Ara es mostren els items 1-20 de 87

  • Acciones de grupos borrosas 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2016)
    Text en actes de congrés
    Accés obert
    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)
    Text en actes de congrés
    Accés obert
  • Aggregating fuzzy subgroups and T-vague groups 

    Boixader Ibáñez, Dionís; Mayor, Gaspar; Recasens Ferrés, Jorge (Springer, 2018-01-01)
    Article
    Accés obert
    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 T-equivalence relations 

    Mayor, Gaspar; Recasens Ferrés, Jorge (2016)
    Text en actes de congrés
    Accés obert
    This contribution deals with the problem of aggregating Tequivalence relations, in the sense that we are looking for functions that preserve reflexivity, symmetry, and transitivity with respect to a given t-norm T. We ...
  • Aggregation of T-transitive Relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (Wiley InterScience, 2003-12)
    Article
    Accés restringit per política de l'editorial
    This article studies the aggregation of transitive fuzzy relations. We first find operators that preserve transitivity and then extend the results to aggregating operators. As special cases, means and some kind of suitable ...
  • Aggregation operators and lipschitzian conditions 

    Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Lipschitzian aggregation operators with respect to the natural T - indistin- guishability operator Et and their powers, and with respect to the residuation ! T with respect to a t-norm T and its powers are studied. A ...
  • Aggregation operators and quadric hypersurfaces 

    Recasens Ferrés, Jorge (Springer, 2013)
    Article
    Accés obert
    Aggregation operators that are quadric hypersurfaces are studied. The interest lays in the fact that the most popular aggregation operators are indeed quadric hypersurfaces.
  • Aggregation operators and ruled surfaces 

    Recasens Ferrés, Jorge (IOS Press, 2008)
    Text en actes de congrés
    Accés obert
  • Aggregation operators and the Lipschitzian condition 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (IEEE Comp. Int. Soc., 2007)
    Text en actes de congrés
    Accés obert
    Lipschitzian and kernel aggregation operators with respect to the natural T-indistinguishability operator ET and their powers are studied. A t-norm T is proved to be ETLipschitzian, and is interpreted as a fuzzy point and ...
  • Aggregation Operators Based on Indistinguishability Operators 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (Wiley InterScience, 2006-08)
    Article
    Accés restringit per política de l'editorial
    This article gives a new approach to aggregating assuming that there is an indistinguishability operator or similarity defined on the universe of discourse. The very simple idea is that when we want to aggregate two values ...
  • A map characterizing the fuzzy points and columns of a T-indistinguishability operator 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2005-10)
    Article
    Accés obert
    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 ...
  • A model for CAGD using fuzzy logic 

    Jacas Moral, Juan; Monreal Pujadas, Amadeo; Recasens Ferrés, Jorge (1997-01)
    Article
    Accés restringit per política de l'editorial
    This paper presents a first approach to a system based on fuzzy logic for the design of curves and surfaces in the context of computer aided geometric design. Bézier curves and surfaces can be seen as particular cases of ...
  • An algorithm to compute the transitive closure, a transitive approximation and a transitive opening of a fuzzy proximity 

    Garmendia Salvador, Luis; González del Campo, Ramón; López, Victoria; Recasens Ferrés, Jorge (2009-11)
    Article
    Accés obert
    A method to compute the transitive closure, a transitive opening and a transitive approximation of a reflexive and symmetric fuzzy relation is given. Other previous methods in literature compute just the transitive closure, ...
  • An algorithm to compute the transitive closure, a transitive approximation and a transitive opening of a proximity 

    Garmendia Salvador, Luis; González, Ramón; Recasens Ferrés, Jorge (2008)
    Text en actes de congrés
    Accés obert
    A method to get the transitive closure, a transitive opening and a transitive approximation of a reflexive and symmetric fuzzy relation is presented. The method builds at the same time a binary partition tree for the output ...
  • Approximate fuzzy preorders and equivalences 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2009)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    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 arbitrary fuzzy subsets by extensional ones 

    Mattioli Aramburu, Gabriel; Recasens Ferrés, Jorge (2015-06-01)
    Article
    Accés obert
    An interesting problem within the theory of indistinguishability operators is how to approximate an arbitrary fuzzy subset by a similar extensional one. In this paper, we aim to solve this question and provide three methods ...
  • Approximating fuzzy preorders and equivalences. A similarity based approach 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IEEE Computer Society Publications, 2010)
    Text en actes de congrés
    Accés obert
  • Approximating proximities by similarities 

    Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Univ. Malaga, 2008)
    Text en actes de congrés
    Accés obert
    In this paper an algorithm to find a similarity close to a proximity or tolerance relation R is given. The obtained similarity is closer to R than its transitive closure or any transitive opening of R.
  • Aproximación de Proximidades por Similitudes 

    Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Center for Soft Computing, 2008)
    Text en actes de congrés
    Accés obert
    En este trabajo se presenta un algoritmo para hallar una relaci´on de similitud próxima a una relación de proximidad (i.e.: una relación de tolerancia) R dada. La relación de similitud obtenida es más próxima a R que su ...
  • A reformulation of entropy in the presence of indistinguishability operators 

    Recasens Ferrés, Jorge; Hernández, E (2002-06)
    Article
    Accés restringit per política de l'editorial
    This paper deals with the measurement of entropy when an indistinguishability relation on the set of events has been defined. Our approach states that entropy could be measured in terms of the observed distinguishability ...