(1) Database of Ministry of Health, Labour and Welfare in Japana, http://www.mhlw.go.jp/english/index.html
(2) United Nations Economic Commisiion for Europe, 国連欧州経済委員会,http://www.unece.org/
(3) International Federation of Robotics, 国際ロボット連盟,http://www.ifr.org/
(4) T. Matsunaga : “View of advanced interface technology which supports advanced activity of elderly in Japan”, SICE Annual Conference of System Integration (2004) (in Japanese)