- 1999, Office of Academic Affairs, PNU.

- 1999, Research Institute of Information and Communation, PNU.

- 1998, GL Marketing-Consulting Inc.

- 1998, Office of Academic Affairs, PNU.

- 1996-1997, Interpretation of Results of a Principal Component Analysis, Korea Science and Engineering Foundation (Post-Doctor in University of Aberdeen in England(Scotland)).

- 1995, Research Institute for Basic Science, PNU.

- 1994, DaeWoo Foundation.

- 1994, Dong Nam Bank.

- 1993, Ministry of Education.