ACKNOWLEDGMENT I would like to articulate our deep gratitude to my thesis guide Asst. Prof. Sunil Maaker who has always been my motivation for carrying out the paperwork. I express my deep sense of gratitude to Dr. Sudesh Kumar, Professor and Head of Computer Science and Engineering Department of BRCM College of Engineering and Technology, Bahal, Haryana for providing the necessary facilities during the research and encouragement from time to time. Special thanks to the institute, BRCM College of Engineering and Technology, for giving me such a nice opportunity to work in the great environment. Thanks to my friend and colleague who have been a source of inspiration and motivation that helped me during my dissertation period. And to all other people who directly or indirectly supported and help me to fulfill my task. Finally, I heartily appreciate my family members for their motivation, love and support in my goal.