GCEM - Electromagnetic Compatibility Group
Total activity: 658
Type
Research group
Type of group
TECNIO Network / CIT UPC
Acronym
GCEM
Address
Jordi Girona, 1-3. Edifici C4 Campus Nord Open in new window
City
Barcelona
URL
http://www.upc.edu/web/gcem Open in new window
Keywords
GCEM - Grup de Compatibilitat Electromagnètica

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1 to 50 of 658 results
  • Tidal volume monitoring by electrical impedance tomography (EIT) using different regions of interest (ROI): calibration equations

     Balleza Ordaz, José Marco; Vargas Luna, Miguel; Pérez Alday, Erick Andrés; Riu Costa, Pere Joan
    Biomedical signal processing and control
    Vol. 18, p. 102-109
    DOI: 10.1016/j.bspc.2014.12.004
    Date of publication: 2015-04-01
    Journal article

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    set of calibration equations was previously obtained to transform the lung impedance changes obtained by electrical impedance tomography (EIT), using all frame's elements, into a measurable volume signal. In order to study the goodness of the use of regions of interest (ROI) for lung ventilation monitoring, we considered 6 different ROI to obtain a calibration equation for each area. Our aim was to compare the results, determined by these areas, and those obtained by using all EIT image elements. Two ROI's were defined by those pixels with an impedance change higher than 30% and 70% of the maximum change value. These areas were called P30 and P70, respectively. Two other ROI were defined by bounding two areas by mouse, resembling P30 and P70 regions, which were called M30 and M70, respectively. The remainder was defined by two elliptical areas with an eccentricity of 0.8, and 25 and 32 pixels of mayor axis (E25p and E32p, respectively). Twenty healthy males and 24 chronic obstructive pulmonary disease (COPD) patients were considered. For small region (P30 and M30) we obtained a large dispersion in volume measurement, concluding that small regions are not suitable for monitoring the tidal changes in lung volume even for healthy subjects. The results obtained by the remainder areas, and by using EIT image were similar. Even a slight improvement in data dispersion was obtained by using some ROI. These optimal results, for healthy people, were those corresponding to P70 and M70 (volume dispersion improved from 12% with the whole EIT image to 9% using ROI), and for COPD patients improves volume dispersion from 32% using the whole EIT image to 27% by using E25p. Using not so small ROI, it is possible to estimate the total lung ventilation.

    Postprint (author’s final draft)

  • Full-spectrum APD measurement of transient interferences in time domain

     Pous Sola, Marc; Silva Martinez, Fernando
    IEEE transactions on electromagnetic compatibility
    Vol. 56, num. 6, p. 1352-1360
    DOI: 10.1109/TEMC.2014.2352393
    Date of publication: 2014-12-01
    Journal article

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    Radiated transient interferences produce severe errors to digital communication systems. Conventional measurements defined in the electromagnetic compatibility (EMC) standards are not sufficient to predict the impact of this impulsive noise on the quality of a digital system, as measurements were originally defined to protect analogue communication systems. Measurement detectors and methods based on reaching the statistical of the interference have been studied as the best option to evaluate transient interferences. For a properly EMC emissions evaluation, an amplitude probability detector (APD) has been recommended as the best option, since APD results have been correlated with bit error probability. However, carrying out APD measurements using electromagnetic interference (EMI) receivers has strong inconvenience. One of the main limitations is that measurement can only be performed with the preset filters available at the EMI receiver, which sometimes are different from the communication bandwidths causing an incorrect estimation on the degradation produced. Another restriction is the elapsed time needed to acquire the statistical APD measurement at each frequency band. This document presents a methodology to obtain the APD measurement at any frequency band employing two single time-domain oscilloscope captures. The developed measurement method makes it possible to obtain the APD at any frequency band achieving as good results as the ones acquired from EMI receivers. To show the effectiveness of the time-domain method, an exhaustive validation study is presented, in which white Gaussian noise and several impulsive interferences are evaluated at frequencies from 50 MHz up to 1 GHz.

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    Análisis de la variabilidad de la frecuencia cardíaca mediante fotopletismografía por imagen  Open access

     Melchor Rodríguez, Angel; Ramos Castro, Juan Jose
    Congreso Anual de la Sociedad Española de Bioingeniería
    p. 1-4
    Presentation's date: 2014-11-27
    Presentation of work at congresses

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    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 cardiovasculares. En este trabajo es llevado a cabo la adquisición de la señal del ritmo cardíaco mediante la técnica de fotopletismografía por imagen haciendo uso de una cámara de video comercial para un posterior análisis de la VFC. Se comparan los resultados obtenidos por el método propuesto con la señal de ECG adquirida con un sistema de referencia. Los resultados del análisis estadístico de la VFC muestran una gran similitud entre ambos métodos.

    Postprint (author’s final draft)

  • Gold standard generation using electrooculogram signal for drowsiness detection in simulator conditions

     Rodríguez Ibáñez, Noelia; Meca-Calderón, Pablo; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    DOI: 10.1007/978-3-662-44485-6
    Date of publication: 2014-11-02
    Book chapter

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    As improving road safety is one of the first aims in the automotive world, several new techniques and methods are being researched in recent years. Some of them consist of monitoring the driver behavior to detect non-appropriate states for driving, e.g. drowsy driving or drunk driving. Usually, the appearance of these non-appropriate states is related to changes in several physiological parameters. This work is divided into two main parts. The first one presents an electrical bioimpedance system capable of monitoring the ventilation using textile electrodes. Apart from describing the system, in this part some tests done in a controlled environment are also shown. In the second part of this paper, an enhancement of the system is described and checked using a patient simulator.

  • Monitoring drivers' ventilation using an electrical bioimpedance systems: tests in a controlled enviornment

     Macias Macias, Raul; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Bragos Bardia, Ramon; Fernandez Chimeno, Mireya
    DOI: 10.1007/978-3-662-44485-6
    Date of publication: 2014-11-02
    Book chapter

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    As improving road safety is one of the first aims in the automotive world, several new techniques and methods are being researched in recent years. Some of them consist of monitoring the driver behavior to detect non-appropriate states for driving, e.g. drowsy driving or drunk driving. Usually, the appearance of these non-appropriate states is related to changes in several physiological parameters. This work is divided into two main parts. The first one presents an electrical bioimpedance system capable of monitoring the ventilation using textile electrodes. Apart from describing the system, in this part some tests done in a controlled environment are also shown. In the second part of this paper, an enhancement of the system is described and checked using a patient simulator.

  • Assessment of energy expended in physical activity by a smartphone-based system

     Guede Fernandez, Federico; Carbones Fargas, Bernat; Capdevila Ortis, Lluís; Garcia Gonzalez, Miquel Angel; Ramos Castro, Juan Jose; Fernandez Chimeno, Mireya
    European Conference of the International Federation for Medical and Biological Engineering
    p. 893-896
    DOI: 10.1007/978-3-319-11128-5
    Presentation's date: 2014-09-09
    Presentation of work at congresses

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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 health concern, because sedentary behaviors ar e associated to cardiovascular diseases and premature death. A smartphone application has been developed for data gathering from internal motion sensor, wireless wearable heart rate moni tor and user filled out forms. The data collected have been sent to a remote server to esti- mate the total energy expenditure (TEE), which has been determined by the sum of three components: basal energy expenditure (BEE), physical activi ty (AEE) and thermic effect of food (TEF). In this study, the subjects have used the devel- oped application for seven consecutive days, which represents a typical week. Then, a profil e of their daily TEE has been obtained. The presented system is a useful tool to generate personalized recommendations to maintain energy balance through more active lifestyle and healthier eating habits.

  • Time-domain electromagnetic interference measurement system for intermittent disturbances

     Costa Godo, Gerard; Pous Sola, Marc; Atienza Picola, Andreu; Silva Martinez, Fernando
    International Symposium on Electromagnetic Compatibility
    p. 833-837
    DOI: 10.1109/EMCEurope.2014.6931019
    Presentation's date: 2014-09-03
    Presentation of work at congresses

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    In Electromagnetic Compatibility emission measurements, a common problem takes place when equipment producing intermittent disturbances are measured according to standard procedures. In many cases, it is impossible to capture the maximum emission using conventional receivers with only one or several sweeps. A significant measurement improvement is possible when time-domain captures and post-processing implementing digital fast Fourier transform (DFT) is used to obtain the frequency spectrum. In addition, the time-domain method offers the possibility to capture all the spectrum frequency range of one single event and evaluate rapidly all the different functional modes of a complex EUT. In this paper, the time-domain method is described and validated for conducted emissions test. For the validation proposes, a multisine signal is measured using the developed method and the results are compared with results acquire from an EMI receiver. Finally, after validation, the time-domain method is applied to complex equipment observing the main advantages that the developed method provides.

  • APD radiated transient measurements produced by electric sparks employing time-domain captures

     Pous Sola, Marc; Silva Martinez, Fernando
    International Symposium on Electromagnetic Compatibility
    p. 813-817
    DOI: 10.1109/EMCEurope.2014.6931016
    Presentation's date: 2014-09-02
    Presentation of work at congresses

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    Electric sparks phenomena produce electromagnetic radiated transient noise which is one of the main interference causes that disturb digital communication systems such as DVB-T or GSM-R. Detectors and methodologies defined at the EMC harmonized standards are not sufficient to measure and characterize properly this type of interference noise. Otherwise, amplitude probability distribution (APD) detector is an appropriate measurement to reach the main parameters of impulsive interferences; as in addition to acquire the amplitude of the disturbance, it provides statistical information. Moreover, the APD diagram of an interference has been related to the bit error probability of some digital coherent radio receivers. In this paper, an ESD spark generator according to EN 61000-4-2 has been employed to produce radiated transient interferences to evaluate the impact over the APD results considering several frequency bands. Several APD measurements have been carried out employing an EMI receiver and also an oscilloscope for validation propose. The radiated transient produced by the sparks has been evaluated at GSM-R and TETRA frequency bands. Results shows that GSM-R system can be interfered by ESD electric sparks and emphasize the powerful capabilities of the time-domain procedure.

  • Use of reference limits in the Feature Selective Validation (FSV) method

     Jauregui Telleria, Ricardo Ignacio; Pous Sola, Marc; Silva Martinez, Fernando
    International Symposium on Electromagnetic Compatibility
    p. 1031-1036
    DOI: 10.1109/EMCEurope.2014.6931054
    Presentation's date: 2014-09-02
    Presentation of work at congresses

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    This paper presents a method for taking into account reference limits when the Feature Selective method (FSV) is applied. Nowadays, there is a long line of research that underlines the important role played by the FSV to perform an objective validation process. However, until now, there has been no consideration of a reference level in the validation process. This paper presents a methodology to calculate the FSV values when a reference limit is contemplated. We demonstrate the importance of this technique in the validation criteria for the Computational Electromagnetics and, more particularly, in the EMC comparison process. Finally, in order to show the application and the importance of the method, two real cases, considering different reference levels, are analysed.

  • Application of the feature selective validation method to pattern recognition

     Ventosa Llopart, Josep Oriol; Pous Sola, Marc; Silva Martinez, Fernando; Jauregui Telleria, Ricardo Ignacio
    IEEE transactions on electromagnetic compatibility
    Vol. 56, num. 4, p. 808-816
    DOI: 10.1109/TEMC.2013.2291494
    Date of publication: 2014-08-01
    Journal article

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    Pattern recognition is a mature field; however, in recent years it has developed a special interest. Many methods have been developed exclusively focusing on this subject; all of them, however, are centered on certain types of patterns. In this paper, a new method, which aims to be as flexible as possible, is proposed. This technique is based on a validation standard method used in electromagnetic compatibility named feature selective validation. The final objective of developing the algorithm is to make it adaptable to diverse types of patterns. An application on the recognition of transient patterns is exposed as an example. Nevertheless, a wide range of other types of signals is likely to be treated with the same logic.

  • Analyzing transient phenomena in the time domain using the Feature Selective Validation (FSV) method

     Jauregui Telleria, Ricardo Ignacio; Zhang, Gang; Rojas Mora, Julio; Ventosa Llopart, Josep Oriol; Silva Martinez, Fernando; Duffy, Alistair P.; Sasse, Hugh
    IEEE transactions on electromagnetic compatibility
    Vol. 56, num. 4, p. 825-834
    DOI: 10.1109/TEMC.2013.2246167
    Date of publication: 2014-08-01
    Journal article

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    The increasing application of simulation tools to increasingly complex problems makes the use of validation tools essential to improve confidence in the veracity of those simulation results. IEEE Standard 1597.1 is the first true standard for the validation of computational electromagnetics method. This standard uses the feature selective validation (FSV) method as the key quantification tool. However, despite its many advantages, there have been some interesting issues surrounding the validation of transients. This paper presents a new approach to the validation of a set of generally representative transient types using the FSV method and shows how the previously experienced limitations can be overcome. In order to analyze the main parameters associated with transient comparison, a survey which included 20 experts was conducted. This information was used to identify the significant regions that need to be taken into account in the transient comparison. Finally, using the statistics obtained by the experts, a new solution was defined and its improvement over the existing approach was demonstrated.

  • A review on the drawbacks and enhancement opportunities of the feature selective validation

     Azpúrua Auyanet, Barón Marco Aurelio; Páez, Eduardo Javier; Rojas Mora, Julio; Ventosa Llopart, Josep Oriol; Silva Martinez, Fernando; Zhang, Gang; Duffy, Alistair P.; Jauregui Telleria, Ricardo Ignacio
    IEEE transactions on electromagnetic compatibility
    Vol. 56, num. 4, p. 800-807
    DOI: 10.1109/TEMC.2014.2304622
    Date of publication: 2014-08-01
    Journal article

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    The growing application of simulation tools to increasingly complex problems makes the use of validation techniques essential to improve confidence in the veracity of those simulation results. The feature selective validation (FSV) method is widely used today, because of its versatility and simplicity. However, despite its many advantages, some problems have been identified in the standardized FSV method. Those drawbacks can produce misleading results for the validation process and constitutes enhancement opportunities for further research on FSV improvement. This paper presents a review that summarizes the major problems of the FSV and their possible solutions as a justification to reform the FSV method and also looking towards the forthcoming update of the standards IEEE 1957.1/2.

  • Prediction of the impact of transient disturbances in real-time digital wireless communication systems

     Pous Sola, Marc; Silva Martinez, Fernando
    IEEE Electromagnetic Compatibility Magazine
    Vol. 3, num. 3, p. 76-82
    DOI: 10.1109/MEMC.2014.6924332
    Date of publication: 2014-07-01
    Journal article

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    In this paper the simulation methodology has been useful to establish the effect of a transient interference coupled to a digital communication system. An RFID system according to ISO 14443 type B standard is interfered by transient interference according to EN 61000-4-4 standard producing decision errors. The usage of the software tools employed to analyze the distortion of digital communication systems in convergence of the EM simulation software is a powerful methodology to quantify the degradation of a real digital communication system.

  • Temperature gradient sensor from pulsed power supply duty cycle in ultra-low-power energy harvesting system

     Jove Casulleras, Roger; Ramos Castro, Juan Jose; Corimanya, H; Camps Carmona, Adriano Jose; Alarcon Cot, Eduardo Jose; Amezaga Sarries, Adria; Bou Balust, Elisenda
    Electronics Letters
    Vol. 50, num. 11, p. 826-828
    DOI: 10.1049/el.2014.0399
    Date of publication: 2014-05-22
    Journal article

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    Directly interfacing sensors that link sensors to micro-controllers without a signal conditioning circuit or an analogue-to-digital converter on the one side and energy harvesting systems on the other side are two key enabling technologies to create self-powered autonomous low-cost and low-maintenance sensor networks. In this reported work, both technologies are concurrently combined in such a way that the duty cycle of the pulsed power supply provided by the harvesting system itself yields in turn a temperature gradient sensor functionality. Originally conceived to power a low-power satellite beacon in a CubeSat project, it has found application, among other applications, in automatic air conditioning and heating systems aiming smart buildings.

  • Desenvolupament de marcadors d'estil de vida saludable per a gent grant basats en Smartphones

     Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose; Capdevila Ortis, Lluís; Guede Fernandez, Federico; Parrado Romero, Eva; Moreno Sánchez, Jordi; Garcia Gonzalez, Miquel Angel
    Competitive project

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  • Intrumentació electrònica i biomèdica

     Riu Costa, Pere Joan; Fernandez Chimeno, Mireya; Garcia Gonzalez, Miquel Angel; Nescolarde Selva, Lexa Digna; Ramos Castro, Juan Jose; Silva Martinez, Fernando; Torrents Dolz, Josep Maria; Bragos Bardia, Ramon; Rosell Ferrer, Francisco Javier
    Competitive project

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  • Pla d'actuacions del GCEM

     Silva Martinez, Fernando
    Competitive project

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  • Desarrollo de sondas y validación de resultados numéricos en el dominio del tiempo para efectos indirectos de descargas atmosféricas en UAV

     Fernandez Chimeno, Mireya; Atienza Picola, Andreu; Silva Martinez, Fernando; Nuño Fernández, Luis; Riu Costa, Pere Joan
    Competitive project

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  • Healthy Life style and Drowsiness Prevention-HEALING DROP

     Fernandez Chimeno, Mireya
    Competitive project

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  • Determination of the equivalent circuit for a cylindrical loop-coupled cavity resonator

     Páez, Eduardo Javier; Callarotti Casare, Roberto; Azpúrua Auyanet, Barón Marco Aurelio; Sanchez, Yuande
    Conference on Precision Electromagnetic Measurements
    p. 182-183
    DOI: 10.1109/CPEM.2014.6898319
    Presentation's date: 2014
    Presentation of work at congresses

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    In this paper we present the calculation of the equivalent circuit's parameters for a magnetic loop-coupled cylindrical resonant cavity. This analysis is valid even for moderated quality factors, Q. The equivalent circuit is determined via field analysis using the Lagrangian formulation considering all terms of the mathematical formalism, whose RLC parameters are determined using a Vector Network Analyzer and the critical points method. This approach offers an interesting insight useful to characterize resonant cavities with potential application in electromagnetic material characterization.

  • Measurement uncertainty propagation through the feature selective validation

     Azpúrua Auyanet, Barón Marco Aurelio; Páez, Eduardo Javier; Jauregui Telleria, Ricardo Ignacio
    IEEE International Symposium on Electromagnetic Compatibility
    p. 328-333
    DOI: 10.1109/ISEMC.2014.6898992
    Presentation's date: 2014
    Presentation of work at congresses

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    The Feature Selective Validation (FSV) is the standard method used for validation assessment in Computational Electromagnetics, and it uses both quantitative and qualitative indicators to measure de similarity between a pair of data sets. However, standardized FSV rely on a heuristic procedure for graphical comparison that does not include considerations about the uncertainty of the data sets involved. The reliability of the validation results, and therefore of the model under validation, depends on the uncertainty of the data sets used as input for the FSV, even more considering that some measurements associated to electromagnetic compatibility tests are characterized by a large uncertainty. Nonetheless, the FSV algorithm makes the propagation of such uncertainties a difficult and cumbersome task through the conventional approaches. This paper presents the application of the Monte Carlo Method as an approach to propagate the uncertainty of the input data sets in order to estimate a confidence interval for each FSV indicator. Finally, a numerical example is presented and discussed.

  • Fluxgate magnetometer vector feedback homogeneity and its influence on sensor parameters

     Petrucha, V; Janosek, M; Azpúrua Auyanet, Barón Marco Aurelio
    IEEE International Instrumentation and Measurement Technology Conference
    p. 460-463
    DOI: 10.1109/I2MTC.2014.6860787
    Presentation's date: 2014
    Presentation of work at congresses

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    Precise fluxgate sensors are built with a vector feedback, which eliminates the cross-field effect and improves linearity. The sensor axes orthogonality should be then defined primarily by the orientation of the feedback coils while the sensitivities are defined by feedback coil constants. The influence of the homogeneity of the feedback field on calibration parameters of a vectorially compensated tri-axial fluxgate magnetometer is presented.

  • Statistical performance comparison between the FSV and the FS-NMI index

     Azpúrua Auyanet, Barón Marco Aurelio; Jauregui Telleria, Ricardo Ignacio; Silva Martinez, Fernando; Parra, Xileidys
    IEEE International Symposium on Electromagnetic Compatibility
    p. 322-327
    DOI: 10.1109/ISEMC.2014.6898991
    Presentation's date: 2014
    Presentation of work at congresses

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    This paper presents a performance comparison between two validation methods developed specifically for the Computational Electromagnetics purposes: the Feature Selective Validation (FSV) and the Feature Selective Normalized Mutual Information (FSNMI) index. To achieve this goal, a statistical analysis of 40 different cases of study (pairs of data sets) is carried out covering a wide range of real-life applications, such as, frequency domain, noisy and transient data, among others. The results provided an insight of the relationships between each method, showing that more effort is required to achieve generally coherent validation results between the FSV and the FSNMI.

  • Feature selective validation applied to the comparison of calibration data

     Sanchez, Yuande; Rosi, Carlos; Páez, Eduardo Javier; Azpúrua Auyanet, Barón Marco Aurelio
    Conference on Precision Electromagnetic Measurements
    p. 194-195
    DOI: 10.1109/CPEM.2014.6898325
    Presentation's date: 2014
    Presentation of work at congresses

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    This paper presents an alternative application of the Feature Selective Validation (FSV) for comparing metrological data such as those coming from calibration certificates, standard references and historical records of intermediate verifications. Through the examples developed in this work, it is shown how the FSV method can be used to study the drift of the characteristic response of a measuring device, transducer or accessory, allowing identifying when the deviations observed are unacceptable requiring performing adjustments within the measurement chain. This approach can also be used to measure the improvement on a calibration method or of an specific condition of it.

  • 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
    p. 49-52
    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.

  • 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
    p. 962-964
    DOI: 10.1007/978-3-319-00846-2_238
    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
    p. 965-968
    DOI: 10.1007/978-3-319-00846-2_239
    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.

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    A comparison of heartbeat detectors for the seismocardiogram  Open access

     Garcia Gonzalez, Miquel Angel; Argelagós Palou, Ariadna; Fernandez Chimeno, Mireya; Ramos Castro, Juan Jose
    Computing in Cardiology
    p. 461-464
    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.

  • Co-simulation methodology to evaluate digital communication systems interfered by transients

     Pous Sola, Marc; Silva Martinez, Fernando
    International Symposium on Electromagnetic Compatibility
    p. 665-670
    Presentation's date: 2013-09-04
    Presentation of work at congresses

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    In this paper a method combining different types of simulation is used to evaluate transient interferences over a digital communication system at its frequency band. The method combines different simulation stages; the first one is an electromagnetic simulation, with FDTD numerical method, which is carried out to establish the level of the interference coupled to the digital communication system; at the second stage, the simulation of the transmitted data at the communication system is performed introducing the EM interference calculated at the first stage. The result of this co-simulation will be a BER and other useful indicators to quantify the degradation produced by the transient interference. To show the effectiveness of the co-simulation method first of all the method is validated comparing the results with other evaluation techniques, measuring a real interference over an RFID system. The RFID system is according to the ISO 14443 type B standard, and the interference generated is a burst according to 61000-4-4. Once the co-simulation method is validated, the co-simulation system is used to quantify and decide if an EMC redesign technique of the previous scenario is efficient enough to avoid degradation at the RFID system produced by the burst transient interference.

  • IND60 EMC - Improved EMC test methods in industrial environments

     Silva Martinez, Fernando; Pous Sola, Marc; Azpúrua Auyanet, Barón Marco Aurelio; Atienza Picola, Andreu; Aragon Homar, Marc
    Competitive project

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  • 8th Google Faculty Reserach Award

     Alarcon Cot, Eduardo Jose; Camps Carmona, Adriano Jose; Ramos Castro, Juan Jose
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  • 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
    Vol. 20, num. 4, p. 50-56
    DOI: 10.1109/MWC.2013.6590050
    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.

  • Feature selective normalized mutual information index for the validation of computational electromagnetics

     Azpúrua Auyanet, Barón Marco Aurelio; Páez, Eduardo Javier; Jauregui Telleria, Ricardo Ignacio
    IEEE International Symposium on Electromagnetic Compatibility
    p. 43-48
    DOI: 10.1109/ISEMC.2013.6670379
    Presentation's date: 2013-08
    Presentation of work at congresses

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    An important concern in the validation of computational electromagnetics (CEM) is to incorporate quantitative indicators in order to perform conclusive comparisons between model predictions with respect to a reference expected response, such as data obtained from measurements, closed-form equations references or standard reference problems values. Besides, the aforementioned index must be qualitatively interpreted using established and objective criteria, mimicking the perception of individuals or teams of expert engineers and aiding them in the interpretation process. So far, this problem has been addressed by the standardized Feature Selective Validation (FSV) method which has become the most widespread technique in the validation of CEM. Nonetheless, the FSV has some drawbacks which have driven subsequent and non consolidated enhancements proposed to improve its performance under specific situations. This paper proposes a global and normalized mutual information based index that includes feature selective considerations as an alternative to evaluate and compare datasets involved in the validation of CEM. Finally, three numerical examples are developed using the presented methodology and the results are compared with the overall indicator for the amplitude and the feature measures obtained using the FSV. The results suggest that the proposed index is able to provide intuitive, consistent and compressive interpretation about the global results of the validation process. Nevertheless, research must be continued in order to refine the proposed method and testing its complete range of applicability and suitability.

  • Improved EMC test methods in industrial environments

     Silva Martinez, Fernando
    Competitive project

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  • In vivo electrical bioimpedance characterization of human lung tissue during the bronchoscopy procedure. A feasibility study

     Sánchez Terrones, Benjamín; Vandersteen, Gerd; Martín Robles, Irene; Castillo Villegas, Diego; Torrego Fernández, Alfons; Riu Costa, Pere Joan; Schoukens, Johan; Bragos Bardia, Ramon
    Medical engineering and physics
    Vol. 35, num. 7, p. 949-957
    DOI: 10.1016/j.medengphy.2012.09.004
    Date of publication: 2013-07
    Journal article

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    Lung biopsies form the basis for the diagnosis of lung cancer. However, in a significant number of cases bronchoscopic lung biopsies fail to provide useful information, especially in diffuse lung disease, so more aggressive procedures are required. Success could be improved using a guided electronic biopsy based on multisine electrical impedance spectroscopy (EIS), a technique which is evaluated in this paper. The theoretical basis of the measurement method and the instrument developed are described, characterized and calibrated while the performance of the instrument is assessed by experiments to evaluate the noise and nonlinear source of errors from measurements on phantoms. Additional preliminary results are included to demonstrate that it is both feasible and safe to monitor in vivo human lung tissue electrical bioimpedance (EBI) during the bronchoscopy procedure. The time required for performing bronchoscopy is not extended because the bioimpedance measurements, present no complications, tolerance problems or side effects among any of the patients measured.

    Lung biopsies form the basis for the diagnosis of lung cancer. However, in a significant number of cases bronchoscopic lung biopsies fail to provide useful information, especially in diffuse lung disease, so more aggressive procedures are required. Success could be improved using a guided electronic biopsy based on multisine electrical impedance spectroscopy (EIS), a technique which is evaluated in this paper. The theoretical basis of the measurement method and the instrument developed are described, characterized and calibrated while the performance of the instrument is assessed by experiments to evaluate the noise and nonlinear source of errors from measurements on phantoms. Additional preliminary results are included to demonstrate that it is both feasible and safe to monitor in vivo human lung tissue electrical bioimpedance (EBI) during the bronchoscopy procedure. The time required for performing bronchoscopy is not extended because the bioimpedance measurements, present no complications, tolerance problems or side effects among any of the patients measured.

  • 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
    Vol. 111, num. 1, p. 33-40
    DOI: 10.1016/j.cmpb.2013.02.009
    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.

  • Healthy Life style and Drowsiness Prevention-HEALING DROP

     Fernandez Chimeno, Mireya
    Competitive project

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  • Analysis of pre-processing techniques when using validation methods in computational electromagnetic simulations

     Jauregui Telleria, Ricardo; Ventosa Llopart, Josep Oriol; Silva Martinez, Fernando; Kunze, Marco
    IET science measurement and technology
    Vol. 7, num. 3, p. 151-156
    DOI: 10.1049/iet-smt.2012.0129
    Date of publication: 2013-05
    Journal article

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    In computational electromagnetic simulations, most validation methods have been developed to quantify the similarity of two datasets, making them an objective tool for test engineers to discuss data on a similar basis. However, these methods do not always agree with the expert's opinion. The main problem when a validation method is used, is not taking into account the 'preprocessing' required by the expert to analyse a particular characteristic in the comparison. In this study, two different preprocessing techniques are used to show the influence they have on the results of the validation methods in relation to the opinion of the expert. The Institution of Engineering and Technology 2013.

  • The use of regions of interest (ROI) in the estimation of total ventilation in COPD patients by means of EIT

     Riu Costa, Pere Joan; Balleza Ordaz, José Marco; Pérez Alday, Erick Andrés; Vargas Luna, José Miguel
    International Conference on Electrical Bio-impedance
    p. 105
    Presentation's date: 2013-04-25
    Presentation of work at congresses

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  • Low cost EIT system for monitoring the sausage ripening process in food industry

     Bragos Bardia, Ramon; Guasch Petit, Antonio; Sánchez Terrones, Benjamín; Giovinazzo, Giuseppe; Rosell Ferrer, Francisco Javier; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    p. 89
    Presentation's date: 2013-04-24
    Presentation of work at congresses

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  • (1559-8985) Progress in electromagnetics research (PIER)

     Azpúrua Auyanet, Barón Marco Aurelio
    Collaboration in journals

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  • Access to the full text
    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
    Vol. 26, num. 1, p. 53-59
    DOI: 10.1016/j.ast.2012.02.013
    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.

  • Textile electrode characterization: Dependencies in the skin-clothing-electrode interface

     Macias Macias, Raul; Fernandez Chimeno, Mireya; Bragos Bardia, Ramon
    International Conference on Electrical Bio-impedance
    p. 012024-1-012024-4
    DOI: 10.1088/1742-6596/434/1/012024
    Presentation's date: 2013-04
    Presentation of work at congresses

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    Given the advances in the technology known as smart textiles, the use of textile electrodes is more and more common. However this kind of electrodes presents some differences regarding the standard ones as the Ag-AgCl electrodes. Therefore to characterize them as best as possible is required. In order to make the characterization reproducible and repetitive, a skin dummy made of agar-agar and a standardized measurement set-up is used in this article. Thus, some dependencies in the skin-electrode interface are described. These dependencies are related to the surface of the textile electrode, the conductive material and the applied pressure. Furthermore, the dependencies on clothing in the skin-textile electrode interface are also analyzed. Thus, based on some parameters such as textile material, width and number of layers, the behavior of the interface made up by the skin, the textile electrode and clothing is depicted.

    Given the advances in the technology known as smart textiles, the use of textile electrodes is more and more common. However this kind of electrodes presents some differences regarding the standard ones as the Ag-AgCl electrodes. Therefore to characterize them as best as possible is required. In order to make the characterization reproducible and repetitive, a skin dummy made of agar-agar and a standardized measurement set-up is used in this article. Thus, some dependencies in the skin-electrode interface are described. These dependencies are related to the surface of the textile electrode, the conductive material and the applied pressure. Furthermore, the dependencies on clothing in the skin-textile electrode interface are also analyzed. Thus, based on some parameters such as textile material, width and number of layers, the behavior of the interface made up by the skin, the textile electrode and clothing is depicted.

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

     Mañanas Villanueva, Miguel Angel; Ramos Castro, Juan Jose
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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
    p. 243-248
    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.

  • 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
    p. 14-20
    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.

    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

  • 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
    p. 57-63
    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