Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 1115 for “"charts"”.
-
CUSUM Generalized Variance Charts
<p>The commonly recommended charts for monitoring the mean vector are affected by a shit in the covariance matrix. As in the univariate case, a chart for monitoring for a change in the covariance matrix should be examined first before examining the chart used to monitor for a change in the mean …
-
Control Charts with Missing Observations
Traditional control charts for process monitoring are based on taking samples from the process at regular time intervals. However, it is often possible in practice for observations, and even entire samples, to be missing. This dissertation investigates missing observations in Exponentially Weighted …
-
Variable sampling interval control charts
Process control charts are widely used to display sample data from a process for purposes of determining whether a process is in control, for bringing an out-of-control process into control, and for monitoring a process to make sure that it stays in control. The usual practice in maintaining a …
-
Economic Design of CUSUM Control Charts
In statistical process control, control charts are one tool for monitoring the control status of a process. One such type of chart is the cumulative sum (CUSUM) chart which has advantages over other styles of control chart. A study of the economic design of CUSUM control charts is undertaken via a …
-
Multi-Sincronização em menssage sequence charts
Message Sequence Charts (MSC) é uma linguagem gráfica, usada na academia e na indústria, cujo objetivo é descrever o comportamento de componentes de sistemas e seus ambientes. A sintaxe e a semântica de um diagrama MSC padrão são definidos pelo International Telecommunication Union. A motivação …
-
Variable sampling in multiparameter Shewhart charts
… deals with the use of Shewhart control charts, modified to have variable sampling intervals, to simultaneously monitor a set of parameters. Fixed sampling interval control charts are modified to utilize sampling intervals that vary depending on what is being observed from the data. Two …
-
Quality control charts under random fuzzy measurements
We consider statistical process control charts as tools that statistical process control utilizes for monitoring changes; identifying process variations and their causes in industrial processes (manufacturing processes) and which help manufacturers to take the appropriate action, rectify problems …
-
Electronic tools for designing charts and graphs
This thesis explores the issues involved in designing an interactive chart and graph making system, especially tailored to the needs of the graphic designer. It defines a set of user interface requirements and describe the implementation of the prototype software system.
-
GLR Control Charts for Monitoring a Proportion
The generalized likelihood ratio (GLR) control charts are studied for monitoring a process proportion of defective or nonconforming items. The type of process change considered is an abrupt sustained increase in the process proportion, which implies deterioration of the process quality. The …
-
Multivariate nonparametric control charts using small samples
… nonparametric statistics could be used. Control charts based on the sign and signed rank statistics are explored. Past sample information for each variable is retained through an exponentially weighted moving average statistic (EWMA) in order to increase the sensitivity of the charts to detect …
-
Automated interpretation of digital images of hydrographic charts.
… generation of a digital database of hydrographic charts is presented. Low level processing of digital images of hydrographic charts provides image line feature segments which serve as input to a semi-automated feature extraction system, (SAFE). This system is able to perform a great deal of the …
-
Cumulative sum quality control charts design and applications
Classical Statistical Process Control Charts are essential in Statistical Control exercises and thus constantly obtained attention for quality improvements. However, the establishment of control charts requires large-sample data (say, no less than I 000 data points). On the other hand, we notice …
-
Cumulative Sum Control Charts for Censored Reliability Data
… ratio based cumulative sum (CUSUM) control charts for censored lifetime data with non-normal distributions. We illustrate the development and implementation of the charts, and we evaluate their properties through simulation studies. We address the problem of interval censoring, and we …
-
Application of control charts to small lot acceptance
… in acceptance tests. The use of control charts in production acceptance tests by the Government can provide: 1. additional confidence in lot acceptance because additional information is available 2. valuable information feedback to the design engineer and contractor for the resolution of …
-
Applications of Control Charts in Medicine and Epidemiology
We consider two applications of control charts in health care. The first involves the comparison of four methods designed to detect an increase in the incidence rate of a rare health event, such as a congenital malformation. A number of methods have been proposed: among these are the Sets method, …
-
X control charts in the presence of correlation
In traditional quality control charts, fixed sampling interval (FSI) schemes are used where the time between samples has fixed intervals. More efficient methods called variable sampling interval (VSI) schemes have been developed where one takes the next observation sooner than usual if there is an …
-
GLR Control Charts for Monitoring Correlated Binary Processes
… shifted values are known. We apply two CUSUM-pp charts as a chart combination to detect increases in p and increases or decreases in p. The GLR-pp chart with an upper bound on the estimate of p, and an upper bound and a lower bound on the estimate of p works well when the shifts are unknown. We …
Page 1 of 56