Independent component analysis process monitoring

J-M Lee, CK Yoo, and I-B Lee. Statistical process monitoring with independent components analysis. J. Process Control, 14 467-485, 2004. 

For safety and good product quality of process plant, it is important to monitor process dynamic operation and to detect upsets, abnormalities, malfunctions, or other unusual events as early as possible. Since first principle models of complicated chemical processes are in many circumstances difficult to develop, data based approaches have been widely used for process monitoring. Among them, the principle component analysis (PCA) extracts a number of independent components ftom highly correlated process data, has been applied successfully for process monitoring. 

A very important feature in the disposal process is the monitoring of materials to determine and confirm radioactivity levels, particularly where material is to be free-released as non-radioactive. Detailed procedures have been developed, agreed with the appropriate independent regulators, implemented and demonstrated. These include detailed monitoring of individual components and bulk monitoring, and confirmatory checks using gamma spectroscopy equipment and detailed radiochemical analysis. 

Aerospace has continued to provide many engineering, design, and safety services to the Air Force for more than 40 years. One of its chief functions is to perform launch verification and readiness assessments for all Air Force space launches. Aerospace s launch verification procedure is veiy broad, beginning with analysis of launch system design. Aerospace independently tests physical components and software, checks manufacturing processes, and verifies correct assembly of the launch vehicle. Finally, Aerospace delivers a formal launch verification letter to the Air Force s Space and Missile Systems Center, monitors the launch, and analyzes launch and post-launch data (Tomei, 2003). All of the functions are redundant in the sense that Air Force and contractor personnel also perform most of the same functions. Aerospace s launch verification serves as an independent, objective assessment of launch safety that the Air Force uses in conjunction with its own analyses in making launch decisions. 

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