There are many people whom I would like to acknowledge for their help and support. First of all, my heartfelt thanks and appreciation go to my direct supervisor, Dr.John Shepherd, for his guidances, supports, knowledges and insights since my undergraduate degree as well as his insightful editorial skills. I would also like to express very special thanks to Professor Paul Compton for his helpful suggestions, encouragements and supports. I also wish to thank my colleagues and friends in the

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... , Annie, Zhalaing, Akara and Franky. Many thanks to the university and the faculty for providing me the opportunity and financial support to undertake this research. Last but not the least, I thank my family, morn, dad and brothers, who always love me and believe in me, my best friend and partner, Werner, who is always there for me. I love you all! 11