Ara es mostren els items 1-20 de 39

  • Accuracy of heart rate variability estimation by photoplethysmography using an smartphone : processing optimization and fiducial point selection 

    Ferrer Mileo, Víctor; Guede Fernández, Federico; Fernández Chimeno, Mireya; Ramos Castro, Juan José; García González, Miguel Ángel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    This work compares several fiducial points to detect the arrival of a new pulse in a photoplethysmographic signal using the built-in camera of smartphones or a photoplethysmograph. Also, an optimization process for ...
  • A comparison of heartbeat detectors for the seismocardiogram 

    García González, Miguel Ángel; Argelagós Palou, Ariadna; Fernández Chimeno, Mireya; Ramos Castro, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    The study aimed to study the accuracy in RR time series derived from the seismocardiogram when employing different heartbeat detectors in subjects measured in a quiet environment. The ECG and seismocardiogram of 17 healthy ...
  • A comprehensive model for power line interference in biopotential measurements 

    Fernández Chimeno, Mireya; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2000-06-30)
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    Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are ...
  • A methodology to quantify the differences between alternative methods of heart rate variability measurement 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Guede Fernández, Federico; Ferrer Mileo, Víctor; Argelagós Palou, Ariadna; Álvarez Gómez, Laura; Parrado Romero, Eva; Moreno Sánchez, Jordi; Capdevila, Lluis; Ramos Castro, Juan José (Institute of Physics (IOP), 2015-12-14)
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    This work proposes a systematic procedure to report the differences between heart rate variability time series obtained from alternative measurements reporting the spread and mean of the differences as well as the agreement ...
  • An application of fractional differintegration to heart rate variability time series 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José; Capdevila, Lluis; Parrado, Eva (2013-07)
    Article
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    Fractional differintegration is used as a new tool to characterize heart rate variability time series. This paper proposes and focuses in two indexes (ac and fnQ) derived from the fractional differintegration operator. ...
  • A new and fast index for the quantification of short range self-similarity in RR time series 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (2010)
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    We propose a new and very fast index (the frequency of sign changes of the mirrored differences or fscmd) with good correlation with the short range scaling exponent (  R) estimated among scales 4 to 16 of the DFA. ...
  • A novel index based on fractional calculus to assess the dynamics of heart rate variability: changes due to chi or yoga meditations 

    García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (Computing in Cardiology, 2012)
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    The study aims to present and interpret a novel index based on fractional calculus ( αc) and to assess differences in RR time series dynamics in subjects during meditation. Fractional differintegration (FDI) of a RR time ...
  • Assessment of energy expended in physical activity by a smartphone-based system 

    Guede Fernández, Federico; Carbones Fargas, Bernat; Capdevila Ortis, Lluís; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (Springer, 2014)
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    The aim of this paper is to present a smartphone based system to assess daily energy expended in physical activ- ity (PA). Nowadays, sedentary li festyle is increasingly recog- nized as a serious, worldwide public ...
  • Car windshield behavior transient analysis by FDTD 

    Jauregui Tellería, Ricardo; Pous Solà, Marc; Vives, Yolanda; Fernández Chimeno, Mireya; Riu Costa, Pere Joan; Silva Martínez, Fernando (2009-06)
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    The present article studies the influence of a car heatable windshield by means of an equivalent material that allows an appropriate meshing of the vehicle. This study has been performed analyzing the propagation of an ...
  • Changes in heart rate variability indexes due to drowsiness in professional drivers measured in a real environment 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (Computing in Cardiology, 2012)
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    The study aims to assess the changes in Heart Rate Variability (HRV) indexes in healthy subjects whi le driving in a real environment in order to detect drowsiness. The ECG of ten professional drivers was acquired ...
  • Contactless electrical bioimpedance system for monitoring ventilation. A biodevice for vehicle environment 

    Macías Macías, Raúl; García González, Miguel Ángel; Ramos Castro, Juan José; Bragós Bardia, Ramon; Fernández Chimeno, Mireya (SciTePress, 2013)
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    Nowadays, automotive companies are focused in improving road traffic safety. For that, not only the vehicle performance is improved but also the driver behavior is monitored. This could be done in many ways. One of them ...
  • Development of a system to test somnolence detectors with drowsy drivers 

    Lopez De la O, Jaime; Rodriguez Ibañez, Noelia; Nombela, Mario; Barrios, Jose Manuel; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (2012)
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  • Differences in QRS locations due to ECG lead: relationship with breathing 

    García González, Miguel Ángel; Argelagós Palou, Ariadna; Fernández Chimeno, Mireya; Ramos Castro, Juan José (2013)
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    Results of heart rate variability analysis depend on the accuracy of the RR time series that is measured only in one lead of the ECG. RR time series can subtly change from lead to lead. We have obtained the ECG of 21 healthy ...
  • Drowsiness detection by thoracic effort signal analysis in real driving environments 

    Rodriguez Ibáñez, Noelia; García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (2011)
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    Detection of drowsiness while driving is a leading objective in advanced driver assistance systems. This work presents a new index to assess the alertness state of drivers based on the respiratory ...
  • Drowsiness detection by thoracic effort signal snalysis with professional drivers in real environments 

    Rodriguez Ibañez, Noelia; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (2011)
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    Objective : The aim of this work is to develop a new index to assess the alertness state of drivers based on the respiratory dynamics derived f rom an inductive band. Background : Detection of drowsiness while driving ...
  • Estimation of the uncertainty in time domain indices of RR time series 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-03-31)
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    A method for estimating the uncertainty in time-domain indices of RR time series is described. The method relies on the central limit theorem that states that the distribution of a sample average of independent samples has ...
  • Gold standard generation using electrooculogram signal for drowsiness detection in simulator conditions 

    Rodríguez Ibáñez, Noelia; Meca-Calderón, Pablo; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (Springer, 2014-11-02)
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  • Heart rate variability analysis using a seismocardiogram signal 

    Ramos Castro, Juan José; Moreno, J.; Miranda-Vidal, H.; García González, Miguel Ángel; Fernández Chimeno, Mireya; Rodas, G.; Capdevila, L. (IEEE, 2012)
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    Seismocardiography is a simple and non invasive method of recording cardiac activity fro m the movements of the body caused by heart pumping. In this preliminary study we use a smartphone to record this acceleration and ...
  • Initial analysis of SAR from a cell phone inside a vehicle by numerical computation. 

    Anzaldi, Gabriel; Silva Martínez, Fernando; Fernández Chimeno, Mireya; Quílez Figuerola, Marcos; Riu Costa, Pere Joan (Institution of Electrical and Electronics Engineers, 2007-05-31)
    Article
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    The purpose of this paper is to analyze the influence of the metallic structures of a realistic car body frame on the specific absorption rate (SAR) produced by a cell phone when a complete human body model is placed at ...
  • Mobile phones electromagnetic interference in medical environments: a review 

    Fernández Chimeno, Mireya; Silva Martínez, Fernando (2010)
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    This paper presents a review of the effect of electromagnetic interferences of mobile phones in medical environment. The review is focussed in two areas, EMI in implantable devices like pacemakers or ICD, and EMI in ...