• Aggregation functions to combine RGB color channels in stereo matching 

      Galar Idoate, Mikel Upna; Jurío Munárriz, Aránzazu Upna; López Molina, Carlos Upna; Sanz Delgado, José Antonio Upna; Paternain Dallo, Daniel Upna; Bustince Sola, Humberto Upna (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      In this paper we present a comparison study between different aggregation functions for the combination of RGB color channels in stereo matching problem. We introduce color information from images to the stereo matching ...
    • An algorithm for group decision making using n -dimensional fuzzy sets, admissible orders and OWA operators 

      Miguel Turullols, Laura de Upna; Sesma Sara, Mikel Upna; Elkano Ilintxeta, Mikel Upna; Asiain Ollo, María José Upna; Bustince Sola, Humberto Upna (Elsevier, 2017)   Artículo / Artikulua
      In this paper we propose an algorithm to solve group decision making problems using n -dimensional fuzzy sets, namely, sets in which the membership degree of each element to the set is given by an in- creasing tuple of n ...
    • Analysis and stochastic characterization of TCP flows 

      Aracil Rico, Javier Upna; Morató Osés, Daniel Upna; Izal Azcárate, Mikel Upna (Springer, 2000)   Artículo / Artikulua  OpenAccess
      Since the most Internet services use TCP as a transport protocol there is a growing interest in the characterization of TCP flows. However, the flow characteristics depend on a large number of factors, due to the complexity ...
    • Application of the L-fuzzy concept analysis in the morphological image and signal processing 

      Alcalde, Cristina; Burusco Juandeaburre, Ana Upna; Fuentes González, Ramón Upna (Springer International Publishing, 2014)   Artículo / Artikulua  OpenAccess
      In this work we are going to set up a new relationship between the L-fuzzy Concept Analysis and the Fuzzy Mathematical Morphology. Specifically we prove that the problem of finding fuzzy images or signals that remain ...
    • Application of two different methods for extending lattice-valued restricted equivalence functions used for constructing similarity measures on L-fuzzy sets 

      Palmeira, Eduardo S.; Bedregal, Benjamin; Bustince Sola, Humberto Upna; Paternain Dallo, Daniel Upna; Miguel Turullols, Laura de Upna (Elsevier, 2018)   Artículo / Artikulua
      Based on previous investigations, we have proposed two different methods to extend lattice-valued fuzzy connectives (t-norms, t-conorms, negations and implications) and other related operators, considering a generalized ...
    • Binary relations coming from solutions of functional equations: orderings and fuzzy subsets 

      Campión Arrastia, María Jesús Upna; Miguel Turullols, Laura de Upna; García Catalán, Olga Raquel Upna; Induráin Eraso, Esteban Upna; Abrísqueta Usaola, Francisco Javier Upna (World Scientific Publishing Company, 2017)   Artículo / Artikulua
      We analyze the main properties of binary relations, defined o n a nonempty set, that arise in a natural way when dealing with real-valued functions that satisfy certain classical functional equations on two variables. We ...
    • BioBuilder as a database development and functional annotation platform for proteins 

      Navarro, J. Daniel; Talreja, Naveen; Peri, Suraj; Vrushabendra, B. M.; Rashmi, B. P.; Padma, N.; Surendranath, Vineeth; Jonnalagadda, Chandra Kiran; Kousthub, P. S.; Deshpande, Nandan; Shanker, K.; Pandey, Akhilesh (BioMed Central, 2004)   Artículo / Artikulua  OpenAccess
      Background: The explosion in biological information creates the need for databases that are easy to develop, easy to maintain and can be easily manipulated by annotators who are most likely to be biologists. However, ...
    • A compact evolutionary interval-valued fuzzy rule-based classification system for the modeling and prediction of real-world financial applications with imbalanced data 

      Sanz Delgado, José Antonio Upna; Bernardo, Dario; Herrera, Francisco; Bustince Sola, Humberto Upna; Hagras, Hani (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      The current financial crisis has stressed the need of obtaining more accurate prediction models in order to decrease the risk when investing money on economic opportunities. In addition, the transparency of the process ...
    • Concept lattices associated with interval-valued L-fuzzy contexts 

      Burusco Juandeaburre, Ana Upna; Fuentes González, Ramón Upna (Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1995)   Artículo / Artikulua  OpenAccess
      In 1882 Wille published the paper titled Restructuring lattice theory: an approach based on hierarchies of concepts, where he developed a new theory called formal concept theory. In that paper he analyzes 0/1 relations ...
    • Construction of admissible linear orders for interval-valued Atanassov intuitionistic fuzzy sets with an application to decision making 

      Miguel Turullols, Laura de Upna; Bustince Sola, Humberto Upna; Fernández Fernández, Francisco Javier Upna; Induráin Eraso, Esteban Upna; Kolesárová, Anna; Mesiar, Radko (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      In this work we introduce a method for constructing linear orders between pairs of intervals by using aggregation functions. We adapt this method to the case of interval-valued Atanassov intuitionistic fuzzy sets and we ...
    • Delay-throughput curves for timer-based OBS burstifiers with light load 

      Izal Azcárate, Mikel Upna; Aracil Rico, Javier Upna; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna (IEEE, 2006)   Artículo / Artikulua  OpenAccess
      The OBS burstifier delay-throughput curves are analyzed in this paper. The burstifier incorporates a timer-based scheme with minimum burst size, i. e., bursts are subject to padding in light-load scenarios. Precisely, due ...
    • Enhancing multi-class classification in FARC-HD fuzzy classifier: on the synergy between n-dimensional overlap functions and decomposition strategies 

      Elkano Ilintxeta, Mikel Upna; Galar Idoate, Mikel Upna; Sanz Delgado, José Antonio Upna; Fernández, Alberto; Barrenechea Tartas, Edurne Upna; Herrera, Francisco; Bustince Sola, Humberto Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      There are many real-world classification problems involving multiple classes, e.g., in bioinformatics, computer vision or medicine. These problems are generally more difficult than their binary counterparts. In this scenario, ...
    • Evolution in time of L-fuzzy context sequences 

      Alcalde, Cristina; Burusco Juandeaburre, Ana Upna; Bustince Sola, Humberto Upna; Jurío Munárriz, Aránzazu Upna; Sanz Delgado, José Antonio Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      In this work, we consider a complete lattice L and we study L-fuzzy context sequences which represent the evolution in time of an L-fuzzy context. To carry out this study, in the first part of the paper, we consider n-ary ...
    • Extensions of fuzzy sets in image processing: an overview 

      Pagola Barrio, Miguel Upna; Barrenechea Tartas, Edurne Upna; Bustince Sola, Humberto Upna; Fernández Fernández, Francisco Javier Upna; Galar Idoate, Mikel Upna; Jurío Munárriz, Aránzazu Upna; López Molina, Carlos Upna; Paternain Dallo, Daniel Upna; Sanz Delgado, José Antonio Upna; Couto, P.; Melo Pinto, P. (EUSFLAT, 2011)   Artículo / Artikulua  OpenAccess
      This work presents a valuable review for the interested reader of the recent Works using extensions of fuzzy sets in image processing. The chapter is divided as follows: first we recall the basics of the extensions of fuzzy ...
    • A framework for radial data comparison and its application to fingerprint analysis 

      Marco Detchart, Cedric Upna; Cerrón González, Juan Upna; Miguel Turullols, Laura de Upna; López Molina, Carlos Upna; Bustince Sola, Humberto Upna; Galar Idoate, Mikel Upna (Elsevier, 2016)   Artículo / Artikulua
      This work tackles the comparison of radial data, and proposes comparison measures that are further applied to fingerprint analysis. First, we study the similarity of scalar and non-scalar radial data, elaborated on previous ...
    • Fuzzy concept lattices and fuzzy relation equations in the retrieval processing of images and signals 

      Alcalde, Cristina; Burusco Juandeaburre, Ana; Díaz Moreno, Juan Carlos; Medina, Jesús (World Scientific, 2017)   Artículo / Artikulua
      This paper considers the introduced relations between fuzzy property-oriented concept lattices and fuzzy relation equations, on the one hand, and mathematical morphology, on the other hand, in the retrieval processing ...
    • Fuzzy morphological operators in image processing 

      Burillo López, Pedro Upna; Frago Paños, Noé Natalio Upna; Fuentes González, Ramón Upna (Universitat Politècnica de Catalunya, 2003)   Artículo / Artikulua  OpenAccess
      First of all, in this paper we propose a family of fuzzy implication operators, which the generalised Luckasiewicz´s one, and to analyse the impacts of Smets and Magrez properties on these operators. The result of this ...
    • Fuzzy rule-based classification systems for multi-class problems using binary decomposition strategies: on the influence of n-dimensional overlap functions in the fuzzy reasoning method 

      Elkano Ilintxeta, Mikel Upna; Galar Idoate, Mikel Upna; Sanz Delgado, José Antonio Upna; Bustince Sola, Humberto Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Multi-class classification problems appear in a broad variety of real-world problems, e.g., medicine, genomics, bioinformatics, or computer vision. In this context, decomposition strategies are useful to increase the ...
    • Generation of fuzzy mathematical morphologies 

      Burillo López, Pedro Upna; Frago Paños, Noé Natalio Upna; Fuentes González, Ramón Upna (Universitat Politècnica de Catalunya, 2001)   Artículo / Artikulua  OpenAccess
      Fuzzy Mathematical Morphology aims to extend the binary morphological operators to grey-level images. In order to define the basic morphological operations fuzzy erosion, dilation, opening and closing, we introduce ...
    • A genetic tuning to improve the performance of fuzzy rule-based classification systems with interval-valued fuzzy sets: degree of ignorance and lateral position 

      Sanz Delgado, José Antonio Upna; Fernández, Alberto; Bustince Sola, Humberto Upna; Herrera, Francisco (Elsevier, 2011)   Artículo / Artikulua  OpenAccess
      Fuzzy Rule-Based Systems are appropriate tools to deal with classification problems due to their good properties. However, they can suffer a lack of system accuracy as a result of the uncertainty inherent in the definition ...