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  • Robust rank correlation coefficients on the basis of fuzzy 

    Bodenhofer, U.; Klawonn, F. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    The goal of this paper is to demonstrate that established rank correlation measures are not ideally suited for measuring rank correlation for numerical data that are perturbed by noise. We propose to use robust rank ...
  • Optimization of fuzzy rule sets using a bacterial evolutionary algorithm 

    Drobics, Mario; Botzheim, J. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    In this paper we present a novel approach where we rst create a large set of (possibly) redundant rules using inductive rule learning and where we use a bacterial evolutionary algorithm to identify the best subset of ...
  • Fuzzy sequential pattern mining in incomplete databases 

    Fiot, Céline; Laurent, Anne; Teisseire, Maguelonne (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Recent widening of data mining application areas have lead to new issues. For instance, frequent sequence discovery techniques that were developed for customer behaviour analysis are now applied to analyse industrial or ...
  • Automatic video annotation with forests of fuzzy decision trees 

    Detyniecki, Marcin; Marsala, Christophe (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Nowadays, the annotation of videos with high-level semantic concepts or features is a great challenge. In this paper, this problem is tackled by learning, by means of Fuzzy Decision Trees (FDT), automatic rules based on ...
  • Mining gradual dependencies with variation strength 

    Molina, C.; Serrano, J.M.; Sánchez, D.; Vila, M.A. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    In this paper we propose a definition of gradual dependence as a fuzzy association rule. Gradual dependencies represent tendencies in the variation of the degree of fulfilment of properties in a set of objects. We define ...
  • Semigroups of semi-copulas and evolution of dependence at increase of age 

    Foschi, R.; Spizzichino, Fabio (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    We consider a pair of exchangeable lifetimes X; Y and the families of the conditional survival functions F t(x;y) of (X t; Y t) given (X > t; Y > t).We analyze some properties of dependence and of ageing for F t(x;y) ...
  • Bounds for value at risk : the approach based on copulas with homogeneous tails 

    Jaworski, P. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    The theory of copulas provides a useful tool for modeling dependence in risk management. In insurance and nance, as well as in other applications, dependence of extreme events is particularly important, hence there is ...
  • Logical aggregation based on interpolative 

    Radojevic, Dragan (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
    Article
    Accés obert
    Explicit inclusion of logic in the process of aggregation (information fu- sion) is very important in real problems from many points of view such as adequacy and transparency. In this paper aggregation is treated as a ...