I would like to acknowledge the most important people in my life; my grandfather, the late Shri. Gopal Chatterjee, my grandmother, the late Smt. Subhankori Chatterjee, my father, Shri. Aloke Moy Chatterjee, my late mother Ms. Nomita Chatterjee, and my uncle Shri. Moni Moy Chatterjee. The book has been my long-cherished dream which would not have been turned into reality without the support and love of these amazing people. They have continuously encouraged me despite my failing to give them the proper time and attention. I am also grateful to my friends, who have encouraged and blessed this work with their unconditional love and patience.

Jyotir Moy Chatterjee
Department of IT
Lord Buddha Education Foundation
(Asia Pacific University of Technology & Innovation)
Kathmandu, Nepal