Evaluación de mapas conceptuales en asignaturas de informática utilizando métricas objetivas

Los Mapas Conceptuales han sido utilizados desde hace bastante tiempo y sus principios han dado lugar a diferentes teorías de aprendizaje. Cuando éstos son utilizados como una herramienta para evaluar el aprendizaje, su utilización reporta importante beneficios, debido a que permiten que el alumno exprese de una forma natural su árbol mental de conceptos asimilados. Sin embargo, el proceso de evaluación de los mismos conlleva un importante grado de subjetividad, el cual debería ser reducido para promover su utilización. En este trabajo, proponemos separar el proceso de evaluación de mapas conceptuales, siguiendo los mismos pasos utilizados para la creación de los mismos, utilizando además métricas objetivas para dar una puntuación a cada uno de los pasos utilizados en su elaboración. Se propone una fórmula que combina las puntuaciones intermedias para obtener la puntuación final del mapa conceptual. La técnica de evaluación propuesta ha sido validada utilizando diferentes mapas conceptuales de estudiantes que han sido evaluados utilizando o no la técnica aquí propuesta. Los resultados muestran que la técnica propuesta permite reducir la alta variabilidad de las evaluaciones realizadas por diferentes instructores, permitiendo además reducir considerablemente el esfuerzo necesario en el proceso de evaluación.Peer Reviewe

On the Benefits of a Cooperative Layer-2 based Routing Approach for Hybrid Wireless Mesh Networks

In a wireless mesh network, the convenience of a routing strategy strongly depends on the mobility of the intermediate nodes that compose the paths. Taking into account this behavior, this paper presents a routing scheme that works differently accordingly to the nodes mobility. In this sense, a proactive routing scheme is restricted to the backbone in order to promote the use of stable routes. On the other hand, the reactive protocol is used to search routes to or from a mobile destination. Both approaches are simultaneously implemented in the mesh nodes so that the routing protocols share routing information that optimize the network performance. Aiming at guaranteeing the IP compatibility, the combination of the two protocols in the core routers is carried out at the Medium Access Control (MAC) layer. Opposite to the operation at IP layer where two routing protocols are not able to concurrently work, the transfer of the routing tasks to the MAC layer enables the use of multiple independent forwarding tables. Simulation results show the goodness of the proposal in terms of packet losses and data delayTriviño, A.; Ariza, A.; Casilari, E.; Cano Escribá, JC. (2013). On the Benefits of a Cooperative Layer-2 based Routing Approach for Hybrid Wireless Mesh Networks. China Communications. 10(8):88-99. doi:10.1109/CC.2013.6633748S889910

Tinta digital aplicada a la enseñanza universitaria de la Informática: menos lecciones y más actividades

Este trabajo resume los resultados iniciales de un proyecto de innovación que utiliza Tablet-PCs conectados en red como elementos clave para desarrollar un entorno de enseñanza-aprendizaje interactivo. Los objetivos del mismo son reducir tanto las tasas de absentismo como las de abandono (actualmente superior al 50%) y, sobre todo, facilitar el aprendizaje y mejorar el rendimiento académico. El proyecto ha sido aplicado durante el segundo cuatrimestre del curso 08-09 a un grupo piloto de 20 alumnos de Ampliación de Tecnología de Computadores, asignatura obligatoria de primer curso de Ingeniería Técnica de Informática de Sistemas, en la Universidad Politécnica de Valencia. Los resultados preliminares en este grupo muestran que la tasa de abandono se ha reducido más de un 50%, mientras que el número de aprobados, en la convocatoria de junio, se ha doblado con respecto al valor medio del resto de grupos. Por otro lado, un análisis cualitativo de la experiencia ha proporcionado una muy buena percepción tanto por parte de los alumnos como del personal participante en la misma.Peer Reviewe

In-Red 2022. VIII Congreso nacional de innovación educativa y docencia en red

Organizado conjuntamente por el Vicerrectorado de Planificación, Oferta Académica y Transformación Digital y el Vicerrectorado de Profesorado y Ordenación Académica, la Universitat Politècnica de València convoca el Congreso de Innovación Educativa y Docencia en Red IN-RED 2022 (#INRED2022), que tendrá lugar en la ciudad de VALENCIA los días 6, 7 y 8 de julio de 2022. El confinamiento que hemos vivido como consecuencia de la pandemia COVID-19,nos ha permitido APRENDER distintas LECCIONES que es el momento de COMPARTIR. Así, bajo el lema "Lecciones aprendidas: ideas compartidas", volvemos con más fuerza para poner en común las adaptaciones realizadas y construir un rico bagaje de las dinámicas, recursos, evaluaciones, métodos... empleados que nos permita seguir avanzando en la mejora de la educación superiorGarcía Sabater, JP.; Cano Escribá, JC. (2022). In-Red 2022. VIII Congreso nacional de innovación educativa y docencia en red. Editorial Universitat Politècnica de València. https://doi.org/10.4995/INRED2022.2022.1597

Highlights: IEEE ITS Society Technical Committee on Mobile Communications Networks for ITS

[EN] The TC on 'Mobile Networks for ITS' has been in existence since 2005. It will continue to initiate activities (through journal and magazine special issues, workshops, conferences, forums, etc.,) and to promote the technical interactions among professionals in the field. The success of the TC will depend on the contributions of its members and organizers. We would like to thank Prof. Urbano Nunes (VP Technical Activities) for inviting us to submit this highlight. We would also like to thank all the TC members who have supported us over the years. We look forward to your continual participation in the future.This work was partially supported by the Ministerio de Ciencia e Innovación, Spain, under Grant TIN2011-27543-C03-01.Toh, CK.; Higashino, T.; Cano Escribá, JC.; Weigle, MC. (2012). Highlights: IEEE ITS Society Technical Committee on Mobile Communications Networks for ITS. IEEE Intelligent Transportation Systems Magazine. 4(1):33-37. doi:10.1109/MITS.2011.2178875S33374

Foreword by guest editors for the Special Issue on the 2013 ICUFN Conferencs

Jeong, S.; Rodrigues, JJPC.; Cano Escribá, JC. (2014). Foreword by guest editors for the Special Issue on the 2013 ICUFN Conferencs. Wireless Personal Communications. 78(4):1827-1831. doi:10.1007/s11277-014-2046-yS1827183178

Epidgeons: Combining Drones and DTNs Technologies to Provide Connectivity in Remote Areas

© Owner/Author. 2015 This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in ACM, In Proceedings of the First Workshop on Micro Aerial Vehicle Networks, Systems, and Applications for Civilian Use (pp. 57-58). http://dx.doi.org/10.1145/2750675.2750688.In certain geographical areas such as the rural areas or the developing regions, the lack of infrastructure, the temporary nature of the connections and the limited access to fixed public networks does not allow the use of all the advantages offered by the Internet. In this paper we present our project that aims to test a new communication system based on the combination of the use of unmanned aerial vehicles (called ePidgeons) and wireless networking technologies for Disruption Tolerant Networks (DTN). As a study case we will use the riparian communities along the rivers in the Amazon region.Manzoni, P.; Tavares De Araujo Cesariny Calafate, CM.; Cano Escribá, JC.; Mota, E. (2015). Epidgeons: Combining Drones and DTNs Technologies to Provide Connectivity in Remote Areas. ACM Digital Library. doi:10.1145/2750675.2750688SJ. Crowcroft, E. Yoneki, P. Hui, and T. Henderson, "Promoting tolerance for delay tolerant network research", ACM SIGCOMM Computer Communication Review, vol. 38, no. 5, Oct. 2008, pp. 63--68.Project "Networking for Communications Challenged Communities: Architecture, Test Beds and Innovative Alliances" (N4C), http://www.n4c.eu/.Project "DakNet", http://www.unitedvillages.com/.Phuong Tran Thi Ha, H. Yamamoto, K. Yamazaki, "Using Autonomous Air Vehicle in DTN Sensor Network for Environmental Observation", IEEE 37th Annual Computer Software and Applications Conference (COMPSAC) 2013, pp. 447--450.Uchida, N.; Kawamura, N.; Ishida, T.; Shibata, Y., "Proposal of Autonomous Flight Wireless Nodes with Delay Tolerant Networks for Disaster Use," 2014 Eighth International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS), 2-4 July 2014M. Coutinho, T. Moreira, E. Silva, A. Efrat, and T. Johnson. A new proposal of data mule network focused on Amazon riverine population. In Proceedings of the 3rd Extreme Conference on Communication: The Amazon Expedition (ExtremeCom '11). ACM, New York, NY, USAHervé Ntareme, Marco Zennaro, and Björn Pehrson. Delay tolerant network on smartphones: applications for communication challenged areas. In Proceedings of the 3rd Extreme Conference on Communication: The Amazon Expedition (ExtremeCom '11). ACM, New York, NY, USAMartinez-Vidal, Ruben, et al. "Mobile-agent based delay-tolerant network architecture for non-critical aeronautical data communications." Distributed Computing and Artificial Intelligence. Springer International Publishing, 2013. 513--520

Congestion Control for Vehicular Environments by Adjusting IEEE 802.11 Contention Window Size

The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-03889-6_30Medium access control protocols should manage the highly dynamic nature of Vehicular Ad Hoc Networks (VANETs) and the variety of application requirements. Therefore, achieving a well-designed MAC protocol in VANETs is a challenging issue. The contention window is a critical element for handling medium access collisions in IEEE 802.11, and it highly affects the communications performance. This paper proposes a new contention window control scheme, called DBM-ACW, for VANET environments. Analysis and simulation results using OMNeT++ in urban scenarios show that DBM-ACW provides better overall performance compared with previous proposals, even with high network densities.This work was partially supported by the Ministerio de Ciencia e Innovación, Spain, under Grant TIN2011-27543-C03-01Balador, A.; Tavares De Araujo Cesariny Calafate, CM.; Cano Escribá, JC.; Manzoni, P. (2013). Congestion Control for Vehicular Environments by Adjusting IEEE 802.11 Contention Window Size. En Algorithms and Architectures for Parallel Processing. Springer. 259-266. https://doi.org/10.1007/978-3-319-03889-6_30S259266Booysen, M.J., Zeadally, S., van Rooyen, G.-J.: Survey of media access control protocols for vehicular ad hoc networks. IET Communications 5(11), 1619–1631 (2011)Kenney, J.: Standards and regulations. In: Hartenstein, H., Laberteaux, K.P. (eds.) VANET: Vehicular Applications and Inter-networking Technologies, ch. 10, pp. 365–428. Wiley (2010)Stanica, R., Chaput, E., Beylot, A.-L.: Enhancements of IEEE 802.11p Protocol for Access Control on a VANET Control Channel. In: 2011 IEEE International Conference on Communications (ICC), June 5-9, pp. 1–5 (2011)Calafate, C.T., Fortino, G., Fritsch, S., Monteiro, J., Cano, J., Manzoni, P.: An efficient and robust content delivery solution for IEEE 802.11p vehicular environments. Journal of Network and Computer Applications 35(2), 753–762 (2012)Cali, F., Conti, M., Gregori, E.: Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit. IEEE/ACM Transactions on Networking 8(6), 785–799 (2000)Wu, H., Cheng, S., Peng, Y., Long, K., Ma, J.: IEEE 802.11 distributed coordination function (DCF): analysis and enhancement. In: IEEE International Conference on Communications, ICC 2002, vol. 1, pp. 605–609 (2002)Balador, A., Movaghar, A., Jabbehdari, S.: History based contention window control in ieee 802.11 mac protocol in error prone channel. Journal of Computer Science 6(2), 205–209 (2010)Chrysostomou, C., Djouvas, C., Lambrinos, L.: Applying adaptive QoS-aware medium access control in priority-based vehicular ad hoc networks. In: 2011 IEEE Symposium on Computers and Communications (ISCC), June 28-July 1, pp. 741–747 (2011)Jang, H.-C., Feng, W.-C.: Network Status Detection-Based Dynamic Adaptation of Contention Window in IEEE 802.11p. In: 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), May 16-19, pp. 1–5 (2010)http://www.omnetpp.org/http://inet.omnetpp.org/Behrisch, M., Bieker, L., Erdmann, J., Krajzewicz, D.: SUMO - Simulation of Urban MObility: An Overview. In: The Third International Conference on Advances in System Simulation, SIMUL 2011 (2011)Baguena, M., Tornell, S., Torres, A., Calafate, C.T., Cano, J.C., Manzoni, P.: VACaMobil: VANET Car Mobility Manager for OMNeT++. In: IEEE International Conference on Communications 2013 - 3rd IEEE International Workshop on Smart Communication Protocols and Algorithms (SCPA 2013), Budapest, Hungary (June 2013)Baguena, M., Calafate, C.T., Cano, J., Manzoni, P.: Towards realistic vehicular network simulation models. In: 2012 IFIP Wireless Days (WD), November 21-23, pp. 1–3 (2012)http://www.openstreetmap.org

An ITS solution providing real-time visual overtaking assistance using smartphones

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.ITS solutions suffer from the slow pace of adoption by manufacturers despite the interest shown by both consumers and industry. Our goal is to develop ITS applications using already available technologies to make them affordable, quick to deploy, and easy to adopt. In this paper we introduce an ITS system for overtaking assistance that provides drivers with a real-time video feed from the vehicle located just in front. This provides a better view of the road ahead, and of any vehicles travelling in the opposite direction, being especially useful when the front view of the driver is blocked by large vehicles. We evaluated our application using H.264 and MJPEG video encoding formats, and determined the most effective codec choice for our case. Experimental results allow us to be optimistic about the effectiveness and applicability of smartphones in providing overtaking assistance based on video streaming in vehicular networks.This work was partially supported by the European Commission under Svagata.eu, the Erasmus Mundus Programme, Action 2 (EMA2) and the Ministerio de Economía y Competitividad, Programa Estatal de Investigación, Desarrollo e Innovación Orientada a los Retos de la Sociedad, Proyectos I+D+I 2014, Spain, under Grant TEC2014-52690-R.Patra, S.; Tavares De Araujo Cesariny Calafate, CM.; Cano Escribá, JC.; Manzoni, P. (2015). An ITS solution providing real-time visual overtaking assistance using smartphones. IEEE. https://doi.org/10.1109/LCN.2015.7366320

A Representative and Accurate Characterization of Inter-contact Times in Mobile Opportunistic Networks

© ACM 2013. This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in MSWiM '13 Proceedings of the 16th ACM international conference on Modeling, analysis & simulation of wireless and mobile systems; http://dx.doi.org/10.1145/2507924.2507936.A representative characterisation of inter-contact times between nodes is essential for the performance evaluation of mobile networks. The most common characterization of inter-contact times is based on the study of the aggregate distribution of contacts between individual pairs of nodes. The problem with this aggregate distribution is that it is not always representative of the individual pair distributions, especially in the short term and when the number of nodes in the network is high. Thus, deriving results from this characterisation, can lead to inaccurate performance evaluations results. In this paper, we propose and evaluate two new methods for characterising the inter-contact times distribution in mobile networks. We prove that these characterizations have a higher representativeness, thereby improving the accuracy of the derived performance results. For evaluating the precision of the different characterizations we use the epidemic routing protocol, which has an analytical performance expression that is based on a contact rate λ. We derive from each of the characterizations the corresponding λ values. Then, we compare the results obtained using the analytical expression with simulation results using both synthetic and real contact traces. It is shown that the new characterization methods are very accurate, even for reduced contact traces and high number of nodes.This work was partially supported by the Ministerio de Ciencia e Innovación, Spain, under Grant TIN2011-27543-C03-01.Hernández Orallo, E.; Cano Escribá, JC.; Tavares De Araujo Cesariny Calafate, CM.; Manzoni, P. (2013). A Representative and Accurate Characterization of Inter-contact Times in Mobile Opportunistic Networks. ACM. https://doi.org/10.1145/2507924.2507936