1. Professor, Dept. of Urban and Civil Engineering, Ibaraki Univ., Nakanarusawa 4-12-1, Hitachi 316-8511, Japan.
2. Visiting Scholar, Dept. of Urban and Civil Engineering, Ibaraki Univ., Nakanarusawa 4-12-1, Hitachi 316-8511, Japan; formerly, Associate Professor, Dept. of Civil Engineering, Guangdong Univ. of Technology, Guangzhou 510090, P. R. China.
3. PhD Candidate, Dept. of Urban and Civil Engineering, Ibaraki Univ., Nakanarusawa 4-12-1, Hitachi 316-8511, Japan.