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简介：BasedonthecurrentsituationofChinaConstructionBIMtechnology,thisarticlediscussedtherequirementofBIMapplicationsinconstructionphase.BytheintroductionofPKPMBIM-basedConstructionManagementPlatform,themeaningoftheplatformapplicationwasrevealed.Finally,twoapplicationcaseswereshowntoexplainplatform’svalueandprospect.

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简介：APIsofCADsystemcouldbeencapsulatedtoconstructwebservicessoastoprovidestandardaccessinterfacesforweb-basedcooperativedesign.However,lackofsemanticsupportingmakeintegrationofheterogeneousmodellingsystemlimitedtooperationallevel.Onthepurposeofcarryingoutcooperativedesigninaflexiblecloudenvironment,anintelligentandeffectivesupportmechanismisneededformassandcomplexinteractionincooperativework.Therefore,Ontology-basedGeometryModelingServicesEnvironment(OGMSE)isprovidedtorealizeaknowledge-levelgeometrymodelingsoastosupportedsemantic3Dmodelmanagementandintelligentoperationsupport.First,CADAPIsareencapsulatedintowebserviceforwebinvocation.Then,ontologycontainedstructuralsemanticandoperationalsemanticisbuiltformanagementofmodelsandmodelingprocess.Lastly,conception-drivenmodelingmechanismisbuilttoinvocateserviceaccordingtointeractionrequirement,thustorealizeconception-levelcooperativedesign.Basedonanopengeometryengine,aprototypesystemhasbeendeveloped.Theresultshowsthattheapproachprovidesareferencedirectionforlarge-scaleapplicationonthenetwork.

简介：ThispaperintroducesthePKPM-BIMconstructionmanagementplatformanditsapplicationsintheconstructionsecuritymanagement.ThePKPM-BIMplatformisanintegratedmanagementsystemmainlydevelopedforthecontractorstoimplementtheBIM-aidedconstructionmanagement.ApplicationofBIMtechnologywouldbringmanybeneficialchangestothesecuritymanagementinconstruction.

简介：Thispaperdiscussestheproblemthatconstructingacurvetosatisfythegivenendpointconstraintsandchord-lengthparameters.BasedontheresearchofLu,thecurveconstructionmethodfortheentiretangentanglesregion01(α,α)∈(-π,π)×(-π,π)isgiven.Firstly,toensuretheweightsarealwayspositive,thethreecharacteristicsofcubicrationalBeziercurveisproved,thenthesegmentconstructionideafortheothertangentanglesarepresentedinviewofthethreecharacteristics.Thecurveconstructedwiththenewmethodsatisfiestheendpointconstraintandchord-lengthparameters,it'sG1continuousineverysegmentcurve,andtheshapesofthecurvearewell.