1. Freelance Researcher, Central WardSapporo064 Japan
2. Faculty of ScienceUniversity of Ryukyus, 1 Senbaru, Nishihara‐cho, Nakagami‐gunOkinawa903‐0213 Japan
3. Center for Materials research by Information Integration (CMI2),National Institute for Materials Science (NIMS), 1‐2‐1 SengenTsukuba Ibaraki305‐0047 Japan
4. Graduate School of EngineeringHokkaido University, N‐13, W‐8Sapporo060‐8628 Japan