Departament de Ciències de la Computació

Recent Submissions

  • An integrated approach for analysing and assessing the performance of virtual learning groups 

    Daradoumis, Thanasis; Martínez-Monés, Alejandra; Xhafa Xhafa, Fatos (Springer, 2004)
    Conference report
    Open Access
    Collaborative distance learning involves a variety of elements and factors that have to be considered and measured in order to analyse and assess group and individual performance more effectively and objectively. This paper ...

  • Global optimality in k-means clustering 

    Tîrnauca, Cristina; Gómez Pérez, Domingo; Balcázar Navarro, José Luis; Montaña Arnaiz, José Luis (2018-05-01)
    Article
    Restricted access - publisher's policy
    We study the problem of finding an optimum clustering, a problem known to be NP-hard. Existing literature contains algorithms running in time proportional to the number of points raised to a power that depends on the ...

  • Implementation of CAVENET and its usage for performance evaluation of AODV, OLSR and DYMO protocols in vehicular networks 

    Spaho, Evjola; Barolli, Leonard; Mino, Gjergji; Xhafa Xhafa, Fatos; Kolici, Vladi; Miho, Rozeta (HINDAWI, 2010)
    Article
    Open Access
    Vehicle Ad-hoc Network (VANET) is a kind of Mobile Ad-hoc Network (MANET) that establishes wireless connection between cars. In VANETs and MANETs, the topology of the network changes very often, therefore implementation ...

  • Performance evaluation of wireless sensor networks for mobile event and mobile sink 

    Yang, Tao; Ikeda, Makoto; Barolli, Leonard; Xhafa Xhafa, Fatos; Durresi, Arjan (2010-12)
    Article
    Open Access
    Extending lifetime and energy efficiency are important objectives and challenges in-Wireless Sensor Networks (WSNs). In large scale WSNs, when the nodes are near to the sink they consume much more energy than the nodes far ...

  • Application of JXTA-overlay platform for secure robot control 

    Spaho, Evjola; Matsuo, Keita; Barolli, Leonard; Xhafa Xhafa, Fatos; Arnedo Moreno, Joan; Kolici, Vladi (2010)
    Article
    Open Access
    In this paper, we present the evaluation and experimental results of secured robot control in a P2P system. The control system is based on JXTA-Overlay platform. We used secure primitives and functions of JXTA-Overlay for ...

  • Routing efficiency in wireless sensor-actor networks considering semi-automated architecture 

    Barolli, Leonard; Yang, Tao; Mino, Gjergji; Xhafa Xhafa, Fatos; Durresi, Arjan (2010)
    Article
    Open Access
    Wireless networks have become increasingly popular and advances in wireless communications and electronics have enabled the development of different kind of networks such as Mobile Ad-hoc Networks (MANETs), Wireless Sensor ...

  • Formal analysis of model transformations based on triple graph grammars 

    Hermann, Frank; Ehrig, Hartmut; Golas, Ulrike; Orejas Valdés, Fernando (2014-08-01)
    Article
    Open Access
    Triple graph grammars (TGGs) are a well-established concept for the specification and execution of bidirectional model transformations within model driven software engineering. Their main advantage is an automatic generation ...

  • A study into the feasibility of generic programming for the construction of complex software 

    Caballé Llobet, Santiago; Xhafa Xhafa, Fatos (tranSIT GmbH, 2003)
    Conference report
    Open Access
    A high degree of abstraction and capacity for reuse can be obtained in software design through the use of Generic Programming (GP) concepts. Despite widespread use of GP in computing, some areas such as the construction ...

  • A distributed hybrid index for processing continuous range queries over moving objects 

    Yu, Ziqiang; Xhafa Xhafa, Fatos; Chen, Yuehui; Ma, Kun (Springer, 2017-12-28)
    Article
    Restricted access - publisher's policy
    Central to many location-based services is the problem of processing concurrent continuous range queries over a large scale of moving objects. Most relevant works to this problem mainly investigate the centralized search ...

  • Towards a generic platform for developing CSCL applications using Grid infrastructure 

    Caballé Llobet, Santiago; Xhafa Xhafa, Fatos; Daradoumis, Thanasis; Marques Puig, Joan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2004)
    Conference report
    Open Access
    The goal of this paper is to explore the possibility of using CSCL component-based software under a Grid infrastructure. The merge of these technologies represents an attractive, but probably quite laborious enterprise if ...

  • A grid-based approach for processing group activity log files 

    Xhafa Xhafa, Fatos; Caballé Llobet, Santiago; Daradoumis, Thanasis; Zhou, Nan (Springer, 2004)
    Conference report
    Open Access
    The information collected regarding group activity in a collaborative learning environment requires classifying, structuring and processing. The aim is to process this information in order to extract, reveal and provide ...

  • WIT: a wireless integrated traffic model 

    Doci, Arta; Xhafa Xhafa, Fatos (HINDAWI, 2008)
    Article
    Open Access
    Simulation is a common approach for designing ad hoc network applications, due to the slow deployment of these networks. The main building blocks of ad hoc network applications are the routing protocols, mobility, and ...

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