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A Study on a Control Model for the Diagnostic and Nonconformity Rate in an Instrumental Process Involving Autocorrelation  

Koo, Ja-Hwal (Department of Industrial and Systems Engineering, Kumoh National Institute of Technology)
Cho, Jin-Hyung (Department of Industrial and Systems Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of Korean Society of Industrial and Systems Engineering / v.33, no.1, 2010 , pp. 33-40 More about this Journal
Abstract
Because sampling interval for data collection tends to be short compared with the overall processing time, in chemical process, instrumental process related tanks or furnace collected data have a significant autocorrelation. Insufficient control technique and frequent control actions cause unstable condition of the process. Traditional control charts which were developed based on iid (independently and identically distributed) among data cannot be applied on the existence of autocorrelation. Also unstable process is difficult to identity or diagnose. Because large-scale process has a lot of measurable variables and multi-step-structures among data, it is difficult to find relation between measurable variables and nonconformity. In this paper, we suggested an appicable model to diagnose the process and to find relation between measurable variables (CTQ) and nonconformity in the process having autocorrelation, unstable condition frequently, a lot of measurable variables, and multi-step-structure. And we applied this model to real process, to verify that the process engineers could easily and effectively diagnose the process and control the nonconformity.
Keywords
Intstrumental Process; Autocorrelation; CTQ(Critical to Quality); Nonconformity; Multi-Step-Structure;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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