Determination of Optimal Process Mean and Screening specification Limits for a Production Process

Lee, Min-Koo; Choi, Yong-Sun

Journal of Korean Society for Quality Management > Volume 28(2); 2000 > Article

Journal of Korean Society for Quality Management 2000;28(2): 1-.

생산공정의 최적공정평균 및 검사기준값의 결정기법 연구

이민구, 최용선

인제대학교 산업시스템공학과

Determination of Optimal Process Mean and Screening specification Limits for a Production Process

Min-Koo Lee, Yong-Sun Choi

Dept. of Industrial & Systems Engineering, Inje University

ABSTRACT

This paper considers the problem of determining the optimal process mean and screening specification limits of a surrogate variable associated with product quality under two-stage screening procedure. In two-stage screening, the surrogate variable is inspected first to decide whether an item should be accepted, rejected or additional observations should be taken. If additional observations are required, the performance variable of interest is then observed to classify the undecided items. Assuming that the performance variable and the surrogate variable are jointly normally distributed, the optimal process mean and the screening limits are obtained by maximizing the expected profit which includes selling price, production, reprocessing, inspection and penalty costs. A numerical example is presented and numerical studies are performed to compare the proposed two-stage screening procedure with single-stage screening procedures.

Key Words: Process Mean;Screening Specification Limits;Surrogate Variable;Performance Variable;Screening Procedure;