A Relaxation System Adapting to User's Condition. - Yasuhisa Hasegawa; Takeo Ootsuka; Toshio Fukuda; Fumihito Arai; Mitsuo Kawaguchi (ICRA, 2001)

Adaptive human interface for refreshing sleep based on biological rhythm. - Yuki Wakuda; Toshio Fukuda; Fumihito Arai; Akiko Noda; Yasuhisa Hasegawa; Mitsuo Kawaguchi (RO-MAN, 2005)

Biological Rhythm Based Wearable Sleep State Observer. - Yuki Wakuda; Akiko Noda; Yasuhisa Hasegawa; Fumihito Arai; Toshio Fukuda; Mitsuo Kawaguchi (J. Adv. Comput. Intell. Intell. Informatics, 2007)