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DAVID A. RENNELS, Associate Professor

UCLA Computer Science Department
4731G Boelter Hall
Los Angeles, CA 90095-1596
tel: (310) 825-1484, fax: (310) 825-2273



Dr. Rennels received the B.S.E.E. degree from Rose Hulman Institute of Technology in 1964, the M.S.E.E. from Caltech in 1965, and the Ph.D. in Computer Science from UCLA in 1973. He is principal investigator of research projects in fault-tolerant computing sponsored by the Aerospace Corporation, NSF, ONR, Hughes Aircraft, and TRW. He has also been responsible for the design and experimental validation of several fault-tolerant computers at the Jet Propulsion Laboratory. Dr. Rennels was the general chairman of the 12th International Symposium on Fault-Tolerant Computing in 1982. He is a member of the IFIP Working Group 10.4 on Reliable Computing and Fault-Tolerance, and was chairman of the IEEE Computer Society Technical Committee on Fault-Tolerant Computing in 1988 and 1989. His research interests are computer architecture and fault tolerant computing.

Professor Rennels is currently the Vice-Chair of Undergraduate Affairs for the Computer Science Department.


1. D. W. Caldwell and D. A. Rennels, "Minimalist Recovery techniques for Single Event Effects in Spaceborne Microcontrollers,"
    Seventh IFIP International Working Conference on Dependable Computing for Critical Applications, DCCA7, San Jose, CA,
    January 6-8, 1999.  BEWARE: IEEE Copyrighted Material

2.  D. A. Rennels, Fault-Tolerant Computing,  Encyclopedia of Computer Science, ed., Anthony Ralston,
     Edwin Reilly, and  David Hemmendinger, To appear 1999 (International Thomson Publishing -- Europe)

3.  D.W. Caldwell and D. A. Rennels, "FTSM: A Fault-Tolerant Spaceborne Microcontroller", Fastabstracts, 28th International
     Symposium on Fault-Tolerant Computing,  FTCS28, Munich, June 1998.
     .ps-version    BEWARE: IEEE Copyrighted Material

4.  David A. Rennels, D. W. Caldwell, R. Hwang, and M. Mesarina, "A Fault-Tolerant Embedded Microcontroller Testbed."
     1997 Pacific Rim International Symposium on Fault Tolerant Systems (PRFTS97) Taipei, December 15-16, 1997
     .ps-version    BEWARE: IEEE Copyrighted Material

5.  D. W. Caldwell, D. A. Rennels, "A Minimalist Hardware Architecture for Using Commercial Microcontrollers in Space,"
     16th Digital Avionics System Conference, Newport Beach, CA, October 28-30, 1997.            .ps version

6.  R. Panwar and D. Rennels, "Input Ordering for Low Power in CMOS Logic Gates." Int. J. Electronics, 1995,  Vol:78, No. 5, 925-943.

7.  R. Panwar and D. Rennels, "Reducing the Frequency of Tag Compares for Low-Power I-Cache Design," Proc. 1995 Int. Symp
     on Low Power Design, Dana Point, CA, April, 1995, pp. 57-62.

8.  D. Rennels and Hyeongil Kim, "Concurrent Error Detection in Self-Timed VLSI," Proc. 24th International
     Symposium on Fault-Tolerant Computing (FTCS24) Austin TX, June 1994. .ps version  BEWARE: IEEE Copyrighted Material

9.  Panwar, R., L. Alkalaj, and D. Rennels, "Mixed Voltage VLSI  Design," Proc. 5th NASA Symposium on VLSI Design, Albuquerque,
     NM, Nov.4-5, 1993, pp. 6.4.1-6.12.

10.  Panwar, R., L. Alkalaj, and D. Rennels, "Power Optimization in Logic Isomers,"  Proc. 5th NASA Symposium on VLSI Design,
     Albuquerque, NM, Nov.4-5, 1993, pp. 6.1.1-6.1.11.

11. Rennels, D. and H. Kim, "VLSI Implementation of a Self-checking Self-exercising Memory System,"  Proc. 21st Int. Symp.
      Fault-Tolerant  Computing, Montreal, June 25-27, 1991, pp. 170-177.

12. Lee, D., J. Abraham, D. Rennels, and G. Gilley, "A Numerical Technique for the Hierarchical Evaluation of Large Closed
      Fault-Tolerant Systems,"  Proc. Second IFIP Working Conf. on Dependable Computing for Critical Applications,
     Tucson, Ariz., Feb. 18-20, 1991.


1. Ju, David, "Software for a Fault-Tolerant Microcontroller Network," Masters Thesis, UCLA Computer Science Dept, June 1999

2.  Mike Loving and David Rennels, "A Two-Level technique for Modeling Fault-Tolerant Systems," UCLA Computer Science
     Department Technical Report TR-980024, May 1998.          .ps version

3.  Douglas Caldwell and David Rennels, "Minimalist Fault Masking, Detection and Recovery Techniques for Mitigating Single
     Event Effects in Spaceborne Microcontrollers", UCLA Computer Science Department Technical Report TR-980025, May 1998.
     .ps version

4.  Rennels, D. and Loving M., "Stochastic Petri Net Modeling of Fault-Tolerant Multicomputers,"  UCLA Computer Science Dept.
     Technical Report CSD-930008, University of California, Los Angeles, CA 90024, March 1993.

Ph.D. Dissertations

1. Douglas W. Caldwell,  "Minimalist Fault-Tolerance Techniques for Mitigating Single-Event Effects in Non-Radiation-
 Hardened, Microcontrollers",  UCLA Computer Science Department, 1998.


May 1998 Progress Report "An Experimental Study of Heterogeneous Fault-Tolerant Systems" prepared for the
Office of Naval Research      .pdf version,    Powerpoint 4 version.         Copyright 1998 by David A. Rennels

Interesting Concerts

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