?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F157%2F&rft.title=Optimal+Control+for+Multi-variable+Problems&rft.creator=Palacios%2C+Luz&rft.creator=Aggarwala%2C+Rita&rft.subject=Materials&rft.subject=None%2FOther&rft.description=Chemex+Laboratories+measures+concentrations+of+various+minerals+in+land+samples+provided+by+their+clients.+The+problem+presented+by+Chemex+is+that+they+would+like+to+be+able+to+detect+when+their+measurement+apparatus+needs+re-calibration+due+to+a+shift+in+process+parameters%2C+so+as+to+minimize+rework.%0A%0AThree+very+contrasting+approaches+to+the+problem+were+taken+during+the+workshop.+They+are%3A+considering+the+process+as+a+Markov+Chain%3B+use+of+Bayesian+Belief+Networks%3B+and+Multivariate+control+chart+implementation.+Preliminary+data+analysis+for+data+provided+by+Chemex+was+also+performed+in+order+to+initially+assess+some+of+the+models+considered.&rft.date=1999&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F157%2F1%2Fquality_control.pdf&rft.identifier=++Palacios%2C+Luz+and+Aggarwala%2C+Rita++(1999)+Optimal+Control+for+Multi-variable+Problems.++%5BStudy+Group+Report%5D+++++