1. Department of Environment Science and Human Engineering, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Urawa, Saitama, 338-8570 Japan
2. Department of Urban Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8656 Japan
3. Research Development Department, Maezawa Industries, INC. 5-11 Nakachuo, Kawaguchi, Saitama, 332-8556 Japan