• Independent (2012-Present)
• Professor of Electrical Engineering, Seoul National University (1986 ~ present)
• President, Communications, IEEE (2010 ~ 2 011)
• Commission Communication of Korea (2,008th ~ 2.01 thousand)
• President of the Association of Information and. Communication of Korea (KICS) (2007th ~ two thousand and seven)
• President of the Association of Engineering of Korea (KSEE) (2003 ~ 2 004)
• Vice President for Research, Seoul National University (two thousandth ~ 2 002)
• Technical Staff at AT & T Bell Laboratories (1984. ~ 1986)
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