Monitoring Saccharification Process  in Brewery Industry Using  Quality Control Charts

This paper analyzes the effect of subgroup size on the x-bar chart characteristics using sample influx (SIF) into forensic science laboratory (FSL). The characteristics studied include changes in out-or-control points (OCP), upper control limit UCL x , and zonal demarcations. Multi-rules were used to identify the number of out-of-control-points, N ocp as violations using five control chart rules applied separately. A sensitivity analysis on the N ocp was applied for subgroup size, k, and number of sigma above the mean value to determine the upper control limit, UCL x . A computer code was implemented using a FORTRAN code to create x-bar control-charts and capture OCP and other control-chart characteristics with increasing k from 2 to 25. For each value of k, a complete series of average values, Q(p), of specific length, N sg , was created from which statistical analysis was conducted and compared to the original SIF data, S(t). The variation of number of out-of-control points or violations, N ocp , for different control-charts rules with increasing k was determined to follow a decaying exponential function, N ocp = Ae −α , for which, the goodness of fit was established, and the R 2 value approached unity for Rule #4 and #5only. The goodness of fit was established to be the new criteria for rational subgroup-size range, for Rules #5 and #4 only, which involve a count of 6 consecutive points decreasing and 8 consecutive points above the selected control limit (σ/3 above the grand mean), respectively. Using this criterion, the rational subgroup range was established to be 4 ≤ k ≤ 20 for the two x-bar control chart rules.

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Monitoring Saccharification Process in Brewery Industry Using Quality Control Charts

Cited by 2 publications

References 17 publications

Partially consolidated bioprocessing of mixed lignocellulosic feedstocks for ethanol production

Partially consolidated bioprocessing of mixed lignocellulosic feedstocks for ethanol production

Analysis of the Effect of Subgroup Size on the X-Bar Control Chart Using Forensic Science Laboratory Sample Influx Data

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