简介:Tosimulatetherumorpropagationprocessononlinesocialnetworkduringemergency,anewrumorpropagationmodelwasbuiltbasedonactiveimmunemechanism.Therumorpropagationmechanismswereanalyzedandcorrespondingparametersweredefined.BAscalefreenetworkandNWsmallworldnetworkthatcanbeusedforrepresentingtheonlinesocialnetworkstructurewereconstructedandtheircharacteristicswerecompared.Agent-basedsimulationswereconductedonbothnetworksandresultsshowthatBAscalefreenetworkismoreconductivetospreadingrumorsanditcanfacilitatetherumorrefutationprocessatthesametime.Rumorspaidattentiontobymorepeopleislikelytospreadquickerandbroaderbutforwhichtherumorrefutationprocesswillbemoreeffective.Themodelprovidesausefultoolforunderstandingandpredictingtherumorpropagationprocessononlinesocialnetworkduringemergency,providingusefulinstructionsforrumorpropagationintervention.
简介:GivennverticesinaplaneandUCAVgoingthrougheachvertexonceandonlyonceandthencomingback,theobjectiveistofindthedirection(heading)ofmotionineachvertextominimizethesmoothpathofboundedcurvature.ThispaperstudiestheheadingsofUCAV.First,theoptimalheadingsfortwoverticesweregiven.Onthisbasis,ann-playertwo-strategygametheoreticmodelwasestablished.Inaddition,inordertoobtainthemixedNashequilibriumefficiently,nlinearequationsweresetup.Thesimulationresultsdemonstratedthattheheadingsgiveninthispaperareeffective.
简介:UMLisastandardmodelinglanguageusedinobject-orientedanalysisanddesign.Functionpointanalysisisamethodusedtomeasurethesizeofanapplication,Itisindependentoftheimplementationprogramminglanguage.Itsmeasuringresultcanbecomparedbetweendifferentdevelopmentprocesses.ThispaperpresentsamethodtousetherequirementsanalysismodelofUMLtoanalysistheapplication'sfunctionpoints,sosoftwaredevelopercanuseittoestimatetheproject'ssizeandcost.Animprovedmethodisgivenattheendofthispaper.
简介:Thecross-fertilizationbetweenartificialintelligenceandcomputationalfinancehasresultedinsomeofthemostactiveresearchareasinfinancialengineering.Onedirectionistheapplicationofmachinelearningtechniquestopricingfinancialproducts,whichiscertainlyoneofthemostcomplexissuesinfinance.Intheliterature,whentheinterestrate,themeanrateofreturnandthevolatilityoftheunderlyingassetfollowgeneralstochasticprocesses,theexactsolutionisusuallynotavailable.Inthispaper,weshallillustratehowgeneticalgorithms(GAs),asanumericalapproach,canbepotentiallyhelpfulindealingwithpricing.Inparticular,wetesttheperformanceofbasicgeneticalgorithmsbyusingittothedeterminationofpricesofAsianoptions,whoseexactsolutionsisknownfromBlack-Scholesoptionpricingtheory.Thesolutionsfoundbybasicgeneticalgorithmsarecomparedwiththeexactsolution,andtheperformanceofGAsisewluatedaccordingly.Basedontheseewluations,somelimitationsofGAsinoptionpricingareexaminedandpossibleextensionstofutureworksarealsoproposed.
简介:Thispaperproposesasupervisedtraining-testmethodwithGeneticProgramming(GP)forpatternclassification.Comparedandcontrastedwithtraditionalmethodswithregardtodeterministicpatternclassifiers,thismethodistrueforbothlinearseparableproblemsandlinearnon-separableproblems.Forspecifictrainingsamples,itcanformulatetheexpressionofdiscriminatefunctionwellwithoutanypriorknowledge.Atlast,anexperimentisconducted,andtheresultrevealsthatthissystemiseffectiveandpractical.
简介:Itiswellknownthatthetransientbehaviorsofthetraditionaladaptivecontrolmaybeverypooringeneral,andthattheadaptivecontroldesignedbasedinswitchingbetweenmultiplemodelsisanintuitivelyappealingandpracticallyfeasibleapproachtoimprovethetransientperformances.Inthispaper,weshallprovethatforatypicalclassoflinearsystemsdisturbedbyrandomnoises,themultiplemodelbasedleast-equares(LS)adaptiveswitchingcontrolisstatbleandconvergentandhasthesameconvergencerateasthatestablishedforthestandardleast-squares-basedself-tunningregulators.Moreover,themixedcasecombiningadativemodelswithfixedmodelsisalsoconsidered.
简介:Basedonthesystemdynamics(SD)model,thispaperputsforwardaquantitativemethodtoevaluatetheearthquakeemergencyplaninChina.Firstly,weanalyzethedisastersystemstructureandthecontentofplan.Usingtheanalysisresults,weestablishasystemdynamics(SD)modelandthencarryoutitssimulation.Accordingtothesimulationresults,therescueeffectusingtheplanof2012isbetterthanthatof2006.Fromthepolicylevel,inordertoreduceloss,governmentshouldmaintaincommunicationsmoothly,improvetheabilityofselfandmutualhelp,strengthenthemanagementofpublicopinion,andpaymoreattentiontosecondarydisasters.
简介:Thispaperpropos-nologyintermsofthecharactersofagriculturaldecisionsupport,anddesignsamodelofDSSaboutproductionandsalesofagriculturalproducts.Themodeladoptsdecentralized+centralizeddistributednetworktopology.Inthedistributednetwork,eachnodeisaDSS.EveryDSSismadeupofmultipleagents,whichcanenhancetheinteractivityandintel-lectualityamongDSS.Inthemulti-agentsystem,weembedontologyintheagentsystem,whichhasthefollowingadvantages:enhancingthecoordinationandcommunicationbetweenagents,andstrengtheningthesemanticsofinformationandimprovingknowledgeshareandreuse.