research institute of electrical communication, tohoku university katahira campus, 2-1-1 katahira, aoba-ku, sendai, miyagi, japan (on the premises of katahira complex, tohoku university)
3-4-1 kowakae, higashiosaka city, osaka
1-1-1 sakuragaoka, setagaya-ku, tokyo
5-5-1, kashiwaicho, tachikawa-shi, tokyo
2-2-11 toyo, koto-ku, tokyo
27 waseda-cho, shinjuku-ku, tokyo