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Unique exploration method of electronic component failure time and yield strengths of circular tubes under complete flexible model. [PDF]

PLoS One
Jabeen R, Ahmad M, Zaka A, Nagy M, Al-Mofleh H.   +4 more
europepmc   +1 more source

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An Extended EWMA Mean Chart

Quality Technology and Quantitative Management, 2005
AbstractIn this paper, we extend the exponentially weighted moving average (EWMA) technique to double exponentially weighted moving average (DEWMA) technique. We show that DEWMA mean charts perform better than EWMA mean charts in detecting small mean shifts ranging from 0.1 to 0.5 of the process standard deviation, and that the two types of charts ...
Lingyun Zhang, Gemai Chen
exaly   +2 more sources

Mixed EWMA-CUSUM and mixed CUSUM-EWMA modified control charts for monitoring first order autoregressive processes

Quality Technology and Quantitative Management, 2017
In practice most processes are known to produce autocorrelated observations. Autocorrelation degrades the performance of control charts by producing frequent false alarms when the process is stable or makes the charts respond slowly to the detection of ...
Saddam Akber Abbasi, Muhammad Riaz
exaly   +2 more sources

An adaptive multivariate EWMA chart

Computers & Industrial Engineering, 2019
Abstract The adaptive multivariate EWMA (AMEWMA) and adaptive multivariate CUSUM (AMCUSUM) charts are recently proposed as they provide an overall good detection over a range of mean shift sizes than their non-adaptive conventional counterparts. In this paper, we propose an adaptive MEWMA (AMEWMA) chart for monitoring the infrequent changes in the ...
Abdul Haq, Michael B. C. Khoo
openaire   +1 more source

The efficiency of the EWMA capability chart

2007 IEEE International Conference on Industrial Engineering and Engineering Management, 2007
In order to monitor unstable but capable processes Castagliola & Vannman have recently suggested a procedure based on an EWMA approach, called EWMA capability chart, for monitoring Vannman's Cp(u,v)-family of capability indices and showed how their proposed approach efficiently monitors capable processes by detecting a decrease or increase of the ...
Castagliola, Philippe, Vännman, Kerstin
openaire   +2 more sources

New EWMA charts for process variance

Quality and Reliability Engineering International, 2023
AbstractThe EWMA chart is effective in detecting small shifts in the process mean or process variance. Numerous EWMA charts for the process variance have been suggested in the literature. In this article, new one‐sided and two‐sided EWMA charts are developed for monitoring the variance of a normal process.
Abdul Haq, Umme Kalsoom, Michael B. C. Khoo   +2 more
openaire   +1 more source

Economic designs of constrained EWMA and combined EWMA-X¯ control schemes

IIE Transactions, 2001
Abstract This research presents a comparison between the cost performance of the Exponentially Weighted Moving Average EWMA) and the combined EWMA-X¯ control chart schemes. In particular, we explore the impact of constraining the in-control average run length on the optimal cost performance of both schemes.
GILBERT O. TOLLEY, JOHN R. ENGLISH
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EWMA and adaptive EWMA variable sampling intervals charts for simultaneous monitoring of Weibull parameters

Quality Technology & Quantitative Management, 2021
In this article, we first propose an exponentially weighted moving average (EWMA) chart for monitoring both the shape and scale parameters of the Weibull distribution.
Longcheen Huwang, Cheng-Han Wu, Yan-Ru Lee   +2 more
openaire   +1 more source