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    題名: 相依製程上平均值和變異數過度調整之適應性管制(II)
    其他題名: Adaptive Control for Over-Adjusted Means and Variances on Dependent Process Setps (II)
    作者: 楊素芬
    貢獻者: 政治大學統計系
    行政院國家科學委員會
    關鍵詞: 數學
    Control charts;dependent process steps;incorrect adjustment;Markov chain.
    日期: 2006
    上傳時間: 2012-08-30 09:58:50 (UTC+8)
    摘要: 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) Z X EWMA and Ze EWMA control charts to effectively monitor the quality variable produced by the first process step with incorrect djustment and the quality variable produced by the second process step with incorrect djustment. 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 pplication and performance of the proposed VSI Z X EWMA and Ze EWMA control charts in detecting shifts in process mean. Furthermore, the performance of the proposed VSI Z X EWMA and Ze EWMA control charts and the fixed sampling interval (FSI) Z X EWMA and Ze EWMA control harts are compared by numerical analysis results. These demonstrate that the former is much faster in detecting small and median shifts in mean. The ptimum VSI Z X EWMA and Ze EWMA control charts are also proposed using optimization technique when quality engineers cannot specify the values of variable sampling intervals. It has been found that the optimum VSI Z X EWMA and Ze EWMA control charts always work better than the VSI Z X EWMA
    and Ze EWMA control charts.
    關聯: 應用研究
    學術補助
    研究期間:9508 ~ 9607
    研究經費:614仟元
    資料類型: report
    顯示於類別:[統計學系] 國科會研究計畫

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