Now showing items 112-131 of 135

    • Scale recoding in sociological research: a new validation methodology. An application to a political survey 

      Abascal Fernández, Elena Upna Orcid; Díaz de Rada Igúzquiza, Vidal Upna Orcid; García Lautre, Ignacio Upna Orcid; Landaluce, M. Isabel (CSIC, 2019)   Artículo / Artikulua  OpenAccess
      La recodificación de variables es una etapa habitual en el análisis de datos de encuesta. No está exenta de riesgos, como pueden ser la introducción de sesgos o las posibles deformaciones de los datos originales. En este ...
    • Sensorimotor functional connectivity: a neurophysiological factor related to BCI performance 

      Vidaurre, Carmen Upna Orcid; Haufe, Stefan; Jorajuría, Tania; Müller, Klaus Robert; Nikulin, Vadim V. (Frontiers Media, 2020)   Artículo / Artikulua  OpenAccess
      Brain-computer interfaces (BCIs) are systems that allow users to control devices using brain activity alone. However, the ability of participants to command BCIs varies from subject to subject. About 20% of potential users ...
    • Short- and mid-term evaluation of the use of electric vehicles in urban freight transport collaborative networks: a case study 

      Muñoz Villamizar, Andrés; Quintero Araújo, Carlos L.; Montoya Torres, Jairo R.; Faulín Fajardo, Javier Upna Orcid (Taylor & Francis, 2019)   Artículo / Artikulua  OpenAccess
      Despite its negative impacts, freight transportation is a primary component of all supply chains. Decision makers have considered diverse strategies, such as Horizontal Collaboration (HC) and the usage of alternative types ...
    • Similarity between interval-valued fuzzy sets taking into account the width of the intervals and admissible orders 

      Bustince Sola, Humberto Upna Orcid; Marco Detchart, Cedric Upna Orcid; Fernández Fernández, Francisco Javier Upna Orcid; Wagner, C.; Garibaldi, J. M. (Elsevier, 2020)   Artículo / Artikulua
      In this work we study a new class of similarity measures between interval-valued fuzzy sets. The novelty of our approach lays, firstly, on the fact that we develop all the notions with respect to total orders of intervals; ...
    • Some preference involved aggregation models for basic uncertain information using uncertainty transformation 

      Yang, RouJian; Jin, LeSheng; Paternain Dallo, Daniel Upna Orcid; Yager, Ronald R.; Bustince Sola, Humberto Upna Orcid (IOS Press, 2020)   Artículo / Artikulua  OpenAccess
      In decision making, very often the data collected are with different extents of uncertainty. The recently introduced concept, Basic Uncertain Information (BUI), serves as one ideal information representation to well model ...
    • Space-time analysis of ovarian cancer mortality rates by age groups in Spanish provinces (1989-2015) 

      Trandafir, Paula Camelia Upna Orcid; Adin Urtasun, Aritz Upna Orcid; Ugarte Martínez, María Dolores Upna Orcid (BioMed Central, 2020)   Artículo / Artikulua  OpenAccess
      Background: Ovarian cancer is a silent and largely asymptomatic cancer, leading to late diagnosis and worse prognosis. The late-stage detection and low survival rates, makes the study of the space-time evolution of ovarian ...
    • Stability of phenolic compounds in grape stem extracts 

      Esparza Catalán, Irene Upna; Cimminelli, María José Upna; Moler Cuiral, José Antonio Upna Orcid; Jiménez Moreno, Nerea Upna Orcid; Ancín Azpilicueta, Carmen Upna Orcid (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Grape stem is rich in phenolic compounds, especially stilbenes. These antioxidants can be degraded during the storage of grape stem extracts for long periods of time. The aim of this work was to analyze the stability of ...
    • Strengthened ordered directionally monotone functions. Links between the different notions of monotonicity 

      Sesma Sara, Mikel Upna Orcid; Lafuente López, Julio Upna Orcid; Roldán López de Hierro, Antonio F.; Mesiar, Radko; Bustince Sola, Humberto Upna Orcid (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
      In this work, we propose a new notion of monotonicity: strengthened ordered directional monotonicity. This generalization of monotonicity is based on directional monotonicity and ordered directional monotonicity, two recent ...
    • Strong stability preserving properties of composition Runge-Kutta schemes 

      Higueras Sanz, Inmaculada Upna Orcid; Roldán Marrodán, Teodoro Upna Orcid (Springer, 2019)   Artículo / Artikulua  OpenAccess
      In this paper Strong Stability Preserving (SSP) properties of Runge Kutta methods obtained by com- posing k different schemes with different step sizes are studied. The SSP coefficient of the composition method is obtained ...
    • A survey on the mathematical foundations of axiomatic entropy: representability and orderings 

      Campión Arrastia, María Jesús Upna Orcid; Gómez Polo, Cristina Upna Orcid; Induráin Eraso, Esteban Upna Orcid; Raventós Pujol, Armajac Upna Orcid (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      Different abstract versions of entropy, encountered in science, are interpreted in the light of numerical representations of several ordered structures, as total-preorders, interval-orders and semiorders. Intransitivities, ...
    • The swallowtail integral in the highly oscillatory region 

      Ferreira González, Chelo Upna; López García, José Luis Upna Orcid; Pérez Sinusía, Ester Upna Orcid (2020)   Artículo / Artikulua  OpenAccess
      We analyze the asymptotic behavior of the swallowtail integral R ∞ −∞ e i(t 5+xt3+yt2+zt)dt for large values of |y| and bounded values of |x| and |z|. We use the simpli ed saddle point method introduced in [López et ...
    • T-overlap t-migrative functions: a generalization of migrativity in t-overlap functions 

      Zapata, Hugo; Bustince Sola, Humberto Upna Orcid; Pereira Dimuro, Graçaliz Upna Orcid (Universidad Distrital Francisco José de Caldas (Colombia), 2020)   Artículo / Artikulua  OpenAccess
      Este artículo introduce una generalización de funciones migrativas por extensión de la condición de la operación producto aplicada en las variables. Más específicamente, en lugar de exigir multiplicar la variable x por un ...
    • Tailoring the structural and magnetic properties of Co-Zn nanosized ferrites for hyperthermia applications 

      Gómez Polo, Cristina Upna Orcid; Recarte Callado, Vicente Upna Orcid; Cervera Gabalda, Laura María Upna; Beato López, Juan Jesús Upna Orcid; López García, Javier Upna; Rodríguez Velamazán, José Alberto; Ugarte Martínez, María Dolores Upna Orcid; Mendonça, E. C.; Duque, J. G. S. (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      A comparative study of the magnetic properties (magnetic moment, magnetocrystalline anisotropy) and hyperthermia response in Co-Zn spinel nanoparticles is presented. The CoxZn1-xFe2O4 nanoparticles (x = 1, 0.5, 0.4, 0.3, ...
    • Temperature and water availability during maturation affect the cytokinins and auxins profile of radiata pine somatic embryos 

      Moncaleán, Paloma; García Mendiguren, Olatz; Novák, Ondrej; Strnad,Miroslav; Goicoa Mangado, Tomás Upna Orcid; Ugarte Martínez, María Dolores Upna Orcid; Montalbán, Itziar A. (Frontiers Media, 2018)   Artículo / Artikulua  OpenAccess
      Somatic embryogenesis (SE) provides us a potent biotechnological tool to manipulate the physical and chemical conditions (water availability) along the process and to study their effect in the final success in terms of ...
    • Three categories of set-valued generalisations from fuzzy sets to interval-valued and Atanassov intuitionistic fuzzy sets 

      Couso, Inés; Bustince Sola, Humberto Upna Orcid (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      Many different notions included in the fuzzy set literature can be expressed in terms of functionals defined over collections of tuples of fuzzy sets. During the last decades, different authors have independently generalised ...
    • Topologies for semicontinuous Richter–Peleg multi-utilities 

      Bosi, Gianni; Estevan Muguerza, Asier Upna Orcid; Raventós Pujol, Armajac Upna Orcid (Springer, 2020)   Artículo / Artikulua  OpenAccess
      The present paper gives a topological solution to representability problems related to multi-utility, in the field of Decision Theory. Necessary and sufficient topologies for the existence of a semicontinuous and finite ...
    • Trend analysis in L-fuzzy contexts with absent values 

      Alcalde, Cristina; Burusco Juandeaburre, Ana Upna Orcid; Bustince Sola, Humberto Upna Orcid; Sesma Sara, Mikel Upna Orcid (University of Sistan and Baluchestan (Irán), 2020)   Artículo / Artikulua  OpenAccess
      Sometimes we have to work with L-fuzzy context sequences where one or more values are missing. These sequences can represent, among other things, the evolution in time of an L-fuzzy context. The studies of tendencies that ...
    • Two-level resolution of relative risk of dengue disease in a hyperendemic city of Colombia 

      Adin Urtasun, Aritz Upna Orcid; Martínez Bello, Daniel Adyro; López Quílez, Antonio; Ugarte Martínez, María Dolores Upna Orcid (Public Library of Science, 2018)   Artículo / Artikulua  OpenAccess
      Risk maps of dengue disease offer to the public health officers a tool to model disease risk in space and time. We analyzed the geographical distribution of relative incidence risk of dengue disease in a high incidence ...
    • Unconditional and quasi-greedy bases in L-p with applications to Jacobi polynomials Fourier series 

      Albiac Alesanco, Fernando José Upna Orcid; Ansorena, José L.; Ciaurri, Óscar; Varona, Juan L. (European Mathematical Society, 2019)   Artículo / Artikulua  OpenAccess
      We show that the decreasing rearrangement of the Fourier series with respect to the Jacobi polynomials for functions in L-p does not converge unless p = 2. As a by-product of our work on quasi-greedy bases in L-p(µ), we ...
    • A unified view of different axiomatic measures defined on L-fuzzy sets 

      Couso, Inés; Bustince Sola, Humberto Upna Orcid; Sánchez, Luciano (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      The recent literature contains a multitude of extensions of (axiomatic) notions from the context of ordinary fuzzy sets to more general contexts. Using the language of lattices, we provide a general and compact formulation ...