1. Postdoctoral Fellow, Nichibunken, International Research Centre for Japanese Studies , 3-2 Goryo Oeyama-cho, Nishikyo-ku, Kyoto 610-1192 Japan ; Visiting Researcher, Okinawa Institute for Science and Technology, 1919-1 Tancha, Onna, Kunigami District, Okinawa 904-0495