Andong National University, Andong, Korea, 2002-02-01
Kyungpook National University, Korea, page. 83 - 98, 1997-01-01
Pure Mathemaics Research Council, page. 87 - 110, 1995-09-01
Global Analysis Research Center of Seoul National University, 1993-01-01
Pure Mathematics Research Council, page. 25 - 40, 1992-09-01