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.
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Showing 1 to 11 of 11 for “"Time-to-Signal"”.
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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 …
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Evaluation of Scan Methods Used in the Monitoring of Public Health Surveillance Data
… in public health surveillance and disease monitoring has grown tremendously. There is an abundance of data available in all sorts of forms. Hospitals, federal and local governments, and industries are all collecting data and developing new methods to be used in the detection of anomalies. Many …
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An optimization of on-line monitoring of simple linear and polynomial quality functions
<p>This research aims to introduce a number of contributions for enhancing</p> <p>the statistical performance of some of Phase II linear and polynomial profile monitoring techniques.</p> <p>For linear profiles the idea of variable sampling size (VSS) and variable</p> <p>sampling interval (VSI) have …
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Aptamer-based sequence verification platform for rapid multiplexed detection of viral RNA targets
Diagnostic detection of viruses is a cornerstone method for the management of emerging epidemics and pandemics. However, current limitations in commercially available and gold standard diagnostic detection platforms like cost, time to signal readout, and sensitivity, expose gaps in viral …
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Multivariate control charts for the mean vector and variance-covariance matrix with variable sampling intervals
When using control charts to monitor a process it is frequently necessary to simultaneously monitor more than one parameter of the process. Multivariate control charts for monitoring the mean vector, for monitoring variance-covariance matrix and for simultaneously monitoring the mean vector and the …
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GLR Control Charts for Process Monitoring with Sequential Sampling
The objective of this dissertation is to investigate GLR control charts based on a sequential sampling scheme (SS GLR charts). Phase II monitoring is considered and the goal is to quickly detect a wide range of changes in the univariate normal process mean parameter and/or the variance parameter. …
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The Design of GLR Control Charts for Process Monitoring
… for two types of statistical process monitoring (SPC) problems. The first part of this dissertation considers the problem of monitoring a normally distributed process variable when a special cause may produce a time varying linear drift in the mean. The design and application of a GLR …
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Control charts applying a sequential test at fixed sampling intervals with optional sampling at fixed times
… have been intensively investigated. In contrast to traditional fixed sampling interval (FSI) control charts, VSI charts vary the sampling interval as a function of the data. VSI charts detect many process changes faster than their FSI counterparts. A disadvantage, however, of VSI charts as …
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GLR Control Charts for Monitoring Correlated Binary Processes
When monitoring a binary process proportion p, it is usually assumed that the binary observations are independent. However, it is very common that the observations are correlated with p being the correlation between two successive observations. The first part of this research investigates the …
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X control charts in the presence of correlation
… 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 indication that the process is operating off …
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Process Monitoring with Multivariate Data:Varying Sample Sizes and Linear Profiles
Multivariate control charts are used to monitor a process when more than one quality variable associated with the process is being observed. The multivariate exponentially weighted moving average (MEWMA) control chart is one of the most commonly recommended tools for multivariate process …