1. Department of Mechanical EngineeringDoshisha University 1‐3 Miyakodani, Tatara, Kyotanabe Kyoto 610‐0394 Japan
2. PRESTOJapan Science and Technology Agency 7 Gobancho, Chiyoda‐ku Tokyo 102‐0076 Japan
3. NSK Ltd. 1‐5‐50 Kugenuma‐Shinmei Fujisawa Kanagawa 251‐8501 Japan
4. Graduate School of Science and EngineeringDoshisha University 1‐3 Miyakodani, Tatara, Kyotanabe Kyoto 610‐0394 Japan
5. Kyoto University Research Reactor Institute (KURRI) 2 Asashiro‐Nishi, Kumatori‐cho, Sennan‐gun Osaka 590‐0494 Japan