Affiliation: | (1) ATR Human Information Processing Research Laboratories, 2-2 Hikaridai, Seika-cho, Soraku-gun, 619-02 Kyoto, Japan;(2) Present address: Kawasaki Steel Corporation, System Lab, Makuhari Techno Garden, 1-3 Nakase Mihama-ku, 261 Chiba, Japan |