\chapter*{ACKNOWLEDGEMENT}
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First and foremost, I express my deep gratitude to \textbf{God Almighty} for granting me the strength, wisdom, and perseverance to pursue and complete this doctoral research. I also express my heartfelt gratitude to our esteemed Founder, the Late \textbf{Dr.~D.~G.~S. Dhinakaran}, and my sincere thanks to \textbf{Dr.~Paul Dhinakaran}, Founder and Chancellor; \textbf{Dr.~R. Elijah Blessing}, Vice Chancellor; \textbf{Dr.~S.~J. Vijay}, Registrar; \textbf{Dr.~C. Joseph Kennady}, Dean of Sciences, Arts \& Media; \textbf{Dr.~B. Jefferson Raja Bose}, Controller of Examinations; \textbf{Dr.~K.~R.~S. Krishnan}, Director (Research \& Consultancy); and \textbf{Dr.~S. Thomas George}, Deputy Director (Academic Research), Karunya Institute of Technology and Sciences, for their continued support and for providing the necessary facilities to complete this research.

I express my profound gratitude to my Supervisor, \textbf{Dr.~\SupervisorName}, \SupervisorDesignation, \SupervisorDivision, \SupervisorInstitution, for his invaluable guidance, constant encouragement, and insightful suggestions throughout the course of this research. His academic rigor, constructive criticism, and unwavering support have significantly shaped the direction and quality of this work. I am deeply indebted to him for his patience and mentorship at every stage of this doctoral journey.

I also extend my sincere thanks to my Joint-Supervisor, \textbf{Dr.~\CoSupervisorName}, \CoSupervisorDesignation, \CoSupervisorDivision, \CoSupervisorInstitution, for his valuable inputs, thoughtful discussions, and continued support during the course of this research work.

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I gratefully acknowledge the financial support received from the funding agency (if any), which made this research possible. I sincerely thank the members of my research group and laboratory colleagues for their valuable discussions, constructive feedback, and collaborative spirit that enriched this work. I also extend my appreciation to the technical and administrative staff of the Division for their timely assistance and support in facilitating experimental and institutional requirements. Finally, I owe my deepest gratitude to my family for their unwavering encouragement, patience, and moral support throughout this academic journey, without which the completion of this research would not have been possible.

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