Positions Held

• 2010 - Present: Korea University, Seoul, Republic of Korea, Professor
• 2005 - 2009: Korea University, Seoul, Republic of Korea, Associate Professor
• 2009 - 2011: The State University of New York at Stony Brook, USA, Adjunct Professor
• 2002 - 2004: Korea University, Seoul, Republic of Korea, Assistant Professor
• 2001 - 2002: Ewha Women's University, Republic of Korea, Full-Time Lecturer (Tenure-Track)
• 2000: The University of Missouri, Kansas City, USA, Assistant Professor
• 1996-1999: The University of Minnesota at Minneapolis, USA, Post-Doctorial Research and Research Assistant
• 1998: SRI (Stanford Research Institute), USA, Student Research Associate
• 1995-1996: The University of Maryland at College Park, USA, Research Assistant and Teaching Assistant
• 2008.12 - 2013.11: Head of WCU Future Network Optimization Technology (FNOT) Center at Korea University, with cooperation with Prof. D.-Z. Du at University of Texas, Dallas
• 2008.02 - 2010.01: Head of RFID Research Center, Korea University, Korea
• 2008.03 - 2008.08: Head Professor, Information & Communication Program (ICP) (정보통신 최고위과정 주임교수), Korea University, Korea
• 2008.01 - present: Board of Director Member, KIPS (한국정보처리학회 이사)
• 2007 - present: R&D Budget Coordination Committee Member, Ministry of Science and Technology (MOST), Korea Goverment (국가과학기술위원회(국과위) 혁신본부 국가 R&D 예산조정전문위원회 전문위원)
• 2006.01 - present: IEEE senior member
• 2005.02 - 2007.2: Legislative Counseling Member (Information and Communication Committee), Korea National Assembly (대한민국국회 입법지원위원(총83인), 정보통신분과 소속위원)
• 2005.03 - present: Board of Director Member, OSIA (개방형 컴퓨팅통신연구회 이사)
  

Professional Activities

• Program Commitee
• Program Commitee, the 30th IEEE Annual Conf. on Computer Communications (INFOCOM-2011), Shanghai, China
• Program Commitee, the 29th IEEE Annual Conf. on Computer Communications (INFOCOM-2010), San Diego, CA, USA
• Program Committee, the 45th IEEE International Conference on Communications (ICC-2010) - Wireless and Mobile Networking Symposium (ICC'10 WNS), Cape Town, South Africa
• Program Commitee, the 52th IEEE Global Communications Conference (Globecom-2010), Miami, Florida, USA
• Program Commitee, the 28th IEEE Annual Conf. on Computer Communications (INFOCOM-2009), Rio de Janeiro, Brazil
• Program Commitee, the 6th IEEE Int'l Conf. on Broadband Comm., Networks, and Systems (Broadnets-2009), Madrid, Spain
• Program Commitee, the 17th IEEE Int'l Conf. on Computer Comm. & Networks (ICCCN-2008), St. Thomas U.S. Virgin Islands, USA (Protocols and Algorithms for Wireless Networks Track)
• Program Commitee, the 16th IEEE Int'l Conf. on Computer Comm. & Networks (ICCCN-2007), Honolulu, Hawaii, USA (Wireless Ad-hoc and Sensor Network Track)
• Program Commitee, the 3rd IEEE Int’l Conf. on Broadband Comm., Networks, and Systems (BroadNets-2006), San Jose, USA 
• Program Committee, IEEE International Conference on Computer Communications and Networks (ICCCN - 2005), USA.
• Program Commitee, the 13th IEEE International Conference on Computer Communications and Networks (ICCCN - 2004), USA.
• Program Commitee, the 11th IEEE International Conference on Computer Communications and Networks (ICCCN - 2002), USA. the 10th IEEE International Conference on Computer Communications and Networks (ICCCN - 2001), USA.
• Program Committee and Session Chair, IEEE International Conference on Computer Communications and Networks (IC3N - 2000), USA.
• Technical Program Commitee
  • Technical Program Committee, the 10th ACM Int'l Symp. on Mobile Ad Hoc Networking & Computing (MobiHoc-2009), New Orleans, LA,USA
  • Technical Program Committee, the 9th ACM Int'l Symp. on Mobile Ad Hoc Networking & Computing (MOBIHOC-2008), Hong Kong, China
  • Technical Program Committee, the 27th IEEE Annual Conference on Computer Communications (INFOCOM-2008), Phoenix, Arizona, USA
  • Technical Program Committee, the 5th IEEE Int’l Conf. on Broadband Comm., Networks, and Systems (BroadNets-2008), London, UK

Research Interests

• Wireless Sensor Network (WSN) Protocols
• Design and Analysis of Next-Generation Communication Network Protocols
• Wireless Ad-Hoc Networking (MANET) and Security
• Mobility Support for 4G Wireless Communication Systems