Enviaments recents

  • A geographical heuristic routing protocol for VANETs 

    Urquiza Aguiar, Luis; Tripp Barba, Carolina; Aguilar Igartua, Mónica (2016-10-01)
    Article
    Accés obert
    Vehicular ad hoc networks (VANETs) leverage the communication system of Intelligent Transportation Systems (ITS). Recently, Delay-Tolerant Network (DTN) routing protocols have increased their popularity among the research ...
  • Scalability of broadcast performance in wireless network-on-chip 

    Abadal Cavallé, Sergi; Mestres Sugrañes, Albert; Nemirovsky, Mario; Lee, Heekwan; González Colás, Antonio María; Alarcón Cot, Eduardo José; Cabellos Aparicio, Alberto (2016-12-01)
    Article
    Accés obert
    Networks-on-Chip (NoCs) are currently the paradigm of choice to interconnect the cores of a chip multiprocessor. However, conventional NoCs may not suffice to fulfill the on-chip communication requirements of processors ...
  • Filtering the time sequences of spectral parameters for speech recognition 

    Nadeu Camprubí, Climent; Paches, Pau; Biing-Hwang, Juang (1997-09)
    Article
    Accés restringit per política de l'editorial
    In automatic speech recognition, the signal is usually represented by a set of time sequences of spectral parameters (TSSPs) that model the temporal evolution of the spectral envelope frame-to-frame. Those sequences are ...
  • Self-splitting of beams into spatial solitons in planar waveguides made of quadratic nonlinear media 

    Perez, J; Torner Sabata, Lluís (1997-09)
    Article
    Accés restringit per política de l'editorial
    The propagation of intense light beams in planar optical waveguides made of quadratic nonlinear media under conditions for second-harmonic generation is investigated. It is shown numerically that under appropriate conditions, ...
  • Cross-coupled doa trackers 

    Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Kirlin, R L (1997-10)
    Article
    Accés obert
    A new robust, low complexity algorithm for multiuser tracking is proposed, modifying the two-stage parallel architecture of the estimate-maximize (EM) algorithm. The algorithm copes with spatially colored noise, large ...
  • Integral equation mei applied to three-dimensional arbitrary surfaces 

    Rius Casals, Juan Manuel; Parrón Granados, Josep; Úbeda Farré, Eduard; Mosig, J R (Institution of Electrical Engineers, 1997-11)
    Article
    Accés obert
    The authors present a new formulation of the integral equation of the measured equation of invariance (MEI) as a confined field integral equation discretised by the method of moments, in which the use of numerically derived ...
  • Soliton evolution in quasi-phase-matched second-harmonic generation 

    Torner Sabata, Lluís; Stegeman, G I (1997-11)
    Article
    Accés restringit per política de l'editorial
    We investigate the formation and evolution of spatial solitons with light beams propagating in quadratic nonlinear media under conditions for second-harmonic generation in quasi-phase-matched samples. We study the properties ...
  • SHERPA: Towards a methodological acqusition of ERP solutions 

    Sistach Vallve, Francisco; Fernández, Luís Felipe; Pastor Collado, Juan Antonio (1998-12)
    Report de recerca
    Accés obert
    In the IS area, methods have been focused mostly on IS development and less on its acquisition. In this last issue, we can find simple methods which give generic advises or series of steps on the acquisition of software, ...
  • Asymmetrical splitting of higher-order optical solitons induced by quintic nonlinearity 

    Artigas García, David; Torner Sabata, Lluís; Pérez Torres, Juan; Akhmediev, Juan P Torres I Nail N (1997-11)
    Article
    Accés restringit per política de l'editorial
    We address the effect of quintic nonlinearities in the propagation of optical solitons in cubic nonlinear media. Our focus is on the decay of higher-order solitons in the presence of self-defocusing quintic perturbations. ...
  • Stochastic vector quantization of images 

    Torres Urgell, Lluís; Casas Pla, Josep Ramon; Arias, E (1997-11)
    Article
    Accés restringit per política de l'editorial
    One of the most important steps in the vector quantization of images is the design of the codebook. The codebook is generally designed using the LBG algorithm, that is in essence a clustering algorithm which uses a large ...

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