| Hanyang University, ERICA Campus, Korea |
| ● Dean, College of Computing |
Jan. 2021 - Dec. 2022 |
| ● Chair, Board of Computer Education |
Mar. 2006 - Feb. 2010 |
| ● Head, Dept. of Computer Science and Engineering |
Aug. 2006 - Jul. 2007 |
| ● Head, Dept. of Computer Science and Engineering |
Mar. 1999 - Feb. 2001 |
| ● Vice Chair, Board of Computer Education |
May. 2000 - Feb. 2002 |
| ● Manager, Information and Communications Center |
Sep. 1997 - Aug. 2000 |
| ● Member, Board of Computer Education |
Nov. 1996 - Apr. 2000 |
| Korea Institute of Information Security & Cryptology, Seoul, Korea |
| ● President Emeritus |
Jan. 2015 - Present |
| ● President |
Jan. 2014 - Dec. 2014 |
| ● Senior Executive Vice President |
Jan. 2013 - Dec. 2013 |
| ● Vice President of Planning |
Jan. 2010 - Dec. 2012 |
| ● Vice President of General Affairs |
Jan. 2009 - Dec. 2009 |
| ● Director of Finance |
Jan. 2008 - Dec. 2008 |
| ● Director of General Affairs |
Jan. 2007 - Dec. 2007 |
| ● Editor-in-Chief, Journal of KIISC |
Jan. 2004 - Dec. 2005 |
| ● Member of Editorial Board, Journal of KIISC |
Jan. 2002 - Dec. 2003 |
| ● Director of Public Relations |
Jan. 1999 - Dec. 2006 |
| Korea Information Processing Society, Seoul, Korea |
| ● Vice President of Finance |
Jan. 2013 - Dec. 2013 |
| ● Vice President of Publicity |
Jan. 2010 - Dec. 2012 |
| ● Director of Public Relations |
Jan. 2009 - Dec. 2009 |
| ● Director of General Affairs |
Jan. 2008 - Dec. 2008 |
| ● Editor-in-Chief, Journal of KIPS C |
Jan. 2007 - Dec. 2008 |
| ● Member of Editorial Board, Journal of KIPS C |
Jan. 2005 - Dec. 2006 |
| ● Member of Editorial Board, J. of Information Processing Systems |
Jan. 2007 - Dec. 2009 |
| Supreme Prosecutors' Office of the Republic of Korea, Seoul, Korea |
| ● Vice Chair, Advisory Committee for Digital Investigation |
May. 2007 - Aug. 2019 |
| Korea Communications Commission, Seoul, Korea |
| ● Member of Advisory Committee for Internet Security |
Nov. 2006 - Dec. 2013 |
| Korea Internet & Security Agency, Seoul, Korea |
| ● Member of ISMS-P Accreditation Board |
Jul. 2015 - Present |
| ● Member of Editorial Board, Internet and Information Security |
Mar. 2010 - Feb. 2012 |
| ● Member of Advisory Committee for VoIP Security |
Nov. 2007 - Dec. 2009 |
| Gyeonggi Provincial Assembly, Suwon, Korea |
| ● Member of Informatization Committee |
Sept. 2012 - Jun. 2014 |
| Ministry of Government Administration and Home Affairs, Seoul, Korea |
| ● Member of Advisory Committee on Government Policy |
Dec. 2014 - Feb. 2016 |
| National Research Foundation of Korea, Daejeon, Korea |
| ● Member of Review Board |
Oct. 2018 - Oct. 2021 |
| Dept. of Electrical and Computer Engineering, Iowa State University |
| ● Visiting Scholar |
Mar. 2011 - Feb. 2012 |
| IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing |
| ● Member of Program Committee |
2017 |
| International Conference on Information Security and Cryptology |
| ● Member of Program Committee |
2010 - 2013 |
| ● Chair, Organizing Committee |
2006 |
| Workshop on Information Security Applications |
| ● Member of Program Committee |
2007 |
| Asia Joint Conference on Information Security |
| Joint Workshop on Information Security |
| ● Member of Program Committee |
2006 - 2013 |
| Annual International Symposium on Applications and the Internet |
| ● Member of Program Committee |
2010 |
| International Workshop on Intelligent, Mobile and Internet Services in Ubiquitous Computing |
| ● Member of Program Committee |
2009 |
| International Workshop on Next Generation Security |
| ● Member of International Advisory Committee |
2009 |
| International Conference on Hybrid Information Technology |
| ● Member of Program Committee |
2006 |
