ISSN : 2005-0461(Print)
ISSN : 2287-7975(Online)
ISSN : 2287-7975(Online)
Journal of Society of Korea Industrial and Systems Engineering Vol.22 No.52 pp.69-79
베타분포를 하는 비정규 공정능력평가의 종합적 측도
A Comprehensive Measure of Evaluation for Non-Normal Process Capability with Beta Distributions
Abstract
The main objective of this study are to propose two methods that would be a comprehensive measure of evaluation for non-normal process capability with Beta distributions. First method is introduced using process capability index Cpsk by the Pearson system and Johnson system. The Pearson system and the Johnson System selected for process capability index calculation have a equivalent result of this study that the ranking of the seven indices in terms of sensitivity to departure of the process median from the target value from the most sensitive one up to the least sensitive are C*pm , Cpsk , Cs , Cpsk , Cpm , Cpk , Cp. Second method show using the percentage nonconforming by the Pearson, Johnson and Burr functions. In thus study, we find that the Pearson system and the Burr system are a reasonable method to estimate percentage nonconforming. But, the exact procedure for deriving this estimate will be based on Beta distribution. Accordingly, if a process is not