research positions
Visiting Professor, School of Cognitive Science, Jadavpur University, Kolkata, 2008 – till date (https://sites.google.com/site/schoolnewsite/home)
Honorary Visiting Professor, Center for Soft Computing Research, Indian Statistical Institute, Kolkata, 2010-2013 (http://www.isical.ac.in/~scc/)
Visiting Researcher, Universidade Federal do Rio Grande do Norte, Natal, Brazil, April 8-15, 2013 (http://en.wikipedia.org/wiki/Federal_University_of_Rio_Grande_do_Norte)
Visiting Professor, Institute of Logic and Cognition, Sun Yat-Sen University, Guangzhou, China, May, 2011 and 2008 (http://logic.sysu.edu.cn/english/Index.asp)
Visiting Professor, IRIT Univ. Paul Sabatier, Toulouse, France, June, 2009 (http://www.irit.fr/?lang=en)
Visiting Professor, University of Helsinki, Finland, Oct., 2008 (http://www.helsinki.fi/university/)
Visiting Professor, Univ. Delgi Studi di Milano, Italy, Sept., 2008 (http://www.unimi.it/ENG/)
Visiting Professor, University of Wollongong, Australia: School of Mathematics and Statistics, Oct.-Nov., 2003 and Dept. of Information Systems, Oct.-Nov., 2004 (http://www.uow.edu.au/index.html)
Visiting Researcher, LIPN, Institute Galille, Dept. of Informatics, University of Paris XIII, France, May-June, 2000 and June-July, 1995
Visiting Researcher, Institute of Mathematical Sciences, Chennai, Oct.-Nov., 1999 (https://www.imsc.res.in/)
Visiting Fellow, Visva-Bharati University, West Bengal, March-November, 1997 (http://www.visvabharati.ac.in/)
Visiting Researcher, Depts. of Mathematics, University of Salerno and University of Naples, Italy, March, 1996 (http://www.unisa.it/english/index, http://www.international.unina.it/)
Visiting Researcher, Institute of Mathematics, University of Warsaw, Poland, April-June, 1995 (http://en.wikipedia.org/wiki/University_of_Warsaw)
Exchange Visitor, Polish Academy of Science (under Exchange Programme of INSA), March-June, 1989 (http://www.english.pan.pl/)
DAAD Fellow, RWTH Aachen, Germany, September-November, 1986
Fellow, Indian Institute of Advanced Studies, Shimla, March-June, 1986
Visiting Researcher, Dept. of Mathematics & Statistics, University of Regina, Canada, March-June, 1985 (http://www.uregina.ca/)