Now showing items 1-20 of 182

    • A 1.2-V current-mode RMS-to-DC converter based on a novel two-quadrant electronically simulated MOS translinear loop 

      Martincorena Arraiza, Maite; Cruz Blas, Carlos Aristóteles de la Upna; Algueta-Miguel, Jose M. Upna; López Martín, Antonio Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A novel current-mode CMOS RMS-to-DC converter using translinear techniques is introduced. It is based on a squarer/divider cell that is implemented using an electronically simulated loop with a novel biasing scheme that ...
    • A combination of a vibrational electromagnetic energy harvester and a giant magnetoimpedance (GMI) sensor 

      Beato López, Juan Jesús Upna; Royo, Isaac Upna; Algueta-Miguel, Jose M. Upna; Gómez Polo, Cristina (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      An energy harvesting device combined with a giant magnetoimpedance (GMI) sensor is presented to analyze low frequency vibrating systems. An electromagnetic harvester based on magnetic levitation is proposed for the electric ...
    • Development of an aptamer based luminescent optical fiber sensor for the continuous monitoring of Hg2+ in aqueous media 

      Acha Morrás, Nerea de Upna; Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      A fluorescent optical fiber sensor for the detection of mercury (Hg2+) ions in aqueous solutions is presented in this work. The sensor was based on a fluorophore-labeled thymine (T)-rich oligodeoxyribonucleotide (ON) ...
    • Generation of lossy mode resonances with different nanocoatings deposited on coverslips 

      Fuentes Lorenzo, Omar; Goicoechea Fernández, Javier Upna; Corres Sanz, Jesús María Upna; Del Villar, Ignacio Upna; Ozcariz Celaya, Aritz Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2020)   Artículo / Artikulua  OpenAccess
      The generation of lossy mode resonances (LMRs) with a setup based on lateral incidence of light in coverslips is a simple platform that can be used for sensing. Here the versatility of this platform is proved by studying ...
    • Use of Choquet integrals in multivalued contexts 

      Burusco Juandeaburre, Ana Upna; Alcalde, Cristina (Springer, 2020)   Artículo / Artikulua  OpenAccess
      In this work, multivalued contexts are studied, in which the different observations are related to each other. Continuing the studies already carried out in previous works, the use of Choquet integrals can be an adequate ...
    • Characterization of biomass briquettes from spent coffee grounds and xanthan gum using low pressure and temperature 

      Seco Meneses, Andrés Upna; Espuelas Zuazu, Sandra Upna; Marcelino Sádaba, Sara Upna; Echeverría, Angel María; Prieto Cobo, Eduardo Upna (Springer, 2020)   Artículo / Artikulua
      This paper analyzes the ability of the SCG for briquettes production based on the use of xanthan gum as binder under low-pressure and low-temperature biomass manufacturing conditions. Briquettes were manufactured at room ...
    • Durability of polyester polymer concretes based on metallurgical wastes for the manufacture of construction and building products 

      Seco Meneses, Andrés Upna; Echeverría, Angel María; Marcelino Sádaba, Sara Upna; García, Beñat; Espuelas Zuazu, Sandra Upna (Elsevier, 2020)   Artículo / Artikulua
      Varied target materials can be incorporated into polyester polymer concretes (PPC). This allows natural aggregates to be substituted for different waste products in non-structural polymeric construction and building ...
    • On some classes of directionally monotone functions 

      Bustince Sola, Humberto Upna; Mesiar, Radko; Kolesárová, Anna; Pereira Dimuro, Graçaliz Upna; Fernández Fernández, Francisco Javier Upna; Díaz, Irene; Montes, S. (Elsevier, 2020)   Artículo / Artikulua
      In this work we consider some classes of functions with relaxed monotonicity conditions generalizing some other given classes of fusion functions. In particular, directionally increasing aggregation functions (called also ...
    • Characterization of fresh and cured properties of polymer concretes based on two metallurgical wastes 

      Seco Meneses, Andrés Upna; Echeverría, Angel María; Marcelino Sádaba, Sara Upna; García, Beñat; Espuelas Zuazu, Sandra Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Polyester polymer concretes can substitute conventional concretes based on their usually good mechanical strength, adequate physical properties, and high resistance against aggressive chemical environments. They also show ...
    • Lossy mode resonance sensors based on nanocoated multimode-coreless-multimode fibre 

      Vicente Gómara, Adrián; Santano, Desiree; Zubiate Orzanco, Pablo Upna; Urrutia Azcona, Aitor Upna; Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna (Elsevier, 2020)   Artículo / Artikulua
      In this work it is proved the ability to obtain lossy mode resonances (LMRs) in the transmission spectrum with multimode-coreless-multimode fibre optic structure coated with tin oxide on the coreless segment. The devices ...
    • The sky characterization according to the CIE Standard General Sky: comparative analysis of three classification methods 

      García Ruiz, Ignacio Upna; Blas Corral, María Ángeles de; Torres Escribano, José Luis Upna (Elsevier, 2020)   Artículo / Artikulua
      Since the publication of the standard sky luminance distributions (SSLD) that was consolidated in the ISO 15469:2004(E)/CIE S 011/E:2003, numerous procedures have emerged for the characterization of the sky condition ...
    • Experimental evaluation of distortion in amplitude modulation techniques for parametric loudspeakers 

      San Martín Murugarren, Ricardo Upna; Tello, Pablo; Valencia Leoz, Ana; Marzo Pérez, Asier Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Parametric loudspeakers can generate a highly directional beam of sound, having applications in targeted audio delivery. Audible sound modulated into an ultrasonic carrier will get self-demodulated along the highly directive ...
    • d-Choquet integrals: Choquet integrals based on dissimilarities 

      Bustince Sola, Humberto Upna; Mesiar, Radko; Fernández Fernández, Francisco Javier Upna; Galar Idoate, Mikel Upna; Paternain Dallo, Daniel Upna; Altalhi, A. H.; Pereira Dimuro, Graçaliz Upna; Bedregal, Benjamin; Takáč, Zdenko (Elsevier, 2020)   Artículo / Artikulua
      The paper introduces a new class of functions from [0,1]n to [0,n] called d-Choquet integrals. These functions are a generalization of the 'standard' Choquet integral obtained by replacing the difference in the definition ...
    • Influence of temperature and aging on the thermal contact resistance in thermoelectric devices 

      Rodríguez García, Antonio; Pérez Artieda, Miren Gurutze Upna; Beisti Antoñanzas, Irene; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna (Springer, 2020)   Artículo / Artikulua
      During thermal design in the first phases development, thermoelectric systems, such as thermoelectric generators, the most important parameter affecting the performance is thermal resistance of the components. This paper ...
    • Optimizing energy consumption in transportation: literature review, insights, and research opportunities 

      Corlu, Canan Gunes; Torre, Rocío de la; Serrano Hernández, Adrián Upna; Juan, Ángel Alejandro; Faulín Fajardo, Javier Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      From airplanes to electric vehicles and trains, modern transportation systems require large quantities of energy. These vast amounts of energy have to be produced somewhere—ideally by using sustainable sources—and then ...
    • CFM-BD: a distributed rule induction algorithm for building compact fuzzy models in Big Data classification problems 

      Elkano Ilintxeta, Mikel Upna; Sanz Delgado, José Antonio Upna; Barrenechea Tartas, Edurne Upna; Bustince Sola, Humberto Upna; Galar Idoate, Mikel Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      Interpretability has always been a major concern for fuzzy rule-based classifiers. The usage of human-readable models allows them to explain the reasoning behind their predictions and decisions. However, when it comes to ...
    • Unsupervised fuzzy measure learning for classifier ensembles from coalitions performance 

      Uriz Martín, Mikel Xabier; Paternain Dallo, Daniel Upna; Domínguez Catena, Iris; Bustince Sola, Humberto Upna; Galar Idoate, Mikel Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      In Machine Learning an ensemble refers to the combination of several classifiers with the objective of improving the performance of every one of its counterparts. To design an ensemble two main aspects must be considered: ...
    • Open repository for the evaluation of ransomware detection tools 

      Berrueta Irigoyen, Eduardo Upna; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna; Izal Azcárate, Mikel Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      Crypto-ransomware is a type of malware that encrypts user files, deletes the original data, and asks for ransom to recover the hijacked documents. Several articles have presented detection techniques for this type of ...
    • Enhanced wireless channel estimation through parametric optimization of hybrid ray launching-collaborative filtering technique 

      Casino, Fran; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Falcone Lanas, Francisco Javier Upna; Solanas, Agusti (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      In this paper, an enhancement of a hybrid simulation technique based on combining collaborative filtering with deterministic 3D ray launching algorithm is proposed. Our approach implements a new methodology of data depuration ...
    • Interval subsethood measures with respect to uncertainty for the interval-valued fuzzy setting 

      Pekala, Barbara; Bentkowska, Urszula; Sesma Sara, Mikel Upna; Fernández Fernández, Francisco Javier Upna; Lafuente López, Julio Upna; Altalhi, A. H.; Knap, Maksymilian; Bustince Sola, Humberto Upna; Pintor Borobia, Jesús María Upna (Atlantis Press, 2020)   Artículo / Artikulua  OpenAccess
      In this paper, the problem of measuring the degree of subsethood in the interval-valued fuzzy setting is addressed. Taking into account the widths of the intervals, two types of interval subsethood measures are proposed. ...