Exploració per tema "Fuzzy logic"

Ara es mostren els items 135-154 de 213

    • Maps and isometries between indistinguishability operators 

      Jacas Moral, Juan; Recasens Ferrés, Jorge (2002-02)
      Article
      Accés restringit per política de l'editorial
      In this paper, some geometric aspects of indistinguishability operators are studied by using the concept of morphism between them. Among all possible types of morphisms, the paper is focused on the following cases: Maps ...

    • Mathematical modeling to standardize times in assembly processes: application to four case studies 

      Colina, Eliezer; Peña, Mario; Morocho, Villie; Siguenza-Guzman, Lorena (OmniaScience, 2021-04)
      Article
      Accés obert
      Purpose: This paper proposes model-based standard times estimates using multiple linear regression, non-linear optimization, and fuzzy systems in four real cases of assembly lines. The work includes a description of the ...

    • Maximal fuzzy maps 

      Recasens Ferrés, Jorge (2009-01)
      Article
      Accés restringit per política de l'editorial
      Fuzzy maps are studied by stressing the idea that they are respectful with granularity when it is modeled by the existence of fuzzy equivalence relations (indistinguishability operators). The granules of the system are ...

    • Mobile robot visual navigation based on fuzzy logic and optical flow approaches 

      Nadour, Mohamed; Boumehraz, Mohamed; Cherroun, Lakhmissi; Puig Cayuela, Vicenç (2019-01-01)
      Article
      Accés obert
      This paper presents the design of mobile robot visual navigation system in indoor environment based on fuzzy logic controllers (FLC) and optical flow (OF) approach. The proposed control system contains two Takagi–Sugeno ...

    • Model predictive fuzzy control of a steam boiler 

      Blanco Baptista, Michael (Universitat Politècnica de Catalunya, 2016-09-05)
      Projecte Final de Màster Oficial
      Accés obert
      This thesis is devoted to apply a Model Predictive Fuzzy Controller (MPC and Takagi-Sugeno) to a specific Steam Boiler Plant. This is a very common problem in control. The considered plant is based on the descriptions ...

    • Modeling noise annoyance caused by air traffic using fuzzy logic 

      Sanchez Franco, Miriam (Universitat Politècnica de Catalunya, 2008-11-17)
      Projecte/Treball Final de Carrera
      Accés obert
      The main goal of this project is the study and modeling of the noise annoyance caused by air traffic by using the fuzzy logic theory. Like many other environmental problems, air traffic noise, continues to grow and has ...

    • Modelling a linguistic variable as a hierarchical family of partitions induced by an indistinguishability operator 

      Soto, De A R; Recasens Ferrés, Jorge (2001-08)
      Article
      Accés restringit per política de l'editorial
      This work shows a method to obtain a hierarchy of partitions on the universe [0,1] in such a way that each of them is compatible with a refinement of Lukasiewicz indistinguishability operator. The classes of the partition ...

    • Multi-layered reinforcement learning approach for radio resource management 

      Kevin, Collados; Gorricho Moreno, Juan Luis; Serrat Fernández, Juan; Hu, Zheng (Springer, 2014-02-07)
      Article
      Accés restringit per política de l'editorial
      In this paper we face the challenge of designing self-tuning systems governing the working parameters of base stations on a mobile network system to optimize the quality of service and the economic benefit of the operator. ...

    • Multi-stage genetic fuzzy systems based on the iterative rule learning approach 

      González Muñoz, Antonio; Herrera Triguero, Francisco (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1997)
      Article
      Accés obert
      Genetic algorithms (GAs) represent a class of adaptive search techniques inspired by natural evolution mechanisms. The search properties of GAs make them suitable to be used in machine learning processes and for developing ...

    • Multilayered reinforcement learning approach for radio resource management 

      Kevin, Collados; Gorricho Moreno, Juan Luis; Serrat Fernández, Juan; Hu, Zheng (Springer, 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper we face the challenge of designing self-tuning systems governing the working parameters of base stations on a mobile network system to optimize the quality of service and the economic benefit of the operator. ...

    • Normalizing possibility distributions using t-norms 

      Recasens Ferrés, Jorge; Lawry, J (2003-06)
      Article
      Accés restringit per política de l'editorial
      A new approach to normalizing fuzzy sets is introduced where it is assumed that the normalization method is compatible with a given t-norm. In this context it is proved that the most usual ways to normalize fuzzy subsets ...

    • On a conjecture concerning positive semi-definiteness 

      Recasens Ferrés, Jorge (2019-01-01)
      Article
      Accés obert
      In [7] a conjecture relating the positive definiteness of a similarity with its transitivity with respect to the Lukasiewicz t-norm is made. In its current form, the conjecture is not true but from a modified version ...

    • On a geometric combinatorial problem 

      Recasens Ferrés, Jorge (1998-09)
      Article
      Accés restringit per política de l'editorial
      The study of the betweenness relations defined by metrics leads to a geometric problem that yields an upper bound to Turán's number T(n,5,3).

    • On possibilistic and probabilistic approximations of unrestricted belief functions based on the concept of fuzzy T-preorder 

      Hernández, E; Recasens Ferrés, Jorge (2002-06)
      Article
      Accés restringit per política de l'editorial
      This paper presents a new method for approximating an unrestricted belief measure assuring that the "order" defined by the compatibility degree between evidence and the singletons set is preserved. Our approach, based on ...

    • On the degree of transitivity of a fuzzy relation 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2021-01-01)
      Article
      Accés obert
      Considering a family generated from a t-norm T, the degree of T-transitivity of a fuzzy relation R is revisited and proved to coincide with the greatest c for which R is -transitive. This fact gives rise to the study of ...

    • On the identity of fuzzy material conditionals 

      Trillas i Gay, Enric; Cubillo Villanueva, Susana; Rodríguez de Soto, Adolfo (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1994)
      Article
      Accés obert
      Given $\mu , \; \eta :X \rightarrow [0,1]$ we study when the equality $I_{\mu }^{T}=I_{\eta }^{T}$ holds, $T$ being a continuous t-norm, and $I_{\theta }^{T}$ the elemental preorder:\\ \[ I_{\theta }^{T}(y/x) = sup \{z\; ...

    • On the Induction of New Fuzzy Relations, New Fuzzy Operators and Their Aggregation 

      Carmona Cervelló, Neus; Elorza, Jorge; Recasens Ferrés, Jorge; Bragard, Jean (Springer, 2013)
      Article
      Accés obert
      In this paper we generate fuzzy relations and fuzzy operators using different kind of generators and we study the relationship between them. Firstly, we introduce a new fuzzy preorder induced by a fuzzy operator. We ...

    • On the relationship between fuzzy subgroups and indistinguishability operators 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-09-06)
      Article
      Accés obert
      Fuzzy subgroups are revisited considering their close relationship with indistinguishability operators (fuzzy equivalences) invariant under translations. Different ways to obtain new fuzzy subgroups from a given one are ...

    • On the relationship between positive semi-definite matrices and t-norms 

      Recasens Ferrés, Jorge (2021-01-01)
      Article
      Accés obert
      t-norms and t-conorms are the natural connectives “and” and “or” in fuzzy logic. The unit interval with a t-norm or a t-conorm is a special monoid and some submonoids like discrete t-norms and t-conorms have been proved ...

    • On the representation of local indistinguishability operators 

      Calvo Sánchez, Tomasa; Recasens Ferrés, Jorge (2021-05-01)
      Article
      Accés obert
      This paper studies local indistinguishability operators, i.e., symmetric and transitive fuzzy relations that do not need to be reflexive. This is an important generalization of global indistinguishability relations (fuzzy ...