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A power-assisted chair is a welfare apparatus that helps the user standing up from a chair. Instead of a mechanical way of assist, a power-assisted chair, which generates assist force in a human friendly manner, has been investigated. The system concept of the power-assisted chair is based on the use of information of standing-up motion. Some techniques to control assist force are summarized in this paper.doi:10.5739/isfp.1999.175 fatcat:jbzct6vupffwvgntkvnukcfbay