Today, I have successfully passed my defense exmination. At this exciting moment, I would like to deeply appreciate my supervisor---Prof. Jinhyun Choo. My present achievement would have been impossible without the help and support from him. Under Prof. Choo's great supervision, I have learned a lot of qualities for being not only an excellent researcher but also an outstanding man. To me, he is a respectable mentor, a close friend, and a role model that I always admire.
I also want to send my appreciation to three exminers in my Thesis Examination Committee---Prof. Xiaowei Deng, Prof. Ahmed E. Elbanna, and Prof. Richard A. Regueiro, and the chairman---Prof. Kenneth K.Y. Wong, for spending their precious time on my examination.
More importantly, I would like to express my greatest gratitude to my family---my parents and my wife, Natalie. I know wherever I go and whatever I do in the future, they will always be supportive of my decision. I am forever indebted to them.