- Department of Computer Science, I.I.T Madras, June 2005-July 2005.
- Department of Electrical Engineering, Tokyo Institute of Technology, Tokyo, Japan, May 2005.
- Department of Electrical Engineering, Chuo University, Tokyo, Japan, May 2005.
- Department of Computer Science, Tohoku University, Sendai, Japan, May 2005.
- Department of Computer Science, I.I.T Madras, December 2004-January 2005.
- University of North Texas, Denton, October 2004.
- School of Engineering, University of California, Santa Cruz, USA, November 2003.
- Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, Canada, March 2002.
- Department of Electrical and Communication Engineering, Tokyo Institute of Technology, June 2001.
- Department of Information Engineering, Niigata University, Japan, May 2001.
- Department of Computer Science, Aizu University, June 2001.
- Department of Electrical Engineering, Chuo University, Tokyo, June 2001.
- Department of Electrical Engineering, Kyushu University, June 2001.
- Coordinated Sciences Laboratory, University of Illinois, Urbana-Champaign, November, 2000.
- Nortel Networks, Ottawa, Oct. 1999.
- University of Oklahoma, May 1993.
- Dept. Of Comp. Science, I.I.T., Bombay, July 1992.
- Dept. of Comp. Science, Univ. of Southern Louisiana, March 1992.
- Dept. of Comp. Science, University of Ohio, Athens, May 1991.
- Dept. of Mathematics, Technical Univ. of Berlin, Germany, December 1990.
- GMD, Fokus, Berlin, Germany, December 1990.
- Dept. of Comp. Science, Univ. of Twente, Holland, November 1990.
- Dept. of Comp. Science, Utretcht Univ., Holland, November 1990.
- Dept. of Comp. Science, Univ. of Saarlandes, Saarbrucken, Germany, October 1990.
- Dept. of Comp. Science, Univ. of Paderborn, Paderborn, Germany, October 1990.
- Dept. of Comp. Science, Queen’s Univ., Kingston, Canada, November 1988.
- Dept. of Comp. Science, I.I.T., Bombay, August 1988.
- Dept. of Comp. Science, I.I.T., Madras, August 1988.
- Dept. of Comp. Science, Anna Univ., Madras, August 1988.
- Dept. of Comp. Science, Univ. of Hong Kong, July, 1988.
- Dept. of Applied Mathematics, Hiroshima Univ., Japan, May 1988.
- Dept. of Elect. Engr., Tohoku University, Japan, May 1988.
- Dept. of Elect. Engr., Osaka Univ., Japan, May 1988.
- Dept. of Elect. Engr., Fukui Univ., Japan, April 1988.
- Dept. of Elect. Engr., Nigata Univ., Japan, April 1988.
- South East Asian Conference on Combinatorics, Univ. of Singapore, May 1983.
- Dept. of Elect. Engr., I.I.T., Madras, August 1984.
- Dept. of Comp. Science, Univ. of Toronto, December 1982.
- Dept. of Comp. Science, Clarkson College of Technology, Potsdam, New York, May 1979.
- Dept. of Comp. Science, Univ. of Oklahoma, Norman, Oklahoma, April 1979.
- Dept. of Mathematics, Western Illinois Univ., Macomb, Illinois, March 1979.
- Dept. of Comp. Science, Univ. of Toronto, Ontario, April 1976.
- Dept. of System Design, Waterloo Univ., Ontario, May 1976.
- Dept. of Comp. Science, Indian Institute of Tech., Kanpur, March 1973.
- Dept. of Elect. Engr., Osmania Univ., India, February 1973.
- Dept. of Elect. Engr., Tokyo Institute of Tech., Tokyo, May 1972.
- Dept. of Elect. Engr., Univ. of Tokyo, May 1972.
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