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%DEDICATION 

I dedicate this dissertation to my beloved wife Zainb Al-Saadi, my children: Worood, Zahraa, Ahmed, and Jana.  My family, your unwavering support, encouragement, and constant love throughout this Ph.D. study was incredible. My wife and children have supported me with prayers, encouraging words that gave me strength to make this dream a reality. I am truly thankful to my God for having you in my life. I love you.

This dissertation has  also been  dedicated to my parents.  From an early age, they instilled in me a desire to learn, and made sacrifices so as to I have access to a high-quality education. Without their support and guidance, I would not be where I am today. Dear Mom and Dad, I can not thank you enough for all the support and love you have given me. I know you would have been very proud of me. Thank you so much for your love.  

I dedicate this work as well to my brothers, sisters, and their families, whose support and encouragement helped me to follow through and not give up. 

Last but most certainly not least, I would like to extend my dedication to my friends who supported me and kept me focused with their words, actions, and prayers throughout my journey. 
