1. a Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-2-12-1 Oh-okayama, Meguro, Tokyo 152-8552, Japan
2. b Niigata Shinkansen Rolling Stock Depot, East Japan Railway Company, 254 Nagasawa, Terayama, Niigata-City, Niigata 950-0892, Japan
3. c Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-2-12-1 Oh-okayama, Meguro, Tokyo 152-8552, Japan