標題: An overview of theory and practice on process capability indices for quality assurance
作者: Wu, Chien-Wei
Pearn, W. L.
Kotz, Samuel
工業工程與管理學系
Department of Industrial Engineering and Management
關鍵字: Expected relative loss;Fraction non-conforming;Process capability indices;Process consistency;Process relative departure;Quality assurance
公開日期: 1-二月-2009
摘要: Process capability indices (PCIS), C(p), C(a), C(pk), C(pm), and C(pmk) have been developed in certain manufacturing industry as capability measures based on various criteria, including process consistency, process departure from a target, process yield, and process loss. It is noted in certain recent quality assurance and capability analysis works that the three indices, C(pk), C(pm), and C(pmk) provide the same lower bounds on the process yield. In this paper, we investigate the behavior of the actual process yield, in terms of the number of non-conformities (in ppm), for processes with fixed index values of C(pk) = C(pm) = C(pmk), possessing different degrees of process centering. We also extend Johnson's [1992. The relationship of C(pm) to squared error loss. journal of Quality Technology 24, 211-215] result formulating the relationship between the expected relative squared loss and PCIs. Also a comparison analysis among PCIs is carried out based on various criteria. The result illustrates some advantages of using the index C(pmk) over the indices C(pk) and C(pm) in measuring process capability (yield and loss), since C(pmk) always provides a better protection for the customers. Additionally, several extensions and applications to real world problem are also discussed. The paper contains some material presented in the Kotz and Johnson [2002. Process capability indices-a review, 1992-2000. journal of Quality Technology 34(1),1-19] survey but from a different perspective. It also discusses the more recent developments during the years 2002-2006. (C) 2009 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijpe.2008.11.008
http://hdl.handle.net/11536/7703
ISSN: 0925-5273
DOI: 10.1016/j.ijpe.2008.11.008
期刊: INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS
Volume: 117
Issue: 2
起始頁: 338
結束頁: 359
顯示於類別:期刊論文


文件中的檔案:

  1. 000264002300010.pdf