Abstract
In order to prevent mistakes, we improved the visibility of the alarm. But, many failures can be missed if the operator doesn't place trust in the machine. In this research, we built a model to increase operator reliability in the machine, thus enabling the detection of more failures. The alarm and machine fail or pass with constant probability. An operator can choose to put trust in the alarm or not as well as, and stop the machine if it is judged that the machine has failed. We calculated the miss rate for the system using the machine and alarm failure rates and the reliability of the operator. As a result, if the failure rate of the machine is small but the failure rate of the alarm and the reliability of the operator are large, then work capacity is decreased due to the misinformation. This, in turn, causes operators to ignore alarms. This problem is an important accident factor related to the reliability of machines used in the medical field.
