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Introduce and Compare Two Approaches for Monitoring a Two-Stage Process by Profile Quality Characteristic in the Second Stage

Author Affiliations

  • 1 Department of Industrial Engineering, Yazd University, Yazd, IRAN

Res. J. Recent Sci., Volume 2, Issue (6), Pages 32-42, June,2 (2013)


The quality of products is monitored according to the different control charts for quality characteristics of them. These quality characteristics are either variable or attribute can be a single variable, or a vector of variables or a profile relationship. However, because the quality of the product is the result of the performance of different procedures on the product, and usually these stages are not independent of each other, therefore, the assumption of independent process affecting error on the quality of the output. Up to now the effects of these situations on monitoring the multi-stage processes with single or multi variables were being examined. Though, multi-stage profile processes were less appealing for researchers. This paper introduces a model for a two-stage profile in addition to two different approaches that have been proposed for monitoring process.And the variation of the coefficients of the profile, as well as changes in the quality characteristics of the first stage, in a two-stage process, on the second phase control charts were reviewed.


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