1. Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
2. Research Reactor Institute, Kyoto University, Kumatori, Sennan-gun, Osaka 590-0494, Japan
3. NBC Inc., 2-50-3 Toyoda, Hino, Tokyo 191-0053, Japan