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First, I would like to thank my advisor Dr. Rashid Ansari, for his continuous support and guidance throughout my research and writing of this thesis.  
His feedback and hard questions during the dissertation writing helped me to widen my research perspectives.  

I would also like to thank my committee members Dr. Ahmet Enis Cetin and Dr. Mojtaba Soltanalian for their insightful comments and reviewing my work.

Thanks to all of my lab-mates, especially Lubna for all of the fun we have in the last two years. 

Thanks to my parents Md. Muhiuddin Khan, Khaleda Khan, without whose love and support I could never have made it this far. 
Thanks to my brother Khaled Hasan Khan for supporting me throughout this long journey and my life in general.

Last but not least, thanks to my husband Musa for his continuous support and encouragement. This accomplishment would not have been possible without him.







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