Now showing items 1-20 of 100

    • Low cost gaze estimation: knowledge-based solutions 

      Martinikorena Aranburu, Ion Upna; Larumbe Bergera, Andoni Upna; Ariz Galilea, Mikel Upna; Porta Cuéllar, Sonia Upna; Cabeza Laguna, Rafael Upna; Villanueva Larre, Arantxa Upna (IEEE, 2020)   Artículo / Artikulua
      Eye tracking technology in low resolution scenarios is not a completely solved issue to date. The possibility of using eye tracking in a mobile gadget is a challenging objective that would permit to spread this technology ...
    • Design and empirical validation of a Bluetooth 5 fog computing based industrial CPS architecture for intelligent industry 4.0 shipyard workshops 

      Fraga Lamas, Paula; López Iturri, Peio Upna; Celaya Echarri, Mikel; Blanco Novoa, Óscar; Azpilicueta Fernández de las Heras, Leyre Upna; Varela Barbeito, José; Falcone Lanas, Francisco Javier Upna; Fernández Caramés, Tiago M. (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      Navantia, one of largest European shipbuilders, is creating a fog computing based Industrial Cyber-Physical System (ICPS) for monitoring in real-time its pipe workshops in order to track pipes and keep their traceability. ...
    • High-gain metasurface in polyimide on-chip antenna based on CRLH-TL for sub-terahertz integrated circuits 

      Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (Nature Research, 2020)   Artículo / Artikulua  OpenAccess
      This paper presents a novel on-chip antenna using standard CMOS-technology based on metasurface implemented on two-layers polyimide substrates with a thickness of 500 μm. The aluminium ground-plane with thickness of 3 μm ...
    • Vertically coupled InP/InGaAsP microring lasers using a single epitaxial growth and singleside lithography 

      García López, Óscar; Thourhout, Dries Van; Verstuyft, Steven; López-Amo Sáinz, Manuel Upna; Baets, Roel; Galarza Galarza, Marko Upna (IEEE, 2020)   Artículo / Artikulua
      The experimental demonstration of vertical microring lasers requiring only one single epitaxial growth and two single-side lithographic steps is presented, in what is the simplest fabrication scheme for such devices published ...
    • Generation of lossy mode resonances with different nanocoatings deposited on coverslips 

      Fuentes Lorenzo, Omar Upna; 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 ...
    • Lossy mode resonance sensors based on nanocoated multimode-coreless-multimode fibre 

      Vicente Gómara, Adrián Upna; Santano, Desiree Upna; 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 ...
    • Revealing the underlying mechanisms behind TE extraordinary THz transmission 

      Freer, Suzanna; Camacho, Miguel; Kuznetsov, Sergei A.; Boix, Rafael R.; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna (Chinese Laser Press, 2020)   Artículo / Artikulua  OpenAccess
      Transmission through seemingly opaque surfaces, so-called extraordinary transmission, provides an exciting plat- form for strong light–matter interaction, spectroscopy, optical trapping, and color filtering. Much ofthe ...
    • 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) ...
    • 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 ...
    • Power efficient simple technique to convert a reset-and-hold into a true-sample-and-hold using an auxiliary output stage 

      Rico Aniles, Héctor Daniel; Ramírez Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón; Rocha Pérez, José Miguel; Garde Luque, María Pilar Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A technique to implement true-sample-and-hold circuits that hold the output for almost the entire clock cycle without resetting to zero is introduced, alleviating the slew rate requirement on the op-amp. It is based on a ...
    • A compact wide bandpass filter for satellite communications with improved out-of-band rejection 

      Ahmed, Badiaa Ait; Naghar, Azzeddin; Aghzout, Otman; Vazquez Alejos, Ana; Falcone Lanas, Francisco Javier Upna (AEM, 2020)   Artículo / Artikulua  OpenAccess
      This paper presents a compact C-band bandpass filter with improved out-of-band rejection. It consists of a symmetric three-pole parallel coupled line microstrip loaded with complementary split ring resonators (CSRRs) and ...
    • 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 Upna (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 ...
    • 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; Sanchis Gúrpide, Pablo Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      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 ...
    • High-power filter design in waveguide technology: future generation of waveguide satellite filters in payloads handling increasing bit rates and numbers of channels 

      Arregui Padilla, Iván Upna; Teberio Berdún, Fernando Upna; Arnedo Gil, Israel Upna; Percaz Ciriza, Jon Mikel Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna (IEEE, 2020)   Artículo / Artikulua
      To design a filter for a particular application, many issues must first be considered. Which technology will be the most convenient? What design technique will provide better results for a particular set of frequency ...
    • Electric discharge detection and localization using a distributed optical fiber vibration sensor 

      Costa, Igor Brutkowski Vieira da; Weber, Guilherme Heim; Gomes, Danilo Fernandes; Galvão, José Rodolfo; Silva, Marco J. da; Pipa, Daniel R.; Ozcariz Celaya, Aritz Upna; Ruiz Zamarreño, Carlos Upna; Martelli, Cicero; Silva, Jean Carlos Cardozo da (Elsevier, 2020)   Artículo / Artikulua
      Partial discharges are a type of electric discharge that cause localized breakdowns in a small portion of an insulating material without forming a complete rupture. In high power electric machines as well as in transmission ...
    • Tripod-loop metasurfaces for terahertz-sensing applications: a comparison 

      Jáuregui-López, Irati Upna; Orazbayev, Bakhtiyar Upna; Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      The high electric field intensity achieved on the surface of sensors based on metasurfaces (metasensors) makes them an excellent alternative for sensing applications where the volume of the sample to be identified is tiny ...
    • Robust multisampled capacitor voltage active damping for grid-connected power converters 

      Samanes Pascual, Javier Upna; Urtasun Erburu, Andoni Upna; Gubía Villabona, Eugenio Upna; Petri, Alberto (Elsevier, 2019)   Artículo / Artikulua
      The derivative feedback of the capacitor voltage is one of the most extended active damping strategies, used to eliminate stability problems in grid-connected power converters with an LCL filter. This strategy is equivalent ...
    • 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, ...