Envíos recientes

  • Application of two different methods for extending lattice-valued restricted equivalence functions used for constructing similarity measures on L-fuzzy sets 

    Palmeira, Eduardo S.; Bedregal, Benjamin; Bustince Sola, Humberto Upna; Paternain Dallo, Daniel Upna; Miguel Turullols, Laura de Upna (Elsevier, 2018)   Artículo / Artikulua
    Based on previous investigations, we have proposed two different methods to extend lattice-valued fuzzy connectives (t-norms, t-conorms, negations and implications) and other related operators, considering a generalized ...
  • Some characterizations of lattice OWA operators 

    Miguel Turullols, Laura de Upna; Paternain Dallo, Daniel Upna; Lizasoain Iriso, María Inmaculada Upna; Ochoa Lezaun, Gustavo Upna; Bustince Sola, Humberto Upna (World Scientific Publishing Company, 2017)   Artículo / Artikulua
    Ordered Weighted Averaging (OWA) operators are a family of aggregation which fusion data. If the data are real numbers, then OWA operators can be characterized either as an special kind of Choquet integral or simply as ...
  • Binary relations coming from solutions of functional equations: orderings and fuzzy subsets 

    Campión Arrastia, María Jesús Upna; Miguel Turullols, Laura de Upna; García Catalán, Olga Raquel Upna; Induráin Eraso, Esteban Upna; Abrísqueta Usaola, Francisco Javier Upna (World Scientific Publishing Company, 2017)   Artículo / Artikulua
    We analyze the main properties of binary relations, defined o n a nonempty set, that arise in a natural way when dealing with real-valued functions that satisfy certain classical functional equations on two variables. We ...
  • An algorithm for group decision making using n -dimensional fuzzy sets, admissible orders and OWA operators 

    Miguel Turullols, Laura de Upna; Sesma Sara, Mikel Upna; Elkano Ilintxeta, Mikel Upna; Asiain Ollo, María José Upna; Bustince Sola, Humberto Upna (Elsevier, 2017)   Artículo / Artikulua
    In this paper we propose an algorithm to solve group decision making problems using n -dimensional fuzzy sets, namely, sets in which the membership degree of each element to the set is given by an in- creasing tuple of n ...
  • Pointwise aggregation of maps: its structural functional equation and some applications to social choice theory 

    Miguel Turullols, Laura de Upna; Campión Arrastia, María Jesús Upna; Candeal, Juan Carlos; Induráin Eraso, Esteban Upna; Paternain Dallo, Daniel Upna (Elsevier, 2017)   Artículo / Artikulua
    We study a structural functional equation that is directly related to the pointwise aggregation of a finite number of maps from a given nonempty set into another. First we establish links between pointwise aggregation and ...
  • Type-2 fuzzy entropy-sets 

    Miguel Turullols, Laura de Upna; Santos, Helida; Sesma Sara, Mikel Upna; Bedregal, Benjamin; Jurío Munárriz, Aránzazu Upna; Bustince Sola, Humberto Upna (IEEE, 2017)   Artículo / Artikulua  OpenAccess
    The final goal of this study is to adapt the concept of fuzzy entropy of De Luca and Termini to deal with Type-2 Fuzzy Sets. We denote this concept Type-2 Fuzzy Entropy-Set. However, the construction of the notion of ...
  • Some properties of implications via aggregation functions and overlap functions 

    Zapata, Hugo; Bustince Sola, Humberto Upna; Miguel Turullols, Laura de Upna; Guerra, Carlos Upna (Taylor & Francis, 2014)   Artículo / Artikulua  OpenAccess
    In this work, using the identification between implication operators and aggregation functions, we study the implication operators that are recovered from overlap functions. In particular, we focus in which properties ...
  • Adjusting fuzzy automata for string similarity measuring 

    Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; González de Mendívil Moreno, José Ramón Upna; Garitagoitia Padrones, José Ramón Upna; Fariña Figueredo, Federico Upna (EUSFLAT, 2001)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    In this paper, we introduce a fuzzy automaton for computing the similarity between pairs of strings and a genetic method for adjusting its parameters. The fuzzy automaton models the edit operations needed to transform ...
  • On fuzzy orderings of crisp and fuzzy intervals 

    Fuentes González, Ramón Upna; Burillo López, Pedro Upna; Mayor, Gaspar (EUSFLAT, 2001)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    First, fuzzy membership functions for the assertion '[x,y] is a positive interval' are proposed and characterized via non-decreasing real maps. Last, using those functions together with the intervaldifference and the ...
  • Overtaker binary relations on complete completely distributive lattices related to the level sets of the L-fuzzy sets 

    Núñez, A.; Burillo López, Pedro Upna; Fuentes González, Ramón Upna; González, L. (Universitat Politècnica de Catalunya, 1994)   Artículo / Artikulua  OpenAccess
    The class of overtaker binary relations associated with the order in a lattice is defined and used to generalize the representations of L-fuzzy sets by means of level sets or fuzzy points.
  • On completeness and direction in fuzzy relational systems 

    Burillo López, Pedro Upna; Fuentes González, Ramón Upna; González, L. (Universitat Politècnica de Catalunya, 1998)   Artículo / Artikulua  OpenAccess
    The concepts of bounded subset, complete subset and directed subset, which are well known in the context of partially ordered sets (X, ≤), are extended in order to become applicable, with coherence, in fuzzy relational ...
  • Parametric families of fuzzy consequence operators 

    Elorza Barbajero, Jorge Upna; Burillo López, Pedro Upna (Universitat Politècnica de Catalunya, 2004)   Artículo / Artikulua  OpenAccess
    In a previous paper we explored the notion of coherent fuzzy consequence operator. Since we did not know of any example in the literature of non-coherent fuzzy consequence operator, we also showed several families of such ...
  • On contrast intensification operators and fuzzy equality relations 

    Burillo López, Pedro Upna; Fuentes González, Ramón Upna; González, L.; Marín Martínez, Ángel Upna (Universitat Politècnica de Catalunya, 2000)   Artículo / Artikulua  OpenAccess
    The class of contrast intensification operators is formally defined and its lattice structure studied. The effect of these operators in the referential classification derived from special kinds of fuzzy relations is also ...
  • Intuitionistic fuzzy relations (Part I) 

    Burillo López, Pedro Upna; Bustince Sola, Humberto Upna (Universitat Politècnica de Catalunya, 1995)   Artículo / Artikulua  OpenAccess
    This paper introduces the concept of intuitionistic fuzzy relation. We also study the choice of t-norms and t-conorms which must be done in order that the composition of intuitionistic fuzzy relations fulfills the largest ...
  • Intuitionistic fuzzy relations (Part II). Effect of Atanassov's operators on the properties of the intuitionistic fuzzy relations 

    Burillo López, Pedro Upna; Bustince Sola, Humberto Upna (Universitat Politècnica de Catalunya, 1995)   Artículo / Artikulua  OpenAccess
    In this paper we study the effect of Atanassov's operator on the properties of properties reflexive, symmetric, antisymmetric, perfect antisymmetric and transitive intuitionistic fuzzy relations. We finish the paper analysing ...
  • Fuzzy morphological operators in image processing 

    Burillo López, Pedro Upna; Frago Paños, Noé Natalio Upna; Fuentes González, Ramón Upna (Universitat Politècnica de Catalunya, 2003)   Artículo / Artikulua  OpenAccess
    First of all, in this paper we propose a family of fuzzy implication operators, which the generalised Luckasiewicz´s one, and to analyse the impacts of Smets and Magrez properties on these operators. The result of this ...
  • Generation of fuzzy mathematical morphologies 

    Burillo López, Pedro Upna; Frago Paños, Noé Natalio Upna; Fuentes González, Ramón Upna (Universitat Politècnica de Catalunya, 2001)   Artículo / Artikulua  OpenAccess
    Fuzzy Mathematical Morphology aims to extend the binary morphological operators to grey-level images. In order to define the basic morphological operations fuzzy erosion, dilation, opening and closing, we introduce ...
  • New trends on the numerical representability of semiordered structures 

    Abrísqueta Usaola, Francisco Javier Upna; Campión Arrastia, María Jesús Upna; García Catalán, Olga Raquel Upna; Miguel Velasco, Juan Ramón de Upna; Estevan Muguerza, Asier Upna; Induráin Eraso, Esteban Upna; Zudaire Sarobe, Margarita Upna; Agud, L.; Candeal, Juan Carlos; Díaz, S.; Martinetti, D.; Montes, S.; Gutiérrez García, J. (EUSFLAT, 2012)   Artículo / Artikulua  OpenAccess
    We introduce a survey, including the historical background, on di erent techniques that have recently been issued in the search for a characterization of the representability of semiordered structures, in the sense of ...
  • Extensions of fuzzy sets in image processing: an overview 

    Pagola Barrio, Miguel Upna; Barrenechea Tartas, Edurne Upna; Bustince Sola, Humberto Upna; Fernández Fernández, Francisco Javier Upna; Galar Idoate, Mikel Upna; Jurío Munárriz, Aránzazu Upna; López Molina, Carlos Upna; Paternain Dallo, Daniel Upna; Sanz Delgado, José Antonio Upna; Couto, P.; Melo Pinto, P. (EUSFLAT, 2011)   Artículo / Artikulua  OpenAccess
    This work presents a valuable review for the interested reader of the recent Works using extensions of fuzzy sets in image processing. The chapter is divided as follows: first we recall the basics of the extensions of fuzzy ...
  • Posibles nuevas vías de investigación en teoría de la comunicación a través de modelos matemáticos: análisis topológico 

    Gracia Sanz, Jesús; Burillo López, Pedro Upna (Centro de Investigaciones Sociológicas, 1978)   Artículo / Artikulua  OpenAccess
    Uno de los pocos puntos en los que los metodólogos de las ciencias sociales están de acuerdo es el divorcio existente entre trabajo teórico y trabajo metodológico en las prácticas sociales concretas. Por otro lado, para ...

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