Professor, Department of Computer Science and Engineering, College of Informatics, Korea University

Mar. 1998. – present.

Visiting Professor, Electrical and Computer Engineering, Univ. of Texas at San Antonio

Sep. 2019. – Aug. 2020.

Associate Dean, College of Informatics, Korea University

Oct. 2014. – Jan. 2019.

Visiting Professor, College of Computing, Virginia Tech.

Mar. 2011. – Feb. 2012.

Asscoate Dean, College of Education, Korea University

Feb. 2010. – 2011. Jan.

Asscoate Dean, College of Education, Korea University

Feb. 2005. – Jan. 2006.

Visiting Professor, College of Computing, Georgia Tech.

Feb. 2004. – Jan. 2005.

Assistant Professor, Department of Computer Engineering, Seokyeong University

Mar. 1995. – Feb. 1998.

Editor, Korean Institute of Information Scientists and Engineers

Jan. 2007. – present

Auditor, The Korean Association of Computer Education

Mar. 2018. – Feb. 2020.

Vice President, Korea Information Processing Society

Jan. 2015. – Dec. 2020.

Vice President, Korean Institute of Information Technology

Jan. 2014. – Dec. 2016.

Vice President, The Korean Association of Computer Education

Mar. 2014. – Feb. 2018.

Director, Korea Information Processing Society

Feb. 2010. – Dec. 2014.

Vice President, The Korean Association of Computer Educationy

Mar. 2006. – Feb. 2010.

Director, The Korean Association of Computer Education

Mar. 2002. – Feb. 2005.

International Conference on Ubiquitous Information Technologies and Applications, International Advisory Committee

2014, 2015, 2016, 2018, 2019

International Conference on Future Computer and Communication, Technical Committee

2016

International Conference on Advanced Information Networking and Applications, Program Vice Chair

2015

International Conference on Multimedia and Ubiquitous Engineering, Program Committee

2015

International Conference on Grid and Pervasive Computing, Session Chair

2012