標題: Modified weighted standard deviation index for adequately interpreting a supplier's lognormal process capability
作者: Liao, Mou-Yuan
Pearn, W. L.
工業工程與管理學系
Department of Industrial Engineering and Management
關鍵字: Lognormal;process capability;supplier evaluation;yield
公開日期: 1-Feb-2019
摘要: The process capability index has become an efficient tool for measuring a supplier's process performance. Cpk(WSD) is one popularly used index for assessing non-normal process capability when the process violates the normality assumption. Unfortunately, this index cannot accurately reflect the process yield, so it may produce a serious result if the practitioner compares the calculated Cpk(WSD) value with the capability requirement to determine whether the process meets that requirement. Hence, this study modifies Cpk(WSD) to provide an adequate measure of lognormal process capability. In addition, an estimator of this modified index is also provided. Simulations show that the bias of this estimator is slight, and the coverage probability of capability testing is close to the nominal confidence. This means that our proposed method is adaptable for use.
URI: http://dx.doi.org/10.1177/0954405418755820
http://hdl.handle.net/11536/148761
ISSN: 0954-4054
DOI: 10.1177/0954405418755820
期刊: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
Volume: 233
起始頁: 999
結束頁: 1008
Appears in Collections:Articles