Editors

Wolfgang A. Halang, born in 1951, studied Mathematics and Theoretical Physics at Ruhr-Universitaet Bochum, West Germany. He received a doctorate with a thesis on Numerical Analysis in 1976. Subsequently, he studied Computer Science at Universitaet Dortmund concluding with a dissertation on function oriented structures for process control computers. Simultaneously with the latter, he worked with the Coca-Cola GmbH in Essen realizing real-time applications in the chemical Research and Development Department. From 1985 to 1987, he was a professor for Systems Engineering at the King Fahd University of Petroleum & Minerals in Dhahran, Saudi Arabia, teaching courses mainly on real-time and computer control systems. During the academic year 1987/88 he was a visiting (research) professor with the Department of Electrical and Computer Engineering and with the Computer Systems Group at the Coordinated Science Laboratory at the University of Illinois at Urbana-Champaign. From June 1988 to May 1989 he was back in Germany working in the process control division of the Bayer AG chemical company. Since June 1989 he is a full professor at the University of Groningen in the Department of Mathematics and Computing Science. His research interests comprise all major areas of hard-real-time systems with special emphasis on innovative and function oriented architectures and on application specific peripheral components for process control computers. He is a member of various professional organizations and technical committees and involved in the program committees of several conferences.

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John A. Stankovic is associate professor in the Computer and Information Science Department at the University of Massachusetts at Amherst. His current research interests include investigating various approaches to scheduling on local area networks and multiprocessors and developing flexible, distributed, hard-real-time systems. He is currently building a hard-real-time kernel, called Spring, which is based on a new scheduling paradigm and on ensuring predictability. This kernel will support a network of multiprocessors. He is also performing research on a distributed database testbed called CARAT. The CARAT testbed has been operational for several years and includes protocols for realtime transactions. Professor Stankovic has held visiting positions in the Computer Science Department at Carnegie-Mellon University and at INRIA in France. He received an Outstanding Scholar Award from the School of Engineering, University of Massachusetts. He was an IEEE Distinguished Speaker for two years. He serves as an editor for IEEE Transactions on Computers. He has also served as guest editor for a special issue of IEEE Transactions on Computers on parallel and distributed computing, and for IEEE Computer Magazine on Distributed Computing. He has published extensively, including two tutorial texts, Hard-Real-llme Systems and Reliable Distributed System Software. He is a member of ACM, IEEE, and Sigma Xi. He received the B.S. degree in electrical engineering, and the M.S. and Ph.D. degrees in computer science, all from Brown University, in 1970, 1976, and 1979, respectively.

97 Mar|o Tokoro, Associate Professor, Department of Computer Science and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama223 Japan and Director, Sony Computer Science Laboratory Inc., 3-14-13 Higashi Gotanda, Shinagawa-ku, Tokyo 141 Japan. He was born in Tokyo in 1947. He received a B.S. in Electrical Engineering, an M.S. in Administration Engineering, and a Ph.D. in Electrical Engineering from Keio University, Yokohama, Japan in 1970, 1972, and 1975, respectively. He joined the Department of Electrical Engineering, Keio University as assistant professor in 1975. He was visiting assistant professor at the University of Waterloo, from January 1979 to June 1980, and at Carnegie-Mellon University from July to December 1980. His research interests range on a wide spectrum in computer science and engineering, including Programming Languages and Systems, Operating Systems, Distributed Systems and Computer Networks, and Computer Architecture. In particular, his current interests are the notion of Object-Orientation to be used as a unified conceptual base for Programming Languages, Operating Systems, and Architecture with Concurrent, Distributed, Reliable, and Real-Time capability. He is currently directing the Muse Project to build a Distributed Real-TimeReliable Operating System based on Concurrent Objects. He is a co-designer of Orient84/K, a concurrent object-oriented programming language especially tuned for describing distributed Artificial Intelligence problems. He is also known as a co-designer of ConcurlentSmalltalk. He has also worked in Local Area Network area, where he devised a scheme called Acknowledging Ethernet. In addition to these, he has been involved in various research and development projects, such as object-oriented distributed architecture ZOOM, Shared Memory Multiprocessor KMP/II, Microprogram optimization technique MORIF, a module level logic simulator MACSIM, and multiprocessor oriented byte-sliced microprocessor module PM/II. He was given the best paper award from the 15th Design Automation Conference for his paper entitled A Module-Level Simulation Technique for Systems Composed of LSIs and MSIs in 1978. He is currently serving as Track Chairman in Supercomputing, IFIP llth World Congress (IFIP '89) to be held in August-September 1989 in San Francisco. He served as Program Chairman, IFIP WG10.1 Workshop on the Concepts and Characteristics of Knowledge-based Systems in November 1988 at Mt. Fuji; Program Chairman of the 13th International Symposium on Computer Architecture in June 1986 in Tokyo; Co-Program Chairman of the 10th International Symposium on Computer Architecture in June 1983 in Stockholm. He has been on the editorial boards of several transactions and technical journals, including the Information Processing Society of Japan, Japan Society for Software Science and Technology, and Journal of Distributed Computing. He published mole than 50 technical papers, edited a few books including Object-Oriented Concurrent Programming (MIT Press), and authored a few books including Introduction to Computing Systems (Iwanami Publishing Co.).