Now showing items 1-20 of 100

    • 3Cat-1 project: a multi-payload CubeSat for scientific experiments and technology demonstrators 

      Jové Casulleras, Roger; Araguz López, Carles; Via Ortega, Pol; Solanellas Bofarull, Arnau; Amézaga Sarries, Adrià; Vidal Mateu, David; Muñoz Martin, Joan Francesc; Marí Barceló, Marc; Olivé Muñiz, Roger; Sáez Hernández, Alberto; Jané Abad, Jaume; Bou Balust, Elisenda; Iannazzo Soteras, Mario Enrique; Gorreta Mariné, Sergio; Ortega Villasclaras, Pablo Rafael; Pons Nin, Joan; Domínguez Pumar, Manuel; Alarcón Cot, Eduardo José; Ramos Castro, Juan José; Camps Carmona, Adriano José (2017)
      Article
      Open Access
      This article introduces 3 Cat-1, the first project of the Technical University of Catalonia to build and launch a nano-satellite. Its main scope is to develop, construct, assemble, test and launch into a low Earth orbit a ...
    • 3Cat-1: a multi-payload Cubesat-based scientific and technology demonstrator 

      Jové Casulleras, Roger; Camps Carmona, Adriano José; Ramos Castro, Juan José; Alarcón Cot, Eduardo José; Bou Balust, Elisenda; Carreño Luengo, Hugo; Amézaga Sarries, Adrià; Olivé Muñiz, Roger; Vidal Mateu, David; Muñoz Martin, Joan Francesc; Araguz López, Carles; Marí Barceló, Marc; Ortega Villasclaras, Pablo Rafael; Pons Nin, Joan; Gorreta Mariné, Sergio; Domínguez Pumar, Manuel; Iannazzo Soteras, Mario Enrique (European Spatial Agengy (ESA), 2014)
      Conference lecture
      Open Access
    • 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)
      Conference lecture
      Open Access
      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 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)
      Article
      Open Access
      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 ...
    • 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)
      Conference lecture
      Open Access
      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 non-contact camera-based method for respiratory rhythm extraction 

      Mateu Mateus, Marc; Guede Fernández, Federico; Rodriguez Ibañez, Noelia; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (2021-04)
      Article
      Open Access
      The aim of this work is to present a non-contact video-based method for respiratory rhythm extraction. The method makes use of a consumer-grade RGB camera, and it is based on computer vision algorithms to detect and track ...
    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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 ...
    • A photoplethysmography smartphone-based method for heart rate variability assessment: device model and breathing influences 

      Guede Fernández, Federico; Ferrer Mileo, Víctor; Mateu Mateus, Marc; Ramos Castro, Juan José; García González, Miguel Ángel; Fernández Chimeno, Mireya (2020-03)
      Article
      Open Access
      A measurement method of heart rate and heart rate variability (HRV) based on smartphone has been developed and validated. The method is based on photoplethysmography (PPG) acquired with the smartphone camera (SPPG). SPPG ...
    • A serious game to self-regulate heart rate variability as a technique to manage arousal level through cardiorespiratory biofeedback: development and pilot evaluation study 

      Estrella Arraez, Toni; Alfonso Martín, Carla; Ramos Castro, Juan José; Alsina Rodriguez, Aitor; Capdevila, Lluis (JMIR, 2023-08-24)
      Article
      Open Access
    • A wireless sensor network design for the Help4Mood european project 

      Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Castro Robles, Joan Carles (VDE Conference Publications, 2012)
      Conference report
      Restricted access - publisher's policy
      Help4Mood is a closed loop approach supporting the control, communication and treatment management of patients with Major Depression. The first out of the three main components of the Help4Mood solution is the Personal ...
    • A wireless under-mattress sensor system for sleep monitoring in people with major depression 

      Mahdavi, Hadiseh; Ramos Castro, Juan José; Giovinazzo, Giuseppe; García González, Miguel Ángel; Rosell Ferrer, Francisco Javier (2012)
      Conference report
      Restricted access - publisher's policy
      Monitoring people during sleep time is of particular interest to patients with sleep disorders and elderly people or infants. We have developed a battery powered electronic system to monitor people in the bed, store the ...
    • Acceleration and drift reduction of MOX gas sensors using active sigma-delta controls based on dielectric excitation 

      Solà Peñafiel, Nil; Manyosa i Vilardell, Xavier; Navarrete Gatell, Eric; Ramos Castro, Juan José; Jiménez Serres, Vicente; Bermejo Broto, Sandra; García, Isabel; Llobet Valero, Eduard; Domínguez Pumar, Manuel (2022-08-15)
      Article
      Restricted access - publisher's policy
      The objective of this paper is to apply a closed-loop control based on dielectric excitation to MOX gas sensors in order to improve their response time. The control implements a feedback loop in which temperature modulations ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Agreement between two photoplethysmography-based wearable devices for monitoring heart rate during different physical activity situations: a new analysis methodology 

      Alfonso, Carla; García González, Miguel Ángel; Parrado, Eva; Gil Rojas, Jessyca; Ramos Castro, Juan José; Capdevila, Lluis (Nature, 2022-09-14)
      Article
      Open Access
      Wearables are being increasingly used to monitor heart rate (HR). However, their usefulness for analyzing continuous HR in research or at clinical level is questionable. The aim of this study is to analyze the level of ...
    • 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
      Restricted access - publisher's policy
      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. ...
    • Analysis of gender differences in hrv of patients with myalgic encephalomyelitis/chronic fatigue syndrome using mobile-health technology 

      Capdevila Ortis, Lluís; Castro Marreno, Jesús; Alegre Martín, José; Ramos Castro, Juan José; Escorihuela, Rosa María (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-28)
      Article
      Open Access
      In a previous study using mobile-health technology (mHealth), we reported a robust association between chronic fatigue symptoms and heart rate variability (HRV) in female patients with myalgic encephalomyelitis/chronic ...
    • Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder 

      Armano, M.; Audley, H.; Baird, J.; Ramos Castro, Juan José (2020-04-01)
      Article
      Open Access
      The Laser Interferometer Space Antenna Pathfinder (LPF) main observable, labeled ¿g, is the differential force per unit mass acting on the two test masses under free fall conditions after the contribution of all non-gravitational ...
    • Análisis de la variabilidad de la frecuencia cardíaca mediante fotopletismografía por imagen 

      Melchor Rodríguez, Angel; Ramos Castro, Juan José (2014)
      Conference lecture
      Open Access
      La Variabilidad de la Frecuencia Cardíaca (VFC) es un parámetro fisiológico que en las últimas décadas ha tomado mayor importancia por su implicación con el sistema nervioso autónomo y su relación con los trastornos ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Automatic detection of ECG ventricular activity waves using continuous spline wavelet transform 

      Alvarado Serrano, Carlos; Arregui, J.; Ramos Castro, Juan José; Pallàs-Areny, Ramon (2005)
      Conference report
      Open Access
      In this study, we present detection algorithms of characteristic points of the QRS and T waves based on the continuous wavelet transform (CWT) with splines. This technique can handle any integer scale and the analysis is ...