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An Economic Design of the EWMA Control Charts with Variable Sampling Interval  

송서일 (동아대학교 산업 시스템공학과)
정혜진 (동아대학교 산업 시스템공학과)
Publication Information
Journal of Korean Society for Quality Management / v.30, no.4, 2002 , pp. 1-14 More about this Journal
Abstract
Traditional SPC techniques are looking out variation of process by fixed sampling interval and fixed sample size about every hour, the process of in-control or out-of-control couldn't be detected actually when the sample points are plotted near control limits, and it takes no notice of expense concerned with such sample points. In this paper, to overcome that, consider VSI(variable sampling interval) EWMA control charts which VSI method is applied. The VSI control charts use a short sampling internal if previous sample points are plotted near control limits, then the process has high probability of out-of-control. But it uses a long sampling interval if they are plotted near centerline of the control chart, since process has high possibility of in-control. And then a comparison and analysis between FSI(fixed sampling interval) and VSI EWMA in the statistical aspect and economic aspect is studied. Finally, we show that VSI EWMA control chart is more efficient than FSI EWMA control chart in the both aspects.
Keywords
VSI 관리도;
Citations & Related Records
연도 인용수 순위
  • Reference
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