Enviaments recents

  • A Tabu search algorithm for scheduling independent jobs in computational grids 

    Xhafa Xhafa, Fatos; Carretero Casado, Javier Sebastián; Dorronsoro, Bernabé; Alba, Enrique (2009)
    Article
    Accés obert
    The efficient allocation of jobs to grid resources is indispensable for high performance grid-based applications, and it is a computationally hard problem even when there are no dependencies among jobs. We present in this ...
  • A simulated annealing algorithm for router nodes placement problem in Wireless Mesh Networks 

    Xhafa Xhafa, Fatos; Barolli, Admir; Sánchez Lopez, Christian; Barolli, Leonard (2011-11)
    Article
    Accés obert
    Mesh router nodes placement is a central problem in Wireless Mesh Networks (WMNs). An efficient placement of mesh router nodes is indispensable for achieving network performance in terms of both network connectivity and ...
  • Enhancing knowledge management in online collaborative learning 

    Caballé Llobet, Santiago; Daradoumis, Thanasis; Xhafa Xhafa, Fatos; Conesa Caralt, Jordi (2010-06)
    Article
    Accés obert
    This paper aims to explore two crucial aspects of collaborative work and learning: on the one hand, the importance of enabling collaborative learning applications to capture and structure the information generated by group ...
  • A hyper-heuristic for adaptive scheduling in computational grids 

    Xhafa Xhafa, Fatos (2007-01)
    Article
    Accés obert
    In this paper we present the design and implementation of an hyper-heuristic for efficiently scheduling independent jobs in computational grids. An efficient scheduling of jobs to grid resources depends on many parameters, ...
  • Proof complexity meets algebra 

    Atserias, Albert; Ochremiak, Joanna (2018-12-01)
    Article
    Accés obert
    We analyze how the standard reductions between constraint satisfaction problems affect their proof complexity. We show that, for the most studied propositional, algebraic, and semialgebraic proof systems, the classical ...
  • Translation of neutrally evolving peptides provides a basis for de novo gene evolution 

    Ruiz Orera, Jorge; Verdaguer Grau, Pol; Villanueva Cañas, José Luis; Messeguer Peypoch, Xavier; Albà Soler, M. Mar (Springer, 2018-03-19)
    Article
    Accés obert
    Accumulating evidence indicates that some protein-coding genes have originated de novo from previously non-coding genomic sequences. However, the processes underlying de novo gene birth are still enigmatic. In particular, ...
  • Individual flip-flops with gated clocks for low power datapaths 

    Lang, Tomás; Cortadella, Jordi; Musoll Cinca, Enric (Institute of Electrical and Electronics Engineers (IEEE), 1997-06)
    Article
    Accés obert
    Energy consumption has become one of the important factors in digital systems, because of the requirement to dissipate this energy in high-density circuits and to extend the battery life in portable systems such as devices ...
  • Distributed-based massive processing of activity logs for efficient user modeling in a Virtual Campus 

    Caballé Llobet, Santiago; Xhafa Xhafa, Fatos (Kluwer Academic Publishers, 2013-12)
    Article
    Accés obert
    This paper reports on a multi-fold approach for the building of user models based on the identification of navigation patterns in a virtual campus, allowing for adapting the campus’ usability to the actual learners’ needs, ...
  • Effects of population size for location-aware node placement in WMNs: evaluation by a genetic algorithm--based approach 

    Oda, Tetsuya; Barolli, Admir; Spaho, Evjola; Barolli, Leonard; Xhafa Xhafa, Fatos; Younas, Muhammad (2014-02)
    Article
    Accés obert
    Wireless mesh networks (WMNs) are cost-efficient networks that have the potential to serve as an infrastructure for advanced location-based services. Location service is a desired feature for WMNs to support location-oriented ...
  • Efficient parallel LAN/WAN algorithms for optimization: The mallba project 

    Alba, E.; Almeida, F.; Blesa Aguilera, Maria Josep; Cotta Porras, Carlos; Díaz, M.; Dorta, Isabel; Gabarró Vallès, Joaquim; León Hernández, Coromoto; Luque, G.; Petit Silvestre, Jordi; Rodríguez, C.; Rojas, A.; Xhafa Xhafa, Fatos (2006-06)
    Article
    Accés obert
    The mallba project tackles the resolution of combinatorial optimization problems using generic algorithmic skeletons implemented in C++. A skeleton in the mallba library implements an optimization method in one of the three ...
  • Aligning textual and model-based process descriptions 

    Sánchez Ferreres, Josep; van der Aa, Han; Carmona Vargas, Josep; Padró, Lluís (Elsevier, 2018-01-01)
    Article
    Accés restringit per política de l'editorial
    Process model descriptions are an ubiquitous source of information that exists in any organization. To reach different types of stakeholders, distinct descriptions are often kept, so that process understandability is boosted ...
  • JXTA-Overlay: a P2P platform for distributed, collaborative, and ubiquitous computing 

    Barolli, Leonard; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2011-06)
    Article
    Accés obert
    With the fast growth of the Internet infrastructure and the use of large-scale complex applications in industries, transport, logistics, government, health, and businesses, there is an increasing need to design and deploy ...

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