Activities

• Speaker, The Third National Conference of Vietnamese mathematical Society, Hanoi, Vietnam, June, 1985.

• Speaker, The Fourth National Conference of Vietnamese mathematical Society, Hanoi, Vietnam, June, 1990.

• Speaker, The Minsk Conference on Mathematics, Minsk, June 1992.

• Speaker, The Byelarussian Conference on Mathematics, Grotno, Byelaruss, September 1992.

• Speaker, International Conference “Applied Analysis,” Hanoi, Vietnam, August 26-30,1993.

• Speaker, International conference on Optimization: Techniques and Applications(ICOTA’95), Chengdu, Chine, 5-8 June, 1995.

• Speaker, TIMS 33, June 1995, Singapore.

• Speaker, Second Asian Mathematical Conference (AMC’95), October 1995, Thailand.

• Speaker, The Fifth National Conference of Vietnamese Mathematical Society, Hanoi, Vietnam, September 17 - 20, 1997.

• Speaker, The Vietnam-Japan bilaterial symposium on fuzzy systems and applications (VJFUZZY’98), Ha long Bay, Vietnam, 30th September-2nd October 1998.

• Speaker, The Second National Conference on probability and statistics, Bavi, Hatay, 1- 4 November, 2001.

• Invited Speaker, The Sixth National Conference of Vietnamese Mathematical Society, Hue, Vietnam, September 7 - 10, 2002.

• CIMPA-UNESCO-Philippines School, 4-18 July, 2005, Manille, Philipines • Member of Mathematical Association of Vietnam

• Member of Applied Mathematics Association of Vietnam

• Editorial member of Scientific Bulletin, University of Hue