Results 91 to 100 of about 4,509 (203)

Optimal Design of One-Sided Exponential EWMA Charts With Estimated Parameters Based on the Median Run Length

IEEE Access, 2019
One-sided exponential exponentially weighted moving average (EWMA) charts are useful tools for monitoring high-quality processes. Average run length ($ARL$ ) is usually used as the only criterion to evaluate the performance of a control chart.
Yulong Qiao, Xuelong Hu, Jinsheng Sun, Qin Xu   +3 more
doaj   +1 more source

Multivariate Statistical Process Control Charts: An Overview [PDF]

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, Panaretos, John, Psarakis, Stelios   +2 more
core   +1 more source

An application of control charts in manufacturing industry [PDF]

, 2012
The range control chart and the X bar control chart are the well known and the most popular tools for detecting out- of-control signals in the Statistical Quality Control (SQC). The control charts has shown his worth in the manufacturing industry.
Muhammad, Faqir, Riaz, Muhammad
core  

Adaptive EWMA Control Charts with a Time Varying Smoothing Parameter [PDF]

, 2015
It is known that time-weighted charts like EWMA or CUSUM are designed to be optimal to detect a specific shift. If they are designed to detect, for instance, a very small shift, they can be inefficient to detect moderate or large shifts.
Sánchez, Ismael, Ugaz Sánchez, Willy Ericson   +1 more
core   +1 more source

Monitoring process mean with a new EWMA control chart Um novo gráfico de controle EWMA para monitoramento da média de processo

Production, 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.
Yang Su-Fen, Tsai Wen-Chi, Huang Tzee-Ming, Yang Chi-Chin, Cheng Smiley   +4 more
doaj  

New extended exponentially weighted moving average control chart for monitoring process mean

Heliyon
In 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
doaj   +1 more source

Monitoring of the BTA Deep Hole Drilling Process Using Residual Control Charts [PDF]

Deep hole drilling methods are used for producing holes with a high lengthto- diameter ratio, good surface finish and straightness. The process is subject to dynamic disturbances usually classified as either chatter vibration or spiralling. In this work,
Hering, Franz, Messaoud, Amor, Theis, Winfried, Weihs, Claus   +3 more
core  

Application and Use of Multivariate Control Charts In a BTA Deep Hole Drilling Process [PDF]

Deep hole drilling methods are used for producing holes with a high length-to-diameter ratio, good surface finish and straightness. The process is subject to dynamic disturbances usually classified as either chatter vibration or spiralling. In this paper,
Hering, Franz, Messaoud, Amor, Theis, Winfried, Weihs, Claus   +3 more
core  

A Novel Moving Average–Exponentiated Exponentially Weighted Moving Average (MA-Exp-EWMA) Control Chart for Detecting Small Shifts

Mathematics
Process monitoring plays a vital role in ensuring quality stability, and, operational efficiency across fields such as manufacturing, finance, biomedical science, and environmental monitoring.
Jun-Hao Lu, Chang-Yun Lin
doaj   +1 more source

Adaptive EWMA control chart for monitoring the coefficient of variation under ranked set sampling schemes. [PDF]

Sci Rep, 2023
Riaz A, Noor-Ul-Amin M, Emam W, Tashkandy Y, Yasmeen U, Rahimi J.   +5 more
europepmc   +1 more source