2007, Vol. XIV, Núm. 1

Summary

  • Algorithms for classification based on k-NN 

    Laguía, Manuel; Castro, Juan L. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2007)
    Article
    Open Access
    In this paper we focus on methods that solve classification tasks based on distances, and we introduce some variants of the basic k-NN method adding up to 3 characteristics. The experiments reveal a relationship between ...

  • Homogeneity properties of hypercubes 

    Ovchinnikov, Sergei (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2007)
    Article
    Open Access
    The paper reviews properties of hypercubes of arbitrary dimension from the metric geometry point of view. It is shown, in particular, that a hypercube is a homogeneous metric space with respect to a class of partial cubes. ...

  • Weakening of fuzzy relational queries: an absolute proximity relation-based approach 

    Bosc, P.; HadjAli, A.; Pivert, O. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica / Mathware & Soft Computing. 2007, vol. 14, núm. 1, 2007)
    Article
    Open Access
    In this paper we address the problem of query failure in the context of flexible querying. We propose a fuzzy set–based approach for relaxing queries involving gradual predicates. This approach relies on the notion of ...

  • Characterizing Ordered Semigroups by Means of Intuitionistic Fuzzy Bi-ideals 

    Hong, Yongfa; Xu, Ruiping; Fang, Xianwen (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2007)
    Article
    Open Access
    In this paper, we endow set S with the structure of an ordered semigroup and define “intuitionistic fuzzy” analogous for several notions that have been proved to be useful in the theory of ordered semigroups and give some ...

  • Convergences in perfect BL-algebras 

    Ciungu, L.C. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2007)
    Article
    Open Access
    The aim of the paper is to investigate some concepts of convergence in the class of perfect BL-algebras. Similarity convergence was developed by G. Georgescu and A. Popescu in the case of the residuated lattices, while ...