 in 2001 for his first book, "Chosen/Kankoku Nashonarizumu to 'Shokoku-Ishiki"' ("Korean Nationalism as a Small Nation").He became a Research Associate at Faculty of Law and Literature of Ehime University in 1993, and taught between 1994 and 1997 as a Lecturer at the same university.In 1997 he moved to the Graduate School of International Cooperation Studies, Kobe University as an associate professor, and became a full professor in April 2005.