Envíos recientes

  • Naturaleza del razonamiento algebraico elemental 

    Godino, Juan D.; Castro, Walter F.; Aké, Lilia P; Rodríguez Wilhelmi, Miguel 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
    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
    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 ...
  • 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
    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
    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 % ...
  • Assessment of asymmetric leg loading before and after total hip arthroplasty using instrumented shoes 

    Martínez Ramírez, Alicia Upna; Weenk, Dirk; Lecumberri Villamediana, Pablo Upna; Verdonschot, Nico; Pakvis, Dean; Veltink, Peter H. (BioMed Central, 2014)   Artículo / Artikulua  OpenAccess
    Background: Total hip arthroplasty is a successful surgical treatment in patients with osteoarthritis of the hip. Different questionnaires are used by the clinicians to assess functional capacity and the patient's pain, ...
  • 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 ...
  • Comparison meaningful operators and ordinal invariant preferences 

    Candeal, Juan Carlos; Induráin Eraso, Esteban Upna (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    The existence of a continuous and order-preserving real-valued function, for the class of continuous and ordinal invariant total preorders, defined on the Banach space of all bounded real-valued functions, which are in ...
  • Valoración de la capacidad funcional en el ámbito domiciliario y en la clínica. Nuevas posibilidades de aplicación de la acelerometría para la valoración de la marcha, equilibrio y potencia muscular en personas mayores 

    Izquierdo Redín, Mikel Upna; Martínez Ramírez, Alicia Upna; Larrión, J. L.; Irujo Espinosa, M.; Gómez Fernández, Marisol Upna (Gobierno de Navarra, 2008)   Artículo / Artikulua  OpenAccess
    Dentro de cualquier población de individuos mayores de 65 años, una proporción sustancial (entre el 6% y el 25%) sufre diferentes síntomas del síndrome de fragilidad. A pesar de la complejidad del termino fragilidad y de ...
  • Distribution patterns of infection with multiple types of human papillomaviruses and their association with risk factors 

    Soto de León, Sara; Camargo, Milena; Sánchez, Ricardo; Muñoz, Marina Upna; Pérez Prados, Antonio Upna; Purroy Unanua, Antonio Upna; Patarroyo, Manuel Elkin; Patarroyo, Manuel Alfonso (Public Library of Science, 2011)   Artículo / Artikulua  OpenAccess
    Background: Infection with multiple types of human papillomavirus (HPV) is one of the main risk factors associated with the development of cervical lesions. In this study, cervical samples collected from 1, 810 women with ...
  • On perfectly homogeneous bases in quasi-Banach spaces 

    Albiac Alesanco, Fernando José Upna; Leránoz Istúriz, María Camino Upna (Hindawi Publishing Corporation, 2009)   Artículo / Artikulua  OpenAccess
    For 0 < p < infinity the unit vector basis of l(p) has the property of perfect homogeneity: it is equivalent to all its normalized block basic sequences, that is, perfectly homogeneous bases are a special case of symmetric ...
  • The Tsirelson space tau (p) has a unique unconditional basis up to permutation for 0 < p < 1 

    Albiac Alesanco, Fernando José Upna; Leránoz Istúriz, María Camino Upna (Hindawi Publishing Corporation, 2009)   Artículo / Artikulua  OpenAccess
    We show that the p-convexified Tsirelson space tau((p)) for 0 < p < 1 and all its complemented subspaces with unconditional basis have unique unconditional basis up to permutation. The techniques involved in the proof are ...