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dc.contributor.authorLiao, Mou-Yuanen_US
dc.contributor.authorPearn, W. L.en_US
dc.contributor.authorLiu, Yen-Lunen_US
dc.date.accessioned2015-12-02T02:59:05Z-
dc.date.available2015-12-02T02:59:05Z-
dc.date.issued2015-08-03en_US
dc.identifier.issn0020-7543en_US
dc.identifier.urihttp://dx.doi.org/10.1080/00207543.2015.1041572en_US
dc.identifier.urihttp://hdl.handle.net/11536/127839-
dc.description.abstractProcess capability indices (PCIs) have been widely adopted for quality assurance activities. By analysing PCIs, a production department can trace and improve a poor process to enhance product quality level and satisfy customer requirements. Among these indices, C-pk remains the most prevalent for facilitating managerial decisions because it can provide bounds on the process yield for normally distributed processes. However, processes are often non-normal in practice, and C-pk may quite likely misrepresent the actual product quality. Hence, the flexible index C-jkp, which considers possible differences in the variability above and below the target value, has been developed for practical use. However, C-jkp continues to suffer from serious bias in assessing actual capability, especially when the process distribution is highly skewed. In this paper, we modify C-jkp for assessing the actual process quality of a Gamma process. A correction factor is obtained by the curve-fitting method. The results show that our proposed method can significantly reduce the bias for calculation of actual nonconformities. Moreover, we introduce a sample estimator for our modified index. The ratio of this estimator\'s average value and the modified index is approximately 1. This implies that our proposed estimator can provide an appropriate estimation for assessing the actual Gamma process quality.en_US
dc.language.isoen_USen_US
dc.subjectcurve fittingen_US
dc.subjectflexible capability indexen_US
dc.subjectGamma distributionen_US
dc.subjectnon-normalen_US
dc.titleAssessing the actual Gamma process quality - a curve-fitting approach for modifying the non-normal flexible indexen_US
dc.typeArticleen_US
dc.identifier.doi10.1080/00207543.2015.1041572en_US
dc.identifier.journalINTERNATIONAL JOURNAL OF PRODUCTION RESEARCHen_US
dc.citation.volume53en_US
dc.citation.issue15en_US
dc.citation.spage4720en_US
dc.citation.epage4734en_US
dc.contributor.department工業工程與管理學系zh_TW
dc.contributor.departmentDepartment of Industrial Engineering and Managementen_US
dc.identifier.wosnumberWOS:000356600700017en_US
dc.citation.woscount0en_US
Appears in Collections:Articles