Acknowledgement
Sherif Aly Ahmed Sakr
Ph.D.
Candidate
University of Konstanz (Germany)
I have to thank my God for
what he gave me all over my life and what he will give for the rest
of it. Thanks my merciful God.
My deep thank to my father, Mr. Ali Ahmed SaKr
And the whole of my family for being patient with me and the
great support and encouragement they gave to me in the whole of my
life. My deepest gratitude,
sincere appreciation and highest esteem to all persons supporting me
in building my educational background and my career in the computer
science filed:
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