1. NIIGATA UNIVERSITY, Graduate School of Science and Technology(8050, Ikarashi-2, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)
2. NIIGATA UNIVERSITY, Department of Civil Engineering(8050, Ikarashi-2, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)
3. UNIVERSITY OF YAMANASHI, Graduate School of General Research Department(4-3-11, Takeda, Kofu-shi, Yamanashi 400-8511, Japan)