the delft system approach and agent based modelling

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1、TheDelftSystemApproachandAgentBasedModelling;Dotheyneedeachother?M.J.P.M.SteinhageMechanicalEngineeringProductionEngineeringandLogistics2009AbstractInadynamicworldstaticmodelsareprobablynotsufficientforthemorecomplexsimulations.Thisisthereasonwhythisliteraturereview

2、ismadetoseeiftherearenewtechniqueswhichcanbeincludedintheDSAtomodelevenmorecomplexsystems.TheDelftSystemApproach(DSA)isanidealmethodofmodellingonafastandeffectivewaystaticandwellunderstoodproblems.BecausetheDSAmakessmartuseofblack-boxesandcaneasilyzoominoroutinthedi

3、fferentstrata.ButwhenamoredetailedmodelisneededofacomplexsystemwithdynamicalbehaviortheDSAispushedbeyonditslimits.ThisiswherethepossibilitiesofAgentBasedModelling(ABM)arefullyused.Thisisamodellingtechniquebasedonagents,thefunctions,whichhavecontrarytotheDSApossibili

4、tiestocopewithadynamicstructurebehaviouranddecentralizedcontrol.Whentheagentsaredefinedrightpossiblesolutionscanemergeasaresultofthereactionsbetweenthedifferentagentswiththeseresultsthebestdirectionforthesystemtodevelopisdetermined.Tovisualizethis,theseresultsareoft

5、enplottedinsocalledfitnesslandscapes;thesecangiveaninsightinhowthemostfeasiblesolutionwaspicked.Forthestaticmodels,thissolutionwillbethesamefoundwiththeDSA,butwhenthesystemiscomplexanunforeseen,bythemodeler,solutioncouldemerge.Thisisbecauseofthelimitationsamodelerha

6、s.Themodelandalsoitssolutioncan’tbemorecomplexthantheuser.ThemaingoalofthisliteraturereviewisthesearchforpapersinwhichcomplexsystemsaremodelledwiththeuseofABMandtofindoutifthesesystemsaremorecomplexthantheonesthatcanbemodelledwiththeDSAThiswillhopefullyopentheeyesof

7、theusersofthedifferentparadigmsbecausevisionsandtechniquesthatgivethemodelermorepossibilitiesorthepossibilitytomodelsomethingwhichwasimpossibletomodelbeforearealwaysgood.AfterasummaryoftheDSAandABMtechniquethreepapersarediscussedthoroughlyandconclusionsaredrawnfromt

8、hesepapers.TheconclusionreachedisthattheDSAisawelldefinedtechniquewithalogicaldefinitionssystembutthatsomeoftheconclusionsarebasedonoutdat