Recent Submissions

  • 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
    Open Access
    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
    Open Access
    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
    Open Access
    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 ...
  • On bio-activity related signals from contactless electrode measurements 

    Pallàs Areny, Ramon; Casas Piedrafita, Óscar (2015)
    Article
    Open Access
  • A fast method to estimate body capacitance to ground at mid frequencies 

    Aliau Bonet, Carles; Pallàs Areny, Ramon (University of Oslo, 2015-12-18)
    Article
    Open Access
    Impedance measurements that involve the human body are affected by the capacitance between the body and earth ground. This paper describes a fast method to estimate that apacitance at 10 kHz, which is valid for impedance ...
  • Automatic Concealed Heart Rate Detection from the BCG in Seated Position 

    Luna Lozano, P. S.; Pallàs Areny, Ramon (2015-03-01)
    Article
    Open Access
    Continuous monitoring of health state is important in elder and chronically ill (but otherwise not critical) patients. Ideally, the patient should not be aware of being continuously monitored. This study describes an ...
  • Effects of stray capacitance to ground in bipolar material impedance measurements based on direct-contact electrodes 

    Aliau Bonet, Carles; Pallàs Areny, Ramon (2014-10-01)
    Article
    Restricted access - publisher's policy
    Bipolar material impedance measurements are easier to implement than tetrapolar measurements but are more affected by electrode impedance. This effect can be reduced by measuring at a high-enough frequency albeit with the ...
  • Redes inalámbricas de sensores en aplicaciones agroambientales 

    Pallàs Areny, Ramon; Casas Piedrafita, Óscar (2014)
    Article
    Restricted access - publisher's policy
    Muchas de las aplicaciones actuales de la electrónica dependen de sensores que obtienen las señales necesarias para monitorizar o controlar procesos de índole tan variada como el número de vehículos en un aparcamiento o ...
  • Noise reduction in AC-coupled amplifiers 

    Serrano Finetti, Roberto Ernesto; Pallàs Areny, Ramon (2014-07-01)
    Article
    Restricted access - publisher's policy
    AC-coupled amplifiers are noisier than dc-coupled amplifiers because of the thermal noise of the resistor(s) in the ac-coupling network and the increased contribution of the amplifier input noise current i(n). Both ...
  • Towards the standardization of ballistocardiography systems for J-peak timing measurement 

    Gómez Clapers, Joan; Serra Rocamora, Albert; Casanella Alonso, Ramón; Pallàs Areny, Ramon (2014-09-16)
    Article
    Open Access
    There is a growing interest in accurately measuring the timing of the J peak of the ballistocardiogram (BCG) in order to obtain cardiovascular function markers non-invasively, especially in modern home healthcare applications. ...

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