1999, Vol. VI, Núm. 1

Summary

  • A hybrid evolutionary approach to intelligent system design 

    Badr, Amr; Farag, Ibrahim; Eid, Saad (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    The problem of developing a general methodology for system design has always been demanding. For this purpose, an evolutionary algorithm, adapted with design-specific representation data structures is devised. The ...

  • Weighted sums of aggregation operators 

    Calvo Sánchez, Tomasa; Baets, Bernard de; Mesiar, Radko (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    he aim of this work is to investigate when a weighted sum, or in other words, a linear combination, of two or more aggregation operators leads to a new aggregation operator. For weights belonging to the real unit interval, ...

  • BL-algebras of basic fuzzy logic 

    Turunen, Esko (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    BL-algebras [7] rise as Lindenbaum algebras from certain logical axioms familiar in fuzzy logic framework. BL-algebras are studied by means of deductive systems and co-annihilators. Duals of many theorems known to hold ...

  • Boolean structure of triangular forms 

    Ziaie, Seyed Abbas; Ray, Suryansu; Mashinchi, Mashallah; Kamran, Rasool (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    In this note results obtained by S.Ray (1997) on representation of a Boolean algebra by its triangular norms are generalized.

  • Capital budgeting problems with fuzzy cashflows 

    Carlsson, Christer; Fuller, Robert (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    We consider the {\em internal rate of return} (IRR) decision rule in capital budgeting problems with fuzzy cash flows. The possibility distribution of the IRR at any $r\geq0$,is defined to be the degree of possibility ...

  • Fuzzy max-min classifiers decide locally on the basis of two attributes 

    Von Schmidt, Birka; Klawonn, Frank (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    Fuzzy classification systems differ from fuzzy controllers in the form of their outputs. For classification problems a decision between a finite number of discrete classes has to be made, whereas in fuzzy control the output ...

  • Evolutionary design of fuzzy logic controllers using strongly-typed GP 

    Alba Torres, Enrique; Cotta Porras, Carlos; Troya Linero, José María (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    An evolutionary approach to the design of fuzzy logic controllers is presented in this paper. We propose the use of the genetic programming paradigm to evolve fuzzy rule-bases (internally represented as type-constrained ...

  • An example of the knowledge based controller-design and evaluation 

    Tezak, Oto (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Article
    Open Access
    Knowledge based controller for a balance control model is presented in this paper. The design of the controller was based on the human control of the same process. Developed controller is tested by means of simulation and ...

  • Editorial [ New editorial line and format] 

    Castro Peña, Juan Luis; Jacas Moral, Juan (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
    Review
    Open Access