Now showing items 21-40 of 185

    • 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. ...
    • 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 ...
    • Control design and stability analysis of power converters: the MIMO generalized bode criterion 

      Samanes Pascual, Javier Upna; Urtasun Erburu, Andoni Upna; Barrios Rípodas, Ernesto Upna; Lumbreras Magallón, David Upna; López Taberna, Jesús; Gubía Villabona, Eugenio Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2020)   Artículo / Artikulua
      Three-phase dynamic systems and multiphase generators are frequently modeled and controlled in the synchronous reference frame. To properly model the cross-coupling terms in this reference frame, complex vector theory and ...
    • 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 ...
    • Common-mode and phase-to-ground voltage reduction in back-to-back power converters with discontinuous PWM 

      Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna; Juankorena Saldias, Xabier Upna; Gironés Remírez, Carlos (IEEE, 2020)   Artículo / Artikulua
      Discontinuous space vector pulsewidth modulation (DSVPWM) techniques are an interesting option for three-phase, two-level power converters when efficiency is a key factor. Such is the case of back-to-back (B2B) power ...
    • Prospects of waste-heat recovery from a real industry using thermoelectric generators: economic and power output analysis 

      Araiz Vega, Miguel Upna; Casi Satrústegui, Álvaro; Catalán Ros, Leyre; Martínez Echeverri, Álvaro; Astrain Ulibarrena, David Upna (Elsevier, 2020)   Artículo / Artikulua
      One of the options to reduce industrial energy costs and the environmental impact is to recover the waste-heat produce in some processes. This paper proposes the use of thermoelectric generators at a stone wool manufacturing ...
    • Terahertz sensing based on metasurfaces 

      Beruete Díaz, Miguel Upna; Jáuregui López, Irati Upna (Wiley, 2020)   Artículo / Artikulua  OpenAccess
      The terahertz (THz) band has very attractive characteristics for sensing and biosensing applications, due to some interesting features such as being a non-ionizing radiation, very sensitive to weak interactions, thus, ...
    • New fractional step Runge-Kutta-Nyström methods up to order three 

      Bujanda Cirauqui, Blanca Upna; Moreta, M. Jesús; Jorge Ulecia, Juan Carlos Upna (Elsevier, 2020)   Artículo / Artikulua
      Fractional Step Runge–Kutta–Nyströ (FSRKN) methods have been revealed to be an excellent option to integrate numerically many multidimensional evolution models governed by second order in time partial differential equations. ...
    • Compact groove diamond antenna in gap waveguide technology with broadband circular polarization at millimeter waves 

      Pérez, Dayan; Torres-García, Alicia Upna; Ederra Urzainqui, Íñigo; Beruete Díaz, Miguel (IEEE, 2020)   Artículo / Artikulua
      In this paper, three compact antennas using the Ridge Gap Waveguide (RGW) technology working in the millimeter-wave band (60 GHz), with a high-purity and broadband circular polarization (CP) are numerically and experimentally ...
    • Remote access protocols for Desktop-as-a-Service solutions 

      Magaña Lizarrondo, Eduardo Upna; Sesma Gracia, Iris Upna; Morató Osés, Daniel Upna; Izal Azcárate, Mikel Upna (Public Library of Science, 2019)   Artículo / Artikulua  OpenAccess
      The use of remote desktop services on virtualized machines is a general trend to reduce the cost of desktop seats. Instead of assigning a physical machine with its operating system and software to each user, it is considerably ...
    • Photonic nanojets with mesoscale high-index dielectric particles 

      Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna (AIP Publishing, 2019)   Artículo / Artikulua  OpenAccess
      In this work, we demonstrate the ability of high-index dielectric particles immersed in air to generate photonic nanojets with extreme resolution (∼0.06λ0). Both 2D (cylindrical) and 3D (spherical) particles are analyzed, ...
    • On the performance of an ENZ-based sensor using transmission line theory and effective medium approach 

      Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna; Rodríguez Ulibarri, Pablo Upna; Engheta, Nader (IOP Publishing, 2019)   Artículo / Artikulua  OpenAccess
      In this paper we perform an in-depth theoretical studyofa sensing platform based on epsilon-near- zero (ENZ) metamaterials. The structure proposed for sensing is a narrow metallic waveguide channel. An equivalent circuit ...
    • Grating lobes in higher-order correlation functions of arrays of quantum emitters: directional photon bunching versus correlated directions 

      Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Ziolkowski, Richard W. (MDPI, 2019)   Artículo / Artikulua  OpenAccess
      Recent advances in nanofabrication and optical manipulation techniques are making it possible to build arrays of quantum emitters with accurate control over the locations of their individual elements. In analogy with ...
    • Heat pipes thermal performance for a reversible thermoelectric cooler-heat pump for a nZEB 

      Aranguren Garacochea, Patricia Upna; Díaz de Garayo, Sergio; Martínez Echeverri, Álvaro Upna; Araiz Vega, Miguel Upna; Astrain Ulibarrena, David Upna (Elsevier, 2019)   Artículo / Artikulua
      The nZEB standards reduce the energy demand of these buildings to a minimum, obtaining this little energy from renewable resources. Taking these aspect into consideration, a thermoelectric cooler-heat pump is proposed to ...
    • Aluminum doped zinc oxide (AZO) coated optical fiber LMR refractometers—An experimental demonstration 

      Ozcariz Celaya, Aritz Upna; Piña-Azamar, Dafne A.; Ruiz Zamarreño, Carlos Upna; Dominguez, René; Arregui San Martín, Francisco Javier Upna (Elsevier, 2019)   Artículo / Artikulua
      This work presents the experimental demonstration of lossy mode resonance generation by means of aluminum doped zinc oxide thin-films. The use of such material may allow to optimize the performance of LMR-based sensors, ...
    • Improving the performance of fuzzy rule-based classification systems based on a nonaveraging generalization of CC-integrals named C-F1F2-integrals 

      Lucca, Giancarlo; Pereira Dimuro, Graçaliz Upna; Fernández Fernández, Francisco Javier Upna; Bustince Sola, Humberto Upna; Bedregal, Benjamin; Sanz Delgado, José Antonio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A key component of fuzzy rule-based classification systems (FRBCS) is the fuzzy reasoning method (FRM) since it infers the class predicted for new examples. A crucial stage in any FRM is the way in which the information ...
    • Far-field and near-field physics of extraordinary THz transmitting hole-array antennas 

      Camacho, Miguel; Boix, Rafael R.; Kuznetsov, Sergei A.; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      Despite three decades of effort, predicting accurately extraordinary transmission through subwavelength hole arrays has proven challenging. The lack of quantitative design and modeling capability to take into account ...
    • A water content continuous monitoring of grapevine xylem tissue using a portable low-power cost-effective FMCW radar 

      Quemada Mayoral, Carlos Upna; García González, Cebrián Upna; Iriarte Galarregui, Juan Carlos Upna; Marín Ederra, Diana Upna; Gastón Beraza, Diego; Miranda Jiménez, Carlos Upna; Gonzalo García, Ramón Upna; Maestrojuán Biurrun, Itziar Upna; Santesteban García, Gonzaga Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      This paper presents the real-time monitoring of a grapevine’s water content that flows up through the xylem tissue by means of a frequency-modulated continuous-wave (FMCW) radar. The application of an optimization process, ...