Describes about a notification method of robotic arm motion for suppressing threats to humans. The method is evaluated subjectively and the effectiveness is shown. Firstly, it is found that an optimal time for the notification was about one second. Secondly, the effect of several informations for the notification is investigated and the effectiveness is verified. Finally, a threat against the arm configuration is investigated and it is shown that it depends on the number of the moving joints.
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Ikeura et al. (2002) studied this question.