Now showing items 1-20 of 56

    • AC/DC millivoltage sensor by means of ITO-coated optical fibers: towards monitoring of biosignals 

      Aginaga Etxamendi, Concepción Isabel Upna; Socorro Leránoz, Abián Bentor Upna; Fuentes Lorenzo, Omar Upna; 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 ...
    • Active damping based on the capacitor voltage positive-feedback for grid-connected power converters with LCL filter 

      Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      The capacitor voltage positive-feedback is a widely extended active damping strategy. It can effectively damp the LCL output filter resonant poles for low ratios of resonance to sampling frequencies. However, the existing ...
    • Analysis of the main battery characterization techniques and experimental comparison of commercial 18650 Li-ion cells 

      Soto Cabria, Adrián Upna; Berrueta Irigoyen, Alberto Upna; Sanchis Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Over the coming years, major growth in the use of Li-ion batteries is expected, both in electric mobility as well as in stationary applications, be it in self-consumption systems and micro grids or in large renewable power ...
    • A biased-randomized learnheuristic for solving the team orienteering problem with dynamic rewards 

      Reyes-Rubiano, Lorena Silvana; Juan, Ángel Alejandro; Bayliss, C.; Panadero, J.; Faulín Fajardo, Javier Upna; Copado, P. (Elsevier, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper we discuss the team orienteering problem (TOP) with dynamic inputs. In the static version of the TOP, a fixed reward is obtained after visiting each node. Hence, given a limited fleet of vehicles and a threshold ...
    • Characterization and capacity dispersion of lithium-ion second-life batteries from electric vehicles 

      Braco Sola, Elisa Upna; San Martín Biurrun, Idoia Upna; Sanchis Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Nowadays, electric vehicle batteries reutilization is considered such as a feasible alternative to recycling, as it allows to benefit from their remaining energy and to enlarge their lifetime. Stationary applications as ...
    • Characterization of 3D-printed choke horn antenna for 5G backhaul applications 

      Biurrun Quel, Carlos Upna; Lacombe, Elsa; Gianesello,Frederic; Luxe, Cyril; Río Bocio, Carlos del Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The 200 and 320 GHz frequency band constitutes an interesting window with approximately constant attenuation, which could potentially have applications in the area of ultrahigh-capacity wireless links. The user's demand ...
    • Comparison of fourth-harmonic and combined doubler/subharmonic mixer with integrated MMIC based local oscillator 

      Pérez Escudero, José Manuel Upna; Quemada Mayoral, Carlos Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      In this paper a comparison between a fourth harmonic mixer and a combined doubler/subharmonic mixer based on Schottky diodes working at 300 GHz with MMIC Local Oscillator (LO) integrated in a single enclosing is presented. ...
    • Critical comparison of energy management algorithms for lithium-ion batteries in renewable power plants 

      Berrueta Irigoyen, Alberto Upna; Soto Cabria, Adrián Upna; García Solano, Miguel Upna; Parra Laita, Íñigo de la Upna; Sanchis Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Lithium-ion batteries are gaining importance for a variety of applications due to their price decrease and characteristics improvement. A good energy management strategy is required in order to increase the profitability ...
    • DC capacitance reduction in three-phase photovoltaic inverters by using virtual impedance emulation 

      Urtasun Erburu, Andoni Upna; Sanchis Gúrpide, Pablo Upna; Marroyo Palomo, Luis Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      DC voltage regulation in grid-connected three-phase PV inverters is a fundamental requirement. In order to reduce the influence of the PV non-linear behavior and ensure stability in the whole operating range, the input ...
    • Description and properties of curve-based monotone functions 

      Sesma Sara, Mikel Upna; Miguel Turullols, Laura de Upna; Roldán López de Hierro, Antonio F.; Špirková, Jana; Mesiar, Radko; Bustince Sola, Humberto Upna (Springer, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Curve-based monotonicity is one of the lately introduced relaxations of monotonicity. As directional monotonicity regards monotonicity along fixed rays, which are given by real vectors, curve-based monotonicity studies the ...
    • Design of a groove gap waveguide to microstrip inline transition 

      Pérez Escudero, José Manuel Upna; Torres García, Alicia E. Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper the design of an inline transition between microstrip and groove gap waveguide operating at Wband is presented. The transition consists of two sections: a tapered microstrip line and a Chebyshev transformer. ...
    • Detection of ethanol in human breath using optical fiber long period grating coated with metal-organic frameworks 

      Acha Morrás, Nerea de Upna; Hromadka, Jiri; Tokay, Begum; Correia, Ricardo; Elosúa Aguado, César Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Morgan, Stephen P.; Korposh, Sergiy (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested ...
    • Determining an optimal area to locate a biorefinery under economic and environmental criteria 

      Serrano Hernández, Adrián Upna; Faulín Fajardo, Javier Upna; Pintor Borobia, Jesús María Upna; Belloso Ezcurra, Javier Upna (Elsevier BV, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Facilities location is a strategic decision which has to be carefully considered because it could involve the failure or success of a business. For that reason, anything that helps decision makers to facilitate their ...
    • Directions of directional, ordered directional and strengthened ordered directional increasingness of linear and ordered linear fusion operators 

      Sesma Sara, Mikel Upna; Marco Detchart, Cedric Upna; Lafuente López, Julio Upna; Roldán, Antonio; Mesiar, Radko; Bustince Sola, Humberto Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work we discuss the forms of monotonicity that have been recently introduced to relax the monotonicity condition in the definition of aggregation functions. We focus on directional, ordered directional and strengthened ...
    • Do we still need fuzzy classifiers for Small Data in the Era of Big Data? 

      Elkano Ilintxeta, Mikel Upna; Bustince Sola, Humberto Upna; Galar Idoate, Mikel Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      The Era of Big Data has forced researchers to explore new distributed solutions for building fuzzy classifiers, which often introduce approximation errors or make strong assumptions to reduce computational and memory ...
    • Dual-probe linearly-configured BOCDA system with enlarged modulation amplitude 

      Mariñelarena Ollacarizqueta, Jon Upna; Kim, Yong Hyun; Loayssa Lara, Alayn Upna; Song, Kwang Yong (Optical Society of America, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We present and experimentally demonstrated a linearly-configured Brillouin optical correlation domain analysis (LC-BOCDA) system that allows large modulation amplitude (Δf) based on a dual probe wave and the control of ...
    • Economic analysis of residential PV self-consumption systems with Li-ion batteries under different billing scenarios 

      Galilea Gil, Carlos Upna; Pascual Miqueleiz, Julio María Upna; Berrueta Irigoyen, Alberto Upna; Ursúa Rubio, Alfredo Upna; Marroyo Palomo, Luis Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
      In this paper, an economic analysis for four houses with a PV self-consumption system with and without Li-ion batteries is carried out. In particular three different ways of sizing PV and batteries are analyzed under three ...
    • Effective analysis of secure web response time 

      López Romera, Carlos Upna; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna; Izal Azcárate, Mikel Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The measurement of response time in web based applications is a common task for the evaluation of service responsiveness and the detection of network or server problems. Traffic analysis is the most common strategy for ...
    • Energy harvesting approaches in IoT scenarios with very low ambient energy 

      López Martín, Antonio Upna; Algueta-Miguel, Jose M. Upna; Matías Maestro, Ignacio Upna (European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The feasibility of multi-source energy harvesting in Internet of Things (IoT) scenarios with low and intermittent ambient energy is addressed. As a relevant case study, application to a smart cargo container system is ...
    • Evolution of L-fuzzy contexts associated with criteria 

      Alcalde, Cristina; Burusco Juandeaburre, Ana Upna (Springer, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper will delve deeper into the general study of the L-fuzzy contexts associated with criteria analyzing situations with a known evolution over time. These criteria may be independent or dependent on each other. We ...