“…Currently the development of various robotic aids or devices for helping the elderly's walking has attracted many researcher's attentions. Guidecane ( (Ulrich & Borenstein, 2001)), PAM-AID ( (Lacey & Dawson-Howe, 1998)), Care-O-bot ( (Graf et al, 2004)), PAMM ((S. Dubowsky, 2000)), and etc, are developed for intelligent walking support and other tasks for the elderly or the disabled. Mainly for the elderly's walking support, a robotic power-assisted walking support system is developed (Nemoto & M. Fujie, 1998).…”