Communications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/11

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End date: 2019Has files: No

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Now showing 1 - 10 of 92
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    A distributed security protocol designed for the context of Internet of Things
    (Association for Computing Machinery, 2018) Laouid, Abdelkader; Muath, AlShaikh; Lalem, Farid; Bounceur, Ahcène; Euler, Reinhardt; Bezoui, Madani; Aissaoua, Habib; Tari, Abdelkamel
    In the field of Internet of Things (IoT), many encryption protocols for distributed wireless communication technology have been proposed for use in various applications such as monitoring, healthcare, product management, workplace, home support and surveillance [1]. An IoT system can be looked at as a highly dynamic distributed and networked system composed of a large number of smart devices. In fact, such connected devices suffer from the limitation of resources in terms of computing, energy, bandwidth and storage. Hence, IoT application scenarios require methods to adapt to highly diverse contexts with different available resources and possibly dynamic environments. In this paper, we address these issues by proposing an efficient technique for data protection in the context of IoT. A distributed network architecture is used, where each node is in charge to deliver and/or forward data. The aim is to use efficient operations to protect the exchanged data. The proposed technique ensures the exchanged data to be effectively and securely controlled with a low overhead compared to the classical approaches. The proposed protocol shows its efficiency in terms of overhead, speed, energy and security measurements.
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    A comparison of bond graph Model-Based methods for fault diagnosis in the presence of uncertainties : application to mechatronic system
    (IEEE, 2019) Lounici, Yacine; Touati, Youcef; Adjerid, Smail
    This paper deals with comparing three methods for robust fault diagnosis that generate their residuals using bond graph model. These methods are the causality inversion method, a sensor data combinations method, and a faults/residuals sensitivity relations method. In addition, both parameter and measurement uncertainties are considered to generate the adaptive residual thresholds. Through simulation on a mechatronic system, the presented methods are studied under sensor and parameter faults. The results of the case study are compared for gaining practical insights about the applicability and performance of these methods. The results show that the faults/residuals sensitivity relations method has a better diagnosis performance as compared to the other methods
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    Judd-Ofelt analysis of luminescence emission from Li6Eu1-xSmx(BO3)3 single crystal
    (American Institute of Physics Inc., 2018) Belhoucif, R.; Velazquez, M.; Plantevin, O.; Aschehoug, P.; Goldner, P.; Christian, G.
    A detailed spectroscopic study of Eu3+ ions in the monoclinic Li6Eu1-xSmx(BO3)3 (LSEBx) crystals is reported. The symmetry of the local environment of Eu3+ activators has been confirmed within the framework of the standard Judd-Ofelt theory, using Ω2, Ω4 and Ω6 intensity parameters derived from emission spectra data analysis. With these intensity parameters various radiative properties, like spontaneous emission probability, branching ratio, stimulated emission cross-section and radiative lifetime, have been calculated. The maximum stimulated emission cross section corresponding to the5D0 →7F2 transition is 3×10-21 cm2 at 611 nm. Under UV excitation, the LSEBx crystals provide intense red photoluminescence intensity. These results revealed that LSEBx might be potential materials for optical applications.
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    Convergence assessment of the MCNP5 model for NUR research reactor
    (American Institute of Physics Inc, 2018) Mokhtari, O.; Mazrou, Hakim
    In recent years, the Monte Carlo (MC) methods have become an extensive and reference tool for criticality calculations. Despite the high precision that could be reached in MC modeling, the criticality calculations are still faced with the problem of fission source convergence leading, thereby, in some cases to false convergences and, in particular, to an erroneous effective multiplication factor. This is a challenging issue from a criticality safety point of view. Thus, to prevent from these specific issues and to obtain correct results, a convergence assessment has been carried out, for the first time, in this work, to the MC model of the NUR research reactor initial core. To this end, both effective multiplication factor (keff) and Shannon entropy of the fission source (Hsrc) were evaluated for various M, the number of neutrons per cycle, and for different locations of the initial fission source in the reactor core. From the obtained results, it reveals that: a number of 10000 neutrons/cycles (or more) are needed to reduce bias on keff and at least 30 inactive cycles are required to allow keff convergence. Whereas, the choice of a point source in each fuel element or in each fuel plate are the most preferred assumptions. As for the number of active cycles, it can be fixed according to the reasonable uncertainty that a user may accept for the effective multiplication factor, keff. ©
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    Study of the effect of UV aging on the mechanical properties of a geotextile based on polypropylene
    (American Institute of Physics Inc, 2018) Ghemati, Djamila; Rafa, Nadia; Aliouche, Djamel
    The main objective of this work is to study the effect of aging by UV radiation on the physical and mechanical properties of two types of polypropylene-based non-woven geotextiles. First, a study of the physical, mechanical characteristics was carried out, followed by an aging test by ultraviolet radiation as a function of time in order to evaluate their mechanical characteristics before and after aging using standard tests. The results obtained show that: the mechanical properties such as the tensile strength of a geotextile depend on its areal density and its thickness, so the resistance to static and pyramidal punching increases with increasing geotextile thickness. A significant loss in tensile properties (tensile strength and elongation at break) of about 50% for a time of exposure of geotextiles to UV radiation for 300 h. Finally, it can be concluded that polypropylene geotextiles are sensitive to ultraviolet radiation. Therefore, in order to increase the service life of a geotextile, it is necessary to avoid exposure to light during storage and processing, or to add a stabilizer
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    Development and design of helmholtz coil for NBTI degradation studies
    (IEEE, 2017) Merah, Sidi Mohammed; Nadji, Bouchra
    Laboratory of Electrification of Industrials Enterprises (LREEI) of boumerdes and CDTA have developed an in-house Helmholtz coil. It will be used as a source of external magnetic field for studying the Negative Bias Temperature Instability (NBTI) degradation mechanisms that can influence Metal Oxide Semiconductor (MOS) devices. This paper describes the different phases of design and construction of a Helmholtz coil controlled by a computer. Structure geometry, number of turns in winding and power supply calculations were done. The two windings are connected in series and the magnetic field was measured at different points. The results obtained were satisfactory. The magnetic field is uniform over an approximate length of 22 cm
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    MIMO identification and digital compensator design for quadruple tank process
    (IEEE, 2017) Bekhiti, Belkacem; Dahimene, Abdelhakim; Hariche, Kamel
    In this paper we have described a new design algorithm for the whole set of latent-structure assignment via the approaches of matrix polynomial placement with output noise rejection for a Quadruple tank process, of course the mathematical dynamic model of the process is obtained by MIMO (Simplified Refined Instrumental Variable) SRIV and/or MIMO (Linear Multi Stage Auto Regressive Moving Average with eXogenous input) LMS-ARMAX identification algorithms and then is handled and used in the control procedure which will provide us instead of placing only a set of desired eigenvalues we are able to assign both latent-vectors and the corresponding latent-values or more generally it is more efficient to assign the latent structure via the approach of Block pole placement
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    Modeling and control of UAV quadrotor
    (IEEE, 2019) Zammoum Boushaki, Razika; Aribi, Yacine; Loubar, Hocine; Hamza, Younes; Kouzou, Abdellah
    Since the advances in technologies and the ability to manufacture miniature sensors and controllers using the Micro-Electro-Mechanical Systems (MEMS) technologies, there have been a lot of advances in the Unmanned Aerial Vehicle (UAV) area. A lot of the research conducted focused on the quadrotor due to its previously mentioned advantages of easier manufacturing, compactness and maneuverability among others. a detailed description of the dynamic modelling of the Quadrotor is presented. Various control strategies like the Proportional Derivative Control, the Sliding Mode Control and the Backstepping Control methods have been elucidated and implemented in MATLAB and SIMULINK. Simulations have been carried out and the results have been presented
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    Numerical simulation of natural convection between two concentric isothermal spheres at moderate Rayleigh number
    (American Institute of Physics, 2019) Baghli, Houda; Cheddadi, Abdelkhalek
    The numerical Simulation of natural convection within an incompressible Newtonian fluid confined between two isothermal and concentric spheres is carried out. The phenomenon considered is two-dimensional, axisymmetric and permanent, with an annular space ratio of A = 2, filled with air Pr = 0.7, at moderate Rayleigh number Ra between 103 and 106. Simultaneous resolution of the continuity equations, of Navier-Stokes and energy, is carried out by the combination of the implicit method of alternate directions (ADI) with the method of convergence acceleration by successive replacement (SAR), in the Vorticity-Stream function formulation. The isovalues of temperature T and the steam function ψ obtained, as well as the Average Nusselt number, are in a good agreement with previous studies, and gives new Nusselt number correlation Nu = f(Ra)
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    Entropy generation optimization of a hemispherical anchor agitated batch reactor
    (American Institute of Physics, 2019) Baghli, Houda; Tchouar, Noureddine; Merah, Abdelkrim
    The entropy generation optimization of a hemispherical anchor agitated batch reactor has been studied, to optimize the heat transfer in the process of production of a cosmetic cream cooled by a jacket at industrial scale. The main objective of this optimization of the cooling condition was the improvement of the product quality and the reduction the energy consumption of the process. The phenomenon considered is two-dimensional, axisymmetric and permanent. The entropy generation optimization has been carried out successfully by the simulation of the heat transfer throw the reactor wall and the agitated fluid. The results give the optimum speed velocity for agitation and the optimal cooling time and coolant temperature