Enviaments recents

  • Entropy characterisation of overstressed capacitors for lifetime prediction 

    Cuadras Tomàs, Àngel; Romero, Ramón; Ovejas Benedicto, Victòria Júlia (2016-12-30)
    Article
    Accés restringit per política de l'editorial
    We propose a method to monitor the ageing and damage of capacitors based on their irreversible entropy generation rate. We overstressed several electrolytic capacitors in the range of 33 µF–100 µF and monitored their entropy ...
  • An algorithm for beat-to-beat heart rate detection from the BCG based on the continuous spline wavelet transform 

    Alvarado Serrano, Carlos; Luna Lozano, Pablo Samuel; Pallàs Areny, Ramon (2016-05-01)
    Article
    Accés restringit per política de l'editorial
    This work describes an algorithm intended to detect the beat-to-beat heart rate from the ballistocardiogram (BCG) obtained from seated subjects. The algorithm is based on the continuous wavelet transform with splines, which ...
  • Calibration-less direct capacitor-to-microcontroller interface 

    López Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar (Institution of Electrical Engineers, 2016-02-18)
    Article
    Accés obert
    A new technique to measure a capacitor or a capacitive sensor by means of a direct sensor-to-microcontroller interface circuit that does not need a calibration capacitor is proposed. Basically, the measurement process ...
  • A novel method to obtain proximal plethysmographic information from distal measurements using the impedance plethysmogram 

    Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs Areny, Ramon (University of Oslo, 2015-12-23)
    Article
    Accés obert
    We present a novel method to detect proximal volume changes based on the impedance plethysmogram (IPG) measured from limb to limb with two electrode pairs symmetrically placed at distal areas of the upper or the lower ...
  • Design of a low-cost wireless sensor network with UAV mobile node for agricultural applications 

    Polo Cantero, José; Hornero Ocaña, Gemma; Casas Piedrafita, Óscar (2015-11-01)
    Article
    Accés restringit per política de l'editorial
    The aim of the present paper is to propose an agricultural environment monitoring server system utilizing a low-cost Wireless Sensor Network (WSN). Several sensor nodes are scattered in fields several kilometres in size, ...
  • Ballistocardiography and Seismocardiography: A Review of Recent Advances 

    Inan, Omer T; Migeotte, Pierre-François; Park, Kwang-Suk; Etemadi, Mozziyar; Tavakolian, Kouhyar; Casanella Alonso, Ramón; Zanetti, John; Tank, Jens; Funtova, Irina; Prisk, G. Kim; Di Rienzo, Marco (2015-07-01)
    Article
    Accés obert
    In the past decade, there has been a resurgence in the field of unobtrusive cardiomechanical assessment, through advancing methods for measuring and interpreting ballistocardiogram (BCG) and seismocardiogram (SCG) signals. ...
  • Smart lighting system ISO/IEC/IEEE 21451 compatible 

    Higuera Portilla, Jorge Eduardo; Hertog, Wim; Polo Cantero, José; Perálvarez Barrera, Mariano; Carreras Quilis, Josep M. (2015-05-01)
    Article
    Accés obert
    Smart lighting systems go far beyond merely replacing lamps. These modern systems are now able to reproduce arbitrary spectra, color temperatures, and intensities and pivot on smart sensors and actuators incorporating ...
  • A wireless augmentative and alternative communication system for people with speech disabilities 

    Hornero Ocaña, Gemma; Quílez Figuerola, Marcos; Casas Piedrafita, Óscar (Institute of Electrical and Electronics Engineers (IEEE), 2015-08-19)
    Article
    Accés obert
    An augmentative and alternative communication (AAC) device for people with speech disabilities is presented. This AAC system exhibits the advantages of two currently used systems: 1) usability of the communication boards ...
  • Irreversible entropy model for damage diagnosis in resistors 

    Cuadras Tomàs, Àngel; Crisóstomo, Javier; Ovejas Benedicto, Victòria Júlia; Quílez Figuerola, Marcos (American Institute of Physics (AIP), 2015-10-28)
    Article
    Accés obert
    We propose a method to characterize electrical resistor damage based on entropy measurements. Irreversible entropy and the rate at which it is generated are more convenient parameters than resistance for describing damage ...
  • Determination of a System’s Entropy Using Pyroelectric Sensors 

    Cuadras Tomàs, Àngel; Ovejas Benedicto, Victòria Júlia (2015-12)
    Article
    Accés obert
    We propose a system for measuring entropy variations, S, in thermal systems using pyroelectric sensors. These sensors convert time-dependent temperature variations into electrical current. Consequently, heat and ...

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