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maintenance process model gamma gamma process system deterioration component function parameter action failure relation non-stationary gamma process distribution maintenance action policy approximation problem maintenance actions replacement brownian motion section probability dependence result production coating non-stationary level value article point structure inspection scale lemma motion brownian time t method horizon repair steel scale parameter tshg process optimization research condition randomized spot repair deterioration process example corrosion equation modelling shape effect steel structures density maintenance policies lifetime table number variable decision interaction estimate algorithm likelihood 1 1 simulation interval figure 6 1 expression estimation chapter multi-component dekker
