ABSTRACT

Sampling inspection is one of preventive quality methods for decreasing waste of time and cost, but should be along with other quality control approaches to effectively enhance product quality. Determination of optimum process mean tends to reduce the bias of the central tendency of process characteristic from its target, and has been an important topic in quality system design. Pulak and Al-Sultan developed a single sampling rectifying inspection model to determine the optimum process mean, based on maximization of the expected total profit per item. Since setting the economic specification limits for process characteristic is considered a short-term approach for quality assurance and, on the other hand, quality investment is a long-term approach for process improvement, in the present paper, a modified product inspection model, which is modified from Pulak and Al-Sultan’s work, is firstly presented to simultaneously determine the optimum process mean and economic specification limits, based on maximization of the expected total profit per item. Then, quality investment is integrated into this modified model to obtain the optimum quality investment level.

摘要

抽样检查是减少时间和成本浪费的预防性质量方法之一，但应与其他质量控制方法一起使用，以有效提高产品质量。确定最佳过程均值趋于减少过程特征的集中趋势与其目标之间的偏差，并且已成为质量体系设计中的重要课题。Pulak和Al-Sultan开发了一个单一的采样校正检查模型，以最大程度地预期每件物品的总利润为基础，确定最佳工艺平均值。由于为过程特性设定经济规格限制被认为是保证质量的短期方法，另一方面，质量投资是改善过程的长期方法，因此，本文提出了一种改进的产品检验模型，它是根据Pulak和Al-Sultan的工作修改而来的，首先提出该方法，以便根据预期的每个项目的总利润的最大化，同时确定最佳工艺平均值和经济规格限制。然后，将质量投资整合到此修改模型中，以获得最佳质量投资水平。