In the computerized interlocking system for railway train control, the degree of deterioration of parts can be measured, but the calculation of the lifetime of the system is difficult when the initial value of the parts is unknown. The reason for this is that the range of the initial value of the parts is too wide. In this paper, we propose a new method to appropriately estimate the degree of deterioration of a certain type of part without knowing the initial value by measuring the current value once.
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