I also cannot appreciate enough of the committee members of my thesis, Dr. Kwanghee Won, Dr. Yi Liu, and my graduate faculty representative, Dr. Lan Xu for their help on my thesis in the final defense. Due to their contributions, I was able to improve the quality of my thesis deeply and rationally. I would also like to thank the senior CCT Lab members, and I will never forget the days we studied together in the lab. Finally, I cannot express enough appreciation towards my family members for their invaluable support for me. Without their help, I was not able to continue my academic career.