Add to ORKGFirst and foremost, I would like to express my sincere gratitude towards Dr. Yonghe Liu for giving me priceless guidance and invigoration. Without his patience and continuous help this thesis would not have been completed. I am extremely thankful to the members of my thesis committee. I give deep appreciation to Dr. Sajal Das for serving the best environment for my research. I thank from the bottom of my heart to Dr. Ramesh Yerraballi for donating his precious time to ameliorate my thesis. Words are insufficient express my best appreciation to my father and mother for their unqualified love and great support. Also I am very thankful to my brother for his encouragement and assistance. I would like to give my best love and thank to my wife an...