I want to dedicate this dissertation to my family. My parents, Mahmuda Khatun and MD.Nazrul Islam, whose continuous support, encouragement, and love throughout my life, helped lead me to where I am now. My 4-year-old son, Elan Imir Aziz, has grown up with my dissertation and become the reason to keep me going. My husband, Ahmed Tariq Aziz, pushed me to complete this work. Without all of your support and sacrifices, this work would not be possible.
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