Institution: | 1. Shimizu Corporation, Tokyo 105‐8007, Japan;2. Nippon Express Co. Ltd, Tokyo 105‐8322, Japan;3. Research Institute for Science and Engineering, Waseda University, Tokyo 169‐8050, Japan;4. Graduate School of Science and Technology, Niigata University, Niigata 950‐2181, Japan;5. Faculty of Education and Integrated Arts and Sciences, Waseda University, Tokyo 169‐8050, Japan (email: hideo@waseda.jp) |