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Ara es mostren els items 277-296 de 403

    • On Berners-Lee computer, hints on navigability semantics and lack of referential integrity 

      Gabarró Vallès, Joaquim; Vallejo, Isabel; Xhafa Xhafa, Fatos (2005-03)
      Report de recerca
      Accés obert
      In this paper we deal with semantics issues related to the stability, navigability and extensibility of web applications. To this end, we define a web application as a deterministic labelled transition system in which ...

    • On parallel versus sequential approximation 

      Serna Iglesias, María José; Xhafa Xhafa, Fatos (1995-03)
      Report de recerca
      Accés obert
      In this paper we deal with the class NCX of NP Optimization problems that are approximable within constant ratio in NC. This class is the parallel counterpart of the class APX. Our main motivation here is to reduce the ...

    • On sharing and synchronizing groupware calendars under android platform 

      Xhafa Xhafa, Fatos; Palou, Daniel; Caballé Llobet, Santiago; Barolli, Leonard (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés obert
      Sharing a calendar of tasks and events is a cornerstone in collaborative group work. Indeed, the individual work of the members of the group as well as the group work as a whole need the calendar to guide their activity ...

    • On the average complexity of some P-complete problems 

      Serna Iglesias, María José; Xhafa Xhafa, Fatos (1995-10)
      Report de recerca
      Accés obert
      We show that some P-complete problems can be solved efficiently in average NC. The probabilistic model we consider is the sample space of input instances with underlying distribution the uniform one. The parallel algorithms ...

    • On the depth of randomly generated circuits 

      Tsukiji, Tatsuie; Xhafa Xhafa, Fatos (1996-03-02)
      Report de recerca
      Accés obert
      This research is motivated by the Circuit Value Problem; this problem is well known to be inherently sequential. We consider Boolean Circuits with descriptions of length d that consist of gates with a fixed fan-in f and a ...

    • On the parallel approximability of some classes of quadratic programming 

      Serna Iglesias, María José; Xhafa Xhafa, Fatos (1996-01)
      Report de recerca
      Accés obert
      In this paper we analyze the parallel approximability of two special classes of Quadratic Programming. First, we consider Convex Quadratic Programming . We show that the problem of Approximating Convex Quadratic Programming ...

    • On the performance of Oracle Grid Engine Queuing System for computing intensive applications 

      Kolici, Vladi; Herrera, Albert; Xhafa Xhafa, Fatos (2014)
      Article
      Accés restringit per política de l'editorial
      In this paper we present some research results on computing intensive applications using modern high performance architectures and from the perspective of high computational needs. Computing intensive applications are an ...

    • OPoR: enabling proof of retrievability in cloud computing with resource-constrained devices 

      Li, Jin; Tan, xiao; Chen, Xiaofeng; Wong, Duncan; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Article
      Accés obert
      Cloud computing moves the application software and databases to the centralized large data centers, where the management of the data and services may not be fully trustworthy. In this work, we study the problem of ensuring ...

    • Optimisation problems and resolution methods in satellite scheduling and space-craft operation: a survey 

      Xhafa Xhafa, Fatos; Ip, Andrew W. H. (2021-09)
      Article
      Accés obert
      The fast development in the production of small, low-cost satellites is propelling an important increase in satellite mission planning and operations projects. Central to satellite mission planning is the resolution of ...

    • Optimization of giant component and number of covered users in Wireless Mesh Networks: a comparison study 

      Kolici, Vladi; Barolli, Leonard; Sakamoto, Shinji; Oda, Tetsuya; Xhafa Xhafa, Fatos; Uchida, Kazunori (2015)
      Text en actes de congrés
      Accés obert
      One of the key advantages of Wireless Mesh Networks (WMNs) is their importance for providing cost efficient broad band connectivity. There are issues for achieving the network connectivity and user coverage, which are ...

    • Optimization of task allocations in Cloud to Fog environment with application to Intelligent Transportation Systems 

      Xhafa Xhafa, Fatos; Aly, Alhassan; Juan, Angel A. (2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Fog and Edge computing are opening up new opportunities to implement novel features of mobility, edge intelligence and end-user support. The successful implementation and deployment of Fog layers, as part of Cloud-to-thi ...

    • Optimization of vehicular networks in smart cities: from agile optimization to learnheuristics and simheuristics 

      Peyman, Mohammad; Fluechter, Tristan; Panadero Martínez, Javier; Serrat Piè, Carles; Xhafa Xhafa, Fatos; Alejandro Juan, Angel (Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-02)
      Article
      Accés obert
      Vehicular ad hoc networks (VANETs) are a fundamental component of intelligent transportation systems in smart cities. With the support of open and real-time data, these networks of inter-connected vehicles constitute an ...

    • P2P data replication and trustworthiness for a JXTA-Overlay P2P system using fuzzy logic 

      Spaho, Evjola; Barolli, Leonard; Xhafa Xhafa, Fatos; Biberaj, A.; Shurdi, O. (2013-01)
      Article
      Accés restringit per política de l'editorial
      P2P systems are very important for future distributed systems and applications. In such systems, the computational burden of the system can be distributed to peer nodes of the system. Therefore, in decentralized systems ...

    • Parallel approximability of MAX NP problems 

      Serna Iglesias, María José; Xhafa Xhafa, Fatos (1995-01-01)
      Report de recerca
      Accés obert
      We study the relationship between the computationally defined class NCX of all optimization problems that are approximable within constant ratio in NC and syntactically defined classes MAXSNP and MAXNP. A simple observation ...

    • Parallel memetic algorithms for independent job scheduling in computational grids 

      Xhafa Xhafa, Fatos; Duran, Bernat (Springer, 2008)
      Capítol de llibre
      Accés obert
      In this chapter we present parallel implementations of Memetic Algorithms (MAs) for the problem of scheduling independent jobs in computational grids. The problem of scheduling in computational grids is known for its high ...

    • Parallel programming paradigms and frameworks in big data era 

      Dobre, Ciprian M.; Xhafa Xhafa, Fatos (2014-10-01)
      Article
      Accés obert
      With Cloud Computing emerging as a promising new approach for ad-hoc parallel data processing, major companies have started to integrate frameworks for parallel data processing in their product portfolio, making it easy ...

    • Parallel skeletons for Tabu search method 

      Blesa Aguilera, Maria Josep; Hernàndez, Lluis; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2001)
      Comunicació de congrés
      Accés obert
      We present two generic parallel skeletons for the tabu search method-a well known meta-heuristic for approximately solving combinatorial optimization problems. The first skeleton is based on independent runs while the ...

    • Parallel skeletons for tabu search method 

      Blesa Aguilera, Maria Josep; Hernàndez, Lluís; Xhafa Xhafa, Fatos (2000-12)
      Report de recerca
      Accés obert
      In this paper we present two parallel skeltons for Tabu Search method --a well known meta-heuristic designed for finding approximate solution of combinatorial optimization problems. Our parallel skeletons are designed ...

    • Parallel skeletons for tabu search method based on search strategies and neighborhood partition 

      Blesa Aguilera, Maria Josep; Hernàndez, Lluís; Xhafa Xhafa, Fatos (2001-05)
      Report de recerca
      Accés obert
      In this paper we present two parallel skeletons for Tabu Search method -- a well known meta-heuristic for approximately solving combinatorial optimization problems. Our parallel skeletons are designed and implemented using ...

    • Parameter tuning of JXTA-based P2P platforms 

      Xhafa Xhafa, Fatos; Arrizabalaga, Zorion; Misse Bertran, Jordi; Barolli, Leonard (2009)
      Text en actes de congrés
      Accés obert
      P2P technologies have appeared as disruptive technologies that have spawned large scale collaborative applications involving thousands or even millions of users world-wide. Undoubtedly, most successful applications of P2P ...