Ara es mostren els items 1-10 de 10

    • A lattice representation of relations, multivalued dependencies and Armstrong relations 

      Baixeries i Juvillà, Jaume; Balcázar Navarro, José Luis (2005)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We present a lattice-base formalism to relate, in a novel way, different representation methods for relational data. Specifically, relations given extensionally by tuples, multivalued dependencies, and Armstrong relations ...
    • A simplified new multigrid algorithm of lattice Boltzmann method for steady states 

      An, Bo; Bergadà Granyó, Josep Maria; Sang, W.M (2023-02-01)
      Article
      Accés restringit per política de l'editorial
      In the present paper, a new strategy of multigrid method is introduced to accelerate the convergence speed of numerical simulations via lattice Boltzmann method. Based on the popular V-cycle multigrid algorithm, a simplified ...
    • Approximation and decomposition in lattices of clutters 

      Martí Farré, Jaume; Mier Vinué, Anna de (2023-08-01)
      Article
      Accés obert
      A clutter on O is a family of subsets of O that are incomparable under inclusion. Given a collection S of clutters on O and another clutter ¿ on O, we study the problem of approximating and decomposing ¿ in terms of the ...
    • Characterization and Armstrong relations for Degenerated Multivalued Dependencies using Formal Concept Analysis 

      Baixeries i Juvillà, Jaume; Balcázar Navarro, José Luis (Springer, 2005)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Functional dependencies, a notion originated in Relational Database Theory, are known to admit interesting characterizations in terms of Formal Concept Analysis. In database terms, two successive, natural extensions of ...
    • Line tracking performance of a least squares adaptive lattice algorithm 

      Masgrau Gómez, Enrique José; Lagunas Hernandez, Miguel A.; Mariño Acebal, José Bernardo (1983)
      Text en actes de congrés
      Accés obert
      The work shows the performance of an algorithm for adaptive lattice structures in line tracking. The algorithm introduces some modifications in the classical LMS procedure, which theoretical background can be viewed in ...
    • Satins, lattices, and extended Euclid's algorithm 

      Brunat Blay, Josep M.; Lario Loyo, Joan Carles (2021-01-01)
      Article
      Accés obert
      Motivated by the design of satins with draft of period m and step a, we draw our attention to the lattices L(m,a)=¿(1,a),(0,m)¿ where 1=a<m are integers with gcd(m,a)=1. We show that the extended Euclid's algorithm applied ...
    • Sensor placement for fault diagnosis performance maximization under budgetary constraints 

      Sarrate Estruch, Ramon; Nejjari Akhi-Elarab, Fatiha; Rosich Oliva, Albert (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The success of any diagnosis strategy critically depends on the sensors measuring process variables. This paper presents a strategy based on diagnosability maximization for optimally locating sensors in distribution networks. ...
    • Teoremes de representació per a àlgebres de Boole finites i retícles distributius finits 

      Massó Cuscó, Jordi (Universitat Politècnica de Catalunya, 2019-09)
      Treball Final de Grau
      Accés obert
      Un dels problemes centrals de les matemàtiques és el de la classificació. Per a cada tipus d objecte, tenim la corresponent noció d isomorfisme i ens interessa saber sota quines circumstàncies dos objectes d aquest tipus ...
    • Uncertainty analysis in lattice physics calculations: application of the NRG's TALYS evaluated data to a case of burnup 

      Ferragut Ferretjans, Francisco (Universitat Politècnica de Catalunya / Institut National Polytechnique de Grenoble, 2011)
      Projecte Final de Màster Oficial
      Accés obert
      TENDL evaluate files have been processed with NJOY and different libraries have been created and processed by the deterministic code DRAGON. The aim of this process is obtain hundreds of burnups calculation that has been ...
    • Unified characterization of symmetric dependencies with lattices 

      Baixeries i Juvillà, Jaume; Balcázar Navarro, José Luis (2006)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Symmetric dependencies, or MultiValued Dependencies-like, are those dependencies that follow the deduction rules of MultiValued Dependencies (MVD’s). These are MVD-clauses, Degenerate MultiValued Dependencies (DMVD’s), and ...