I would like to acknowledge all those who, through the years, have placed their wellness in my hand. Most certainly I am thankful for the love, guidance and wisdom of my mother and father. And for the unique guidance and contribution offered to me by my beloved Profesor B. A. Damahe, teacher Mr. Nanda and Sai Kumar.
I wish to express my appreciation to all my colleagues whose boundless energy and enthusiasm is the pillar of my success. I must say thanks to my students who still remembers me all these days.
