Human errors occurred in operating man-made systems, such as passenger ships, aircrafts and nuclear energy facilities, may cause enormous damage of things or great loss of human lives. However, it is not easy to evaluate the occurrence of human errors in the stages of design, building and service. It is also difficult to measure human response to internal/external stimuli or stress, because of technical difficulties and the ambiguity due to inter- and/or intra-subject variability. Facial expression is understood one of the most effectual parameter to evaluate human psychological situation. And, it can be measured non-invasively, without any electrodes or sensors on the face. Another advantage of facial-expression analysis is that those of many people can be also recorded all together easily using a compact video camera. The authors showed that it may be possible to estimate the degree of motion sickness using changes of breadth between eyebrows, openness of eyes and openness of mouth and that it is essential to measure, analyse and evaluate the dynamic factors of facial expressions in order to take account of dynamic changes of psychological responses [Arima et al., 1998]. The purpose of this study is to develop the human-response measuring system and to establish the methods of analysis and evaluation of human factors during exposure to external stimuli/stress, such as low-frequency oscillations on board ships.
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