المؤتمـــــــرات
Permanent URI for this community
Browse
Browsing المؤتمـــــــرات by Issue Date
Now showing 1 - 20 of 569
Results Per Page
Sort Options
Item Les villes petites et moyennes dans un monde globalisé(Université d'Oum El Bouaghi, 2021) Bousmaha, AhmedItem أعمال المؤتمر العلمي الدولي الافتراضي الثاني حول مساهمة العلوم البيوطبية في تطويرالأداء الرياضي النخبوي أيام 29-30 ماي2021(جامعة أم البواقي, 2021) مالك, رضاتهدف الدراسة إلى التعرف على أثر كل من التدريب المتقطع والتدريب الفتر ي على السرعة الهوائية القصوى وقدرة الاسترجاع لدى لاعب ي كر ة القدم أكابر.ولهذا الغ رض استخدمنا المنهج التجريبي، على عينة متكونة من 40 لاعبا، مقسمة إلى عينتي ن 20 لاعبا من كل فريق. وقد تم اختياره ا بشكل قصدي من نادي أمل شلغوم العبد ونادي 2020 . لجم ع / شباب ميلة للموسم الرياض ي 2019 Polar و جهاز GPS البيانات استخدمنا جهاز والاختبارات البدنية بعد جمع النتائج ومعالجته ا إحصائيا تم التوصل إلى أ ن التدريب المتقطع أكثر فعالية من التدريب الفتري في تطوير السرعة الهوائية القصوى قدرة الاسترجاع لدى لاعب ي كر ة القدم أكابر. The study aims to identify the effect of both intermittent training and interval training on the maximum air speed and recovery ability of senior football players. For this purpose, we used the experimental method, on a sample of 40 players, divided into two samples, 20 players from each team. She was intentionally selected from Amal Shalghoum Al-Abed Club and Mila Youth Club for the 2019/2020 sports season. To collect the data, we used GPS, Polar and physical tests. After collecting the results and processing them statistically, it was concluded that intermittent training is more effective than interval training in developing the maximum aerobic speed and recovery capacity of senior football playerItem تدويل التعليم المحاسبي(جامعة ام البواقي, 2021) جفال, خالدItem Novel approach to estimate remaining useful life in condition based maintenance(University of Oum El Bouaghi, 2021) Abderrezek, Samira; Bourouis, AbdelhabibDeep learning is an efficient tool for Remaining Useful Life (RUL) estimation, which is crucial for intelligent prognosis and Condition-Based Maintenance (CBM) strategies. To achieve this task, Bidirectional long short-term memories have been preferred for their ability to identify patterns of temporal sequences independently, and Convolutional Autoencoder is performed in extracting features. To benefit from the advantages of these two deep learning models, this paper proposes their hybridization. We investigate the best configuration by varying the values of the hyperparameters and evaluating their impact on the new model’s performance. Finally, it is compared with other similar models in order to study the effectiveness of the approach.Item University course and examination timetables scheduling using a multi-agents system(University of Oum El Bouaghi, 2021) Betaouaf, Hicham Talib; Boukli, Hacene RababScheduling is one of the important topics conducted over the years in several studies. One part of the schedule is known as university timetables. The most universities are faced with this NP-hard problem. The timetabling process must be performed on a regular basis for every academic semester and is daunting and time consuming. The aim of this research was to create an integrated method for creating a timetable of university courses in our department using a multi-agent approach and genetic algorithms. This method allows faculty members and department heads to plan, monitor, screen, and edit all events related to their classes. The timetable is created collaboratively and cooperatively by three agents: Capture Agent, Processing Agent, and Distributing Agent. Several simulations were conducted to assess system performance by evaluating the human and material constraint satisfaction rate.Item Condition classification for bearing fault based on machine learning using GUI(University of Oum El Bouaghi, 2021) Souaidia, Chouaib; Thelaidjia, Tawfik; Chenikher, SalahIn this paper, a new method based on a graphical user interface is developed for bearing fault diagnosis. The suggested method consists of using statistical parameters for feature extraction. Then the classification task is guaranteed using two classifiers namely: neural networks and random forest. The suggested approach is tested based on the bearing dataset provided by the Case Western Reserve University, Bearing Data Center. To facilitate the exploitation of the proposed approach a GUI has been developed. The obtained results show the effectiveness and the simplicity of the proposed approach for bearing fault diagnosis.Item Use of wavelet transforms in segmentation of retinal angiography images(University of Oum El Bouaghi, 2021) Debbou, Hanane; Megri, Abederrahim Fayçal; Ghennam, SouhailaMedical imaging plays a very important role in the non-invasive visualization of anatomical components in humans. In this work we focus on the retinal fundus by studying retinal angiography images. An algorithm for the extraction of the vascular tree has been developed, based on the enhancement by means of the Shrearlet transform, then on the decomposition by the continuous wavelet transform via the Morlet wavelet to finally proceed to a segmentation based on the thresholding on histogram.Item Maximum power point tracking for a PV system using support vector machine(University of Oum El Bouaghi, 2021) Bayarassou, Houria; Megri, Abderrahim Fayçal; Bennour, HachemSince the maximum power point (MPP) of a photovoltaic system changes with the changes in irradiation and temperature, an appropriate maximum power point tracking (MPPT) controller must be applied in the photovoltaic system. In this article, one of the powerful machine learning, support vector machine (SVM) is used as a predictive model, combining two traditional MPPT methods and the most commonly used: perturb and observation and incremental conductance to force photovoltaic systems to operate more efficiently In different weather conditions. The effectiveness of the proposed method is verified by Mathlab/Simulink simulation.Item A new lightweight approach to mitigate the version number attack in RPL-based IoT networks(University of Oum El Bouaghi, 2021) Belkheir, Mohammed; Rouissat, Mehdi; Belkhira, Hicham Sid AhmedIn the recent few years, the cybersecurity challenge stood out to the research community with the drastic evolution of IoT networks. The present article deals with the version number attack, a major security concern for IoT networks using RPL as routing protocol. Although a number of techniques have been proposed to mitigate this kind of attack, the main challenge of the proposed technique remains to contemplate the limited capabilities of the embedded devices composing the network in terms of computing, storage and energy. This makes decentralized heavy algorithms and cryptographic solutions not suitable to cope with the inherited resources of nodes and the network core routing operations. The main purpose of our present work is to implement a new lightweight approach aiming to reduce the destructive effect of the version number attack, whereby the node takes into consideration only the version number received from its preferred parent and ignores other versions of its neighborhood. This leads to propagate the same version number value of the root node over the entire network and ensures the network integrity, by reducing the repeated global repair process caused by falsified values of the version number. The proposed method is implemented under Contiki 3.0 operating system and simulations are performed using COOJA for different scenarios while changing the intruder node position in the network. The obtained results obviously depict that our proposed method yields better aftermath, where the energy saving is between 10% and 50%, depending on the intruder position, while the control overhead is between 2% and 50%.Item Efficient STATCOM based on hybrid sliding mode controlproportional integral control and 48-pulse converter(University of Oum El Bouaghi, 2021) Belila, Hassen; Boudjerda, Nasserdine; Boubakir, Ahsene; Bahri, ImenFlexible alternating current transmission systems (FACTS) evolved as a result of the development of power electronics and began to play a key role in improving the quality of Network power. The purpose of this work is to provide a control strategy of voltage and reactive power flow in one of the most used FACTS devices known as STATCOM. This strategy is based on a hybrid control (sliding mode control-classic PI control), in addition STATCOM uses a 48-pulse converter. The simulations proved the efficiency of the proposed system in both the control performance and harmonic distortion rate of the current injected into the grid.Item Control of reaction and thermo-acoustic instabilities of a combustion chamber(University of Oum El Bouaghi, 2021) Debbah, A.; Kerboua, A.; Klaiaia, R.This paper deals with the improvement of the control and the vanishing of the thermo-acoustic instability in gas-turbine engine combustors via a design of an active controller. The proposed design used a multi-objective genetic algorithm (MOGA) and multi-objective particle swarm optimization (MOPSO) to stabilize the unstable system from limit cycle with uncertain model. These parameters were chosen to minimize four objective functions: the mass fraction of the fuel produced, temperature control, flame fluctuation and the variation in the flow mass rate of input fuel. In addition, an improvement in suppression of the instability was achieved by coupling the combustor and the unsteady heat perturbations and thermos-acoustic models in simulation.Item Simple criterions to achieve hybrid dislocated synchronization of two identical chua’s circuits(University of Oum El Bouaghi, 2021) Zemmal, Badreddine; Mellal, Saida; Hamma, Issam; Maizi, Marwa; Ziar, Toufik; Farah, Hichem; Ouannas, AdelThis paper presents simple criterions to achieve synchronization scheme between two chaotic systems combining tow classical synchronizations i.e the hybrid synchronization (HS) and the dislocated synchronization(DS) , the novelty of the proposed scheme named hybrid dislocated synchronization ( HDS synchronization for short) is that it is much more simple to perform. Two mathematical theorems present the necessary and sufficient conditions under which (HDS) synchronization can be achieved. To show the effectiveness of our approach, numerical example of the (HDS) synchronization of two identical Chua's circuits is executed.Item Contribution on modeling and control of a wind power system based on fuzzy(University of Oum El Bouaghi, 2021) Baladji, Djalal; Lamamra, KheireddineIn this work, we study the modeling and control of a wind energy conversion chain based on a Dual Power Asynchronous Machine. First, the mathematical model of the whole system under study is developed in d-q Park coordinates. Then, the proposed control strategy is designed based on a fuzzy logic control technique that gives good results. Finally, the results of the different simulations of the whole conversion chain, performed under MATLAB/Simulink environment, are presented.Item Study and simulation of a photovoltaic solar panel connected to the electrical network(University of Oum El Bouaghi, 2021) Mekki, Mounira; Cherifi, DjamilaThis work presents a photovoltaic generation system, and deals with the connection of a photovoltaic system to the three-phase electricity grid. This system injects solar energy into the grid as active power. This injection is carried out through a single-stage conversion system, consisting of a DC-DC converter (Boost) and an AC DC inverter. MPPT controller is applied for point tracking of maximum power of PV system under normal lighting and temperature conditionsItem Reconfigurable Multirotor Control Using Fractional-Order PIxDu Controller in the Presence of Uncertain Geometric Parameters(University of Oum El Bouaghi, 2021) Derrouaoui, Saddam Hocine; Bouzid, Yasser; Guiatni, MohamedIn this work, and for the first time, a Fractional Order Proportional Integral Derivative (FOPID) controller tuned by Particle Swarm Optimization (PSO) algorithm, is investigated to control and stabilize the attitude and position of a reconfigurable multirotor in the presence of uncertain geometric parameters. Furthermore, the variation of the structure parameters makes the flight stability and control of this aerial vehicle very challenging tasks differently to the classical drone. Our proposed control architecture considers the variable dynamic of this structure and calculates these changes on-line in the control loop.Item Comparison of tow methods P&O and fuzzy logic controller for MPPT in the photovoltaic system(University of Oum El Bouaghi, 2021) Khelaifa, Fethi; Lamamra, Kheireddine; Toumi, DjaafarAn important consideration in the use of the PV system is to operate the system near the maximum power point to increase the output efficiency of the PV panel. Maximum power point tracking (MPPT) techniques are used in PV applications to extract the maximum power that the PV panel can produce, which depends on different atmospheric conditions, namely solar insolation and temperature. In this paper, a new maximum power point tracker using fuzzy set theory is proposed to improve the energy conversion efficiency. A fuzzy algorithm based on linguistic rules describing the operator control strategy is applied to the boost converter control so that the maximum power point tracker linguistic variables implemented in the fuzzy logic controller were appropriately selected to modulate the DC-DC converter. The fuzzy logic controller offers advanced features such as fast response, good oscillation performance the results obtained are compared with the P&O technology.Item Stability enhancement of a single machine infinite bus system using H-infinity control(University of Oum El Bouaghi, 2021) Khelloufi, Abdeslem; Sari, Bilal; Chouaba, Seif EddineThis work presents a robust H∞ output feedback control design of a Power System Stabilizer (PSS). This PSS is used to damp low-frequency oscillations in power systems over a wide range of operating conditions. The H∞ control is employed in the Single-Machine connected to an Infinite Bus (SMIB) system using two weighting functions. The proposed stabilizer offers robust stability against different external disturbances and parameter uncertainties. A comparative simulation study shows a significantly enhancement and good performance of the proposed design compared to an IEEE conventional power system stabilizer.Item Performance enhancing of 3-phase UPQC using feedback linearisation based DPC technique for power quality improvement(University of Oum El Bouaghi, 2021) Dahdouh, Adel; Mazouz, Lakhdar; Brahim, Elkhalil YoucefaThis paper presents the compensation principle using feedback linearization based DPC control strategies of the unified power quality conditioner, which aims at the integration of series-active and shunt-active power filters. In order to improve the performances of UPQC, a control method based on a feedback linearization based DPC controller combined with space vector modulation (SVM) is proposed. The purposes are to deliver compensation signals more quickly and accurately at varied load conditions and to eliminate voltage as well as current harmonics with good dynamic response. Extensive simulation results obtained by Matlab/Simulink for a passive load connected through an uncontrolled bridge rectifier validate the performance of the suggested control scheme. The comparison of these results with those obtained with a PI controller demonstrates the superiority of the proposed controller.Item Torque ripple reduction of induction machine a comparison between two approaches DTC-SVM(University of Oum El Bouaghi, 2021) Djaghdali, LakhdarThe paper deals with a comparison between two DTC-SVM approaches: DSVM-DTC with a hysteresis controllers and MPDTC with a predictive controller. In DTC-SVM, the switching frequency is limited by the sampling frequency; its theoretical maximum value is half the sampling frequency. However, in reality the switching frequency is lower than this value, and thus, high flux and torque ripples occur compared with modulator-based control methods. In order to overcome this, an optimization problem is formulated and solved in real time. Thereby, apart from the regulation of the torque and the flux magnitude to their references, an additional control objective should be met: the minimization of the torque and flux ripple. To do so, the time point at which the switches of the inverter should change state is calculated. Following the formulation of both approaches, their implementation in the Matlab-Simulink environment has been treated. The transient behavior as well as the steady state features of the induction motor drive under both DTC-SVM approaches are compared and commented. The comparison is based on several criteria including: static and dynamic performance, structure and implementation complexity, and especially decoupling, torque and flux ripple. It has been found that the second approach MPDTC yields high dynamic performances in the whole speed range. These performances are characterized by a low torque ripple with a high capability to eliminate the demagnetization problem which penalizes the flux regulation at low speeds in the first DTC-SVM approach. However, the second DTC-SVM approach with a predictor controller requires much more CPU time than the first one.Item NOVEL DESIGN OF PHOTONIC CRYSTAL STRUCTURE BASED ON A COUPLED MICROCAVITYWAVEGUIDES FOR ALL-OPTICAL AND LOGIC GATES(University of Oum El Bouaghi, 2021) Derdour, Roumaissa; Lebbal, Mohamed Redha; Mouetsi, Souheil; Hocini, Abdesselam; Sadoun, BoumedieneIn this study, the transmission of the all-optical AND logic gate using a structure connected with a triangular photonic crystal lattice is improved. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing the size of the air holes. In addition to the simplicity, the response time is very short and the designed nano-resonator increases the bit rate of the logic gate. The twodimensional finite difference time domain (2DFDTD) method is used to simulate the structure, the transmission obtained is about 98% with very negligible losses. The proposed photonic crystal AND logic gate are widely used in future integrated optical microelectronics.