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A very special thanks to Dr. Carlton J. Fong who was with me from the start of the master program. His encouragement, recommendations, creativity, sense of humor, and patience helped me have a strong interest in this area and complete this thesis and my degree. I also thank my parents who have loved and supported me unconditionally. I will always be indebted to them, and I appreciate everything that they have done for me.Without their assistance and support, I would have never finished my thesis. Thank you for all your efforts.

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