It would have not been possible for me to finish the Ph.D. program without the ongoing support of my committee members, family, co-workers, and friends. First and foremost, and I wish to express my sincere gratitude to Dr. Robert Bosselman and Dr. Rebecca (Liang) Tang who supervised my Doctorate, for their intellectual support, encouragement and scientific insight throughout my academic study. I hope to emulate their work ethic and dedication to the academic discipline in my own professional life. I also wish to thank all of my committee members, Dr. Russell Laczniak, Dr. Stephen Sapp, and Dr. Eric Olson, for their valuable time and remarkable insights. They encouraged me in my work, provided me with many details and tireless advice in the completion of my dissertation, and my academic development as well. Finally, I would like to dedicate this dissertation to my wonderful, loving family: my father, my mother, my brothers, Hana & Boram, my sister-in-law, Sunyoung, and my only niece, Sunha. As always, my family has been there for me, providing all sorts of tangible and intangible support. Their underlying unconditional love and support provided a foundation during my collegiate career and beyond. I want to especially mention my father who is in heaven now. My father passed away while I was working on my Ph.D., and it was a difficult time. I would not have been able to complete my Ph.D. without my family's emotional support. My parents have assisted me in innumerable ways; whatever I might say here cannot do full justice to the extent and the value of their contributions. Last, a very special acknowledgement to my life partner, Bryan Cheng, for his love, care, and sacrifice through my journey. Thanks to all.