Ara es mostren els items 21-40 de 87

  • Averaged similarities generable by single attributes 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2015)
    Text en actes de congrés
    Accés obert
    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
    Accés obert
    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 ...
  • Comparison of different algorithms of approximation by extensional fuzzy subsets 

    Mattioli Aramburu, Gabriel; Recasens Ferrés, Jorge (Springer, 2013)
    Article
    Accés obert
    How to approximate an arbitrary fuzzy subset by an adequate extensional one is a key question within the theory of Extensional Fuzzy Subsets. In a recent paper by the authors [19] different methods were provided to find ...
  • Discretization of fuzzy transitive relations 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
  • Dualities and isomorphisms between indistinguishabilities and related concepts 

    Mattioli Aramburu, Gabriel; Recasens Ferrés, Jorge (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
  • Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations 

    Izquierdo Figarola, Jordi; Recasens Ferrés, Jorge; Fernández-Quintanilla, C; Gill, G (2003-09)
    Article
    Accés obert
    The effects of both barley and Lolium rigidum densities on weed growth and spike production and on crop yield were examined in five field experiments carried out in the Mediterranean drylands of Spain and Western Australia. ...
  • Eigenvectors and generators of fuzzy relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (-, 1992)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A new geometric approach to the study of the eigenvectors is provided. The T-eigenvectors of a T-indistinguishability operator are characterized as its generators in the sense of the representation theorem of L. Valverde ...
  • Estructura de las similitudes 

    González del Campo, Ramón; Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Center for Soft Computing, 2008)
    Text en actes de congrés
    Accés obert
    En este artículo se define formalmente el concepto de estructura de similaridad, se cuenta el número de estructuras de similaridades hasta dimensión 5, se propone una nomenclatura y un algoritmo que asigna una estructura ...
  • ET-Lipschitzian aggregation operators 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (-, 2007)
    Text en actes de congrés
    Accés obert
    Lipschitzian and kernel aggregation operators with respect to the natural Tindistinguishability operator ET and their powers are studied. A t-norm T is proved to be ET -lipschitzian, and is interpreted as a fuzzy point and ...
  • E-T-lipschitzian and E-T-kernel aggregation operators 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (2007-12)
    Article
    Accés restringit per política de l'editorial
    Lipschitzian and kernel aggregation operators with respect to natural T-indistinguishability operators ET and their powers are studied. A t-norm T is proved to be ET-lipschitzian, and is interpreted as a fuzzy point and a ...
  • Extensionality with respect to indistinguishability operators 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-04-01)
    Article
    Accés restringit per política de l'editorial
    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, ...
  • Finding close T-indistinguishability operators to a given proximity 

    Garmendia Salvador, Luis; Recasens Ferrés, Jorge (-, 2007)
    Text en actes de congrés
    Accés obert
    Two ways to approximate a proximity relation R (i.e. a reflexive and symmetric fuzzy relation) by a T-transitive one where T is a continuous archimedean t-norm are given. The first one aggregates the transitive closure R ...
  • Finitely valued indistinguishability operators 

    Mayor, Gaspar; Recasens Ferrés, Jorge (Springer Verlag, 2010)
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  • Finite-valued indistinguishability operators 

    Mayor, Gaspar; Recasens Ferrés, Jorge (2011-10)
    Article
    Accés restringit per política de l'editorial
    Fuzzy equality relations or indistinguishability operators generalize the concepts of crisp equality and equivalence relations in fuzzy systems where inaccuracy and uncertainty is dealt with. They generate fuzzy granularity ...
  • Fixed points and generators of fuzzy relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (1994-08)
    Article
    Accés restringit per política de l'editorial
    The fixed points of a T-indistinguishability operator are characterized as its generators in the sense of the Representation Theorem of Valverde. The geometric description of the set of fixed points of a reflexive and ...
  • Funciones de implicación borrosas basadas en potencias 

    Massenet, Sabastià; Recasens Ferrés, Jorge; Torrens, Joan (2016)
    Text en actes de congrés
    Accés obert
    La introducción de nuevas familias de funciones de implicación borrosas es una necesidad para poder elegir aquella más adecuada para una aplicación concreta. En esta línea, en este trabajo se introduce un nuevo tipo de ...
  • Fuzzy actions 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2017-01-01)
    Article
    Accés obert
    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 ...
  • Fuzzy Groups, Fuzzy Functions and Fuzzy Equivalence Relations 

    Demirci, M; Recasens Ferrés, Jorge (2004-06)
    Article
    Accés restringit per política de l'editorial
    To each fuzzy subgroup a fuzzy equivalence relation is associated and it is proved that a fuzzy subgroup is normal if and only if the operation of the group is compatible with its associated fuzzy equivalence relation. In ...
  • Fuzzy implication functions based on powers of continuous t-norms 

    Massanet, Sebastià; Recasens Ferrés, Jorge; Torrens, Joan (2017-04-01)
    Article
    Accés obert
    The modification (relaxation or intensification) of the antecedent or the consequent in a fuzzy “If, Then” conditional is an important asset for an expert in order to agree with it. The usual method to modify fuzzy ...
  • Fuzzy numbers and equality relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (IEEE pub., 1993)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A general approach to the concept of fuzzy number associated to a generalized equality on the real line is given. As a result, the use of triangular and trapezoidal fuzzy numbers, among other types, is justified and a ...