New Method of Medieval Archaeology in East Asia : Interaction and trade

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In this study, I adopted new study methods such as technique of the underwater archaeology and exploration geophysicists about the Medieval Archaeology.And I searched the Ryukyu Islands and relations with the other areas. I pushed forward different study methods and investigation and the study that chose the area till now.As a result, in the field of underwater archaeology that the grope of the study method continued, I confirmed the seafloor topography which I used bottom of the sea sound wave surveying instruments and the effectiveness of the geological survey method.Furthermore, about investigation technique on the ground for the underwater finds, I reported results of research for artifacts excavated from Takashima underwater site in Matsuura, Nagasaki.In addition, I researched in Gusuku sites and Shitooke Nanajo in Kikai island, the Amami Islands. I performed document investigation about the sites of excavated Koryo roof tiles in Nago, Okinawa.I published the report of the symposium about Gusuku Sites in Kikai Island and working papers about Koryo roof tile s excavated in Nago, Okinawa.On the basis of them, I gathered results of research report on the basis of comparison with East Asia.