Now showing items 1-20 of 43

    • A Decomposition Theorem for T-Indistinguishability Operators : the Continuous Strict Archimedean Case 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2012)
      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 ...
    • 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 ...
    • 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
    • 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
    • Apunts de Matemàtiques II 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2013)
      Image
      Open Access
    • Apunts i exercicis de Matemàtiques II 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2013)
      Lecture notes / Problem statement, exercise
      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
    • Exercicis 

      Congost Iglesias, M. Assumpta; Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2008)
      Problem statement, exercise
      Open Access
    • 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 ...
    • G-shells:flat collapsible geodesic mechanisms for gridshells 

      Soriano Botella, Enrique; Sastre Sastre, Ramon; Boixader Ibáñez, Dionís (International Centre for Numerical Methods in Engineering (CIMNE), 2019)
      Conference lecture
      Open Access
      We present G-shells, a new strategy for deployable elastic gridshells developed from an initially flat and compact geodesic mechanism. The one-degree of freedom mechanism evolves from its initially flat state into a geodesic ...
    • 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 ...