-My appreciation and thanks go to the members of the team AND (Algorithms and Distributed Digital) for the warm and friendly atmosphere in which he allowed me to work. So thank you to Jacques Bahi, Pierre-Cyrille HEAM, Huu Quan Do, Bassam Alkindy, Abdallah Makhoul, Huda AL-NAYYEF, Jean-Claude Charr, Jean-François Couchot, Ahmed Mostefaoui, Ahmed Fanfakh, Yousra Ahmed Fadil, Stéphane Domas, Pierre SAENGER, Zeinab FAWAZ, Arnaud Giersch, Christophe Guyeux, Mourad Hakem, David LAIYMANI, Gilles PERROT, Christian Salim, Bashar AL-NUAIMI, Santiago Costarelli, Carol Habib, Hassan MOUSTAFA HARB, and Ke Du. I would like to express my thanks and my best wishes to Ingrid Couturier for all the received assistance during my study. I would also like to express my thanks to Dr. Lilia Ziane Khodja, PostDoc at $LTAS-A\&M$, Liege, Belgium. I would like to thank Béatrice Domenge and Maxim Moureaux in the Reprographie service for all received assistance during my study. I would also like to thank Patricia Py in the Computer Department secretary. I dare not risk missing to mention anyone’s name, so I will simply say 'thank you ALL for being there for me'.
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-Last but not the least, I would like to extend a warm appreciation to those families and friends who have been encouraging along the way.
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