Acknowledgements
I would like to acknowledge, and give my warmest thanks to my supervisor M. Samir Grimes,
and jury members Mrs. Dahbia Mokhbi-Soukane, Mrs. Amina Boumaour, Mrs. Sonia Akrour,
and M. Abdelkrim Rezal.
I would also like to express my sincere gratitude to my parents, brothers, friends, and all those
who have contributed to this work.