Recent Submissions

  • Weightable quasi-metrics related to fuzzy sets 

    Campión Arrastia, María Jesús Upna; García Catalán, Olga Raquel Upna; Induráin Eraso, Esteban Upna; Valero, Óscar (Hacettepe University (Turquía), 2018)   Artículo / Artikulua  OpenAccess
    We show that the definition of a fuzzy set is directly related to the existence of a weightable quasi-metric on a universe. This relationship is also explored in terms of functional equations coming either from the membership ...
  • A large scale screening study with a SMR-based BCI: Categorization of BCI users and differences in their SMR activity 

    Sannelli, Claudia; Vidaurre, Carmen; Müller, Klaus Robert; Blankertz, Benjamin (Plos one, 2019)   Artículo / Artikulua  OpenAccess
    Brain-Computer Interfaces (BCIs) are inefficient for a non-negligible part of the population, estimated around 25%. To understand this phenomenon in Sensorimotor Rhythm (SMR) based BCIs, data from a large-scale screening ...
  • Desarrollo de la competencia de análisis ontosemiótico de futuros profesores de matemáticas 

    Giacomone, Belén; Godino, Juan D.; Wilhelmi, Miguel R. Upna; Blanco, Teresa F. (Universidad Complutense de Madrid, 2018)   Artículo / Artikulua  OpenAccess
    Una enseñanza adecuada de las matemáticas requiere el conocimiento y la competencia de los profesores para identificar la variedad de objetos y significados involucrados en la resolución de tareas escolares. En este ...
  • Niveles de algebrización de las prácticas matemáticas escolares. Articulación de las perspectivas ontosemiótica y antropológica 

    Godino, Juan D.; Neto, T.; Wilhelmi, Miguel R. Upna; Aké, Lilia P.; Etchegaray, S.; Lasa Oyarbide, Aitzol Upna (Sociedad Española de Investigación en Educación Matemática (SEIEM), 2015)   Artículo / Artikulua  OpenAccess
    En el marco del enfoque ontosemiótico del conocimiento y la instrucción matemáticos se ha propuesto una caracterización del razonamiento algebraico en Educación Primaria basada en la distinción de tres niveles de ...
  • Normas epistémicas en la formación musical del maestro de educación primaria 

    Belletich Ruiz, Olga Upna; Ángel Alvarado, Rolando Alfredo; Wilhelmi, Miguel R. Upna (Universidad de Granada, 2017)   Artículo / Artikulua  OpenAccess
    En España, la actual reforma educativa está forzando a las universidades a ajustar la formación inicial docente porque el nuevo sistema escolar orienta el currículo hacia la formación por competencias. Esta investigación ...
  • La educación musical en la formación básica en España. El problema de la dispersión curricular 

    Belletich Ruiz, Olga Upna; Wilhelmi, Miguel R. Upna; Ángel Alvarado, Rolando Alfredo (Pontificia Universidad Católica de Valparaíso, 2016)   Artículo / Artikulua  OpenAccess
    En España la Educación Artística pierde su carácter obligatorio en Educación Primaria con la entrada en vigencia de la Ley Orgánica para la Mejora de la Calidad Educativa [LOMCE], relegando la decisión curricular a ...
  • Semicontinuous planar total preorders on non-separable metric spaces 

    Campión Arrastia, María Jesús Upna; Candeal, Juan Carlos; Induráin Eraso, Esteban Upna (The Korean Mathematical Society, 2009)   Artículo / Artikulua  OpenAccess
    We prove that every non-separable connected metric space can be endowed with a total preorder that is order-isomorphic to a nonrepresentable subset of the lexicographic plane and semicontinuous with respect to the metric topology.
  • Naturaleza del razonamiento algebraico elemental 

    Godino, Juan D.; Castro, Walter F.; Aké, Lilia P.; Wilhelmi, Miguel R. Upna (UNESP, 2012)   Artículo / Artikulua  OpenAccess
    La introducción del razonamiento algebraico en educación primaria es un tema de interés para la investigación e innovación curricular en didáctica de las matemáticas, y presupone una visión ampliada de la naturaleza del ...
  • Some characterizations of lattice OWA operators 

    Miguel Turullols, Laura de Upna; Paternain Dallo, Daniel Upna; Lizasoain Iriso, María Inmaculada Upna; Ochoa Lezaun, Gustavo Upna; Bustince Sola, Humberto Upna (World Scientific Publishing Company, 2017)   Artículo / Artikulua  OpenAccess
    Ordered Weighted Averaging (OWA) operators are a family of aggregation which fusion data. If the data are real numbers, then OWA operators can be characterized either as an special kind of Choquet integral or simply as ...
  • 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  OpenAccess
    We analyze the main properties of binary relations, defined on 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 ...
  • Orness for idempotent aggregation functions 

    Legarreta, Leire; Lizasoain Iriso, María Inmaculada Upna; Mardones Pérez, Iraide (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Aggregation functions are mathematical operators that merge given data in order to obtain a global value that preserves the information given by the data as much as possible. In most practical applications, this value is ...
  • 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  OpenAccess
    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 ...
  • Pointwise aggregation of maps: its structural functional equation and some applications to social choice theory 

    Miguel Turullols, Laura de Upna; Campión Arrastia, María Jesús Upna; Candeal, Juan Carlos; Induráin Eraso, Esteban Upna; Paternain Dallo, Daniel Upna (Elsevier, 2017)   Artículo / Artikulua  OpenAccess
    We study a structural functional equation that is directly related to the pointwise aggregation of a finite number of maps from a given nonempty set into another. First we establish links between pointwise aggregation and ...
  • Grupos primitivos con subgrupos maximales pequeños 

    Lafuente López, Julio Upna (Universidad Autónoma de Barcelona, Departamento de Matemáticas, 1985)   Artículo / Artikulua  OpenAccess
  • Los retículos de las clases de Schunck normales y de las clases derivadas 

    Lafuente López, Julio Upna (Real Sociedad Matemática EspañolaCSIC, 1979)   Artículo / Artikulua  OpenAccess
    All groups to be considered are finite. The main result of this paper is the following: the normal Schunck classes compose a complete and distributive lattice antiisomorphic to the lattice composed by the derived classes. ...
  • The lattice of fitting classes which are right extensible by soluble groups 

    Iranzo, M.J.; Lafuente López, Julio Upna; Pérez Monasor, F. (Universidad Autónoma de Barcelona, Departamento de Matemáticas, 2005)   Artículo / Artikulua  OpenAccess
    In this paper we study the set of fitting classes which are right extensible by soluble groups ordered by the inclusion relation. The consideration of the associated lattices gives rise to new fitting classes and it allows ...
  • Interval-valued Atanassov intuitionistic OWA aggregations using admissible linear orders and their application to decision making 

    Miguel Turullols, Laura de Upna; Bustince Sola, Humberto Upna; Pekala, Barbara; Bentkowska, Urszula; Silva, Ivanoska da; Bedregal, Benjamin; Mesiar, Radko; Ochoa Lezaun, Gustavo Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    Based on the definition of admissible order for interval-valued Atanassov intuitionistic fuzzy sets, we study OWA operators in these sets distinguishing between the weights associated to the membership and those associated ...
  • Pre-operative ambulatory measurement of asymmetric lower limb loading during walking in total hip arthroplasty patients 

    Martínez Ramírez, Alicia Upna; Weenk, Dirk; Lecumberri Villamediana, Pablo Upna; Verdonschot, Nico; Pakvis, Dean; Veltink, Peter H. (BioMed Central, 2013)   Artículo / Artikulua  OpenAccess
    Background: Total hip arthroplasty is a successful surgical procedure to treat hip osteoarthritis. Clinicians use different questionnaires to assess the patient’s pain and functional capacity. Furthermore, they assess the ...
  • An evaluation of the 30-s chair stand test in older adults: frailty detection based on kinematic parameters from a single inertial unit 

    Millor Muruzábal, Nora Upna; Lecumberri Villamediana, Pablo Upna; Gómez Fernández, Marisol Upna; Martínez Ramírez, Alicia Upna; Izquierdo Redín, Mikel Upna (BioMed Central, 2013)   Artículo / Artikulua  OpenAccess
    Background: A growing interest in frailty syndrome exists because it is regarded as a major predictor of co-morbidities and mortality in older populations. Nevertheless, frailty assessment has been controversial, particularly ...
  • Frailty assessment based on trunk kinematic parameters during walking 

    Martínez Ramírez, Alicia Upna; Martinikorena Aranburu, Ion Upna; Gómez Fernández, Marisol Upna; Lecumberri Villamediana, Pablo Upna; Millor Muruzábal, Nora Upna; Rodríguez Mañas, Leocadio; García García, Francisco José; Izquierdo Redín, Mikel Upna (BioMed Central, 2015)   Artículo / Artikulua  OpenAccess
    Background: Physical frailty has become the center of attention of basic, clinical and demographic research due to its incidence level and gravity of adverse outcomes with age. Frailty syndrome is estimated to affect 20 % ...

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