Acknowledgements

Thanks are due to my PhD guide Dr N. Yadaiah, Professor and Head, Department of EEE, JNTU Anantapur, for giving me the idea to write this book. I am also indebted to my colleague Dr S. V. Jayaram Kumar, Professor, Department of EEE, College of Engineering, JNTU Hyderabad, for his expert suggestions.

I would not have been able to complete this book if it were not for the cooperation extended by my wife Dr P. V. Naga Prapurna, my mother N. Satyavaty and my daughter N. Divya Sai.

Dr. N. V. Ramana