1. Dept. of Civil Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan.
2. Mind Inc., 7-17-19-402 Maeharanishi, Funabashi, Chiba 274-0825, Japan.
3. School and Graduate School of Policy Studies, Kwansei Gakuin Univ., 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.