- 1988 - 1989 Sony Corporation
- 1988 - 1989 Sony Language Laboratory, Teacher(part-time)
- 1987 - 1988 Koryo International College
- 1987 - 1988 Nagoya University of Commerce and Business
- 1987 - 1988 Koryo Women's Junior College, Assistant Professor(part-time)
- 1987 - 1988 Nagoya University of Commerce and Business Administration Assistant Professor(part-time)
- 1981 - 1984 南山大学英米科 教務助手(非常勤)
- 1981 - 1984 Nanzan University, Teaching Assistant(part-time)
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