ACKNOWLEDGMENTS The process of earning my master' s has been a lengthy process, in which many people have offered invaluable assistance. I would like to thank my advisor Dr. Won Suk 'Daniel' Lee, who instructed me and always supported me. I am privileged to have collaborated with him on this proj ect. His advice and ideas have been the pillars that have held this work to a higher standard. My appreciation goes to committee members Dr. Thomas F. Burks and Dr. James J. Ferguson for encouragement and guidance to complete this work. I also wish to thank Dr. Kelly T. Morgan and Mr. Jae Hyuk Choi for their assistance during field operations. Thanks go to my parents and family members for their continuous prayers, concern and support. Finally, I would like to thank all of those not explicitly mentioned here who have aided my intellectual and social growth throughout my academic career.