2000, Vol. VII, Núm. 2-3

 

First EUSFLAT Conference and 9th. Spanish Congress on Fuzzy Logic & Technology. 1999, Palma de Mallorca.

Sumari

  • Fuzzy termination criteria in Knapsack problem algorithms 

    Verdegay, José Luis; Vergara-Moreno, Edmundo (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Fuzzy rule based termination criteria are introduced in two conventional and exact algorithms solving Knapsack Problems. As a consequence two new solution algorithms are obtained. These algorithms are heuristic ones with ...

  • Denotational semantics of languages with fuzzy data 

    Sánchez Álvarez, Daniel; Gómez Skarmeta, Antonio F. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    The denotational semantics of a programming language which manages fuzzy data is presented. The introduction of blocks poses problems regarding transmission, both for the degree at which the work is carried out and for ...

  • On the stability of T-S fuzzy control for non-linear systems 

    Doulgeri, Zoe; Theocharis, J. B. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    This work concerns the stability analysis of a non-linear system controlled by a fuzzy T-S control law. It is shown that the closed loop system is in general expressed by a T-S fuzzy system composed of rules with affine ...

  • Stock price forecasting: autoregressive modelling and fuzzy neural network 

    Marcek, Dusan (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Most models for the time series of stock prices have centered on autoregressive (AR) processes. Traditionaly, fundamantal Box-Jenkins analysis [3] have been the mainstream methodology used to develop time series models. ...

  • A survey of methods to evaluate quantified sentences 

    Delgado Calvo-Flores, Miguel; Sánchez Fernández, Daniel; Serrano Chica, José María; Vila Miranda, María Amparo (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    The evaluation of quantified sentences is used to solve several problems. Most of the methods proposed in the literature are not satisfactory because they do not verify some intuitive properties. In this paper we propose ...

  • A defuzzification based new algorithm for the design of Mamdani-type fuzzy controllers 

    Saade, J.J. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    This paper presents a new learning algorithm for the design of Mamdani-type or fully-linguistic fuzzy controllers based on available input-output data. It relies on the use of a previously introduced parametrized defuzzification ...

  • Solving a possibilistic linear program through compromise programming 

    Jiménez López, Mariano; Rodríguez Uría, Ma. Victoria; Arenas Parra, Mar; Bilbao Terol, Amelia (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    In this paper we propose a method to solve a linear programming problem involving fuzzy parameters whose possibility distributions are given by fuzzy numbers. To address the above problem we have used a preference ...

  • A methodology for constructing fuzzy rule based classification systems 

    Fernández Garrido, José María; Requena Ramos, Ignacio (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    In this paper, a methodology to obtain a set of fuzzy rules for classification systems is presented. The system is represented in a layered fuzzy network, in which the links from input to hidden nodes represents the ...

  • On defining multiple-valued logics for knowledge-based systems communication 

    Reyes, José Antonio; Puyol-Gruart, Josep; Esteva Massaguer, Francesc (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Multiple-valued logics are useful for dealing with uncertainty and imprecision in Knowledge-Based Systems. Different problems can require different logics. Then we need mechanisms to translate the information exchanged ...

  • A language for expressing fuzzy temporal rules 

    Cariñena Amigo, Purificación; Bugarín Diz, Alberto José; Mucientes, Manuel; Barro Ameneiro, D. Senén (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    This paper deals with the formal description of what we call Fuzzy Temporal Propositions: propositions with explicitly expressed information of a temporal type. The set of syntactic rules that make a grammar up for defining ...

  • The logistic decision making in management accounting with genetic algoritms and fuzzy sets 

    López González, Enrique; Rodríguez-Fernández, M. Ángel; Mendaña Cuervo, Cristina (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    The logistics problems in business environments deal with assignation from a number of sources to a number of destinations. Each source offers amounts of goods, while each destination demands quantities of these goods. The ...

  • The application of generalized constraints to object-oriented database models 

    Tré, Guy de; Caluwe, Rita de (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    A formal framework for a generalised object-oriented database model is presented, which is able to cope with fuzzy and uncertain information. This model is obtained as a generalisation of a crisp object-oriented database ...

  • Fuzzy path tracking and position estimation of autonomous vehicles using differential GPS 

    Rodríguez Castaño, Ángel; Heredia Benot, José Guillermo; Ollero Baturone, Aníbal (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    This paper presents an autonomous vehicle position estimation system based on GPS, that uses a fuzzy sensor fusion technique. A fuzzy path tracking algorithm is also proposed. Both systems have been implemented in the ...

  • First applications of the Orbex coprocessor: control of unmanned vehicles 

    García Rosa, Ricardo; Pedro Lucio, Teresa de (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    The ORBEX coprocessor has been designed to execute the typical fuzzy operations of a system based on fuzzy rules. The first real application has been fuzzy controllers for electric cars. The values of the input variables, ...

  • Using genetic feature selection for optimizing user profiles 

    Larsen, Henrik Legind; Marín Ruíz, Nicolás; Martín Bautista, Maria José; Vila Miranda, María Amparo (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Most of the techniques used in text classification are determined by the occurrences of the words (terms) appearing in the documents, combined with the user feedback over the documents retrieved. However, in our model, ...

  • Fuzzy adpatation for information acces to digital libraries 

    Fernández Llamas, Camino; Aedo, Ignacio; Díaz, Paloma; Matellán Olivera, Vicente (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Different models have been proposed to build systems that adapt to the user reducing the complexity in the information browsing process, saving user time and offering personalised interfaces. The work described ...

  • Deformed fuzzy automata for the text error correction problem 

    Echanobe Arias, Francisco Javier; Garitagoitia Padrones, José Ramón; González de Mendívil, José Ramón; Astrain Escola, José Javier (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    A fuzzy method for the text error correction problem is introduced. The method is able to handle insert, delete and substitution errors. Moreover, it uses the measurement level output that an Isolated Character Classifier ...

  • A GA-P algorithm to automatically formulate extended Boolean queries for a fuzzy information retrieval system 

    Cordón García, Oscar; Moya Anegón, Félix de; Zarco Fernández, Carmen (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Although the fuzzy retrieval model constitutes a powerful extension of the boolean one, being able to deal with the imprecision and subjectivity existing in the Information Retrieval process, users are not usually able ...

  • Design of a rule-driven architecture for a genetic T-norm 

    Frías Martínez, Enrique; Gutiérrez Ríos, Julio; Fernández Hernández, Felipe (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    Rule-Driven processing has been proved as a way of achieving high speed in fuzzy hardware. Up to now, rule-driven architectures were designed to work with minimum or product as T-norm. This paper proposes two new ...

  • Niching scheme for steady state GA-P and its application to fuzzy rule based classifiers induction 

    Sánchez Ramos, Luciano; Corrales González, José Antonio (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    A new method for applying grammar based Genetic Programming to learn fuzzy rule based classifiers from examples is proposed. It will produce linguistically understandable, rule based definitions in which not all ...

  • Safety regulations of fuzzy-logic control to nuclear reactors 

    Ruan, Da (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Article
    Accés obert
    We present an R&D project on fuzzy-logic control applications to the Belgian Nuclear Reactor 1 (BR1) at the Belgian Nuclear Research Centre (SCK•CEN). The project started in 1995 and aimed at investigating the added ...

  • Editorial [1st. EUSFLAT Conference & 9th. Spanish congress on fuzzy logic and technology. Selection of extended versions of papers presented ] 

    Mayor Forteza, Gaspar (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2000)
    Ressenya
    Accés obert