**Editorial Works & Organizing**

- Academic organizing committee, 2-nd Congress ISSAC, Fukuoka Institute of Technology, Fukuoka, Japan, 1999.
- Editor, Communications of the Korean Mathematical Society (2001-2003).
- Chair Organizer, Satellite Conference of the International Congress of Mathematics, 2002 ”Infinite Dimensional Function Theory”, POSTECH, Korea, August 12-16, 2002.
- Special Editor of Journal of the Korean Mathematical Society, Volume 41, Number 1, 2004 (Proceeding of the Satellite Conference of the International Congress of Mathematics, 2002 ”Infinite Dimensional Function Theory”, POSTECH, Korea, August 12-16, 2002).
- Local Organizing Committee, The 16TH International Conference on Finite or Infinite Dimensional Complex Analysis and Applications, Dongguk University, Gyeongju, Korea, July 28-August 1, 2008.
- Chief Organizer, The 1st ILJU School of Mathematics-Banach Spaces and Related Topics, Yong Pyong Resort, Korea, August 19-24, 2009.
- Session Organizer, Functional Analysis Valencia 2010, University of Valencia, Valencia, Spain, June 7-11, 2010.
- Chief Organizer, The 3rd ILJU School of Mathematics-Banach Spaces and Related Topics, Gyeongju, Korea, January 17-21, 2011.
- Chief Organizer, The 5th ILJU School of Mathematics-Banach Spaces and Related Topics, Gyeongju, Korea, January , 2012.
- Chief Organizer, The 7th ILJU School of Mathematics-Banach Spaces and Related Topics, Gyeongju, Korea, January , 2013.
- Chief Organizer, The 8th ILJU School of Mathematics-Banach Spaces and Related Topics, Gyeongju, Korea, January 6-10, 2014.
- Scientific Committee, Function Theory on Infinite Dimensional Spaces XIII, ICMAT, Madrid, Spain, February 4-7, 2014.
- Local Organizing Committee, The 22nd International Conference on Finite or Infinite Dimensional Complex Analysis and Applications, Dongguk University (Gyeongju), Korea, August 8-11, 2014.
- Scientific Committee, The Workshop in Infinite Dimensional Analysis Buenos Aires 2014, Universidad Di Tella, Buenos Aires, Argentina, July 22-25, 2014.
- Chief Organizer, The 9th ILJU School of Mathematics-Banach Spaces and Realted Topics, POSTECH, Pohang, Korea, February 2-7, 2015.
- Chief Editor, Journal of Korean Mathematical Society, 2015.01.01-2017.12.31. Editor, Journal of Korean Mathematical Society, 2017.01.01-Present.
- Chief Organizer, The 11th ILJU School of Mathematics-Banach Spaces and Realted Topics, HICO, Gyeongju, Korea, January 18-22, 2016.
- Chief Organizer, The 12th ILJU School of Mathematics-Banach Spaces and Realted Topics, POSTECH, Pohang, Korea, January 5-11, 2017.
- Chief Organizer, The 13th ILJU School of Mathematics-Banach Spaces and Realted Topics, NIMS, Daejeon, Korea, January 26-February 2, 2018.