相關不良品檢驗對生產管制影響的推廣

Abstract

A production process with two quality levels and four states is presented.A sequence (k) sampling plan in which samples of k(k>0) consecutively produced items are taken periodically,and a simple decision rule based on the result of inspecting each sample are applied to control the process. It is assumed that each item has two correlated attributes X and Y. In practice, the cost of inspection of X is higher than the cost of inspection of Y and the result of inspectig X determines the item is good (acceptable) or bad (unacceptable).The problem of whether to use the inspection of X or Y is studied and some approximation results are obtained to compare the two inspection costs corresponding to X and Y.