Now showing items 21-40 of 77

    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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 ...
    • Characteristics and energy dependence of recurrent galactic cosmic-ray flux depressions and of a forbush decrease with LISA Pathfinder 

      Armano, M.; Audley, H.; Baird, J.; Bassan, M.; Benella, S.; Lobo, J.A.; Ramos Castro, Juan José (2018-02-16)
      Article
      Open Access
      Galactic cosmic-ray (GCR) energy spectra observed in the inner heliosphere are modulated by the solar activity, the solar polarity and structures of solar and interplanetary origin. A high counting rate particle detector ...
    • Charge-induced force noise on free-falling test masses: results from LISA pathfinder 

      Armano, M.; Audley, H.; Auger, G.; Baird, J.; Binetruy, P.; Ramos Castro, Juan José (2017-04-26)
      Article
      Open Access
      We report on electrostatic measurements made on board the European Space Agency mission LISA Pathfinder. Detailed measurements of the charge-induced electrostatic forces exerted on free-falling test masses (TMs) inside the ...
    • Comparison of omega wave system and polar S810i to detect R-R intervals at rest 

      Parrado Romero, Eva; García González, Miguel Ángel; Ramos Castro, Juan José; Cervantes Blasquez, Julio Cesar; Rodas Font, Gil; Capdevila Ortis, Lluís (2010)
      Article
      Restricted access - publisher's policy
      The present study was performed to compare R-R interval data and heart rate variability indices obtained from the Polar S810i and the Omega Wave Sport System for a total of 96 adults in a supine position. Data were ...
    • Comparison of video-based methods for respiration rhythm measurement 

      Mateu Mateus, Marc; Guede Fernández, Federico; Ferrer Mileo, Víctor; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (2019-05-01)
      Article
      Restricted access - publisher's policy
      The aim of this work is to characterize the di erences in the respiratory rhythm obtained through three video based methods by comparing the obtained respiratory signals with the one obtained with the gold standard method ...
    • Constraints on LISA pathfinder's self-gravity: design requirements, estimates and testing procedures 

      Armano, M.; Audley, H.; Auger, G.; Baird, J.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Brandt, N.; Bursi, A.; Caleno, M.; Cavalleri, A.; Cesarini, A.; Cruise, M.; Danzmann, K.; Ramos Castro, Juan José (2016-11-08)
      Article
      Open Access
      LISA Pathfinder satellite was launched on 3 December 2015 toward the Sun–Earth first Lagrangian point (L1) where the LISA Technology Package (LTP), which is the main science payload, will be tested. LTP achieves measurements ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Cubesat-based demonstrator for optical Earth observation 

      Jové Casulleras, Roger; Camps Carmona, Adriano José; Ramos Castro, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      This paper introduces UPCSat-1 , the first project of the Universitat Politècnica de Catalunya to build and launch a pico-satellite. Its main scope is to develop, construct, assembly, test and launch into a Low Earth ...
    • Design of the magnetic diagnostics unit onboard LISA Pathfinder 

      Díaz Aguiló, Marc; Mateos, Ignacio; Ramos Castro, Juan José; Lobo, J.A.; García-Berro Montilla, Enrique (2013-04)
      Article
      Open Access
      LISA (Laser Interferometer Space Antenna) is a joint mission of ESA and NASA which aims to be the first space-borne gravitational wave observatory. Due to the high complexity and technological challenges that LISA will ...
    • 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)
      Article
      Restricted access - publisher's policy
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Do ventricular repolarization interval ratios depend on heart rate and should they be rate-corrected? 

      Alvarado Serrano, Carlos; Ramos Castro, Juan José; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2003-09)
      Conference report
      Open Access
      QT interval decreases with increasing heart rate (HR), hence to define normal values of QT interval for different heart rates requires the application of a QT interval rate correction formula. However, the influence of HR ...
    • Driver drowsiness detection based on respiratory signal analysis 

      Guede Fernández, Federico; Fernández Chimeno, Mireya; Ramos Castro, Juan José; García González, Miguel Ángel (Institute of Electrical and Electronics Engineers (IEEE), 2019-06-24)
      Article
      Open Access
      Drowsy driving is a prevalent and serious public health issue that deserves attention. Recent studies estimate around 20% of car crashes have been caused by drowsy drivers. Nowadays, one of the main goals in the development ...
    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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)
      Article
      Open Access
      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 ...
    • Facial video-based photoplethysmography to detect HRV at rest 

      Moreno Sánchez, Jordi; Ramos Castro, Juan José; Movellan, J; Parrado Romero, Eva; Rodas Font, Gil; Capdevila Ortis, Lluís (2015-06-01)
      Article
      Restricted access - publisher's policy
      Our aim is to demonstrate the usefulness of photoplethysmography (PPG) for analyzing heart rate variability (HRV) using a standard 5-min test at rest with paced breathing, comparing the results with real RR intervals and ...
    • Forbush decreases and <2 day GCR flux non-recurrent variations studied with LISA pathfinder 

      Armano, M.; Audley, H.; Baird, J.; Benella, S.; Binetruy, P.; Born, M.; Bortoluzzi, D.; Ramos Castro, Juan José (Institute of Physics (IOP), 2019-04-01)
      Article
      Open Access
      Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n-1 were observed between 2016 February 18 and 2017 July 3 on board the European Space Agency LISA Pathfinder (LPF) mission orbiting ...
    • 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)
      Part of book or chapter of book
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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)
      Conference lecture
      Restricted access - publisher's policy
      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 ...