VISITING POSITION

1

Assistant Professor, Cornell University, USA., Aug 91 - May 92

2

Visiting Scientist, Lund University, Sweden.,  Oct 14 - Nov 10 (1992)

3

Visiting Scholar, Brock University, Canada., July 10 - Aug 16 (1994)

4

Associate Professor, University of New Mexico, USA., Aug 96 - May 97

5

Visiting Scientist , Technion, Israel., April 29 - May 16(1999)

6

Visiting Scientist , Brock University, Canada., May 01 - May 30 (2000)

7

Visiting Scientist, University of Bergamo, Italy., June 03 - July 03 (2001)

8

Visiting Scientist , University of New South Wales, Sydney, Australia

July 16 - July 31 (2003)

9

Visiting Research Professor, University of Oregon, USA., Sept 15 2003 -         March 15 2004

10

Visiting Professor, Hausdorff Institute for Mathematics, Bonn, Germany Aug. 1 - Aug. 31, 2007