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Search Results: 1 - 10 of 223879 matches for " R. Boudour "
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SYMTC: Towards a Symbolic Model Checking for the Codesign
R. Boudour,M.T. Kimour
Asian Journal of Information Technology , 2012,
Abstract: The verification of finite-state systems by model-checking often requires to generate (a large part of) the state space of the system under analysis. In this study, we aim at improving the performances of state space construction by using an efficient method to avoid state explosion problem in model checking through the use of-DBM (Difference Bounded Matrices) and on the fly strategy. This approach requires at any time, only the needed states to be in memory and allows for checking several properties, especially, safety, bounded liveness and temporal correctness, which are the most important ones in reactive systems. The specifications are expressed in timed automata and TCTL for the system and properties respectively. The effectiveness of our approach has been demonstrated on many academic examples. The results obtained demonstrate that it is able to verify several properties that could not be checked by other state-of-the-art tools.
SYMTC: An Efficient Symbolic Model Checker for Embedded Systems
R. Boudour,M.T. Laskri,M.T. Kimour
Information Technology Journal , 2006,
Abstract: In this study, we aimed at improving the performances of state space construction by using an efficient method to avoid state explosion problem in model checking through the use of-DBM (Difference Bounded Matrices) and on the fly strategy. This approach requires at any time, only the needed states to be in memory and allows for checking several properties, especially, safety, bounded liveness and temporal correctness, which are the most important ones in reactive systems. The specifications are expressed in timed automata and TCTL for the system and properties, respectively. The effectiveness of our approach has been demonstrated on many academic examples. The results obtained demonstrate that it is able to verify several properties that could not be checked by other state-of-the-art tools.
Model Transformation for Requirements Verification in Embedded Systems
Rachid Boudour,Mohamed T. Kimour
Asian Journal of Information Technology , 2012,
Abstract: In embedded systems, use cases have become increasingly popular as a means of requirements specification and drive all the development activities,particularly in validation ones. However, they are usually written in informal text form describing the interactions between the environment and the system. This prevents using formal methods in requirements verification. Though, they are becoming a practical means to ensure the correctness of system models, formal methods still are not commonplace in embedded systems especially in the requirements validation. In this study presenst an approach to model transformation for requirements verification in embedded systems. It firstly consists of transforming the use case structured-text style into an UML activity diagram, which may be reused in the subsequent development steps and secondly we transform this diagram into Pres, a formal notation capable of capturing relevant features of embedded systems. In addition to the offered formal verification framework, we argue that our approach enables enriching the use case model and producing more precise and complete requirements.
Microstructural Evolution in Terms of Porosity in High-Tc Superconductors
Ahmed Ouari,Mohamed Guerioune,Amar Boudour,Youcef Boumaiza
Asian Journal of Information Technology , 2012,
Abstract: The low critical current densities of high-Tc superconductors materials can be related to the microstructural imperfections such as pores and microcracks which reduce the effective current carrying cross section. The present study examines the characterisation of the state of microstructure and its evolution during thermal treatment of YBa2Cu3O7- . The dilatometric analysis was used to study the shrinkage mechanism during sintering. The microstructure of the sintered samples was characterised in terms of pores distribution and apparent density. Open porosity was measured by mercury porosimeter. In order to compare the results, ultrasonic characterisation such as the longitudinal and transverse wave velocities in the ceramic was carried out. From an ultrasonic point of view, these microstructural features act as inhomogeneities, then the measured ultrasonic parameters will depend on the geometrical arrangement of the microstructure (pores have an effect both on Young s modulus and attenuation).
Evaluation of genetic diversity of an algerian durum wheat (Triticum durum Desf.) collection
Boudour Leila,Gherroucha Hocine,Boukaboub Amar,Bouchtab Karima
Journal of Stress Physiology & Biochemistry , 2011,
Abstract: Durum wheat (Triticum durum Desf.) has been extensively cultivated in Algeria for many centuries. During this long period, the species encountered a large diversification implied by the great diversity of climates that led to great genetic diversity of the species. The purpose of this study is to improve the management of phytogenetic resources that can serve as potential breeders for the amelioration of wheat. The study aims at evaluating the diversity of 1019 accessions of durum wheat from different regions of Algeria and which are stored at the Constantine ITGC. The analysis of the results concerning phenological and morphophysiological characters revealed an important intra and intervarietal genetic variability. Subsequently it appeared that the 1019 accessions belong to 19 botanic varieties that differ mainly by the cob, silk and grain colours. Among the characters involved in this study, some appeared to have a direct connection with the adaptation to water stress and thus allowed us identifying the most resistant varieties.
Toward Intelligent Biped-Humanoids Gaits Generation
Nizar Rokbani,Boudour Ammar Cherif,Adel M. Alimi
Computer Science , 2012, DOI: 10.5772/6732
Abstract: In this chapter we will highlight our experimental studies on natural human walking analysis and introduce a biologically inspired design for simple bipedal locomotion system of humanoid robots. Inspiration comes directly from human walking analysis and human muscles mechanism and control. A hybrid algorithm for walking gaits generation is then proposed as an innovative alternative to classically used kinematics and dynamic equations solving, the gaits include knee, ankle and hip trajectories. The proposed algorithm is an intelligent evolutionary based on particle swarm optimization paradigm. This proposal can be used for small size humanoid robots, with a knee an ankle and a hip and at least six Degrees of Freedom (DOF).
Power Aware Routing Protocol (PARP) for Wireless Sensor Networks  [PDF]
R. Prema, R. Rangarajan
Wireless Sensor Network (WSN) , 2012, DOI: 10.4236/wsn.2012.45019
Abstract: Several wireless sensor network applications ought to decide the intrinsic variance between energy efficient communication and the requirement to attain preferred quality of service (QoS) such as packet delivery ratio, delay and to reduce the power consumption of wireless sensor nodes. In order to address this challenge, we propose the Power Aware Routing Protocol (PARP), which attains application-specified communication delays at low energy cost by dynamically adapting transmission power and routing decisions. Extensive simulation results prove that the proposed PARP attains better QoS and reduced power consumption.
An Innovative Low Cost EM Pollution Measurement System  [PDF]
R. Sittalatchoumy, R. Seetharaman
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78176
Abstract: Mobile phones and other electronic devices are emitting radiations that will provide harmful effects to the human health. In order to measure the radiation, an innovative low cost measurement system is proposed in this paper. The ideology is to simplify the circuit’s value by converting a voltage detecting circuit to a field detecting circuit by finding an optimum resistance on trial and error basis. The requirement for a trial and error technique is to not allow too high or too low resistance which can be either short or open, resulting provides more damage to the circuit.
Ant Lion Optimization Approach for Load Frequency Control of Multi-Area Interconnected Power Systems  [PDF]
R. Satheeshkumar, R. Shivakumar
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79206
Abstract: This work proposes a novel nature-inspired algorithm called Ant Lion Optimizer (ALO). The ALO algorithm mimics the search mechanism of antlions in nature. A time domain based objective function is established to tune the parameters of the PI controller based LFC, which is solved by the proposed ALO algorithm to reach the most convenient solutions. A three-area interconnected power system is investigated as a test system under various loading conditions to confirm the effectiveness of the suggested algorithm. Simulation results are given to show the enhanced performance of the developed ALO algorithm based controllers in comparison with Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Bat Algorithm (BAT) and conventional PI controller. These results represent that the proposed BAT algorithm tuned PI controller offers better performance over other soft computing algorithms in conditions of settling times and several performance indices.
Obtaining Optimal Solution by Using Very Good Non-Basic Feasible Solution of the Transportation and Linear Programming Problem  [PDF]
R. R. K. Sharma
American Journal of Operations Research (AJOR) , 2017, DOI: 10.4236/ajor.2017.75021
Abstract: For the transportation problem, Sharma and Sharma [1] have given a very computationally efficient heuristic (runs in O(c*n2) time) to give very good dual solution to transportation problem. Sharma and Prasad [2] have given an efficient heuristic (complexity O(n3) procedure to give a very good primal solution (that is generally non-basic feasible solution) to transportation problem by using the very good dual solution given by Sharma and Sharma [2]. In this paper we use the solution given by Sharma and Prasad [2] to get a very good Basic Feasible Solution to transportation problem, so that network simplex (worst case complexity (O(n3*(log(n))) can be used to reach the optimal solution to transportation problem. In the second part of this paper, we give a simple heuristic procedure to get a very good BFS to linear programming problem from the solution given by Karmarkar [3] (that generally produces a very good non-basic feasible solution in polynomial time (O(n5.5)). We give a procedure to obtain a good BFS for LP by starting from the solution given by Karmarkar [3]. We note that this procedure (given here) is significantly different from the procedure given in [4].
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