I would like to dedicate this thesis to two special angels: God and my dear parents, without whom I could not have completed this challenging, yet fruitful PhD journey. I have no words to express my gratitude for every single thing my parents have done for my education and for my whole life. I cannot do anything to repay their love, affection, care, and concern for me.I would like to extend my sincere thanks to my husband, all my family members and friends who have supported me in one way or another. First and foremost, I would like to sincerely express my gratitude to my advisor A/Prof Andy W. H. Khong for his continuous support and guidance throughout my Ph.D. journey. His constant motivation and encouragement has transformed me tremendously.His advice has always been a great tonic to boost my morale and confidence level.
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