Abdou Bouzid - Academia.edu (original) (raw)

Papers by Abdou Bouzid

Physica Status Solidi B-basic Solid State Physics, Jun 1, 1999

The effect of surface and bulk transverse fields on the phase transitions of a semi-infinite spin... more The effect of surface and bulk transverse fields on the phase transitions of a semi-infinite spin-1 ferromagnetic Ising model is investigated within a finite cluster approximation with an expansion technique for cluster identities of spin-1 localized spin systems. The phase diagrams are determined as a function of the ratio of bulk and surface transverse fields, the temperature and the transverse field of the surface. They show that the systems exhibit a variety of phase transitions. A dead layer is also obtained in a special region of space parameters.

A new method which can recognize rotated patterns by use a ring detector is discussed. It show th... more A new method which can recognize rotated patterns by use a ring detector is discussed. It show that the phase only of the Fourier transform of input pattern is more effective and efficient for evaluation and discrimination of rotated target. A correlation coefficient between different pattern orientations is presented and an application of these transforms in optical pattern recognition is described.

Optics Express, Jul 24, 2023

Despite the steady advancements in nanofabrication made over the past decade that had prompted a ... more Despite the steady advancements in nanofabrication made over the past decade that had prompted a plethora of intriguing applications across various fields, achieving compatibility between miniaturized photonic devices and electronic dimensions remains unachievable due to the inherent diffraction limit of photonic devices. Herein, we present an approach based on anisotropic scaling of the shapes of photonic crystals (PhCs) to overcome the diffraction limit and achieve controlled diffraction limit along the ΓX direction. Thus, we demonstrate that scaling the direction perpendicular to the wave’s propagation (y-direction) by 1/2 and 1/4 significantly improves the diffraction limit by two and four orders of magnitude, respectively. This approach opens up possibilities for high-frequency wave guiding in a cermet configuration, which was previously unachievable. Furthermore, we illustrate the existence of a quasi-bound state in the continuum (QBICs) in asymmetric dimer network-type photonic crystals (PhCs).

Journal of Emerging Trends in Engineering and Applied Sciences, Aug 1, 2013

The magnetic resonators commonly called SRR are structures that exhibit a high frequency magnetic... more The magnetic resonators commonly called SRR are structures that exhibit a high frequency magnetic activity where natural magnetism disappears completely. Theses resonant structures with a frequency range where the permeability is negative when inserted into a metal rods network that has a frequency range where the permittivity is negative give rise to some particular physical phenomena such as the inversion of the Doppler and Cerenkov effects, and also a medium with negative refraction index, the problem that often occurs is the overlapping frequency ranges, which is not always obvious. In this work, we will present a new shape of SRR that have an artificial magnetism behavior. We will show numerically in a parametric study one of the techniques which provide us the possibility to control the frequency response and hence to tune the negative bandwidth to meet need of the overlapping ranges. The losses by absorption are investigated. The effective parameters are calculated using the transfer matrix and Fresnel coefficients method.

In this paper, an autonomous active contour model based on the optical correlation algorithm is p... more In this paper, an autonomous active contour model based on the optical correlation algorithm is proposed. Optical correlation is used to calculate iris and pupil areas with a digital simulation of the Vander Lugt correlator. This area term computation assists the model to define an initial contour and at a later stage, to calculate terms in the energy expression. In the proposed model, several reference images called filters of iris and pupil have been introduced. Applied to three iris database and iris motion video, the proposed model enables us to reach better segmentation and tracking accuracy performance of irises.

Physica Medica, Apr 1, 2018

Iris neoplasm is a non-symptom cancer that causes a gradual loss of sight. The first purpose of t... more Iris neoplasm is a non-symptom cancer that causes a gradual loss of sight. The first purpose of this study was to present a novel and automatic method for segmenting the iris tumors and detecting the corresponding areas changing along time. The second aim of this work was to investigate several recently published methods after being applied for the iris tumors segmentation. Methods: Our approach consists firstly in segmenting the iris region by using the Vander Lugt correlator based active contour method. Secondly, by treating only the iris region, a K-means clustering model was used to assign the tumorous tissue to one pixel-cluster. This model is quite sensitive to the center initialization and to the choice of the distance measure. To solve these problems, a proportional probability based approach was introduced for the cluster center initialization, and the impact of several distance measure was investigated. The proposed method and the different comparative methods were evaluated on two databases: the Eye Cancer and the Miles Research. Results: Results reported using several performance metrics reveal that the first step assures the detection of all iris tumors with an accuracy of 100%. Additionally, the proposed method yields better performance compared to the recently published methods.

Expert Systems With Applications, Apr 1, 2017

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights • Fast an accurate iris segmentation system is presented. • The Optical Correlation based Active Contour (OCAC) technique is described. • A general study of the OCAC for iris segmentation and tracking is presented. • Small computation time achieved by the algorithm is the advantage of the used method. • The presented intelligent system perform a high accuracy in iris segmentation.

arXiv (Cornell University), Apr 9, 2023

Nanomaterials, Jan 17, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

The Journal of Supercomputing, Jun 17, 2023

IEEE Conference Proceedings, 2016

Analyse theorique des proprietes des reseaux de phase, conditions d'etude et de realisation d... more Analyse theorique des proprietes des reseaux de phase, conditions d'etude et de realisation des element optiques holographiques pour un certain nombre d'applications. Evaluation du materiau photosensible permettant d'atteindre des efficacites de diffraction tres proches de 100 %. Mise au point d'une methode de suivi de l'evolution du materiau durant le processus de fabrication des composants. Nous pouvons determiner separement les valeurs des indices de refraction et des epaisseurs par interferometrie mach-zehnder

International Journal of Mechanical Sciences, Sep 1, 2023

Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizin... more Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizing mechanical properties that do not exist in ordinary solids. Among these, twisting metamaterials and acoustical chirality are sample-size dependent. The purpose of this work is, first, to examine the mechanical performance of a new twisting cubic metamaterial. Then, we perform a comparative investigation of its twisting behavior using the finite element method on microstructure elements computation, a phenomenological model, and we compare them to Eringen micropolar continuum. Notably, the results of the three models are in good qualitative and quantitative agreements. Finally, a systematic comparison of dispersion relations was made for the continuum and for the microstructures with different sizes in unit cells as final proof of perfect mapping.

Journal of Magnetism and Magnetic Materials, Dec 1, 1999

The effect of the surface and bulk transverse fields on the phase diagrams of a semi-infinite spi... more The effect of the surface and bulk transverse fields on the phase diagrams of a semi-infinite spin-1 ferromagnetic Ising model with a crystal field is investigated within a finite cluster approximation with an expansion technique for cluster identities of spin-1 localized spin systems. Phase diagrams are determined as a function of the ratio of bulk and surface transverse fields and

2020 1st International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET)

The absorption of electromagnetic radiation by gold nanoparticles at the nanometer scale is of pr... more The absorption of electromagnetic radiation by gold nanoparticles at the nanometer scale is of prime importance in several applications owing to the strong plasmon field at the surface. Further, the electron-phonon and phonon-phonon interactions converting the absorbed radiation into heat is vital for cancer cell imaging and photothermal therapy. In the present study, we report on a numerical investigation of gold nanorods bathing in a tumorous tissue. Moreover, emphasis is put on a numerical simulation of the plasmonic response of the gold nanorods and the effect of geometric parameters variation. The computations are done using a theoretical model where the Maxwell’s equations are solved in the frequency domain using the finite element method. The evaluation of the change in the frequency at maximum absorption as a function of geometric parameters is discussed. These results should guide design of optimized optical contrast agents for molecular imaging.

SSRN Electronic Journal

Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizin... more Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizing mechanical properties that do not exist in ordinary solids. Among these, twisting metamaterials and acoustical chirality are sample-size dependent. The purpose of this work is, first, to examine the mechanical performance of a new twisting cubic metamaterial. Then, we perform a comparative investigation of its twisting behavior using the finite element method on microstructure elements computation, a phenomenological model, and we compare them to Eringen micropolar continuum. Notably, the results of the three models are in good qualitative and quantitative agreements. Finally, a systematic comparison of dispersion relations was made for the continuum and for the microstructures with different sizes in unit cells as final proof of perfect mapping.

2020 1st International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET)

Tumor segmentation from magnetic resonance images (MRI) is an error-prone and time-absorbing proc... more Tumor segmentation from magnetic resonance images (MRI) is an error-prone and time-absorbing process. In this paper, we propose a novel architecture adapting the Optical Scanning Holography (OSH) to the detection of tumors regions in MRI. The proposed method combines an off-axis optical scan, performed by a heterodyne fringe pattern, and a MR image display ensured by a spatial light modulator. The output quadrature component of the scanned current is collected digitally. Hence, a high-precision distribution of biological tissues is extracted. Its maximum position is exactly the one of the tumor. Meanwhile, this position is used in an Active Contour Model (ACM) to perform a fast segmentation of the extent corresponding to the tumors. Several images of brain tumors from BRATS database, with tumors having different contrast and form, are used to test the proposed system. Parameters reverted by the optical process are used to investigate the detection performance. Further, in terms of tumor segmentation, the proposed OSH-ACM process has high performance metrics compared to some of recently published method. The underlying physics of the precision superiority, presented by the OSH-ACM, is the high-precision extraction of the abnormal tissue regions by the quadrature component of the scanned current.

Innovations in Smart Cities Applications Volume 5, 2022

We present in this paper a new method of matching by the adaptive correlation, dedicated to Radar... more We present in this paper a new method of matching by the adaptive correlation, dedicated to Radar applications with stereoscopic vision. This work is related to the detection and calculation of the object depth in the Radar images. This system has the advantage to be invisible and it allows the measurement of the radial distance or the depth of each object separately even at low-altitude. The most classical area-based Methods used in this domain are the cross correlation with a fixed window-size. However, objects presented herein have some variable forms (planes with different sizes and depths). These methods cannot provide a depth directly and separately for every object. The aim of this paper is to present a new algorithm in matching, based on the correlation with chains, that holds account of the object form. The using of the improved chaining method allows the following: Working on a linear description under form of a chained contour list. Possibility of an extended storage for ...

Owing to the rapid of the communication and multimedia technology, documents are distributed thro... more Owing to the rapid of the communication and multimedia technology, documents are distributed through the internet simpler than before, but at the same time, these Advantages can also be used by pirates. The concept of digital watermarking is associated with datahiding technique known Steganography. This mechanism of leading insertion should respect two conditions at least: mark must be indiscernible; the human eye should not differentiate between a not marked and marked image; the watermark should resist any voluntary or involuntary changes. Extraction should be also blind: to extract mark they don’t need original picture. Many watermarking algorithms in the field DCT, wavelet and CDMA have been proposed seeking to optimize a compromise imperceptibility / robustness. Many recent techniques of watermarking are inspired by usual methods of coding and compression. The singular value decomposition (SVD) is one example. In this paper, we present the most recent method of SVD algorithm ap...

Physica Status Solidi B-basic Solid State Physics, Jun 1, 1999

The effect of surface and bulk transverse fields on the phase transitions of a semi-infinite spin... more The effect of surface and bulk transverse fields on the phase transitions of a semi-infinite spin-1 ferromagnetic Ising model is investigated within a finite cluster approximation with an expansion technique for cluster identities of spin-1 localized spin systems. The phase diagrams are determined as a function of the ratio of bulk and surface transverse fields, the temperature and the transverse field of the surface. They show that the systems exhibit a variety of phase transitions. A dead layer is also obtained in a special region of space parameters.

A new method which can recognize rotated patterns by use a ring detector is discussed. It show th... more A new method which can recognize rotated patterns by use a ring detector is discussed. It show that the phase only of the Fourier transform of input pattern is more effective and efficient for evaluation and discrimination of rotated target. A correlation coefficient between different pattern orientations is presented and an application of these transforms in optical pattern recognition is described.

Optics Express, Jul 24, 2023

Despite the steady advancements in nanofabrication made over the past decade that had prompted a ... more Despite the steady advancements in nanofabrication made over the past decade that had prompted a plethora of intriguing applications across various fields, achieving compatibility between miniaturized photonic devices and electronic dimensions remains unachievable due to the inherent diffraction limit of photonic devices. Herein, we present an approach based on anisotropic scaling of the shapes of photonic crystals (PhCs) to overcome the diffraction limit and achieve controlled diffraction limit along the ΓX direction. Thus, we demonstrate that scaling the direction perpendicular to the wave’s propagation (y-direction) by 1/2 and 1/4 significantly improves the diffraction limit by two and four orders of magnitude, respectively. This approach opens up possibilities for high-frequency wave guiding in a cermet configuration, which was previously unachievable. Furthermore, we illustrate the existence of a quasi-bound state in the continuum (QBICs) in asymmetric dimer network-type photonic crystals (PhCs).

Journal of Emerging Trends in Engineering and Applied Sciences, Aug 1, 2013

The magnetic resonators commonly called SRR are structures that exhibit a high frequency magnetic... more The magnetic resonators commonly called SRR are structures that exhibit a high frequency magnetic activity where natural magnetism disappears completely. Theses resonant structures with a frequency range where the permeability is negative when inserted into a metal rods network that has a frequency range where the permittivity is negative give rise to some particular physical phenomena such as the inversion of the Doppler and Cerenkov effects, and also a medium with negative refraction index, the problem that often occurs is the overlapping frequency ranges, which is not always obvious. In this work, we will present a new shape of SRR that have an artificial magnetism behavior. We will show numerically in a parametric study one of the techniques which provide us the possibility to control the frequency response and hence to tune the negative bandwidth to meet need of the overlapping ranges. The losses by absorption are investigated. The effective parameters are calculated using the transfer matrix and Fresnel coefficients method.

In this paper, an autonomous active contour model based on the optical correlation algorithm is p... more In this paper, an autonomous active contour model based on the optical correlation algorithm is proposed. Optical correlation is used to calculate iris and pupil areas with a digital simulation of the Vander Lugt correlator. This area term computation assists the model to define an initial contour and at a later stage, to calculate terms in the energy expression. In the proposed model, several reference images called filters of iris and pupil have been introduced. Applied to three iris database and iris motion video, the proposed model enables us to reach better segmentation and tracking accuracy performance of irises.

Physica Medica, Apr 1, 2018

Iris neoplasm is a non-symptom cancer that causes a gradual loss of sight. The first purpose of t... more Iris neoplasm is a non-symptom cancer that causes a gradual loss of sight. The first purpose of this study was to present a novel and automatic method for segmenting the iris tumors and detecting the corresponding areas changing along time. The second aim of this work was to investigate several recently published methods after being applied for the iris tumors segmentation. Methods: Our approach consists firstly in segmenting the iris region by using the Vander Lugt correlator based active contour method. Secondly, by treating only the iris region, a K-means clustering model was used to assign the tumorous tissue to one pixel-cluster. This model is quite sensitive to the center initialization and to the choice of the distance measure. To solve these problems, a proportional probability based approach was introduced for the cluster center initialization, and the impact of several distance measure was investigated. The proposed method and the different comparative methods were evaluated on two databases: the Eye Cancer and the Miles Research. Results: Results reported using several performance metrics reveal that the first step assures the detection of all iris tumors with an accuracy of 100%. Additionally, the proposed method yields better performance compared to the recently published methods.

Expert Systems With Applications, Apr 1, 2017

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights • Fast an accurate iris segmentation system is presented. • The Optical Correlation based Active Contour (OCAC) technique is described. • A general study of the OCAC for iris segmentation and tracking is presented. • Small computation time achieved by the algorithm is the advantage of the used method. • The presented intelligent system perform a high accuracy in iris segmentation.

arXiv (Cornell University), Apr 9, 2023

Nanomaterials, Jan 17, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

The Journal of Supercomputing, Jun 17, 2023

IEEE Conference Proceedings, 2016

Analyse theorique des proprietes des reseaux de phase, conditions d'etude et de realisation d... more Analyse theorique des proprietes des reseaux de phase, conditions d'etude et de realisation des element optiques holographiques pour un certain nombre d'applications. Evaluation du materiau photosensible permettant d'atteindre des efficacites de diffraction tres proches de 100 %. Mise au point d'une methode de suivi de l'evolution du materiau durant le processus de fabrication des composants. Nous pouvons determiner separement les valeurs des indices de refraction et des epaisseurs par interferometrie mach-zehnder

International Journal of Mechanical Sciences, Sep 1, 2023

Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizin... more Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizing mechanical properties that do not exist in ordinary solids. Among these, twisting metamaterials and acoustical chirality are sample-size dependent. The purpose of this work is, first, to examine the mechanical performance of a new twisting cubic metamaterial. Then, we perform a comparative investigation of its twisting behavior using the finite element method on microstructure elements computation, a phenomenological model, and we compare them to Eringen micropolar continuum. Notably, the results of the three models are in good qualitative and quantitative agreements. Finally, a systematic comparison of dispersion relations was made for the continuum and for the microstructures with different sizes in unit cells as final proof of perfect mapping.

Journal of Magnetism and Magnetic Materials, Dec 1, 1999

The effect of the surface and bulk transverse fields on the phase diagrams of a semi-infinite spi... more The effect of the surface and bulk transverse fields on the phase diagrams of a semi-infinite spin-1 ferromagnetic Ising model with a crystal field is investigated within a finite cluster approximation with an expansion technique for cluster identities of spin-1 localized spin systems. Phase diagrams are determined as a function of the ratio of bulk and surface transverse fields and

2020 1st International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET)

The absorption of electromagnetic radiation by gold nanoparticles at the nanometer scale is of pr... more The absorption of electromagnetic radiation by gold nanoparticles at the nanometer scale is of prime importance in several applications owing to the strong plasmon field at the surface. Further, the electron-phonon and phonon-phonon interactions converting the absorbed radiation into heat is vital for cancer cell imaging and photothermal therapy. In the present study, we report on a numerical investigation of gold nanorods bathing in a tumorous tissue. Moreover, emphasis is put on a numerical simulation of the plasmonic response of the gold nanorods and the effect of geometric parameters variation. The computations are done using a theoretical model where the Maxwell’s equations are solved in the frequency domain using the finite element method. The evaluation of the change in the frequency at maximum absorption as a function of geometric parameters is discussed. These results should guide design of optimized optical contrast agents for molecular imaging.

SSRN Electronic Journal

Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizin... more Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizing mechanical properties that do not exist in ordinary solids. Among these, twisting metamaterials and acoustical chirality are sample-size dependent. The purpose of this work is, first, to examine the mechanical performance of a new twisting cubic metamaterial. Then, we perform a comparative investigation of its twisting behavior using the finite element method on microstructure elements computation, a phenomenological model, and we compare them to Eringen micropolar continuum. Notably, the results of the three models are in good qualitative and quantitative agreements. Finally, a systematic comparison of dispersion relations was made for the continuum and for the microstructures with different sizes in unit cells as final proof of perfect mapping.

2020 1st International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET)

Tumor segmentation from magnetic resonance images (MRI) is an error-prone and time-absorbing proc... more Tumor segmentation from magnetic resonance images (MRI) is an error-prone and time-absorbing process. In this paper, we propose a novel architecture adapting the Optical Scanning Holography (OSH) to the detection of tumors regions in MRI. The proposed method combines an off-axis optical scan, performed by a heterodyne fringe pattern, and a MR image display ensured by a spatial light modulator. The output quadrature component of the scanned current is collected digitally. Hence, a high-precision distribution of biological tissues is extracted. Its maximum position is exactly the one of the tumor. Meanwhile, this position is used in an Active Contour Model (ACM) to perform a fast segmentation of the extent corresponding to the tumors. Several images of brain tumors from BRATS database, with tumors having different contrast and form, are used to test the proposed system. Parameters reverted by the optical process are used to investigate the detection performance. Further, in terms of tumor segmentation, the proposed OSH-ACM process has high performance metrics compared to some of recently published method. The underlying physics of the precision superiority, presented by the OSH-ACM, is the high-precision extraction of the abnormal tissue regions by the quadrature component of the scanned current.

Innovations in Smart Cities Applications Volume 5, 2022

We present in this paper a new method of matching by the adaptive correlation, dedicated to Radar... more We present in this paper a new method of matching by the adaptive correlation, dedicated to Radar applications with stereoscopic vision. This work is related to the detection and calculation of the object depth in the Radar images. This system has the advantage to be invisible and it allows the measurement of the radial distance or the depth of each object separately even at low-altitude. The most classical area-based Methods used in this domain are the cross correlation with a fixed window-size. However, objects presented herein have some variable forms (planes with different sizes and depths). These methods cannot provide a depth directly and separately for every object. The aim of this paper is to present a new algorithm in matching, based on the correlation with chains, that holds account of the object form. The using of the improved chaining method allows the following: Working on a linear description under form of a chained contour list. Possibility of an extended storage for ...

Owing to the rapid of the communication and multimedia technology, documents are distributed thro... more Owing to the rapid of the communication and multimedia technology, documents are distributed through the internet simpler than before, but at the same time, these Advantages can also be used by pirates. The concept of digital watermarking is associated with datahiding technique known Steganography. This mechanism of leading insertion should respect two conditions at least: mark must be indiscernible; the human eye should not differentiate between a not marked and marked image; the watermark should resist any voluntary or involuntary changes. Extraction should be also blind: to extract mark they don’t need original picture. Many watermarking algorithms in the field DCT, wavelet and CDMA have been proposed seeking to optimize a compromise imperceptibility / robustness. Many recent techniques of watermarking are inspired by usual methods of coding and compression. The singular value decomposition (SVD) is one example. In this paper, we present the most recent method of SVD algorithm ap...