- Mokhtar ATTARI is a Professor at the Faculty of Electrical Engineering (USTHB) and an Invited Professor at the Higher... moreMokhtar ATTARI is a Professor at the Faculty of Electrical Engineering (USTHB) and an Invited Professor at the Higher School of Engineers (ESDAT), where he teaches Electronics, Instrumentation, and Metrology to Master's and Engineering students. He graduated as an Engineer in Electronics from the Ecole Nationale Polytechnique d’Alger in 1985, and obtained a Diplôme d’Etudes Approfondies (DEA) and a Doctorate of Sciences in Instrumentation and Measurement from Grenoble Institute of Technology (Grenoble-INP) and the University of Grenoble Alpes (UGA), Grenoble, France, respectively in 1987 and 1991. He obtained a Doctorat d’Etat in Electrical Engineering in 1995. In 1996, he was appointed Director of the Institute of the current faculty for a period of five years, and in 2005 he was elected Director of the Laboratory of Instrumentation Research for three consecutive terms. During the year 2000 to 2001, he was invited to Bologna at the IMM laboratory of the Italian CNR, where he mainly worked on the characterization of microelectronic devices. His research work focuses on the design of sensors and signal conditioners, intelligent techniques for correcting sensor characteristics, biomedical instrumentation of physiological signals, physical rehabilitation and mechatronics for automotive. He has led research projects with economic impact and supervised several dissertations of Technicians, Bachelors, Engineers, Masters, and Doctoral theses, and published more than a hundred contributions, including two books as well as in journals and internationally renowned scientific conferences. He has participated in the organization of several seminars and conferences in the field and works as an expert member in the IEEE Sensor Journal.edit
Premature ventricular contraction (PVC), which is a common form of cardiac arrhythmia caused by ectopic heartbeat, can lead to life-threatening cardiac conditions. Computer-aided PVC detection is of considerable importance in medical... more
Premature ventricular contraction (PVC), which is a common form of cardiac arrhythmia caused by ectopic heartbeat, can lead to life-threatening cardiac conditions. Computer-aided PVC detection is of considerable importance in medical centers or outpatient ECG rooms. In this paper, we proposed a new approach that combined deep neural networks and rules inference for PVC detection. The detection performance and generalization were studied using publicly available databases: the MIT-BIH arrhythmia database (MIT-BIH-AR) and the Chinese Cardiovascular Disease Database (CCDD). The PVC detection accuracy on the MIT-BIH-AR database was 99.41%, with a sensitivity and specificity of 97.59% and 99.54%, respectively, which were better than the results from other existing methods. To test the generalization capability, the detection performance was also evaluated on the CCDD. The effectiveness of the proposed method was confirmed by the accuracy (98.03%), sensitivity (96.42%) and specificity (98.06%) with the dataset over 140,000 ECG recordings of the CCDD.
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Patient biopotentials are usually measured with conventional disposable Ag/AgCl electrodes. These electrodes provide excellent signal quality but are irritating for long-term use. Skin preparation is usually required prior to the... more
Patient biopotentials are usually measured with conventional disposable Ag/AgCl electrodes. These electrodes provide excellent signal quality but are irritating for long-term use. Skin preparation is usually required prior to the application of electrodes such as shaving and cleansing with alcohol. To overcome these difficulties, researchers and caregivers seek alternative electrodes that would be acceptable in clinical and research environments. Dry electrodes that operate without gel, adhesive or even skin preparation have been studied for many decades. They are used in research applications, but they have yet to achieve acceptance for medical use. So far, a complete comparison and evaluation of dry electrodes is not well described in the literature. This work compares dry electrodes for biomedical use and physiological research, and reviews some novel systems developed for cardiac monitoring. Lastly, the paper provides suggestions to develop a dry-electrode-based system for mobile and long-term cardiac monitoring applications.
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ABSTRACT An embedded hardware-software Electrocardiogram platform had been conceived, were the design of the Einthoven's lead DI was been described. The system is based on the use of dry electrodes which had been set on three... more
ABSTRACT An embedded hardware-software Electrocardiogram platform had been conceived, were the design of the Einthoven's lead DI was been described. The system is based on the use of dry electrodes which had been set on three points of the body skin, the sensed signal fed an analog signal pre-processor to enhance its level and improve its noise immunity. The analog processor includes a typical filtering in two bands: the first band B1 is from 0.05 to 40Hz and the second B2 is from 0.05 to 150Hz. Since the analog signal approaches both the desired level and signal to noise ratio, a digital circuit based on microcontroller (AN2131QC) transforms the signal across a normalized USB bus transfer. In any cases, the embedded system could communicate in real time directly to a computer with USB port. Several data acquisition and recording file have been accomplished. Then, some processing tools have been implemented under MATLAB software as the representation of the ECG signals and its spectrum analysis for furthers offline processing.
Research Interests: Computer Science, Computer Hardware, Digital Circuits, Electrocardiography, Software, and 15 moreNoise, Hardware, Data acquisition, Microcontroller, Real Time, Electrocardiogram, Spectrum analysis, Band Pass Filter, Electrodes, Electrode, Bandwidth, Signal to Noise Ratio, Embedded System, HID, and Band pass filters
ABSTRACT In clinical practice, postural stability is commonly evaluated by scored balance performance of body sway on a platform. In this work, a platform with reaction force measurement is realized for postural balance analysis. A... more
ABSTRACT In clinical practice, postural stability is commonly evaluated by scored balance performance of body sway on a platform. In this work, a platform with reaction force measurement is realized for postural balance analysis. A Microsystems based on microcontroller was built in order to drive the instrumentation and a graphical user interface has also realized. After calibration, experimentation test of postural balance conducted by subject has been carried.
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ABSTRACT In the present paper, we present the design of a USB-based data acquisition system to record Electromyogram signal (EMG). Three gelled Silver/Silver chloride (Ag/AgCl) electrodes were set on the upper layer of the skin surface... more
ABSTRACT In the present paper, we present the design of a USB-based data acquisition system to record Electromyogram signal (EMG). Three gelled Silver/Silver chloride (Ag/AgCl) electrodes were set on the upper layer of the skin surface (stratum corneum) in all the conducted experiments. The raw signal which is a low level voltage (µV to mV), is processed and filtered by a low-power consumption amplifier. The analog signal was digitized by an AN2131QC microcontroller kit based on the 8051 industrial core. The data were instantly sent to a laptop through a USB link. Then, some processing tools were built around MATLAB software and were applied to the data for temporal and frequenciel representation of the corresponding electromyogram signal.
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... S. Boukhenous and M. Attari Laboratory of Instrumentation, Faculty of Electronics and ComputersUSTHB, BP. 32, Bab-Ezzouar, 16111, Algeria, http://www.lins.usthb.dz sboukhenous@gmail. com, attari.mo@gmail.com ABSTRACT ... IEEE Eng.... more
... S. Boukhenous and M. Attari Laboratory of Instrumentation, Faculty of Electronics and ComputersUSTHB, BP. 32, Bab-Ezzouar, 16111, Algeria, http://www.lins.usthb.dz sboukhenous@gmail. com, attari.mo@gmail.com ABSTRACT ... IEEE Eng. Med. and Bio., pp 28-31, 1992. ...
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In this paper, a transducer based instrument for fingertip touch force is developed. As a diagnostic tool, the system was coupled with an EMG analog signal processor, which is considered as the main basis of evaluation for motor function... more
In this paper, a transducer based instrument for fingertip touch force is developed. As a diagnostic tool, the system was coupled with an EMG analog signal processor, which is considered as the main basis of evaluation for motor function impairment. A software program is developed to analyze EMG signal during fingertips effort to obtain valid characteristic parameters with spectral analysis. These parameters are associated with a low cost grip transducer based on Hall Effect component developed for the improvement of fingertip movement during holding objects or training exercises. Thus, the changes on each sensor signal can be detected and monitored with the software interface. The output signal and the EMG analog processor are feeding a high resolution data acquisition system of National Instrument. Preliminary experimental tests have been carried out for the fingertip force grasping according to the Adductor Pollicis muscle (AdP) for controlling the adductive motion of the thumb. The experimental results show that the changes of dynamic fingertip force affect the muscle.
Research Interests: Computer Science, Skeletal muscle biology, Neurophysiology, Medicine, Humans, and 15 moreData acquisition, Biocontrol, Electromyography, Conference Proceedings, High Resolution, Mechanical Stress, Skeletal Muscle, Motor Function, Experimental Tests, Hall effect, Fingers, Equipment Design, Data Acquisition System, Diagnostic Tool, and Hand strength
L'objet de ce travail a porte sur l'etude et la realisation de bancs de tests automatiques de capteurs electrochimiques de type potentiometrique. La mise au point de nouveaux systemes necessite en premier lieu des etudes de... more
L'objet de ce travail a porte sur l'etude et la realisation de bancs de tests automatiques de capteurs electrochimiques de type potentiometrique. La mise au point de nouveaux systemes necessite en premier lieu des etudes de faisabilite dont le domaine de sensibilite, la selectivite aux ions interferents et la duree de vie. Deux systemes d'acquisition de reponse en regime statique ont ete mis au point. Le premier repose sur un assemblage d'instruments commerciaux qu'il a fallu adapter a la situation (multiplexage a tres haute impedance, mis au point de logiciels). L'autre a ete concu autour d'un microcontroleur autonome qui gere les taches d'acquisition sur des durees programmables. En fin de cycle, les donnees sont transmises a un microordinateur par une liaison serie rs 232. Les instruments ont ete testes sur de nouveaux capteurs. Les materiaux ionosensibles utilises pour ces capteurs sont tres performantes et le temps de reponse n'est plus mesurable par les methodes traditionnelles. Un nouveau banc de mesure de ce parametre a ete concu a partir d'une etude bibliographique. Le systeme repose sur une commutation de jets de solutions tres rapide (temps de commutation de l'ordre de la ms) et sur une disposition particuliere des electrodes de reference. Une carte speciale a ete concu pour cet usage, un soin particulier a ete apporte a la minimisation du bruit. Les etudes faites sur de nouveaux capteurs a sodium (a base de nasicon) ont donne des temps de reponse de quelques dizaines de millisecondes, soit des reponses au moins dix fois plus rapides que celles des electrodes commerciales. Les resultats experimentaux ont ete confrontes aux modeles theoriques etablis. Des phenomenes nouveaux de reponse transitoire aux ions interferents ont egalement ete observes
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ABSTRACT The aim of this work is the realization of a strain gauge platform for studying the human body gesture. This mechanical system is fed by a special instrumentation for measuring the ground reaction force during a vertical jumping... more
ABSTRACT The aim of this work is the realization of a strain gauge platform for studying the human body gesture. This mechanical system is fed by a special instrumentation for measuring the ground reaction force during a vertical jumping phase. Four composites sensors that support the whole rigid plate were realized with metallic strain gauges. The low level signal at the output was carefully amplified and earned out to a PC computer via a special data acquisition card for subsequent signal analysis. In this paper, special features were dedicated to study the whole phase during successive jumps conducted by an athlete and experimental tests have been carried out for this purpose. The output signals were reported and a particularity was given to the power spectrum when the athlete takes off. The analysis puts into evidence the vertical jumping behavior and anomalies is especially studied in the falling down moment.
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ABSTRACT In this paper, the design and realization of a sensing device for recording dynamics characteristics of handwriting is developed. The device is realized with light materials for embedding forces and inertial sensors in small... more
ABSTRACT In this paper, the design and realization of a sensing device for recording dynamics characteristics of handwriting is developed. The device is realized with light materials for embedding forces and inertial sensors in small space. A microsystem based on cortex M3 processor is realized to perform data acquisition of the measured signals and to carry out the data via serial transmission to a Notebook for subsequent signal processing. First experimental results have shown the effectiveness of the proposed device for recording accelerations in 3D, angular velocities in pitch and roll, the pressure of index and thumb and the reaction force on a plane surface. For instance, subjects of different ethnic and different skill have been taken into account for handwriting behavior study.
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This paper describes a pinch grip sensor prototype for measuring fingertip force grasping in biomedical application. The force sensor element is based on the Hall Effect devices. The sensing element was mounted on a pinch grip instrument... more
This paper describes a pinch grip sensor prototype for measuring fingertip force grasping in biomedical application. The force sensor element is based on the Hall Effect devices. The sensing element was mounted on a pinch grip instrument and the output signal issued from the sensor is carried out to a low cost instrumentation amplifier. After analog processing and filtering, the
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ABSTRACT The foot and ankle contribute significantly to postural control by providing a contact area to the support surface. Persons with visual and neuromuscular disorders have deficits in response to perturbations of balance and often... more
ABSTRACT The foot and ankle contribute significantly to postural control by providing a contact area to the support surface. Persons with visual and neuromuscular disorders have deficits in response to perturbations of balance and often require assistive devices. This work investigated to posture analysis by using plantar pressure measurements coupled with an EMG analog signal processor. The output signals from the plantar pressure and the EMG analog processor are feeding to a high resolution data acquisition system of National Instrument data acquisition card with PCI interfacing to a PC. Experimental tests have been carried out concerning the postural stability conducted by subjects with eyes open and closed. However, an analog circuit has been realized for recording the EMG signal of Soleus muscle during the experimentation tests.
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The ultrasound devices for assessing the human tibia are based on detecting the first arriving signal, corresponding to a wave propagating at, or close to, the bulk longitudinal velocity in bone. However, human long bones are effectively... more
The ultrasound devices for assessing the human tibia are based on detecting the first arriving signal, corresponding to a wave propagating at, or close to, the bulk longitudinal velocity in bone. However, human long bones are effectively irregular hollow tubes and should theoretically support the propagation of more complex guided modes similar to Lamb waves in plates. Guided waves are
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ABSTRACT In this work, two-degree-of-freedom (2DOF) platform for ankle sprain rehabilitation is designed and realized. These instrumented platforms were designed for clinical rehabilitation of the repetitive movement of ankle with... more
ABSTRACT In this work, two-degree-of-freedom (2DOF) platform for ankle sprain rehabilitation is designed and realized. These instrumented platforms were designed for clinical rehabilitation of the repetitive movement of ankle with changing direction. Four motors have been used for 2DOF motion control. A Microsystems based on microcontroller was realized for driving the whole instrumentation. For proper monitoring of the ankle rehabilitation, we found it useful to insert an accelerometer for measuring the angle of inclination; this measurement is taken from the measurement of static acceleration.
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This paper deals with the noise optimization of a low-power front-end amplifier (FEA) integrating a band-pass filter for EEG signal recording. The AC-coupled and capacitive feedback structures have been adopted in order to reject the... more
This paper deals with the noise optimization of a low-power front-end amplifier (FEA) integrating a band-pass filter for EEG signal recording. The AC-coupled and capacitive feedback structures have been adopted in order to reject the large DC offset generated at the electrode–skin interface. A high open-loop gain with acceptable phase margin was obtained with the proposed operational transconductance amplifier architecture. The methodology to reach a low noise-to-power trade-off is based on selecting the suitable operation region of each transistor, especially the input differential pair by considering the g m / I D parameter. The proposed amplifier was implemented in both 0.13 μm and 0.18 μm CMOS processes with a supply voltage set to ± 1 V. For both technologies, the obtained gain and bandwidth are practically similar, while the phase margin obtained in the first process (0.13 μm) is higher than the one obtained in the second process (0.18 μm); however, both values insure system stability. A lower total input-referred noise of 1.7 µV rms with a noise efficiency factor of 3.4 was obtained in 0.18 µm CMOS process. The designed FEA has been found suitable for ECG biopotential recording.
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This paper highlights the design of a low cost sensing system for the study of foot reaction stress recovering. For instance, measurements are made on Freeman platform for ankle rehabilitation sessions. The system is based on the design... more
This paper highlights the design of a low cost sensing system for the study of foot reaction stress recovering. For instance, measurements are made on Freeman platform for ankle rehabilitation sessions. The system is based on the design of a sensing element and to set it onto a flexible material as a foot shape. The sensor element is based on a Hall Effect device coupled with a magnet in a typical elastic polymer material. The sensors are mounted on a printed circuit board and recovered with a hard polymer layer in order to obtain a uniform distribution of strains. The output signal of each sensing element is carried out to an instrumentation amplifier for adjusting the level of signals and settings. First calibration was performed for the study of the polymer material and then for the mounted sensor element in order to show the feasibility of such stress sensing. After calibration procedure, a dynamic measurement in real environment has been carried out with the instrument bonded onto a Freeman platform.
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... A TACTILE SENSORS ARRAY FOR BIOMEDICAL APPLICATIONS Mokhtar Attari and Samir Boukhenous ... Thus, tactile sensors have been used in hand clinical evaluations and foot rehabilitation [7-9]. 978-1-4244-2206-7/08/$25.00 ©2008 IEEE ...
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ABSTRACT In this work, electrical impedance spectroscopy (EIS) has been used to characterize the electrical properties of the electrode-electrolyte interface and the electrode-skin interface. The impedance was measured from face to face... more
ABSTRACT In this work, electrical impedance spectroscopy (EIS) has been used to characterize the electrical properties of the electrode-electrolyte interface and the electrode-skin interface. The impedance was measured from face to face Ag/AgCl electrode pairs, as well as the impedance of Ag/AgCl electrodes placed on the human body surface, in the frequency band from 0.05Hz to 1MHz. The obtained frequency responses of each interface were analyzed to determine their electrical models, with parameterization of the described impedance models using an optimization program written in Matlab source software. The thermal noises were also calculated for both interfaces.
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A primitive gas recognition system which can discriminate limited species of industrial gas was designed and simulated. The dasiaelectronic nosepsila consists of an array of 8 micro-hotplate based SnO2 thin film gas sensors with different... more
A primitive gas recognition system which can discriminate limited species of industrial gas was designed and simulated. The dasiaelectronic nosepsila consists of an array of 8 micro-hotplate based SnO2 thin film gas sensors with different selectivity patterns, signal collecting unit and a signal pattern recognition and decision part in programmable logic device chip. BP (back propagation) neural networks with Multilayer
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Wearable sensors are useful in the field of robotics, rehabilitation, biomechanics and medicine. In this work, we present a wearable measurement system equipped with a flexible, stretchable and tactile sensors array. The system contains... more
Wearable sensors are useful in the field of robotics, rehabilitation, biomechanics and medicine. In this work, we present a wearable measurement system equipped with a flexible, stretchable and tactile sensors array. The system contains four strain gauges connected to four separate Wheatstone bridges. The strain gauges were embedded into silicone Dragon skin to ensure the necessary properties of a stretchable sensor. We demonstrated the use of the developed wearable bio-instrument for detecting contractions of the subject's biceps muscle by tracking the angular motion of the elbow. The measurements showed good repeatability of the peak amplitude and demonstrated the possibility of detecting wirelessly the different angles of elbow flexion.
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SIGLEINIST T 77606 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
This paper presents an integrated optical receiver which consists of an integrated photodetector, and a transimpedance circuit. A series inductive peaking is used for enhancing the bandwidth. The proposed structure operates at a data rate... more
This paper presents an integrated optical receiver which consists of an integrated photodetector, and a transimpedance circuit. A series inductive peaking is used for enhancing the bandwidth. The proposed structure operates at a data rate of 10 Gb/s with a BER of Iff20 and was implemented in a 0.35 μm CMOS process. The integrated photodiode has a capacitance of 0.01 pF which permits to the structure to achieve a wide bandwidth (5.75 GHz) with only one inductor before the last stage; hence a smaller silicon area is maintained. The proposed TIA has a gain of36.56 dBΩ (67.57 KΩ), and an input courant noise level of about 25.8 pA/Hz0.5. It consumes a DC power of 87.4 mW from 3.3 V supply voltage.
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The QRS complex is the most important component of electrocardiogram (ECG) signals; therefore, its detection is the first step of all kinds of automatic feature extraction and crucial part of an ECG analysis system. The R wave is one of... more
The QRS complex is the most important component of electrocardiogram (ECG) signals; therefore, its detection is the first step of all kinds of automatic feature extraction and crucial part of an ECG analysis system. The R wave is one of the most important sections of the QRS complex, which has an essential role in diagnosis of irregular heartbeats. This paper employs Empirical Wavelet Transform (EWT) and Hilbert transforms as well as by employing Flower Pollination Algorithm (FPA) in order to approach an optimum combinational method for R peak detection. First, the Empirical Wavelet Transform (EWT) is used to eliminate the noise and improve the envelope extraction. The Hilbert envelope is then used to determine the positions of the R waves. Finally, FPA is used to adjust the envelope’s parameters. In the experimental section of this paper, the proposed approach is evaluated using the MIT/BIH database. We show that the proposed method can achieve results that are comparable to the st...
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Noncommunicable diseases (NCDs), also known as chronic diseases (cancers, respiratory and cardiovascular diseases, diabetes…), tend to be of long duration and are the result of a combination of genetic, physiological, environmental and... more
Noncommunicable diseases (NCDs), also known as chronic diseases (cancers, respiratory and cardiovascular diseases, diabetes…), tend to be of long duration and are the result of a combination of genetic, physiological, environmental and behaviors factors. According to the World Health Organization, cardiovascular diseases account for most NCD deaths or 17.9 million people annually. It is well-known that high blood pressure (hypertension) is a frequent and major cardiovascular risk factor involved in the development of stroke, ischemic heart disease, heart failure and dementia. In addition, the estimation of blood pressure can be achieved by determining an important physiological parameter called pulse transit time (PTT), which is the time required for a pulse wave to move between two different arterial points. In this work, we propose three main challenges in embedded systems design: the challenge to build a simple but reliable system and that to build a robust and low-cost system that simultaneously acquires electrocardiogram (ECG) and photoplethysmography (PPG) signals to measure PTT. This system is very useful in outpatient medicine. The ultimate objective to be achieved is to make our prototype smart by using machine learning techniques, and miniaturized as part of the Internet of Things (IoT), which opens up new possibilities in medicine that can give additional insight into symptoms and trends, enable remote care and, in general, give patients more control over their lives and their treatment.
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Patient biopotentials are usually measured with conventional disposable Ag/AgCl electrodes. These electrodes provide excellent signal quality but are irritating for long-term use. Skin preparation is usually required prior to the... more
Patient biopotentials are usually measured with conventional disposable Ag/AgCl electrodes. These electrodes provide excellent signal quality but are irritating for long-term use. Skin preparation is usually required prior to the application of electrodes such as shaving and cleansing with alcohol. To overcome these difficulties, researchers and caregivers seek alternative electrodes that would be acceptable in clinical and research environments. Dry electrodes that operate without gel, adhesive or even skin preparation have been studied for many decades. They are used in research applications, but they have yet to achieve acceptance for medical use. So far, a complete comparison and evaluation of dry electrodes is not well described in the literature. This work compares dry electrodes for biomedical use and physiological research, and reviews some novel systems developed for cardiac monitoring. Lastly, the paper provides suggestions to develop a dry-electrode-based system for mobile and long-term cardiac monitoring applications.
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Artificial neural networks appear as an efficient tool to correct input-output nonlinearities of sensors. In this paper, an artificial neural network (ANN) with two hidden layers used to linearize a static characteristic of a thermistor... more
Artificial neural networks appear as an efficient tool to correct input-output nonlinearities of sensors. In this paper, an artificial neural network (ANN) with two hidden layers used to linearize a static characteristic of a thermistor is discussed. The data used were taken from the input-output calibrating thermistor bridge. Both backpropagation (BP) and random optimization method (ROM) have been combined to
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In this work a low cost electrical muscle stimulator (EMS) is designed and realized. This instrument is dedicated to stimulate muscles and acquire the electromyography (EMG) response. Two electrical circuits are realized, the first based... more
In this work a low cost electrical muscle stimulator (EMS) is designed and realized. This instrument is dedicated to stimulate muscles and acquire the electromyography (EMG) response. Two electrical circuits are realized, the first based on a power stage delivering impulses for the electrical stimulation muscle, the second based on data acquisition system of the EMG signal to measure the response time between the excitation impulses. A graphical interface is developed to display information about the patient, the signal acquisition and the results of the diagnosis. Our application is focused to quantify the degree of muscular fatigue, for this, we chose one of the parameters that define a muscle shock which is the latency. The preliminary experiment is done on the biceps muscle, because the force developed by the motor unit is high. Keywords— EMS, EMG, Stimulation, Muscular fatigue
In this study, a single channel wireless EEG acquisition system is developed for biomedical instrumentation. This system is divided into two parts: analog front end circuit and a digital processing circuit. The analog part includes a... more
In this study, a single channel wireless EEG acquisition system is developed for biomedical instrumentation. This system is divided into two parts: analog front end circuit and a digital processing circuit. The analog part includes a protection circuitry, preamplifier, filters, programmable gain amplifier and DRL circuit. Simulation results of this part have shown a low noise level of about 16nV
Research Interests: Computer Science, Biomedical Engineering, Electroencephalography, Microcontrollers, Noise, and 12 moreData acquisition, Analog Signal Processing, Circuit simulation, Preamplifier, Low Noise, TRANSMITTERS, LCD, Electrodes, Wireless Communication, Data Acquisition System, Analog VLSI Signal Processing, and Single Channel
... Khadidja Saidi, Youcef Remram, Mokhtar Attari ... et al [1], Bossy et al [2], Lefebvre et al [3] and Nicholson et al [4]. In contrast to through-transmission techniques, which require placing a transducer on each side of the bone,... more
... Khadidja Saidi, Youcef Remram, Mokhtar Attari ... et al [1], Bossy et al [2], Lefebvre et al [3] and Nicholson et al [4]. In contrast to through-transmission techniques, which require placing a transducer on each side of the bone, axial transmission techniques can be easily applied to a ...
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... Amin Riad MAOUCHE, Mokhtar ATTARI Laboratory of Instrumentation, Faculty of Electronic and Computer Science, Houari Boumedien University, Algiers ... of the control techniques for flexible manipulators are inspired by classical... more
... Amin Riad MAOUCHE, Mokhtar ATTARI Laboratory of Instrumentation, Faculty of Electronic and Computer Science, Houari Boumedien University, Algiers ... of the control techniques for flexible manipulators are inspired by classical controls [2]-[7]. On other hand, much research ...
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The effect of a point defect excess, vacancies, or, respectively, interstitials, on the deactivation kinetics of As in Si was verified on silicon on insulator (SOI) substrates uniformly doped at concentrations in the range 1.8-7 x1020... more
The effect of a point defect excess, vacancies, or, respectively, interstitials, on the deactivation kinetics of As in Si was verified on silicon on insulator (SOI) substrates uniformly doped at concentrations in the range 1.8-7 x1020 cm-3. SOI samples can provide more accurate carrier density measurements, moreover the buried oxide layer can prevent recombination of excess vacancies with the interstitials
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We designed a spandex tank top with dry electrodes for continuous electrocardiogram (ECG) recording. This pilot study determined the best fabric, the best electrode types, sizes, and locations. Optimal electrodes provide high signal to... more
We designed a spandex tank top with dry electrodes for continuous electrocardiogram (ECG) recording. This pilot study determined the best fabric, the best electrode types, sizes, and locations. Optimal electrodes provide high signal to artifact ratio (SAR) and reliability by meeting the following criteria: 1) low baseline shift, 2) high adhesion, 3) good physical stability, 4) large effective area, 5) thin with high flexibility (Luo et al 1992). We compared electrodes from three main groups: Ag/AgCl gel electrode, commercial conductive rubber and foam-metal based electrodes. Ag/AgCl gel electrodes are easy to apply, make good body contact and do not slip during the course of an experiment. We found that higher SARs are obtained when electrode area is increased (40 mm diameter) and the two dry measurement electrodes are located on convex areas (over chest muscle) rather than concave areas (over sternum), so the spandex will apply light pressure to the dry electrode to yield good elec...
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The aim of this paper is to introduce a new architecture using Artificial Neural Networks (ANN) in designing a 6-bit nonlinear Analog to Digital Converter (ADC). A study was conducted to synthesise an optimal ANN in view to FPGA (Field... more
The aim of this paper is to introduce a new architecture using Artificial Neural Networks (ANN) in designing a 6-bit nonlinear Analog to Digital Converter (ADC). A study was conducted to synthesise an optimal ANN in view to FPGA (Field Programmable Gate Array) implementation using Very High-speed Integrated Circuit Hardware Description Language (VHDL). Simulation and tests results are carried out to show the efficiency of the designed ANN.
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In this work a low cost electrical muscle stimulator (EMS) is designed and realized. This instrument is dedicated to stimulate muscles and acquire the electromyography (EMG) response. Two electrical circuits are realized, the first based... more
In this work a low cost electrical muscle stimulator (EMS) is designed and realized. This instrument is dedicated to stimulate muscles and acquire the electromyography (EMG) response. Two electrical circuits are realized, the first based on a power stage delivering impulses for the electrical stimulation muscle, the second based on data acquisition system of the EMG signal to measure the response time between the excitation impulses. A graphical interface is developed to display information about the patient, the signal acquisition and the results of the diagnosis. Our application is focused to quantify the degree of muscular fatigue, for this, we chose one of the parameters that define a muscle shock which is the latency. The preliminary experiment is done on the biceps muscle, because the force developed by the motor unit is high. Keywords— EMS, EMG, Stimulation, Muscular fatigue
The ankle contributes to postural control and people with visual and neuromuscular trauma have difficulty to maintaining their stability. This requires means resources of diagnosis and rehabilitation of ankle. In this paper, a wireless... more
The ankle contributes to postural control and people with visual and neuromuscular trauma have difficulty to maintaining their stability. This requires means resources of diagnosis and rehabilitation of ankle. In this paper, a wireless sensor system equipped with Force Sensing Resistors (FSR) is developed to measure plantar pressure during rehabilitation ankle. The wireless sensors proved its high accuracy and reliability for measuring high pressure distributions under the foot in real time. The sensed data are collected wirelessly to the base station (BS). This later displays in real time the data on a Graphical User Interface (GUI). Dynamic measurements in a real environment were made with the embedded instrument on a Freeman platform.
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Noncommunicable diseases (), also known as chronic diseases (cancers, respiratory and cardiovascular diseases, diabetes…), tend to be of long duration and are the result of a combination of genetic, physiological, environmental and... more
Noncommunicable diseases (), also known as chronic diseases (cancers, respiratory and cardiovascular diseases, diabetes…), tend to be of long duration and are the result of a combination of genetic, physiological, environmental and behaviors factors. According to the World Health Organization, cardiovascular diseases account for most deaths or 17.9 million people annually. It is well-known that high blood pressure (hypertension) is a frequent and major cardiovascular risk factor involved in the development of stroke, ischemic heart disease, heart failure and dementia. In addition, the estimation of blood pressure can be achieved by determining an important physiological parameter called pulse transit time (PTT), which is the time required for a pulse wave to move between two different arterial points. In this work, we propose three main challenges in embedded systems design: the challenge to build a simple but reliable system and that to build a robust and low-cost system that simul...
ABSTRACT The aim of this work is the realization of a strain gauge platform for studying the human body gesture. This mechanical system is fed by a special instrumentation for measuring the ground reaction force during a vertical jumping... more
ABSTRACT The aim of this work is the realization of a strain gauge platform for studying the human body gesture. This mechanical system is fed by a special instrumentation for measuring the ground reaction force during a vertical jumping phase. Four composites sensors that support the whole rigid plate were realized with metallic strain gauges. The low level signal at the output was carefully amplified and earned out to a PC computer via a special data acquisition card for subsequent signal analysis. In this paper, special features were dedicated to study the whole phase during successive jumps conducted by an athlete and experimental tests have been carried out for this purpose. The output signals were reported and a particularity was given to the power spectrum when the athlete takes off. The analysis puts into evidence the vertical jumping behavior and anomalies is especially studied in the falling down moment.