Search Results - "Machado, Marcela A. G."

An Interface to Monitor Process Variability Using the Binomial ATTRIVAR SS Control Chart by Violante, João Pedro Costa, Machado, Marcela A. G., Mendes, Amanda dos Santos, Almeida, Túlio S.

“…Control charts are tools of paramount importance in statistical process control. They are broadly applied in monitoring processes and improving quality, as…”
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Performance Analysis of Interval Type-2 Fuzzy X¯ and R Control Charts by Almeida, Túlio S., dos Santos Mendes, Amanda, Rocha Rizol, Paloma M. S., Machado, Marcela A. G.

“…Statistical process control (SPC) is one of the most powerful techniques for improving quality, as it is able to detect special causes of problems in…”
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The double sampling and the EWMA charts based on the sample variances by Machado, Marcela A.G., Costa, Antonio F.B.

“…We propose a new statistic to control the covariance matrix of bivariate processes. This new statistic is based on the sample variances of the two quality…”
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Monitoring the covariance matrix of bivariate processes with the DVMAX control charts by Machado, Marcela A. G., Lee Ho, Linda, Quinino, Roberto C., Celano, Giovanni

“…Two versions of Phase II attribute+variable (DVMAX) control charts are investigated for monitoring the covariance matrix ∑ of bivariate processes. Monitoring…”
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Evaluation of fatty acids production by Chlorella minutissima in batch bubble-column photobioreactor by Pereira, Félix M., Loures, Carla C.A., Amaral, Mateus S., Gomes, Fabrício M., Pedro, Guilherme A., Machado, Marcela A.G., Reis, Cristiano E.R., Silva, Messias B.

“…•A logistic model was used to describe the growth kinetics of Chlorella minutissima.•A mathematical model was developed to estimate the fatty acids…”
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Some Comments Regarding the Synthetic Chart by Machado, Marcela A. G., Costa, Antonio F. B.

“…The steady-state average run length (ARL) is a function of the in-control probabilities of being in each nonabsorbing state. Davis and Woodall (2002) tabulated…”
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A side-sensitive synthetic chart combined with an X chart by Machado, Marcela A.G., Costa, Antonio F.B.

“…The synthetic chart combined with an chart (Synthetic- chart) signals when a sample point falls beyond the control limits or when a second point, not far from…”
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A single chart with supplementary runs rules for monitoring the mean vector and the covariance matrix of multivariate processes by Costa, Antônio F.B., Machado, Marcela A.G.

“…•We evaluate the performance of the MRMAX chart with supplementary runs rules.•The monitoring of the proposed chart is based on the sample means and sample…”
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Control charts for monitoring the mean vector and the covariance matrix of bivariate processes by Machado, Marcela A. G., Costa, Antonio F. B., Marins, Fernando A. S.

“…In this article, we propose new control charts for monitoring the mean vector and the covariance matrix of bivariate processes. The traditional tools used for…”
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A New Chart for Monitoring the Covariance Matrix of Bivariate Processes by Costa, Antonio F. B., Machado, Marcela A. G.

“…In this article we consider a control chart based on the sample variances of two quality characteristics. The points plotted on the chart correspond to the…”
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Performance Analysis of Interval Type-2 Fuzzy and R Control Charts by Túlio S. Almeida, Amanda dos Santos Mendes, Paloma M. S. Rocha Rizol, Marcela A. G. Machado

“…Statistical process control (SPC) is one of the most powerful techniques for improving quality, as it is able to detect special causes of problems in…”
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A side-sensitive synthetic chart combined with a VSS chart by Costa, Antonio FB, Machado, Marcela AG

“…In independent investigations, the variable sample size (VSS) scheme and the side-sensitive synthetic (SS) rule proved to reduce the delay with which the chart…”
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A side-sensitive synthetic chart combined with a VSS X‾ chart by Costa, Antonio F.B., Machado, Marcela A.G.

“…•We study the performance of the mean chart.•We consider the side-sensitive signaling rule.•We consider a variable sample size scheme with two sample sizes. In…”
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