Affiliation: | (1) Faculty of Engineering, Hiroshima University, Saijo-cho, 724 Higashi-hiroshima, Japan;(2) Faculty of Arts and Sciences, Hiroshima University, 1-1-89 Higashi-senda-machi, Naka-ku, 730 Hiroshima, Japan;(3) Faculty of Engineering, Fukuyama University, Sanzo, Higashimura-cho, 729-02 Fukuyama, Japan;(4) City of Osaka Public Engineering, Works Foundation Office, Umeda UN Building, 5-14-10 Nishi-tenma, Kita-ku, 530 Osaka, Japan |