2020 Volume 56 Issue 1 Pages 11-19
In Safety-1, safety is defined as having as few as possible negative outcomes, and in Safety-2, safety is defined as having as many success outcomes as possible. In this study, we aimed to experimentally verify the effectiveness of using Safety-1 mode and Safety-2 mode properly according to the situational variability, and to derive a quantitative indicator of the situational variability that should switch between both modes. The following was clarified from the result of the simulation experiment which assumed fire extinguishing activity. 1） The larger the situational variability, the more cases will be switched from Safety-1 mode to Safety-2 mode, but switching to the Safety-2 mode is a minority, as long as the situation does not change by more than 15 times the steady state. 2） The larger the situational variability, the more successful outcomes will be in the Safety-2 mode than in the Safety-1 mode, and an indication of better switching timing to achieve a successful outcome is that the magnitude of the situational variability 4-6 times relative to steady state.