The Formation of East-Asia culture and the Transition of Chosun-Ming diplomatic links in the late Koryo dynasty and early Chosun dynasty - Understand of the bacground and character of the 갑자상소(Gabja Sang So) of 최만리(Chie man lie)RISS소리듣기여말선초 동아시아 문화권 형성과 대명외교 추이