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1、HindawiPublishingCorporationMathematicalProblemsinEngineeringVolume2012,ArticleID430785,14pagesdoi:10.1155/2012/430785ResearchArticleStudyontheRoadNetworkConnectivityReliabilityofValleyCityBasedonComplexNetworkYong-ShengQian,1MinWang,1Hong-XiaKang,2Jun-WeiZeng,1andYu-FeiLiu11SchoolofTraffican
2、dTransportation,LanzhouJiaotongUniversity,Lanzhou730070,China2TaiyuanRailwayBureauPartySchool,Taiyuan030013,ChinaCorrespondenceshouldbeaddressedtoYong-ShengQian,qianyongsheng@mail.lzjtu.cnReceived8May2012;Revised30August2012;Accepted10September2012AcademicEditor:WuhongWangCopyrightq2012Yong
3、-ShengQianetal.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited.Basedontheresearchprogressinrelatedfieldsandthedistributioncharacteristicsofroadnetworksinva
4、lleycities,thecomplexnetworkmodelofacityroadnetworkisestablishedtostudyitsconnectivityreliability.TakingLanzhouastheexample,severalparametersofthecomplexnetworkabstractedfromtheroadnetworkarecalculatedandthepracticalmeaningsofthemaredescribed,respectively.Onthisbasis,throughcomputingtheglob
5、alefficiencyandtherelativesizeofthelargestconnectingsubgraphunderintentionalattacksandrandomattacks,respectively,thecurvesoftheabovetwoparametersvaryingwiththeattackingtimesaredrawn.ThedetailedinvestigationofconnectivityreliabilityofLanzhouroadnetworkisdonebyanalyzingthecurves’tendency.Finall
6、y,wefindthatthenetworkofavalleycityhasapoorconnectionandhasalotofdeadends.Besides,theaveragelengthoftheroadsisverylongandtheholisticconnectivityreliabilityisatalowerlevel;thesearesuitabletothegroup-typedistributionofvalleycity’sroadnetwork,andtheconnectivityreliabilityoftheroadnetworkisstron
7、gerunderrandomattacksthanthatunderintentionalattacks.1.IntroductionSincethereformandopeningupofChina,theurbanizationprocesshasbeenacceleratedgreatly,whichrequirestheurbanroadsystemtomeettherequirementsoftherapiddevelopmentofcities.However,duetothelimitat
