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Ajouli A.,High Institute of Applied Sciences and Technology
Proceedings - 41st Euromicro Conference on Software Engineering and Advanced Applications, SEAA 2015 | Year: 2015

Softwares evolve and continue to change during their life cycle in order to satisfy new requirements. Such evolution has a cost which depends on the degree of maintenance complexity and modules dependencies. Many software structures such as design patterns represented solutions to make maintenance being modular and not transverse, but each one of these structures corresponds to a specific case of maintenance task. In this paper, we propose a so called Shadow structure for performing modular evolutions of Java program methods implementations. We give specification of this structure and we show how to implement it in Java programs. We discuss its effectiveness in facilitating maintenance and increasing cohesion. © 2015 IEEE. Source

Jemai K.,High Institute of Applied Sciences and Technology
Journal of Intelligent and Fuzzy Systems | Year: 2016

In this article, we have an interested implementing new intelligent strategies based on fuzzy controllers, for a better integration of renewable energy in the powerful electrical networks, commonly called super grids. A preliminary investigation has allowed us to learn more about the impact of this integration on algebraic variables of an electrical network on one hand and on the modes of operation of power plants on the other. Indeed, if necessary to ensure the strategic balance production and consumption, especially during peak hours, power operators shall ensure that the integration of one or more wind farms does not affect any aspect of the quality Energy distributed to subscribers. Perfect stability of large power grids at times of integration of renewable energy sources is ensured through the use of new strategies constituting a potential support which acts to overcome the hazards may hinder the operation of the components basic of these grids. © 2016 - IOS Press and the authors. Source

Bouabid M.,Gabes University | Magherbi M.,High Institute of Applied Sciences and Technology | Hidouri N.,Gabes University | Brahim A.B.,Gabes University
Entropy | Year: 2011

Natural convection in an inclined rectangular cavity filled with air is numerically investigated. The cavity is heated and cooled along the active walls whereas the two other walls of the cavity are adiabatic. Entropy generation due to heat transfer and fluid friction has been determined in transient state for laminar natural convection by solving numerically: the continuity, momentum and energy equations, using a Control Volume Finite Element Method. The structure of the studied flows depends on four dimensionless parameters which are: the thermal Grashof number, the inclination angle, the irreversibility distribution ratio and the aspect ratio of the cavity. The obtained results show that entropy generation tends towards asymptotic values for lower thermal Grashof number values, whereas it takes an oscillative behavior for higher values of thermal Grashof number. Transient entropy generation increases towards a maximum value, then decreases asymptotically to a constant value that depends on aspect ratio of the enclosure. Entropy generation increases with the increase of thermal Grashof number, irreversibility distribution ratio and aspect ratio of the cavity. Bejan number is used to measure the predominance of either thermal or viscous irreversibility. At local level, irreversibility charts show that entropy generation is mainly localized on bottom corner of the left heated wall and upper corner of the right cooled wall. © 2011 by the authors; licensee MDPI, Basel, Switzerland. Source

Rhif A.,High Institute of Applied Sciences and Technology
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2011

The Sun Tracker is an automated solar panel that actually follows the sun position to increase the power production. After some measurements, the Sun Tracker increases the power production by more than 40% by keeping the panels parallel to the sun that makes the sun rays fall perpendicularly on the solar panel. In this paper, we present a sun tracker without using sun sensors. The sun tracking is performed by changing the solar panel orientation in horizontal and vertical directions by two motors. The control of these motors is ensured by a microcontroller. The proposed system has the capability to track using the location data of the sun. Source

Rhif A.,High Institute of Applied Sciences and Technology
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2011

A new autonomous underwater vehicle (AUV) called H160 is described in this article. The first prototype of this AUV has been realized through collaboration between two partners, which are the Laboratory of Data processing, Robotics and Micro electronic of Montpellier (LIRMM) and the ECA-HYTEC (specialist in the design and manufacture of remote controlled systems in "hostile" environments). This paper shows a general presentation of the vehicle, its hardware and software architecture including the process modeling and the control law used. Simulation results presented are based on the AUV mathematical model. Source

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