First of all, I am thankful to God for his blessings and showing me the right direction. With His mercy, it has been made possible for me to reach so far. Foremost, I would like to express my sincere gratitude to my advisor Prof. Durga Prasad Mohapatra for the continuous support of my M.Tech study and research, for his patience, motivation, enthusiasm, and immense knowledge. I am thankful for her continual support, encouragement, and invaluable suggestion. His guidance helped me in all the time of research and writing of this thesis. I could not have imagined having a better advisor and mentor for my M.Tech study. Besides my advisor, I extend my thanks to our HOD, Prof. S. K. Rath and Prof. B. D. Sahoo for their valuable advices and encouragement. I express my gratitude to all the sta members of Computer Science and Engineering Department for providing me all the facilities required for the completion of my thesis work. I would like to say thanks to all my friends especially Dilip Kumar, Alok Pandey for their support. Last but not the least I am highly grateful to all my family members for their inspiration and ever encouraging moral support, which enables me to purse my studies
