Georges Nassar | Université de Valenciennes et du Hainaut-Cambrésis (UVHC) (original) (raw)

Papers by Georges Nassar

HAL (Le Centre pour la Communication Scientifique Directe), Nov 29, 2011

L'objectif de ce travail est de valider l’aptitude d’un test non invasif ultrasonore à caract... more L'objectif de ce travail est de valider l’aptitude d’un test non invasif ultrasonore à caractériser la réhydratation (cinétique, mécanisme) de poudres de protéines laitières. Le test consiste à générer une onde ultrasonore et à observer sa transmission à travers la suspension solide/liquide agité

HAL (Le Centre pour la Communication Scientifique Directe), Jun 19, 2012

This study demonstrated the feasibility of applying an ultrasound test to evaluate the ability of... more This study demonstrated the feasibility of applying an ultrasound test to evaluate the ability of a powder to interact with a solvent and thus to predict the reconstitution behaviour of powders. The ultrasound attenuation was monitored and a corresponding relaxation time was calculated. Analysis of the ultrasound signal and images obtained by a granulomorphometer in the course of dispersion showed that the time required by the ultrasound attenuation parameter to relax is strongly associated with the time required by the solvent to penetrate primary particles. It was also shown that this step is of crucial importance in the dissolution mechanism as it precedes the fragmentation phase, identified as a limiting step. Classification of dairy powders according to their relaxation times (ultrasound test) and rehydration times (rehydration test, calculated with Static Light Scattering) was in good agreement for the range of milk powders investigated. Industrial relevance: Spray drying is commonly used to produce dairy powders in the food industry. Although the rehydration of these powders can be very slow, few analytic methods are available to evaluate the dissolvability of a dairy powder; consequently, there is a current lack of guidelines in order to tune spray dryer operating parameters for improving instant properties. The objective of this study is to present a new analytical method based on ultrasound test to evaluate powder ability to reconstitute. A probe was immerged in the liquid and the transmitted signal was analysed during the course of rehydration. The acoustic test was demonstrated to be effective in tracking solvent interactions, making it possible to assess the ability of a solvent to bind with the primary particle, and thus revealing it to be a powerful tool to evaluate the reconstitution ability of dairy powder quickly with low material costs. Of course the scope of this tool is broader than the sole food sector and encompasses all applications requiring a reconstitution step in a solvent.

Applied Physics Letters, Oct 16, 2017

This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic... more This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic waves for the realization of particle handling on-chip. The core structure of the microfluidic chip is made up of a confocal lens, a vertical reflection wall, and a ZnO film transducer coupled with a silicon substrate for exciting acoustic beams. The excited acoustic waves propagate in bulk silicon and are then guided by a 45 silicon mirror into the suspensions in the microchannel; afterwards, the acoustic energy is focused on particles by the confocal lens and reflected by a reflection wall. Parts of the reflected acoustic energy backtrack into the transducer, and acoustic attenuation measurements are characterized for particle detection. Meanwhile, a strong acoustic streaming phenomenon can be seen around the reflection wall, which is used to implement particle manipulation. This platform opens a frontier for on-chip integration of high sensitivity acoustic characterization and localized acoustic manipulation in microfluidics.

Review of Scientific Instruments, Jul 1, 2013

This paper reports the development of a new method of particle sizing in a liquid. This method us... more This paper reports the development of a new method of particle sizing in a liquid. This method uses high frequency focused ultrasounds to detect particles crossing the focal zone of an ultrasonic sensor and to determine their size distribution by processing the reflected echoes. The major advantage of this technique compared to optical sizing methods is its ability to measure the size of particles suspended in an opaque liquid without any dedicated sample preparation. Validations of ultrasonic measurements were achieved on suspensions of polymethyl methacrylate beads in a size range extending from a few micrometer to several hundred micrometer with a temporal resolution of 1 s. The inline detection of aggregate formation was also demonstrated.

HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2012

A set of predictive tools to diagnosis reconstitution and ageing behaviour of dairy powder

HAL (Le Centre pour la Communication Scientifique Directe), Dec 30, 2021

In this paper, a new model of piezoelectric cantilever is developed, it can be heavily used in a ... more In this paper, a new model of piezoelectric cantilever is developed, it can be heavily used in a micro electromechanical system (MEMS). This new prototype eliminates several risks caused by the previous means already used and increases the sensation in terms of rheology. Our approach is based on the approximation of the Eigen frequency shift when the micro-beam is totally immerged in an incompressible fluid. The density variation of the fluid is deduced and solved according to the behavior of the Eigen frequency. The material used for the manufacturing of the cantilever beam is Silicon Dioxide or Silica which is a porous material. Moreover, if the fluid contains particles, they can be adsorbed on the pores of the micro-beam and cause a change in the mass. Examination of theoretical computation by simulation approach was done using COMSOL Multiphysics software. The self-sensing micro-cantilever obtained in vacuum is around 390 Hz/ng measured at a center frequency of 960 kHz and with a density resolution of 0.055 % in fluid measured at a center frequency of 680 kHz. The used cantilever has the dimensions of (400 × 140 × 10) µm³.

Acta Scientific Women's Health

This paper proposes a new smart Bra concept to detect any potential strange lumps in women's brea... more This paper proposes a new smart Bra concept to detect any potential strange lumps in women's breasts by ultrasounds waves. These suspicious lumps can be a cyst, Abscess, Fibroadenoma, or Tumor. This system consists of 18 transducers positioned in a specific way, distributed on a ring, with a 5 MHz central frequency while respecting the anatomy of the breasts. We aim to minimize the main lobe's beamwidth (BW) and maximize the radiation field along the side lobes (SLL) of the transducer, with this wide lateral diffraction caused by the piezoelectric, we can detect any strange corps in the breast. Our hypothesis was confirmed by the correlation coefficient formula, where two signals are compared according to their spatial resemblance potentially. According to our findings, there are no suspicious lumps in the breast, while the correlation coefficient is as high as 0.2.

Applied Physics Letters, 2017

This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic... more This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic waves for the realization of particle handling on-chip. The core structure of the microfluidic chip is made up of a confocal lens, a vertical reflection wall, and a ZnO film transducer coupled with a silicon substrate for exciting acoustic beams. The excited acoustic waves propagate in bulk silicon and are then guided by a 45° silicon mirror into the suspensions in the microchannel; afterwards, the acoustic energy is focused on particles by the confocal lens and reflected by a reflection wall. Parts of the reflected acoustic energy backtrack into the transducer, and acoustic attenuation measurements are characterized for particle detection. Meanwhile, a strong acoustic streaming phenomenon can be seen around the reflection wall, which is used to implement particle manipulation. This platform opens a frontier for on-chip integration of high sensitivity acoustic characterization and local...

HAL (Le Centre pour la Communication Scientifique Directe), 2012

A set of predictive tools to diagnosis reconstitution and ageing behaviour of dairy powder

2017 Cosmetic Measurements And Testing (COSMETIC), 2017

In this work, a spherical device (1 cm in diameter) composed of two assembled hemispherical shell... more In this work, a spherical device (1 cm in diameter) composed of two assembled hemispherical shells integrating both the active element (piezoelectric ring) and the integrated electronics dedicated to coding, control and analysis was developed as an acoustic sensor. This autonomous sensor can operate simultaneously as a transmitter and a receiver around its fundamental frequency (32 kHz). Viewing these characteristics, operation within a sensor network could be envisaged and it will be possible to map the acoustic properties of a given medium characterized by a heterogeneous dispersion due to imposed dynamic motion.

Cellular and Molecular Bioengineering, 2021

Introduction-Since the outbreak began in January 2020, Covid-19 has affected more than 161 millio... more Introduction-Since the outbreak began in January 2020, Covid-19 has affected more than 161 million people worldwide and resulted in about 3.3 million deaths. Despite efforts to detect human infection with the virus as early as possible, the confirmatory test still requires the analysis of sputum or blood with estimated results available within approximately 30 minutes; this may potentially be followed by clinical referral if the patient shows signs of aggravated pneumonia. This work aims to implement a soft collar as a sound device dedicated to the objective evaluation of the pathophysiological state resulting from dysphonia of laryngeal origin or respiratory failure of inflammatory origin, in particular caused by Covid-19. Methods-In this study, we exploit the vibrations of waves generated by the vocal and respiratory system of 30 people. A biocompatible acoustic sensor embedded in a soft collar around the neck collects these waves. The collar is also equipped with thermal sensors and a cross-data analysis module in both the temporal and frequency domains (STFT). The optimal coupling conditions and the electrical and dimensional characteristics of the sensors were defined based on a mathematical approach using a matrix formalism. Results-The characteristics of the signals in the time domain combined with the quantities obtained from the STFT offer multidimensional information and a decision support tool for determining a pathophysiological state representative of the symptoms explored. The device, tested on 30 people, was able to differentiate patients with mild symptoms from those who had developed acute signs of respiratory failure on a severity scale of 1 to 10. Conclusion-With the health constraints imposed by the effects of Covid-19, the heavy organization to be implemented resulting from the flow of diagnostics, tests and clinical management, it was urgent to develop innovative and safe biomedical technologies. This passive listening technique will contribute to the non-invasive assessment and dynamic observation of lesions. Moreover, it merits further examination to provide support for medical operators to improve clinical management.

Journal of Cancer Science and Clinical Therapeutics, 2019

An ultrasound breast imaging system was implemented comprising sensors with a wide lateral radiat... more An ultrasound breast imaging system was implemented comprising sensors with a wide lateral radiation field distributed at equal distances on rings of different diameters covering the breast. The Green function was derived to calculate the acoustic field generated by these transducers when they were excited sequentially by a short radio frequency pulsation with a central frequency of 4.5 MHz. The temporal convolution function was used to define the maximum spatial resemblance between two signals. This made it possible to quantify the ultrasonic intensity for all the spatial positions in a single step through the principle of phantoms coupled to the signal envelope from each point considered as a potentially suspicious area. The results show the relevance of the system under consideration.

WSEAS TRANSACTIONS ON COMMUNICATIONS, 2020

This work tackles a combination of two technological fields: "integrated ultrasonic biosenso... more This work tackles a combination of two technological fields: "integrated ultrasonic biosensors" and "connected modules" coupled with “Artificial Intelligence” algorithms to provide healthcare professionals with additional indices offering multidimensional information and a “Decision Support” tool. This device comprises a connected telemedical platform (PC or Smartphone) dedicated to the objective and remote assessment of pathophysiological states resulting from dysphonia of laryngeal origin or respiratory failure of inflammatory origin.

Review of Scientific Instruments, 2020

Nowadays, surveillance systems have evolved significantly; hence, in order to meet the specific n... more Nowadays, surveillance systems have evolved significantly; hence, in order to meet the specific needs of the health sector and to monitor the patients’ health conditions, intelligent systems have been proposed. These innovations represent a primordial role in road safety, which reduce the risk of traffic accidents. This paper describes an intelligent system design for remote monitoring (tele-monitoring) of a driver’s health condition in real time. The measurement using new hardware and software devices is made possible through the contact between the driver contact and an intelligent steering wheel, which is coupled either to an integrated monitor or to a bluetooth link with a local Android smartphone. The driver’s heart rate is calculated through the continuous collection of the electrocardiographic signal as well as the blood oxygen saturation SpO2 by using the photoplethysmographic technique. Consequently, it is necessary to monitor the two vital functions of the driver, cardiac ...

WSEAS TRANSACTIONS ON BIOLOGY AND BIOMEDICINE, 2020

In this paper, we investigate the behaviour of biological tissues (skin) coupled to a flexible se... more In this paper, we investigate the behaviour of biological tissues (skin) coupled to a flexible sensor embedded at a solid substrate based on a numerical model taking into account the relationship between strain/stress components at the interface. Based on this study, the most appropriate biomechanical factors are understood and quantified in order to optimize the sensor/biological tissue interface conditions. A micromechanical description based on a mathematical formulation has been developed to evaluate the biomechanical behaviour provided by a 2D viscoelastic model of Kelvin-Voigt. Based on the results, it appears that the model can be used effectively to characterize in-vivo the dynamic properties of soft tissues in order to adapt the biophysical properties of flexible sensors dedicated to optimal adhesion

Review of Scientific Instruments, 2020

This work addresses the study and design of a diagnostic device consisting of a thin-film sensor ... more This work addresses the study and design of a diagnostic device consisting of a thin-film sensor array based on 8-mm concentered rings, acting as an autonomous acoustic sensor covering a wide range of resonance frequencies (0.1 KHz–2 MHz). In addition to its advantageous shape, this device integrates both the active vibratory element and the embedded electronics dedicated to coding, control, and analysis. The results show that the experimental device could be the basis of a telemedical platform for the objective assessment and monitoring of chronic laryngeal dysphonia through the spectro-temporal analysis of the vibration of the vocal cords. Furthermore, this non-invasive, non-intrusive protocol does not require the physical cooperation of the patient.

Urologicheskie vedomosti, 2020

Renal echinococcosis is a relatively rare disease. Making a preoperative clinical, biological and... more Renal echinococcosis is a relatively rare disease. Making a preoperative clinical, biological and radiological diagnosis is quite challenging and hard. A clinical case of a 63-year-old patient operated on for renal echinococcosis is presented. The formation had the form of multiple grape-like cysts were mistaken for a cystic tumor of the kidney before surgery.

MATEC Web of Conferences, 2018

In this work an analytical model for the energy harvesting of an acoustic spherical sensor has be... more In this work an analytical model for the energy harvesting of an acoustic spherical sensor has been developed in the context to make it autonomous. Our spherical sensor is composed of two half-spheres of Plexiglas and a piezoelectric ring of PZ26 that can be used as exciter or sensor. For the analytical model, the piezoelectric ring was modeled using two primary modes of vibration: thickness and radial. For each mode, the ring is described by an equivalent electromechanical model which connects the mechanical part (forces and velocities) to the electrical part (voltage and current). The proposed paper theoretical model enables building a global electromechanical circuit in order to simulate the total harvested voltage response.

Urology Case Reports, 2019

Renal Echinococcosis is a rare medical entity (2-4%). The preoperative clinical, biological and r... more Renal Echinococcosis is a rare medical entity (2-4%). The preoperative clinical, biological and radiological diagnosis is quite challenging. We report herein the case of a 63 year-old female patient, operated for a suspicious renal cystic mass that resulted full of grape-like cysts intraoperatively.

HAL (Le Centre pour la Communication Scientifique Directe), Nov 29, 2011

L'objectif de ce travail est de valider l’aptitude d’un test non invasif ultrasonore à caract... more L'objectif de ce travail est de valider l’aptitude d’un test non invasif ultrasonore à caractériser la réhydratation (cinétique, mécanisme) de poudres de protéines laitières. Le test consiste à générer une onde ultrasonore et à observer sa transmission à travers la suspension solide/liquide agité

HAL (Le Centre pour la Communication Scientifique Directe), Jun 19, 2012

This study demonstrated the feasibility of applying an ultrasound test to evaluate the ability of... more This study demonstrated the feasibility of applying an ultrasound test to evaluate the ability of a powder to interact with a solvent and thus to predict the reconstitution behaviour of powders. The ultrasound attenuation was monitored and a corresponding relaxation time was calculated. Analysis of the ultrasound signal and images obtained by a granulomorphometer in the course of dispersion showed that the time required by the ultrasound attenuation parameter to relax is strongly associated with the time required by the solvent to penetrate primary particles. It was also shown that this step is of crucial importance in the dissolution mechanism as it precedes the fragmentation phase, identified as a limiting step. Classification of dairy powders according to their relaxation times (ultrasound test) and rehydration times (rehydration test, calculated with Static Light Scattering) was in good agreement for the range of milk powders investigated. Industrial relevance: Spray drying is commonly used to produce dairy powders in the food industry. Although the rehydration of these powders can be very slow, few analytic methods are available to evaluate the dissolvability of a dairy powder; consequently, there is a current lack of guidelines in order to tune spray dryer operating parameters for improving instant properties. The objective of this study is to present a new analytical method based on ultrasound test to evaluate powder ability to reconstitute. A probe was immerged in the liquid and the transmitted signal was analysed during the course of rehydration. The acoustic test was demonstrated to be effective in tracking solvent interactions, making it possible to assess the ability of a solvent to bind with the primary particle, and thus revealing it to be a powerful tool to evaluate the reconstitution ability of dairy powder quickly with low material costs. Of course the scope of this tool is broader than the sole food sector and encompasses all applications requiring a reconstitution step in a solvent.

Applied Physics Letters, Oct 16, 2017

This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic... more This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic waves for the realization of particle handling on-chip. The core structure of the microfluidic chip is made up of a confocal lens, a vertical reflection wall, and a ZnO film transducer coupled with a silicon substrate for exciting acoustic beams. The excited acoustic waves propagate in bulk silicon and are then guided by a 45 silicon mirror into the suspensions in the microchannel; afterwards, the acoustic energy is focused on particles by the confocal lens and reflected by a reflection wall. Parts of the reflected acoustic energy backtrack into the transducer, and acoustic attenuation measurements are characterized for particle detection. Meanwhile, a strong acoustic streaming phenomenon can be seen around the reflection wall, which is used to implement particle manipulation. This platform opens a frontier for on-chip integration of high sensitivity acoustic characterization and localized acoustic manipulation in microfluidics.

Review of Scientific Instruments, Jul 1, 2013

This paper reports the development of a new method of particle sizing in a liquid. This method us... more This paper reports the development of a new method of particle sizing in a liquid. This method uses high frequency focused ultrasounds to detect particles crossing the focal zone of an ultrasonic sensor and to determine their size distribution by processing the reflected echoes. The major advantage of this technique compared to optical sizing methods is its ability to measure the size of particles suspended in an opaque liquid without any dedicated sample preparation. Validations of ultrasonic measurements were achieved on suspensions of polymethyl methacrylate beads in a size range extending from a few micrometer to several hundred micrometer with a temporal resolution of 1 s. The inline detection of aggregate formation was also demonstrated.

HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2012

A set of predictive tools to diagnosis reconstitution and ageing behaviour of dairy powder

HAL (Le Centre pour la Communication Scientifique Directe), Dec 30, 2021

In this paper, a new model of piezoelectric cantilever is developed, it can be heavily used in a ... more In this paper, a new model of piezoelectric cantilever is developed, it can be heavily used in a micro electromechanical system (MEMS). This new prototype eliminates several risks caused by the previous means already used and increases the sensation in terms of rheology. Our approach is based on the approximation of the Eigen frequency shift when the micro-beam is totally immerged in an incompressible fluid. The density variation of the fluid is deduced and solved according to the behavior of the Eigen frequency. The material used for the manufacturing of the cantilever beam is Silicon Dioxide or Silica which is a porous material. Moreover, if the fluid contains particles, they can be adsorbed on the pores of the micro-beam and cause a change in the mass. Examination of theoretical computation by simulation approach was done using COMSOL Multiphysics software. The self-sensing micro-cantilever obtained in vacuum is around 390 Hz/ng measured at a center frequency of 960 kHz and with a density resolution of 0.055 % in fluid measured at a center frequency of 680 kHz. The used cantilever has the dimensions of (400 × 140 × 10) µm³.

Acta Scientific Women's Health

This paper proposes a new smart Bra concept to detect any potential strange lumps in women's brea... more This paper proposes a new smart Bra concept to detect any potential strange lumps in women's breasts by ultrasounds waves. These suspicious lumps can be a cyst, Abscess, Fibroadenoma, or Tumor. This system consists of 18 transducers positioned in a specific way, distributed on a ring, with a 5 MHz central frequency while respecting the anatomy of the breasts. We aim to minimize the main lobe's beamwidth (BW) and maximize the radiation field along the side lobes (SLL) of the transducer, with this wide lateral diffraction caused by the piezoelectric, we can detect any strange corps in the breast. Our hypothesis was confirmed by the correlation coefficient formula, where two signals are compared according to their spatial resemblance potentially. According to our findings, there are no suspicious lumps in the breast, while the correlation coefficient is as high as 0.2.

Applied Physics Letters, 2017

This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic... more This letter presents a microfluidic device that integrates high frequency (650 MHz) bulk acoustic waves for the realization of particle handling on-chip. The core structure of the microfluidic chip is made up of a confocal lens, a vertical reflection wall, and a ZnO film transducer coupled with a silicon substrate for exciting acoustic beams. The excited acoustic waves propagate in bulk silicon and are then guided by a 45° silicon mirror into the suspensions in the microchannel; afterwards, the acoustic energy is focused on particles by the confocal lens and reflected by a reflection wall. Parts of the reflected acoustic energy backtrack into the transducer, and acoustic attenuation measurements are characterized for particle detection. Meanwhile, a strong acoustic streaming phenomenon can be seen around the reflection wall, which is used to implement particle manipulation. This platform opens a frontier for on-chip integration of high sensitivity acoustic characterization and local...

HAL (Le Centre pour la Communication Scientifique Directe), 2012

A set of predictive tools to diagnosis reconstitution and ageing behaviour of dairy powder

2017 Cosmetic Measurements And Testing (COSMETIC), 2017

In this work, a spherical device (1 cm in diameter) composed of two assembled hemispherical shell... more In this work, a spherical device (1 cm in diameter) composed of two assembled hemispherical shells integrating both the active element (piezoelectric ring) and the integrated electronics dedicated to coding, control and analysis was developed as an acoustic sensor. This autonomous sensor can operate simultaneously as a transmitter and a receiver around its fundamental frequency (32 kHz). Viewing these characteristics, operation within a sensor network could be envisaged and it will be possible to map the acoustic properties of a given medium characterized by a heterogeneous dispersion due to imposed dynamic motion.

Cellular and Molecular Bioengineering, 2021

Introduction-Since the outbreak began in January 2020, Covid-19 has affected more than 161 millio... more Introduction-Since the outbreak began in January 2020, Covid-19 has affected more than 161 million people worldwide and resulted in about 3.3 million deaths. Despite efforts to detect human infection with the virus as early as possible, the confirmatory test still requires the analysis of sputum or blood with estimated results available within approximately 30 minutes; this may potentially be followed by clinical referral if the patient shows signs of aggravated pneumonia. This work aims to implement a soft collar as a sound device dedicated to the objective evaluation of the pathophysiological state resulting from dysphonia of laryngeal origin or respiratory failure of inflammatory origin, in particular caused by Covid-19. Methods-In this study, we exploit the vibrations of waves generated by the vocal and respiratory system of 30 people. A biocompatible acoustic sensor embedded in a soft collar around the neck collects these waves. The collar is also equipped with thermal sensors and a cross-data analysis module in both the temporal and frequency domains (STFT). The optimal coupling conditions and the electrical and dimensional characteristics of the sensors were defined based on a mathematical approach using a matrix formalism. Results-The characteristics of the signals in the time domain combined with the quantities obtained from the STFT offer multidimensional information and a decision support tool for determining a pathophysiological state representative of the symptoms explored. The device, tested on 30 people, was able to differentiate patients with mild symptoms from those who had developed acute signs of respiratory failure on a severity scale of 1 to 10. Conclusion-With the health constraints imposed by the effects of Covid-19, the heavy organization to be implemented resulting from the flow of diagnostics, tests and clinical management, it was urgent to develop innovative and safe biomedical technologies. This passive listening technique will contribute to the non-invasive assessment and dynamic observation of lesions. Moreover, it merits further examination to provide support for medical operators to improve clinical management.

Journal of Cancer Science and Clinical Therapeutics, 2019

An ultrasound breast imaging system was implemented comprising sensors with a wide lateral radiat... more An ultrasound breast imaging system was implemented comprising sensors with a wide lateral radiation field distributed at equal distances on rings of different diameters covering the breast. The Green function was derived to calculate the acoustic field generated by these transducers when they were excited sequentially by a short radio frequency pulsation with a central frequency of 4.5 MHz. The temporal convolution function was used to define the maximum spatial resemblance between two signals. This made it possible to quantify the ultrasonic intensity for all the spatial positions in a single step through the principle of phantoms coupled to the signal envelope from each point considered as a potentially suspicious area. The results show the relevance of the system under consideration.

WSEAS TRANSACTIONS ON COMMUNICATIONS, 2020

This work tackles a combination of two technological fields: "integrated ultrasonic biosenso... more This work tackles a combination of two technological fields: "integrated ultrasonic biosensors" and "connected modules" coupled with “Artificial Intelligence” algorithms to provide healthcare professionals with additional indices offering multidimensional information and a “Decision Support” tool. This device comprises a connected telemedical platform (PC or Smartphone) dedicated to the objective and remote assessment of pathophysiological states resulting from dysphonia of laryngeal origin or respiratory failure of inflammatory origin.

Review of Scientific Instruments, 2020

Nowadays, surveillance systems have evolved significantly; hence, in order to meet the specific n... more Nowadays, surveillance systems have evolved significantly; hence, in order to meet the specific needs of the health sector and to monitor the patients’ health conditions, intelligent systems have been proposed. These innovations represent a primordial role in road safety, which reduce the risk of traffic accidents. This paper describes an intelligent system design for remote monitoring (tele-monitoring) of a driver’s health condition in real time. The measurement using new hardware and software devices is made possible through the contact between the driver contact and an intelligent steering wheel, which is coupled either to an integrated monitor or to a bluetooth link with a local Android smartphone. The driver’s heart rate is calculated through the continuous collection of the electrocardiographic signal as well as the blood oxygen saturation SpO2 by using the photoplethysmographic technique. Consequently, it is necessary to monitor the two vital functions of the driver, cardiac ...

WSEAS TRANSACTIONS ON BIOLOGY AND BIOMEDICINE, 2020

In this paper, we investigate the behaviour of biological tissues (skin) coupled to a flexible se... more In this paper, we investigate the behaviour of biological tissues (skin) coupled to a flexible sensor embedded at a solid substrate based on a numerical model taking into account the relationship between strain/stress components at the interface. Based on this study, the most appropriate biomechanical factors are understood and quantified in order to optimize the sensor/biological tissue interface conditions. A micromechanical description based on a mathematical formulation has been developed to evaluate the biomechanical behaviour provided by a 2D viscoelastic model of Kelvin-Voigt. Based on the results, it appears that the model can be used effectively to characterize in-vivo the dynamic properties of soft tissues in order to adapt the biophysical properties of flexible sensors dedicated to optimal adhesion

Review of Scientific Instruments, 2020

This work addresses the study and design of a diagnostic device consisting of a thin-film sensor ... more This work addresses the study and design of a diagnostic device consisting of a thin-film sensor array based on 8-mm concentered rings, acting as an autonomous acoustic sensor covering a wide range of resonance frequencies (0.1 KHz–2 MHz). In addition to its advantageous shape, this device integrates both the active vibratory element and the embedded electronics dedicated to coding, control, and analysis. The results show that the experimental device could be the basis of a telemedical platform for the objective assessment and monitoring of chronic laryngeal dysphonia through the spectro-temporal analysis of the vibration of the vocal cords. Furthermore, this non-invasive, non-intrusive protocol does not require the physical cooperation of the patient.

Urologicheskie vedomosti, 2020

Renal echinococcosis is a relatively rare disease. Making a preoperative clinical, biological and... more Renal echinococcosis is a relatively rare disease. Making a preoperative clinical, biological and radiological diagnosis is quite challenging and hard. A clinical case of a 63-year-old patient operated on for renal echinococcosis is presented. The formation had the form of multiple grape-like cysts were mistaken for a cystic tumor of the kidney before surgery.

MATEC Web of Conferences, 2018

In this work an analytical model for the energy harvesting of an acoustic spherical sensor has be... more In this work an analytical model for the energy harvesting of an acoustic spherical sensor has been developed in the context to make it autonomous. Our spherical sensor is composed of two half-spheres of Plexiglas and a piezoelectric ring of PZ26 that can be used as exciter or sensor. For the analytical model, the piezoelectric ring was modeled using two primary modes of vibration: thickness and radial. For each mode, the ring is described by an equivalent electromechanical model which connects the mechanical part (forces and velocities) to the electrical part (voltage and current). The proposed paper theoretical model enables building a global electromechanical circuit in order to simulate the total harvested voltage response.

Urology Case Reports, 2019

Renal Echinococcosis is a rare medical entity (2-4%). The preoperative clinical, biological and r... more Renal Echinococcosis is a rare medical entity (2-4%). The preoperative clinical, biological and radiological diagnosis is quite challenging. We report herein the case of a 63 year-old female patient, operated for a suspicious renal cystic mass that resulted full of grape-like cysts intraoperatively.