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  • Energy-aware topology control strategy for human-centric wireless sensor networks

     Meseguer Pallares, Roque; Molina, Carlos; Ochoa, Sergio; Santos, Rodrigo
    Sensors
    Date of publication: 2014-02-07
    Journal article

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    The adoption of mobile and ubiquitous solutions that involve participatory or opportunistic sensing increases every day. This situation has highlighted the relevance of optimizing the energy consumption of these solutions, because their operation depends on the devices¿ battery lifetimes. This article presents a study that intends to understand how the prediction of topology control messages in human-centric wireless sensor networks can be used to help reduce the energy consumption of the participating devices. In order to do that, five research questions have been defined and a study based on simulations was conducted to answer these questions. The obtained results help identify suitable mobile computing scenarios where the prediction of topology control messages can be used to save energy of the network nodes. These results also allow estimating the percentage of energy saving that can be expected, according to the features of the work scenario and the participants behavior. Designers of mobile collaborative applications that involve participatory or opportunistic sensing, can take advantage of these findings to increase the autonomy of their solutions.

  • Geo-localized messages irradiation using smartphones: An energy consumption analysis

     Moreno, Daniel; Ochoa, Sergio; Santos, Rodrigo; Meseguer Pallares, Roque
    International Conference on Computer Supported Cooperative Work in Design
    Presentation's date: 2013-06-27
    Presentation of work at congresses

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    The widespread availability of smartphones with wireless communication and geo-positioning capabilities has open new opportunities to services for casual passersby, e.g. the delivery of advertising when they visit a certain area. Typically such messages are delivered to cellular phones, consuming thus part of the energy of these devices. Since these devices are constrained in battery-energy, disseminating messages using little energy represents a challenge for designers of this type of solutions. This paper presents a study based on simulations that intends to identify good strategies to irradiate messages collaboratively, minimizing the energy consumption in the devices involved in the information exchange. The simulation results show that the best irradiation strategy will depend on the number of devices in the area to be irradiated. Moreover, such a strategy will have more influence if the devices are dispersed. These findings should help designers of mobile collaborative applications based on messages irradiation, to identify the best dissemination strategy depending on the current network context.

  • Effort-based incentives for resource sharing in collaborative volunteer applications

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix; Ochoa, Sergio
    International Conference on Computer Supported Cooperative Work in Design
    Presentation's date: 2013-06-27
    Presentation of work at congresses

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    Collaborative and volunteer applications need to implement incentive mechanisms to regulate resource sharing and encourage network nodes to contribute for reaching a certain goal. Typically, these incentive mechanisms assign resources to network node requests, based on the total amount of resources contributed by the requesting participant. This approach assumes that participants contributing more should also get back more resources from the collaborative environment. This assumption turns the system unfair to those participants with scarce resources, because they have just few resources to share. This paper proposes the use of an incentive strategy based on the contribution percentage of each node; i.e. an effort-based approach. This proposal is evaluated and compared to contribution-based strategies. The obtained results show that the proposed effort-based approach not only benefits participants that have scarce resources, but also it is able to satisfy the requests of the powerful nodes.

    Collaborative and volunteer applications need to implement incentive mechanisms to regulate resource sharing and encourage network nodes to contribute for reaching a certain goal. Typically, these incentive mechanisms assign resources to network node requests, based on the total amount of resources contributed by the requesting participant. This approach assumes that participants contributing more should also get back more resources from the collaborative environment. This assumption turns the system unfair to those participants with scarce resources, because they have just few resources to share. This paper proposes the use of an incentive strategy based on the contribution percentage of each node; i.e. an effort-based approach. This proposal is evaluated and compared to contribution-based strategies. The obtained results show that the proposed effort-based approach not only benefits participants that have scarce resources, but also it is able to satisfy the requests of the powerful nodes.

  • Incentivos basados en el esfuerzo para compartir recursos en aplicaciones colaborativas

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix; Navarro Moldes, Leandro
    Jornadas de Concurrencia y Sistemas Distribuidos
    Presentation's date: 2013-06-20
    Presentation of work at congresses

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    Las aplicaciones colaborativas voluntarias necesitan implementar mecanismos de incentivos para regular la compartición de los recursos y fomentar la contribución de los nodos de la red. Por lo general, estos mecanismos de incentivos asignan recursos a los nodos bajo petición, y se basan en la cantidad total de los recursos aportados por el solicitante. Este enfoque asume que los participantes que más contribuyen deben también obtener más recursos del entorno colaborativo. Esta suposición hace el sistema injusto para los participantes con escasos recursos ya que tienen problemas para compartir debido a sus pocos recursos. En este trabajo proponemos el uso de una estrategia de incentivos basada en la relación entre la contribución y los recursos de cada nodo, es decir, un enfoque basado en el esfuerzo. Evaluamos y comparamos esta propuesta con las estrategias basadas en la contribución. Los resultados obtenidos muestran que el enfoque propuesto basado en el esfuerzo no sólo beneficia a los participantes que cuentan con escasos recursos, sino también es capaz de satisfacer las peticiones de los nodos con mayores recursos.

  • The Internet of things to support urban incident responses

     Santos, Rodrigo; Orozco, Javier; Ochoa, Sergio; Meseguer Pallares, Roque
    International Conference on Ubiquitous Computing & Ambient Intelligence
    Presentation's date: 2013-12
    Presentation of work at congresses

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    Although the technological components required to implement Internet of Things (IoT) inspired solutions are already available, in most application scenarios it is not clear how to structure and combine them to reach a certain global behavior of a system. This paper proposes an architecture that helps design IoT-based systems that support the first responses during medium-size or large urban incidents. The main components of this architecture are characterized and the interactions between them are also specified. The usefulness of the proposed architecture is illustrated through its hypothetical use in a real urban emergency. The use of this proposal could be extended to other application areas such as security operatives and monitoring of patients at home.

  • Sharing hardware resources in heterogeneous computer-supported collaboration scenarios

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Ochoa, Sergio; Pino, José; Freitag, Felix; Medina, Esunly; Royo Valles, Maria Dolores
    Integrated computer-aided engineering
    Date of publication: 2013-01
    Journal article

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  • Reducing energy consumption in human-centric wireless sensor networks

     Meseguer Pallares, Roque; Molina Clemente, Carlos; Ochoa, Sergio; Santos, Rodrigo
    Systems, Man, and Cybernetics
    Presentation's date: 2012-10
    Presentation of work at congresses

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    Energy consumption is a main research issue in wireless sensor networks; and particularly in those where nodes collaborate to reach a goal. This article explores the energy consumption in mobile devices participating in a human-based wireless sensor network. Specifically, the paper proposes the use of a message predictor to help detect and reduce the number of unnecessary control packets delivered by the nodes as a way to keep updated the network topology. In order to evaluate this proposal, the Optimized Link State Routing protocol was modified to add a message predictor between the routing and the network layers. Eleven simulations were performed using a particular setting. The preliminary results indicate the use of the message predictor can help reduce considerably the nodes energy consumption without affecting the routing capability of the protocol. Although these results are still preliminary, they are highly encouraging.

  • Topology patterns of a community network: Guifi.net

     Vega D'Aurelio, Davide; Cerdà Alabern, Llorenç; Navarro Moldes, Leandro; Meseguer Pallares, Roque
    IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
    Presentation's date: 2012-10
    Presentation of work at congresses

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  • Communication support for mobile collaborative work: an experimental study

     Meseguer Pallares, Roque; Medina Medina, Esunly; Ochoa, Sergio; Pino, José; Neyem, Andres; Navarro Moldes, Leandro; Royo Valles, Maria Dolores
    International journal of information technology and decision making
    Date of publication: 2012-11
    Journal article

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  • Estimación automática de grupos en entornos de aprendizaje cooperativo con aplicaciones sensibles al contexto  Open access

     Meseguer Pallares, Roque
    Defense's date: 2012-03-02
    Department of Computer Architecture, Universitat Politècnica de Catalunya
    Theses

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    In collaborative learning scenarios, the use of computers and communication networks to facilitate collaboration is becoming popular, the Computer-Supported Collaborative Learning (CSCL). In face-to-face CSCL scenarios, participants are grouped for learning activities. The location information of the participants, very useful for computational support, may involve additional configuration work for students or teachers themselves. Mobile devices that facilitate this cooperation have evolved into ubiquitous computing. Sensing devices can capture context information that allows automate the detection of the location of users and objects involved in the learning scenario and use this contextual information to improve the support offered by computers. This thesis deals in detail the problem of computational support to the detection and management of learning groups in faceto-face CSCL environments. Our research has focused on the proposal of a system that automates the management of groups in these scenarios collecting and processing contextual information from sensors. To do this we have proposed a context model for this use and we have identified what information is most relevant to this domain application. This process of modeling and identification have been theoretical ---from conceptual frameworks that have allowed us to define a model of context--- and experimental ---from assessing the quality, reliability and sensitivity of contextual information in realistic environments---. Then we have verified how this contextual information fits the contextual model. Contextual information can pass through several stages before being used. First, the contextual information collected by the sensors could be conditioned and filtered to treat quality and uncertainty. Then it is supplied to an intelligent system that learns behavior patterns of groups and students. This intelligent system requires two different operating processes: training and estimation. We have proposed specific training and assessment processes for prediction and management of groups. The output also could be conditioned as it was done with the input. Finally, we used traces of contextual information in real scenarios ---real students doing group learning activities--- to validate the system. In this validation we have taken into account both the effectiveness and their impact on the activity of students and groups. From this impact assessment we have identified patterns in the contextual information and in the behavior that have allowed us to design a system of quality, error and uncertainty management in the group estimation and a filtering system and interpolation of contextual information ambiguous, missing or erroneous, and filtering and interpolation system of ambiguous, missing or erroneous contextual information. Our thesis is that to provide computational support to the detection and management of learning groups in face-to-face CSCL environments we need three basic functionalities: 1) the collection and filtering of changes in contextual information in realtime for each student and adjust them in the context model, 2) the transformation of this contextual information and thier historical to group membership by an intelligent algorithm and 3) the quality management of group estimations to minimize the impact on activity of students because of the uncertainty of these estimations.

    En escenaris d’aprenentatge col·laboratiu, s'ha introduït l’ús d’ordinadors i xarxes de comunicacions per facilitar aquesta col·laboració, l’anomenat “Computer-Supported Collaborative Learning” (CSCL). En escenaris CSCL presencials els participants s’agrupen per realitzar activitats d’aprenentatge. Aquesta informació sobre la disposició dels participants, de gran utilitat per al suport computacional, pot suposar un treball addicional de configuració per als propis estudiants o els professors. Els dispositius electrònics per facilitar aquesta cooperació han evolucionat fins la computació ubiqua, en la que dispositius sensors poden captar informació que permet a las aplicacions informàtiques automatitzar la detecció de la ubicació dels usuaris i objectes participants en l’escenari d’aprenentatge i usar aquesta informació contextual per millorar el suport ofert per els dispositius.Aquesta tesis tracta amb detall el problema del suport computacional a la detecció i gestió de grups d’aprenentatge en entorns CSCL presencials. La nostra investigació s’ha centrat en proposar un sistema que a partir de la recollida d’informació contextual proporcionada per sensors, automatitzi la gestió de grups en aquests escenaris CSCL presencials.Per açò hem proposat un modelo de context per aquest ús i hem identificat quina informació es mes rellevant per aquest proposit. Aquest modelat i identificació han estat tant teòrics ---a partir de marcs conceptuals que ens han permès definir un modelo de context--- com experimentals ---a partir de l’avaluació de la qualitat, fiabilitat i sensibilitat de la informació contextual en entorns realistes---. Finalment hem verificat cóm aquest informació contextual del nostre escenari s’adapta a aquest model.La informació contextual passa per varies fases per poder ser usada. Primer aquesta informació percebuda per els sensors es pot condicionar i filtrar per tractar la seva qualitat i incertesa. A continuació es subministra a un sistema intel·ligent que aprèn els patrons de funcionament dels grups i estudiants. Aquest sistema intel·ligent requereix dos processos diferents de funcionament: l’entrenament i l’estimació. Nosaltres hem proposat uns processos d’entrenament i estimació específics per la predicció i gestió de grups. També es pot tornar a condicionar la sortida igual que s’ha fet amb l’entrada.Finalment, per la validació del sistema hem utilitzat traces d’informació contextual d’escenaris reals ---amb estudiants reals realitzant activitats d’aprenentatge en grup---. En aquesta validació hem tingut present tant l’eficàcia del sistema como el seu impacte en l’activitat dels estudiants i grups. A partir d’aquest impacte hem identificat patrons en la informació contextual y en el comportament que ens ha permès introduir un sistema de gestió de la qualitat, errors i incertesa en la estimació, així com un sistema de filtratge i interpolació de la informació contextual ambigua, inexistent o errònia.La nostra tesis es que per proporcionar suport computacional a la detecció i estimació de grups de treball en activitats d'aprenentatge presencial en entorns CSCL són necessàries tres funcionalitats bàsiques: 1) la recol·lecció i filtrat en temps real dels canvis de la informació contextual de cada estudiant i recollir-los en el model contextual, 2) la transformació d'aquesta informació contextual el seu històric a informació contextual de grup per part d'un algoritme intel·ligente i 3) la gestió de la qualitat de les estimacions de grup per minimitzar l'impacte en l'atenció dels estudiants degut a la incertesa d'aquestes estimacions.

    En escenarios de aprendizaje colaborativo, se ha introducido el uso de ordenadores y redes de comunicación para facilitar esta colaboración, el llamado “Computer-Supported Collaborative Learning” (CSCL). En escenarios CSCL presenciales los participantes se agrupan para realizar actividades de aprendizaje. La información sobre la disposición de los participantes, de gran utilidad para dar soporte computacional, puede suponer un trabajo adicional de configuración para los propios estudiantes o los profesores. Los dispositivos electrónicos para facilitar esta cooperación han evolucionado hasta la computación ubicua, en que dispositivos sensores pueden captar información que permite a las aplicaciones informáticas automatizar la detección de la ubicación de los usuarios y objetos participantes en el escenario de aprendizaje y usar esa información contextual para mejorar el soporte ofrecido.Este trabajo trata con detalle el problema del soporte computacional a la detección y gestión de grupos de aprendizaje en entornos CSCL presenciales. Nuestra investigación se ha centrado en proponer un sistema que a partir de la recogida de información contextual proveniente de sensores, automatice la gestión de grupos en estos escenarios CSCL presenciales.Para ello hemos propuesto un modelo de contexto para este uso y hemos identificado qué información es más relevante para este propósito. Este modelado e identificación han sido tanto teóricos ---a partir de marcos conceptuales que nos han permitido definir un modelo de contexto--- como experimentales ---a partir de la evaluación de la calidad, fiabilidad y sensibilidad de la información contextual en entornos realistas---. Finalmente hemos verificado cómo esta información contextual de nuestro escenario se adapta a este modelo.La información contextual pasa por varias fases para ser usada. Primero esta información percibida por los sensores se puede acondicionar y filtrar para tratar su calidad e incertidumbre. A continuación se suministra a un sistema inteligente que aprende los patrones de funcionamiento de los grupos y estudiantes. Este sistema inteligente requiere dos procesos diferentes de funcionamiento: el entrenamiento y la estimación. Nosotros hemos propuesto unos procesos de entrenamiento y estimación específicos para la predicción y gestión de grupos. También se puede volver a acondicionar la salida como ya se ha hecho con la entrada.Finalmente, para la validación del sistema hemos utilizado trazas de información contextual de escenarios reales ---con estudiantes reales realizando actividades de aprendizaje en grupo---. En esta validación hemos tenido en cuenta tanto la eficacia del sistema como su impacto en la actividad de los estudiantes y grupos. A partir de este impacto hemos identificado ciertos patrones en la información contextual y en el comportamiento que nos ha permitido introducir un sistema de gestión de la calidad, errores e incertidumbre en la estimación así como un sistema de filtrado e interpolación de la información contextual ambigua, inexistente o errónea.Nuestra tesis es que para proporcionar soporte computacional a la detección y estimación de grupos de trabajo en actividades de aprendizaje presenciales en entornos CSCL son necesarias tres funcionalidades básicas: 1) la recolección y filtrado en tiempo real de los cambios de la información contextual de cada estudiante y recogerlos en el modelo contextual, 2) la transformación de esta información contextual y su histórico a información contextual de grupo por parte de un algoritmo inteligente y 3) la gestión de la calidad de las estimaciones de grupo para minimizar el impacto en la atención de los estudiantes debido a la incertidumbre de estas estimaciones.

  • Characterizing the effects of sharing hardware resources in mobile collaboration scenarios

     Vega D'Aurelio, Davide; Medina Medina, Esunly; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Freitag, Felix; Ochoa, Sergio; Pino, José
    International Conference on Computer Supported Cooperative Work in Design
    Presentation's date: 2011
    Presentation of work at congresses

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    Diseño e implementación de un simulador para explorar la cooperación en entornos distribuidos  Open access

     Vega D'Aurelio, Davide; Meseguer Pallares, Roque; Freitag, Felix
    Jornadas de Concurrencia y Sistemas Distribuidos
    Presentation's date: 2011-06
    Presentation of work at congresses

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    Los avances tecnológicos en los sistemas de comunicación y computación móviles están impulsando la emergencia de sistemas colaborativos distribuidos. No obstante, la participación de los usuarios se ve frenada por los escasos recursos disponibles en los dispositivos móviles actuales. En este artículo se presenta un simulador de redes colaborativas descentralizadas que permite estudiar cómo la topología de la red y las estrategias de los diferentes participantes pueden incentivar y mejorar su participación activa {colaboración{ en este tipo de escenarios. Los resultados obtenidos en las simulaciones realizadas sobre redes de overlay, nos han permitido realizar observaciones importantes en cuánto a cómo distribuir los recursos en las redes con dispositivos heterogéneos, qué tipo de estrategias de colaboración y colocación de nodos o qué topologías pueden incentivar la participación activa. Por ello, consideramos el simulador una buena herramienta para analizar este tipo de escenarios desde un punto de vista empírico.

  • A node placement heuristic to encourage resource sharing in mobile computing

     Vega D'Aurelio, Davide; Medina Medina, Esunly; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Freitag, Felix
    International Conference on Computational Science and Its Applications
    Presentation's date: 2011-06-23
    Presentation of work at congresses

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  • SISTEMAS DISTRIBUIDOS AUTO-ADAPTABLES PARA LA INTERNET DEL FUTURO

     Chacin Martinez, Pablo Jesus; Royo Valles, Maria Dolores; Freitag, Felix; Meseguer Pallares, Roque; Reyes Muñoz, M. Angélica; Gallardo Gomez, Antonia; Vega D'Aurelio, Davide; Brunner, René; León Gutiérrez, Xavier; Medina Medina, Esunly; Lopez Berga, Ester; Navarro Moldes, Leandro
    Participation in a competitive project

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  • Community Networks Testbed for the Future Internet

     Freitag, Felix; León Gutiérrez, Xavier; Meseguer Pallares, Roque; Lopez Berga, Ester; Vega D'Aurelio, Davide; Cerdà Alabern, Llorenç; Navarro Moldes, Leandro
    Participation in a competitive project

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  • A communication infrastructure to ease the development of mobile collaborative applications

     Rodri­guez-Covili, Juan; Ochoa, Sergio; Pino, José; Meseguer Pallares, Roque; Medina Medina, Esunly; Royo Valles, Maria Dolores
    Journal of network and computer applications
    Date of publication: 2011
    Journal article

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    Mobile workers doing loosely coupled activities typically perform on demand collaboration in the physical workplace. Communication services available in such work scenarios are uncertain, therefore mobile collaborative applications supporting those activities must provide ad hoc communication mechanisms in order to use each cooperation opportunity. Typically, the complexity of implementing such mobile ad hoc communication mechanisms becomes a challenge that jeopardizes the development of mobile collaborative solutions. This article presents a communication infrastructure named HLMP API dealing with that challenge. HLMP API intends to ease the development of such applications through the reuse of communication services. The infrastructure is an application programming interface that implements the HLMP routing protocol and also some awareness mechanisms that are required for mobile loosely coupled work. Developers using this infrastructure do not have to perform low-level programming.

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    Supporting context-aware collaborative learning through automatic group formation  Open access

     Meseguer Pallares, Roque; Medina Medina, Esunly; Royo Valles, Maria Dolores; Navarro Moldes, Leandro; Damian-Reyes, Pedro; favela, jesus
    Ubiquitous Computing & Ambient Intelligence
    Presentation's date: 2010-09-10
    Presentation of work at congresses

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    Collaborative learning is based on groups of students working together with traditional and computer-based tools or applications. We have found that to make these supporting applications more effective we need to address the problem of automating group awareness in CSCL applications by estimating group arrangements from location sensors and the history of interaction. This contextual information can enable the construction of applications that facilitate communication among group members in synchronous and collocated collaborative learning activities. We used data traces collected from the study of students‟ behavior to train and test an intelligent system. Results show that context-information can be effectively used as a basis for a middleware for automating group management. Inferring group membership is technically feasible, can be integrated in group-support applications and can be used in real-world settings.

  • L'ús d'Atenea per co-avaluació entre grups  Open access

     Meseguer Pallares, Roque
    Dia d'Atenea
    Presentation's date: 2010
    Presentation of work at congresses

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    Atenea pot ser de gran utilitat per fer certes activitats de co-avaluació. Les co-avaluacions en una forma tradicional poden ser complexes de gestionar. L'exemple mes clar pot ser que un grup avaluï un document, pòster o presentació d'altres grups. Aquí presentarem com fer-ho amb l'activitat Fòrum. Encara Atenea té l'activitat taller per fer-ho a nosaltres ens ha donat molt bons resultats l'ús del Fòrum.

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    HLMP API: A software library to support the development of mobile collaborative applications  Open access

     Rodriguez-Covili, Juan Francisco; Ochoa, Sergio; Pino, José; Meseguer Pallares, Roque; Medina Medina, Esunly; Royo Valles, Maria Dolores
    International Conference on Computer Supported Cooperative Work in Design
    Presentation's date: 2010-04
    Presentation of work at congresses

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    Mobile collaborative applications are usually deployed in work scenarios where the existence of fixed communication infrastructure is hard to predict. For that reason, these applications use Mobile Ad hoc Networks (MANETs) to support communication between mobile users. The complexity involved in such communication infrastructures make that developers avoid developing software for mobile work scenarios. However, it is possible to provide a reusable abstraction of such communication mechanisms, in order to avoid that developers have to deal with low-level programming. This article presents HLMP API, which is an application programming interface that provides access to a HLMP implementation. This API is organized as a fully distributed mobile communication infrastructure, able to run on MANETs. This infrastructure provides an important set of services, which are required to support mobile collaboration. The reuse of these services allows developers to reduce the complexity, times and cost of these development projects.

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    Group Prediction in Collaborative Learning  Open access

     Meseguer Pallares, Roque; Medina Medina, Esunly; Royo Valles, Maria Dolores; Navarro Moldes, Leandro; Juárez, Juan Pablo
    International Conference on Intelligent Environments
    Presentation's date: 2010-07-21
    Presentation of work at congresses

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    We propose an approach for predicting group formations, to address the problem of automating the incorporation of group awareness into CSCL applications. Contextual information can enable the construction of applications that effectively assist the group members to automatically communicate in synchronous and collocated collaborative learning activities. We used data traces collected from the study of students’ behavior to train and test an intelligent system. Results have shown that context-information can be effectively used as a basis for a middleware for a dynamic group management. Inferring group membership is technically viable and can be used in real world settings.

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    OLSRp: predicting control information to achieve scalability in OLSR ad hoc networks  Open access

     Medina Medina, Esunly; Meseguer Pallares, Roque; Molina Clemente, Carlos; Royo Valles, Maria Dolores
    International ICST Conference on Mobile Networks and Management
    Presentation's date: 2010-09-23
    Presentation of work at congresses

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    Scalability is a key design challenge that routing protocols for ad hoc networks must properly address to maintain the network performance when the number of nodes increases. We focus on this issue by reducing the amount of control information messages that a link state proactive routing algorithm introduces to the network. Our proposal is based on the observation that a high percentage of those messages is always the same. Therefore, we introduce a new mechanism that can predict the control messages that nodes need for building an accurate map of the network topology so they can avoid resending the same messages. This prediction mechanism, applied to OLSR protocol, could be used to reduce the number of messages transmitted through the network and to save computational processing and energy consumption. Our proposal is independent of the OLSR configuration parameters and it can dynamically self-adapt to network changes.

  • Wildfire Monitoring Using a Mixed Air-Ground Mobile Network

     Barrado Muxí, Cristina; Meseguer Pallares, Roque; López Rubio, Juan; Pastor Llorens, Enrique; Santamaria Barnadas, Eduard; Royo Chic, Pablo
    IEEE pervasive computing
    Date of publication: 2010
    Journal article

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  • Context awareness for collaborative learning with uncertainty management

     Meseguer Pallares, Roque; Damián-Reyes, Pedro; Favela Vara, Jesús; Navarro Moldes, Leandro
    Journal of universal computer science
    Date of publication: 2010-06-28
    Journal article

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    Context awareness is a necessary feature for mobile collocated collaborative learning. In this paper we describe how requirements for contextaware cooperative learning activities are derived from the jigsaw technique augmented with the use of mobile devices, applications to support the activities of groups, and tools to provide context-awareness to detect group formation. The emergence of groups is detected based on the location of the students within the classroom, but this information has to be careful filtered to evaluate the degree of uncertainty and protect from erroneous estimations. A three-phase strategy to manage uncertainty by identifying possible sources of uncertainty, representing uncertain information, and determining how to proceed under the presence of uncertainty is used for this propose. These requirements are validated and confirmed in experiments with students working together in the classroom, measuring neutral or positive effects on learning and the usefulness of introducing mobile devices, group support applications, and context awareness. The ratio of unwanted interruptions to users made by the system is used to evaluate the utility of the system. Results show that by managing uncertainty, location estimation becomes more reliable, thus increasing the usefulness of the learning application.

  • GRID Resource Searching on the GridSim Simulator

     Gallardo Gomez, Antonia; Díaz Cerio, Luis; Meseguer Pallares, Roque; Isern-Deya, AP; Sanjeevan, Kanapathipillai
    Lecture notes in computer science
    Date of publication: 2009-01
    Journal article

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  • Qualitat a l'aula: l'assignatura com un procés  Open access

     Hernandez Marco, Jordi; Jordana Barnils, Josep; Meseguer Pallares, Roque; Valero Garcia, Miguel
    Jornada d'Innovació Docent UPC
    Presentation's date: 2009-06
    Presentation of work at congresses

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  • L'ús d'Atenea per gestionar l'assignació de temes, horaris, grups...  Open access

     Meseguer Pallares, Roque
    Dia d'Atenea
    Presentation's date: 2009
    Presentation of work at congresses

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    Atenea pot ser de gran utilitat per fer certes assignacions. Assignacions que en una forma tradicional poden ser complexes. Els exemples mes clars poden ser: con assignar algun tema de treballar a cada estudiant, com assignar un horari de tutoria, consulta o demostracions a cada estudiant, com assignar els estudiants a grups de treball,... Per aquestes tasques podem utilitzar l’eina Consulta i que els estudiants participen de forma activa en aquestes assignacions.

  • IE09.Conferencia internacional: Intelligent Environments 2009 (IE09, quinta edición)

     Royo Valles, Maria Dolores; Freitag, Felix; Reyes Muñoz, M. Angélica; Meseguer Pallares, Roque; Navarro Moldes, Leandro
    Participation in a competitive project

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  • Building Real-World Ad-Hoc Networks to Support Mobile Collaborative Applications: Lessons Learned

     Meseguer Pallares, Roque; Ochoa, Sergio; Pino, José; Medina Medina, Esunly; Navarro Moldes, Leandro; Royo Valles, Maria Dolores; Neyem, Andres
    International Workshop on Groupware
    Presentation's date: 2009-09-01
    Presentation of work at congresses

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    Mobile collaboration is required in several work scenarios, i.e. education, healthcare, business and disaster relief. The features and capabilities of the communication infrastructure used by mobile collaborative applications will influence the type of coordination and collaboration that can be supported in real work scenarios. Developers of these applications are typically unaware of the constraints the communication infrastructure imposes on the collaborative system. Therefore, this paper presents an experimental study of how ad-hoc networks can effectively support mobile collaborative work. The article analyzes several networking issues and it determines how they influence the collaborative work. The paper also presents the lessons learned and it provides recommendations to deal with the networking issues intrinsic to adhoc networks.

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    Topology-aware group communication middleware for MANETs  Open access

     Garcia-Lopez, Pedro; Gracia, Raúl; Espelt, Marc; París, Gerard; Arrufat, Marcel; Meseguer Pallares, Roque
    Conference on Communication System Software and Middleware
    Presentation's date: 2009-06
    Presentation of work at congresses

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    We believe that any MANET middleware should be aware of the underlying multi-hop routing protocol to improve communication efficiency. In general, existing MANET middleware either ignore the underlying routing protocol or create specific cross-layer solutions that break the strict layering of the network stack. This problem is even more severe in the case of traditional group communication middleware (GC) where membership protocols, failure detection mechanisms or flow control layers can considerably harm the overall performance of the network. We propose to move the routing logic to the application layer in order to achieve a smooth and clean integration between the middleware and the underlying MANET topology. In this line, we have modified a well-known GC toolkit (JGroups) in order to adapt membership protocols, failure detectors and flow control mechanisms to the underlying MANET topology. We have implemented the MANET OLSR protocol in the application layer using UDP (jOLSR). On top of it, we have developed an overlay Multicast protocol (OMOLSR) that directly benefits from the OLSR protocol to improve communication efficiency. As a consequence, in our middleware group membership is obtained from OMOLSR, failure detection from the jOLSR protocol, and our modified flow control protocol benefits from jOLSR topology information. We validate our approach in a real test-bed to demonstrate the feasibility and efficiency of our middleware.

  • Grid resource searching on the gridsim simulator

     Gallardo Gomez, Antonia; Diaz de Cerio Ripalda, Luis Manuel; Meseguer Pallares, Roque; Isern-Deyà, A P; Sanjeevan, Kanapathipillai
    International Conference on Computational Science
    Presentation of work at congresses

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  • Context Awareness and Uncertainty in Collocated Collaborative Systems

     Meseguer Pallares, Roque; Damián-Reyes, Pedro; Favela Vara, Jesús; Navarro Moldes, Leandro
    Lecture notes in computer science
    Date of publication: 2008-01
    Journal article

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  • P2PGRID: Self-adjusting Peer-to-peer and Grid Systems (TIN2007-68050-C03-01)

     Chacin Martinez, Pablo Jesus; Navarro Moldes, Leandro; Reyes Muñoz, M. Angélica; Gallardo Gomez, Antonia; Freitag, Felix; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Artigas Vidal, Pau; Marques Puig, Joan Manel; Sanjeevan, Kanapathipillai; Brunner, René; León Gutiérrez, Xavier; Medina Medina, Esunly
    Participation in a competitive project

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    Communication and coordination patterns to support mobile collaboration  Open access

     Meseguer Pallares, Roque; Ochoa, Sergio; Pino, José; Navarro Moldes, Leandro; Neyem, Andres
    International Conference on Computer Supported Cooperative Work in Design
    Presentation's date: 2008-05
    Presentation of work at congresses

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    Wireless communication and mobile computing technologies have brought new opportunities and challenges to the CSCW area. Traditional CSCW solutions concerning communication and coordination support are not applicable to mobile collaboration scenarios. Therefore, new reusable solutions have to be proposed in order to ease the development of mobile collaborative applications. This paper presents a set of design patterns to support communication and coordination in mobile ad-hoc scenarios. These two aspects are the basis to support mobile collaboration.

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    Mobile access to the services in Ambient Networks  Open access

     Reyes Muñoz, M. Angélica; Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Homar, Carlos
    International Conference on Intelligent Environments
    Presentation's date: 2008-06-21
    Presentation of work at congresses

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    Ambient Networks will enable mobile terminals to communicate in an environments populated by several networks, devices, services and artefacts in a transparent way to the final user. In these scenarios, one way of implementing services uses web service architecture. So it is important to study how these mobile devices will integrate efficiently to access web services. Because of the reduced capabilities of the mobile devices, their access to web services is not easy and might have some performance costs related to show data speeds and processing both HTTP commands and XML. Moreover, sOlne mobile devices could not support web service access and if supported it lacks of web service search engine. In order to allow mobile devices to access web services efficiently, giving a solution to the previous problems, we propose a new architecture based on a peer-to-peer with distributed hash tables network, as a gateway between the mobile device and web service. This architecture is a base software simulator for an Anlbient Network environnlent developed in our research group. Nodes of the peer-topeer network publish services, allow finding them easily and acting as a gateway to the mobile devices for accessing web services more efficiently.

  • Context awareness and uncertainty in collocated collaborative systems

     Meseguer Pallares, Roque; Damián-Reyes, Pedro; Favela Vara, Jesús; Navarro Moldes, Leandro
    Groupware: design, implementation and use
    Presentation's date: 2008-09-01
    Presentation of work at congresses

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  • SNAF: A Service Naming and Addressing Framework for SerAn Platform

     Royo Valles, Maria Dolores; Reyes Muñoz, M. Angélica; Meseguer Pallares, Roque; Martinez, R
    International Conference on Intelligent Environments
    Presentation of work at congresses

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  • Uncertainty Management in Context-aware Collaborative Uncertainty Management in Context-aware Collaborative Learning

     Meseguer Pallares, Roque
    II Simposio de Computación Ubicua e Inteligencia Ambiental, UCAmI 2007
    Presentation's date: 2007-09-13
    Presentation of work at congresses

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  • Uncertainty Management in Context-aware Collaborative Learning

     Damian Reyes, Pedro; Meseguer Pallares, Roque; Favela Vara, Jesús; Navarro Moldes, Leandro
    II Simposio de Computación Ubicua e Inteligencia Ambiental, UCAmI 2007
    Presentation of work at congresses

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  • SerAN:Service advanced management for ambient networks based on PASTRY

     Meseguer Pallares, Roque; Royo Valles, Maria Dolores; Reyes Muñoz, M. Angélica; Parra, R
    International Conference on Intelligent Environments
    Presentation of work at congresses

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  • Distinció de qualitat a les polítiques d'assegurament de la qualitat

     Valero Garcia, Miguel; Hernandez Marco, Jordi; Meseguer Pallares, Roque; Jordana Barnils, Josep
    Award or recognition

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  • Self Adjusting Large-Scale Distributed Systems (TIN2006-15614-C03-01)

     Navarro Moldes, Leandro; Reyes Muñoz, M. Angélica; Gallardo Gomez, Antonia; Freitag, Felix; Meseguer Pallares, Roque; Artigas Vidal, Pau; Marques Puig, Joan Manel; Chacin Martinez, Pablo Jesus
    Participation in a competitive project

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  • Group-awareness for Mobile Cooperative Learning

     Meseguer Pallares, Roque; Navarro Moldes, Leandro; Reyes Muñoz, M. Angélica
    The 4th International Workshop on Wireless, Mobile and Ubiquitous Technologies in Eduacation
    Presentation of work at congresses

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  • Group-awareness for Mobile Cooperative Learning

     Meseguer Pallares, Roque
    The 4th International Workshop on Wireless, Mobile and Ubiquitous Technologies in Eduacation
    Presentation's date: 2006-11-16
    Presentation of work at congresses

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  • Acreditació de la qualitat en sis assignatures de l'EPSC

     Hernandez Marco, Jordi; Bara Temes, Francisco Javier; Casas Piedrafita, Jaime Oscar; Jordana Barnils, Josep; Meseguer Pallares, Roque; Valero Garcia, Miguel
    Jornada d'Innovació Docent UPC
    Presentation of work at congresses

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  • Juegos en red como proyecto docente en ingeniería telemática

     Machado Sanchez, Sergio; Meseguer Pallares, Roque; Oller Arcas, Antonio; Reyes Muñoz, M. Angélica; Rincon Rivera, David; Yufera Gomez, Jose Manuel
    Jornadas de Ingeniería Telemática
    Presentation's date: 2005-09-12
    Presentation of work at congresses

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  • Recomendaciones para la implantación del PBL en créditos optativos basadas en la experiencia en la EPSC

     Meseguer Pallares, Roque
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2005-07-13
    Presentation of work at congresses

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  • Recomendaciones para la implantación del PBL en créditos optativos basadas en la experiencia en la EPSC

     Machado Sanchez, Sergio; Meseguer Pallares, Roque; Oller Arcas, Antonio; Reyes Muñoz, M. Angélica; Rincon Rivera, David; Yufera Gomez, Jose Manuel
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation of work at congresses

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  • On the impact of PBL-based teaching techniques in an optional course on distributed applications

     Machado Sanchez, Sergio; Meseguer Pallares, Roque; Oller Arcas, Antonio; Reyes Muñoz, M. Angélica; Rincon Rivera, David; Yufera Gomez, Jose Manuel
    International Conference on Engineering and Computer Education
    Presentation's date: 2005-11-12
    Presentation of work at congresses

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  • ULabGrid, an Infrastructure to Develop Distant Laboratories for Undergrad Students over a Grid

     Ardaiz Villanueva, Oscar; Artigas Vidal, Pau; Diaz de Cerio Ripalda, Luis Manuel; Freitag, Felix; Meseguer Pallares, Roque; Navarro Moldes, Leandro; Sanjeevan, Kanapathipillai; Royo Valles, Maria Dolores
    Lecture notes in computer science
    Date of publication: 2004-03
    Journal article

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  • Decentralized vs. Centralized Economic Coordination of Resource Allocation in Grids

     Eymann, Torsten; Reinicke, Michael; Ardaiz Villanueva, Oscar; Artigas Vidal, Pau; Diaz de Cerio Ripalda, Luis Manuel; Freitag, Felix; Meseguer Pallares, Roque; Navarro Moldes, Leandro; Royo Valles, Maria Dolores; Sanjeevan, Kanapathipillai
    Lecture notes in computer science
    Date of publication: 2004-03
    Journal article

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