AAST

Cairo, Egypt
Cairo, Egypt

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Hamza H.S.,Cairo University | Taha I.,AAST
Proceedings of the International Conference on Software Engineering and Knowledge Engineering, SEKE | Year: 2013

There are several studies in the literature to assess the properties of a class diagram without taking into consideration the added complexity due to using object constraint language (OCL). This paper presents integrated frameworks that consider class diagram augmented with rules and constraints embedded in the problem domain and encoded using OCL to investigate the benefit and/or impact of using OCL. The proposed framework is theoretically and empirically validated. Copyright © 2013 by Knowledge Systems Institute Graduate School.


Ibrahim H.E.A.,Arab Academy for Science and Technology | Serag M.F.,AAST
World Academy of Science, Engineering and Technology | Year: 2011

In this paper, Novel method, Particle Swarm Optimization (PSO) algorithm, based technique is proposed to estimate and analyze the steady state performance of self-excited induction generator (SEIG). In this novel method the tedious job of deriving the complex coefficients of a polynomial equation and solving it, as in previous methods, is not required. By comparing the simulation results obtained by the proposed method with those obtained by the well known mathematical methods, a good agreement between these results is obtained. The comparison validates the effectiveness of the proposed technique.


El Rube I.A.,AAST | El Nasr M.A.,AAST | Naim M.M.,AAST | Farouk M.,AAST
World Academy of Science, Engineering and Technology | Year: 2011

In this paper, a watermarking algorithm that uses the wavelet transform with Multiple Description Coding (MDC) and Quantization Index Modulation (QIM) concepts is introduced. Also, the paper investigates the role of Contourlet Transform (CT) versus Wavelet Transform (WT) in providing robust image watermarking. Two measures are utilized in the comparison between the wavelet-based and the contourlet-based methods; Peak Signal to Noise Ratio (PSNR) and Normalized Cross-Correlation (NCC). Experimental results reveal that the introduced algorithm is robust against different attacks and has good results compared to the contourlet-based algorithm.

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