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한국과학기술연구소 Korea Institute of Science& Technology 1970~1974 한양화학주식회사 Korea Pacific Chemical Corporation 1974~1980 컴퓨터응용기술연구원 Computer Application Technology Institute 1980~1983 한화종합화학 Hanwha Chemical Co. Ltd 1983~1989 BASF Company Ltd. 1989~2004