||There are more and more countries facing the problem of aging population society, and the ratio of elder population keeps increasing recently. As a result, it’s necessary to pay more attention to the rights of elder people. The research focuses on issue “ Sit-to-Stand”, which is common problem to elder people. The research uses videotape analysis method to realize the action of standing up, and examines auxiliary strategy, which is used nowadays, by measuring ground reaction vertical forces and subjects' perception. Then the research addresses the problem with old strategy and modifies it. Finally, the research proposes new auxiliary strategy, which is much safer when using newly designed Assistive device.|
Based on new auxiliary strategy, the research determines the designed goal after reviewing related patterns, and acquires solutions from two sub-goals, which are segmented from the designed goal. Then the research analyzes structural safety by using computer, and uses optimal method to derive actuator’s location. The research manufactures a test machine, and examines the theory of new auxiliary strategy by measuring users’ perception of usability.