I am thankful to Prof. G.R. Shevare, who amidst his busy schedule, spared time to guide me through the project. Without his support, motivation and useful suggestions, this project would not have taken its present shape. I also thank him for the great computing facilities extended and the freedom allowed to me throughout. I also owe my gratitude to Ravi for his continuous help and support during the first stage of the project, and to Avinash for giving me company and keeping me motivated throughout.