1. Department of Computer Science, Kitami Institute of Technology, Kitami, 090-8507, Japan
2. Information Processing Center, Kitami Institute of Technology, Kitami, 090-8507, Japan
3. Hirao school of management, Konan University, Nishinomiya, 663-8204, Japan
4. Division of Physics, Hokkaido University, Sapporo, 060-0810, Japan