http://hdl.handle.net/2117/1116 Wed, 22 May 2013 19:25:53 GMT 2013-05-22T19:25:53Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18975 Title: Impartició d'una assignatura d'electrònica digital per mitjà d'exercicis Authors: Jordana Barnils, José; Sánchez Robert, Francesc Josep Wed, 24 Apr 2013 10:29:32 GMT http://hdl.handle.net/2117/18975 2013-04-24T10:29:32Z Jordana Barnils, José; Sánchez Robert, Francesc Josep no http://hdl.handle.net/2117/18115 Title: Drowsiness detection by thoracic effort signal snalysis with professional drivers in real environments Authors: Rodriguez Ibañez, Noelia; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya Abstract: 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. Thu, 07 Mar 2013 10:17:05 GMT http://hdl.handle.net/2117/18115 2013-03-07T10:17:05Z Rodriguez Ibañez, Noelia; García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya no 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. http://hdl.handle.net/2117/18114 Title: Electromagnetic interference prediction in an in-house power-line Authors: Samso, Margarita; Ribó, Miquel; Sanchez, Albert-Miquel; Regué, J.R.; Aragon Homar, Marc; Silva Martínez, Fernando Abstract: Abstract —In this paper a new methodology for the prediction of the conducted-emission propagation in an in-house power- line network is presented. This methodology is based on the modal S -parameter characterization of the devices present in the power-line network, as well as on the modal modeling of branch- line connections. The modal S parameters relate common- and di ff erential-mode waves, and give more information regarding interference propagation. With this methodology, common- and di ff erential-mode attenuations, and modal conversion between common and di ff erential modes can be accurately predicted, which is of great interest for power-line communication devel- opment and conducted-emission mitigation. This methodology is tested by accurately predicting the interference levels up to 100 MHz of an in-house power-line network composed by thermal- magnetic circuit breakers, residual-current circuit breakers, single-phase wires and light bulbs. Thu, 07 Mar 2013 09:28:48 GMT http://hdl.handle.net/2117/18114 2013-03-07T09:28:48Z Samso, Margarita; Ribó, Miquel; Sanchez, Albert-Miquel; Regué, J.R.; Aragon Homar, Marc; Silva Martínez, Fernando no Abstract —In this paper a new methodology for the prediction of the conducted-emission propagation in an in-house power- line network is presented. This methodology is based on the modal S -parameter characterization of the devices present in the power-line network, as well as on the modal modeling of branch- line connections. The modal S parameters relate common- and di ff erential-mode waves, and give more information regarding interference propagation. With this methodology, common- and di ff erential-mode attenuations, and modal conversion between common and di ff erential modes can be accurately predicted, which is of great interest for power-line communication devel- opment and conducted-emission mitigation. This methodology is tested by accurately predicting the interference levels up to 100 MHz of an in-house power-line network composed by thermal- magnetic circuit breakers, residual-current circuit breakers, single-phase wires and light bulbs. http://hdl.handle.net/2117/18089 Title: Changes in heart rate variability indexes due to drowsiness in professional drivers measured in a real environment Authors: García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José Abstract: 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. Wed, 06 Mar 2013 10:56:40 GMT http://hdl.handle.net/2117/18089 2013-03-06T10:56:40Z García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José no 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. http://hdl.handle.net/2117/18085 Title: A novel index based on fractional calculus to assess the dynamics of heart rate variability: changes due to chi or yoga meditations Authors: García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya Abstract: 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. Wed, 06 Mar 2013 10:40:14 GMT http://hdl.handle.net/2117/18085 2013-03-06T10:40:14Z García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya no 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. http://hdl.handle.net/2117/18071 Title: Heart rate variability analysis using a seismocardiogram signal Authors: Ramos Castro, Juan José; Moreno, J.; Miranda-Vidal, H.; García González, Miguel Ángel; Fernández Chimeno, Mireya; Rodas, G.; Capdevila, L. Abstract: 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. Tue, 05 Mar 2013 13:11:10 GMT http://hdl.handle.net/2117/18071 2013-03-05T13:11:10Z Ramos Castro, Juan José; Moreno, J.; Miranda-Vidal, H.; García González, Miguel Ángel; Fernández Chimeno, Mireya; Rodas, G.; Capdevila, L. no 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. http://hdl.handle.net/2117/17903 Title: Influence of electrical stimulation on 3D-cultures of Adipose Tissue Derived Progenitor Cells (ATDPCs) behavior Authors: Castells-Sala, C.; Sánchez Terrones, Benjamín; Recha-Sancho, L.; Puig, V.; Bragós Bardia, Ramon; Semino, C.E. Abstract: Tissue engineering has a fundamental role in regenerative medicine. Still today, the major motivation for cardiac regeneration is to design a platform that enables the complete tissue structure and physiological function regeneration of injured myocardium areas. Although tissue engineering approaches have been generally developed for two-dimensional (2D) culture systems, three-dimensional (3D) systems are being spotlighted as the means to mimic better in vivo cellular conditions. This manuscript examines the influence of electrical stimulation on 3D cultures of adipose tissue-derived progenitor cells (ATDPCs). ATDPCs cells were encapsulated into a self-assembling peptide nanoscaffold (RAD16-I) and continuously electro stimulated during 14-20 days with 2-ms pulses of 50mV/cm at a frequency of 1 Hz. Good cellular network formation and construct diameter reduction was observed in electro stimulated samples. Importantly, the process of electro stimulation does not disrupt cell viability or connectivity. As a future outlook, differentiation studies to cardiomyocytes-like cells will be performed analyzing gene profile and protein expression. Thu, 21 Feb 2013 09:59:28 GMT http://hdl.handle.net/2117/17903 2013-02-21T09:59:28Z Castells-Sala, C.; Sánchez Terrones, Benjamín; Recha-Sancho, L.; Puig, V.; Bragós Bardia, Ramon; Semino, C.E. no Tissue engineering has a fundamental role in regenerative medicine. Still today, the major motivation for cardiac regeneration is to design a platform that enables the complete tissue structure and physiological function regeneration of injured myocardium areas. Although tissue engineering approaches have been generally developed for two-dimensional (2D) culture systems, three-dimensional (3D) systems are being spotlighted as the means to mimic better in vivo cellular conditions. This manuscript examines the influence of electrical stimulation on 3D cultures of adipose tissue-derived progenitor cells (ATDPCs). ATDPCs cells were encapsulated into a self-assembling peptide nanoscaffold (RAD16-I) and continuously electro stimulated during 14-20 days with 2-ms pulses of 50mV/cm at a frequency of 1 Hz. Good cellular network formation and construct diameter reduction was observed in electro stimulated samples. Importantly, the process of electro stimulation does not disrupt cell viability or connectivity. As a future outlook, differentiation studies to cardiomyocytes-like cells will be performed analyzing gene profile and protein expression. http://hdl.handle.net/2117/17902 Title: Minimally invasive in vivo human lung tissue bioimpedance measurements during the bronchoscopy procedure Authors: Sánchez Terrones, Benjamín; Vandersteen, G.; Martin, I.; Castillo, David; Torrego, A.; Riu Costa, Pere Joan; Schoukens, J.; Bragós Bardia, Ramon Abstract: Respiratory diseases, which include diseases of the lung, pleura, bronchial tree, trachea, upper respiratory tract and of the respiratory muscles and nerves, are a common and important cause of illness and death among the population. Experimental evidences have shown that tissue lesions have different electrical properties compared with normal tissue. Therefore, lung tissues lesions may be differentiated from lung normal tissue by comparing the tissue passive electrical properties. The manuscript reports a feasibility study for minimally invasive in vivo human lung tissue tetrapolar bioimpedance measurements using a catheter during the bronchoscopy procedure based on multisine Electrical Impedance Spectroscopy (EIS) at 10 kHz - 1 MHz. Thu, 21 Feb 2013 09:51:43 GMT http://hdl.handle.net/2117/17902 2013-02-21T09:51:43Z Sánchez Terrones, Benjamín; Vandersteen, G.; Martin, I.; Castillo, David; Torrego, A.; Riu Costa, Pere Joan; Schoukens, J.; Bragós Bardia, Ramon no Respiratory diseases, which include diseases of the lung, pleura, bronchial tree, trachea, upper respiratory tract and of the respiratory muscles and nerves, are a common and important cause of illness and death among the population. Experimental evidences have shown that tissue lesions have different electrical properties compared with normal tissue. Therefore, lung tissues lesions may be differentiated from lung normal tissue by comparing the tissue passive electrical properties. The manuscript reports a feasibility study for minimally invasive in vivo human lung tissue tetrapolar bioimpedance measurements using a catheter during the bronchoscopy procedure based on multisine Electrical Impedance Spectroscopy (EIS) at 10 kHz - 1 MHz. http://hdl.handle.net/2117/17899 Title: Help4Mood: testing and achievements of the first wireless sensor network prototype Authors: Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Colomé Castellví, Josep Maria Abstract: 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 Wed, 20 Feb 2013 16:51:31 GMT http://hdl.handle.net/2117/17899 2013-02-20T16:51:31Z Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Colomé Castellví, Josep Maria no 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 http://hdl.handle.net/2117/17864 Title: Using smartphone bases biodevices for analyzing physiological, psychological and behavioral user’s habits Authors: Guede Fernández, Federico; Pous Solà, Marc; García González, Miguel Ángel; Capdevila Ortis, Lluís; Ramos Castro, Juan José; Fernández Chimeno, Mireya Abstract: 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. Mon, 18 Feb 2013 17:19:53 GMT http://hdl.handle.net/2117/17864 2013-02-18T17:19:53Z Guede Fernández, Federico; Pous Solà, Marc; García González, Miguel Ángel; Capdevila Ortis, Lluís; Ramos Castro, Juan José; Fernández Chimeno, Mireya no 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. http://hdl.handle.net/2117/17723 Title: A wireless sensor network design for the Help4Mood european project Authors: Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Castro Robles, Joan Carles Abstract: 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. Wed, 13 Feb 2013 14:33:25 GMT http://hdl.handle.net/2117/17723 2013-02-13T14:33:25Z Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Castro Robles, Joan Carles no 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. http://hdl.handle.net/2117/17139 Title: Automatic system for electroporation of adherent cells growing in standard multi-well plates* Authors: García Sánchez, Tomás; Guitart, Maria; Rosell Ferrer, Francisco Javier; Gomez Foix, Anna Maria; Bragós Bardia, Ramon Abstract: In this study an automatic system is presented to perform electroporation, also known as electropermeabilization, on adherent cells. It is an intention of this system to apply electric field pulses directly to cells growing in standard multiwell plates as a step forward to include this technique in standard laboratory protocols. An interdigitated microelectrode assembly constructed with Printed Circuit Board (PCB) is placed closely above the cell monolayer, and in order to avoid direct contact with cells, small micro-separators were included in the structure. Additionally, distribution of current density was modified by filling the gap between adjacent electrodes with a non conductive material as predicted by electric field simulations. This modification helps to concentrate the electric field intensity in the region where cells are present. The device was tested using C2C12 cell line growing adhered in 24 multiwell plates and fluorescent labeled dextran FD20S as the molecule to be delivered. Successful transfection was observed with minimal invasiveness of the operation reducing the stress caused to cells. Mon, 17 Dec 2012 16:32:40 GMT http://hdl.handle.net/2117/17139 2012-12-17T16:32:40Z García Sánchez, Tomás; Guitart, Maria; Rosell Ferrer, Francisco Javier; Gomez Foix, Anna Maria; Bragós Bardia, Ramon no In this study an automatic system is presented to perform electroporation, also known as electropermeabilization, on adherent cells. It is an intention of this system to apply electric field pulses directly to cells growing in standard multiwell plates as a step forward to include this technique in standard laboratory protocols. An interdigitated microelectrode assembly constructed with Printed Circuit Board (PCB) is placed closely above the cell monolayer, and in order to avoid direct contact with cells, small micro-separators were included in the structure. Additionally, distribution of current density was modified by filling the gap between adjacent electrodes with a non conductive material as predicted by electric field simulations. This modification helps to concentrate the electric field intensity in the region where cells are present. The device was tested using C2C12 cell line growing adhered in 24 multiwell plates and fluorescent labeled dextran FD20S as the molecule to be delivered. Successful transfection was observed with minimal invasiveness of the operation reducing the stress caused to cells. http://hdl.handle.net/2117/17105 Title: Simulation of a magnetic induction method for determining passive electrical property changes of human trunk due to vital activities Authors: Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier Abstract: Determining the changes in passive electrical properties of human tissues and the geometry changes of the body parts due to breathing and cardiac activity could be a method for monitoring these vital signs. We have designed a model with COMSOL Multiphysics to simulate a magnetic induction method for determining changes of these characteristics. Given the large number of parameters and variables, difficulties of anatomical modeling and various tissue properties, we are facing some numerical challenges. In addition, using magnetic induction method, we have to consider safety issues, standards and limitations. We used COMSOL to simulate the induced currents in the human body and the resulting perturbation in the magnetic field for different tissue properties and geometries. As a result, we obtained the expected changes during breathing and we know the minimum distances and maximum excitation currents that could be used to meet the international safety standards. Tue, 11 Dec 2012 17:22:11 GMT http://hdl.handle.net/2117/17105 2012-12-11T17:22:11Z Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier no Determining the changes in passive electrical properties of human tissues and the geometry changes of the body parts due to breathing and cardiac activity could be a method for monitoring these vital signs. We have designed a model with COMSOL Multiphysics to simulate a magnetic induction method for determining changes of these characteristics. Given the large number of parameters and variables, difficulties of anatomical modeling and various tissue properties, we are facing some numerical challenges. In addition, using magnetic induction method, we have to consider safety issues, standards and limitations. We used COMSOL to simulate the induced currents in the human body and the resulting perturbation in the magnetic field for different tissue properties and geometries. As a result, we obtained the expected changes during breathing and we know the minimum distances and maximum excitation currents that could be used to meet the international safety standards. http://hdl.handle.net/2117/17104 Title: Simulation of a magnetic induction method for determining passive electrical property changes of human trunk due to vital activities Authors: Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier Tue, 11 Dec 2012 17:05:58 GMT http://hdl.handle.net/2117/17104 2012-12-11T17:05:58Z Mahdavi, Hadiseh; Rosell Ferrer, Francisco Javier no http://hdl.handle.net/2117/16651 Title: Towards on line monitoring the evolution of the myocardium infarction scar with an implantable electrical impedance spectrum monitoring system. Authors: Bragós Bardia, Ramon; Sánchez Terrones, Benjamín; Guasch, Assumpció; Bogónez Franco, Francisco; Gálvez-Montón, C.; Puig, V.; Prat-Vidal, C.; Semino, C.E.; Bayés-Genis, Antoni Abstract: The human heart tissue has a limited capacity for regeneration. Tissue and cellular therapies based on the use of stem cells may be useful alternatives to limit the size of myocardial infarction. In this paper, the preliminary results from an experimental campaign for on-line monitoring of myocardium scar infarction are presented. This study has been carried out under a research project that has as main objective the development and application of a bioactive patch implant for regeneration of myocardial infarction. Electrical Impedance Spectroscopy (EIS) has been chosen as a tissue state monitoring technique. What is presented in this communication is the first results of an implantable EIS measurement system which has been implanted in a subset of the animals corresponding to the control group, along one month. In all the animals, the myocardial infarction was induced by the ligation of the first circumflex marginal artery. In the animal group presented,the bioactive patch scaffold and the electrodes were implanted without the stem cells load. The scaffold is a piece of decellularized human pericardium, lyophilized and rehydrated with hydrogel RAD16-I. Nanogold particles were also placed near the electrodes to improve the electrode area conductivity. The results presented correspond to the subset of animals (n = 5), which had implanted the bioimpedance system monitoring the electrical impedance spectrum in vivo during 1 month. Two electrodes were connected to the bioactive patch implant. A total of 14 logarithmically spaced frequencies were measured every 5 minutes, from 100 Hz to 200 kHz. Results show a convergence of low-frequency and high frequency impedance magnitudes along the measurement period, which is coherent with the scar formation. Thu, 04 Oct 2012 17:44:07 GMT http://hdl.handle.net/2117/16651 2012-10-04T17:44:07Z Bragós Bardia, Ramon; Sánchez Terrones, Benjamín; Guasch, Assumpció; Bogónez Franco, Francisco; Gálvez-Montón, C.; Puig, V.; Prat-Vidal, C.; Semino, C.E.; Bayés-Genis, Antoni no The human heart tissue has a limited capacity for regeneration. Tissue and cellular therapies based on the use of stem cells may be useful alternatives to limit the size of myocardial infarction. In this paper, the preliminary results from an experimental campaign for on-line monitoring of myocardium scar infarction are presented. This study has been carried out under a research project that has as main objective the development and application of a bioactive patch implant for regeneration of myocardial infarction. Electrical Impedance Spectroscopy (EIS) has been chosen as a tissue state monitoring technique. What is presented in this communication is the first results of an implantable EIS measurement system which has been implanted in a subset of the animals corresponding to the control group, along one month. In all the animals, the myocardial infarction was induced by the ligation of the first circumflex marginal artery. In the animal group presented,the bioactive patch scaffold and the electrodes were implanted without the stem cells load. The scaffold is a piece of decellularized human pericardium, lyophilized and rehydrated with hydrogel RAD16-I. Nanogold particles were also placed near the electrodes to improve the electrode area conductivity. The results presented correspond to the subset of animals (n = 5), which had implanted the bioimpedance system monitoring the electrical impedance spectrum in vivo during 1 month. Two electrodes were connected to the bioactive patch implant. A total of 14 logarithmically spaced frequencies were measured every 5 minutes, from 100 Hz to 200 kHz. Results show a convergence of low-frequency and high frequency impedance magnitudes along the measurement period, which is coherent with the scar formation.