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Houari Hachemi,Abdelhakim Kaci,Mohammed Sid Ahmed Houari,Mohamed Bourada,Abdelouahed Tounsi,S.R. Mahmoud 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.25 No.6
In this paper, a new simple shear deformation theory for bending analysis of functionally graded plates is developed. The present theory involves only three unknown and three governing equation as in the classical plate theory, but it is capable of accurately capturing shear deformation effects, instead of five as in the well-known first shear deformation theory and higher-order shear deformation theory. A shear correction factor is, therefore, not required. The material properties of the functionally graded plates are assumed to vary continuously through the thickness, according to a simple power law distribution of the volume fraction of the constituents. Equations of motion are obtained by utilizing the principle of virtual displacements and solved via Navier's procedure. The elastic foundation is modeled as two parameter elastic foundation. The results are verified with the known results in the literature. The influences played by transversal shear deformation, plate aspect ratio, sideto- thickness ratio, elastic foundation, and volume fraction distributions are studied. Verification studies show that the proposed theory is not only accurate and simple in solving the bending behaviour of functionally graded plates, but also comparable with the other higher-order shear deformation theories which contain more number of unknowns.
Bending analysis of advanced composite plates using a new quasi 3D plate theory
Tarek Houari,Aicha Bessaim,Mohammed Sid Ahmed Houari,Mohamed Benguediab,Abdelouahed Tounsi 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.26 No.5
In this paper, a refined higher-order shear deformation theory including the stretching effect is developed for the analysis of bending analysis of the simply supported functionally graded (FG) sandwich plates resting on elastic foundation. This theory has only five unknowns, which is even less than the other shear and normal deformation theories. The theory presented is variationally consistent, without the shear correction factor. The present one has a new displacement field which introduces undetermined integral variables. Equations of motion are obtained by utilizing the Hamilton's principles and solved via Navier's procedure. The convergence and the validation of the proposed theoretical numerical model are performed to demonstrate the efficacy of the model.
Houari Hachemi,Abdelmoumen Anis Bousahla,Abdelhakim Kaci,Fouad Bourada,Abdeldjebbar Tounsi,Kouider Halim Benrahou,Abdelouahed Tounsi,Mesfer Mohammad Al-Zahrani,S. R. Mahmoud 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.1
This paper presents a high-order shear and normal deformation theory for the bending of FGM plates. The number of unknowns and governing equations of the present theory is reduced, and hence makes it simple to use. Unlike any other theory, the number of unknown functions involved in displacement field is only four, as against five or more in the case of other shear and normal deformation theories. Based on the novel shear and normal deformation theory, the position of neutral surface is determined and the governing equilibrium equations based on neutral surface are derived. There is no stretching–bending coupling effect in the neutral surface-based formulation, and consequently, the governing equations of functionally graded plates based on neutral surface have the simple forms as those of isotropic plates. Navier-type analytical solution is obtained for functionally graded plate subjected to transverse load for simply supported boundary conditions. The accuracy of the present theory is verified by comparing the obtained results with other quasi-3D higher-order theories reported in the literature. Other numerical examples are also presented to show the influences of the volume fraction distribution, geometrical parameters and power law index on the bending responses of the FGM plates are studied.
Houari, Nawal Sad,Taghezout, Noria Korea Information Processing Society 2016 Journal of information processing systems Vol.9 No.3
Our approach permits to capitalize the expert's knowledge as business rules by using an agent-based platform. The objective of our approach is to allow experts to manage the daily evolutions of business domains without having to use a technician, and to allow them to be implied, and to participate in the development of the application to accomplish the daily tasks of their work. Therefore, the manipulation of an expert's knowledge generates the need for information security and other associated technologies. The notion of cryptography has emerged as a basic concept in business rules modeling. The purpose of this paper is to present a cryptographic algorithm based approach to integrate the security aspect in business rules modeling. We propose integrating an agent-based approach in the framework. This solution utilizes a security agent with domain ontology. This agent applies an encryption/decryption algorithm to allow for the confidentiality, authenticity, and integrity of the most important rules. To increase the security of these rules, we used hybrid cryptography in order to take advantage of symmetric and asymmetric algorithms. We performed some experiments to find the best encryption algorithm, which provides improvement in terms of response time, space memory, and security.
Houari, Ali,Benguediab, Mohamed,Bakora, Ahmed,Tounsi, Abdelouahed Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4
In present work, both the hyperbolic shear deformation theory and stress function concept are used to study the mechanical and thermal stability responses of functionally graded (FG) plates resting on elastic foundation. The accuracy of the proposed formulation is checked by comparing the computed results with those predicted by classical plate theory (CPT), first-order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT). Moreover, results demonstrate that the proposed formulation can achieve the same accuracy of the existing HSDTs which have more number of governing equations.
Houari Sabirin(호와리),Munchurl Kim(김문철) 한국방송·미디어공학회 2012 한국방송공학회 학술발표대회 논문집 Vol.2012 No.7
This paper presents a graph-based method of detecting and tracking moving objects in H.264/SVC bitstreams for video surveillance applications that makes use the information from spatial base and enhancement layers of the bitstreams. In the base layer, segmentation of real moving objects are first performed using a spatio-temporal graph by removing false detected objects via graph pruning and graph projection, followed by graph matching to precisely identify the real moving objects over time even under occlusion. For the accurate detection and reliable tracking of moving objects in the enhancement layer, as well as saving computational complexity, the identified block groups of the real moving objects in the base layer are then mapped to the enhancement layer to provide accurate and efficient object detection and tracking in the bitstreams of higher resolution. Experimental results show the proposed method can produce reliable results with low computational complexity in both spatial layers of H.264/SVC test bitstreams.
Hydrodynamic study involving a maxblend impeller with yield stress fluids
Houari Ameur,Mohamed Bouzit,Mustapha Helmaoui 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"In the present study, the hydrodynamic characteristics of the Maxblend impeller have been investigated. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterize the flow patterns at every point. A shear thinning fluid with yield stress was modeled in the laminar regime and transition regime. The study focused on the effect of fluid rheology, agitator speed,impeller clearance from the tank bottom and blade size on the fluid flow and power consumption. Predictions have been compared with literature data and a satisfactory agreement has been found."
Ali Houari,Mohamed Benguediab,Ahmed Bakora,Abdelouahed Tounsi 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4
In present work, both the hyperbolic shear deformation theory and stress function concept are used to study the mechanical and thermal stability responses of functionally graded (FG) plates resting on elastic foundation. The accuracy of the proposed formulation is checked by comparing the computed results with those predicted by classical plate theory (CPT), first-order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT). Moreover, results demonstrate that the proposed formulation can achieve the same accuracy of the existing HSDTs which have more number of governing equations.
Hemida Houari,Koula Doukani,Abdelkader Zitouni,Brahim Miloud,Houcine Beggar,Hasna Bouhenni 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.3
The objective of our study was to evaluate the wound healing effect of ethanolic extracts of pistachio (Pistacia lentiscus L.) leaves and holm oak (Quercus ilex L.) bark on full-thickness excisions (4 cm2) in Wistar rats. Forty-two rats were divided into seven equal groups that received different treatments; two groups were treated with Quercus ilex bark extract (10% and 30%), two other groups with Pistacia lentiscus leaves extract (10% and 30%), one group received Cicatryl-bio® and considered as a positive control, a group treated with pure Petroleum jelly, and the last was left as an untreated negative control. The evaluation of the excision zones was estimated by a planimetric study using an image processing software (ImageJ®) and histological examination of healed skin tissue. The results revealed that Pistacia lentiscus leaves and Quercus ilex bark promote wound healing effect because they accelerated wound contraction and reduced epithelialization period. Ointments prepared from Quercus ilex bark and Pistacia lentiscus leaves ethanolic extracts exhibited effective wound healing action in Wistar rat’s skin excisions. Both preparations showed an accelerated healing process compared to the other formulations. To the best of the author’s knowledge, this is the first study of wound healing effect of pistachio (Pistacia lentiscus) leaves and holm oak (Quercus ilex) bark.
Graph-based Object Detection and Tracking in H.264/AVC bitstream for Surveillance Video
호와리(Houari Sabirin),김문철(Kim Munchurl) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.11
In this paper we propose a method of detecting moving object in H.264/AVC bitstream by representing the 4x4 block partition units as nodes of graph. By constructing hierarchical graph by taking into account the relation between nodes and the spatial-temporal relations between graphs in frames, we are able to track small objects, distinguish two occluded objects, and identify objects that move and stop alternatively.