D. ROY CHOUDHURY is Professor and Head, Computer Engineering Department, Delhi College of Engineering, Delhi. He teaches courses in linear integrated circuits, computers, networks, and control systems both at undergraduate and postgraduate levels. His special interests include control engineering, artificial neural networks, and petri-nets. He received his M.Tech. degree in Radiophysics and Electronics from the Institute of Radiophysics and Electronics, University of Calcutta, in 1966 and Ph.D. from the same university in 1971. From 1971 to 1973, he was associated with the Institute de Reglage Automatique EPFL, Switzerland. He has been with the Delhi College of Engineering since 1974 where he also served in the faculty of Electrical Engineering. Dr. Roy Choudhury is also the author of two other books titled Networks and Systems and Linear Integrated Circuits.