Evaluation of Mental Stress by Analyzing Accelerated Plethysmogram Applied Chaos Theory and Examination of Welfare Space Installed User's Vital Sign

Abstract Welfare environment is considered special care such as support to stand up, sit up, walk, take a medicine, etc. Therefore, it is usefulness that the welfare environment support customer by service robot and consider its mind. A analyze brain waves is a kind of mind understanding. However, big equipment is needed for accuracy. In this paper, authors research a possibility of diagnosis of stress by accelerated plethysmogram applied the criterion which combine two evaluation based on chaos theory; trajectory parallel measure method and size of neighborhood space in chaos attractor. And, it calculates time-series data of accelerated plethysmogram measured from forty-tester using proposed evaluations. The authors examine the result of its application to diagnose of stress. Finally, the authors examine that customer's vital information is usefulness to control a service robot and an environment of room based on an ambient Intelligence.