Enviaments recents

  • Genetic algorithms for efficient placement of router nodes in wireless mesh networks 

    Xhafa Xhafa, Fatos; Sánchez Lopez, Christian; Barolli, Leonard (Institute of Electrical and Electronics Engineers (IEEE), 2010)
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    In Wireless Mesh Networks (WMNs) the meshing architecture, consisting of a grid of mesh routers, provides connectivity services to different mesh client nodes. The good performance and operability of WMNs largely depends ...
  • Scheduling in multiprocessor system using genetic algorithms 

    Dahal, Keshav P.; Hossain, Alamgir; Varghese, Benzy; Abraham, Ajith; Xhafa Xhafa, Fatos; Daradoumis, Thanasis (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    Multiprocessors have emerged as a powerful computing means for running real-time applications, especially where a uniprocessor system would not be sufficient enough to execute all the tasks. The high performance and ...
  • Implementation and design of new functions for a web-based E-Learning system to stimulate learners motivation 

    Matsuo, Keita; Barolli, Leonard; Xhafa Xhafa, Fatos; Koyama, Akio; Durresi, Arjan; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So ...
  • Evaluation of clustering techniques for efficient searching in JXTA-based P2P systems 

    Xhafa Xhafa, Fatos; Jaen, Enric; Daradoumis, Thanasis; Barolli, Leonard (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    The efficient file searching is an essential feature in P2P systems. While many current approaches use brute force techniques to search files by meta information (file names, extensions or user-provided tags), the interest ...
  • Hybrid performance modeling and prediction of large-scale computing systems 

    Pllana, Sabri; Benkner, Siegfried; Xhafa Xhafa, Fatos; Barolli, Leonard (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    Performance is a key feature of large-scale computing systems. However, the achieved performance when a certain program is executed is significantly lower than the maximal theoretical performance of the large-scale computing ...
  • Extending JXTA protocols for P2P file sharing systems 

    Xhafa Xhafa, Fatos; Barolli, Leonard; Fernández Correa, Raúl; Daradoumis, Thanasis; Caballé Llobet, Santiago; Kolici, Vladi (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    File sharing is among the most important features of the today's Internet-based applications. Most of such applications are server-based approaches inheriting thus the disadvantages of centralized systems. Advances in P2P ...
  • Design and implementation of a JXTA-Overlay P2P system and smart box environment 

    Matsuo, Keita; Barolli, Leonard; Xhafa Xhafa, Fatos; Koyama, Akio; Durresi, Arjan; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    In this paper, we present the design and implementation of the JXTA-based e-Learning P2P system. We also show the design and implementation of a smart box environment that will be used for stimulating the learners to ...
  • Design and evaluation of a tabu search method for job scheduling in distributed enviorments 

    Xhafa Xhafa, Fatos; Carretero Casado, Javier Sebastián; Alba, Enrique; Dorronsoro, Bernabe (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    The efficient allocation of jobs to grid resources is indispensable for high performance grid-based applications. The scheduling problem is computationally hard even when there are no dependencies among jobs. Thus, we ...
  • Efficient peer selection in P2P JXTA-based platforms 

    Xhafa Xhafa, Fatos; Daradoumis, Thanasis; Barolli, Leonard; Fernandez Correa, Raul; Caballé Llobet, Santiago; Kolici, Vladi (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    P2P systems are nowadays being used not only for file sharing but also for developing large-scale distributed applications. As an emerging paradigm for distributed computing, P2P systems are raising important issues as ...
  • Developing an information system for monitoring student's activity in online collaborative learning 

    Juan Pérez, Ángel Alejandro; Daradoumis, Thanasis; Faulín Fajardo, Francisco Javier; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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    In this paper we address the issue of monitoring students’ and groups’ activity in online collaborative learning environments. This issue is especially important in the collaborative e-learning context, since an efficient ...
  • Network energy consumption in ad-hoc networks under different radio models 

    Yang, Tao; Barolli, Leonard; Ikeda, Makoto; Durresi, Arjan; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2007)
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    In this work, we consider the behavior of a wireless ad- hoc network under TwoRayGround and Shadowing radio models. By means of simulations, we analyze the performance of three routing protocols: AODV, DSR, and DSDV, and ...
  • A cluster head selection method for wireless sensor networks based on fuzzy logic 

    Anno, Junpei; Barolli, Leonard; Xhafa Xhafa, Fatos; Durresi, Arjan (Institute of Electrical and Electronics Engineers (IEEE), 2007)
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    Sensor networks supported by recent technological advances in low power wireless communications along with silicon integration of various functionalities are emerging as a critically important computer class that enable ...

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