Publications

2023
Boukhalfa G, Belkacem S, Chikhi A. Fuzzy-second order sliding mode control optimized by genetic algorithm applied in direct torque control of dual star induction motor. Journal of Central South University [Internet]. 2023;29 (12) :3974 - 3985. Publisher's Version
Smatti E-M-B, Arar D. Global convergence towards statistical independence for noisy mixtures of stationary and non-stationary signals. International Journal of Information Technology [Internet]. 2023;15 :833–843. Publisher's VersionAbstract

This article deals with the problem of blind separation of statistically independent sources from the instantaneous linear model (n × n). When the observation signals are affected by the additive white gaussian noise (AWGN), the implementation of the proposed solution is performed by following three steps. The first step is a whitening process. The second step aims to convert the uncorrelated signals into statistically independent signals. The last step consists in reducing the noise existing in the noisy estimations. The main part of the proposed solution is to determine the adequate rotating angle (θ) that maximizes the kurtosis of the whitened signals. This rotating angle is obtained through the use of optimization techniques by applying a genetic algorithm. The proposed solution has the advantage of not converging to a local maximum, and also the separation method can be easily generalized to converge directly towards the global maximum for the case of several sources. The results obtained by applying many simulations, prove the effectiveness and the performance of the proposed method even in the noisy case and whatever the type of the signals (stationary or non-stationary).

Grandeurs et décadences des héros de la fiction littéraire
Belaïd MI, Saïdi S. Grandeurs et décadences des héros de la fiction littéraire, in ; 2023.Abstract
Pour deux tiers il est dieu, pour un tiers il est homme. Ainsi est décrit le héros du plus ancien récit de l’humanité : L’Épopée de Gilgamesh. Ce roi omniscient, dont la force est incomparable, règne sur la terre. Il interagit directement avec les divinités. À la fin de son parcours, ayant tout fait, tout connu, tout vécu, il ambitionnera l’immortalité. Cette épopée fut écrite vers le XVIIIème siècle avant J.-C. À la fin du 18ème siècle après J.-C., Pierre-Augustin Caron de Beaumarchais écrit le Mariage de Figaro. Une pièce de théâtre qui a pour personnage principal un simple valet de chambre (anciennement barbier). La force de ce personnage se résume à sa capacité à amuser, à s’immiscer et à intriguer pour le plus grand divertissement du public. Un siècle avant les Lumières, Molière avait déjà dépeint les fourberies de ce valet nommé Scapin. Il nous avait décrit des personnages finalement très ordinaires, comme son malade imaginaire Argan, son incorrigible Tartuffe ou son dragueur compulsif Dom Juan (accompagné de son servant, le prudent Sganarelle). Un siècle après les Lumières, Flaubert relatera par le menu la vie d’Emma : une bourgeoise qui s’ennuie. Le Héros était le tout, faisait tout, était capable du meilleur et du pire. Aujourd'hui et depuis déjà quelques décennies, le personnage principal n'est plus grand chose, il n’est plus central, il est n'importe qui, fait n’importe quoi, aux prises avec les banalités du quotidien. Il n’est plus ce modèle du Bien, du Beau et du Vrai que nous admirons, il est devenu l’exemple d’une déchéance autour de laquelle la jeunesse gravite. Sommes-nous passés, au fil de millénaires de civilisations, des grandeurs héroïques aux décadences ordinaires ? C’est sur quoi portera cette conférence.
z_-_conf_heros.pptx
Maoucha A, Ferhati H, Djeffal F, AbdelMalek F. Highly efficient Cd-Free ZnMgO/CIGS solar cells via effective band-gap tuning strategy. Journal of Computational Electronics [Internet]. 2023;22 :887–896. Publisher's VersionAbstract

This work proposes a new modeling framework based on combining graded band-gap (GBG) engineering and metaheuristic optimization to improve the Cd-Free ZnMgO/CIGS solar cell performances. Analytical and numerical calculations are carried out to assess the influence of band-gap profiles of both buffer and active layers on the electronic and optical properties of the studied solar cell. This investigation shows a great improvement of solar cell efficiency by increasing the optoelectronic figures of merit through tuning and optimizing the band-gap profiles and the conduction band offset at the ZnMgO/CIGS interface. Moreover, metaheuristic-based optimization models are developed to optimize the GBG profiles and enhance the optical and electrical performances of the solar cell. In this context, we recorded very satisfactory results, where the optimized design with GBG paradigm offers a high efficiency of 31.88% compared to 23.35% provided by the conventional CdS/CIGS solar cell. Therefore, this study provides a new strategy in enhancing the efficiency of thin-film solar cells by exploiting the graded band-gap engineering combined with metaheuristic optimization approach.

Hammadi A, Brinis N, Djidel M. Hydrodynamic Characteristics of the “Complex Terminal” aquifer in the Region of Oued Righ North (Algerian Sahara). Algerian Journal of Environmental Science and Technology [Internet]. 2023. Publisher's VersionAbstract
Accessibility of fresh water, the nature’s gift wheels the foremost part of the world economy. The sufficient supplies of water are essential for agriculture, human intake, industry as well as regeneration. The Oued Righ region is located in Algeria’s South-East, specifically in the NorthEast of the Sahara, on the Northern edge of the Grand Erg Oriental and the Southern border of the Aures massif. This area appears as a lower Sahara synclinal basin and is part of a broad North-South trending ditch. It is famous for its date palms, the development of the date culture in this region is attributed not only to the population’s efforts, but above all to the particular climatic conditions, the favorable soil characteristics and the existence of significant groundwater. The aim of this study is to understand the results obtained from using different approaches of water hydrodynamics in the Complex Terminal aquifer. The aquifer’s hydrodynamic characterization was carried out using hydrodynamic parameters and piezometry. As a result, the transmissivity and permeability obtained data using traditional Cooper-Jacob method showed that the flow capacities of the aquifer environment and the productivities of the structures are important in the studied zone where, the highest value of transmissivity equal 2.36× 102-m 2 /sis found in the central part of the study area in El-Meghair. The establishment of piezometric maps reveals a flow direction oriented toward the chott.
H.Beghzim, T.Karech. The impact of seismic waves to evaluate the behaviour of a real case of damaged earth dam. Australian Journal of Civil Engineering [Internet]. 2023 :1-12. Publisher's VersionAbstract
Many earth dams are damaged by shearing under seismic stresses effect. In Algeria, earthquake of 21 May 2003, of magnitude Mm = 6.9 on Richter scale, considered as the most violent for more than 20 years, occurred about 70 km east of Algiers’s capital, where a large number of structures were damaged in this region. The aim of this article is to present a numerical analysis of an earth dam in the province of Oum-Elboughi. The objective is to show the influence of compressive seismic waves and the effect of foundation deph on dam behavior .The stady was carried out using a 2D finite difference method (FDM) using the FLAC 2D calculation code. In this analysis, a soil nonlinear behaviour is provided by a combined Hardin/Drnevich hysteretic damping behaviour model with Mohr–Coulomb elasto-plastic model. Results that are presented in terms of deformations and shear stresses developed at the dam and dam foundation show that the most critical area is located on the downstream side of the dam. Increasing the foundation depth decreases the value of horizontal stress, while decreasing it increases the dam instability risk.
Mimoune Z, Anoune. I, MADANI H. Implementation of PC-SAFT for Predicting Thermodynamic Properties of Pure Refrigerants and Vapor-Liquid Equilibria of Refrigerants Binary Mixtures. Fluid Phase Equilibria. 2023;573 (113868) :1 -24.
Aouag H, Soltani M. Improvement of Lean Manufacturing approach based on MCDM techniques for sustainable manufacturing. International Journal of Manufacturing Research [Internet]. 2023;18 (1). Publisher's VersionAbstract
Over the past few decades, Lean Manufacturing (LM) has been the pinnacle of strategies applied for cost and waste reduction. However as the search for competitive advantage and production growth continues, there is a growing consciousness towards environmental preservation. With this consideration in mind this research investigates and applies Value Stream Mapping (VSM) techniques to aid in reducing environmental impacts of manufacturing companies. The research is based on empirical observation within the Chassis weld plant of Company X. The observation focuses on the weld operations and utilizes the cross member line of Auxiliary Cross as a point of study. Using various measuring instruments to capture the emissions emitted by the weld and service equipment, data is collected. The data is thereafter visualised via an Environmental Value Stream Map (EVSM) using a 7-step method. It was found that the total lead-time to build an Auxiliary Cross equates to 16.70 minutes and during this process is emitted. It was additionally found that the UPR x LWR stage of the process indicated both the highest cycle time and carbon emissions emitted and provides a starting point for investigation on emission reduction activity. The EVSM aids in the development of a method that allows quick and comprehensive analysis of energy and material flows. The results of this research are important to practitioners and academics as it provides an extension and further capability of Lean Manufacturing tools. Additionally, the EVSM provides a gateway into realising environmental benefits and sustainable manufacturing through Lean Manufacturing.
Khodja EAT, Khabtane AEH, Arhab R, Benouchenne D, Bensaad MS, Bensouici C, Erenler R. In vitro assessment of antioxidant, neuroprotective, anti-urease and anti-tyrosinase capacities of Tamarix africana leaves extracts. Journal of Traditional Chinese Medicine [Internet]. 2023;43 (2) :252. Publisher's Version
Khatir A, Bouchama Z, Benaggoune S, Zerroug N. Indirect adaptive fuzzy finite time synergetic control for power systems. Electrical Engineering & Electromechanics [Internet]. 2023;1. Publisher's VersionAbstract

Introduction. Budget constraints in a world ravenous for electrical power have led utility companies to operate generating stations with full power and sometimes at the limit of stability. In such drastic conditions the occurrence of any contingency or disturbance may lead to a critical situation starting with poorly damped oscillations followed by loss of synchronism and power system instability. In the past decades, the utilization of supplementary excitation control signals for improving power system stability has received much attention. Power system stabilizers (PSS) are used to generate supplementary control signals for the excitation system in order to damp low-frequency oscillations caused by load disturbances or short-circuit faults. Problem. Adaptive power system stabilizers have been proposed to adequately deal with a wide range of operating conditions, but they suffer from the major drawback of requiring parameter model identification, state observation and on-line feedback gain computation. Power systems are nonlinear systems, with configurations and parameters that fluctuate with time that which require a fully nonlinear model and an adaptive control scheme for a practical operating environment. A new nonlinear adaptive fuzzy approach based on synergetic control theory which has been developed for nonlinear power system stabilizers to overcome above mentioned problems.

Aim. Synergetic control theory has been successfully applied in the design of power system stabilizers is a most promising robust control technique relying on the same principle of invariance found in sliding mode control, but without its chattering drawback. In most of its applications, synergetic control law was designed based on an asymptotic stability analysis and the system trajectories evolve to a specified attractor reaching the equilibrium in an infinite time. In this paper an indirect finite time adaptive fuzzy synergetic power system stabilizer for damping local and inter-area modes of oscillations for power systems is presented. 

Methodology. The proposed controller design is based on an adaptive fuzzy control combining a synergetic control theory with a finite-time attractor and Lyapunov synthesis. Enhancing existing adaptive fuzzy synergetic power system stabilizer, where fuzzy systems are used to approximate unknown system dynamics and robust synergetic control for only providing asymptotic stability of the closed-loop system, the proposed technique procures finite time convergence property in the derivation of the continuous synergetic control law. Analytical proofs for finite time convergence are presented confirming that the proposed adaptive scheme can guarantee that system signals are bounded and finite time stability obtained. 

Results. The performance of the proposed stabilizer is evaluated for a single machine infinite bus system and for a multi machine power system under different type of disturbances. Simulation results are compared to those obtained with a conventional adaptive fuzzy synergetic controller.

Khatir A, Bouchama Z, Benaggoune S, Zerroug N. Indirect adaptive fuzzy finite time synergetic control for power systems. Power Stations, Grids and Systems [Internet]. 2023;1. Publisher's VersionAbstract

Introduction. Budget constraints in a world ravenous for electrical power have led utility companies to operate generating stations with full power and sometimes at the limit of stability. In such drastic conditions the occurrence of any contingency or disturbance may lead to a critical situation starting with poorly damped oscillations followed by loss of synchronism and power system instability. In the past decades, the utilization of supplementary excitation control signals for improving power system stability has received much attention. Power system stabilizers (PSS) are used to generate supplementary control signals for the excitation system in order to damp low-frequency oscillations caused by load disturbances or short-circuit faults.

Problem. Adaptive power system stabilizers have been proposed to adequately deal with a wide range of operating conditions, but they suffer from the major drawback of requiring parameter model identification, state observation and on-line feedback gain computation. Power systems are nonlinear systems, with configurations and parameters that fluctuate with time that which require a fully nonlinear model and an adaptive control scheme for a practical operating environment. A new nonlinear adaptive fuzzy approach based on synergetic control theory which has been developed for nonlinear power system stabilizers to overcome above mentioned problems.

Aim. Synergetic control theory has been successfully applied in the design of power system stabilizers is a most promising robust control technique relying on the same principle of invariance found in sliding mode control, but without its chattering drawback. In most of its applications, synergetic control law was designed based on an asymptotic stability analysis and the system trajectories evolve to a specified attractor reaching the equilibrium in an infinite time. In this paper an indirect finite time adaptive fuzzy synergetic power system stabilizer for damping local and inter-area modes of oscillations for power systems is presented. 

Methodology. The proposed controller design is based on an adaptive fuzzy control combining a synergetic control theory with a finite-time attractor and Lyapunov synthesis. Enhancing existing adaptive fuzzy synergetic power system stabilizer, where fuzzy systems are used to approximate unknown system dynamics and robust synergetic control for only providing asymptotic stability of the closed-loop system, the proposed technique procures finite time convergence property in the derivation of the continuous synergetic control law. Analytical proofs for finite time convergence are presented confirming that the proposed adaptive scheme can guarantee that system signals are bounded and finite time stability obtained. 

Results. The performance of the proposed stabilizer is evaluated for a single machine infinite bus system and for a multi machine power system under different type of disturbances. Simulation results are compared to those obtained with a conventional adaptive fuzzy synergetic controller.

HARES H, Mebarki G. Influence of Wing Shape on Airfoil Performance: a Comparative Study. WSEAS Transactions on Fluid Mechanics. WSEAS Transactions on Fluid Mechanics [Internet]. 2023;18 :49-57. Publisher's VersionAbstract
The aerodynamic performance of an aircraft mainly depends on the lift force, drag force, and the lift to drag ratio. The geometric shapes of aircraft wings are considered crucial for this aerodynamic performance. The purpose of this study is to determine the most efficient wing shape that improves the aerodynamic performance of the airfoil. For that purpose, a numerical comparative study was carried out between the rectangular and tapered wing shapes of the NACA 4412 airfoil for a wide range of angles of attack in the subsonic regime. ANSYS Fluent software, based on the finite volume method, was used for the numerical resolution of the governing equations. The Realizable k-ε model was chosen for the turbulence modeling. The numerical procedure was validated based on experimental results obtained from the literature. The results show an improvement in the lift coefficient and a reduction in the drag coefficient of the Tapered shape compared to the rectangular shape at all angles of attack. However, a gain was achieved in the lift-to-drag coefficient ratio of the Tapered shape.
Bensaad MS, Kahoul MA, Khier M, Mitra D, Benhoula M, Banjer HJ, Al-Eisa RA, Algehainy NA, Helal M, Al-Mushhin AAM, et al. An Insight-Based Computational Approaches to Estimate Molecular Weight Distribution, Allergenicity and Immunological Aspects, Toxicity Profile, Possible Biodegradation, Persistence and Bioaccumulation Factor of Four Phyto-Compounds. Journal of Biobased Materials and Bioenergy [Internet]. 2023;17 (4) :419-432. Publisher's Version
Benaldjia H, Guedjati MR. Intérêt de la simulation dans l’évaluation de la formation initiale et continue dans la sécurité des soins. ALGERIAN JOURNAL OF HEALTH SCIENCES. 2023;5 (1) :53-63. interest_of_simulation_in_the_evaluation_of_initial_and_continuing_training_in_healthcare_safety.pdf
Saci A, Rebiai S-E. An inverse problem for the Schrödinger equation with Neumann boundary condition. Advances in Pure and Applied Mathematics [Internet]. 2023;14 (1) :50-69. Publisher's VersionAbstract

Thisarticleconcernstheinverse problem of the recoveryof unknown potential coefficient for the Schrödinger equation, in a bounded domain of Rn with non-homogeneous Neumann boundary condition from a time-dependent Dirich let boundary measurement. We prove uniqueness and Lipschitz stability for this inverse problem under certain convexity hypothesis on the geometry of the spatial domain and under weak regularity requirements on the data. The proof is based on aCarleman estimate in [12] for Schrödinger equations and its resulting implication, a continuous observability inequality. Mathematics Subject Classification. 35R30, 35Q40, 49K20.

Mehannaoui R, Mouss K-N, AKSA K. IoT-based food traceability system: Architecture, technologies, applications, and future trends. Food Control [Internet]. 2023;145. Publisher's VersionAbstract
An effective Food Traceability System (FTS) in a Food Supply Chain (FSC) should adequately provide all necessary information to the consumer(s), meet the requirements of the relevant agencies, and improve food safety as well as consumer confidence. New information and communication technologies are rapidly advancing, especially after the emergence of the Internet of Things (IoT). Consequently, new food traceability systems have become mainly based on IoT. Many studies have been conducted on food traceability. They mainly focused on the practical implementation and theoretical concepts. Accordingly, various definitions, technologies, and principles have been proposed. The “traceability” concept has been defined in several ways and each new definition has tried to generalize its previous ones. Nevertheless, no standard definition has been reached. Furthermore, the architecture of IoT-based food traceability systems has not yet been standardized. Similarly, used technologies in this field have not been yet well classified. This article presents an analysis of the existing definitions of food traceability, and thus proposes a new one that aims to be simpler, general, and encompassing than the previous ones. We also propose, through this article, a new architecture for IoT-based food traceability systems as well as a new classification of technologies used in this context. We do not miss discussing the applications of different technologies and future trends in the field of IoT-based food traceability systems. Mainly, an FTS can make use of three types of technologies: Identification and Monitoring Technologies (IMT), Communication Technologies (CT), and Data Management Technologies (DMT). Improving a food traceability system requires the use of the best new technologies. There is a variety of promising technologies today to enhance FTS, such as fifth-generation (5G) mobile communication systems and distributed ledger technology (DLT).
Mehannaoui R, Mouss K-N, AKSA K. IoT-based food traceability system: Architecture, technologies, applications, and future trends. Food Control [Internet]. 2023;145. Publisher's VersionAbstract

An effective Food Traceability System (FTS) in a Food Supply Chain (FSC) should adequately provide all necessary information to the consumer(s), meet the requirements of the relevant agencies, and improve food safety as well as consumer confidence. New information and communication technologies are rapidly advancing, especially after the emergence of the Internet of Things (IoT). Consequently, new food traceability systems have become mainly based on IoT. Many studies have been conducted on food traceability. They mainly focused on the practical implementation and theoretical concepts. Accordingly, various definitions, technologies, and principles have been proposed. The “traceability” concept has been defined in several ways and each new definition has tried to generalize its previous ones. Nevertheless, no standard definition has been reached. Furthermore, the architecture of IoT-based food traceability systems has not yet been standardized. Similarly, used technologies in this field have not been yet well classified. This article presents an analysis of the existing definitions of food traceability, and thus proposes a new one that aims to be simpler, general, and encompassing than the previous ones. We also propose, through this article, a new architecture for IoT-based food traceability systems as well as a new classification of technologies used in this context. We do not miss discussing the applications of different technologies and future trends in the field of IoT-based food traceability systems. Mainly, an FTS can make use of three types of technologies: Identification and Monitoring Technologies (IMT), Communication Technologies (CT), and Data Management Technologies (DMT). Improving a food traceability system requires the use of the best new technologies. There is a variety of promising technologies today to enhance FTS, such as fifth-generation (5G) mobile communication systems and distributed ledger technology (DLT).

La Synchronicite : De L’histoire A La Mythification Dans Les Enfants D’alexandrie De Françoise Chandernagor. multilinguales. 2023.
Large Scale Data using K-means. Mesopotamian Journal of Big Data [Internet]. 2023;2023 (1058496) :38-47. Publisher's Version
Le Coran, Phénomène Ou Noumène ? Malek Bennabi : Al-amr Bi Almâârouf
Saïdi S, Belaïd MI. Le Coran, Phénomène Ou Noumène ? Malek Bennabi : Al-amr Bi Almâârouf. Paradigmes [Internet]. 2023;6 (2716-9022) :25-34. Publisher's VersionAbstract

Paru en 1946, Le Phénomène coranique n’a cessé de susciter une abondante littérature, preuve que l’ouvrage a fait date, et a constitué l’un des monuments de la pensée islamique moderne. Écrit et publié à un moment d’effervescence intellectuelle universelle, Le Phénomène coranique a simplifié le discours d’obédience religieuse, et a sans doute eu l’immense mérite de mieux faire connaître, d’abord pour les pays francophones, puis pour le reste du monde ce livre sacré des musulmans, fondement de l’une des religions monothéistes. Actuellement regardée avec beaucoup de suspicion, si ce n’est du rejet, à travers quelques stéréotypes réducteurs, qui plus est galvaudés autour de l’Arabe, bédouin, indigent habitant d’un désert inhospitalier et hostile. Qui relève beaucoup plus de la poésie d’un illuminé de ce même désert, analphabète et gardien de troupeaux de son état. Telle fut d’ailleurs la vision des Koraïchites, détenteurs du pouvoir, et bénéficiaires de la manne économique de la Mecque.

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