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    Design of the magnetic diagnostics unit onboard LISA pathfinder  Open access

     Mateos, Ignacio; Diaz Aguiló, Marc; Ramos Castro, Juan Jose; Lobo, J.A.; Garcia-berro Montilla, Enrique
    Aerospace science and technology
    Date of publication: 2013-04
    Journal article

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    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 face, ESA decided to launch a technological demonstrator, LISA Pathfinder. The payload of LISA Pathfinder is the so-called LISA Technology Package, and will be the highest sensitivity geodesic explorer flown to date. The LISA Technology Package is designed to measure relative accelerations between two test masses in nominal free fall (geodesic motion). The magnetic, thermal and radiation disturbances affecting the payload are monitored and dealt by the diagnostics subsystem. The diagnostics subsystem consists of several modules, and one of these is the magnetic diagnostics unit. Its main function is the assessment of differential acceleration noise between test masses due to the magnetic effects. To do so, it has to determine the magnetic characteristics of the test masses, namely their magnetic remanences and susceptibilities. In this paper we show how this can be achieved to the desired accuracy. (c) 2012 Elsevier Masson SAS. All rights reserved.

    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 face, ESA decided to launch a technological demonstrator, LISA Pathfinder. The payload of LISA Pathfinder is the so-called LISA Technology Package, and will be the highest sensitivity geodesic explorer flown to date. The LISA Technology Package is designed to measure relative accelerations between two test masses in nominal free fall (geodesic motion). The magnetic, thermal and radiation disturbances affecting the payload are monitored and dealt by the diagnostics subsystem. The diagnostics subsystem consists of several modules, and one of these is the magnetic diagnostics unit. Its main function is the assessment of differential acceleration noise between test masses due to the magnetic effects. To do so, it has to determine the magnetic characteristics of the test masses, namely their magnetic remanences and susceptibilities. In this paper we show how this can be achieved to the desired accuracy.

  • The help4mood wearable sensor network for inconspicuous activity measurement

     Pérez Diaz de Cerio, David; Ruiz Boque, Silvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan Jose; Valenzuela Gonzalez, Jose Luis; Colomé Castellví, Josep Maria
    IEEE Wireless communications
    Date of publication: 2013-08
    Journal article

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    The Help4Mood EU FP7 project (H4M) [1] proposes to significantly advance the state-ofthe-art in computerized support for people with Major Depression by monitoring mood, physical activity and voice characteristics while promoting activities in reaction to examined inputs. Employing actigraphy can provide supplementary data about patients with depression. Nonetheless, its use is not standardized and there is a lack of public analyses about treated patients with depression using this technique, which is the objective of the project. The purpose of the Personal Monitoring System (PMS) used in H4M is to compile objective data about the changes and trends of activity patterns during long periods of time. This would comprise daily activity, rest time and, if possible, sleep quality. The PMS uses inconspicuous methods but keeping the cost associated with sensor installation at the patient¿s home to a minimum. This work focuses on the Wireless Sensor Network (WSN) enhancements introduced after real testbeds and considering User Quality of Experience (QoE), mainly oriented to reduce energy consumption and required data transmission and consequently improving the autonomy and range of the sensors.

  • Contactless electrical bioimpedance system for monitoring ventilation. A biodevice for vehicle environment

     Macias Macias, Raul; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Bragos Bardia, Ramon; Fernandez Chimeno, Mireya
    International Conference on Biomedical Electronics and Devices
    Presentation's date: 2013-02
    Presentation of work at congresses

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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 is to monitor a specific physiological parameter using a biodevice. That device should be reliable enough to use in a very noisy environment like a vehicle is. Furthermore, because long-term monitoring is required, any invasive and annoying method should be avoided. Therefore, an electrical bioimpedance device capable of monitoring driver ventilation using several textiles electrodes has been designed and implemented.

  • Differences in QRS locations due to ECG lead: relationship with breathing

     Garcia Gonzalez, Miquel Angel; Argelagós Palou, Ariadna; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Mediterranean Conference on Medical and Biological Engineering and Computing
    Presentation's date: 2013-09-27
    Presentation of work at congresses

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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 subjects in a quiet measurement, sampled at 5 kHz and from the I and II standard leads. For each subject a total of 60 minutes was measured. The QRS complexes in both leads have been detected using a conventional QRS detector plus a further refinement using a matching template. Differences between the locations of the QRS complexes have been quantified and compared with the breathing signal of each subject as well as the derived RR time series. The typical uncertainty in the fiducial points and RR time series is usually below 1 ms and the errors are modulated by breathing.

  • Synchrosqueezing index for detecting drowsiness based on the respiratory effort signal

     Rodríguez Ibáñez, Noelia; Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; De Rosario, H.; Ramos Castro, Juan Jose
    Mediterranean Conference on Medical and Biological Engineering and Computing
    Presentation's date: 2013-09-27
    Presentation of work at congresses

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    Objective: The aim of this work is to evaluate a new index to assess the alertness state of drivers based on the respiratory dynamics derived from an inductive band using the variability of the respiratory rhythms assessed by Synchrosqueezing (SSQ). Background: Biomedical variables like abdominal effort, which is related to autonomic nervous system, provides direct information of the driver physiological state, instead of indirect indicia of the participant's behavior. Method: The respiration data used in this study was recorded by doing 18 simulator tests in a controlled scenario. In order to evaluate the viability of variability of the respiratory rhythms assessed by Synchrosqueezing (SSQ) Mean and the Standard Deviation of the Instantaneous Respiration Frequency (MIRF and SDIRF) obtained in the analysis for awake states and drowsy states individually was calculated. Results: The results demonstrate the viability of drowsiness detection in simulator using abdominal effort signal analyzed by Synchrosqueezing based on the significant results of the statistical analysis comparing the Mean (MIRF) and de Standard Deviation (SDIRF) of both awake and drowsy intervals instantaneous respiration frequency (MIRF 0.28 Hz ± SDIRF 0.06 Hz (awake) vs. MIRF 0.21 Hz ± SDIRF 0.06 Hz (drowsy), N=18, p<0.001, t=4.88.

    Objective: The aim of this work is to evaluate a new index to assess the alertness state of drivers based on the respiratory dynamics derived from an inductive band using the variability of the respiratory rhythms assessed by Synchrosqueezing (SSQ). Background: Biomedical variables like abdominal effort, which is related to autonomic nervous system, provides direct information of the driver physiological state, instead of indirect indicia of the participant’s behavior. Method: The respiration data used in this study was recorded by doing 18 simulator tests in a controlled scenario. In order to evaluate the viability of variability of the respiratory rhythms assessed by Synchrosqueezing (SSQ) Mean and the Standard Deviation of the Instantaneous Respiration Frequency (MIRF and SDIRF) obtained in the analysis for awake states and drowsy states individually was calculated. Results: The results demonstrate the viability of drowsiness detection in simulator using abdominal effort signal analyzed by Synchrosqueezing based on the significant results of the statistical analysis comparing the Mean (MIRF) and de Standard Deviation (SDIRF) of both awake and drowsy intervals instantaneous respiration frequency (MIRF 0.28 Hz ± SDIRF 0.06 Hz (awake) vs. MIRF 0.21 Hz ± SDIRF 0.06 Hz (drowsy), N=18, p<0.001, t=4.88.

  • Drowsiness detection by electrooculogram signal analysis in driving simulator conditions for gold standard signal generation

     Rodríguez-Ibáñez, N.; Meca-Calderón, Pablo; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    International Conference on Biomedical Electronics and Devices
    Presentation's date: 2013-02
    Presentation of work at congresses

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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 EOG dynamics derived from a polysomnography device. More than 15 hours of laboratory tests were analyzed in order to detect drowsiness while doing cognitive activities. The proposed method has a sensitivity of 92, 41% and a VPP of 93,41% in detecting drowsiness. The results show that the proposed index may be promising to assess the alertness state of real drivers

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    Using smartphone bases biodevices for analyzing physiological, psychological and behavioral user¿s habits  Open access

     Guede Fernandez, Federico; Pous Sola, Marc; Garcia Gonzalez, Miquel Angel; Capdevila Ortis, Lluís; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    International Conference on Biomedical Electronics and Devices
    Presentation's date: 2013-02
    Presentation of work at congresses

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    As a consequence of increasing life expectancy, the promotion of lifestyles that allow aging wellbeing guarantees has acquired great importance in the developed countries. However, the adherence to healthy behaviors in young and adult people remains as a big problem in the community health field. The development of markers of adherence to healthy lifestyles and the evaluation its effectiveness is a goal of many research groups. This paper presents a system for analyzing physiological, psychological and behavioural user’s habits using a smartphone and externals biodevices. We use an Android smartphone with an internal tri-axial accelerometer and GPS to monitor physical activity. The smartphone is connected via Bluetooth to a respiratory sensor for breath monitoring. In addition, Android application contains psychological questionnaires to analyze user’s mood state and at the same, social interaction is analyzed tracking phone usage and user’s social network. Finally, the collected information is sent to a remote server for a long-term processing.

  • A comparison of heartbeat detectors for the seismocardiogram

     Garcia Gonzalez, Miquel Angel; Argelagós Palou, Ariadna; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Computing in Cardiology
    Presentation's date: 2013-09-24
    Presentation of work at congresses

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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 volunteers was recorded at a sampling frequency of 5 kHz using a Biopac acquisition system. The seismocardiogram was acquired using a triaxial accelerometer (LIS344ALH, ST Microelectronics). Four detectors of the heartbeat from the seismocardiogram were employed relying either on the Continuous Wavelet Transform or bandpass filtering. The detectors adapt their parameters to the morphology of the signal by estimating mean heart rate and the bandwidth of the signal associated to the heartbeat. For all detectors, the standard deviation of the error in the obtained RR time series is in mean slightly higher than 2 ms and the percentage of obtained RR time intervals that have an error higher than 30 ms is around 3.5%. The seismocardiogram, when measured in a quiet environment, can be used instead of the ECG to obtain reliable RR time series when using proper heartbeat detectors.

  • UPCSAT-1, demostrador CubeSat para observación terrestre

     Jove Casulleras, Roger; Camps Carmona, Adriano Jose; Vall-llossera Ferran, Mercedes Magdalena; Bou Balust, Elisenda; Ramos Castro, Juan Jose; Alarcon Cot, Eduardo Jose; Alonso Arroyo, Alberto
    Congreso de la Asociación Española de Teledetección
    Presentation's date: 2013-10
    Presentation of work at congresses

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    UPCSat-1, es el primer proyecto de la Universitat Politécnica de Catalunya para construir y lanzar un pico- satélite. El objetivo principal de este proyecto es construir, ensamblar, testear y poner en órbita baja terrestre (LEO) un sensor óptico y un sensor de oxígeno monoatómico entre otros demostradores tecnológicos. Empezado en 2007 y actualmente en fase de integración, el satélite UPCSat-1 pretende demostrar la validez de la plataforma y las tecnologías que incorpora. Su objetivo es adquirir el know-how para la fabricación de CubeSats para preparar misiones más complejas en un futuro cercano. Por otro lado el proyecto tiene un fuerte componente educacional puesto que algunos de los subsistemas han sido desarrollados por nuestros estudiantes a través de sus proyectos finales de carrera. Se espera el lanzamiento para antes de 2015.

  • An application of fractional differintegration to heart rate variability time series

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose; Capdevila, Lluis; Parrado, Eva
    Computer methods and programs in biomedicine
    Date of publication: 2013-07
    Journal 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. Both indexes are applied to fractional Gaussian noise (fGn) and actual RR time series in order to test their behavior. In the analysis of monofractal time series, ac is linearly related with the Hurst exponent and the estimation of the exponent by the proposed index has lower variance than by using Detrended Fluctuation Analysis (DFA) or the periodogram. The other index fnQ quantifies how the time series adjust to a monofractal time series. Age, postural changes and paced breathing cause significant changes on fnQ while ac only shows significant changes due to posture. In the analyzed actual HRV time series, ac shows good correlation with the short term scaling exponent obtained by DFA, LF/HF and RMSSD while no correlations have been found for fnQ.

  • 2o Concurso de planes de negocio de comercialización de una patente/tecnologia

     Mañanas Villanueva, Miguel Angel; Ramos Castro, Juan Jose
    Award or recognition

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  • A wireless under-mattress sensor system for sleep monitoring in people with major depression

     Mahdavi, Hadiseh; Ramos Castro, Juan Jose; Giovinazzo, Giuseppe; Garcia Gonzalez, Miquel Angel; Rosell Ferrer, Francisco Javier
    IASTED International Conference Biomedical Engineering
    Presentation's date: 2012-02-16
    Presentation of work at congresses

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    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 data and send them through a wireless link to a PC. The resulting data will be subject to further analysis using pattern recognition to evaluate the feasibility of using the system as an indicator of sleep quality. The system is able to detect presence on the bed and movements and breathing of the patient. The changes in pressure distribution on the mattress cause changes in pressure in the layers of the sensor and a voltage will appear on the electrodes. The detection ability depends strongly on the shape of the mattress and the bedbase.

  • Improvement of the actimetry agreement among sites by proper choice of signal processing stages

     Garcia Gonzalez, Miquel Angel; Giovinazzo, Giuseppe; Gomez Bule, Rafael; Landi, Francesca; Ramos Castro, Juan Jose; Rosell Ferrer, Francisco Javier
    IASTED International Conference Biomedical Engineering
    Presentation's date: 2012-02-15
    Presentation of work at congresses

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    Physical activity (PA) has been identified as a key health indicator and has been assessed in multiple studies as the study of cardiovascular diseases, diabetes mellitus, obesity and psychological conditions. For this reason the use of accelerometers to quantify PA is widely accepted in either clinical/laboratory settings as well as in freeliving environments. The use of accelerometers in the measurement of PA is a relatively new technique and, therefore, has been not standardized. The aim of this work is to study the influence of signal processing stages in the estimation of PA while measuring simultaneously in three different sites to provide robust indicators of activity in front of changes in site measurement. With our measurement we show that a proper choice of signal processing steps can improve the agreement among activity indices measured from different sites on the same individual. The results also show that the most suited index is the time above threshold. In this case, the best combination of axes is by applying the quadratic mean, the best filtering of axes is using a cut-off frequency of around 1.5 Hz and a threshold to compute the index of 0.04 g.

  • A wireless sensor network design for the Help4Mood european project

     Pérez Diaz de Cerio, David; Ruiz Boque, Silvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan Jose; Castro Robles, Joan Carles
    European Wireless Conference
    Presentation's date: 2012-04
    Presentation of work at congresses

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    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 Monitoring System (PMS), a set of different wireless sensors whose data sink is centralized on a laptop. The objective of this PMS is to monitor the activity of the patients, so several sensors have been chosen to cover the needs of different individuals. These include a wrist watch, a key ring, a waist/belt sensor, an under mattress sensor and a cellular phone. This paper describes the first prototype and the results obtained from this Wireless Sensor Network.

  • Changes in heart rate variability indexes due to drowsiness in professional drivers measured in a real environment

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose; Rodríguez Ibáñez, Noelia; de la Cruz, M.A.F.
    Computing in Cardiology
    Presentation's date: 2012-09-12
    Presentation of work at congresses

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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 while driving on routes familiar to the subjects. RR time series were quantified using a sliding window of 300 beats. Mean (mRR), standard devi ation (SDNN), standard deviation of the differentiated time series (rmsDD), power of the low (PLF) and high (PHF) frequency bands as well as the ratio LF/HF were computed. In addition, the median frequency of the power spectrum (MEDF), the bandwidth that c ontains the 50% of the power (BW50) and a measure of the asymmetry of the spectrum (AFS) were obtained. Moreover, the Hurst exponent estimated by fractional differintegration (HFDI) and the short scaling exponent obtained by detrended fluctuation analysis (α 1 ) were computed. Two observers classified the state of the drivers minute by minute by inspection of video recordings as alert or drowsy driver. Five subjects were alert for the whole recording while the others presented one or more periods of drowsines s in seven recordings between resting stops. There are not significant differences between groups for all indexes but BW50 (p<0.05). Nevertheless paired tests comparing drowsy and alert periods show significant differences (p<0.05) for SDNN, HFDI, mRR, BW 50 , AFS, α 1 , LF/HF and MEDF.

  • Help4Mood: testing and achievements of the first wireless sensor network prototype

     Pérez Diaz de Cerio, David; Ruiz Boque, Silvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan Jose; Colomé Castellví, Josep Maria
    European Cooperative in Science And Technology
    Presentation's date: 2012-02-10
    Presentation of work at congresses

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    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 Monitoring System (PMS), a set of different wireless sensors whose data sink is centralized on a laptop. The objective of this PMS is to monitor the activity of the patients, so several sensors have been chosen to cover the needs of different individuals. These include a wrist watch, a key ring, a waist/belt sensor, an under mattress sensor and a cellular phone. This paper describes the first prototype and the results obtained from this Wireless Sensor Network

  • Unobtrusive activity measurement in patients with depression: the H4M approach

     Ramos Castro, Juan Jose; Mahdavi, Hadiseh; Pérez Diaz de Cerio, David; Garcia Gonzalez, Miquel Angel; Estevez, Soraya; Rosell Ferrer, Francisco Javier
    Information and Communication Technologies applied to Mental Health
    Presentation's date: 2012-10-04
    Presentation of work at congresses

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  • HRV based Health&Sport markers using video from the face

     Capdevila, Lluis; Moreno, Jordi; Movellan, Javier; Parrado Romero, Eva; Ramos Castro, Juan Jose
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2012-08-28
    Presentation of work at congresses

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    Heart Rate Variability (HRV) is an indicator of health status in the general population and of adaptatio n to stress in athletes. In this paper we compare the performance of two systems to measure HRV: (1) A commercial system based on recording the physiological cardiac signal with (2) A computer vision system that uses a standard video images of the face to estimate RR from changes in skin color of the face. We show that the computer vision system performs surprisingly well. It estimates individual RR intervals in a non - invasive manner and with error levels comparable to those achieved by the physiological based system.

  • Cubesat-based demonstrator for optical Earth observation

     Jove Casulleras, Roger; Camps Carmona, Adriano Jose; Ramos Castro, Juan Jose
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2012-07-26
    Presentation of work at congresses

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    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 Orbit a CubeSat that will carry a simple optical payload and some technological demonstrators. On one hand, this is mainly an educational project in which the development of some of the subsystems is carried out by Master Thesis students. On the other hand, the satellite becomes an optimum platform to perform small scientific experiments, and to demonstrate some of the new technologies that it incorporates.

  • A novel index based on fractional calculus to assess the dynamics of heart rate variability: changes due to chi or yoga meditations

     Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    Computing in Cardiology
    Presentation's date: 2012-09-12
    Presentation of work at congresses

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    The study aims to present and interpret a novel index based on fractional calculus (c) and to assess differences in RR time series dynamics in subjects during meditation. Fractional differintegration (FDI) of a RR time series provides a new time series. c is defined as the order of the FDI operator that provides the time series with minimum variance. Analyzed time series were obtained from the Exaggerated Heart Rate Oscillations During Two Meditation Techniques database. This database contains RR time series before and after Chi Meditation and Kundalini Yoga. It also contains recordings of elite athletes and healthy subjects while sleeping and during metronomic breathing at 0.25 Hz. c is significantly higher during Chi or Yoga meditation when compared with the recordings before the meditation starts or in subjects while sleeping or during metronomic breathing. 2012 CCAL.

    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 series provides a new time series.αc is defined as the order of the FDI operator that provides the time series with minimum variance. Analyzed time series were obtained from the Exaggerated Heart Rate Oscillations During Two Meditation Techniques database. This database contains RR time series before and after Chi Meditation and Kundalini Yoga. It also contains recordings of elite athletes and healthy subjects while sleeping and during metronomic breathing at 0.25 Hz. αc is significantly higher during Chi or Yoga meditation when compared with the recordings before the meditation starts or in subjects while sleeping or during metronomic breathing.

  • Heart rate variability analysis using a seismocardiogram signal

     Ramos Castro, Juan Jose; Moreno, J.; Miranda-Vidal, H.; Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Rodas, G.; Capdevila, L.
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2012-08-31
    Presentation of work at congresses

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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 estimate the heart rate. We compare the heart rate variability parameters from the seismocardi ogram and ECG reference signal. The results show a great similarity and are strongly influenced by the instability in the sampling frequency of the device. The differences between RR series are lower than 10 ms.

  • Temperature coefficient improvement for low noise magnetic measurements in LISA

     Mateos, I.; Diaz Aguiló, Marc; Gibert, Fabien; Lloro, I.; Lobo, Alberto; Nofrarias, M.; Ramos Castro, Juan Jose
    Journal of physics: conference series
    Date of publication: 2012
    Journal article

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  • Development of a system to test somnolence detectors with drowsy drivers

     Lopez De la O, Jaime; Rodríguez Ibáñez, Noelia; Nombela, Mario; Barrios, Jose Manuel; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    Procedia - Social and behavioral sciences
    Date of publication: 2012
    Journal article

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    Somnolence; Semi-autonomous conduction

  • Sistema combinado de análisis de parámetros fisiológicos, cognitivos y conductuales basado en plataformas móviles

     Fernandez Chimeno, Mireya; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose
    Participation in a competitive project

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  • LISA PathFinder radiation monitor proton irradiation test results

     Mateos, I.; Diaz Aguiló, Marc; Gibert, Fabien; Grimani, C.; Hollington, D.; Lloro, I.; Lobo, Alberto; Nofrarias, M.; Ramos Castro, Juan Jose
    Journal of physics: conference series
    Date of publication: 2012
    Journal article

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  • The LISA Pathfinder mission

     Diaz Aguiló, Marc; Ramos Castro, Juan Jose; [et, al]
    Classical and quantum gravity
    Date of publication: 2012-06-21
    Journal article

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  • Método y sistema para inferir el comportamiento o estado del conductor de un vehículo, uso del método y programa informático para llevar a cabo el método

     Fernandez Chimeno, Mireya; Bandez Martinez, Daniel; Bartra Cisa, Ariadna; Marco Colas, Santiago; Ramos Castro, Juan Jose
    Date of request: 2012-02-01
    Invention patent

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  • Método con bio-retroalimentacion para entrenamiento de la musculatura del suelo pelvico

     Mañanas Villanueva, Miguel Angel; Ramos Castro, Juan Jose; Espuña Pons, Montserrat; Perez Gonzalez, Amelia
    Date of request: 2012-07-16
    Invention patent

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    Método con bio-retroalimentación para entrenamiento de la musculatura del suelo pélvico.

    Aplicable al tratamiento de incontinencia urinaria, incontinencia fecal y prolapso de órganos pélvicos, utilizando un dispositivo electrónico portátil para captura mediante sensores de señales EMG de actividad abdominal y de la zona a tratar durante unos ejercicios musculares presentando visual y/o acústicamente unos resultados comprendiendo el método: la colocación de un sensor vaginal o rectal (10) y de dos sensores (11) en la zona baja abdominal, la ejecución de ejercicios trabajando la musculatura del suelo pélvico, la indicación de evaluaciones sobre los ejercicios realizados y el almacenamiento de resultados. La colocación de los sensores la realiza la propia usuaria, evaluando el dispositivo la correcta colocación de sensores con indicación mediante dichos medios acústicos y/o visuales, a la usuaria de que se ha alcanzado un posicionado adecuado, y realizando una etapa previa a los ejercicios de adquisición del tono muscular.

  • Drowsiness detection by thoracic effort signal analysis in real driving environments

     Rodríguez Ibáñez, Noelia; Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2011-09-02
    Presentation of work at congresses

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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 dynamics derived from an inductive band. More than 100 hours of driving in real environments from 13 healthy subjects were analyzed. The proposed method has a sensitivity of 93.7% and specificity of 86.3% in detecting full awake drivers while it has a sensitivity of 83.1% and specificity of 95.3% in detecting drowsy drivers. The results show that the proposed index may be promising to assess the alertness state of real drivers.

  • The Effect of Electrocardiographic Lead Choice on RR Time Series

     Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2011-08-31
    Presentation of work at congresses

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    Results of heart rate variability analysis depend on the quality of the initial RR time series that is measured only in one lead of the ECG. This work shows that RR time series can subtly change from lead to lead so the choice of the analyzed lead is another source of uncertainty. The standard deviation of the differences of two RR time series obtained from different leads can change from 0.5 ms to more than 20 ms depending on the amount of noise, the morphological changes of the QRS complexes, the strategies of fiducial point determination and the measured subject. This source of uncertainty is in healthy subjects greater than that associated to the sampling frequency of the ECG for sampling frequencies greater than 400 Hz.

  • The chain value process and knowledge transfer in a bioengineering case

     González Piñeiro, Manel; Mañanas Villanueva, Miguel Angel; Ramos Castro, Juan Jose; Caminal Magrans, Pedro
    European Conference on Knowledge Management
    Presentation's date: 2011-09-01
    Presentation of work at congresses

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    Drowsiness detection by thoracic effort signal snalysis with professional drivers in real environments  Open access

     Rodríguez Ibáñez, Noelia; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    International Conference on Driver Distraction and Inattention
    Presentation's date: 2011-09-06
    Presentation of work at congresses

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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 is a leadin g objective in advanced driver assistance systems. A biomedical variable like thor acic effort, which is related to autonomic nervous system, provides direct information of the driver physiological state, instead of indirect indicia of the participant's behavior. The refore, they may be especially useful to collect detailed information of the drowsiness state and an ticipate risky situations while driving. Method : The experiment described in this paper allows us to study how drivers react in strenuous conditions, in which they tend to get fat igued and drowsy, but struggle against falling asleep. The respiration data used in this s tudy was recordered by doing 72 hours of simulation driving test and 100 hours of real vehic le tests in real environment. Results : The results demonstrate the viability of drowsine ss detection in real vehicle using thoracic effort signal. The proposed method has a s ensitivity of 93.7% and specificity of 86.3% in detecting full awake drivers while it has a sens itivity of 83.1% and specificity of 95.3% in detecting drowsy drivers. Conclusions : The proposed index may be promising to assess the alertness state of real drivers. Applications : The potential applications of the algorithm are t o detect drowsiness states while driving and give an alarm in commercial fleets or p rofessional drivers to assure the integrity of the driver.

    Postprint (author’s final draft)

  • The LISA Pathfinder interferometry¿hardware and system testing

     Ramos Castro, Juan Jose
    Classical and quantum gravity
    Date of publication: 2011
    Journal article

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    The LISA pathfinder DMU and radiation monitor  Open access

     Canizares, P.; Chmeissani, M.; Conchillo, A.; Diaz Aguiló, Marc; Garcia-berro Montilla, Enrique; Gesa, L.; Gibert, Fabien; Grimani, C.; Lloro, I.; Mateos, I.; Nofrarias, M.; Ramos Castro, Juan Jose; Sanjuan, J.; Fernandez Sopuerta, Carlos; Araujo, H.; Wass, P.
    Classical and quantum gravity
    Date of publication: 2011-05-07
    Journal article

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    The LISA PathfinderDMU(Data Management Unit) flight model was formally accepted by ESA andASDon 11 February 2010, after all hardware and software tests had been successfully completed. The diagnostics items are scheduled to be delivered by the end of 2010. In this paper, we review the requirements and performance of this instrumentation, specially focusing on the Radiation Monitor and the DMU, as well as the status of their programmed use during mission operations, on which work is ongoing at the time of writing.

  • Contribution to long term telemetry in small laboratory animals

     Zabaco Natali, Oscar
    Defense's date: 2011-09-07
    Department of Automatic Control, Universitat Politècnica de Catalunya
    Theses

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  • Healthy Life style and Drowsiness Prevention-HEALING DROP

     Ramos Castro, Juan Jose; Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya
    Participation in a competitive project

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  • A COMPUTATIONAL DISTRIBUTED SYSTEM TO SUPPORT THE TREATMENT OF PATIENTS WITH MAJOR DEPRESSION

     Caminal Magrans, Pedro; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan Jose; Garcia Gonzalez, Miquel Angel; Mahdavi, Hadiseh
    Participation in a competitive project

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  • New indices for quantification of the power spectrum of heart rate variability time series without the need of any frequency band definition

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ferrer, J; Escorihuela, R.M.; Parrado Romero, Eva; Capdevila, L; Benitez, A; Angulo, R; Rodriguez, F. A.; Iglesias, X; Bescós, R.; Marina, M; Padullés, M.; Ramos Castro, Juan Jose
    Physiological measurement
    Date of publication: 2011-06-07
    Journal article

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    This paper presents a new family of indices for the frequency domain analysis of heart rate variability time series that do not need any frequency band definition. After proper detrending of the time series, a cumulated power spectrum is obtained and frequencies that contain a certain percentage of the power below them are identified, so median frequency, bandwidth and a measure of the power spectrum asymmetry are proposed to complement or improve the classical spectral indices as the ratio of the powers of LF and HF bands (LF/HF). In normal conditions the median frequency provides similar information as the classical indices, while the bandwidth and asymmetry can be complementary measures of the physiological state of the tested subject. The proposed indices seem to be a good choice for tracking changes in the power spectrum in exercise stress, and they can guide in the determination of frequency band limits in other animal species.

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    Changes in heart rate variability (HRV) in field hockey players during the 2006 World Cup  Open access

     Rodas Font, Gil; Yanguas Leyes, Javier; Pedret, Carles; Ramos Castro, Juan Jose; Capdevila, L
    Apunts Medicina de l'Esport
    Date of publication: 2011-07
    Journal article

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    The aim of this study is to determine the changes in heart rate variability (HRV) in field hockey players during the course of a world championship. The Spanish national team took part in the study by making daily records of the R-R interval (Omegawave System) on the days when matches took place. The baseline heart rate (HR) and several parameters of HRV were measured. The evolution of the average values of the HR and the various parameters of HRV during the 7 matches was compared using a MANOVA, the contrasts regarding the last match being analysed. The HR increases progressively during the seven matches, with an especially significant increase in the last match (F(18.6) = 3.27; p=.024). RMSSD and pNN50 parameters progressively decrease throughout the tournament, with an especially significant decrease for pNN50 (F(18.6) = 2.96; p=.034). Regarding the parameters of the frequency spectrum, LF and LF/HF show an increase throughout the 7 matches (for LF, F(18.6) = 2.72; p=.046), and HF presented lower values. HRV decreases progressively and the values of the parameters related to parasympathetic system activity (RMSSD and HF) reduce, which are indicative of good psychic-physical adaptability to the workload. At the same time, the value of the parameters related to sympathetic system activity (LF and LF/HF) increases, suggesting an increase in fatigue, tiredness and poor adaptability in general. Consequently, the analysis of HRV may be a good marker for monitoring the psychic-physical state, cardiovascular adaptability during exercise and a possible state of physical overload in athletes participating in competitions.

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    A new and fast index for the quantification of short range self-similarity in RR time series  Open access

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Computing in Cardiology
    Presentation's date: 2010-09-27
    Presentation of work at congresses

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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. fscmd computes the relative number of sign changes of the difference of the RR time series minus their corresponding reversed RR time series after a moving average detrending procedure is applied using a window of 30 samples. Linear regression results with simulated time series with Fractional Brownian Noise and with actual time series using the Fantasia (FT), Normal Sinus Rhythm RR time series (NSR) and Congestive Heart Failure RR interval (CHF) databases after artifact correction show good agreement between fscmd and  R. Finally, Mann-Whitney Rank Sum tests applied to  R and fscmd when comparing NSR and CHF databases show very significant differences (p<0.001) between groups for both indices.

  • Un método rápido para la cuantificación de la autosemejanza de corto alcance en series RR

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation's date: 2010-11-26
    Presentation of work at congresses

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  • Comparison of omega wave system and polar S810i to detect R-R intervals at rest

     Parrado Romero, Eva; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Cervantes Blasquez, Julio Cesar; Rodas, Gil; Capdevila Orti, Lluís
    International journal of sports medicine
    Date of publication: 2010
    Journal article

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  • Sistema modular para la alimentación por campo magnético en telemetría animal

     Zabaco Natalí, Oscar; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Date of request: 2010-06-11
    Invention patent

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    La presente invención se refiere a un sistema modular (1) para proporcionar energía a un dispositivo electrónico (2) a través de un campo magnético.

    El dispositivo electrónico (2) es un implante para animales de laboratorio cuya misión es medir y enviar información de funciones fisiológicas del animal para un posterior análisis y estudio. El implante posee un módulo de almacenamiento de energía temporal.

    El subsistema que proporciona energía a través del campo magnético para la alimentación del implante está alojado en la jaula del animal y su modularidad permite aplicarlo a alojamientos animales tan grandes como se desee.

    El sistema modular permite estudios de duración prolongada, (en los cuales el uso de baterías está descartado), mientras el animal se mueve libremente en su jaula sin ningún tipo de restricción. El sistema modular permite además extraer el animal de la zona de generación de campo magnético durante periodos de tiempo limitados sin que se pierdan las funciones del implante por falta de alimentación.

  • Analog-to-digital converters nonlinear errors correction in thermal diagnostics for the laser interferometer space antenna mission

     Sanjuan, J; Lobo, A; Ramos Castro, Juan Jose
    Review of scientific instruments
    Date of publication: 2009
    Journal article

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  • Relaciona de intervalos: índices electrocardiográficos no invasivos para valorar la repolarización ventricular

     Ramos Castro, Juan Jose; Pallas Areny, Ramon; Alvarado, Carlos Serrano
    Date of publication: 2009-04-30
    Book chapter

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  • Development and validation of the thermal diagnostics in LISA Pathfinder  Open access

     Sanjuán Muñoz, Josep
    Defense's date: 2009-09-28
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    This thesis focuses on the issues related to the thermal diagnostics aboard the space mission LISA Pathfinder (LPF). LPF is a technological mission devoted to put to test critical subsystems for the LISA mission. LISA will be the first space born gravitational wave (GW) observatory with the main objective of detecting GWs. GWs are ripples of the space-time geometry caused by acceleration of masses in an asymmetric way. Their detection requires put test masses (TMs) in an almost perfect inertial frame (or free fall).Non-inertial forces perturbing the TMs must be less than 6 fN/sqrt(Hz) in the frequency range of 0.1 mHz to 0.1 Hz and the noise in the measurement between the TMs (separated by 5 Gm) must be of 40 pm/sqrt(Hz) in the same band. To reduce the risks of a direct launch of LISA, ESA has decided to first launch LPF to put all the LISA technologies to test.The payload of LPF, the LISA Technology Package (LTP), contains two TMs placed in two cylinders inside a single spacecraft (SC) and an interferometric system that measures the relative distance between them. The SC isolates the TMs from the external disturbances but internal stray forces will still perturb the TMs. Their levels must be bounded not to challenge the free fall accuracy. One of these disturbances is temperature fluctuations and the aspects related to their measurement are the leitmotif of this thesis.In chapter 1 we have presented how temperature fluctuations couple into the key subsystems of the LTP to degrade their performance. The foreseen effects are radiation pressure, radiometer effect, temperature coefficient of optical components, etc. Onground estimations conclude that the temperature stability in the LTP must be less than 100 microK/sqrt(Hz) in the frequency range of 1 mHz to 30 mHz (LTP band). Since temperature fluctuations are an important issue in LPF and in LISA, a thermal diagnostic subsystem is needed aboard both missions.The task of the thermal diagnostics in the LTP is twofold: on the one hand, temperature fluctuations in different subsystems must be measured with noise levels of 10 microK/sqrt(Hz) in the LTP band. On the other hand, a set of heaters will generate heat pulses that in conjunction with temperature measurements will be used to estimate the actual coupling between temperature and systems performance. These actions will provide information on the behaviour of the system and will permit to identify the fraction of noise in the system coming from temperature issues. The main function of LPF, as precursor mission of LISA, is the understanding of all the noise sources in the system. This will provide clues to the final leap from LPF sensitivity to LISA one.The main investigations carried out during this thesis can be split into three main categories: (i) the design and validation of the LTP temperature measurement subsystem (TMS); (ii) the extension of the system to the LISA requirements; and (iii) the analysis of the in-flight thermal experiments in the LTP. The thesis is organised as follows: in chapter 2 we describe the designed electronics and the temperature sensors chosen. Aspects related to the coupling of the TMS with other subsystems nearby are discussed in chapter 3. Chapter 4 focuses on the design of the testbed needed for the validation of the TMS. Two different testbeds are described: one for the LTP measurement bandwidth (MBW) and another one for the LISA MBW, 0.1 mHz. In chapter 5 we present the results of the test campaigns: the prototype, the engineering model and the flight model systems were put to test. The results of the investigations in the LISA band are also shown. Chapter 6 contains investigations in view of LISA requirements to reduce excess noise at very low frequency and to reduce the floor noise of the measurement. Chapter 7 focuses on the thermal experiment on-board LPF: a set of thermal excitations are proposed to extract information of the thermal behaviour of the key subsystems of the LTP.

  • SISTEMA DE ANALISIS DE PARAMETROS FISIOLOGICOS INDICADORES DE SALUD, APLICACION A RESULTADOS EN HUMANOS Y ANIMALES

     Fernandez Chimeno, Mireya; Garcia Gonzalez, Miquel Angel; Vargas Drechsler, Manuel Agustin; Ramos Castro, Juan Jose
    Participation in a competitive project

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  • An Empirical Methodology for the Definition of Frequency Bands for Spectral Analysis of Heart Rate Variability in Animals: Application to Sprague-Dawley Rats

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Escorihuela, R.M.; Capdevila, L.; Ramos Castro, Juan Jose
    World Congress on Medical Physics and Biomedical Engineering
    Presentation of work at congresses

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    Obtención empírica del límite frecuencial entre las bandas de baja y altra frecuencia en análisis de variabilidad del ritmo cardíaco: aplicación en ratas y humanos  Open access

     Garcia Gonzalez, Miquel Angel; Fernandez Chimeno, Mireya; Escorihuela, R.M.; Capdevila, Lluis; Ramos Castro, Juan Jose
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation's date: 2009-11
    Presentation of work at congresses

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    Se propone un nuevo método para la determinación empírica de los límites entre las bandas de baja frecuencia y alta frecuencia del espectro de potencia de las series RR en los estudios de variabilidad del ritmo cardíaco. El método se ha aplicado a series RR obtenidas en humanos y ratas Sprague-Dawley. Para humanos el límite coincide con la recomendación de 0,15 Hz mientras que para ratas Sprague-Dawley la metodología empleada sugiere un límite de 0,75 Hz.

  • Data analysis for the LISA Technology Package

     Hewitson, M; Armano, M; Benedetti, M; Bogenstahl, J; Bortoluzzi, D; Bosetti, P; Brandt, N; Cavalleri, A; Ciani, G; Cristofolini, I; Cruise, M; Danzmann, K; Diepholz, I; Dolesi, R; Ramos Castro, Juan Jose
    Classical and quantum gravity
    Date of publication: 2009-05
    Journal article

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