頃滉淡瓿柬暀旮办垹鞐瓣惮靻� Korea Institute of Science& Technology 1970~1974
頃滌枒頇旐暀欤检嫕須岇偓 Korea Pacific Chemical Corporation 1974~1980
旎错摠韯办潙鞖╆赴靾犾棸甑洂 Computer Application Technology Institute 1980~1983
頃滍檾膦呿暕頇旐暀 Hanwha Chemical Co. Ltd 1983~1989
BASF Company Ltd. 1989~2004
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