Show simple item record

dc.contributor.authorAdams, Kevin Pageen_US
dc.date.accessioned2014-03-14T20:06:30Z
dc.date.available2014-03-14T20:06:30Z
dc.date.issued2005-12-12en_US
dc.identifier.otheretd-01042006-134224en_US
dc.identifier.urihttp://hdl.handle.net/10919/25943
dc.description.abstractEfficient operation of a dynamic system requires (near) optimal real-time control decisions. Those decisions depend on a set of control parameters that change over time. Very often, the optimal decision can be made only with the knowledge of future values of control parameters. As a consequence, the decision process is heuristic in nature. The optimal decision can be determined only after the fact, once the uncertainty is removed. For some types of dynamic systems, the heuristic approach can be very effective. The basic premise is that the future values of control parameters can be predicted with sufficient accuracy. We can either predict those value based on a good model of the system or based on historical data. In many cases, the good model is not available. In that case, prediction using historical data is the only option. It is necessary to detect similarities with the current situation and extrapolate future values. In other words, we need to (quickly) identify patterns in historical data that match the current data pattern. The low sensitivity of the optimal solution is critical. Small variations in data patterns should affect minimally the optimal solution. Resource allocation problems and other â discrete decision systemsâ are good examples of such systems. The main contribution of this work is a novel heuristic methodology that uses neural networks for classifying, learning and detecting changing patterns, as well as making (near) real-time decisions. We improve on existing approaches by providing a real-time adaptive approach that takes into account changes in system behavior with minimal operational delay without the need for an accurate model. The methodology is validated by extensive simulation and practical measurements. Two metrics are proposed to quantify the quality of control decisions as well as a comparison to the optimal solution.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartAdamsDissertationETDUpdate.pdfen_US
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectResiliencyen_US
dc.subjectPolicy-based Backupen_US
dc.subjectNeural Networksen_US
dc.subjectDynamic Optimizationen_US
dc.subjectControl Theoryen_US
dc.subjectPredictionen_US
dc.titleAn Approach to Real Time Adaptive Decision Making in Dynamic Distributed Systemsen_US
dc.typeDissertationen_US
dc.contributor.departmentComputer Scienceen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineComputer Scienceen_US
dc.contributor.committeechairGracanin, Denisen_US
dc.contributor.committeememberBohner, Shawn A.en_US
dc.contributor.committeememberBouguettaya, Athmanen_US
dc.contributor.committeememberTriantis, Konstantinos P.en_US
dc.contributor.committeememberArthur, James D.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01042006-134224/en_US
dc.date.sdate2006-01-04en_US
dc.date.rdate2006-01-20
dc.date.adate2006-01-20en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record