Sabah M. Ahmed

Work place: Department of Electrical and Electronic Engineering, Assiut University, Assiut, Egypt



Research Interests: Computer Architecture and Organization, Data Structures and Algorithms, Analysis of Algorithms, Randomized Algorithms


Prof. Sabah M. Ahmed received her B.S.E.E. and M.S.E.E degrees in electrical engineering in 1979 (excellent with honors) and 1983 respectively, both from Assiut University, Egypt. In 1992, she received Ph. D. degree from the Technical University of Budapest, Hungary. Her research interests include speech processing, biomedical and genomic signal processing, data compression, wavelet-transforms, genetic algorithms, and immune algorithms. She has published more than 56 papers in national and international journals and conferences in the above fields. Professor Sabah is currently a Professor of Electronics and Communication Engineering, since Feb. 2009. Also, she is the director of Faculty of Engineering ICDL center, Assiut University and the manager of Assiut University communication and information technology training center.

Author Articles
A New EEG Acquisition Protocol for Biometric Identification Using Eye Blinking Signals

By Mohammed Abo-Zahhad Abo-Zeid Sabah M. Ahmed Sherif N. Abbas

DOI:, Pub. Date: 8 May 2015

In this paper, a new acquisition protocol is adopted for identifying individuals from electroencephalogram signals based on eye blinking waveforms. For this purpose, a database of 10 subjects is collected using Neurosky Mindwave headset. Then, the eye blinking signal is extracted from brain wave recordings and used for the identification task. The feature extraction stage includes fitting the extracted eye blinks to auto-regressive model. Two algorithms are implemented for auto-regressive modeling namely; Levinson-Durbin and Burg algorithms. Then, discriminant analysis is adopted for classification scheme. Linear and quadratic discriminant functions are tested and compared in this paper. Using Burg algorithm with linear discriminant analysis, the proposed system can identify subjects with best accuracy of 99.8%. The obtained results in this paper confirm that eye blinking waveform carries discriminant information and is therefore appropriate as a basis for person identification methods.

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Integrated Model of DNA Sequence Numerical Representation and Artificial Neural Network for Human Donor and Acceptor Sites Prediction

By Mohammed Abo-Zahhad Abo-Zeid Sabah M. Ahmed Shimaa A. Abd-Elrahman

DOI:, Pub. Date: 8 Jul. 2014

Human Genome Project has led to a huge inflow of genomic data. After the completion of human genome sequencing, more and more effort is being put into identification of splicing sites of exons and introns (donor and acceptor sites). These invite bioinformatics to analysis the genome sequences and identify the location of exon and intron boundaries or in other words prediction of splicing sites. Prediction of splice sites in genic regions of DNA sequence is one of the most challenging aspects of gene structure recognition. Over the last two decades, artificial neural networks gradually became one of the essential tools in bioinformatics. In this paper artificial neural networks with different numerical mapping techniques have been employed for building integrated model for splice site prediction in genes. An artificial neural network is trained and then used to find splice sites in human genes. A comparison between different mapping methods using trained neural network in terms of their precision in prediction of donor and acceptor sites will be presented in this paper. Training and measuring performance of neural network are carried out using sequences of the human genome (GRch37/hg19- chr21). Simulation results indicate that using Electron-Ion Interaction Potential numerical mapping method with neural network yields to the best performance in prediction.

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A Novel Circular Mapping Technique for Spectral Classification of Exons and Introns in Human DNA Sequences

By Mohammed Abo-Zahhad Abo-Zeid Sabah M. Ahmed Shimaa A. Abd-Elrahman

DOI:, Pub. Date: 8 Mar. 2014

Signals that represent information may be classified into two forms: numeric and symbolic. Symbolic signals such as DNA symbolic sequences cannot be directly processed with digital signal processing (DSP) techniques. The only way to apply DSP in genomic field is the mapping of DNA symbolic sequences to numerical sequences. Hence, biological properties are reflected in a numerical domain. This opens a field to present a set of tools for solving genomic problems. In literature many techniques have been developed for numerical representation of DNA sequences. The main drawback of these techniques is that each nucleotide is represented by a numerical value depending on nucleotide type only ignoring its position in codon and DNA sequence. In this paper a new approach for DNA symbolic to numeric representation called Circular Mapping (CM) is introduced. It’s based on graphical representation of DNA sequence that maps each nucleotide by a complex numerical value depending not only on nucleotide type but also on its position in codons. The main applications of this method are the gene prediction that aims to locate the protein-coding regions and the classification of exons and introns in DNA sequences. The proposed approach showed significant improvement in exons and introns classification as compared with the existing techniques. The efficiency of this method in classification depends on the right choice of the mapping angle (θ) as indicated by the power spectral analysis results over the sequences of the human genome (GRch37/hg19).

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Genomic Analysis and Classification of Exon and Intron Sequences Using DNA Numerical Mapping Techniques

By Mohammed Abo-Zahhad Abo-Zeid Sabah M. Ahmed Shimaa A. Abd-Elrahman

DOI:, Pub. Date: 8 Jul. 2012

Using digital signal processing in genomic field is a key of solving most problems in this area such as prediction of gene locations in a genomic sequence and identifying the defect regions in DNA sequence. It is found that, using DSP is possible only if the symbol sequences are mapped into numbers. In literature many techniques have been developed for numerical representation of DNA sequences. They can be classified into two types, Fixed Mapping (FM) and Physico Chemical Property Based Mapping (PCPBM (. The open question is that, which one of these numerical representation techniques is to be used? The answer to this question needs understanding these numerical representations considering the fact that each mapping depends on a particular application. This paper explains this answer and introduces comparison between these techniques in terms of their precision in exon and intron classification. Simulations are carried out using short sequences of the human genome (GRch37/hg19). The final results indicate that the classification performance is a function of the numerical representation method.

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