1. Hitachi Cable, Ltd., 5-1-1 Hitaka-cho, Hitachi-shi, Ibaraki-ken 319-1414, Japan
2. Shizuoka University, 3-5-1 Johoku, Hamamatsu-shi, Shizuoka-ken 432-8561, Japan
3. The Japan Steel Works, Ltd., 6-1 Funakoshi-minami 1, Aki-ku Hiroshima-shi, Hiroshima-ken 736-8602, Japan
4. National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki-ken 305-8565, Japan