This thesis would not have been possible without the support and encouragement
of many people. I would like to express the deepest appreciation to my adviser, Dr.
Chanchai Bunchapattanasakda, who improved my several revisions. With his enthusiasm,
his encouragement, and his great efforts to explain things clearly and simply, he helped
me pass the difficult times and clarify of confusion. Throughout my thesis-writing period,
he provided guidance, persistent help, good teaching, and plenty of good ideas which not
only useful in paper but also in lifelong.
I was grateful particular to Assistant Professor Dr. John Walsh, under whose
supervision the topic of this thesis would be noted. He had the attitude and the substance
of a genius with various points of view. I would also like to thank Assistant Professor Dr.
Pacapol Anurit who had taught me research methods. Their advices and comments during
the implementation process assisted me to complete this study.
It was a pleasure to thank Shinawatra University Graduate Program for awarding
me a full tuition fee scholarship, and providing me with the financial supporting to
complete this thesis. I also wished to thank the university staffs, Ms. Ratana
Wattanaverachai and graduate library staffs at Shinawatra university namely Ms. Boonta
Wissawapaisal, Ms. Jiraporn Laothong, and Mr. Weerapon Sripongchai for assisting me
in many different ways. Their kind assistance with thesis format, giving wise advice, and
so on, facilitated me to complete this thesis smoothly.
Lastly, and most importantly, I wished to thank my parents, Mr. Vivat and Ms.
Kunlaya Rattanakitrungrueang for providing a loving environment for me; on whose
constant encouragement and undenying love I had motivation throughout my time at the
entire program.