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    政大機構典藏 > 商學院 > 統計學系 > 期刊論文 >  Item 140.119/46079


    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/46079


    Title: Using VSI EWMA charts to monitor dependent process steps with incorrect adjustment
    Authors: 楊素芬
    Yang,Su-Fen;Yu,Yi-Ning
    Keywords: Control charts;Dependent process steps;Incorrect adjustment;Markov chain
    Date: 2009.01
    Issue Date: 2010-10-06 11:21:08 (UTC+8)
    Abstract: The article considers the variable process control scheme for two dependent process steps with incorrect adjustment. Incorrect adjustment
    of a process may result in shifts in process mean, ultimately affecting the quality of products. We construct variable sampling interval
    (VSI) EWMAZX and EWMAZe control charts to effectively monitor the quality variable produced by the first process step with
    incorrect adjustment and the quality variable produced by the second process step with incorrect adjustment. The performance of the
    proposed VSI control charts is measured by the adjusted average time to signal (AATS) derived using a Markov chain approach. An
    example of the automobile braking system with incorrect adjustment shows the application and performance of the proposed VSI
    EWMAZX and EWMAZe control charts in detecting shifts in process mean. Furthermore, the performance of the proposed VSI
    EWMAZX and EWMAZe control charts and the fixed sampling interval (FSI) EWMAZX and EWMAZe control charts are compared
    by numerical analysis results. These demonstrate that the former is much faster in detecting small and median shifts in mean. The optimum
    VSI EWMAZX and EWMAZe control charts are also proposed using optimization technique to minimize AATS when quality engineers
    cannot specify the values of variable sampling intervals. It has been found that the optimum VSI EWMAZX and EWMAZe control
    charts always work better than the VSI EWMAZX and EWMAZe control charts.
    Relation: Expert System and Application,36(1),442-454
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1016/j.eswa.2007.09.036
    DOI: 10.1016/j.eswa.2007.09.036
    Appears in Collections:[統計學系] 期刊論文

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