Recent Submissions

  • Low-voltage 0.81mW, 1-32 CMOS VGA with 5% bandwidth variations and -38dB DC rejection 

    López Martín, Antonio Upna; Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; Rocha-Pérez, José Miguel; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on the cascade of a wide linear input range OTA, an op-amp and a servo-loop with extremely large time ...
  • 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 ...
  • 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) ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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. ...
  • 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 ...
  • 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: ...
  • Trend analysis in L-fuzzy contexts with absent values 

    Alcalde, Cristina; Burusco Juandeaburre, Ana Upna; Bustince Sola, Humberto Upna; Sesma Sara, Mikel Upna (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 ...
  • On admissible orders over closed subintervals of [0,1] 

    Santana, Fagner; Bedregal, Benjamin; Viana, Petrucio; Bustince Sola, Humberto Upna (Elsevier, 2020)   Artículo / Artikulua
    In this paper, we make some considerations about admissible orders on the set of closed subintervals of the unit interval I[0,1], i.e. linear orders that refine the product order on intervals. We propose a new way to ...
  • A strategic multistage tactical two-stage stochastic optimization model for the airline fleet management problem 

    Serrano Hernández, Adrián Upna; Cadarso, Luis; Faulín Fajardo, Javier Upna (Elsevier, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    This work proposes stochastic optimization for the airline fleet management problem, considering uncertainty in the demand, operational costs, and fares. In particular, a multistage tree is proposed, compounded of strategic ...
  • Coping with stress in emergency department physicians through improved patient-flow management 

    Cildoz Esquíroz, Marta Upna; Ibarra, Amaia; Mallor Giménez, Fermín Upna (Elsevier, 2020)   Artículo / Artikulua  OpenAccess
    This paper provides a method for the real-time monitoring of job stress in emergency department (ED) physicians. It is implemented in a Decision Support System (DSS) designed for patient-to-physician assignment after triage. ...
  • 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 ...
  • AC/DC millivoltage sensor by means of ITO-coated optical fibers: towards monitoring of biosignals 

    Aginaga Etxamendi, Concepción Isabel; Socorro Leránoz, Abián Bentor Upna; Fuentes Lorenzo, Omar; Del Villar, Ignacio Upna; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    This contribution shows the monitoring of AC and DC millivoltage signals by means of lossy mode resonances generated by Indium Tin Oxide (ITO) on optical fibers. Sensors were obtained by sputtering ITO thin-films onto 25 ...
  • Hydrogen educational activities developed by APERNA: a renewable-energy student association 

    Berrueta Irigoyen, Alberto Upna; San Martín Biurrun, Idoia Upna; Samanes Pascual, Javier Upna; Pascual Miqueleiz, Julio María Upna; Barrios Rípodas, Ernesto Upna; Parra Laita, Íñigo de la Upna; Urtasun Erburu, Andoni Upna; Sanchís Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (Asociación Española del Hidrógeno, 2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    In this paper, we present APERNA, a recently-created student association at Public University of Navarre (UPNA) with the aim of promotion of renewable energies.
  • 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 ...

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