Now showing items 1-20 of 38

  • Acciones de grupos borrosas 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2016)
    Conference report
    Open Access
    Este trabajo generaliza (fuzzifica) las acciones de un grupo sobre un conjunto para tratar situaciones donde hay imprecisión e incertidumbre. Las acciones borrosas pueden tratar la granularidad de un conjunto o incluso ...
  • A Decomposition Theorem for T-Indistinguishability Operators : the Continuous Strict Archimedean Case 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2012)
    Conference report
    Open Access
  • Aggregating fuzzy subgroups and T-vague groups 

    Boixader Ibáñez, Dionís; Mayor, Gaspar; Recasens Ferrés, Jorge (Springer, 2018-01-01)
    Article
    Open Access
    Fuzzy subgroups and T-vague groups are interesting fuzzy algebraic structures that have been widely studied. While fuzzy subgroups fuzzify the concept of crisp subgroup, T-vague groups can be identified with quotient groups ...
  • Aggregating Fuzzy Subgroups and T-vague subgroups 

    Boixader Ibáñez, Dionís; Mayor, Gaspar; Recasens Ferrés, Jorge (Springer, 2017)
    Conference report
    Open Access
  • A map characterizing the fuzzy points and columns of a T-indistinguishability operator 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2005-10)
    Article
    Open Access
    A new map (ΛE) between fuzzy subsets of a universe X endowed with a T-indistinguishability operator E is introduced. The main feature of ΛE is that it has the columns of E as fixed points, and thus it provides us with a ...
  • Approximate fuzzy preorders and equivalences 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2009)
    Conference report
    Restricted access - publisher's policy
    Although Fuzzy Preorders and Fuzzy Equivalences are well established types of fuzzy relations, they are defined in terms of properties to be fulfilled in a crisp way. In this paper we relax those requirements by making ...
  • Approximating fuzzy preorders and equivalences. A similarity based approach 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IEEE Computer Society Publications, 2010)
    Conference report
    Open Access
  • Averaged similarities generable by single attributes 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2015)
    Conference report
    Open Access
    In a theoretical setting, the Representation Theorem is used to generate T-indistinguishability operators (fuzzy similarity relations) from a given set of fuzzy criteria. In applied domains, though, other ways of generation ...
  • Characterization of unidimensional averaged similarities 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2017-09-01)
    Article
    Open Access
    A T-indistinguishability operator (or fuzzy similarity relation) E is called unidimensional when it may be obtained from one single fuzzy subset (or fuzzy criterion). In this paper, we study when a T-indistinguishability ...
  • Contribució a l'estudi dels morfismes entre operadors d'indistingibilitat. Aplicació al raonament aproximat 

    Boixader Ibáñez, Dionís (Universitat Politècnica de Catalunya, 1997-07-01)
    Doctoral thesis
    Open Access
    Aquesta memòria s'ha escrit amb l'ànim d'exposar els punts de vista i els resultats nous que l'autor ha pogut obtenir. No s'hi troba, per tant, una descripció detallada de tots els temes que conformen la teoria dels operadors ...
  • Discretization of fuzzy transitive relations 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2011)
    Conference report
    Restricted access - publisher's policy
  • Experiencias de lenguaje visual e interacción gráfica para soporte al aprendizaje 

    Boixader Ibáñez, Dionís; Font Comas, Joan; Gutiérrez Febles, Borja; Santana Roma, Galdric (Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Arquitectura del Vallès, 2006-09)
    Article
    Open Access
    Esta comunicación describe una de las líneas de trabajo que se vienen desarrollando actualmente en el centro CAIRAT de la E.T.S.A.V. (UPC). Ésta consiste en la elaboración de material docente de soporte destinado a las ...
  • Extensionality based approximate reasoning 

    Boixader Ibáñez, Dionís; Jacas Moral, Juan (1998-06)
    Article
    Restricted access - publisher's policy
    The aim of this paper is to analyze Approximate Reasoning (AR) through extensionality with respect to the natural T-indistinguishability operator, by considering the indistinguishability level between fuzzy sets as a formal ...
  • Extensionality with respect to indistinguishability operators 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-04-01)
    Article
    Open Access
    Extensionality is explored form different points of view. Extensional fuzzy subsets from a fuzzy equivalence relation E are considered as observable subsets with respect to the granularity generated by E. Interestingly, ...
  • Fuzzy actions 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2017-01-01)
    Article
    Open Access
    This paper generalizes (fuzzifies) actions of a monoid or group on a set to deal with situations where imprecision and uncertainty are present. Fuzzy actions can handle the granularity of a set or even create it by defining ...
  • Generation and Characterization of Fuzzy T-preorders 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2015-05-28)
    Article
    Open Access
    This article studies T-preorders that can be generated in a natural way by a single fuzzy subset. These T-preorders are called one-dimensional and are of great importance, because every T-preorder can be generated by ...
  • Indistinguishability operators with respect to different t-norms 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2012-04)
    Article
    Restricted access - publisher's policy
    An isomorphism f between two continuous Archimedean t-norms T and T′ transforms a T-indistinguishability operator E into a T′-indistinguishability operator f ∘ E and many interesting properties of E are transfered to f ∘ ...
  • Introducing Strong T-transitivity in Approximate Fuzzy Preorders and Equivalences 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IEEE Computer Society Publications, 2010)
    Conference report
    Restricted access - publisher's policy
  • Logical methods in artificial intelligence applications 

    Armengol Voltas, Eva; Boixader Ibáñez, Dionís; Grimado, Francisco (2017-09-01)
    Article
    Open Access
  • One-dimensional T-preorders 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IOS Press, 2014)
    Conference report
    Open Access
    This paper studies T-preorders by using their Representation Theorem that states that every T-preorder on a set X can be generated in a natural way by a family of fuzzy subsets of X. Especial emphasis is made on the study ...