\chapter*{Acknowledgment}
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$4^{th}$ October, 1996
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I would like to take this opportunity to express my gratitude
 to my guide, \\{\bf Dr.\ S. Gopalsamy}, for his tolerance, and for the
valuable time he took out of his
busy schedule to guide me throughout this training. 
I would also like to thank Dinesh Shikhare and Deepraj Dixit for their 
invaluable support and suggestions. I also owe my gratitude to Prof.\ G. R.
Shevare, Aerospace Engg. Dept., IIT-Bombay, who made this practical
training possible.

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Anirudh Modi
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