J. KOREA INFORMATION SCIENCE SOC., vol. 22, 1995-08
BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY, vol. 39, no. 2, page. 277 - 282, 2002-08
International Combinatorics, Geometry and Computer Science Conference CGCS2007, 2007-05-02
대한수학회 전라-제주지부 2008년도 춘계연구발표회, 전남대학교, 2008-06-20
The first joint meeting of American Mathematical Society(AMS) and Chinese Mathematical Society(CMS). Shanghai Mathematical Society (SMS), 2008-12-17
Global KMS International Conference, Invited talk, ICC-Jeju, 2008-10-23
Joint Meeting of the AMS - NZMS 2007, 2007-12-14
FOURTH KOREA-JAPAN WORKSHOP ON ALGEBRA AND COMBINATORICS, 2008-02-01
UKC 2008( US-Korea Conference on science, technology, and entrepreneurship), San Diego, California, 2008-08-17
GRAPH THEORY NOTES OF NEW YORK, vol. 48, page. 33 - 38, 2005-07
The Youngnam Mathematical Society, 2009 Annual conference, Kyungnam University, 2009-07-27
Korea-Hungary Joint Workshops on Combinatorics
대한수학회 2008년도 춘계연구발표회, 계명대학교, 2008-04-26
LUMS(Lahore University Mathematical Science) Second International Conference on Mathematics and its Applications in Information Technology, Lahore University of Management Sciences(LUMS), Pakistan, 2008-03-09
6th Slovenian International Conference on Graph Theory, 2007-06-25
LUMS 2nd International Conference on Mathematics and its Applications, 2008-03-10
BULLETIN OF THE KOREAN MATHEMATICAL SOCIETY, vol. 25, no. 1, 1988-04