網(wǎng)絡(luò)病毒傳播模型及兩階段動態(tài)免疫策略研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文網(wǎng)絡(luò)病毒傳播模型及兩階段動態(tài)免疫策略研究姓名：陶智飛申請學(xué)位級別：碩士專業(yè)：計算機(jī)軟件與理論指導(dǎo)教師：韓宗芬20060507華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文IIAbstractwkvirusesareagreatthreattothecomputerwks.Thetremendousflowsarousedbythemwillcongestthewkcooperatedwithhackersthe

2、ywillbecomemedangerous.Traditionalantivirustechniquesfocusonprotectionofindividualratherthanthewkalsotheynearlycoulddonothingtostopthedenialofserviceattackarousedbytheepidemics.Apparentlythewkvirusesarefarbeyondusinthisr

3、acegameweneedmeeffectivecountermeasurestostrikebacktheviruses.Someepidemicsmodelsareproposedtodescribetheviralpropagationhoweversomeoftheassumptionsinthemarenotreasonableinthecomputerwk.Computerwkvirusescanonlyspreadbetw

4、eenthosenodeswhichhaveactualcontactanodewillbeinfectedonlywhensomeofitsneighbsareinfectiveaninfectedonewillnevergetrecoveredwithoutmanualimmunization.WeproposetheDynamicSusceptibleInfectiousRecovered(DSIR)modeltoovercome

5、suchshtcomingsalsotheimmunizationdelaytheeffectofthewktopologyontheepidemicsareintroduced.Theviruspropagationisdividedintotwophase:inthefirstphasenoimmunizationexiststhesusceptiblenodesareinfectedinthesecondphasetheimmun

6、izationisemployedsothatthesusceptibleinfectiousnodesarerecovered.ThestaticimmunizationstrategiesareevaluatedbasedontheDSIRmodel.Boththeanalysisthesimulationshowsthattheefficiencyofthetargetedimmunizationdecreasessharplyw

7、ithtimegapbetweenthevaccinesepidemicsconsidered.Targetedimmunizationcouldnotsuppresstheepidemicasefficientastheresultsgotbefe.Weproposeatwophaseimmunizationstrategy(TPS)tosuppressthecomputerwkepidemicsbythespreadingofvac

8、cines.Duringthetwophasesthevaccineswillgoupthedegreesequenceinphaseonedownthesequenceinphasetwosotheimptantnodesareprotectedtherevisitrateofthevaccinesisreduced.Itiscompletelydecentralizedexploitsthepowerlawdistributioni

9、nthenodedegreeuseslocalinfmationsuchastheidentitiesconnectivityofanodesneighboursbutnotthetargetsglobalposition.Wealsoevaluatetheefficiencythecostofthetwophasestrategyonthescalefreewkhierarchywk.Theexaminationcircumstanc