2024-03-29T07:36:08Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/163512021-09-14T07:02:51Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Modelo Cognitivo para la Docencia de Diseño de Redes mediante un Sistema de E-learning Inteligente
Verdú Pérez, Elena
Regueras Santos, Luisa María
Verdú Pérez, María Jesús
Castro Fernández, Juan Pablo de
Este artículo presenta un modelo cognitivo para la docencia de la asignatura {“Laboratorio} de Diseño y Configuración de Redes” que se imparte en la Universidad de Valladolid. El modelo se propone dentro del contexto del proyecto {INTUITEL} (Intelligent Tutoring Interface for Technology Enhanced Learning), un proyecto co-financiado por la Comisión Europea, cuyo objetivo es mejorar los sistemas de e-learning con el fin de que éstos sean capaces de ofrecer caminos de aprendizaje adaptados a las características y necesidades de los estudiantes.
2016-03-01T12:32:46Z
2016-03-01T12:32:46Z
2016-03-01T12:32:46Z
2013
info:eu-repo/semantics/conferenceObject
XI Jornadas de Ingeniería Telemática (JITEL 2013). Libro de ponencias, Jesús E. Díaz Verdejo, Jorge Navarro Ortiz, Juan J. Ramos Muñoz (Eds.), Universidad de Granada, 2013, pp. 503-508, 2013.
978-84-616-5597-7
http://uvadoc.uva.es/handle/10324/16351
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-sa/4.0/
Attribution-ShareAlike 4.0 International
Universidad de Granada
oai:uvadoc.uva.es:10324/213732021-06-23T13:29:10Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Bucket-Server: A System for Including Teacher-Controlled Flexibility in the Management of Learning Artifacts in Across-Spaces Learning Situations
Muñoz Cristóbal, Juan Alberto
Asensio Pérez, Juan Ignacio
Martínez Monés, Alejandra
Prieto, Luis P.
Jorrín Abellán, Iván Manuel
Dimitriadis Damoulis, Ioannis
Realidad virtual
Recent technological advances in mobile devices enable the connec-tion of classrooms with other virtual and physical spaces. Some approaches aim at helping teachers carry out learning situations across such spaces. However, these proposals tend to be isolated from other activities in teachers’ current common practices, and do not allow teacher-controlled flexibility of what stu-dents do during the enactment. Aiming to overcome such limitations, the Buck-et-Server is a system that enables teachers to include learning buckets in their learning situations: containers of learning artifacts generated and/or consumed across-spaces by students during the enactment. Teachers create learning buck-ets at design time, configuring them with constraints to regulate the degree of freedom offered to the students. These learning buckets can be integrated into multiple existing technologies used in different educational spaces (e.g., web, physical and 3D virtual world spaces), thus helping embed buckets in the teach-ers’ current common practices.
2016-11-30T14:06:23Z
2016-11-30T14:06:23Z
2016-11-30T14:06:23Z
2015
info:eu-repo/semantics/conferenceObject
Muñoz-Cristóbal, J. A., Asensio-Pérez, J. I., Martínez-Monés, A., Prieto, L. P., Jorrín-Abellán, I. M., & Dimitriadis, Y. (2015). Bucket-Server: A System for Including Teacher-Controlled Flexibility in the Management of Learning Artifacts in Across-Spaces Learning Situations. In Proceedings of the 10th European Conference on Technology-Enhanced Learning (EC-TEL 2015). Toledo (Spain), September 2015, pp. 518-52.
978-3-319-24258-3
http://uvadoc.uva.es/handle/10324/21373
http://dx.doi.org/10.1007/978-3-319-24258-3_50
eng
http://ea-tel.eu/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/213752021-06-23T13:29:04Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Orchestrating learning across spaces: Integrating heterogeneous technologies of the existing educational practice
Muñoz Cristóbal, Juan Alberto
Asensio Pérez, Juan Ignacio
Martínez Monés, Alejandra
Dimitriadis Damoulis, Ioannis
Realidad virtual
Several approaches provide solutions for orchestrating across-spaces learning situations involving heterogeneous technologies. However, the learning situations that such systems support tend to be isolated from other activities and ICT tools of the teachers’ existing practice. We present some lessons learned during our research in the field, which can be used as guidelines to design systems for the orchestration of across-spaces settings that integrate multiple technologies already in use by teachers.
2016-12-01T08:09:48Z
2016-12-01T08:09:48Z
2016-12-01T08:09:48Z
2015
info:eu-repo/semantics/conferenceObject
Muñoz-Cristóbal, J.A., Asensio-Pérez, J.I., Martínez-Monés, A., Dimitriadis, Y. (2015). Orchestrating learning across spaces: Integrating heterogeneous technologies of the existing educational practice. Proceedings of the Orchestrated Collaborative Classroom Workshop 2015 co-located with 11th International Conference on Computer Supported Collaborative Learning (CSCL 2015). Gothenburg, Sweden, June 7, 2015.
http://uvadoc.uva.es/handle/10324/21375
eng
http://ceur-ws.org/Vol-1411/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/213772021-06-23T13:29:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
The Orchestrated Collaborative Classroom: Designing and Making Sense of Heterogeneous Ecologies of Teaching and Learning Resources
Prieto, Luis P.
Dimitriadis Damoulis, Ioannis
Harrer, Andreas
Milrad, Marcelo
Nussbaum, Miguel
Slotta, James D.
Tecnología educativa
The physical face-to-face classroom still represents the core educational setting in
which everyday CSCL practice takes place. However, current classrooms are not limited
anymore to books, blackboards and other physical artifacts: laptops, tablets, digital
whiteboards, wikis, shared applications and simulations have also become part of this learning
landscape. These last ones add new layers of complexity to the everyday educational practices
and the dynamics of the classroom. CSCL researchers have traditionally proposed standalone
systems or innovations, focusing their evaluation on the effects and management of a single
system/intervention. However, everyday classroom activities involve multiple subject matters,
different pedagogical approaches as well as a variety of technologies. The assumption that our
innovation is alone no longer holds. The multiplicity and heterogeneity of resources (digital
and legacy) pose a unique set of opportunities and challenges for the CSCL research
community, which are bound to become stronger as time goes by. This collaborative
workshop brought together technology designers, researchers and practitioners, in an attempt
to match CSCL technologies to the pedagogical needs and contextual constraints of
practitioners, identify a set of guidelines to design and connect existing CSCL systems with
each other and with legacy classroom resources, and help teachers and students to make sense
of these heterogeneous learning ecologies.
2016-12-01T09:13:26Z
2016-12-01T09:13:26Z
2016-12-01T09:13:26Z
2015
info:eu-repo/semantics/conferenceObject
Prieto, L.P., Dimitriadis, Y., Harrer, A., Milrad, M., Nussbaum, M., Slotta, J.D. The Orchestrated Collaborative Classroom: Designing and Making Sense of Heterogeneous Ecologies of Teaching and Learning Process. In 11th International Conference on Computer Supported Collaborative Learning (CSCL 2015): Exploring the Material Conditions of Learning. Gothenburg, Sweden, June, 2015. Vol. 2, (N. EPFL-CONF-209189, pp. 880-884)
1573-4552
http://uvadoc.uva.es/handle/10324/21377
eng
https://www.isls.org/cscl2015/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
International Society of the Learning Sciences
oai:uvadoc.uva.es:10324/213812021-06-23T13:29:05Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
JUTE2015
Gallego Lema, Vanesa
Rubia Avi, Bartolomé
Arribas Cubero, Higinio Francisco
Muñoz Cristóbal, Juan Alberto
Aprendizaje
Educación física
TIC
En esta comunicación presentamos un proceso formativo de aprendizaje
ubicuo con apoyo tecnológico, desarrollado en el área de Educación Física en el
Medio Natural. La investigación ha permitido analizar el proceso de
enseñanza/aprendizaje en el Grado de Educación Primaria con mención en
Educación Física, así como la transferencia de conocimientos que ha realizado
el alumnado durante su periodo de prácticas, en los centros de Educación
Primaria. El aprendizaje ubicuo, ha permitido el desarrollo de un diseño educativo
colaborativo, en el que el alumnado y el profesor han podido interactuar en el
proceso formativo desde distintos espacios y momentos. En este trabajo,
describimos la experiencia formativa realizada en la asignatura, junto con la
implementación tecnológica llevada a cabo.
In this paper we present a formative process of ubiquitous learning with
technology support, developed in the area of Physical Education in the Natural
Environment. The research has allowed us to analyze the teaching / learning
process in Primary Education Degree with a major in Physical Education, and the
knowledge transfer made by students during their training period in Primary
Schools. The ubiquitous learning, has enabled the development of a collaborative
educational design, in which students and teacher were able to interact in the
formative process from different places and times. In this paper, we describe the
training experience carried out in the subject, with the technological
implementation performed.
2016-12-01T09:50:43Z
2016-12-01T09:50:43Z
2016-12-01T09:50:43Z
2015
info:eu-repo/semantics/conferenceObject
Gallego Lema, V., Rubia Avi, B., Arribas Cubero, H.F., Muñoz Cristóbal, J.A. Aprendizaje Ubicuo: un proceso formativo en Educación Física en el Medio Natural. JUTE2015: XXIII Jornadas Universitarias de Tecnología Educativa. Badajoz, España, Junio 2015
http://uvadoc.uva.es/handle/10324/21381
spa
http://educalab.es/-/jute-2015
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/213912021-06-23T13:29:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Towards Teacher-Managed Deployment and Integration of Non-SaaS Tools in Virtual Learning Environments.
Cano Parra, Rafael
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
González Martínez, José Antonio
Computación en la nube
Aprendizaje basado en la web
Virtual Learning Environments (VLEs) such as Moodle or
Sakai are now commonplace in many educational settings, but the limited
set of built-in tools (e.g. chats or forums) is often mentioned as
a drawback. While successful solutions to integrate Software as a Service
(SaaS) tools are reported in the literature (e.g. IMS Basic LTI and
GLUE!), there are other non-SaaS tools with potential for education
that cannot be integrated in VLEs. These include single-user standalone
tools that are run on local computers without a web-based interface (e.g.
Matlab), but also virtual machines and laboratories that are common in
Computer Science-related disciplines. This paper addresses the integration
of these non-SaaS tools in VLEs, proposing an architecture to help
teachers to select and configure non-SaaS tools using existing integration
approaches from VLEs, but that also relies on cloud infrastructures for
provisioning and deploying these tools transparently to the end users.
2016-12-01T11:10:56Z
2016-12-01T11:10:56Z
2016-12-01T11:10:56Z
2015
info:eu-repo/semantics/conferenceObject
Cano-Parra, R., Gómez-Sánchez, E., Bote-Lorenzo, M.L., González-Martínez, J.A. Towards Teacher-Managed Deployment and Integration of Non-SaaS Tools in Virtual Learning Environments. In Proceedings of the 10th European Conference on Technology-Enhanced Learning (EC-TEL 2015). Toledo (Spain), September 2015, p. 518-52.
http://uvadoc.uva.es/handle/10324/21391
10.1007/978-3-319-24258-3_60
eng
http://ea-tel.eu/
info:eu-repo/semantics/openAccess
Springer International Publishing
oai:uvadoc.uva.es:10324/213942021-06-23T13:29:18Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Toward the integration of monitoring in the orchestration of across-spaces learning situations
Muñoz Cristóbal, Juan Alberto
Rodríguez Triana, María Jesús
Gallego Lema, Vanesa
Arribas Cubero, Higinio Francisco
Martínez Monés, Alejandra
Asensio Pérez, Juan Ignacio
Realidad virtual
Aprendizaje
Technologies such as augmented Reality (AR), 3D Virtual Worlds (3DVWs) and mobile phones are extending education to other spaces beyond the classroom or the Virtual Learning Environments (VLEs). However, the richness of across-spaces learning situations that could be conducted in all these spaces is hampered by the difficulties (encompassed under the “orchestration” metaphor) that teachers face to carry them out. Monitoring can help in such orchestration, and it has been highly explored in face-to-face and blended learning. Nevertheless, in ubiquitous environments it is usually limited to activities taking place in a specific type of space (e.g., outdoors). In this paper we propose an orchestration system which supports the monitoring of learning situations that may involve web, AR-enabled physical and 3DVW spaces. The proposal was evaluated in three authentic studies, in which a prototype of the system provided monitoring through a web dashboard, an AR app, and a Virtual Globe.
2016-12-01T11:41:22Z
2016-12-01T11:41:22Z
2016-12-01T11:41:22Z
2016
info:eu-repo/semantics/conferenceObject
Muñoz Cristóbal, J. A., Rodríguez Triana, M. J., Gallego Lema, V., Arribas Cubero, H. F., Martínez-Monés, A., Asensio-Pérez, J. I.Toward the integration of monitoring in the orchestration of across-spaces learning situations. In Cross-LAK 2016: International Workshop on Learning Analytics Across Physical and Digital Spaces at at the International Learning Analytics and Knowledge conference (LAK’16). Edinburgh, April, 2016.
http://uvadoc.uva.es/handle/10324/21394
eng
http://lak16.solaresearch.org/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/213962021-06-23T13:29:12Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Design-aware analytics supporting teachers' monitoring of blended learning scenarios in Higher education
Rodríguez Triana, María Jesús
Martínez Monés, Alejandra
Asensio Pérez, Juan Ignacio
Aprendizaje
From the conceptualization to the evaluation of
blended learning scenarios, teachers address multiple tasks,
sometimes being overwhelmed on account of the required time
and associated burden. To support teachers in this endeavor, we
propose to connect the pedagogical decisions made at design time
with the analysis of the participants’ interactions. In this paper,
we evaluate the proposal in two authentic scenarios where we
analysed whether the script-aware monitoring process provided
the participant teachers with relevant information for the orchestration
of blended learning scenarios. The participant teachers
valued the proposal positively in terms of representativeness,
novelty, relevance, required effort, and perceived usefulness.
Additionally, they stated that it was helpful for the orchestration
of the learning scenarios.
2016-12-01T12:08:35Z
2016-12-01T12:08:35Z
2016-12-01T12:08:35Z
2016
info:eu-repo/semantics/conferenceObject
Rodríguez Triana, M.J., Martínez-Monés, A., Asensio-Pérez, Juan I. Design-aware analytics supporting teachers' monitoring of blended learning scenarios in Higher education. LASI: Learning Analytics Summer Institute & Summer School, Bilbao, Spain, junio 2016
http://uvadoc.uva.es/handle/10324/21396
eng
http://lasi16.snola.es/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/213982021-06-23T13:29:23Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
The Phalanx Covenant: Do we need the X-Men to evaluate some ubiquitous learning scenarios?
Jorrín Abellán, Iván Manuel
Muñoz Cristóbal, Juan Alberto
TIC
Tecnologías de la Información y la Comunicación
The rapid evolution of Information and Communication Technologies offers countless possibilities for innovative learning. With the aim of giving answer to current ubiquity in learning, some pervasive learning scenarios involve the integration of very heterogeneous spaces, such as different web and physical environments, and even virtual worlds. Despite there have been several efforts in the field to promote continuous learning experiences in these scenarios, there is still a lack of research done on how to better make sense and evaluate them. In this paper we propose a number of issues that could be taken into account when assessing ubiquitous learning situations. Responsiveness to participants needs and constrains, the incorporation of evaluation since the early stages of learning designs, participants´ intervention in the evaluation design/enactment and the use of ad-hoc technological artifacts for data gathering, constitute some of the emergent aspects we have identified to minimize evaluation uncertainty in these settings.
2016-12-01T13:29:14Z
2016-12-01T13:29:14Z
2016-12-01T13:29:14Z
2015
info:eu-repo/semantics/conferenceObject
Jorrín-Abellán, I.M., Muñoz-Cristóbal, J.A. (2015), “The Phalanx Covenant”: Do we need the X-Men to evaluate some ubiquitous learning scenarios?. 11th International Congress of Qualitative Inquiry, University of Illinois at Urbana-Champaign, May 2015
http://uvadoc.uva.es/handle/10324/21398
eng
http://www.icqi.org
info:eu-repo/semantics/restrictedAccess
All Academic
oai:uvadoc.uva.es:10324/216882021-06-23T13:29:13Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Análisis espectral y no lineal de la señal de oximetría domiciliaria en la ayuda al diagnóstico de la apnea infantil
Álvarez González, Daniel
Gutiérrez Tobal, Gonzalo César
Alonso Álvarez, María Luz
Terán Santos, Joaquín
Campo Matias, Félix del
Hornero Sánchez, Roberto
Apnea infantil
El Síndrome de la Apnea-Hipopnea del Sueño (SAHS) es un desorden respiratorio relacionado con el sueño que supone importantes consecuencias para la salud y el desarrollo de los niños. Para mejorar la detección temprana de esta enfermedad, se propone una metodología basada en el análisis automático de la señal de saturación de oxígeno en sangre (SpO2) procedente de la poligrafía respiratoria (PR) domiciliaria. Para ello se ha analizado una base de datos compuesta por registros de oximetría de 50 niños. Se han desarrollado 2 etapas de procesado de señal: (i) extracción de características, en la que se han calculado medidas espectrales y no lineales combinadas con índices de oximetría convencionales, y (ii) clasificación de características, en la que se ha evaluado el rendimiento
diagnóstico del análisis discriminante lineal (LDA), cuadrático (QDA) y regresión logística (LR). Se ha empleado validación cruzada dejando uno fuera (LOO-CV) para valorar la
capacidad diagnóstica de la metodología. El clasificador basado en LDA alcanzó una sensibilidad del 80.8%, especificidad del 79.2%, precisión del 80.0% y área bajo la curva ROC (AROC) de 0.936, mejorando la precisión alcanzada por los índices convencionales individuales típicamente empleados en la práctica clínica. Nuestros resultados sugieren que el análisis automático de la señal de SpO2 procedente de la PR en el propio domicilio del niño proporciona información relevante y complementaria en el contexto de la ayuda en el
diagnóstico del SAHS infantil.
2016-12-14T08:30:00Z
2016-12-14T08:30:00Z
2016-12-14T08:30:00Z
2014
info:eu-repo/semantics/conferenceObject
XXXII Congreso Anual de la Sociedad Española de Ingeniería Biomédica (CASEIB 2014), Sociedad Española de Ingeniería Biomédica (SEIB), Barcelona, 2014, x p.
http://uvadoc.uva.es/handle/10324/21688
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Ingeniería Biomédica
oai:uvadoc.uva.es:10324/216912021-06-23T13:29:06Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Evaluación de un protocolo de screening de apnea del sueño basado en el análisis automático de la oximetría no supervisada
Álvarez González, Daniel
Gutiérrez Tobal, Gonzalo César
Crespo Senado, Andrea
Arroyo Domingo, Carmen Ainhoa
Campo Matias, Félix del
Hornero Sánchez, Roberto
Apnea del sueño
El síndrome de apnea-hipopnea del sueño (SAHS) es un trastorno respiratorio relacionado con el sueño de elevada prevalencia. Si no se diagnostica correctamente puede tener graves consecuencias en la calidad de vida y en la salud de los pacientes. En el presente estudio se ha diseñado y evaluado un nuevo protocolo de screening de pacientes basado en el procesado automático de la señal de saturación de oxígeno en sangre (SpO2), registrada de forma no supervisada en el domicilio del paciente. La metodología propuesta se divide en 2 etapas complementarias: (i) etapa de clasificación, que emplea un modelo de regresión logística (LR) optimizado para detectar sujetos sin SAHS de tal forma que no se produzcan falsos negativos y (ii) etapa de estimación del índice de apnea hipopnea (IAH), que emplea una red neuronal perceptrón multicapa (MLP) entrenada para estimar el IAH y detectar a los pacientes SAHS positivo más severos sin que se produzcan falsos positivos. Para entrenar y validar la metodología se ha empleado una población de 299 pacientes consecutivos dividida en entrenamiento (50%) y test (50%). La metodología de screening de 2 fases propuesta evitaría la realización del 40.7% de las PSGs completas en el hospital, sin que se produzcan falsos negativos (valor predictivo negativo, NPV = 100%) ni falsos positivos (valor predictivo positivo, PPV = 100%).
2016-12-14T08:47:04Z
2016-12-14T08:47:04Z
2016-12-14T08:47:04Z
2015
info:eu-repo/semantics/conferenceObject
XXXIII Congreso Anual de la Sociedad Española de Ingeniería Biomédica (CASEIB 2015), Sociedad Española de Ingeniería Biomédica (SEIB), Madrid, 2015, x p.
ISBN: 978-84-608-3354-3
http://uvadoc.uva.es/handle/10324/21691
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Ingeniería Biomédica
oai:uvadoc.uva.es:10324/216982021-06-23T13:29:08Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Caracterización de la Dinámica en la Eficiencia de la Red Neuronal en Esquizofrenia en Tarea Cognitiva Auditiva
Gómez Pilar, Javier
Poza Crespo, Jesús
Bachiller Matarranz, Alejandro
Gómez Peña, Carlos
Molina Rodríguez, Vicente
Hornero Sánchez, Roberto
Esquizofrenia
El objetivo de este estudio es caracterizar los cambios dinámicos en la eficiencia de la red neuronal de pacientes con esquizofrenia (SCH) durante la realización de una tarea cognitiva auditiva basada en el paradigma odd-ball. Anteriores estudios sugieren que los daños cognitivos asociados con la SCH podrían estar relacionados con alteraciones funcionales de las redes neuronales, provocando un “síndrome de desconexión”. Por ello, se registró la actividad electroencefalográfica (EEG) de 20 pacientes con SCH y 20 sujetos de control. Se estimó la conectividad mediante la coherencia espectral a partir del EEG.
Posteriormente, se construyó la matriz de adyacencia para obtener dos medidas que cuantifican el intercambio de información en una red, así como su robustez frente a fallos a pequeña escala: la eficiencia global y la eficiencia local. La eficiencia global mostró un aumento de la capacidad de intercambio de información en controles y en pacientes en la
respuesta de una tarea cognitiva con respecto al baseline. Sin embargo, únicamente el aumento de la eficiencia global en controles resultó significativo (p<0.05). Por su parte, el análisis de la eficiencia local mostró diferencias significativas entre grupos en las zonas frontales, centrales y occipitales. Estos resultados sugieren que la organización de la red funcional en pacientes es menos robusta frente a fallos de pequeña escala, lo que indica un déficit en la capacidad de intercambiar información entre distintas regiones cerebrales. Estos hallazgos proporcionan una explicación sobre la menor integración de redes neuronales en pacientes con SCH, principalmente entre zonas cerebrales distantes.
2016-12-14T09:34:04Z
2016-12-14T09:34:04Z
2016-12-14T09:34:04Z
2015
info:eu-repo/semantics/conferenceObject
XXXIII Congreso Anual de la Sociedad Española de Ingeniería Biomédica (CASEIB 2015), Sociedad Española de Ingeniería Biomédica (SEIB), Madrid, 2015, x p.
ISBN: 978-84-608-3354-3
http://uvadoc.uva.es/handle/10324/21698
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Ingeniería Biomédica
oai:uvadoc.uva.es:10324/217012021-09-13T07:43:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Análisis espectral de la señal de flujo aéreo como ayuda al diagnóstico del síndrome de apnea-hipopnea del sueño en niños
Barroso García, Verónica
Gutiérrez Tobal, Gonzalo César
Kheirandish Gozal, Leila
Álvarez González, Daniel
Vaquerizo Villar, Fernando
Crespo Senado, Andrea
Campo Matias, Félix del
Gozal, David
Hornero Sánchez, Roberto
Apnea-hipopnea del sueño en niños
Este estudio evalúa la capacidad diagnóstica de la señal de flujo aéreo monocanal para ayudar a identificar el Síndrome de Apnea-Hipopnea del Sueño (SAHS) pediátrico. Se han analizado 501 registros procedentes de niños (6.21±3.41 años).
Se ha propuesto una metodología en tres etapas: (i) análisis espectral, (ii) selección de características relevantes y no redundantes empleando el algoritmo Fast Correlation-Based Filter (FCBF) y (iii) clasificación binaria mediante regresión logística (RL). Se obtuvieron tres bandas espectrales de interés: BW1 (0.2685-0.3128 Hz), BW2 (0.4059-0.4883 Hz) y BW3 (0.6637-0.8529 Hz), con diferencias estadísticamente significativas (p<0.01) entre sujetos con SAHS y sin SAHS. El modelo RL alcanzó una alta precisión diagnóstica (87.3%)
respecto a otros estudios del estado del arte. Estos resultados señalan que el análisis espectral de la señal de flujo aéreo es de utilidad para ayudar a identificar la presencia de SAHS en sujetos pediátricos.
2016-12-14T09:51:58Z
2016-12-14T09:51:58Z
2016-12-14T09:51:58Z
2016
info:eu-repo/semantics/conferenceObject
XXXIV Congreso Anual de la Sociedad Española de Ingeniería Biomédica (CASEIB 2016), Sociedad Española de Ingeniería Biomédica (SEIB), Valencia, 2016, x p.
978-84-9048-531-6
http://uvadoc.uva.es/handle/10324/21701
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Ingeniería Biomédica
oai:uvadoc.uva.es:10324/217022021-06-23T13:29:20Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Análisis de la señal de oximetría mediante la densidad espectral de potencia y bispectrum en la ayuda al diagnóstico de la apnea infantil
Vaquerizo Villar, Fernando
Álvarez González, Daniel
Gutiérrez Tobal, Gonzalo César
Barroso García, Verónica
Kheirandish Gozal, Leila
Crespo Senado, Andrea
Campo Matias, Félix del
Gozal, David
Hornero Sánchez, Roberto
Apnea infantil
El Síndrome de la Apnea Hipopnea del Sueño (SAHS) es un trastorno respiratorio que puede originar consecuencias muy negativas para la salud de los niños. El test diagnóstico estándar es la polisomnografía (PSG), que es compleja, de elevado coste y disponibilidad limitada. El objetivo de este estudio es analizar la capacidad diagnóstica de la señal de saturación de oxígeno en sangre (Sp02) procedente de la PSG nocturna en la ayuda al diagnóstico del SAHS pediátrico. Para conseguir este objetivo se han combinado características procedentes de distintas técnicas de análisis espectral, la densidad espectral de potencia (PSD) y el Bispectrum. Esta metodología se ha desarrollado en dos etapas: (i) extracción de características, en la que se han calculado parámetros espectrales procedentes de la PSD y el Bispectrum, y (ii) clasificación de características, en la que se ha construido un modelo de regresión logística (LR) a partir de los parámetros espectrales extraídos. Se han analizado 298 registros de Sp02 divididos en grupo de entrenamiento (40%) y test (60%) para entrenar y validar, respectivamente, el método propuesto. El clasificador LR ha alcanzado una sensibilidad del 90.4%, una especificidad del 66.7% y una precisión del 88.8%, mejorando la precisión alcanzada por los índices de oximetría comúnmente empleados en la clínica. Estos resultados sugieren que el uso conjunto de información de la PSD y el Bispectrum incrementa la capacidad diagnóstica de los registros de Sp02 y mejora el rendimiento de los índices de oximetría clásicos en la ayuda al diagnóstico del SAHS infantil.
2016-12-14T10:06:26Z
2016-12-14T10:06:26Z
2016-12-14T10:06:26Z
2016
info:eu-repo/semantics/conferenceObject
XXXIV Congreso Anual de la Sociedad Española de Ingeniería Biomédica (CASEIB 2016), Sociedad Española de Ingeniería Biomédica (SEIB), Valencia, 2016, p. 202-205
978-84-9048-531-6
http://uvadoc.uva.es/handle/10324/21702
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Ingeniería Biomédica
oai:uvadoc.uva.es:10324/217032021-06-23T13:29:21Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Análisis de los cambios espectrales del EEG producidos por el entrenamiento neurocognitivo mediante una interfaz cerebro-ordenador
Gómez Pilar, Javier
Corralejo Palacios, Rebeca
Martínez Cagigal, Víctor
Álvarez González, Daniel
Hornero Sánchez, Roberto
Neurofeedback
Los sistemas cerebro-ordenador (Brain-Computer
Interfaces, BCIs) se han convertido no sólo en una
herramienta asistencial para personas con
discapacidad, sino también en una manera de
rehabilitar ciertas funciones motoras o cognitivas.
La plasticidad cerebral puede ser restaurada en una
función cerebral normal mediante la inducción de
acontecimientos que varíen la actividad cerebral. La
sincronización/desincronización voluntaria de la
actividad del electroencefalograma (EEG) en las
bandas espectrales alfa y beta están asociadas con
diferentes áreas cognitivas. En este sentido, el
entrenamiento neurocognitivo (Neurofeedback
Trainin, NFT) ha demostrado ser una herramienta
eficaz para controlar la propia actividad cerebral.
Por tanto, se abre la posibilidad de diseñar
protocolos de entrenamiento combinando las
virtudes del NFT y de los sistemas BCI. En
anteriores estudios, hemos demostrado que el NFT
produce cambios cognitivos en distintas funciones
cerebrales. Sin embargo, para reforzar estos
hallazgos, es importante encontrar evidencias de
cambios en el EEG después de realizar el NFT. En el
presente estudio, fueron analizados los cambios
neurocognitivos utilizando un grupo de control (20
sujetos) y un grupo de entrenamiento (11 sujetos)
antes y después de realizar el NFT. Además, se
analizaron los cambios espectrales en las bandas
entrenadas del EEG mediante la potencia relativa
(PR). Después de únicamente 5 sesiones de
entrenamiento, se encontraron mejoras significativas
(p < 0.05) en varias funciones cognitivas. Asimismo,
se observó un aumento significativo de la PR en el
grupo experimental en las bandas entrenadas. Este
estudio pone de manifiesto, que los cambios en el
EEG debidos al NFT se encuentran ligados a un
aumento de la potencia en las bandas espectrales
entrenadas. Estos cambios espectrales podrían
ayudar a explicar las causas subyacentes de las
mejoras cognitivas debidas al NFT.
2016-12-14T10:21:28Z
2016-12-14T10:21:28Z
2016-12-14T10:21:28Z
2015
info:eu-repo/semantics/conferenceObject
7º Simposio CEA de Bioingeniería. Interfaces Cerebro-computador (BCI) y Tecnologías Asistenciales. Cognitive Area Networks, 2015, vol. 2, nº 1, p. 15-21
2341-4243
http://uvadoc.uva.es/handle/10324/21703
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Asociación Nicolo
oai:uvadoc.uva.es:10324/217892023-04-20T12:46:02Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Aplicación de una red neuronal basada en la oximetría nocturna como método de ayuda diagnóstica del síndrome de apnea-hipopnea del sueño en pacientes con enfermedad pulmonar obstructiva crónica
Andrés Blanco, Ana María
Álvarez González, Daniel
Hornero Sánchez, Roberto
Frutos Arribas, Julio Fernando de
Gutiérrez Tobal, Gonzalo César
Arroyo Domingo, Carmen Ainhoa
Campo Matias, Félix del
Apnea-hipopnea del sueño
El Síndrome de Apnea-Hipopnea del Sueño (SAHS) y la Enfermedad Pulmonar Obstructiva Crónica (EPOC) son enfermedades respiratorias muy prevalentes que asocian gran morbilidad. En la actualidad se admite que pacientes con sospecha clínica alta realicen registros domiciliarios en ausencia de comorbilidades. El análisis automático de la saturación de oxihemoglobina (SpO2) proporciona información útil en la detección del SAHS, aunque la coexistencia de otras patologías puede incrementar el error diagnóstico. Pocos estudios validan la utilidad de estas técnicas en pacientes con enfermedades asociadas, como es el caso de EPOC. El objetivo del estudio consiste en evaluar la concordancia entre el índice de apnea-hipopnea (IAH) derivado de la polisomnografía (PSG) y un método automático basado en una red neuronal aplicada a la señal de SpO2, tanto a nivel hospitalario como domiciliario en pacientes con y sin EPOC
2016-12-16T08:26:39Z
2016-12-16T08:26:39Z
2016-12-16T08:26:39Z
2016
info:eu-repo/semantics/conferenceObject
49º Congreso Nacional SEPAR, Granada: Sociedad Española de Neumología y Cirugía Torácica, 2016
http://uvadoc.uva.es/handle/10324/21789
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Neumología y Cirugía Torácica
oai:uvadoc.uva.es:10324/217912021-06-23T13:29:15Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Evaluación de un clasificador máquina vector soporte en la ayuda al diagnóstico del síndrome de apneahipopnea obstructiva del sueño en niños
Crespo Senado, Andrea
Álvarez González, Daniel
Kheirandish Gozal, Leila
Gutiérrez Tobal, Gonzalo César
Philby, Mona F.
Mohammadi, M.
Hornero Sánchez, Roberto
Gozal, David
Campo Matias, Félix del
Apnea-hipopnea del sueño en niños
El síndrome de apnea hipopnea obstructiva del sueño (SAHS) en niños se ha convertido en un problema médico frecuente en las últimas 2-3 décadas. Es una patología que si no se trata se asocia a comorbilidades graves relacionadas con el sistema nervioso central y los sistemas cardiovascular y metabólico. La PSG hospitalaria es la prueba gold standard para su diagnóstico, pero es una técnica compleja, costosa y a veces inaccesible. La SpO2 de la pulsioximetría nocturna podría proporcionar información simplificando el proceso diagnóstico. El objetivo de nuestro estudio ha sido diseñar y evaluar un clasificador automatizado destinado a diagnosticar el SAHS.
2016-12-16T08:35:52Z
2016-12-16T08:35:52Z
2016-12-16T08:35:52Z
2016
info:eu-repo/semantics/conferenceObject
49º Congreso Nacional SEPAR, Granada: Sociedad Española de Neumología y Cirugía Torácica, 2016
http://uvadoc.uva.es/handle/10324/21791
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Neumología y Cirugía Torácica
oai:uvadoc.uva.es:10324/217922021-06-24T10:04:17Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Diseño y evaluación de un test de screening de apnea del sueño mediante procesado automático de la oximetría domiciliaria
Crespo Senado, Andrea
Álvarez González, Daniel
Gutiérrez Tobal, Gonzalo César
Arroyo Domingo, Carmen Ainhoa
Hornero Sánchez, Roberto
Frutos Arribas, Julio Fernando de
Campo Matias, Félix del
Apnea del sueño
El objetivo del estudio es evaluar un test de screening en pacientes con sospecha de Síndrome de Apnea-Hipopnea del Sueño (SAHS) basado en el análisis automático de la saturación de oxígeno en sangre (SpO2) procedente de la oximetría nocturna no supervisada. Los índices clásicos como el índice de desaturación del 3% (ODI3) presentan una elevada especificidad diagnóstica, mientras que los métodos automáticos como las redes neuronales (RN) alcanzan mayor sensibilidad. Ambos enfoques son complementarios y podrían emplearse para confirmar y descartar SAHS de forma conjunta. Se propone combinar ambas técnicas mediante un test de screening secuencial para reducir el número de polisomnografías (PSGs).
2016-12-16T08:42:06Z
2016-12-16T08:42:06Z
2016-12-16T08:42:06Z
2016
info:eu-repo/semantics/conferenceObject
49º Congreso Nacional SEPAR, Granada: Sociedad Española de Neumología y Cirugía Torácica, 2016
http://uvadoc.uva.es/handle/10324/21792
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Sociedad Española de Neumología y Cirugía Torácica
oai:uvadoc.uva.es:10324/239442021-06-23T13:29:24Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
APRENDIZAJE COLABORATIVO EN LA ASIGNATURA “SISTEMAS DE COMUNICACIÓN”: EVALUACIÓN DE LOS CONOCIMIENTOS ADQUIRIDOS
Gómez Peña, Carlos
García Gadañón, María
Poza Crespo, Jesús
Hornero Sánchez, Roberto
Introducción. El Proceso de Bolonia ha impulsado un nuevo modelo educativo que pretende centrar las metodologías docentes en el aprendizaje de los estudiantes, priorizando el manejo de herramientas por encima de la mera acumulación de conocimientos. Objetivo. El objetivo de este trabajo es evaluar la eficacia del aprendizaje colaborativo en la asignatura “Sistemas de Comunicación”, que se imparte en la E.T.S. Ingenieros de Telecomunicación de la Universidad de Valladolid. Método. Se emplearon diferentes herramientas basadas en el aprendizaje colaborativo dentro de la “Práctica sobre telefonía móvil de cuarta generación”. Dicha práctica está compuesta por diferentes actividades: (i) Trabajo escrito individual; (ii) Actividad de revisión por pares; (iii) Debate; (iv) Actividad puzle; (v) Trabajo escrito grupal; y (vi) Exposición y defensa del trabajo grupal. Resultados. Las encuestas realizadas a los alumnos mostraron que están muy satisfechos con esta práctica, puesto que les ha permitido desarrollar diferentes competencias transversales. Además, los alumnos obtuvieron una mayor calificación en el examen final de la asignatura en la pregunta sobre telefonía móvil de cuarta generación (Calificación sobre 1 punto = 0.59 0.33 puntos, media desviación estándar) que en la pregunta análoga sobre telefonía móvil de tercera generación, tema impartido utilizando una metodología docente tradicional (Calificación sobre 1 punto = 0.51 0.34 puntos). Conclusiones. El aprendizaje colaborativo no sólo permite a los alumnos adquirir competencias transversales, sino que además les permite interiorizar más conocimientos teóricos que la docencia tradicional.
2017-06-26T11:13:51Z
2017-06-26T11:13:51Z
2017-06-26T11:13:51Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/23944
spa
info:eu-repo/semantics/openAccess
Asociación Española de Psicología Conductual (AEPC)
oai:uvadoc.uva.es:10324/248362021-06-23T13:29:39Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Automatic group formation in a MOOC based on students' activity criteria
Sanz Martínez, María Luisa
Muñoz Cristóbal, Juan Alberto
Bote Lorenzo, Miguel Luis
Martínez Monés, Alejandra
Dimitriadis Damoulis, Ioannis
Although there is significant evidence regarding benefits of small group collaboration in small-scale contexts, several challenges have been about use of collaborative learning in MOOCs. Group formation, which crucial activity in order to achieve effective collaboration, is scarcely covered in MOOC platforms, which do not allow the formation teams using criteria defined by the instructors. This paper presents exploratory study conducted in a seven-week MOOC, comparing group formation proposal, based on students’ activity criteria, to a baseline grouping function provided by the platform. We analyse the impact of each grouping approach over group performance, group activity, and student satisfaction. The results show initial evidence about the advantages of using the criteria-based formation approach regarding student satisfaction and group interactions
2017-07-31T08:28:07Z
2017-07-31T08:28:07Z
2017-07-31T08:28:07Z
2017
info:eu-repo/semantics/conferenceObject
Sanz-Martínez, L., Martínez-Monés, A., Bote-Lorenzo, M. L., Muñoz-Cristóbal, J. A. & Dimitriadis, Y. Automatic group formation in a MOOC based on students' activity criteria. In Proceedings of the 12th European Conference on Technology Enhanced Learning, (accepted), Tallinn, Estonia, 2017
http://uvadoc.uva.es/handle/10324/24836
eng
http://www.springer.com/gp/products/proceedings
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248372021-06-23T13:29:40Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
How Gamification is Being Implemented in MOOCs? A Systematic Literature Review
Ortega Arranz, Alejandro
Muñoz Cristóbal, Juan Alberto
Martínez Monés, Alejandra
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
Although MOOCs are being established as a very popular technology to support learning, they are often criticized for their lack of support to active pedagogies and the high drop-out rates. One approach to face this problem is gamification, due to the promising benefits al-ready shown at small-scale environments. Attending to the current and growing use of game elements in MOOCs, this paper presents a systematic literature review of the usage of gamification in MOOCs, aimed at analyzing how gamification is being implemented in MOOCs, and to identify unexplored research opportunities in this field. The results show that gamification is still at an early stage in MOOCs, and it is being implemented in similar ways to those at small scale contexts
2017-07-31T08:45:33Z
2017-07-31T08:45:33Z
2017-07-31T08:45:33Z
2017
info:eu-repo/semantics/conferenceObject
Ortega-Arranz, A., Muñoz-Cristóbal, J. A., Martínez-Monés, A., Bote-Lorenzo, M. L. & Asensio-Pérez, J. I. How Gamification is Being Implemented in MOOCs? A Systematic Literature Review. In Proceedings of the 12th European Conference on Technology Enhanced Learning, (accepted), Tallinn, Estonia, 2017
http://uvadoc.uva.es/handle/10324/24837
eng
http://www.springer.com/gp/products/proceedings
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248452021-06-23T13:29:42Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Predicting Peer-Review Participation at Large Scale Using an Ensemble Learning Method
Er, Erkan
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
Dimitriadis Damoulis, Ioannis
Asensio Pérez, Juan Ignacio
Peer review has been an effective approach for the assessment of mas-sive numbers of student artefacts in MOOCs. However, low student participation is a barrier that can result in inefficiencies in the implementation of peer reviews, disrupting student learning. In this regard, knowing earlier the estimate number of peer works that students will review may bring numerous pedagogical utilities in MOOCs. Previously, we have attempted to predict student participation in peer review in a MOOC context. Building on our previous work, in this study we pro-pose an ensemble learning approach with a refined set of features. Results show that the prediction performance improves when a preceding classification model is trained to identify students with no peer-review participation and that the re-fined features were effective with more transferability to other contexts.
2017-07-31T10:24:38Z
2017-07-31T10:24:38Z
2017-07-31T10:24:38Z
2017
info:eu-repo/semantics/conferenceObject
Er, E., Gómez-Sánchez, E., Bote-Lorenzo, M.L., Dimitriadis, Y., Asensio-Pérez, J.I. Predicting Peer-Review Participation at Large Scale Using an Ensemble Learning Method. Proceedings of the Learning Analytics Summer Institute Spain 2017, Madrid, Spain, July 2017.
http://uvadoc.uva.es/handle/10324/24845
eng
http://ceur-ws.org/
https://lasi17.snola.es/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
CEUR Workshop Proceedings
oai:uvadoc.uva.es:10324/248492021-06-23T13:29:43Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Orchestration challenges raised by transporting a traditional writing activity into a web-based Computer Supported Collaborative Language Learning activity
Delatolla, Eirini
Daradoumis, Thanasis
Dimitriadis Damoulis, Ioannis
Language teaching is dominated by traditional methodologies and teachers argue
that elaborated pedagogies combined with innovative technologies lead to a classroom with a
“complex ecosystem”. Attempting to understand the causes of the appearing management
issues, this paper uses the term orchestration to describe real-time management of learning
processes and examines the orchestration challenges raised when transporting an individual
writing activity into a Computer-Supported Collaborative Language Learning (CSCLL) one.
2017-07-31T10:56:01Z
2017-07-31T10:56:01Z
2017-07-31T10:56:01Z
2017
info:eu-repo/semantics/conferenceObject
Delatolla, E., Daradoumis, T., Dimitriadis, Y. Orchestration challenges raised by transporting a traditional writing activity into a web-based Computer Supported Collaborative Language Learning activity. Proceedings of the 12th International Conference on Computer Supported Collaborative Learning, CSCL 2017, Philadelphia, June 2017.
1573-4552
http://uvadoc.uva.es/handle/10324/24849
eng
https://www.isls.org/conferences/cscl
https://cscl17.wordpress.com/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
International Society of the Learning Sciences (ISLS)
oai:uvadoc.uva.es:10324/248522021-10-18T11:45:08Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
From Low-Scale to Collaborative, Gamified and Massive-Scale Courses: Redesigning a MOOC
Ortega Arranz, Alejandro
Sanz Martínez, María Luisa
Álvarez Álvarez, Susana
Muñoz Cristóbal, Juan Alberto
Bote Lorenzo, Miguel Luis
Martínez Monés, Alejandra
Dimitriadis Damoulis, Ioannis
Despite the success of MOOCs to promote open leaning, they are usually criticized for their high drop-out rates and behaviorist pedagogical approach. Some active learning strategies, such as collaboration and gamification, have shown their potential to overcome some of these problems at low scale. However, the design and implementation of such strategies in MOOCs is still a challenge, which is being studied by several researchers, who tend to focus specially on the enactment of MOOCs. Therefore, there is a need for research studies exploring the design processes of MOOCs including active strategies. In this paper, we describe a co-redesign process in which an economic translation course conceived as a MOOC but finally implemented in Moodle for blended learning, was redesigned to include collaboration and gamification to implement it in Canvas Network (a MOOC platform). During the redesign process we found severe difficulties related to the scale, which were mainly caused by the initial implementation in a typical LMS.
2017-07-31T11:19:07Z
2017-07-31T11:19:07Z
2017-07-31T11:19:07Z
2017
info:eu-repo/semantics/conferenceObject
Ortega-Arranz, A., Sanz-Martínez, L., Álvarez-Álvarez, S., Muñoz-Cristóbal, J.A., Bote-Lorenzo, M.L., Martínez-Monés, A., Dimitriadis, Y. From Low-Scale to Collaborative, Gamified and Massive-Scale Courses: Redesigning a MOOC. Proceedings of the Fifth European MOOCs Stakeholders Summit, EMOOCs 2017, Madrid, Spain, May 2017.
http://uvadoc.uva.es/handle/10324/24852
10.1007/978-3-319-59044-8_9
eng
https://link.springer.com/chapter/10.1007/978-3-319-59044-8_9
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248572021-10-18T11:45:23Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Gamifying Collaborative Activities in MOOCs
Ortega Arranz, Alejandro
Muñoz Cristóbal, Juan Alberto
Martínez Monés, Alejandra
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
MOOCs can bring together thousands of students with different background in the same course. This fact presents a good opportunity for instructors to design and enact collaborative activities that may involve groups.
However, MOOCs present some drawbacks that can hinder the completion of this kind of activities such as the high drop-out rates, the self-paced character or the resistance of the students to abandon their comfort zone. The use of gamification in MOOC contexts has shown potential benefits to enhance students' engagement, encourage students to interact with others and promote activity submission, which can be useful for increasing the completion of such collaborative activities. This paper shows the gamification design, and the first outcomes, of a MOOC that involves gamified and collaborative activities. To carry this out, the course was configured with 15 badges that students can achieve when performing social and optional actions for completing the course
2017-07-31T11:40:31Z
2017-07-31T11:40:31Z
2017-07-31T11:40:31Z
2017
info:eu-repo/semantics/conferenceObject
Ortega-Arranz, A., Muñoz-Cristóbal, J.A., Martínez-Monés, A., Bote-Lorenzo, M.L., Asensio-Pérez, J.I. Gamifying Collaborative Activities in MOOCs. Proceedings of the Fifth European MOOCs Stakeholders Summit, eMOOCS 2017, Madrid, Spain, May 2017.
http://uvadoc.uva.es/handle/10324/24857
eng
https://link.springer.com/book/10.1007/978-3-319-59044-8
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248872021-06-23T13:29:33Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Marco para el Análisis de la Colaboración y la Gamificación en MOOC
García Sastre, Sara
Idrissi-Ghlimi Cao, Miriam
Ortega Arranz, Alejandro
Muñoz Cristóbal, Juan Alberto
Gómez Sánchez, Eduardo
A pesar del éxito actual de los MOOC, estos son criticados por limitarse a pedagogías conectivistas, centradas en el contenido. Otras pedagogías activas como el aprendizaje colaborativo o el basado en juegos, tienen escasa presencia en los MOOC, debido a la dificultad de su implementación, a pesar de los beneficios que han demostrado en otros contextos educativos. Debido a ello, existe interés en la comunidad por entender las capacidades de los MOOC actuales para incluir pedagogías activas. En este artículo se propone un marco conceptual para analizar distintos MOOC y poder comprender cómo plantean la colaboración y la gamificación. Para ello, se ha creado un modelo de análisis compuesto por distintas categorías, cuya aplicabilidad se ilustra mediante el análisis de tres MOOC existentes.
2017-08-17T10:27:30Z
2017-08-17T10:27:30Z
2017-08-17T10:27:30Z
2017
info:eu-repo/semantics/conferenceObject
García Sastre, S., Idrissi Cao, M., Ortega Arranz, A., Muñoz Cristóbal, J.A., Gómez Sánchez, E. Marco para el Análisis de la Colaboración y la Gamificación en MOOC Actas de la Fifth European MOOCs Stakeholders Summit, eMOOCS 2017, Madrid, España, Mayo 2017.
http://uvadoc.uva.es/handle/10324/24887
spa
https://link.springer.com/book/10.1007/978-3-319-59044-8
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248882021-10-18T11:46:34Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Toward Criteria-Based Automatic Group Formation in MOOCs
Sanz Martínez, María Luisa
Muñoz Cristóbal, Juan Alberto
Bote Lorenzo, Miguel Luis
Martínez Monés, Alejandra
Dimitriadis Damoulis, Ioannis
Effective use of Collaborative Learning in MOOC contexts faces many challenges. One of them regards the possibility to create groups according to a set of criteria, which is not currentlly supported by MOOC platforms. This paper presents our work in progress on this problem. We introduce the design and initial results of an experiment where groups based on homogeneous levels of activity, as creation criteria, are compared with randomly created control groups. The preliminary results provide initial evidence about the feasibility and eventual advantages of using criteria-based group formation in MOOCs.
2017-08-17T10:38:09Z
2017-08-17T10:38:09Z
2017-08-17T10:38:09Z
2017
info:eu-repo/semantics/conferenceObject
Sanz-Martínez, L., Muñoz-Cristóbal, J.A., Bote-Lorenzo, M.L., Martínez-Monés, A., Dimitriadis, Y. Toward Criteria-Based Automatic Group Formation in MOOCs. Proceedings of the Fifth European MOOCs Stakeholders Summit, EMOOCs 2017, Madrid, Spain, May 2017.
http://uvadoc.uva.es/handle/10324/24888
eng
https://link.springer.com/book/10.1007/978-3-319-59044-8
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248892021-06-23T13:29:48Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Predicting Student Participation in Peer Reviews in MOOCs
Er, Erkan
Bote Lorenzo, Miguel Luis
Gómez Sánchez, Eduardo
Dimitriadis Damoulis, Ioannis
Asensio Pérez, Juan Ignacio
Assessing and providing feedback to thousands of student artefacts in MOOCs is an unfeasible task for instructors. Peer review, a well-known pedagogical approach that offers various learning gains, has been a common approach to address this practical challenge. However, low student participation is a potential barrier to the success of peer reviews. The present study proposes an approach to predict student participation in peer reviews in a MOOC context, which can be utilized to achieve an effective peer-review activity. We attempt to predict the number of different peer works that students will review for each of four assignments based on their past activities in the course. Results show that students’ preceding activities were predictive of their participation in peer reviews starting from the first assignment, and that the prediction accuracy improved considerably with the inclusion of past peer-review activities.
2017-08-17T10:47:26Z
2017-08-17T10:47:26Z
2017-08-17T10:47:26Z
2017
info:eu-repo/semantics/conferenceObject
Er, E., Bote-Lorenzo, M.L., Gómez-Sánchez, E., Dimitriadis, Y., Asensio-Pérez, J.I. Predicting Student Participation in Peer Reviews in MOOCs Proceedings of the Fifth European MOOCs Stakeholders Summit, Madrid, Spain, May 2017
http://uvadoc.uva.es/handle/10324/24889
eng
https://link.springer.com/book/10.1007/978-3-319-59044-8
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer International Publishing
oai:uvadoc.uva.es:10324/248902021-06-23T13:29:26Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Predicting the decrease of engagement indicators in a MOOC
Bote Lorenzo, Miguel Luis
Gómez Sánchez, Eduardo
Predicting the decrease of students’ engagement in typical MOOC tasks such as watching lecture videos or submitting assignments is key to trigger timely interventions in order to try to avoid the disengagement before it takes place. This paper proposes an approach to build the necessary predictive models using students’ data that becomes available during a course. The approach was employed in an experimental study to predict the decrease of three different engagement indicators in a MOOC. The results suggest its feasibility with values of area under the curve for different predictors ranging from 0.718 to 0.914.
2017-08-17T11:09:40Z
2017-08-17T11:09:40Z
2017-08-17T11:09:40Z
2017
info:eu-repo/semantics/conferenceObject
Bote-Lorenzo, M.L., Gómez-Sánchez, E. Predicting the decrease of engagement indicators in a MOOC. Proceedings of the 7th International Conference on Learning Analytics and Knowledge, LAK 2017, 143-147, Vancouver, Canada, March 2017
http://uvadoc.uva.es/handle/10324/24890
10.1145/3027385.3027387
eng
http://lak17.solaresearch.org
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Association for Computing Machinery (ACM)
oai:uvadoc.uva.es:10324/248952021-10-18T11:46:50Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Toward Multimodal Analytics in Ubiquitous Learning Environments
Muñoz Cristóbal, Juan Alberto
Rodríguez Triana, María Jesús
Bote Lorenzo, Miguel Luis
Villagrá Sobrino, Sara Lorena
Asensio Pérez, Juan Ignacio
Martínez Monés, Alejandra
While Ubiquitous Learning Environments (ULEs) have shown several benefits for learning, they pose challenges for orchestration. Teachers need to be aware of the learning process, which is difficult to achieve when it occurs across a heterogeneous set of spaces, resources and devices. In addition, ULEs can benefit from multimodal analyses due to the heterogeneity of the data sources available (e.g., logs, geolocation, sensor information, learning artifacts). In previous works, we proposed an orchestration system with some analytics features that can gather multimodal datasets during the learning process. Based on this experience, in this paper we describe the technological support provided by the system to collect data from multiple spaces and sources as well as the structure of the generated dataset. We also reflect about the challenges of multimodal learning analytics (MMLA) in ULEs, and we pose some ideas about how the system could better support MMLA in the future to mitigate those challenges.
2017-08-17T11:37:46Z
2017-08-17T11:37:46Z
2017-08-17T11:37:46Z
2017
info:eu-repo/semantics/conferenceObject
Muñoz-Cristóbal, J.A., Rodríguez-Triana, M.J., Bote-Lorenzo, M.L., Villagrá-Sobrino, S.L., Asensio-Pérez, J.I., Martínez-Monés, A. Toward Multimodal Analytics in Ubiquitous Learning Environments. Proceedings of the Sixth Multimodal Learning Analytics Workshop at the International Learning Analytics and Knowledge Conference, LAK 2017, Vancouver, Canada, March 2017
http://uvadoc.uva.es/handle/10324/24895
eng
http://lak17.solaresearch.org
info:eu-repo/grantAgreement/EC/H2020/731685
info:eu-repo/grantAgreement/EC/H2020/669074
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Association for Computing Machinery (ACM)
oai:uvadoc.uva.es:10324/249112021-06-23T13:29:27Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
MOOC! ¡MOOC! ¿Quién es? El aprendizaje colaborativo llama a las puertas de los MOOC
Ortega Arranz, Alejandro
García Sastre, Sara
Las tendencias que se perfilan en educación superior con los avances tecnológicos ayudan a la transmisión del conocimiento planteando nuevos modos de enseñanza-aprendizaje. Se ha investigado mucho sobre el fenómeno MOOC, sus repercusiones en la educación actual y sus potenciales beneficios. Pero, algunas de las peculiaridades de los MOOC (ej. su escala masiva) fuerzan a que la mayoría de estas las plataformas (ej. Coursera, Udacity, edX) permitan crear y ofrecer estos cursos siguiendo una pedagogía conductista tradicional, cuyo material lectivo son vídeos previamente grabados por los profesores, y los estudiantes son auto-evaluados mediante tests
2017-08-18T10:39:45Z
2017-08-18T10:39:45Z
2017-08-18T10:39:45Z
2016
info:eu-repo/semantics/conferenceObject
Ortega-Arranz, A., García-Sastre, S. ¡MOOC! ¡MOOC! ¿Quién es? El aprendizaje colaborativo llama a las puertas de los MOOC. Proceedings of the XIX Congreso Internacional EDUTEC 2016, November 2016.
978-84-9921-847-2
http://uvadoc.uva.es/handle/10324/24911
spa
http://edutec.ddgde.ua.es/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Ediciones Octaedro
oai:uvadoc.uva.es:10324/249152021-06-23T13:29:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Influential Factors for Managing Virtual Groups in Massive and Variable Scale Courses
Sanz Martínez, María Luisa
Dimitriadis Damoulis, Ioannis
Martínez Monés, Alejandra
Alario Hoyos, Carlos
Bote Lorenzo, Miguel Luis
Rubia Avi, Bartolomé
Ortega Arranz, Alejandro
Integration of collaborative learning in MOOCs (Massive Open Online Courses) is an open research challenge. However, team formation and subsequent management are complex tasks that depend on multiple factors, both pedagogical and technological. To fulfill these tasks, it would be helpful to provide teachers with supporting tools. This paper analyzes the factors influencing the formation of teams in MOOCs that can be taken into consideration in the design of this type of supporting tools. The paper presents a proposed classification and illustrates their need and utility by a scenario.
2017-08-18T11:08:06Z
2017-08-18T11:08:06Z
2017-08-18T11:08:06Z
2016
info:eu-repo/semantics/conferenceObject
Sanz-Martínez, L., Dimitriadis, Y., Martínez-Monés, A., Alario-Hoyos, C., Bote-Lorenzo, M.L., Rubia-Avi, B., Ortega-Arranz, A. Influential Factors for Managing Virtual Groups in Massive and Variable Scale Courses. Proceedings of the 2016 International Symposium on Computers in Education, SIIE 2016, 1-4, Salamanca, Spain, September 2016.
http://uvadoc.uva.es/handle/10324/24915
10.1109/SIIE.2016.7751851
eng
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7736610
info:eu-repo/semantics/openAccess
© IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/249182021-06-23T13:29:29Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Factores Influyentes en la Gestión de Grupos Virtuales en Cursos de Escala Masiva y Variable
Sanz Martínez, María Luisa
Dimitriadis Damoulis, Ioannis
Martínez Monés, Alejandra
Alario Hoyos, Carlos
Bote Lorenzo, Miguel Luis
Rubia Avi, Bartolomé
Ortega Arranz, Alejandro
La integración del aprendizaje colaborativo en Cursos Abiertos Masivos en Línea o MOOC (Massive Open Online Courses) es un reto que varios investigadores están tratando de afrontar. Sin embargo, la formación de equipos y su posterior manejo es una tarea compleja que depende de múltiples factores, tanto pedagógicos como tecnológicos. Para el desempeño de dicha tarea sería útil que los profesores pudieran contar con algún tipo de herramienta de apoyo. Este artículo analiza los factores que influyen la formación de equipos en MOOC y que
pueden ser tenidos en consideración en el diseño de este tipo de herramientas de apoyo, presenta una propuesta de clasificación e ilustra su necesidad y utilidad mediante un escenario.
2017-08-21T07:37:12Z
2017-08-21T07:37:12Z
2017-08-21T07:37:12Z
2016
info:eu-repo/semantics/conferenceObject
Sanz-Martínez, L., Dimitriadis, Y., Martínez-Monés, A., Alario-Hoyos, C., Bote-Lorenzo, M.L., Rubia-Avi, B., Ortega-Arranz, A. Factores Influyentes en la Gestión de Grupos Virtuales en Cursos de Escala Masiva y Variable. Proceedings of the 2016 International Symposium on Computers in Education, SIIE 2016, 1-4, Salamanca, Spain, September 2016.
978-84-9012-630-1
http://uvadoc.uva.es/handle/10324/24918
spa
https://gredos.usal.es/jspui/handle/10366/131450
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Universidad de Salamanca
oai:uvadoc.uva.es:10324/249192021-06-23T13:29:36Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Predicción de pérdida de implicación de los participantes de un curso en línea masivo y abierto
Bote Lorenzo, Miguel Luis
Gómez Sánchez, Eduardo
En este artículo se propone llevar a cabo la predicción de pérdida de implicación de los participantes de un curso en línea masivo y abierto a partir de dos indicadores, uno basado en el consumo de vídeos y otro en la realización de pruebas de evaluación. De esta forma resulta posible intervenir antes de que de que la implicación decaiga, de manera que los
participantes continúen aprovechando el curso desde un punto de vista educativo. Los resultados muestran que es posible construir predictores con un área bajo la curva comprendida entre 0,847 y 0,909 para detectar la pérdida de implicación a partir del consumo de vídeos, y de entre 0,725 y 0,915 a partir de la realización de pruebas de evaluación.
2017-08-21T07:46:41Z
2017-08-21T07:46:41Z
2017-08-21T07:46:41Z
2016
info:eu-repo/semantics/conferenceObject
Bote-Lorenzo, M.L., Gómez-Sánchez, E. Predicción de pérdida de implicación de los participantes de un curso en línea masivo y abierto. Proceedings of the XVIII Simposio Internacional de Informática Educativa, SIIE 2016, Salamanca, Spain, September 2016.
978-84-9012-630-1
http://uvadoc.uva.es/handle/10324/24919
spa
https://gredos.usal.es/jspui/handle/10366/131450
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
https://gredos.usal.es/jspui/handle/10366/131450
oai:uvadoc.uva.es:10324/249202021-06-23T13:29:31Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Algoritmos de filtrado colaborativo para recomendación de hilos en foros de cursos MOOC
González Martínez, José Antonio
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
Simposio Internacional de Informática Educativa, SIIE 2016 (18º. 2016. Salamanca)
Este estudio explora los retos y oportunidades del filtrado colaborativo para recomendar hilos en foros de discusión de cursos MOOC. Se consideran métricas clásicas y nuevas para estimar la similitud entre usuarios, se discute la definición de una ground truth y se plantea un estudio experimental, llevado a cabo con datos reales, en el que el sistema hace recomendaciones no obvias con la información disponible en cada día del curso.
2017-08-21T08:00:18Z
2017-08-21T08:00:18Z
2017-08-21T08:00:18Z
2016
info:eu-repo/semantics/conferenceObject
González-Martínez, J.A., Gómez-Sánchez, E., Bote-Lorenzo, M.L. Algoritmos de filtrado colaborativo para recomendación de hilos en foros de cursos MOOC. Proceedings of the XVIII Simposio Internacional de Informática Educativa, SIIE 2016, Salamanca, Spain, September 2016.
978-84-9012-630-1
http://uvadoc.uva.es/handle/10324/24920
spa
https://gredos.usal.es/jspui/handle/10366/131450
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Universidad de Salamanca
oai:uvadoc.uva.es:10324/249262021-10-18T11:43:50Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Una experiencia de tecnología y aprendizaje ubicuo en Educación Física en el medio natural
Gallego Lema, Vanesa
Muñoz Cristóbal, Juan Alberto
Arribas Cubero, Higinio Francisco
Rubia Avi, Bartolomé
En este poster pretendemos presentar un proceso formativo a través del aprendizaje ubicuo con apoyo tecnológico, desarrollado en la asignatura Educación física en el Medio ambiente (EFMN) del grado de Educación primaria, mención e EF y en diferentes centros escolares de Primaria durante el prácticum de algunos de los estudiantes de la asignatura citada.
2017-08-21T08:29:23Z
2017-08-21T08:29:23Z
2017-08-21T08:29:23Z
2016
info:eu-repo/semantics/conferenceObject
Gallego-Lema, V., Muñoz-Cristóbal, J.A., Arribas-Cubero, H.F., Rubia-Avi, B. Technology and ubiquitous learning: an experience in physical education in the natural environment. Proceedings of the Outdoor Physical Education Meeting, Valsaín, Segovia, Spain, July 2016.
978‐84‐608‐9460‐5
http://uvadoc.uva.es/handle/10324/24926
spa
http://educacionfisicanaturaleza.blogspot.com.es/2016/09/actas-de-las-i-jornadas-sobre-educacion.html
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Red Estatal de Educación Física en la Naturaleza (REEFNAT)
oai:uvadoc.uva.es:10324/249322021-10-18T11:44:22Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
A System for Gamifying Ubiquitous Learning Situations Supported by Multiple Technologies
Ortega Arranz, Alejandro
Muñoz Cristóbal, Juan Alberto
Martínez Monés, Alejandra
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
Gamification is the use of game design elements in non-game contexts, and it has reported potential benefits for students. However, the proposals supporting teachers to create gamified ubiquitous learning situations are tied to specific activities and enactment technologies. To
start addressing this issue, we propose a system to help teachers design and deploy these situations involving a variety of technologies frequently used in education
2017-08-21T08:54:57Z
2017-08-21T08:54:57Z
2017-08-21T08:54:57Z
2016
info:eu-repo/semantics/conferenceObject
Ortega-Arranz, A., Muñoz-Cristóbal, J.A., Martínez-Monés, A., Bote-Lorenzo, M.L., Asensio-Pérez, J.I. A System for Gamifying Ubiquitous Learning Situations Supported by Multiple Technologies. Proceedings of the 13th International Conference on Intelligent Tutoring Systems, ITS 2016, Zagreb, Croatia, June 2016.
9783319395838
http://uvadoc.uva.es/handle/10324/24932
10.1007/978-3-319-39583-8
eng
http://www.springer.com/us/book/9783319395821
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Springer
oai:uvadoc.uva.es:10324/249362021-10-18T11:45:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Identifying Factors that Affect Team Formation and Management in MOOCs
Sanz Martínez, María Luisa
Ortega Arranz, Alejandro
Dimitriadis Damoulis, Ioannis
Muñoz Cristóbal, Juan Alberto
Martínez Monés, Alejandra
Bote Lorenzo, Miguel Luis
Rubia Avi, Bartolomé
The integration of Computer-Supported Collaborative Learning (CSCL) in Massive Open Online Courses (MOOCs) is a challenge that several research projects are trying to address. However, team formation and their subsequent management in MOOCs is a complex task, that depends on multiple factors, both pedagogical and technological. This paper analyzes the factors that in
uence team formation in MOOCs, as an initial step towards our overall goal of designing automatic tools to support the dynamic management of teams in MOOCs.
2017-08-21T09:16:21Z
2017-08-21T09:16:21Z
2017-08-21T09:16:21Z
2016
info:eu-repo/semantics/conferenceObject
Sanz-Martínez, L., Ortega-Arranz, A., Dimitriadis, Y., Muñoz-Cristóbal, J.A., Martínez-Monés, A., Bote-Lorenzo, M.L., Rubia-Avi, B. Identifying Factors that Affect Team Formation and Management in MOOCs. Proceedings of the 5th Workshop on Intelligent Support for Learning in Groups at the 13th International Conference on Intelligent Tutoring Systems (ITS 2016), ISLG, Zagreb, Croatia, June 2016.
http://uvadoc.uva.es/handle/10324/24936
eng
http://its2016.its-conferences.com/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/254612021-06-23T13:29:50Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Harmonic Auto-Regularization for Non Rigid Groupwise Registration in Cardiac Magnetic Resonance Imaging
Sanz Estébanez, Santiago Rodrigo
Royuela del Val, Javier
Sevilla Ruiz, María Teresa
Revilla Orodea, Ana
Aja Fernández, Santiago
Alberola López, Carlos
In this paper we present a new approach for non rigid groupwise registration of cardiac magnetic resonance images by means of free-form deformations, imposing a prior harmonic deformation assumption. The procedure proposes a primal-dual framework for solving an equality constrained minimization problem, which allows an automatic estimate of the trade-off between image fi- delity and the Laplacian smoothness terms for each iteration. The method has been applied to both a 4D extended cardio-torso phantom and to a set of voluntary patients. The accuracy of the method has been measured for the synthetic experiment as the dif- ference in modulus between the estimated displacement field and the ground truth; as for the real data, we have calculated the Dice coefficient between the contour manual delineations provided by two cardiologists at end systolic phase and those provided by them at end diastolic phase and, consequently propagated by the registration algorithm to the systolic instant. The automatic pro- cedure turns out to be competitive in motion compensation with other methods even though their parameters have been previously set for optimal performance in different scenarios.
2017-09-08T23:05:06Z
2017-09-08T23:05:06Z
2017-09-08T23:05:06Z
2016
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25461
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254622021-06-23T13:29:51Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Cardio-respiratory motion estimation for compressed sensing reconstruction of free breathing 2D cine MRI
Royuela del Val, Javier
Usman, Muhammad
Cordero Grande, Lucilio
Martín Fernández, Marcos Antonio
Prieto, Claudia
Alberola López, Carlos
In this work a joint cardio-respiratory motion estimation technique is introduced for the compensation of both the respiratory and cardiac motion of the heart during free-breathing cardiac MRI examinations. The proposed technique is combined with an extra-dimensional reconstruction scheme in which respiratory and cardiac motions are resolved. Initial results for 2D cine cardiac MRI are presented for synthetic and real data.
2017-09-08T23:48:30Z
2017-09-08T23:48:30Z
2017-09-08T23:48:30Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25462
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254632021-06-23T13:29:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
An e cient multi-resolution reconstruction scheme with motion compensation for 5D free-breathing whole-heart MRI
Menchón Lara, Rosa María
Royuela del Val, Javier
Godino Moya, Alejandro
Simmross Wattenberg, Federico Jesús
Martín Fernández, Marcos Antonio
Alberola López, Carlos
In this work we propose a novel approach for the reconstruc- tion of 3D isotropic, free-breathing cardiac cine MRI with 100% data e - ciency. The main components are a continuous 3D Golden radial k-space data acquisition, a robust groupwise cardio-respiratory motion estima- tion technique and a multiresolution strategy introduced in a previously proposed compressed sensing reconstruction scheme. Initial results on simulated data show better reconstruction quality than the non-motion compensated counterpart and reduced reconstruction times with respect a single-resolution procedure for equivalent acceleration factors ranging 24.38 to 34.8.
2017-09-08T23:53:40Z
2017-09-08T23:53:40Z
2017-09-08T23:53:40Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25463
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254642021-06-23T13:29:55Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Estimation of healthy and fibrotic tisse distributions in DCE-CMR incorporating CINE-CMR in an EM algorithm
Merino Caviedes, Susana
Cordero Grande, Lucilio
Sevilla Ruiz, María Teresa
Revilla Orodea, Ana
Pérez Rodríguez, María Teresa
Palencia de Lara, César
Martín Fernández, Marcos Antonio
Alberola López, Carlos
Delayed Enhancement (DE) Cardiac Magnetic Resonance (CMR) allows practitioners to identify brosis in the myocardium. It is useful in the di erential diagnosis of Hypertrophic Cardiomyopathy (HCM), and its assessment is of importance in selecting the most ade- quate therapy for a patient. However, it has been stated in the literature that most clinical semiautomatic scar quanti cation methods present high intra- and interobserver variability in the case of HCM. Automatic methods relying on mixture model estimation of the myocardial inten- sity distribution are also subject to variability due to misalignments of the myocardial mask. In this paper, the CINE-CMR image information is incorporated to the estimation of the DE-CMR tissue distributions, without assuming perfect alignment between the two modalities nor the same label partitions in them. For this purpose, we propose an expec- tation maximization algorithm that estimates the DE-CMR distribution parameters, as well as the conditional probabilities of the DE-CMR la- bels with respect to the labels of CINE-CMR, with the latter being an input of the algorithm. Our results show that, compared to applying the original EM in the myocardium, the proposed algorithm is more accu- rate in estimating the myocardial tissue parameters and obtains higher loglikelihood of the scar voxels, as well as a higher Dice coe cient of the subsequent segmentations.
2017-09-09T00:05:21Z
2017-09-09T00:05:21Z
2017-09-09T00:05:21Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25464
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254652021-06-23T13:29:57Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Groupwise Non-Rigid Registration On Multiparametric Abdominal Dwi Acquisitions For Robust Adc Estimation: Comparison With Pairwise Approaches And Different Multimodal Metrics
Sanz Estébanez, Santiago Rodrigo
Peña Nogales, Óscar
Luis García, Rodrigo de
Aja Fernández, Santiago
Alberola López, Carlos
Registration of diffusion weighted datasets remains a challenging task in the process of quantifying diffusion indexes. Respi- ratory and cardiac motion, as well as echo-planar characteristic geometric distortions, may greatly limit accuracy on parameter estimation, specially for the liver. This work proposes a methodology for the non-rigid registration of multiparametric abdomi- nal diffusion weighted imaging by using different well-known metrics under the groupwise paradigm. A three-stage validation of the methodology is carried out on a computational diffusion phantom, a watery solution phantom and a set of voluntary patients. Diffusion estimation accuracy has been directly calculated on the computational phantom and indirectly by means of a residual analysis on the real data. On the other hand, effectiveness in distortion correction has been measured on the phan- tom. Results have shown statistical significant improvements compared to pairwise registration being able to cope with elastic deformations.
2017-09-09T02:04:31Z
2017-09-09T02:04:31Z
2017-09-09T02:04:31Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25465
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254722021-06-23T13:29:58Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Determination of the optimal set of b-values for ADC mapping under a Rician noise assumption
Peña Nogales, Óscar
Hernando, Diego
Aja Fernández, Santiago
Luis García, Rodrigo de
Mapping of the apparent diffusion coefficient (ADC), estimated from a set of diffusion-weighted (DW) images acquired with different b-values, often suffers from low SNR, which can introduce large variance in ADC maps. Unfortunately, there is no consensus on the optimal b-values to maximize the noise performance of ADC map. In this work, we determine the optimal b-values to maximize the noise performance of ADC mapping by using a Cramér-Rao Lower Bound (CRLB) approach under realistic noise assumptions. The strong agreement between the CRLB-based analysis, Monte-Carlo simulations, and ADC phantom experiment, suggests the utility of this approach to optimize DW-MRI acquisitions.
2017-09-10T14:07:58Z
2017-09-10T14:07:58Z
2017-09-10T14:07:58Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25472
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254732021-06-24T10:14:45Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Optimal design of motion-compensated diffusion gradient waveforms
Peña Nogales, Óscar
Luis García, Rodrigo de
Aja Fernández, Santiago
Zhang, Yuxin
H. Holmes, James
Hernando, Diego
Diffusion-Weighted MRI (DW-MRI) often suffers from motion-related artifacts in organs that experience physiological motion. Importantly, organ motion during the application of diffusion gradients results in signal losses, which complicate image interpretation and bias quantitative measures. Motion-compensated gradient designs have been proposed, however they typically result in substantially lower b-values or severe concomitant gradient effects. In this work, we develop an approach for design of first- and second-order motion-compensated gradient waveforms based on a b-value maximization formulation including concomitant gradient nulling, and we compare it to existing techniques. The proposed design provides optimized b-values with motion compensation and concomitant gradient nulling
2017-09-10T14:13:28Z
2017-09-10T14:13:28Z
2017-09-10T14:13:28Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/25473
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/254792021-06-23T13:30:01Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
What information do teachers demand from a computerized classroom? An exploratory analysis
Martínez Monés, Alejandra
Reffay, Christophe
Lécuyer Cabioch, Gwénaëlle
Luengo, Vanda
Adoption of teaching analytics systems at early school levels is scarce. To increase the uptake of these systems by teachers, there is a need of initiatives that enable teachers and designers work together, to allow designers understand teachers’ needs. This paper reports on the initial findings of a study where nineteen teachers were interviewed to elicit their demands in the context of a technologically enabled classroom setup. The results show that teachers demand indicators related to their daily tasks in the context of formal education, and suggest design features that resemble their current practices.
2017-09-11T07:45:20Z
2017-09-11T07:45:20Z
2017-09-11T07:45:20Z
2017
info:eu-repo/semantics/conferenceObject
Martínez-Monés, A., Reffay, Lécuyer-Cabioch, G., Luengo, V., What information do teachers demand from a computerized classroom? An exploratory analysis. Proceedings of the Learning Analytics Summer Institute, Spain 2017, Madrid, July 2017
http://uvadoc.uva.es/handle/10324/25479
eng
https://lasi17.snola.es/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/258152021-06-23T13:30:02Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Analysis of the feasibility of an Array of MEMS microphones to Machinery condition monitoring of fault diagnosis
Val Puente, Lara del
Herráez Sánchez, Marta
Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
Suarez Vivar, Luis
During the last decades, vibration analysis has been used to evaluate condition monitoring and fault diagnosis of complex mechanical systems. The problem associated with these analysis methods is that the employed sensors must be in contact with the vibrant surfaces. To avoid this problem, the current trend is the analysis of the noise, or the acoustic signals, which are directly related with the vibrations, to evaluate condition monitoring and/or fault diagnosis of mechanical systems. Both, acoustic and vibration signals, obtained from a system can reveal information related with its operation conditions. Using arrays formed by digital MEMS microphones, which employ acquisition/processing systems based on FPGA, allows creating systems with a high number of sensors paying a reduced cost. This work studies the feasibility of the use of acoustic images, obtained by an array with 64 MEMS microphones (8x8) in a hemianechoic chamber, to detect, characterize, and, eventually, identify failure conditions in machinery. The resolution obtained to spatially identify the problem origin in the machine under test. The acoustic images are processed to extract different feature patterns to identify and classify machinery failures.
2017-09-21T08:53:08Z
2017-09-21T08:53:08Z
2017-09-21T08:53:08Z
2017
info:eu-repo/semantics/conferenceObject
Boston MA (USA), 25–29 June 2017
http://uvadoc.uva.es/handle/10324/25815
http://dx.doi.org/10.1121/1.4988999
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
The Journal of the Acoustical Society of America
oai:uvadoc.uva.es:10324/258162021-06-23T13:30:03Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Characterization of a Virtual Array based on MEMS microphones for the analysis of acoustic sources
Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
Val Puente, Lara del
Suarez Vivar, Luis
Using arrays with digital MEMS microphones and FPGA-based acquisition/processing systems allows to build systems with hundreds of sensors at a reduced cost. This work analyzes the performance of a virtual array with 6400 MEMS (80 × 80) microphones. The system is composed by a 2D positioning system that places a physical array of 64 microphones (8 × 8) in a grid with 8 x 8 positions, obtaining a spatial aperture of 2 x 2 meters. The measured beampattern is compared with the theoretical one for several frequencies and pointing angles. The beampattern of the physical array is also estimated for each one of the 64 positions used by the positioning system. Also, the measured beampattern and the focusing capacity are analyzed, since beamforming algorithms assume spherical wave due to the large dimensions of the array. Finally, frequency and spatial responses for a set of different acoustic sources are obtained showing angular resolutions of the order of tenths of degree.
2017-09-21T08:58:46Z
2017-09-21T08:58:46Z
2017-09-21T08:58:46Z
2017
info:eu-repo/semantics/conferenceObject
Boston MA (USA), 25–29 June 2017
http://uvadoc.uva.es/handle/10324/25816
http://dx.doi.org/10.1121/1.4988154
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
The Journal of the Acoustical Society of America
oai:uvadoc.uva.es:10324/258182021-06-23T13:30:04Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Could an array of MEMS microphones be used to monitor machinery condition or diagnose failures?
Val Puente, Lara del
Herráez Sánchez, Marta
Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
Suarez Vivar, Luis
During the last decades, vibration analysis has been used to evaluate condition monitoring and fault diagnosis of complex mechanical systems. The problem associated with these analysis methods is that the employed sensors must be in contact with the vibrant surfaces. To avoid this problem, the current trend is the analysis of the noise, or the acoustic signals, which are directly related with the vibrations, to evaluate condition monitoring and/or fault diagnosis of mechani-cal systems. Both, acoustic and vibration signals, obtained from a system can reveal information related with its operation conditions. Using arrays formed by digital MEMS microphones, which employ acquisition/processing systems based on FPGA, allows creating systems with a high number of sensors paying a reduced cost. This work studies the feasibility of the use of acoustic images, obtained by an array with 64 MEMS microphones (8x8) in a hemianechoic chamber, to detect, characterize and, eventually, identify failure conditions in machinery. The resolution obtained to spatially identify the problem origin in the machine under test. The acous-tic images are processed to extract different feature patterns to identify and classify machinery failures.
2017-09-21T09:10:37Z
2017-09-21T09:10:37Z
2017-09-21T09:10:37Z
2017
info:eu-repo/semantics/conferenceObject
Londres (Reino Unido), 23-27July 2017
http://uvadoc.uva.es/handle/10324/25818
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/258192021-06-23T13:30:05Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Acoustic sources analysis using a virtual array based on MEMS microphones
Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
Val Puente, Lara del
Suarez Vivar, Luis
Suarez, David
The use of arrays with digital MEMS microphones and FPGA-based acquisition/processing sys-tems allows building systems with hundreds of sensors at a reduced cost. This work analyses the performance of a virtual array with 1600 MEMS (40 x 40) microphones. The system is com-posed by a 2D positioning system that places a physical array of 64 microphones (8 x 8) in a grid with 5x5 positions, obtaining a spatial aperture of 1x1 meters. The measured beampattern is compared with the theoretical one for several frequencies and pointing angles. The beampattern of the physical array is also estimated for each one of the 64 positions used by the positioning system. Also, the measured beampattern and the focusing capacity are analysed, since beam-forming algorithms assume spherical wave due to the large dimensions of the array. Finally, frequency and spatial responses for a set of different acoustic sources are obtained showing an-gular resolutions of the order of tenths of degree.
2017-09-21T09:14:54Z
2017-09-21T09:14:54Z
2017-09-21T09:14:54Z
2017
info:eu-repo/semantics/conferenceObject
Londres (Reino Unido), 23-27July 2017
http://uvadoc.uva.es/handle/10324/25819
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/258242021-06-23T13:30:07Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Design and Characterization of a 2D Array of MEMS Microphones for Acoustical Imaging
Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
Val Puente, Lara del
Suarez Vivar, Luis
This paper presents the characterization of each of the MEMS microphones which form a uniform planar array used for acoustical imaging. These microphones show an esentialy flat frequency response, with a ±2dB variation between all sensors. This paper also shows the design and the acoustic characterization of the planar array of MEMS microphones. Analyzing the acoustic array characterization it was observed that as the variations of the measured beampattern, with respect to the theoretical one, are limited, it is not necessary to apply calibration techniques to the array.
2017-09-21T10:04:17Z
2017-09-21T10:04:17Z
2017-09-21T10:04:17Z
2016
info:eu-repo/semantics/conferenceObject
Barcelona, 22-23 September 2016
http://uvadoc.uva.es/handle/10324/25824
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
oai:uvadoc.uva.es:10324/313762021-06-23T13:30:12Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Obtención de la señal de sincronismo cardíaco a partir de los datos del k-espacio en IRM cine cardiaca
Godino Moya, Alejandro
Cloquell, Thibauld
Royuela del Val, Javier
Martín Fernández, Marcos Antonio
Alberola López, Carlos
La IRM cine cardiaca se considera la prueba de referencia para imagen anatómica y funcional del corazón. En una adquisición típica se necesita un monitor de ECG externo para sincronizar la adquisición de datos con el movimiento del corazón, lo que incrementa el tiempo total de la prueba. El objetivo de esta propuesta es obtener la señal de sincronismo cardíaco a partir de los propios datos del k-espacio adquiridos, tanto en apnea como en respiración libre, eliminando así la necesidad de utilizar dispositivos adicionales.
2018-09-03T17:43:30Z
2018-09-03T17:43:30Z
2018-09-03T17:43:30Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31376
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/313752021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Optimal Diffusion-weighting Gradient Waveform Design (ODGD): Formulation and Experimental Validation
Peña Nogales, Óscar
Zhang, Yuxin
Luis García, Rodrigo de
Aja Fernández, Santiago
H. Holmes, James
Hernando, Diego
Diffusion-Weighted MRI often suffers from signal attenuation due to long TE, sensitivity to physiological motion, and dephasing due to concomitant gradients (CGs). These challenges complicate image interpretation and may introduce bias in quantitative diffusion measurements. Motion moment-nulled diffusion-weighting gradients have been proposed to compensate motion, however, they frequently result in high TE and suffer from CG effects. In this work, the Optimal Diffusion-weighting Gradient waveform Design method that overcomes limitations of state-of-the-art waveforms is revisited and validated in phantom and in-vivo experiments. These diffusion-weighting gradient waveforms reduce the TE and increase the SNR of state-of-the-art waveforms without and with CG-nulling.
2018-09-03T17:40:04Z
2018-09-03T17:40:04Z
2018-09-03T17:40:04Z
2018
info:eu-repo/semantics/conferenceObject
International Society of Magnetic Resonance in Medicine 26th Annual, Paris,2018
http://uvadoc.uva.es/handle/10324/31375
eng
http://archive.ismrm.org/2018/1615.html
info:eu-repo/semantics/openAccess
oai:uvadoc.uva.es:10324/313772021-06-23T13:30:14Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Avoiding additional hardware and recovering cardiac information from k-space
Godino Moya, Alejandro
Cloquell, Thibauld
Royuela del Val, Javier
Martín Fernández, Marcos Antonio
Alberola López, Carlos
MRI is considered the gold standard for the imaging of cardiac function and anatomy. In regular cardiac MRI, an external ECG monitor is required in order to synchronize the data acquisition with the motion of the heart. However, this additional hardware increases the examination, preparation and acquisition times. The aim of this proposal is to avoid the necessity of this additional hardware in cardiac MRI examinations by developing an automatic method to recover the cardiac cycle information directly from the MRI data both in breath-hold and free breathing situations. Some different scenarios have been considered and some methods have been proposed with good performances, obtaining errors between 1-4%.
2018-09-03T17:55:09Z
2018-09-03T17:55:09Z
2018-09-03T17:55:09Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31377
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/313782021-06-23T13:30:08Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
G-CASPR and VDRad: extreme cases of a continuum. Intermediate may be better.
Godino Moya, Alejandro
Royuela del Val, Javier
Menchón Lara, Rosa María
Martín Fernández, Marcos Antonio
Alberola López, Carlos
Different approaches that use Cartesian trajectories with spiral profiles and golden angle step have been proposed to accelerate MRI acquisition. G-CASPR is characterized by a scheme with uniform k-space sampling and it is usually applied to static MRI. Nevertheless, compressed sensing shows better results if the center of k-space is sampled more densely. VDRad is a variable density sampling scheme that has been reported for abdominal imaging. VDRad, however, has the drawback that some positions in the k-space are repeatedly acquired, decreasing efficiency. We define a versatile sampling scheme that varies continuously from the G-CASPR to VDRad. Our goal is to determine whether intermediate configurations can provide better sampling schemes for cine cardiac MRI applications.
2018-09-03T18:14:47Z
2018-09-03T18:14:47Z
2018-09-03T18:14:47Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31378
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/313792021-06-23T13:30:23Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Space-time variant weighted regularization improves motion reconstruction in compressed sensing accelerated cardiac cine MRI
Royuela del Val, Javier
Godino Moya, Alejandro
Menchón Lara, Rosa María
Martín Fernández, Marcos Antonio
Alberola López, Carlos
In compressed sensing (CS) dynamic MRI, temporal sparsity is commonly exploited introducing a temporal regularization that affects the dynamic behavior of the images in moving regions. While previous works proposed to combine different sparsity terms accounting for dynamic and static regions in the image, in this work we propose a methodology to dynamically adapt the temporal regularization according to the presence of motion. The proposed method is based on a robust registration technique for non-rigid motion estimation. A variable Density k-space sampling it is applied to highly accelerated breath-hold cine data.
2018-09-03T18:22:18Z
2018-09-03T18:22:18Z
2018-09-03T18:22:18Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31379
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/313802021-10-15T06:56:10Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Robust Windowed Harmonic Phase Analysis with a Single Acquisition
Sanz Estébanez, Santiago Rodrigo
Cordero Grande, Lucilio
Martín Fernández, Marcos Antonio
Alberola López, Carlos
The HARP methodology is a widely extended procedure for cardiac tagged magnetic resonance imaging since it is able to analyse local mechanical behaviour of the heart; extensions and improvements of this method have also been reported since HARP was released. Acquisition of an over-determined set of orientations is one of such alternatives,
which has notably increased HARP robustness at the price of increasing examination time. In this paper, we explore an alternative to this method based on the use of multiple peaks, as opposed to multiple orientations, intended for a single acquisition. Performance loss is explored with respect to multiple orientations in a real setting. In addition, we have assessed, by means of a computational phantom, optimal tag orientations and spacings of the stripe pattern by minimizing the Frobenius norm of the difference between the ground truth and the estimated material deformation gradient tensor. Results indicate that, for a single acquisition, multiple peaks as opposed to multiple orientations, are indeed preferable
2018-09-03T19:56:41Z
2018-09-03T19:56:41Z
2018-09-03T19:56:41Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31380
spa
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/313862021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Joint Image Reconstruction and Phase Corruption Maps Estimation in Multi-Shot Echo Planar Imaging
Rabanillo Viloria, Iñaki Manuel
Sanz Estébanez, Santiago Rodrigo
Aja Fernández, Santiago
Hajnal, Joseph
Alberola López, Carlos
Cordero Grande, Lucilio
Procedimiento para corregir los errores de fase al combinar diversos shots en adquisición de resonancia de difusión.
2018-09-04T08:38:31Z
2018-09-04T08:38:31Z
2018-09-04T08:38:31Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31386
eng
info:eu-repo/semantics/openAccess
MICCAI Society (Medical Image Computing and Computer Assisted Intervention Society)
oai:uvadoc.uva.es:10324/313872021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Joint Non-rigid Motion and Image MRI SENSE Reconstruction
Royuela del Val, Javier
Godino Moya, Alejandro
Menchón Lara, Rosa María
Sanz Estébanez, Santiago Rodrigo
Simmross Wattenberg, Federico Jesús
Martín Fernández, Marcos Antonio
Alberola López, Carlos
Metodología de reconstrucción de imagen de resonancia cardiaca a partir de una única plantilla de imagen que se deforma, según la información adquirida en el k-espacio, para dar lugar a las diferentes fases cardiacas.
2018-09-04T08:44:51Z
2018-09-04T08:44:51Z
2018-09-04T08:44:51Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31387
spa
info:eu-repo/semantics/openAccess
oai:uvadoc.uva.es:10324/313892021-06-24T10:13:33Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
ADC Measurement Accuracy in Quantitative Diffusion Phantoms using Reduced Field-Of-View and Multi-Shot Acquisitions
Rabanillo Viloria, Iñaki Manuel
H. Holmes, James
Guidon, Arnaud
Aja Fernández, Santiago
Alberola López, Carlos
Reeder, Scott
Hernando, Diego
Diffusion MRI (dMRI) is typically performed using single-shot Echo Planar Imaging (ssEPI). However, the long echo-trains in ssEPI result in significant image distortion in the presence of static B0 field inhomogeneties. Several techniques have been proposed for reducing the echo-train length in dMRI in order to reduce image distortions compared to ssEPI. Reduced-Field-of-View (rFOV) imaging has been demonstrated in regions such as the spinal cord [1] and pancreas [2]. Multi-shot EPI (msEPI) is based on an interleaved segmented k-space acquisition that enables full FOV dMRI with reduced distortion (upon correction of inter-shot phase inconsistencies) [3]. Both rFOV and msEPI have been shown to provide high quality diffusion weighted images. However, their ability to provide accurate quantitative diffusion measures has not been fully characterized. In this study we extend the work from Banerjee et al [4] by conducting controlled experiments in two recently proposed quantitative diffusion phantoms to compare the apparent diffusion coefficient (ADC) measured from three diffusion sequences: ssEPI, rFOV and msEPI.
2018-09-04T11:17:40Z
2018-09-04T11:17:40Z
2018-09-04T11:17:40Z
2016
info:eu-repo/semantics/conferenceObject
ISMRM Workshop on Breaking the Barriers of Diffusion MRI
http://uvadoc.uva.es/handle/10324/31389
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Attribution 4.0 International
oai:uvadoc.uva.es:10324/314012021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Scalable Team-Based Software Engineering Education via Automated Systems
Ju, An
Fu, Xiao
Zeitsoff, Joshua
Dimitriadis Damoulis, Ioannis
Fox, Armando
Hemani, Adnan
Team projects are essential in modern software engineering education. Students collaboratively build a piece of software that addresses practical issues, through which they practice both technical skills and soft skills, in a setting that resembles the real working environment. However, team projects are complex. Previous studies have explored various design spaces, such as team formation [1], project selection [2], team coaching [3], and student evaluation [4];
while others have reported experience regarding the design, organization, teaching, and evolution of a project-based software engineering curriculum [5][6][7][8]. The complexity of
team projects explains why we rarely see large-scale software engineering courses with a team project. In this paper, we try to address the scalability issue of software engineering projects and lay out our blueprint for enabling the learning of software engineering with a team project via MOOCs.
2018-09-05T12:34:10Z
2018-09-05T12:34:10Z
2018-09-05T12:34:10Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31401
eng
info:eu-repo/grantAgreement/EC/H2020/669074
info:eu-repo/grantAgreement/EC/H2020/731685
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314032021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Validating performance of group formation based on homogeneous engagement criteria in MOOCs
Sanz Martínez, María Luisa
Martínez Monés, Alejandra
Bote Lorenzo, Miguel Luis
Dimitriadis Damoulis, Ioannis
Active pedagogies can improve the pedagogical effectiveness of
MOOCs. Group formation, an essential step in the design of small-group learning
activities, can be challenging in MOOCs given the scale and the wide variety of
students’ behaviors in such contexts. In this paper, we further analyze the
suitability of applying the students’ engagement in the course as grouping
criterion to form small groups in MOOC contexts. The impact of a grouping
strategy based on requiring homogeneity among the students’ engagement of the
group is examined in a real MOOC context. In a preliminary stage the results
have been analyzed in terms of peer interactions, active students per team and
students’ satisfaction. These results have been also compared with those in prior
interventions in real MOOCs, thus validating previous findings about the
suitability of this approach. The role of the timing of grouping was also examined
by carrying out two collaborative activities at different weeks (the fourth and the
sixth). A consistent improvement of all indicators was observed in the second
intervention and its possible causes are discussed.
2018-09-05T14:54:10Z
2018-09-05T14:54:10Z
2018-09-05T14:54:10Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31403
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314042021-10-18T11:45:56Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Learning Analytics with Google Classroom: Exploring the possibilities
Martínez Monés, Alejandra
Reffay, Christophe
Hoyos Torío, Javier
Muñoz Cristóbal, Juan Alberto
Google Classroom (GC) is gaining momentum in the educational
milieu, but its functionalities are limited. Learning analytics
applications integrated with GC can help to face these limitations,
but to reach this aim, developers need access to the data generated
by GC’s users. This paper reports on the results of an analysis of
the existing alternatives to collect data from GC. The study is
based on the analysis of the documentation provided by the
involved tools. The analysis shows that GC’s API is a potential
source of data about the activity of the users in GC-enabled
settings, but that the information it provides is limited. Further
work is needed to explore if Chrome OS synchronization
functions can deliver more detailed information about GC usage,
thus enabling for more advanced learning analytics applications.
2018-09-05T14:58:55Z
2018-09-05T14:58:55Z
2018-09-05T14:58:55Z
2017
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31404
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314052021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Reflexiones para la introducción de la Colaboración y la Gamificación en MOOC
García Sastre, Sara
Ortega Arranz, Alejandro
Sanz Martínez, María Luisa
Villagrá Sobrino, Sara Lorena
A pesar de los beneficios de los MOOC (Massive Open Online Courses) 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. Así, la aplicación de pedagogías activas se presenta como una posible estrategia para intentar cambiar ese modelo y tratar de mejorar los resultados de aprendizaje. El presente trabajo analiza los posibles beneficios de la gamificación y la colaboración para fomentar/motivar la participación de los estudiantes en los MOOC. Para ello, se muestran evidencias de innovaciones pedagógicas realizadas en los diseños de tres MOOC con el fin de mejorar los mecanismos de uso de gamificación y colaboración.
2018-09-05T15:05:27Z
2018-09-05T15:05:27Z
2018-09-05T15:05:27Z
2018
info:eu-repo/semantics/conferenceObject
San Sebastián, Spain
http://uvadoc.uva.es/handle/10324/31405
spa
info:eu-repo/semantics/openAccess
oai:uvadoc.uva.es:10324/314062021-10-19T18:23:32Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Monitoring Collaborative Learning Activities: Exploring the Differential Value of Collaborative Flow Patterns for Learning Analytics
Rodríguez Triana, María Jesús
Prieto, Luis P.
Martínez Monés, Alejandra
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
Collaborative learning flow patterns (CLFPs) en code solutions to recurrent pedagogical problems, which have been successfully applied to the design of learning experiences. However, the pedagogical knowledge encoded in these patterns has seldom been exploited in learning analytics (LA). This paper analyzes four of the most common CLFPs to extract the intrinsic
constraints that lead to a successful collaborative learning activity, and use them to enhance existing LA solutions. To understand the added value of applying such codified knowledge in LA,
we present evidence from five authentic case studies in which such constraints aided university teachers in monitoring complex collaborative scripts. The results not only illustrate quantitatively
such added value but also unearth qualitative benefits, such as raising practitioners awareness about how the current state of activities may affect future phases of the script.
2018-09-05T15:09:57Z
2018-09-05T15:09:57Z
2018-09-05T15:09:57Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31406
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314072021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Supporting Group Formation in Ongoing MOOCs using Actionable Predictive Models
Er, Erkan
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
Although the massive and open nature of
MOOCs necessitates more technology support for instructors,
existing prediction research has been barely capable of offering
real-world solutions. One critical case where MOOC
instructors could benefit from real-time technological support
is the design of collaborative activities, in particular group
formation. In this regard, this research work investigated the
use of in-situ learning technique to produce useful and
actionable information that could assist instructors in group
formation while the course continues. Focusing on a particular
MOOC context, a predictive model was created to compute the
probability that students would participate in group
discussions or not. Using these probability scores, actual group
behavior was also predicted for three cases: at least 2, 3 or 4
different students would post in group discussions. According
to the results, the model was able to accurately predict
individual student behavior as well as group behavior before
the actual collaborative activity had taken place, suggesting its
potential for real-time use. Future research involves the
exploration of other approaches for creating actionable
predictions and the application of the predictions in practice in
an ongoing MOOC.
2018-09-05T15:14:30Z
2018-09-05T15:14:30Z
2018-09-05T15:14:30Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31407
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314082021-10-19T07:49:21Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
The teacher in the loop: customizing multimodal Learning Analytics for blended learning
Rodríguez Triana, María Jesús
Prieto, Luis P.
Martínez Monés, Alejandra
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
In blended learning scenarios, evidence needs to be gathered from digital and physical spaces to obtain a more complete view of the teaching and learning processes. However, these scenarios are highly heterogeneous, and the varying data sources available in each particular context can condition the accuracy, relevance, interpretability and actionability of the Learning Analytics (LA) solutions, affecting also the user’s sense of agency and trust in such solutions. To aid stakeholders in making use of learning analytics, we propose a process to involve teachers in customizing multimodal LA (MMLA) solutions, adapting them to their particular blended
learning situation (e.g., identifying relevant data sources and metrics). Since measuring the added value of adopting an LA solution is not straightforward, we also propose a concrete method for doing so. The results obtained from two case studies in authentic, blended computer-supported collaborative learning settings show an improvement in the sensitivity and F1 scores of the customized MMLA solution. Aside from these quantitative improvements, participant teachers reported both an increment in the effort involved, but also increased relevance, understanding and actionability of the results.
2018-09-05T15:18:45Z
2018-09-05T15:18:45Z
2018-09-05T15:18:45Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31408
eng
info:eu-repo/grantAgreement/EC/H2020/669074
info:eu-repo/grantAgreement/EC/H2020/731685
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314092021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Creating Engaging Experiences in MOOCs through In-Course Redeemable Rewards
Ortega Arranz, Alejandro
Kalz, Marco
Martínez Monés, Alejandra
Gamification strategies have been proposed to mitigate student disengagement and dropouts in massive online environments, due to the positive results shown by these strategies at lower scales. Among various gamification strategies, redeemable rewards have been identified as an effective element to intrinsically motivate students and increase their engagement in educational settings, including MOOCs. Yet, effective design, implementation and enactment of this gamification strategy in MOOC contexts might face new challenges, given the unique
characteristics of these learning settings such as massiveness. As an attempt to help teachers use redeemable rewards in MOOCs, this paper analyzes the characteristics of MOOCs that influence its integration and presents a proposal of a system supporting the design, implementation and enactment of such rewards. The envisioned system is illustrated by a scenario that describes the main features of this system for teachers and students.
2018-09-05T15:22:43Z
2018-09-05T15:22:43Z
2018-09-05T15:22:43Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31409
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/314102021-07-06T08:34:16Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Comparative study of MOOC forums: Does course subject matter?
Ntourmas, Anastasios
Avouris, Nikolaos
Daskalaki, Sophia
Dimitriadis Damoulis, Ioannis
Discussion forums are considered important tools for promoting learning in Massive Open Online
Courses (MOOCs). They involve learner to learner and learner to instructor discussions. An interesting research question is related to the effect of the subject matter on the characteristics of social networks of MOOCs’ discussion forums. Being motivated by Social Centrality Theory, this study aims at further enhancing our understanding of how social centrality is associated with the learners’ course achievement within courses in different subjects (e.g. technology vs. humanities). To achieve this, we performed analysis of the discussion forums of two MOOCs of similar size and educational context, one on Programming and the other on History. The study revealed that centrality of learners played more important role in the technology course than the humanities course in relation to course achievement.
2018-09-05T15:28:14Z
2018-09-05T15:28:14Z
2018-09-05T15:28:14Z
2018
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/31410
eng
info:eu-repo/semantics/restrictedAccess
oai:uvadoc.uva.es:10324/334932021-06-23T13:30:32Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Implementation of a Testbed to Analysis a SDN Based GPON
Azofra Ovejero, Javier Néstor
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Ruíz, F. J.
Vega, C.
Fernández C., David J.
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
A real end-to-end SDN based GPON scenario to provide a fast, efficient and accurate QoS management is proposed. It is designed to support a novel network management model that permits residential users to control their bandwidth network resources.
2018-12-17T13:47:17Z
2018-12-17T13:47:17Z
2018-12-17T13:47:17Z
2018
info:eu-repo/semantics/conferenceObject
2018 European Conference on Optical Communication (ECOC). 23-27 Sept. 2018, Rome, Italy
978-1-5386-4862-9
http://uvadoc.uva.es/handle/10324/33493
https://doi.org/10.1109/ECOC.2018.8535516
eng
https://ieeexplore.ieee.org/document/8535516
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335182021-06-23T13:30:33Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Application of Artificial Intelligence Techniques in Optical Networks
Mata, Javier
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Merayo Álvarez, Noemí
Kumar Singh, Sandeep
Jukan, Admela
Chamania, Mohit
We provide an overview of artificial intelligence techniques and their use in optical communication systems and networks with the aim of improving performance. Areas of application include optical transmission, performance monitoring, quality of transmission monitoring, as well as optical network planning and operation.
2018-12-18T10:03:48Z
2018-12-18T10:03:48Z
2018-12-18T10:03:48Z
2018
info:eu-repo/semantics/conferenceObject
2018 IEEE Photonics Society Summer Topical Meeting Series (SUM), 9-11 July 2018, Waikoloa Village, Hawaii, USA
978-1-5386-5343-2
http://uvadoc.uva.es/handle/10324/33518
https://doi.org/10.1109/PHOSST.2018.8456691
eng
https://ieeexplore.ieee.org/document/8456691
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335192021-06-23T13:30:38Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Genetic Algorithm for Effective Service Mapping in the Optical Backhaul of 5G Networks
Ruiz Pérez, Lidia
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Khodashenas, Pouria S.
Pedreno Manresa, José Juan
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Pavón Marino, Pablo
Siddiqui, Shuaib
Mata, Javier
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
A genetic algorithm is proposed to map virtual network functions in computing resources over 5G networks with an optical backhauling system. The algorithm outperforms other proposals in terms of blocking ratio and active CPU cores utilization.
2018-12-18T10:33:38Z
2018-12-18T10:33:38Z
2018-12-18T10:33:38Z
2018
info:eu-repo/semantics/conferenceObject
2018 20th International Conference on Transparent Optical Networks (ICTON), 1-5 July 2018, Bucharest, Romania
978-1-5386-6605-0
http://uvadoc.uva.es/handle/10324/33519
https://doi.org/10.1109/ICTON.2018.8473766
eng
https://ieeexplore.ieee.org/document/8473766
info:eu-repo/grantAgreement/EC/H2020/671596
info:eu-repo/grantAgreement/EC/H2020/761727
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335202021-06-23T13:30:34Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Supervised Machine Learning Techniques for Quality of Transmission Assessment in Optical Networks
Mata, Javier
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Aguado Manzano, Juan Carlos
Merayo Álvarez, Noemí
Ruiz Pérez, Lidia
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
Tomkos, Ioannis
We propose and compare a number of machine learning models to classify unestablished lightpaths into high or low quality of transmission (QoT) categories in impairment-aware wavelength-routed optical networks. The performance of these models is evaluated in long haul communication networks and compared to previous proposals. Results show that, especially random forests and bagging trees approaches, significantly reduce the required computing time to classify the QoT of a given lightpath, while accuracy remains around 99.9%.
2018-12-18T11:03:14Z
2018-12-18T11:03:14Z
2018-12-18T11:03:14Z
2018
info:eu-repo/semantics/conferenceObject
2018 20th International Conference on Transparent Optical Networks (ICTON), 1-5 July 2018, Bucharest, Romania
978-1-5386-6605-0
http://uvadoc.uva.es/handle/10324/33520
https://doi.org/10.1109/ICTON.2018.8473819
eng
https://ieeexplore.ieee.org/document/8473819
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335492021-06-23T13:30:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Comparing Different Types of Flexibility when Solving the RSA Problem in EONs
Ruiz Pérez, Lidia
González, I.
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
Elastic Optical Networks (EON) are seen as an essential technology to implement the backhaul of Future Internet allowing the deployment of emerging paradigms like the Internet of Things (IoT), Tactile Internet, or Industry 4.0. When designing those Elastic Optical Networks (EONs), the Routing and Spectrum Assignment (RSA) problem has to be solved. In this paper, we analyse the effect of using two types of flexibility in a well‑known RSA method. A simulation study will be presented with the main results of this comparison.
2018-12-19T09:50:25Z
2018-12-19T09:50:25Z
2018-12-19T09:50:25Z
2017
info:eu-repo/semantics/conferenceObject
2017 International Conference on Computational Science and Computational Intelligence (CSCI), 14-16 Dec. 2017, Las Vegas, USA.
978-1-5386-2652-8
http://uvadoc.uva.es/handle/10324/33549
https://doi.org/10.1109/CSCI.2017.236
eng
https://ieeexplore.ieee.org/document/8560998
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335522021-06-23T13:30:36Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
A SVM approach for lightpath QoT estimation in optical transport networks
Mata, Javier
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Aguado Manzano, Juan Carlos
Merayo Álvarez, Noemí
Ruiz Pérez, Lidia
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
A novel quality of transmission (QoT) estimator based on support vector machines (SVM) is proposed for classifying optical connections (lightpaths) into high or low quality categories in impairment-aware wavelength-routed optical networks (WRONs). The performance of the SVM-based estimator is evaluated in a long haul communications network and compared to previous semi-analytical and cognitive proposals. Results show that the SVM approach significantly reduces the necessary computing time to estimate the QoT of a given lightpath, critical aspect of design in these networks, and even slightly improves accuracy.
2018-12-19T10:01:20Z
2018-12-19T10:01:20Z
2018-12-19T10:01:20Z
2017
info:eu-repo/semantics/conferenceObject
2017 IEEE International Conference on Big Data (Big Data), 11-14 Dec. 2017, Boston, USA.
978-1-5386-2715-0
http://uvadoc.uva.es/handle/10324/33552
https://doi.org/10.1109/BigData.2017.8258545
eng
https://ieeexplore.ieee.org/document/8258545
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335542022-06-28T11:40:07Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Testbed laboratory for the physical analysis of gigabit passive optical access networks (GPONs)
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Marcos Miguel, Carlos
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
The following topics are dealt with: protocols; telecommunication computing; cloud computing; mean square error methods; 5G mobile communication; optical fibre subscriber loops; optical fibre networks; passive optical networks; optical time-domain reflectometry; computer aided instruction.
2018-12-19T10:08:51Z
2018-12-19T10:08:51Z
2018-12-19T10:08:51Z
2017
info:eu-repo/semantics/conferenceObject
56th FITCE Congress, 14-15 Sept. 2017, Madrid, Spain
978-1-5386-0566-0
http://uvadoc.uva.es/handle/10324/33554
https://doi.org/10.1109/FITCE.2017.8093009
eng
https://ieeexplore.ieee.org/document/8093009
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335582021-06-23T13:30:40Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
NFV-based QoS provision for Software Defined Optical Access and residential networks
Flores Moyano, Ricardo
Fernández C., David J.
Bellido, Luis
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Miguel Jiménez, Ignacio de
The promises of SDN and NFV technologies to boost innovation and to reduce the time-to-market of new services is changing the way in which residential networks will be deployed, managed and maintained in the near future. New user-centric management models for residential networks combining SDN-based residential gateways and cloud technologies have already been proposed, providing flexibility and ease of deployment. Extending the scope of SDN technologies to optical access networks and bringing cloud technologies to the edge of the network enable the creation of advanced residential networks in which complex service function chains can be established to provide traffic differentiation. In this context, this paper defines a novel network management model based on a user-centric approach that allows residential users to define and control access network resources and the dynamic provision of traffic differentiation to fulfill QoS requirements.
2018-12-19T10:25:04Z
2018-12-19T10:25:04Z
2018-12-19T10:25:04Z
2017
info:eu-repo/semantics/conferenceObject
2017 IEEE/ACM 25th International Symposium on Quality of Service (IWQoS), 7 July 2017, Vilanova i la Geltru, Spain
978-1-5386-2704-4
http://uvadoc.uva.es/handle/10324/33558
https://doi.org/10.1109/IWQoS.2017.7969142
eng
https://ieeexplore.ieee.org/document/7969142
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/335592021-06-23T13:30:37Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Techno-economic comparison of dynamic traffic grooming strategies for elastic optical networks
Fernández, Sara
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Castro, Jesús Javier
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Ruiz Pérez, Lidia
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
We extend past work presented at ICTON 2015, where we reviewed and extended a number of dynamic traffic grooming algorithms proposed by Zhang et al. for elastic optical networks. In that paper we showed that, on the one hand, different grooming policies lead to different connection blocking ratios and have different associated economic costs. On the other hand, different types of transceivers (supporting a single type of modulation format, or being able to generate different ones) also lead to different results in terms of those parameters: blocking ratio and cost. So, a question arises: what is the best option when designing an elastic optical network? Is it better to use a cost-effective grooming policy with transceivers supporting several modulations, or to use cheaper fixed-modulation transceivers combined with an effective policy in terms of blocking ratio? In this paper, we analyze which combination of transceiver type and grooming policy has advantages from a techno-economic perspective (considering both CAPEX and OPEX), while providing a target performance in terms of blocking ratio.
2018-12-19T10:32:21Z
2018-12-19T10:32:21Z
2018-12-19T10:32:21Z
2017
info:eu-repo/semantics/conferenceObject
2017 19th International Conference on Transparent Optical Networks (ICTON), 2-6 July 2017, Girona, Spain
http://uvadoc.uva.es/handle/10324/33559
https://doi.org/10.1109/ICTON.2017.8025127
eng
https://ieeexplore.ieee.org/document/8025127
info:eu-repo/semantics/openAccess
© 2018 IEEE
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/370442021-06-23T13:30:42Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Informing the design of collaborative activities in MOOCs using actionable predictions
Er, Erkan
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
With the aim of supporting instructional designers in setting up collaborative learning activities in MOOCs, this paper derives prediction models for student participation in group discussions. The salient feature of these models is that they are built using only data prior to the learning activity, and can thus provide actionable predictions, as opposed to post-hoc approaches common in the MOOC literature. Some learning design scenarios that make use of this actionable information
are illustrated.
2019-07-16T10:00:54Z
2019-07-16T10:00:54Z
2019-07-16T10:00:54Z
2019
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/37044
eng
https://learningatscale.acm.org/las2019/
info:eu-repo/semantics/openAccess
ACM
oai:uvadoc.uva.es:10324/386622021-06-23T13:30:43Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Quality Assurance Methods Assessing Instructional Design in MOOCs that implement Active Learning Pedagogies: An evaluative case study
Aloizou, Valeria
Villagrá Sobrino, Sara Lorena
Martínez Monés, Alejandra
Asensio Pérez, Juan Ignacio
García Sastre, Sara
Since more and more Massive Open Online Courses (MOOCs) appear, constituting an innovative part of online education, they should also undergo quality assurance to assess their pedagogical design similarly to other
online courses. Recently, new studies have appeared presenting quality assurance methods (QA) for assessing the instructional design in MOOCs with pedagogical innovations, like those implementing active learning pedagogies (e.g.
collaboration, gamification), which provide designers and instructors with useful strategies in order to design more interactive MOOCs. However, it is not
that clear how these efforts are being addressed and up to which point are appropriate to assess active learning pedagogies. Therefore, a Systematic Literature Review (SLR) was conducted to identify the most mature existing MOOC
QA methods. Afterwards, an evaluative case study was carried out, based on the
Evaluand-oriented Responsive Evaluation Model (EREM), to apply the selected
methods to a MOOC implementing active learning pedagogies. As the results
suggest, the instruments of the selected QA methods need enrichment to assess
effectively the instructional design based on active learning pedagogies, by
providing specific questions proper for this kind of MOOCs or, by stating the
underlying pedagogical model clearly so that the designers could consider beforehand if it is appropriate or not for their case. The results of the study are a
first step to define new, enriched quality assessment methods for MOOCs that
apply active learning approaches.
2019-10-21T11:43:24Z
2019-10-21T11:43:24Z
2019-10-21T11:43:24Z
2019
info:eu-repo/semantics/conferenceObject
Calise, M. et al. (eds.). EMOOCs 2019: Sixth European MOOCs Stakeholders Summit. CEUR: Napoles, Italy, 2019. p. 14-19
1613-0073
http://uvadoc.uva.es/handle/10324/38662
eng
http://ceur-ws.org/Vol-2356/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
CEUR Workshop Proceedings
oai:uvadoc.uva.es:10324/386632021-06-23T13:30:44Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Exploring the Problems Experienced by Learners in a MOOC Implementing Active Learning Pedagogies
Topali, Paraskevi
Ortega Arranz, Alejandro
Er, Erkan
Martínez Monés, Alejandra
Villagrá Sobrino, Sara Lorena
Dimitriadis Damoulis, Ioannis
Although Massive Open Online Courses (MOOCs) have been reported as an effective educational tool offering numerous opportunities in online learning, the high dropout rates and the lack of learners’ motivation are factors concerning researchers and instructors. The one-size-fits-all instructional approach that most courses follow, failing to address the individual needs of learners, has been seen as their weakest point. Recent efforts focus on the inclusion of active learning pedagogies in MOOCs to stimulate the interaction among the participants and to keep them engaged. However, taking into account that in these massive contexts the learners face several issues while trying to keep up with the course, the incorporation of active learning strategies may introduce additional problems to the learning process. This study explores the problems that learners experienced in a MOOC implementing collaboration and gamification strategies. As the results reveal, the introduction of collaborative learning activities can generate additional problems to learners and for that reason, a careful design and a proper scaffolding is needed in an early stage to overcome the problems that will occur. No significant problems were reported regarding the implementation of gamification elements.
2019-10-21T12:48:58Z
2019-10-21T12:48:58Z
2019-10-21T12:48:58Z
2019
info:eu-repo/semantics/conferenceObject
Calise M. et al. (eds). EMOOCs 2019: Sixth European MOOCs Stakeholders Summit. Cham: Springer, 2019, p. 81-90
978-3-030-19875-6
http://uvadoc.uva.es/handle/10324/38663
10.1007/978-3-030-19875-6_10
eng
https://link.springer.com/chapter/10.1007%2F978-3-030-19875-6_10
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer Nature
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Springer Link
oai:uvadoc.uva.es:10324/386702021-10-19T07:26:58Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Error 404- Struggling Learners Not Found” Exploring the Behavior of MOOC Learners.
Topali, Paraskevi
Ortega Arranz, Alejandro
Dimitriadis Damoulis, Ioannis
Martínez Monés, Alejandra
Villagrá Sobrino, Sara Lorena
Asensio Pérez, Juan Ignacio
Lack of timely instructors' support when the learners are struggling with the course contents and activities is one frequent problem of MOOC learn-ers. The early identification of these learners could help instructors spend part of their limited time assisting them and avoiding potential dropouts. This paper pre-sents a MOOC case study that explores the behavior of learners who reported problems in private messages and discussion forums. The study aimed at the identification of parameters that might allow the detection of learners struggling with different course aspects. As the results suggested, the comparison of the learners’ activity traces reveals some common sequences that in the future could facilitate the identification of learners facing problems, even without reporting them. On the other hand, statistical analyses on learners’ behavior showed non-significant differences between the learners reporting putting their maximum ef-fort to overcome a problem before asking for help and the ones who did not.
2019-10-22T08:46:32Z
2019-10-22T08:46:32Z
2019-10-22T08:46:32Z
2019
info:eu-repo/semantics/conferenceObject
Scheffel M.; Broisin J.; Pammer-Schindler V.; Ioannou A.; Schneider J. (eds). Fourteenth European Conference on Technology Enhanced Learning (EC-TEL 2019). Lecture Notes in Computer Science, vol. 11722. Springer, Cham. 2019, p. 636-639
978-3-030-29736-7
http://uvadoc.uva.es/handle/10324/38670
10.1007/978-3-030-29736-7_56
eng
https://link.springer.com/chapter/10.1007%2F978-3-030-29736-7_56
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer Nature
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Springer Link
oai:uvadoc.uva.es:10324/386742021-09-09T09:59:35Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
A Data Value Chain to Model the Processing of Multimodal Evidence in Authentic Learning Scenarios
Kant Shankar, Shashi
Ruiz Calleja, Adolfo
Serrano Iglesias, Sergio
Ortega Arranz, Alejandro
Topali, Paraskevi
Martínez Monés, Alejandra
Multimodal Learning Analytics (MMLA) uncovers the possibility to get a more holistic picture of a learning situation than traditional Learning Analytics, by triangulating learning evidence collected from multiple modalities. However, current MMLA solutions are complex and typically tailored to specific learning situations. In order to overcome this problem we are working towards an infrastructure that supports MMLA and can be adapted to different learning situations. As a first step in this direction, this paper analyzes four MMLA scenarios, abstracts their data processing activities and extracts a Data Value Chain to model the processing of multimodal evidence of learning. This helps us to reflect on the requirements needed for an infrastructure to support MMLA.
2019-10-22T09:49:17Z
2019-10-22T09:49:17Z
2019-10-22T09:49:17Z
2019
info:eu-repo/semantics/conferenceObject
Caeiro Rodríguez, M.; Hernández García, A.; Muñoz Merino, P.J. Proceedings of the Learning Analytics Summer Institute (LASI Spain 2019), Vigo, Spain: CEUR, p. 71-83
1613-0073
http://uvadoc.uva.es/handle/10324/38674
eng
http://ceur-ws.org/Vol-2415/
info:eu-repo/grantAgreement/EC/H2020/669074
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
CEUR Workshop Proceedings
oai:uvadoc.uva.es:10324/386762021-06-23T13:30:49Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Synergy: An Online Platform for Dialogic Peer Feedback at Scale
Er, Erkan
Dimitriadis Damoulis, Ioannis
Gašević, Dragan
In this paper, we introduce an online platform called Synergy that is developed to support dialogic peer feedback at scale. The design of Synergy is founded on a theoretical model of dialogic feedback. In this model, dialogic feedback is conceptualized as a collaborative learning activity with three interconnected phases, involving different levels of regulated learning. Grounded in this model, Synergy comprises tools to support learning activities during dialogic feedback. These tools incorporate scripting and learning analytics support to guide learners. By using Synergy as an example, we discuss the importance of informing the design of CSCL tools with theories.
2019-10-22T10:17:14Z
2019-10-22T10:17:14Z
2019-10-22T10:17:14Z
2019
info:eu-repo/semantics/conferenceObject
Lund, K.; Niccolai, G. P.; Lavoué, E.; Gweon, C. H.; Baker, M. (eds.). Proceedings of the 13th International Conference on Computer Supported Collaborative Learning (CSCL 2019), vol. 2. Lyon, France: International Society of the Learning Sciences, 2019, p. 1005-1008
978-1-7324672-4-8
http://uvadoc.uva.es/handle/10324/38676
eng
https://www.cscl2019.com/
info:eu-repo/grantAgreement/EC/H2020/793317
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 International Society of the Learning Sciences
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
International Society of the Learning Sciences (ISLS)
oai:uvadoc.uva.es:10324/386792021-10-19T07:19:07Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Personalizing the connection between formal and informal learning in Smart Learning Environments
Serrano Iglesias, Sergio
Gómez Sánchez, Eduardo
Bote Lorenzo, Miguel Luis
Asensio Pérez, Juan Ignacio
Ruiz Calleja, Adolfo
Vega Gorgojo, Guillermo
Dimitriadis Damoulis, Ioannis
Smart Learning Environments aim at automatically adapting the learning experience based on learner’s context. When this context is not restricted to formal settings, SLEs are a promising solution for au-
tomatically connecting formal education with informal learning opportunities that emerge in different physical and virtual spaces. To achieve this, SLEs can benefit from both the information from the formal learning design as well as the capability of sensing and analyzing the progress of each learner. In previous research, we have devised an architecture to interconnect the different technologies that form an SLE capable of connecting formal and informal learning across-spaces. This paper goes a step forward by exploring the information flow needed to model the current context and state of the learner to eventually trigger informal learning interventions.
2019-10-22T10:44:14Z
2019-10-22T10:44:14Z
2019-10-22T10:44:14Z
2019
info:eu-repo/semantics/conferenceObject
Design, Data, Didactics at the 14th European Conference on Technology Enhanced Learning (EC-TEL 2019), HLS D3. Delft, Holanda, 2019.
http://uvadoc.uva.es/handle/10324/38679
eng
https://www.springer.com/gp/book/9783030297350
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
CEUR Workshop Proceedings
oai:uvadoc.uva.es:10324/386802021-06-23T13:30:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Exploiting the Web of Data to bridge formal and informal learning experiences
Ruiz Calleja, Adolfo
Bote Lorenzo, Miguel Luis
Vega Gorgojo, Guillermo
Serrano Iglesias, Sergio
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
Gómez Sánchez, Eduardo
Proceedings of the 7th
International Conference on Technological Ecosystems for Enhancing Multiculturality, TEEM 2019, León, Spain, October 16-18, 2019.
Smart Education promises personalized learning experiences that bridge formal and informal learning. Our proposal is to exploit the Web of Data to automatically create learning resources that can be, later on, recommended to a learner based on her learning interests and context. For example, a student enrolled in an arts course can get recommendations of learning resources (e.g., a quiz related to a monument she passes by) by exploiting existing geolocalized descriptions of historical buildings in the Web of Data. This paper describes a scenario to illustrate this idea and proposes a software architecture to support it. It also provides some examples of learning resources automatically created with a first prototype of a resource-generator module.
2019-10-22T11:06:44Z
2019-10-22T11:06:44Z
2019-10-22T11:06:44Z
2019
info:eu-repo/semantics/conferenceObject
Proceedings of the 7th International Conference on Technological Ecosystems for Enhancing Multiculturality, TEEM 2019, León, Spain, October 16-18, 2019.
http://uvadoc.uva.es/handle/10324/38680
eng
https://2019.teemconference.eu/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
oai:uvadoc.uva.es:10324/386902021-10-19T07:28:50Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Supporting learning situations connecting formal and informal learning in Smart Learning Environments
Serrano Iglesias, Sergio
The recent advances in technology have increased the proliferation of informal learning experiences in both physical and virtual spaces. In this sense, the connection between formal and informal learning can potentially help students reect and experience in real life settings the learning contents and goals defined by teachers in learning designs. To this end, Smart Learning Environments (SLEs) have been proposed as a promising solution to achieve such connection, considering the learning designs and the students' context to better personalize learning interventions in informal settings. This PhD. thesis addresses the problem of how SLEs can provide automatic and personalized support in informal settings considering students' context across learning spaces, being aligned with the goals defined by teachers. This paper presents a brief motivation, the methodology and the current state of the thesis.
2019-10-23T07:44:26Z
2019-10-23T07:44:26Z
2019-10-23T07:44:26Z
2019
info:eu-repo/semantics/conferenceObject
EC-TEL 2019: 14th European Conference on Technology Enhanced Learning: Doctoral Consortium. CEUR Workshop Proceedings, 2019 (in press)
http://uvadoc.uva.es/handle/10324/38690
eng
http://ceur-ws.org/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Springer
oai:uvadoc.uva.es:10324/390552021-09-13T07:50:01Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
A new software tool for analyzing mental health data in a spanish region
Góngora Alonso, Susel
Mental Health disorders such as schizophrenia, depression, and
dementia have a great impact on society worldwide. Recent developments have
witnessed numerous advances in telemedicine that allow remote monitoring of
elderly people with diseases of this pathology. One of key factors influencing
recent advances in health information systems is the use of data extraction
robust techniques used to extract knowledge from medical databases. The main
objective of the paper is to develop a web application that allows extracting
knowledge from a database of patients with psychiatric disorders and helps
health personnel to know in depth the existing patient profiles and thus improve
decision making. The scenario chosen for this study consists in a government of
Castile and Leon database of 53641 income records of patients with Mental
Health disorders between 2005 and 2015. Applying descriptive statistics for the
analysis of data, the results show different parameters regarding Hospitalization
behavior such as rate, average, hospitalization days of the patient’s number per
hospital and outsourcing services.
2019-11-06T11:26:45Z
2019-11-06T11:26:45Z
2019-11-06T11:26:45Z
2019
info:eu-repo/semantics/conferenceObject
J. Henriques et al. XV Mediterranean Conference on Medical and Biological Engineering and Computing - MEDICON 2019, Coimbra: IFMBE Proceedings 76, 2020, p. 898–906
http://uvadoc.uva.es/handle/10324/39055
10.1007/978-3-030-31635-8_109
spa
info:eu-repo/semantics/openAccess
Springer
oai:uvadoc.uva.es:10324/424402021-10-19T07:10:57Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Design of conversational agents for CSCL: comparing two types of agent intervention strategies in a university classroom
Michos, Konstantinos
Asensio Pérez, Juan Ignacio
Dimitriadis Damoulis, Ioannis
García Sastre, Sara
Villagrá Sobrino, Sara Lorena
Ortega Arranz, Alejandro
Gómez Sánchez, Eduardo
Topali, Paraskevi
The use of Conversational Agents (CAs) in computer-supported collaborative learning (CSCL) has shown promising results regarding students' productive dialogue and learning. Yet, limited work has explored the connection between the configuration of the CA behavior, the nature of the learning task, and the student behavior in authentic educational settings. In this work, we describe a pedagogical design space of CAs for collaborative learning composed of three dimensions: task design, domain model, and agent intervention strategies. We conduct an initial field study in a university classroom comparing two types of agent intervention strategies based on student participation, dialogue, and satisfaction. 54 university students worked in pairs in the same collaborative brainstorming task with a CA tool and were randomly assigned in two CA conditions with a) knowledge-based prompts to connect two domain concepts, b) social prompts to link their partners' contributions. The results show that students who received knowledge-based prompts significantly exchanged more messages with evidence of explicit reasoning and were more satisfied with the agent and their discussion during the task. Students from both conditions reported problems like the lack of context-awareness and timely interventions by the agent. We discuss the relation between the agent intervention strategies and the task design towards seeking design recommendations for CAs in CSCL.
2020-09-22T11:58:08Z
2020-09-22T11:58:08Z
2020-09-22T11:58:08Z
2020
info:eu-repo/semantics/conferenceObject
http://uvadoc.uva.es/handle/10324/42440
https://doi.org/10.1007/978-3-030-57717-9_16
eng
https://link.springer.com/chapter/10.1007/978-3-030-57717-9_16
info:eu-repo/semantics/openAccess
© 2020 Springer Nature
Springer
oai:uvadoc.uva.es:10324/528422022-05-27T12:39:21Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Design of VNF-Mapping with node protection in WDM metro networks
Ruiz Pérez, Lidia
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Merayo Álvarez, Noemí
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
Network Function Virtualization (NFV) is considered to be one of the enabling technologies for 5G. NFV poses several challenges, like deciding the virtual network function (VNF) placement and chaining, and adding backup resources to guarantee the survivability of service chains. In this paper, we propose a genetic algorithm that jointly solves the VNF-placement, chaining and virtual topology design problem in WDM metro ring network, with the additional capacity of providing node protection. The simulation results show how important is to solve all of these subproblems jointly, as well as the benefits of using shared VNF and network resources between backup instances in order to reduce both the service blocking ratio and the number of active CPUs.
2022-04-20T08:33:49Z
2022-04-20T08:33:49Z
2022-04-20T08:33:49Z
2019
info:eu-repo/semantics/conferenceObject
Li, Qingshan; Song, Shengli; Li, Rui; Xu, Yueshen; Xi, Wei; Gao, Honghao. International Conference on Broadband Communications, Networks and Systems. Xi’an, China: Springer, 2019, p. 285–298
978-3-030-36442-7
https://uvadoc.uva.es/handle/10324/52842
10.1007/978-3-030-36442-7_19
eng
https://link.springer.com/chapter/10.1007/978-3-030-36442-7_19
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Springer
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Springer Link
oai:uvadoc.uva.es:10324/528742022-08-26T08:49:21Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Multi-access edge computing: características y aplicación en entornos rurales de baja densidad de población
Anzola Rojas, Camilo
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Parra Domínguez, Javier
Chaves, André
Con la aparición de tecnologías disruptivas como Internet de las Cosas (IoT), Industria 4.0 o Realidad Virtual (VR), entre otras, cada vez hay más servicios y dispositivos con diferentes características que se interconectan mediante redes de comunicaciones y necesitan capacidades de computación y almacenamiento con las que, en principio, no cuentan. Para superar este problema se propuso la solución de computación en la nube (cloud computing), que consiste básicamente en confiar las tareas más pesadas a un servidor central con alta potencia computacional. A primera vista este enfoque resuelve el problema, pero, como generalmente estos servidores centrales (data centers) se encuentran lejos de los dispositivos finales, aparecen nuevos problemas, especialmente con respecto al aumento de la latencia. La siguiente propuesta es el MEC (Multi-access Edge Computing, o computación de acceso múltiple en el borde), que es similar a la computación en la nube, pero se basa en servidores más cercanos a los usuarios, esto es, "en el borde" de la red de acceso, en lugar de servidores lejanos "en la nube". Este artículo ofrece una revisión de las principales características, de MEC, haciendo énfasis en su aplicación en escenarios como muchas regiones hispano-portuguesas, con baja densidad de población, grandes distancias entre ciudades o pueblos, y con un importante porcentaje de entornos rurales.
2022-04-21T07:10:18Z
2022-04-21T07:10:18Z
2022-04-21T07:10:18Z
2021
info:eu-repo/semantics/conferenceObject
Parra Domínguez, Javier; Rodríguez González, Sara; Prieto Tejedor, Javier; Corchado Rodríguez, Juan Manuel. III Workshop on disruptive information and communication technologies for innovation and digital transformation. Ediciones Universidad de Salamanca, 2021, p. 59-75
978-84-1311-579-5
https://uvadoc.uva.es/handle/10324/52874
10.14201/0AQ03115975
spa
https://eusal.es/eusal/catalog/view/978-84-1311-579-5/6007/7624-1
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Ediciones Universidad de Salamanca
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Ediciones Universidad de Salamanca
oai:uvadoc.uva.es:10324/528792022-08-24T09:08:01Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Propuesta de política público-privada para el despliegue de la banda ancha en entornos rurales de Castilla y León
Durán Barroso, Ramón José
Anzola Rojas, Camilo
Merayo Álvarez, Noemí
Miguel Jiménez, Ignacio de
Aguado Manzano, Juan Carlos
Pérez Pons, María Eugenia
Parra Domínguez, Javier
Plaza Hernández, María
Los nuevos servicios y aplicaciones disruptivas requieren la utilización de redes de comunicaciones de banda ancha. En el segmento de acceso, las redes de acceso ópticas pasivas (PON) se están consolidando como la mejor alternativa para este despliegue dado que las tecnologías de acceso tradicionales (cable coaxial, cobre) ya han dejado de ser capaces de soportar el creciente volumen de tráfico. Sin embargo, el despliegue actual de estas redes PON es muy desigual estando únicamente presentes en las áreas de mayor densidad de población donde el coste por conexión para los operadores se mantiene bajo. En este artículo presentamos una propuesta de política público-privada que permitirá incentivar a los operadores para el despliegue de redes PON en entornos de baja densidad de población (entornos rurales). Para demostrar su eficacia, se presenta un caso de uso en la provincia de Valladolid (Castilla y León, España). Los resultados de este estudio muestran que, gracias a la utilización de la política propuesta, los operadores pueden encontrar atractivo dar un servicio a todos los usuarios y poblaciones que lo deseen.
2022-04-21T08:51:35Z
2022-04-21T08:51:35Z
2022-04-21T08:51:35Z
2021
info:eu-repo/semantics/conferenceObject
Ramos, Carlos; Marreiros, Goreti; Parra, Javier. IV Workshop on Disruptive Information and Communication Technologies for Innovation and Digital Transformation. Ediciones Universidad de Salamanca, 2021
978-84-1311-582-5
https://uvadoc.uva.es/handle/10324/52879
10.14201/0AQ0315117130
spa
https://eusal.es/eusal/catalog/view/978-84-1311-582-5/6013/7697-1
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 Ediciones Universidad de Salamanca
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Ediciones Universidad de Salamanca
oai:uvadoc.uva.es:10324/528922022-04-26T08:06:46Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Comparison of different protection schemes in the design of VNF-mapping with VNF resiliency
Ruiz Pérez, Lidia
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
Network Function Virtualization (NFV) is a promising networking paradigm that will ease the network manageability and increase its flexibility, while reducing costs. In this paradigm, operators must solve the Virtual Network Function (VNF) placement and chaining problems. It is also important to provide backup resources to ensure the survivability of the offered services when a node failure happens. In this paper, we compare two different protection approaches to ensure the service resilience: individual VNF protection and end-to-end protection. Results show the benefits in terms of use of computing resources and energy consumption of protecting each VNF individually, compared to the end-to-end protection approach.
2022-04-21T11:49:29Z
2022-04-21T11:49:29Z
2022-04-21T11:49:29Z
2020
info:eu-repo/semantics/conferenceObject
2020 22nd International Conference on Transparent Optical Networks (ICTON). Bari, Italia: IEE Xplore, 2020, 4 p.
978-1-7281-8423-4
https://uvadoc.uva.es/handle/10324/52892
10.1109/ICTON51198.2020.9203066
eng
https://ieeexplore.ieee.org/document/9203066
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 IEEE Xplore
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
IEEE Xplore
oai:uvadoc.uva.es:10324/529022022-04-24T18:33:25Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Joint Planning of MEC and Fiber Deployment in Sparsely Populated Areas
Anzola Rojas, Camilo
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
The planning of multi-access edge computing (MEC) systems does not only consist in distributing MEC servers among the base stations (BSs) but also in designing the network to interconnect BSs, MEC resources and the wide area network (WAN) gateway. Due to their high bandwidth, fiber links are the best option for those connections in 5G environments. In contrast to previous works, which only solve the server placement problem, in this paper, an integer linear programming (ILP) formulation is proposed for solving both problems while reducing the installation cost (servers and fibers). The fiber deployment cost is especially important in sparsely populated areas as the distance between BSs are much longer than in urban environments. The model was tested using real BSs locations and population data showing that the formulation considerably reduces the installation cost.
2022-04-22T10:22:55Z
2022-04-22T10:22:55Z
2022-04-22T10:22:55Z
2021
info:eu-repo/semantics/conferenceObject
2021 International Conference on Optical Network Design and Modeling (ONDM). Gothenburg, Suecia: IEEE, 2021, 3 p.
978-3-9031-7633-1
https://uvadoc.uva.es/handle/10324/52902
10.23919/ONDM51796.2021.9492396
eng
https://ieeexplore.ieee.org/document/9492396
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2021 IEEE
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
IEEE
oai:uvadoc.uva.es:10324/529052022-04-24T18:33:28Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Joint VNF-Provisioning and Virtual Topology Design in 5G Optical Metro Networks
Ruiz Pérez, Lidia
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Merayo Álvarez, Noemí
Aguado Manzano, Juan Carlos
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
5G technology will provide networks with high-bandwidth, low latency and multitenancy. The integration of computing and storage resources in the edge of the fronthaul network, i.e., multi-access edge computing (MEC), will allow to instantiate some virtual network functions (VNF) in those computing resources. The backhaul of 5G networks will be based on optical technology, in particular WDM, due to its high capacity and flexibility. In this paper, we analyse the problem of VNF-provisioning in a metro ring-topology network equipped with MEC resources and with a WDM network connecting the edge nodes. In contrast to previous proposals, the method decides where VNFs must be instantiated but also the design of the virtual topology for the WDM metro network in order to reduce the service blocking ratio and the number of resources in operation.
2022-04-22T11:56:53Z
2022-04-22T11:56:53Z
2022-04-22T11:56:53Z
2019
info:eu-repo/semantics/conferenceObject
2019 21st International Conference on Transparent Optical Networks (ICTON). Angers, Francia: IEEE, 2019. 4 p.
978-1-7281-2779-8
https://uvadoc.uva.es/handle/10324/52905
10.1109/ICTON.2019.8840523
eng
https://ieeexplore.ieee.org/document/8840523
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 IEEE
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
IEEE
oai:uvadoc.uva.es:10324/529102022-04-25T20:46:52Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Implementation of an automated control module in Python for a SDN GPON testbed
Merayo Álvarez, Noemí
Pintos, David de
Azofra Ovejero, Javier Néstor
Aguado Manzano, Juan Carlos
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Ruiz Pérez, Lidia
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
Passive Optical Networks (PONs) are the most deployed network infrastructure in the access segment. Indeed, the number of Fibre-to-the-Home (FTTH) subscribers in Europe increased with more than 59.6 million in September 2018. On the other hand, the automation of the PON configuration to lead to better control of the network management may provide many advantages to exploit the PON capabilities, for example to facilitate the integration of Software Defined Networking (SDN) strategies in this networks. Indeed, SDN may improve the network efficiency of networks regarding scalability, management and Quality of Service (QoS) performance. Therefore, we propose a network automation system in Python to control and configure a SDN-GPON solution implemented over a real GPON testbed.
2022-04-25T07:11:04Z
2022-04-25T07:11:04Z
2022-04-25T07:11:04Z
2019
info:eu-repo/semantics/conferenceObject
11ª Reunión Española de Optoelectrónica, OPTOEL’19. Zaragoza: Universidad de Zaragoza, 2019
https://uvadoc.uva.es/handle/10324/52910
eng
http://optoel2019.unizar.es/23820/detail/optoel-2019.html
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Universidad de Zaragoza
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Universidad de Zaragoza
oai:uvadoc.uva.es:10324/602362023-07-11T19:00:47Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
¿Qué diferencia hay entre los distintos tipos de equipo de Microsoft Teams?
Miguel Jiménez, Ignacio de
Durán Barroso, Ramón José
Aguado Manzano, Juan Carlos
Merayo Álvarez, Noemí
Abril Domingo, Evaristo José
Lorenzo Toledo, Rubén Mateo
Fernández Reguero, Patricia
Bahillo Martínez, Alfonso
Rosa Steinz, Ramón de la
Blas Prieto, Juan
Alonso Alonso, Alonso
Póster presentando las características de los diferentes tipos de equipo de Microsoft Teams.
2023-07-11T18:03:53Z
2023-07-11T18:03:53Z
2023-07-11T18:03:53Z
2023
info:eu-repo/semantics/conferenceObject
VII Jornada de Innovación Docente de la Universidad de Valladolid, Valladolid: Universidad de Valladolid, 2023
https://uvadoc.uva.es/handle/10324/60236
spa
info:eu-repo/semantics/openAccess
oai:uvadoc.uva.es:10324/623102023-10-25T19:01:30Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Performance Evaluation of TI-LFA in Traffic-Engineered Segment Routing-Based Networks
Roelens, L.
González de Dios, Óscar
Miguel Jiménez, Ignacio de
Echeverry, E.
Durán Barroso, Ramón José
Link failures have a significant negative impact on the availability of a network and should therefore be resolved as soon as possible. Because of the slow convergence time of routing protocols upon detection of a link failure, several IP Fast ReRoute (FRR) mechanisms have been developed to overcome this problem. Recently, segment routing, which is a flexible and scalable way of doing source routing, enabled a new FRR mechanism called Topology Independent Loop-Free Alternate (TI-LFA). As the name suggests, the key feature of TI-LFA is that it guarantees a loop-free detour against any link failure in any network topology. However, typically fast responses to failures only aim to restore the loop-free connection between the affected routers and do not consider the resulting delay or impact on network congestion. This paper presents an initial study on the selected TI-LFA backup paths and their effect on the overall network performance. By means of simulation, we evaluate how efficient TI-LFA reroutes traffic for a number of traffic engineering approaches. Our results quantify the impact of different traffic engineering approaches and network loads on the performance of TI-LFA. This suggests potential directions for improving the effectiveness of TI-LFA protection in segment routing.
2023-10-25T10:48:19Z
2023-10-25T10:48:19Z
2023-10-25T10:48:19Z
2023
info:eu-repo/semantics/conferenceObject
2023 19th International Conference on the Design of Reliable Communication Networks (DRCN), Vilanova i la Geltru, Spain, 2023, pp. 1-8
https://uvadoc.uva.es/handle/10324/62310
10.1109/DRCN57075.2023.1010828
eng
https://ieeexplore.ieee.org/document/10108280
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Institute of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/622972023-10-27T09:39:51Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
Enabling Road Side Units with Optical Access Networks: Planning and Techno-Economic Analysis
Anzola Rojas, Camilo
Durán Barroso, Ramón José
Miguel Jiménez, Ignacio de
Aguado Manzano, Juan Carlos
Merayo Álvarez, Noemí
Fernández Reguero, Patricia
Lorenzo Toledo, Rubén Mateo
Abril Domingo, Evaristo José
The upcoming Connected and cooperative and automated mobility paradigm (CCAM) requires the deployment of road-side units (RSUs) beside the roads to provide wireless communication to connected-vehicle on board units. The deployment of RSUs along the highways provide low-latency communication, suitable for applications where high-speed response is needed, such as autonomous driving and crash avoidance. These RSUs must be connected to the Internet through a high-bandwidth and reliable access network being the optical fiber technologies the most convenient technology for that. In this paper, we propose a planning scheme for enabling RSUs with optical access networks. The method starts choosing the locations of the access network headers (the connection points to the local service provider facilities), and then defines the connections between the headers and the RSUs in a convenient manner considering the road infrastructure. Then, two deployment technologies based on optical fibers are compared: Point to Point (P2P) and Passive Optical Network (PON). A techno-economic analysis was performed, and results show that P2P and PON approaches are very similar in terms of cost, therefore, due to technical advantages, P2P is recommended as deployment strategy for the described scenario.
2023-10-25T07:57:21Z
2023-10-25T07:57:21Z
2023-10-25T07:57:21Z
2022
info:eu-repo/semantics/conferenceObject
32nd International Telecommunication Networks and Applications Conference (ITNAC), Wellington, New Zealand, 2022, pp. 192-198
9781665471039 (online)
https://uvadoc.uva.es/handle/10324/62297
10.1109/ITNAC55475.2022.9998406
eng
https://ieeexplore.ieee.org/document/9998406
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Institution of Electrical and Electronics Engineers (IEEE)
oai:uvadoc.uva.es:10324/622992023-10-25T19:01:28Zcom_10324_1191com_10324_931com_10324_894col_10324_1381
5G Radio Resource Allocation for Communication and Computation Offloading
Stan, Catalina
Rommel, Simon
Miguel Jiménez, Ignacio de
Vegas Olmos, Juan José
Durán Barroso, Ramón José
Tafur Monroy, Idelfonso
Edge computing is envisioned as a key enabler in future cellular networks by bringing the computing, networking and storage resources closer to the end users and enabling offloading for computation-intensive or latency-critical tasks coming from the emerging 5G/6G applications. Such technology also introduces additional challenges when it comes to deciding when to offload or not since the dynamic wireless environment plays a significant role in the overall communication and computation costs when offloading workload to the nearby edge nodes. In this paper, we focus on the communication cost in computation offloading via wireless channels, by formulating an α -fair utility-based radio resource allocation (RRA) problem tailored for offloading in a multi-user urban scenario where the uplink connection is the main focus. We begin by modeling the wireless channel with large- and small-scale fading at both lower and millimetre-wave frequencies, followed by data rate calculation based on 3GPP for a more realistic approach. Then, while assessing the fairness of the RRA, we simulate the resource allocation framework while taking into account both users who need to offload and users who are only interested in high downlink data rates. Simulation results show that the weighted proportional fairness method adapted for computation offloading can provide a good trade-off between fairness and performance compared to other benchmark schemes.
2023-10-25T08:18:45Z
2023-10-25T08:18:45Z
2023-10-25T08:18:45Z
2023
info:eu-repo/semantics/conferenceObject
2023 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit), Gothenburg, Sweden, 2023, pp. 1-6
https://uvadoc.uva.es/handle/10324/62299
10.1109/EuCNC/6GSummit58263.2023.10188281
eng
https://ieeexplore.ieee.org/document/10188281
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Institute of Electrical and Electronics Engineers (IEEE)
qdc///col_10324_1381/100