Chonchanok Viravan

1Victor Sehgal
1Shirley Shrum
1Michael Beaven
1Chad Piatak
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ii I dedicate this thesis to my parent, Chuchit and Ueychai Viravan. It is my tribute to their constant sacriice, concern, encouragement, discipline, and love. iii ACKNOWLEDGMENTS I o w e m y deepest gratitude to my advisor, Dr. Eugene H. Spaaord, for his eeorts in training me to be a researcher. I wish to thank him for being patient with my mistakes, for(More)
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