简介：

简介：

简介：摘要：依据第六届全国大学生工程训练综合能力竞赛的要求，本文针对“ S”型赛道常规赛中无碳小车所需要完成的任务，利用 proe三维软件进行仿真，设计并制作了空间四连杆机构的“ S”型无碳小车，并针对在调试过程中所经常遇到的微调连杆难以固定的问题，提出了用微分头微调的方法，以求小车能够按照预定的轨迹，安全、可靠、稳定的运行。

简介：Thispaperconstructedportfoliosaccordingtothegrowthratesandtheirstabilityoffirm'stotalstockholders'equitypershareandnetincomepershare,usingallthefirms'informationofShanghaiA-sharemarket.Wefoundthatthemarketexhibitssomeoverreactiontothegrowthraieoffirm'snetincomepershare,andisn'tsensitivetothestabilityoffirm'sgrowthrates.

简介：

简介：文章试图从认同视角扩展了社会相变的阐释,并提出了国际体系存在相变的可能性假设。

简介：ThemainpurposeofthispaperistostudyaproblemrelatedtoGolomb'sconjectures,andgiveaninterestingasymptoticformula.

简介：

简介：ＡＮＥＦＦＩＣＩＮＴＩＭＰＬＥＭＥＮＴＡＴＩＯＮＯＦＭＥＲＲＩＬＬ＇ＳＭＥＴＨＯＤＹＡＮＧＢｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｎａｇｅｍｅｎｔＥｎｇｉｎｅｅｒｉｎｇＨａｒｂｉｎＥｎｇｉｎｅｅｒｉｎｇＵｎｉｖｅｒｓｉｔｙＨａｒｂｉｎ１５０００１）Ａｂ...

简介：Let■Ω=Γ=Γ1+Γ2（seeFig.1）,meas（Γ1）>0,V={v|v∈H1（Ω）,v|Γ1=0},andV0={ω|Δω=hinΩ,ω|Γ=0,（?）h∈V}.LetV0′=thedualspaceofV0,a（u,v）=∫Ω▽u·▽Δvdx,andF（v）=∫Ωfvdx+∫Γ2g1Δvds-∫Γg2（?）ds,f∈V′0,g1∈H-（1/2）（Γ2）,g2∈H-（3/2）（Γ）.Considerthevariationalproblem:findu∈Vsuchthata（u,v）=F（v）,（?）v∈V0.（1）UsingTartar’slemma,weprovethatforproblem（1）thereexistsauniqueu∈Vsatisfying■

简介：

简介：

简介：

简介：Inthiseraofadata-drivensociety,usefuldata(BigData)isoftenunintentionallyignoredduetolackofconvenienttoolsandexpensivesoftware.Forexample,weblogfilescanbeusedtoidentifyexplicitinformationofbrowsingpatternswhenusersaccesswebsites.Somehiddeninformation,however,cannotbedirectlyderivedfromthelogfiles.Wemayneedexternalresourcestodiscovermoreknowledgefrombrowsingpatterns.Thepurposeofthisstudyistoinvestigatetheapplicationofwebusageminingbasedonweblogfiles.Theoutcomeofthisstudysetsfurtherdirectionsofthisinvestigationonwhatandhowimplicitinformationembeddedinlogfilescanbeefficientlyandeffectivelyextracted.Furtherworkinvolvescombiningtheuseofsocialmediadatatoimprovebusinessdecisionquality.

简介：ＷＵ－ＲＩＴＴ＇ＳＭＥＴＨＯＤＦＯＲＮＯＮＬＩＮＥＡＲＣＯＮＴＲＯＬＳＹＳＴＥＭＳ￥ＬＩＳｈｕｒｏｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅｉｊｉｎｇ１０００８０，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：Ｔｈｉ...

简介：TheanalysisandevaluationofanactualportsystemcontainingRdifferentship’skindsandNsubsystemseachofwhichconsistsofM.(i=1,2,…,N)portsarederived.TheexternalarrivalsofshipstothesystemcomefromRdifferentPoissonsourcesandtheinterarrivalstothequeueofeachportofasubsystemaredeterminedaccordingtoconditionprobabilities.EachporthasmultipleberthswhoseservicetimesaredistributedaccordingtoErlangprobabilitydistributionfunctions.EachportofasubsystemhasRinfinitecapacitybuffersforstoringshipsinterarrived.Thismethodprovidesagoodapproximationprocedureforobtainingsystemperfor-mancemeasuressuchaswaitingtimesofships,averagequeuelengths,etc.Optimumportcapacitycanthusbeevaluatedbyusingthisanalysis.Asimulationisalsopresentedtotestthisapproximateanalysis,andagoodagreementisobserved.Thismodelshallbeusedintheplanningofseveralactualportsystems.Throughtheapplicationofthismodel,itispossibletoanalyzeandevaluateperformancesofthesystems.

简介：

简介：

简介：这份报纸学习毁灭的概率的完全的monotonicity在古典风险模型和古典风险为那建模被散开使不安。作为一个副产品，作者由于Loeffen(2008)在最佳的红利问题上把一个其他的证明给结果。

简介：ThispaperaddressesthesupplychainengineeringanditsapplicationinChina’sretailingindustry.Basedontheapproachesofsystemsengineering,weproposetheconceptofsupplychainengineering,whichappliestheideaofsupplychainmanagementtotheengineeringpracticesthroughtheadvancedinformationandmanagementtechnology,tointegratethesupplychainsystemandoptimizeitsoperations.WethenillustratetheapplicationofthesupplychainengineeringinChina’sretailingindustry.Insuchpractices,wedevelopedthevirtualretailingenterprisemodeandtheFROM-SCMsystem,anddesignedthesalesassistantetc.SuchtheoryandpracticesaresuccessfullyappliedinMeiyijia,whichhastransformedMeiyijiafromatraditionalretailertoamodernserviceenterprise,andtheprofitsareresultedfromtheservicefeesratherthanthetraditionalsurplusbetweenbuyingandsellingprices.NowMeiyijiahasbuiltanecosystemwiththeretailerinthecore,theheadquarterastheserviceplatform.ThesuccessofMeiyijiainrecentyearsshowstheeffectivenessofthesupplychainengineering.