Mehmed Kantardzic and Dr. Ibrahim Imam for all their supports during my M.S. degree. Last but not the least, I would like to thank my family and friends for their love and attentions. Special thanks to my parents, Moones and Cyruse, my lovely sister and brother-in-law, Anahita and Kamran and my little princess Artemis, and my beloved brothers, Arash and Arman, who gave me their unconditional support, love and encouragement through all this process. I will be grateful forever for their love.