DYNAMIC PUSH AND PULL STRATEGY BASED

It is a pleasure to thank the many people who made this thesis possible. It is difficult to overstate my gratitude to my thesis supervisor, Dr. Yonghe Liu. With his enthusiasm, his inspiration, and his great efforts to explain things clearly and simply, he helped to make thesis fun for me. Throughout my masters ' thesis period, he provided encouragement, sound advice, good teaching, and lots of good ideas. I would have been lost without him. I am indebted to my student colleagues, Jing, Sunil, Samik Ghosh for providing a stimulating and fun environment and also for being really helpful through out my thesis. I am especially grateful to my friend, Praveen Kumar for his support regardless of the matter. I am grateful to my graduate advisor in the department of computer science, Mr. Mike O ’ Dell for assisting me in many different ways. I wish to thank my sister and brother-in-law, Kavita and Prashant for believing in me. Lastly, and most importantly, I wish to thank my parents, Shanti and Ganapathi Mohan. They bore me, raised me, supported me, taught me, and loved me. To them I dedicate this thesis