Mustafa Abdallah

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In this paper, we introduce an enhancement for speech recognition systems using an unsupervised speaker clustering technique. The proposed technique is mainly based on I-vectors and Self-Organizing Map Neural Network (SOM). The input to the proposed algorithm is a set of speech utterances. For each utterance, we extract 100-dimensional I-vector and then SOM(More)
In this paper we use an artificial immune optimization algorithm in conjunction with the universal generating function (UGF) to solve the preventive maintenance (PM) problem for multi-state series-parallel system. In this work, we consider the situation where system and its components have several ranges of performance levels. Such systems are called(More)
  • M. Abdallah
  • 2012
Convex optimization techniques are widely used in the design and analysis of variety of problems especially in communications and signal processing. Many communication problems can either be defined as or be converted into convex optimization problems. Convex optimization makes the analysis and numerical solutions much easier. In this paper, a convex(More)
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