
Computer Applications in Engineering Education, 2021, vol. 29, n. 6. p. 1892-1910
1099-0542
https://uvadoc.uva.es/handle/10324/48852
10.1002/cae.22429
Producción Científica
Engineering profiles focused on next-generation optical networks are gaining immense importance due to new emerging services and the amount of data expected in future network scenarios. In fact, not only are optical access networks leading to a major revolution in the network industry, but passive optical networks are the most widely deployed access networks worldwide today. This should be a strong incentive for universities to train their students in these innovative and recent technologies. In this vein, we propose the deployment of an optical communication laboratory with on-site experimental sessions in which students work with commercial equipment and realistic working environments. These working environments are necessary to train professionals in the area of optical networks. However, due to the high cost of the optical communications equipment, it is not possible to have a working place for each group and we combine these experimental sessions with some simulation sessions to complete the training. We present the design of this lab and a qualitative and quantitative study aimed at analyzing students’ experiences, the skills they have acquired, and the potential impact on their future careers. This study shows that students have a very positive perception of the lab, emphasizing that working with real equipment helps them improve technical skills and assimilate theoretical knowledge. They also point out they would like a higher number of subjects in their degrees to employ this type of lab. Finally, students perceive these sessions as very useful for their professional future.
Unión Europea a través del programa INTERREG V-A España-Portugal (project 0677_DISRUPTIVE_2_E)
Junta de Castilla y León (grant VA085G19)
Ministerio de Ciencia, Innovación y Universidades (grants TEC2017-84423-C3-1-P and RED2018-102585-T)
application/pdf
eng
Wiley
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Wiley
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Engineering curriculum
Ingeniería - Programas de estudios
Experimental learning
Aprendizaje experimental
Laboratory
Laboratorio
Optical communications
Comunicación óptica
A testbed and a simulation laboratory for training engineering students in optical access network technologies
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://onlinelibrary.wiley.com/doi/10.1002/cae.22429
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2022-04-25 09:33:07.346
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oai:uvadoc.uva.es:10324/489722022-01-25T21:47:24Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
López Martín, Manuel
7b57558b-4128-4bae-a04d-a1b0c2d4274e
600
Sánchez Esguevillas, Antonio Javier
97193c84-95f7-4139-aff3-40d8ce887d8e
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
Carro Martínez, Belén
3ed0e0c2a10252a4
600
0000-0001-7051-8479
2021-10-08T11:54:48Z
2021-10-08T11:54:48Z
2022
Information Fusion, 2022, vol. 79, p. 200-228
1566-2535
https://uvadoc.uva.es/handle/10324/48972
10.1016/j.inffus.2021.09.014
Producción Científica
Contrastive learning makes it possible to establish similarities between samples by comparing their distances in an intermediate representation space (embedding space) and using loss functions designed to attract/repel similar/dissimilar samples. The distance comparison is based exclusively on the sample features. We propose a novel contrastive learning scheme by including the labels in the same embedding space as the features and performing the distance comparison between features and labels in this shared embedding space. Following this idea, the sample features should be close to its ground-truth (positive) label and away from the other labels (negative labels). This scheme allows to implement a supervised classification based on contrastive learning. Each embedded label will assume the role of a class prototype in embedding space, with sample features that share the label gathering around it. The aim is to separate the label prototypes while minimizing the distance between each prototype and its same-class samples. A novel set of loss functions is proposed with this objective. Loss minimization will drive the allocation of sample features and labels in embedding space. Loss functions and their associated training and prediction architectures are analyzed in detail, along with different strategies for label separation. The proposed scheme drastically reduces the number of pair-wise comparisons, thus improving model performance. In order to further reduce the number of pair-wise comparisons, this initial scheme is extended by replacing the set of negative labels by its best single representative: either the negative label nearest to the sample features or the centroid of the cluster of negative labels. This idea creates a new subset of models which are analyzed in detail.
The outputs of the proposed models are the distances (in embedding space) between each sample and the label prototypes. These distances can be used to perform classification (minimum distance label), features dimensionality reduction (using the distances and the embeddings instead of the original features) and data visualization (with 2 or 3D embeddings).
Although the proposed models are generic, their application and performance evaluation is done here for network intrusion detection, characterized by noisy and unbalanced labels and a challenging classification of the various types of attacks. Empirical results of the model applied to intrusion detection are presented in detail for two well-known intrusion detection datasets, and a thorough set of classification and clustering performance evaluation metrics are included.
Ministerio de Ciencia, Innovación y Universidades - Agencia Estatal de Investigación - Fondo Europeo de Desarrollo Regional (grant RTI2018-098958-B-I00)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Label embedding
Incrustación de etiquetas
Contrastive learning
Aprendizaje contrastivo
Network intrusion detection
Detección de intrusos en red
Supervised contrastive learning over prototype-label embeddings for network intrusion detection
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S1566253521001913?via%3Dihub
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2022-01-25 22:47:24.911
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oai:uvadoc.uva.es:10324/490502021-11-23T13:35:31Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
García Escartín, Juan Carlos
3dcb87f63ca3bc96
600
0000-0002-9813-5004
Gimeno, Vicent
18556381-afd1-4995-a46e-d03bd118018d
600
Moyano Fernández, Julio José
6071a6a2-63d3-4c1d-a7be-8cfa943bc18a
600
2021-10-13T11:59:46Z
2021-10-13T11:59:46Z
2021
Quantum Information Processing, 2021, vol. 20, n. 9, n art. 314, p. 1-18
1570-0755
https://uvadoc.uva.es/handle/10324/49050
10.1007/s11128-021-03254-2
9
Quantum Information Processing
20
1573-1332
Producción Científica
Linear optical systems acting on photon number states produce many interesting evolutions, but cannot give all the allowed quantum operations on the input state. Using
Toponogov’s theorem from differential geometry, we propose an iterative method
that, for any arbitrary quantum operator U acting on n photons in m modes, returns an
operator Ũ which can be implemented with linear optics. The approximation method
is locally optimal and converges. The resulting operator Ũ can be translated into an
experimental optical setup using previous results.
Ministerio de Ciencia e Innovación- FEDER (grants PID2020-119418GB-I00 and PID2020-115930GA-I00)
Junta de Castilla y León (project VA296P18)
Universitat Jaume I (project UJI-B2018- 35 and grant UJI-B2018-10)
Ministerio de Asuntos Económicos y Transformación Digital (grant MTM2017-84851-C2-2)
Ministerios de Ciencia e Innovación y de Universidades (grant PGC2018-096446-B-C22)
application/pdf
eng
Springer
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2021 The Authors
Atribución 4.0 Internacional
Optical implementations of quantum evolutions
Quantum optics
Toponogov’s Theorem
33 Ciencias Tecnológicas
12 Matemáticas
22 Física
Optimal approximation to unitary quantum operators with linear optics
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.springerprofessional.de/en/optimal-approximation-to-unitary-quantum-operators-with-linear-o/19685008
SI
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LICENSE
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2021-11-23 14:35:31.043
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/497622021-12-05T19:30:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Dante, Roberto C.
e86f6f4f-ae36-4567-8ef5-8e2a53bfaa55
500
Martín Ramos, Pablo
8359c0c4-4761-4554-aa10-8c4a325c0ef7
600
Chamorro Posada, Pedro
296bb9bd3416d3ff
600
0000-0002-0199-0558
Rutto, Dario
48a095c2-4def-4085-ac09-8f4421063ea7
500
Vázquez Cabo, José
78b5febd-f7ba-4d51-b929-2864d79cc58c
600
Dante, Denisse G.
1549f5a8-5e14-49ef-9af1-e8c257cbbc00
500
Barberis, Riccardo
040d82fa-170c-454e-ac29-5a8b9d5eb19b
500
Rubiños López, Óscar
971edc31-d7c2-4575-aba6-526536ce775f
600
2021-11-06T18:15:13Z
2021-11-06T18:15:13Z
2020
Fullerenes, Nanotubes and Carbon Nanostructures, 2020, vol. 28 , p. 533-540.
1536-383X
https://uvadoc.uva.es/handle/10324/49762
10.1080/1536383X.2020.1713762
533
7
540
Fullerenes, Nanotubes and Carbon Nanostructures
28
1536-4046
In this work, a new g-C3N4-based Z-scheme with γ-Fe2O3 and β-Ag2Se both n-type semiconductors, and graphite to favor electron exchange is presented. The composite material was studied by XRD, FTIR, UV-Vis, TEM, XPS, TGA, DSC and TOF-SIMS, and the ability of this photocatalytic system to act as a photo-reductant was assessed using crystal violet (CV+) dye. Solar light driven photo-reduction of CV+ in the presence of tri-sodium citrate evidenced a synergistic enhancement of the activity of the composite toward reduction, with ∼20 times higher conversion rates per unit of surface area than those of g-C3N4. Photo-oxidation experiments under Xe lamp irradiation in the presence of H2O2 also showed that the AgFeCN composite featured a higher activity (∼8×) than g-C3N4. This Z-scheme may deserve further study as a photo-reductant to obtain hydrogen or hydrogenated compounds. Moreover, the use of CV+ may represent a facile procedure that can aid in the selection of new photocatalysts to be used in hydrogen production.
application/pdf
spa
Taylor & Francis
info:eu-repo/semantics/openAccess
Solar light-driven reduction of crystal violet by a composite of g-C3N4, β-Ag2Se, γ-Fe2O3 and graphite
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://www.tandfonline.com/doi/abs/10.1080/1536383X.2020.1713762?journalCode=lfnn20
SI
THUMBNAIL
Solar-light-driven-reduction.pdf.jpg
Solar-light-driven-reduction.pdf.jpg
IM Thumbnail
image/jpeg
1624
https://uvadoc.uva.es/bitstream/10324/49762/2/Solar-light-driven-reduction.pdf.jpg
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Solar-light-driven-reduction.pdf
Solar-light-driven-reduction.pdf
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1399774
https://uvadoc.uva.es/bitstream/10324/49762/1/Solar-light-driven-reduction.pdf
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10324/49762
oai:uvadoc.uva.es:10324/49762
2021-12-05 20:30:52.804
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/509482022-01-25T21:47:28Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Martínez Cagigal, Víctor
13061702b3ec2dda
600
0000-0002-3822-1787
Santamaría Vázquez, Eduardo
ce555289-732b-43ad-9b82-1db93de9349d
600
Hornero Sánchez, Roberto
f6af2dd4a94089d7
600
0000-0001-9915-2570
2021-12-15T09:10:03Z
2021-12-15T09:10:03Z
2021
Applied Soft Computing, 2021, vol. 115, 108176
1568-4946
https://uvadoc.uva.es/handle/10324/50948
10.1016/j.asoc.2021.108176
Producción Científica
Many brain–computer interface (BCI) studies overlook the channel optimization due to its inherent complexity. However, a careful channel selection increases the performance and users’ comfort while reducing the cost of the system. Evolutionary meta-heuristics, which have demonstrated their usefulness in solving complex problems, have not been fully exploited yet in this context. The purpose of the study is two-fold: (1) to propose a novel algorithm to find an optimal channel set for each user and compare it with other existing meta-heuristics; and (2) to establish guidelines for adapting these optimization strategies to this framework. A total of 3 single-objective (GA, BDE, BPSO) and 4 multi-objective (NSGA-II, BMOPSO, SPEA2, PEAIL) existing algorithms have been adapted and tested with 3 public databases: ‘BCI competition III–dataset II’, ‘Center Speller’ and ‘RSVP Speller’. Dual-Front Sorting Algorithm (DFGA), a novel multi-objective discrete method especially designed to the BCI framework, is proposed as well. Results showed that all meta-heuristics outperformed the full set and the common 8-channel set for P300-based BCIs. DFGA showed a significant improvement of accuracy of 3.9% over the latter using also 8 channels; and obtained similar accuracies using a mean of 4.66 channels. A topographic analysis also reinforced the need to customize a channel set for each user. Thus, the proposed method computes an optimal set of solutions with different number of channels, allowing the user to select the most appropriate distribution for the next BCI sessions.
Ministerio de Ciencia, Innovación y Universidades (project RTC2019-007350-1)
Comisión Europea (project 0702_MIGRAINEE_2_E)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Brain-computer interfaces
Interfaces cerebro-computadora
Evolutionary algorithms
Algoritmos evolutivos
Brain-computer interface channel selection optimization using meta-heuristics and evolutionary algorithms
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S1568494621010292?via%3Dihub
SI
THUMBNAIL
Brain–computer-interface-channel.pdf.jpg
Brain–computer-interface-channel.pdf.jpg
IM Thumbnail
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2741
https://uvadoc.uva.es/bitstream/10324/50948/2/Brain%e2%80%93computer-interface-channel.pdf.jpg
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ORIGINAL
Brain–computer-interface-channel.pdf
Brain–computer-interface-channel.pdf
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4773928
https://uvadoc.uva.es/bitstream/10324/50948/1/Brain%e2%80%93computer-interface-channel.pdf
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10324/50948
oai:uvadoc.uva.es:10324/50948
2022-01-25 22:47:28.069
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/517782022-01-31T21:46:42Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Santamaría Vázquez, Eduardo
ce555289-732b-43ad-9b82-1db93de9349d
600
Martínez Cagigal, Víctor
13061702b3ec2dda
600
0000-0002-3822-1787
Pérez Velasco, Sergio
29ae85b7-5996-4b5b-8cdb-fc8be6ff5abb
600
Marcos Martínez, Diego
b3b83842-b53a-4a0b-8ab9-922858135fe8
600
Hornero Sánchez, Roberto
f6af2dd4a94089d7
600
0000-0001-9915-2570
2022-01-31T09:36:58Z
2022-01-31T09:36:58Z
2022
Computer Methods and Programs in Biomedicine, 2022, vol. 215, 106623
0169-2607
https://uvadoc.uva.es/handle/10324/51778
10.1016/j.cmpb.2022.106623
Producción Científica
Background and Objective. Brain-computer interfaces (BCI) based on event-related potentials (ERP) are a promising technology for alternative and augmented communication in an assistive context. However, most approaches to date are synchronous, requiring the intervention of a supervisor when the user wishes to turn his attention away from the BCI system. In order to bring these BCIs into real-life applications, a robust asynchronous control of the system is required through monitoring of user attention. Despite the great importance of this limitation, which prevents the deployment of these systems outside the laboratory, it is often overlooked in research articles. This study was aimed to propose a novel method to solve this problem, taking advantage of deep learning for the first time in this context to overcome the limitations of previous strategies based on hand-crafted features. Methods. The proposed method, based on EEG-Inception, a novel deep convolutional neural network, divides the problem in 2 stages to achieve the asynchronous control: (i) the model detects user’s control state, and (ii) decodes the command only if the user is attending to the stimuli. Additionally, we used transfer learning to reduce the calibration time, even exploring a calibration-less approach. Results. Our method was evaluated with 22 healthy subjects, analyzing the impact of the calibration time and number of stimulation sequences on the system’s performance. For the control state detection stage, we report average accuracies above 91% using only 1 sequence of stimulation and 30 calibration trials, reaching a maximum of 96.95% with 15 sequences. Moreover, our calibration-less approach also achieved suitable results, with a maximum accuracy of 89.36%, showing the benefits of transfer learning. As for the overall asynchronous system, which includes both stages, the maximum information transfer rate was 35.54 bpm, a suitable value for high-speed communication. Conclusions. The proposed strategy achieved higher performance with less calibration trials and stimulation sequences than former approaches, representing a promising step forward that paves the way for more practical applications of ERP-based spellers.
Ministerio de Ciencia, Innovación y Universidades - Agencia Estatal de Investigación (grants PID2020-115468RB-I00 and RTC2019-007350-1)
Comisión Europea - Fondo Europeo de Desarrollo Regional (cooperation programme Interreg V-A Spain-Portugal POCTEP 2014–2020)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2022 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Brain-computer interfaces
Interfaces cerebro-computadora
Deep learning
Aprendizaje inteligente
Robust asynchronous control of ERP-Based brain-Computer interfaces using deep learning
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0169260722000086?via%3Dihub
SI
THUMBNAIL
Robust-asynchronous-control.pdf.jpg
Robust-asynchronous-control.pdf.jpg
IM Thumbnail
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2378
https://uvadoc.uva.es/bitstream/10324/51778/4/Robust-asynchronous-control.pdf.jpg
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/51778/3/license.txt
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CC-LICENSE
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https://uvadoc.uva.es/bitstream/10324/51778/2/license_rdf
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10324/51778
oai:uvadoc.uva.es:10324/51778
2022-01-31 22:46:42.725
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/517792022-01-31T21:46:45Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Aja Fernández, Santiago
34d13732f8a94aa3
600
0000-0002-5337-5071
Pieciak, Tomasz
a3f93798-c2c9-4d1b-a6ac-315115eb4bcc
600
Martín Martín, Carmen
7657a7d2-2dc7-446c-9848-be191b88a373
600
Planchuelo Gómez, Álvaro
3aa52ff6bc5600a5
600
0000-0002-2188-4197
Luis García, Rodrigo de
dc0e06890197bb03
600
0000-0001-5023-6490
Tristán Vega, Antonio
a7207fbd8ee14565
600
0000-0002-4614-2501
2022-01-31T09:57:02Z
2022-01-31T09:57:02Z
2022
Medical Image Analysis, 2022, vol. 77, 102356
1361-8415
https://uvadoc.uva.es/handle/10324/51779
10.1016/j.media.2022.102356
Producción Científica
AMURA (Apparent Measures Using Reduced Acquisitions) was originally proposed as a method to infer micro-structural information from single-shell acquisitions in diffusion MRI. It reduces the number of samples needed and the computational complexity of the estimation of diffusion properties of tissues by assuming the diffusion anisotropy is roughly independent on the b-value. This simplification allows the computation of simplified expressions and makes it compatible with standard acquisition protocols commonly used even in clinical practice. The present work proposes an extension of AMURA that allows the calculation of general moments of the diffusion signals that can be applied to describe the diffusion process with higher accuracy. We provide simplified expressions to analytically compute a set of scalar indices as moments of arbitrary orders over either the whole 3-D space, particular directions, or particular planes. The existing metrics previously proposed for AMURA (RTOP, RTPP and RTAP) are now special cases of this generalization. An extensive set of experiments is performed on public data and a clinical clase acquired with a standard type acquisition. The new metrics provide additional information about the diffusion processes inside the brain.
Ministerio de Ciencia, Innovación y Universidades (grant RTI2018-094569-B-I00)
Polish National Agency for Academic Exchange (grant PN/BEK/2019/1/00421)
Ministry of Science and Higher Education of Poland (scholarship 692/STYP/13/2018)
Junta de Castilla y León - Fondo Social Europeo (ID: 376062)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2022 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Diffusion MRI
Difusión MRI
Anisotropic diffusion
Difusión anisotrópica
Moment-based representation of the diffusion inside the brain from reduced DMRI acquisitions: Generalized AMURA
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S1361841522000093?via%3Dihub
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Moment-based-representation-diffusion.pdf.jpg
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/51779/3/license.txt
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Moment-based-representation-diffusion.pdf
Moment-based-representation-diffusion.pdf
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oai:uvadoc.uva.es:10324/51779
2022-01-31 22:46:45.476
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/521062022-09-30T10:48:03Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Aja Fernández, Santiago
34d13732f8a94aa3
600
0000-0002-5337-5071
París l Bandrés, Guillem Lluis
806bf8b3-134c-40d1-865d-305e35e188ee
600
Martín Martín, Carmen
7657a7d2-2dc7-446c-9848-be191b88a373
600
Jones, Derek K.
3c90b19f-0df9-409f-87fc-89f1ebc13da8
600
Tristán Vega, Antonio
a7207fbd8ee14565
600
0000-0002-4614-2501
2022-02-21T09:17:23Z
2022-02-21T09:17:23Z
2022
Magnetic Resonance Imaging, 2022, vol. 88. p. 38-43
0730-725X
https://uvadoc.uva.es/handle/10324/52106
10.1016/j.mri.2022.01.014
Producción Científica
We propose a method that can provide information about the anisotropy and orientation of diffusion in the brain from only 3 orthogonal gradient directions without imposing additional assumptions. The method is based on the Diffusion Anisotropy (DiA) that measures the distance from a diffusion signal to its isotropic equivalent. The original formulation based on a Spherical Harmonics basis allows to go down to only 3 orthogonal directions in order to estimate the measure. In addition, an alternative simplification and a color-coding representation are also proposed. Acquisitions from a publicly available database are used to test the viability of the proposal. The DiA succeeded in providing anisotropy information from the white matter using only 3 diffusion-encoding directions. The price to pay for such reduced acquisition is an increment in the variability of the data and a subestimation of the metric on those tracts not aligned with the acquired directions. Nevertheless, the calculation of anisotropy information from DMRI is feasible using fewer than 6 gradient directions by using DiA. The method is totally compatible with existing acquisition protocols, and it may provide complementary information about orientation in fast diffusion acquisitions.
Ministerio de Ciencia e Innovación (grant RTI2018-094569-B-I00)
Wellcome Trust Investigator Award (award 096646/Z/11/Z)
Wellcome Trust Strategic Award (award 104943/Z/14/Z)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2022 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Anisotropy
Anisotropía
Brain
Cerebro
Anisotropy measure from three diffusion-encoding gradient directions
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0730725X22000145?via%3Dihub
SI
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Anisotropy-measure.pdf.jpg
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LICENSE
license.txt
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oai:uvadoc.uva.es:10324/52106
2022-09-30 12:48:03.16
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/523182022-03-09T21:49:47Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Dadashzadeh, Mojtaba
aa2b8a5c-dedc-4742-a4e3-0c86e1802313
600
Abbaspour Gilandeh, Yousef
b3fd3630-e731-45ce-9abf-aaa00ee94163
600
Mesri Gundoshmian, Tarahom
b5207ed2-e486-4764-9eba-2ae51c3a1d2f
600
Sabzi, Sajad
fd8670e7-c55f-456a-b4dc-265cd45c3417
600
Hernández Hernández, José Luis
ddaa2486-287f-4098-82b3-a943b1d825b5
600
Hernández Hernández, Mario
38ca113d-82a8-45ef-85a2-7581cee55cfd
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
2022-03-09T09:05:33Z
2022-03-09T09:05:33Z
2020
Plants, 2020, vol. 9, n. 5, 559
2223-7747
https://uvadoc.uva.es/handle/10324/52318
10.3390/plants9050559
Producción Científica
Site-specific weed management and selective application of herbicides as eco-friendly techniques are still challenging tasks to perform, especially for densely cultivated crops, such as rice. This study is aimed at developing a stereo vision system for distinguishing between rice plants and weeds and further discriminating two types of weeds in a rice field by using artificial neural networks (ANNs) and two metaheuristic algorithms. For this purpose, stereo videos were recorded across the rice field and different channels were extracted and decomposed into the constituent frames. Next, upon pre-processing and segmentation of the frames, green plants were extracted out of the background. For accurate discrimination of the rice and weeds, a total of 302 color, shape, and texture features were identified. Two metaheuristic algorithms, namely particle swarm optimization (PSO) and the bee algorithm (BA), were used to optimize the neural network for selecting the most effective features and classifying different types of weeds, respectively. Comparing the proposed classification method with the K-nearest neighbors (KNN) classifier, it was found that the proposed ANN-BA classifier reached accuracies of 88.74% and 87.96% for right and left channels, respectively, over the test set. Taking into account either the arithmetic or the geometric means as the basis, the accuracies were increased up to 92.02% and 90.7%, respectively, over the test set. On the other hand, the KNN suffered from more cases of misclassification, as compared to the proposed ANN-BA classifier, generating an overall accuracy of 76.62% and 85.59% for the classification of the right and left channel data, respectively, and 85.84% and 84.07% for the arithmetic and geometric mean values, respectively.
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Sustainable agriculture
Agricultura sostenible
Eco-friendly techniques
Técnicas ecológicas
Weed Classification for Site-Specific Weed Management Using an Automated Stereo Computer-Vision Machine-Learning System in Rice Fields
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2223-7747/9/5/559/htm
SI
THUMBNAIL
Weed-classification.pdf.jpg
Weed-classification.pdf.jpg
IM Thumbnail
image/jpeg
3368
https://uvadoc.uva.es/bitstream/10324/52318/4/Weed-classification.pdf.jpg
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MD5
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LICENSE
license.txt
license.txt
text/plain
3930
https://uvadoc.uva.es/bitstream/10324/52318/3/license.txt
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MD5
3
CC-LICENSE
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license_rdf
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https://uvadoc.uva.es/bitstream/10324/52318/2/license_rdf
975848b171c53b753f7e445c8b5bc0e1
MD5
2
ORIGINAL
Weed-classification.pdf
Weed-classification.pdf
application/pdf
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https://uvadoc.uva.es/bitstream/10324/52318/1/Weed-classification.pdf
ab7c41730a928d6800398b5fcd7f1317
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10324/52318
oai:uvadoc.uva.es:10324/52318
2022-03-09 22:49:47.439
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/523642022-07-18T09:32:59Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Rosa Steinz, Ramón de la
10dc23efb883eec2
600
0000-0002-7857-3664
Carrera, Albano
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500
Alonso Alonso, Alonso
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600
0000-0001-6156-0173
Peñasco Martín, Benito
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500
Gil Agudo, Angel
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500
Abril Domingo, Evaristo José
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600
0000-0003-4164-2467
2022-03-10T09:11:38Z
2022-03-10T09:11:38Z
2019
Applied Sciences, 2019, vol. 9, n. 9, p.1912.
2076-3417
https://uvadoc.uva.es/handle/10324/52364
10.3390/app9091912
1912
9
Applied Sciences
9
2076-3417
Producción Científica
This paper analyses the role of myoelectric games in the rehabilitation of paraplegic patients. The University of Valladolid neuromuscular training system, UVa-NTS platform, which allows the myoelectric command of computer applications, has been introduced in rehabilitation sessions of a group of paraplegic patients. The experiments took place both at the University of Valladolid and at the National Hospital for Paraplegics of Toledo in Spain. A homogeneous population of five patients with a C7 spinal cord injury was compared with a group of control subjects. The myoelectric control was performed with the flexor carpi radialis and the extensor carpi radialis muscles. The myoelectric routines were timed and the game scores measured. Notwithstanding the reduced mobility of the patients, they achieved fast adaptation and better timings than the control subjects in the first experiment (p < 0.001), although this difference was reduced in further experiments. Both patients and control subjects played satisfactorily with the Myo-Pong game. However, the improvement in the scores was better for the control subjects between sessions (p = 0.009) when compared with the patients (p = 0.978). The results show that patients and control subjects were able to perform and reached similar scores. However, patients’ improvement in further rehabilitation sessions was lesser than when compared with the control subjects.
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2019 The Authors
Atribución 4.0 Internacional
Spinal cord injury
Rehabilitation
Electromyography
Myoelectric control
Biofeedback
33 Ciencias Tecnológicas
32 Ciencias Médicas
Myoelectric gaming in the rehabilitation of patients with C7 spinal cord injury
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2076-3417/9/9/1912
SI
THUMBNAIL
Myoelectric-gaming-rehabilitation.pdf.jpg
Myoelectric-gaming-rehabilitation.pdf.jpg
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image/jpeg
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LICENSE
license.txt
license.txt
text/plain
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https://uvadoc.uva.es/bitstream/10324/52364/3/license.txt
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CC-LICENSE
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ORIGINAL
Myoelectric-gaming-rehabilitation.pdf
Myoelectric-gaming-rehabilitation.pdf
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https://uvadoc.uva.es/bitstream/10324/52364/1/Myoelectric-gaming-rehabilitation.pdf
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10324/52364
oai:uvadoc.uva.es:10324/52364
2022-07-18 11:32:59.976
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/524502022-03-15T21:47:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Awad Mutlag, Ammar
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600
Abd Ghani, Mohd Khanapi
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Mohammed, Mazin Abed
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Maashi, Mashael S.
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600
Mohd, Othman
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600
Mostafa, Salama
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600
Abdulkareem, Karrar Hameed
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600
Marques, Gonçalo
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Torre Díez, Isabel de la
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0000-0003-3134-7720
2022-03-15T09:36:13Z
2022-03-15T09:36:13Z
2020
Sensors, 2020, vol. 20, n. 7, 1853
1424-8220
https://uvadoc.uva.es/handle/10324/52450
10.3390/s20071853
Producción Científica
In healthcare applications, numerous sensors and devices produce massive amounts of data which are the focus of critical tasks. Their management at the edge of the network can be done by Fog computing implementation. However, Fog Nodes suffer from lake of resources That could limit the time needed for final outcome/analytics. Fog Nodes could perform just a small number of tasks. A difficult decision concerns which tasks will perform locally by Fog Nodes. Each node should select such tasks carefully based on the current contextual information, for example, tasks’ priority, resource load, and resource availability. We suggest in this paper a Multi-Agent Fog Computing model for healthcare critical tasks management. The main role of the multi-agent system is mapping between three decision tables to optimize scheduling the critical tasks by assigning tasks with their priority, load in the network, and network resource availability. The first step is to decide whether a critical task can be processed locally; otherwise, the second step involves the sophisticated selection of the most suitable neighbor Fog Node to allocate it. If no Fog Node is capable of processing the task throughout the network, it is then sent to the Cloud facing the highest latency. We test the proposed scheme thoroughly, demonstrating its applicability and optimality at the edge of the network using iFogSim simulator and UTeM clinic data.
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2020 The Authors
Atribución 4.0 Internacional
Fog computing
Computación en niebla
MAFC: Multi-Agent Fog Computing Model for Healthcare Critical Tasks Management
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/1424-8220/20/7/1853
SI
THUMBNAIL
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oai:uvadoc.uva.es:10324/52450
2022-03-15 22:47:37.393
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/525132022-04-19T20:48:06Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Chamorro Posada, Pedro
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600
0000-0002-0199-0558
Dante, Roberto C.
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600
Vázquez Cabo, José
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600
Dante, Denisse G.
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600
Martín Ramos, Pablo
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600
Rubiños López, Óscar
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600
Sánchez Arévalo, Francisco M.
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2022-03-16T13:06:58Z
2022-03-16T13:06:58Z
2022
Journal of Solid State Chemistry, 2022, vol. 310, 123071
0022-4596
https://uvadoc.uva.es/handle/10324/52513
10.1016/j.jssc.2022.123071
Producción Científica
This work presents a survey of the intermediates in the well-known thermal synthesis of graphitic carbon nitride from urea. The analysis of the crystalline phases depicts a successive transformation of the precursor into different substances previously used as starting reactants, whereby melamine cyanurate arises as the ultimate precursor of a class of thermal condensation routes to obtain graphitic carbon nitride. The study of the optical properties of the synthesized materials evidences the simultaneous production of an amorphous phase with a significant presence of melon oligomers. These results are also supported by the further characterization of the materials performed using THz-TDS, FT-IR, HRTEM, and XPS techniques, and by theoretical studies conducted using semi-empirical quantum chemistry methods.
Junta de Castilla y León (grant VA296P18)
Ministerio de Ciencia, Innovación y Universidades (grant PID2020-320 119418GB-I00)
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2022 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Carbon nitride
Nitruro de carbono
Luminescence properties
Propiedades luminiscentes
Melamine cyanurate
Cianurato de melamina
From urea to melamine cyanurate: Study of a class of thermal condensation routes for the preparation of graphitic carbon nitride
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0022459622001955?via%3Dihub
SI
THUMBNAIL
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Urea-melamine-cyanurate.pdf
Urea-melamine-cyanurate.pdf
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2022-04-19 22:48:06.148
UVaDOC
repositorio@uva.es
oai:uvadoc.uva.es:10324/525292022-07-18T09:33:00Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Villarreal, Vladimir
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500
Castillo Sánchez, Gema Anabel
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600
Hamrioui, Sofiane
a77ec7f6-95e7-4349-aea7-1d0a352a3bdf
500
Berbey Álvarez, Aránzazu
83cabad6-cce2-4875-a6ec-1da4a0b86ca2
600
Torre Díez, Isabel de la
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600
0000-0003-3134-7720
Lorenz, Pascal
e454c132-91ca-4a76-84e4-56ed0f336f88
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2022-03-17T09:01:38Z
2022-03-17T09:01:38Z
2018
Proceedings, 2018, vol. 2, n. 19, p. 481
2504-3900
https://uvadoc.uva.es/handle/10324/52529
10.3390/proceedings2190481
481
19
Proceedings
2
Producción Científica
Currently, with the widespread penetration of mobile devices with Internet access, including the smartphones, they can allow specific and/or complementary activities in the health field as well as in other commercial sectors. To verify the impact of the studies about medical scientific publications relatives to cardiac mobile applications (app). This review corresponds to information in scientific journals of high impact. The intention of this review is respond to the follow question: How these research works have evaluated the performance of health mobile applications, with a special interest in cardiac issues? This review of these searches corresponds to an analysis by 4 categories, which are: Assessment of the wearables—Body Care, Use of sensors in the applications, app in health, Health Care—Comparisons of review app and app specialized commercial/clinical use. Only 6% of the app are associated with a medical professional, 15% is published by a professional medical society and 63% according to the opinions of the user. It provides evidence of how some apps have been evaluated, and in some cases the effectiveness of the estimated accuracy is not in line with the real situation. In Panama, a platform has been presented that permit the integration of health applications for patient follow-up. AmI-HEALTH has been developed to provide a mechanism for self-management of hypertensive patient data, by re-cording elements such as blood pressure (systolic, diastolic and pulse). In this point is very important to remember to the near relation between the Cardiac Issues and the hypertension condition. This makes us reflect on the true implications that bring us closer to these technological innovations. Today, our world is so changing and globalized.
Secretaría Nacional de Ciencia, Tecnología e Innovación (SENACYT) and development by Technological University of Panama (Project ITE15-001)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2018 The Authors
Atribución 4.0 Internacional
Hypertension solution
Cardiac applications
Heart rate monitoring
Mobile health development
Wearables technologies
33 Ciencias Tecnológicas
32 Ciencias Médicas
A systematic review of mHealth apps evaluations for cardiac issues
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2504-3900/2/19/481
SI
THUMBNAIL
A-systematic-review.pdf.jpg
A-systematic-review.pdf.jpg
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LICENSE
license.txt
license.txt
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2022-07-18 11:33:00.186
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/526032022-03-23T21:53:27Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Marques, Gonçalo
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Miranda, Nuno
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Bhoi, Akash Kumar
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600
Garcia Zapirain, Begonya
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600
Hamrioui, Sofiane
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Torre Díez, Isabel de la
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0000-0003-3134-7720
2022-03-23T10:31:46Z
2022-03-23T10:31:46Z
2020
Sensors, 2020, vol. 20, n. 3, 720
1424-8220
https://uvadoc.uva.es/handle/10324/52603
10.3390/s20030720
Producción Científica
This paper presents a real-time air quality monitoring system based on Internet of Things. Air quality is particularly relevant for enhanced living environments and well-being. The Environmental Protection Agency and the World Health Organization have acknowledged the material impact of air quality on public health and defined standards and policies to regulate and improve air quality. However, there is a significant need for cost-effective methods to monitor and control air quality which provide modularity, scalability, portability, easy installation and configuration features, and mobile computing technologies integration. The proposed method allows the measuring and mapping of air quality levels considering the spatial-temporal information. This system incorporates a cyber-physical system for data collection and mobile computing software for data consulting. Moreover, this method provides a cost-effective and efficient solution for air quality supervision and can be installed in vehicles to monitor air quality while travelling. The results obtained confirm the implementation of the system and present a relevant contribution to enhanced living environments in smart cities. This supervision solution provides real-time identification of unhealthy behaviours and supports the planning of possible interventions to increase air quality.
Ministerio de Industria, Energía y Turismo - Unión Europea (project AAL-20125036)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2020 The Authors
Atribución 4.0 Internacional
Air quality
Aire - Calidad
Mobile computing
Computación móvil
Internet of things and enhanced living environments: measuring and mapping air quality using cyber-physical systems and mobile computing technologies
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/1424-8220/20/3/720
SI
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Internet-things-enhanced-living-environments.pdf.jpg
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license.txt
license.txt
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Internet-things-enhanced-living-environments.pdf
Internet-things-enhanced-living-environments.pdf
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oai:uvadoc.uva.es:10324/52603
2022-03-23 22:53:27.647
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/526202022-03-24T21:47:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Sabzi, Sajad
fd8670e7-c55f-456a-b4dc-265cd45c3417
600
Pourdarbani, Razieh
cf1e2d1a-46ac-49f6-80ac-2e3848c9831c
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
2022-03-24T09:09:31Z
2022-03-24T09:09:31Z
2020
Computers, 2020, vol. 9, n. 1, 6
2073-431X
https://uvadoc.uva.es/handle/10324/52620
10.3390/computers9010006
Producción Científica
A computer vision system for automatic recognition and classification of five varieties of plant leaves under controlled laboratory imaging conditions, comprising: 1–Cydonia oblonga (quince), 2–Eucalyptus camaldulensis dehn (river red gum), 3–Malus pumila (apple), 4–Pistacia atlantica (mt. Atlas mastic tree) and 5–Prunus armeniaca (apricot), is proposed. 516 tree leaves images were taken and 285 features computed from each object including shape features, color features, texture features based on the gray level co-occurrence matrix, texture descriptors based on histogram and moment invariants. Seven discriminant features were selected and input for classification purposes using three classifiers: hybrid artificial neural network–ant bee colony (ANN–ABC), hybrid artificial neural network–biogeography based optimization (ANN–BBO) and Fisher linear discriminant analysis (LDA). Mean correct classification rates (CCR), resulted in 94.04%, 89.23%, and 93.99%, for hybrid ANN–ABC; hybrid ANN–BBO; and LDA classifiers, respectively. Best classifier mean area under curve (AUC), mean sensitivity, and mean specificity, were computed for the five tree varieties under study, resulting in: 1–Cydonia oblonga (quince) 0.991 (ANN–ABC), 95.89% (ANN–ABC), 95.91% (ANN–ABC); 2–Eucalyptus camaldulensis dehn (river red gum) 1.00 (LDA), 100% (LDA), 100% (LDA); 3–Malus pumila (apple) 0.996 (LDA), 96.63% (LDA), 94.99% (LDA); 4–Pistacia atlantica (mt. Atlas mastic tree) 0.979 (LDA), 91.71% (LDA), 82.57% (LDA); and 5–Prunus armeniaca (apricot) 0.994 (LDA), 88.67% (LDA), 94.65% (LDA), respectively.
Unión Europea (project 585596-EPP-1-2017-1-DE-EPPKA2-CBHE-JP)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2020 The Authors
Atribución 4.0 Internacional
Computer vision
Visión artificial
Neural networks
Redes neuronales
Precision agriculture
Agricultura de precisión
A computer vision system for the automatic classification of five varieties of tree leaf images
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2073-431X/9/1/6
SI
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license.txt
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Computer-vision-system.pdf
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2022-03-24 22:47:52.387
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/526282022-03-24T21:47:55Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Pourdarbani, Razieh
cf1e2d1a-46ac-49f6-80ac-2e3848c9831c
600
Sabzi, Sajad
fd8670e7-c55f-456a-b4dc-265cd45c3417
600
Kalantari, Davood
0470f789-a493-41da-b12a-d65cf5f1f31b
600
Hernández Hernández, José Luis
ddaa2486-287f-4098-82b3-a943b1d825b5
600
Arribas Sánchez, Juan Ignacio
25df7221f705fcf7
600
0000-0002-7486-6152
2022-03-24T10:17:52Z
2022-03-24T10:17:52Z
2020
Foods, 2020, vol. 9, n. 2, 113
2304-8158
https://uvadoc.uva.es/handle/10324/52628
10.3390/foods9020113
Producción Científica
Since different varieties of crops have specific applications, it is therefore important to properly identify each cultivar, in order to avoid fake varieties being sold as genuine, i.e., fraud. Despite that properly trained human experts might accurately identify and classify crop varieties, computer vision systems are needed since conditions such as fatigue, reproducibility, and so on, can influence the expert’s judgment and assessment. Chickpea (Cicer arietinum L.) is an important legume at the world-level and has several varieties. Three chickpea varieties with a rather similar visual appearance were studied here: Adel, Arman, and Azad chickpeas. The purpose of this paper is to present a computer vision system for the automatic classification of those chickpea varieties. First, segmentation was performed using an Hue Saturation Intensity (HSI) color space threshold. Next, color and textural (from the gray level co-occurrence matrix, GLCM) properties (features) were extracted from the chickpea sample images. Then, using the hybrid artificial neural network-cultural algorithm (ANN-CA), the sub-optimal combination of the five most effective properties (mean of the RGB color space components, mean of the HSI color space components, entropy of GLCM matrix at 90°, standard deviation of GLCM matrix at 0°, and mean third component in YCbCr color space) were selected as discriminant features. Finally, an ANN-PSO/ACO/HS majority voting (MV) ensemble methodology merging three different classifier outputs, namely the hybrid artificial neural network-particle swarm optimization (ANN-PSO), hybrid artificial neural network-ant colony optimization (ANN-ACO), and hybrid artificial neural network-harmonic search (ANN-HS), was used. Results showed that the ensemble ANN-PSO/ACO/HS-MV classifier approach reached an average classification accuracy of 99.10 ± 0.75% over the test set, after averaging 1000 random iterations.
Unión Europea (project 585596-EPP-1-2017-1-DE-EPPKA2-CBHE-JP)
application/pdf
eng
MDPI
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Chickpeas
Garbanzos
Computer vision
Visión artificial
Image processing
Procesamiento de imágenes
A computer vision system based on majority-voting ensemble neural network for the automatic classification of three chickpea varieties
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.mdpi.com/2304-8158/9/2/113
SI
THUMBNAIL
Computer-vision-system-based.pdf.jpg
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Computer-vision-system-based.pdf
Computer-vision-system-based.pdf
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oai:uvadoc.uva.es:10324/52628
2022-03-24 22:47:55.367
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/528212022-08-24T09:01:11Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ruiz Pérez, Lidia
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600
0000-0001-6241-5998
Durán Barroso, Ramón José
72e6ffac37e460e9
600
0000-0003-1423-1646
Miguel Jiménez, Ignacio de
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600
0000-0002-1084-1159
Merayo Álvarez, Noemí
fe9385c725979c89
600
0000-0002-6920-0778
Aguado Manzano, Juan Carlos
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600
0000-0002-2495-0313
Abril Domingo, Evaristo José
e4e2ea80f96dd812
600
0000-0003-4164-2467
2022-04-19T07:02:22Z
2022-04-19T07:02:22Z
2021
IEEE Access, 2021, vol. 9. p. 111633-111650
2169-3536
https://uvadoc.uva.es/handle/10324/52821
10.1109/ACCESS.2021.3101998
Producción Científica
Elastic Optical Networks (EONs) are a promising optical technology to deal with the ever-increasing traffic and the vast number of connected devices of the next generation of the Internet, associated to paradigms like the Internet of Things (IoT), the Tactile Internet or the Industry 4.0, to name just a few. In this kind of optical network, each optical circuit or lightpath is provisioned by means of superchannels of variable bandwidth. In this manner, only the necessary bandwidth to accommodate the demand is allocated, improving the spectrum usage. When establishing a connection, the EON control layer determines the modulation format to be used and allocates a portion of the spectrum in a sequence of fibers from the source to the destination node providing the user-demanded bandwidth. This is known as the routing, modulation level and spectrum assignment (RMSA) problem. In this work, we firstly review the most important contributions in that area, and then, we propose a novel RMSA algorithm, multi-path best-fit (MP-BF), which uses a split spectrum multi-path strategy together with a spectrum assignment technique (best-fit), and which jointly exploit the flexibility of EONs. A simulation study has been conducted comparing the performance of EONs when using MP-BF with other proposals from the literature. The results of this study show that, by using MP-BF, the network can increase its performance in terms of lightpath request blocking ratio and supported traffic load, without affecting the energy per bit or the computation time required to find a solution.
application/pdf
eng
IEEE Xplore
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2021 IEEE Xplore
Atribución 4.0 Internacional
Optical networks
Redes ópticas
Routing, modulation and spectrum assignment algorithm using multi-path routing and best-fit
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ieeexplore.ieee.org/document/9503371
SI
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2022-08-24 11:01:11.569
UVaDOC
repositorio@uva.es
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oai:uvadoc.uva.es:10324/528222022-04-19T20:48:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Merayo Álvarez, Noemí
fe9385c725979c89
600
0000-0002-6920-0778
Pintos, David de
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600
Aguado Manzano, Juan Carlos
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600
0000-0002-2495-0313
Miguel Jiménez, Ignacio de
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600
0000-0002-1084-1159
Durán Barroso, Ramón José
72e6ffac37e460e9
600
0000-0003-1423-1646
Fernández Reguero, Patricia
99d11cf6950c28bc
600
0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
2d213aefd2a0fae2
600
0000-0001-8729-3085
Abril Domingo, Evaristo José
e4e2ea80f96dd812
600
0000-0003-4164-2467
2022-04-19T07:17:52Z
2022-04-19T07:17:52Z
2021
Optical Switching and Networking, 2021, vol. 42, 100631
1573-4277
https://uvadoc.uva.es/handle/10324/52822
10.1016/j.osn.2021.100631
Producción Científica
We propose, and experimentally demonstrate, an SDN (Software Defined Networking) new management solution for legacy GPONs (Gigabit Passive Optical Networks), which allows users to dynamically control their residential networks by means of a management application. In this way, users can customize the allocation of resources (and set constraints, if desired) to connected devices in their residential network, fast and efficiently. This real-time customization enables new business models for network operators and service providers. As a proof of concept and to validate the management solution, we demonstrate, in a testbed environment, the operation of a dynamic network scenario where an operator has a business model in which users have a contracted basic bandwidth, but they are allowed to increase it temporarily when using highly demanding services.
Junta de Castilla y León (project VA085G19)
Ministerio de Ciencia, Innovación y Universidades (projects TEC2017-84423-C3-1-P and RED2018-102585-T)
INTERREG V-A España-Portugal (POCTEP) program (project 0677_DISRUPTIVE_2_E).
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 The Authors
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Optical networks
Redes ópticas
Software defined networking
Redes definidas por software
Experimental validation of an SDN residential network management proposal over a GPON testbed
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S157342772100028X?via%3Dihub
SI
THUMBNAIL
Experimental-validation-SDN.pdf.jpg
Experimental-validation-SDN.pdf.jpg
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LICENSE
license.txt
license.txt
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https://uvadoc.uva.es/bitstream/10324/52822/3/license.txt
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ORIGINAL
Experimental-validation-SDN.pdf
Experimental-validation-SDN.pdf
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oai:uvadoc.uva.es:10324/52822
2022-04-19 22:48:17.351
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repositorio@uva.es
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oai:uvadoc.uva.es:10324/528242022-04-19T20:48:22Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Asensio, Adrián
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600
Masip-Bruin, Xavi
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Durán Barroso, Ramón José
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0000-0003-1423-1646
Miguel Jiménez, Ignacio de
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600
0000-0002-1084-1159
Ren, Guang-Jie
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600
Daijavad, Shahrokh
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Jukan, Admela
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2022-04-19T08:02:33Z
2022-04-19T08:02:33Z
2020
Future Generation Computer Systems, 2020, vol. 109, p. 392-406
0167-739X
https://uvadoc.uva.es/handle/10324/52824
10.1016/j.future.2020.03.056
Producción Científica
The evolution of the Internet of Things (IoT) is imposing many distinct challenges, particularly to guarantee both wide and global systems communication, and to ensure an optimal execution of services. To that end, IoT services must make the most out of both cloud and fog computing (turning into combined fog–cloud scenarios), which indeed requires novel and efficient resource management procedures to handle such diversity of resources in a coordinated way. Most of the related works that can be found in the literature focus on resource mapping for service-specific execution in fog–cloud; however, those works assume a control and management architecture already deployed. Interestingly, few works propose algorithms to set that control architecture, necessary to execute the services and effectively implement services and resource mapping. This paper addresses that challenge by solving the problem of optimal clustering of devices located at the edge of the network offering their resources to support fog computing while defining the control and management role of each of them in the architecture, in order to ensure access to management functions in combined fog–cloud scenarios. In particular, we set out the Fog–Cloud Clustering (FCC) problem as an optimization problem, which is based on multi-objective optimization, including realistic, novel and stringent constraints; e.g., to improve the architecture’s robustness by means of a device acting as a backup in the cluster. We model the FCC problem as a Mixed Integer Linear Programming (MILP) formulation, for which a lower and an upper bound on the number of required clusters is derived. We also propose a machine learning-based heuristic that provides scalable and near-optimal solutions in realistic scenarios in which, due to the high number of connected devices, solving the MILP formulation is not viable. By means of a simulation study, we demonstrate the effectiveness of the algorithms comparing its results with those of MILP formulation.
Spanish Thematic Networks (contracts RED2018-102585-T and TEC2015-71932-REDT)
Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (projects RTI2018-094532-B-I00 and TEC2017-84423-C3-1-P)
INTERREG V-A España-Portugal (POCTEP) program (project 0677_DISRUPTIVE_2_E).
application/pdf
eng
Elsevier
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Machine learning
Aprendizaje automático
Designing an efficient clustering strategy for combined Fog-to-Cloud scenarios
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://www.sciencedirect.com/science/article/pii/S0167739X19329541?via%3Dihub
info:eu-repo/grantAgreement/EC/H2020/730929
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2022-04-19 22:48:22.273
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oai:uvadoc.uva.es:10324/528252022-04-19T20:48:25Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Ruiz Pérez, Lidia
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Durán Barroso, Ramón José
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0000-0003-1423-1646
Miguel Jiménez, Ignacio de
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0000-0002-1084-1159
Merayo Álvarez, Noemí
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0000-0002-6920-0778
Aguado Manzano, Juan Carlos
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0000-0002-2495-0313
Rosa Steinz, Ramón de la
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600
0000-0002-7857-3664
Fernández Reguero, Patricia
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0000-0001-5520-0948
Lorenzo Toledo, Rubén Mateo
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Abril Domingo, Evaristo José
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0000-0003-4164-2467
2022-04-19T08:26:25Z
2022-04-19T08:26:25Z
2020
IEEE Access, 2020, vol. 8. p. 55893 - 55904
2169-3536
https://uvadoc.uva.es/handle/10324/52825
10.1109/ACCESS.2020.2982018
Producción Científica
Next generation of Internet of Things (IoT) services imposes stringent requirements to the future networks that current ones cannot fulfill. 5G is a technology born to give response to those requirements. However, the deployment of 5G is also accompanied by profound architectural changes in the network, including the introduction of technologies like multi-access edge computing (MEC), software defined networking (SDN), and network function virtualization (NFV). In particular, NFV poses diverse challenges like virtual network function (VNF) placement and chaining, also called VNF-mapping. In this paper, we present an algorithm that solves VNF-placement and chaining in a metro WDM optical network equipped with MEC resources. Therefore, it solves the VNF-mapping in conjunction with the virtual topology design of the underlying optical backhaul network. Moreover, a version of the method providing protection against node failures is also presented. A simulation study is presented to show the importance of designing the three problems jointly, in contrast to other proposals of the literature that do not take the design of the underlying network into consideration when solving that problem. Furthermore, this paper also shows the advantages of using collaboration between MEC nodes to solve the VNF-mapping problem and the advantage of using shared protection schemes. The new algorithm outperforms other proposals in terms of both service blocking ratio, and number of active CPUs (thus reducing energy consumption). Finally, the impact of deploying different physical topologies for the optical backhaul network is also presented.
Ministerio de Economía, Industria y Competitividad (grant TEC2017-84423-C3-1-P)
Ministerio de Industria, Comercio y Turismo (grant BES 2015-074514)
Spanish Thematic Network (contract RED2018-102585-T)
INTERREG V-A España-Portugal (POCTEP) program (project 0677_DISRUPTIVE_2_E)
application/pdf
eng
IEEE Xplore
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2020 IEEE Xplore
Atribución 4.0 Internacional
Optical networks
Redes ópticas
Genetic algorithm for holistic VNF-mapping and virtual topology design
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ieeexplore.ieee.org/document/9042229
SI
THUMBNAIL
Genetic-algorithm-holistic-VNF-mapping.pdf.jpg
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Genetic-algorithm-holistic-VNF-mapping.pdf
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2022-04-19 22:48:25.898
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oai:uvadoc.uva.es:10324/528402022-04-20T23:59:31Zcom_10324_1191com_10324_931com_10324_894col_10324_1379
Flores Moyano, Ricardo
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600
Fernández Cambronero, David
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Merayo Álvarez, Noemí
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600
0000-0002-6920-0778
Lentisco, Carlos M.
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600
Cárdenas, Andrés
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2022-04-20T06:56:37Z
2022-04-20T06:56:37Z
2020
IEEE Access, 2020, vol. 8. p. 34038 - 34055
2169-3536
https://uvadoc.uva.es/handle/10324/52840
10.1109/ACCESS.2020.2974504
Producción Científica
Residential networks play a critical role in assuring that services or applications such as tele-work, tele-education, medical care, entertainment, home automation, among others, have the required resources to obtain an optimal performance. Although current residential gateways try to meet the Quality of Service (QoS) demands, the traditional networking paradigm does not have the appropriate mechanisms to address the heterogeneous and dynamic nature of the services running at home. In this context, a feasible solution consists of leveraging the flexibility and adaptability of the Software Defined Networking (SDN) and Network Functions Virtualization (NFV) paradigms to provide a differentiated traffic treatment intended to improve the QoS support of residential networks. The proposal takes advantage of the Service Function Chaining (SFC) concept intrinsic to NFV as well as the capacity of an SDN-based residential gateway to differentiate the traffic of a certain application. Thus, an association between an SFC and the differentiated traffic is stablished to apply a specific treatment. Besides, a comprehensive architecture composed of the software defined residential network (SDRN), the software defined access network (SDOAN) and the NFV-compliant ISP's edge cloud infrastructure is envisioned. This architecture would allow dramatically improving the life cycle management of the residential network from a centralized point which follows a user-centric approach.
Ministerio de Ciencia, Innovación y Universidades (grants TEC2015-67834-R, TEC2017-84423-C3-1-P, RED2018-102585-T and 0677_DISRUPTIVE_2_E)
application/pdf
eng
IEEE Xplore
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
© 2020 IEEE Xplore
Atribución 4.0 Internacional
Residential networks
Redes residenciales
NFV and SDN-based differentiated traffic treatment for residential networks
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://ieeexplore.ieee.org/document/9000891
SI
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UVaDOC
repositorio@uva.es
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LCAKcG9yIGluY3VtcGxpbWllbnRvIGRlIGN1YWxxdWllcmEgZGUgbGFzIG9ibGlnYWNpb25lcyBkZXJpdmFkYXMgZGVsIEFjdWVyZG8sIHBvciB2b2x1bnRhZCBleHByZXNhIGRlbCBBdXRvcgpFbiAgcHJ1ZWJhIGRlIGNvbmZvcm1pZGFkLCBsYXMgcGFydGVzIGFjZXB0YW4gZWwgcHJlc2VudGUgQWN1ZXJkbwoKCgoK
xoai///col_10324_1379/100