Results 101 to 110 of about 4,710 (223)
BarekengThe Exponentially Weighted Moving Average (EWMA) control chart is a widely used memory-type control chart known for detecting small shifts in process means.
Erna Tri Herdiani +1 more
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Multivariate Statistical Process Control Charts: An Overview
In this paper we discuss the basic procedures for the implementation of multivariate statistical process control via control charting. Furthermore, we review multivariate extensions for all kinds of univariate control charts, such as multivariate ...
Bersimis, Sotiris +2 more
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The exponentially weighted moving average (EWMA) control charts with variable sampling intervals (VSIs) have been shown to be substantially quicker than the fixed sampling intervals (FSI) EWMA control charts in detecting process mean shifts.
Yu-Chang Lin, Chao-Yu Chou
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New extended exponentially weighted moving average control chart for monitoring process mean
HeliyonIn this article, we develop a new control chart based on the Exponentially Weighted Moving Average (EWMA) statistic, termed the New Extended Exponentially Weighted Moving Average (NEEWMA) statistic, designed to recognize slight changes in the process ...
Hina Javed, Muhammad Ismail, Nadia Saeed
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A modified EWMA run-to-run control in its application to semiconductor manufacturing
, 2007 在各種半導體產業製程中 (如化學機械研磨、微影製程…等)，因為品質量測必須要在晶片出機台後才得進行，因此根據量測所進行控制只能反應在下一片晶片上，這種控制方式被稱為批次控制或片間控制。在上述批次控制中，EWMA (Exponential weighted moving average) 控制是經常被使用的一種控制作法。在 EWMA 控制中通常是將製程視為可用簡單的線性關係 (如: Yt = a+bUt-1)表示。但是在實際程序中因外界擾動或負荷的影響可能會使得程序批次間產生一個自我相關 ...
徐仁國, Hsu, Jen-Kuo
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Monitoring process mean with a new EWMA control chart
, 2011 In practice, sometimes the process data did not come from a known population distribution. So the commonly used Shewhart variables control charts are not suitable since their performance could not be properly evaluated.
Tsai Wen-Chi +4 more
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BBR: Brazilian Business Review, 2007 Este artigo explora três modelos utilizados para a estimativa da volatilidade: suavização exponencial - EWMA, volatilidade condicional - GARCH e volatilidade estocástica - VE. A volatilidade estimada por estes modelos pode ser utilizada em uma métrica de
Fernando Caio Galdi +1 more
doaj
A Review and Evaluation of Statistical Process Control Methods in Monitoring Process Mean and Variance Simultaneously [PDF]
Journal of Optimization in Industrial Engineering, 2010 In this paper, first the available single charting methods, which have been proposed to detect simultaneous shifts in a single process mean and variance, are reviewed.
Ahmad Ostadsharifmemar +1 more
doaj
Bayesian optimization of EWMA control charts: A case on process variance monitoring
Kuwait Journal of ScienceBayesian control charts (BCC) are gaining prominence as powerful statistical process control tools for analyzing manufacturing processes and managing process variability.
Tahir Abbas +3 more
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THE MIXED UNIVARIATE CONTROL CHART EWMA AND CUSUM FOR FLAVOUR PRODUCTION QUALITY PROCESS MONITORING
Jurnal Matematika UNANDA control chart is an important statistical technique used to monitor the average quality of a process or dispersion. Shewhart control chart is used to detect larger disturbances in process parameters.
Surya Puspita Sari +2 more
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