数学建模美赛F题论文设计Word格式文档下载.docx
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数学建模美赛F题论文设计Word格式文档下载.docx
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T3
T4
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49365
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F
F1
F2
F3
F4
2016
MCM/ICM
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Summary
Ouranalysisandtargets:
Inessence,thisproblemiskindofacaseofmaximumflowandminimumconsumptionwithmultiplesourcesandtargets.“Multiplesources〞referstodifferentoriginalcountriesofrefugeesinvolvedinthecase,while“multipletargets〞referstodifferenttargetcountrieswhererefugeesarrive.It’souraimtorationalizetheflowsofrefugeesandtooptimizethetargetcountryforeachrefugee,i.e.tooptimizethechoiceoftransmittingroutesandtheallocationofavailableresourceswithvariousconditionfactors.
Thegeneralideaandmethod:
Setanindicatorwhichconsistsofdifferentpartsofdifferentfactors.Theindicatorisdesignedtoreflecttheseverityofbothtransportationandresourcesconsumption.Everysub-factorshouldinflectthegapbetweentheoreticalvalueandactualconditions.Fortheactualconditions,wecangetenoughdatatodescribeorestimateit.Asforthetheoreticalvalue,weintroducetheadvancedDijkstraalgorithminspiredbyEdmond-Karpalgorithm.Besides,weproposedtheconceptions:
weightingfactormatrix,resourcesfactormatrix,aseriessubfactormatriceswhichisdesignedtodescribetheeffectcausedbydifferentfactors.Theproblemisquitesimilartothemodelofwatersupplysystem.Soweusethesimilardefiningmethodtotackletheproblems.
Mainresultsandconclusions:
Themodelworkswellunderdynamicconditionsandtheresultsfittherealsituationwell,whilethefactorofpoliticsandthefactorofadjustmentscanbechangedthusitisabletoassessthecascadingeffects.ItishelpfulwhenthepopulationofrefugeesgrowsrapidlyandisabletomakepredictionofthemaximumcapacityofEuropeanmainlandtoconsumetheflowofrefugees.
Keypoints:
Maximumflowandminimumexpense/Watersupplynetworkmodel
Dijkstraalgorithm
UnstoppableRefugees
1Introduction
1.1Background
Asaresultofmajorpoliticalandsocialunrestandwarfare,amassivesurgeofrefugeesemigratingfromtheMiddleEasttoEuropeancountries.WithhundredsofthousandsofrefugeesmovingacrossEuropeandmorearrivingeachday,muchattentionhasbeengiventorefugeeintegrationpoliciesandpracticesinmanycountriesandregions.Thechallengesbroughtbytherefugeesmustbemanagedcarefullythrougheffectivepolicies.
1.2AnOverViewofTasks
1)Metricsofrefugeecrises.Developasetofmeasuresandparameterstofortherefugeecrisesassessment.
2)Flowofrefugees.Createamodelofoptimalrefugeemovementthatwouldincorporateprojectedflowsofrefugeesacrosssixtravelrouteswithconsiderationofseveralimportantfactors,liketransportations/accessibility,safetyandcountriescapacities.Determinethenumberofrefugeesandtherateofpointsofentry.Justifythenewelementsaddedinthemodelandanalyzethesensitivity.
3)Dynamicsofthecrisis.Refinethemodeltoadaptthedemandofchangingenvironmentalfactors.Herewehavetotakethecascadeeffectoftheresourceconsumptionintoconsideration.What’smore,aplanshouldbegiventoallocatetheresourceproperlyandrankthepriorityofdifferentkindofresources.AnalyzetheeffectsofNGOsandthenewdestinationsforrefugees.
4)Policytosupportrefugeemodel.Weareaskedtowriteareportonourmodelandproposeasetofpoliciesthatwillsupporttheoptimalpattern.Considerandprioritizethehealthandsafetyofrefugeesandlocalpopulations.TakethelawsandculturalconstraintsandroleofNGOSintoconsideration.
5)Exogenousevents.Analyzetheexogenousevents’influenceonthesituationparametersandthecascadingeffectoftherefugeeflows.Howyourplanisdesignedtoberesilienttotheseevents?
6)Scalability.DiscusstheScalabilityofyourmodelwhenyourmodelisappliedforamuchlargerscale
1.3OurGeneralAnalysisandWork
1.3.1Analysis:
Theindexforthecrisisassessmentshouldbeposedoftwoparts:
1)Theburdenoftherefugeetransitionforthecountryonthepath
2)Theburdenoftheresourceconsumptionforcountrieswithrefugees
Eachpartaboveshouldindicatethedifferencebetweenidealsituationsandpracticalones.
Thepracticalsituationcanbeknownorbeestimatedfromstatisticdata,soourfocusisthetheoreticoridealrefugeeflowpattern.
Theessenceofthisproblemiskindofacaseofmaximumflow(profit)andminimumconsu
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