On a Special Case of a Problem in the Cumulative Damage Model

누적(累積), 손상(損傷), 모형(模型)의 특이(特異)한 경우(境遇)에 관(關)한 연구(硏究)

An equipment is subject to shocks which occur randomly according to a Poisson process. The equipment fails when the total cumulative damage reaches a certain prescribed level. An optimal preventive replacement policy is presented when the level of cumulative damage cannot be checked. Renewal theory is used to obtain the results and a case example is presented.