Hassan Barada

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In this paper, we discuss a parallel tabu search algorithm with implementation in a heterogeneous environment. Two parallelization strategies are integrated: functional decomposition and multi-search threads. In addition, domain decomposition strategy is implemented probabilistically. The performance of each strategy is observed and analyzed in terms of(More)
In this paper, we present the parallelization of tabu search on a network of workstations using PVM. Two parallelization strategies are integrated: functional decomposition strategy and multi-search threads strategy. In addition, domain decomposition strategy is implemented probabilistically. The performance of each strategy is observed and analyzed. The(More)
This paper describes and analyzes the application of a simulated evolution (SE) approach to the problem of matching and scheduling of coarse-grained tasks in a heterogeneous suite of machines. The various steps of the SE algorithm are first discussed. Goodness function required by SE is designed and explained. Then experimental results applied on various(More)
This paper discusses a strategy for detecting hidden messages in stego-images in Internet traffic. The strategy adopts attacks that are based on both the signatures of the most popular steganographic techniques and some of the statistical parameters of the images being analyzed. A gradual approach for the attacks is applied since the speed with which(More)
This paper proposes a testbed environment for evaluating the security and robustness of the major steganography techniques. The testbed environment allows the embedding of messages into still images, preprocessing to detect the hidden messages and a post processing stage to perform further analysis on an image. The environment was used to test the(More)
This paper applies a simulated evolution (SE) approach to the problem of matching and scheduling dependent tasks in a heterogeneous suite of computers interconnected via a high-speed network. The various steps of the SE approach are discussed in details. Goodness functions required by SE are designed and explained. Experimental results applied on various(More)
As noticed by many internet service providers, the number of internet users is increasing exponentially. Such increase in information demand results in a variety of problems such as network congestion and server overloading which are perceived by the user as a delay in information retrieval. This paper reviews some of the common web caching architectures(More)
Roentgenographical examination was carried out in 56 normal subjects ranging from 12 to 80 years of age with the purpose of evaluating the degrees of the tilted angle of the scapula in three dimensions at the relaxed standing position. Bilateral roentgenograms of shoulder were taken in the standard antero-posterior position and at the 30 degrees of oblique(More)
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