简介：Thedesignandoperationofhighvolumeconveyorsystemsindistributioncentersareimportantduetoitshighcost,largefootprintandcriticalroleinthesystem.However,thereisnoanalyticalmodelavailable.Inthispaper,westudythecharacteristicsoftheconveyorsortationsystem,developagenericmodelofacomplexconveyornetwork.WethenusetheDelayandStockabstractiontodevelopanapproximateanalyticalmethodusingsamplepathanalysisanddynamicnetworkflowmodel.Thedecisionvariablesincludelengthofaccumulationsegmentsandthespeedsofconveyorcomponentsaforementioneddecisionvariables.Thisanalyticalsolutionprovidesfasteranalysis,insightsandusefulsubgradientwithrespecttothedecisionvariables.

简介：Thebullwhipeffectisstudiedfortwo-levelsupplychainwithmulti-distributedcenters.Firstthemodelfortwo-levelsupplychainwithmulti-distributedcentersisestablishedundersomeassumptions,thenthemathematicaldescriptionisgivenforit.Finallyasimpleexampleisshowedtoillustratetheresultsobtainedinthepaper.