Affiliation: | Department of Civil Engineering Systems, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-01, Japan., JP Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611, Japan., JP Faculty of Informatics, Okayama University of Science, Ridaicho 1-1, Okayama 700, Japan., JP
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