1. College of Science, Ibaraki University, Mito, Ibaraki, Japan
2. Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki, Japan
3. The Canon Institute for Global Studies, Tokyo, Japan
4. College of Agriculture, Ibaraki University, Ami, Ibaraki, Japan
5. East Nippon Expressway Company Limited (NEXCO EAST), Tokyo, Japan
6. Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki, Japan