Abstract—This study optimized the performance of plastic extrusion process of drip irrigation pipes using fuzzy goal programming. Two main responses were of main interest; roll thickness and hardness. Four main process factors were studied. The L18 array was then used for experimental design. The individualmoving range control charts were used to assess the stability of the process, while the p...

Standard control chart practice assumes normality and uses estimated parameters. Because of the extreme quantiles involved, large relative errors result. Here simple corrections are derived to bring such estimated charts under control. As a criterion, suitable exceedance probabilities are used.

In this paper we show our results of analysing a real-life event log taken from a Dutch financial institute. The log contains 262.000 events and describes a personal loan application process. We mine the control-flow model using the fuzzy miner from the process mining tool Disco, and analyse different variants of the process statistically and with dotted charts. This allows us to conclude perfo...