简介:TheanalysisandevaluationofanactualportsystemcontainingRdifferentship’skindsandNsubsystemseachofwhichconsistsofM.(i=1,2,…,N)portsarederived.TheexternalarrivalsofshipstothesystemcomefromRdifferentPoissonsourcesandtheinterarrivalstothequeueofeachportofasubsystemaredeterminedaccordingtoconditionprobabilities.EachporthasmultipleberthswhoseservicetimesaredistributedaccordingtoErlangprobabilitydistributionfunctions.EachportofasubsystemhasRinfinitecapacitybuffersforstoringshipsinterarrived.Thismethodprovidesagoodapproximationprocedureforobtainingsystemperfor-mancemeasuressuchaswaitingtimesofships,averagequeuelengths,etc.Optimumportcapacitycanthusbeevaluatedbyusingthisanalysis.Asimulationisalsopresentedtotestthisapproximateanalysis,andagoodagreementisobserved.Thismodelshallbeusedintheplanningofseveralactualportsystems.Throughtheapplicationofthismodel,itispossibletoanalyzeandevaluateperformancesofthesystems.
简介:ThispaperaddressesthesupplychainengineeringanditsapplicationinChina’sretailingindustry.Basedontheapproachesofsystemsengineering,weproposetheconceptofsupplychainengineering,whichappliestheideaofsupplychainmanagementtotheengineeringpracticesthroughtheadvancedinformationandmanagementtechnology,tointegratethesupplychainsystemandoptimizeitsoperations.WethenillustratetheapplicationofthesupplychainengineeringinChina’sretailingindustry.Insuchpractices,wedevelopedthevirtualretailingenterprisemodeandtheFROM-SCMsystem,anddesignedthesalesassistantetc.SuchtheoryandpracticesaresuccessfullyappliedinMeiyijia,whichhastransformedMeiyijiafromatraditionalretailertoamodernserviceenterprise,andtheprofitsareresultedfromtheservicefeesratherthanthetraditionalsurplusbetweenbuyingandsellingprices.NowMeiyijiahasbuiltanecosystemwiththeretailerinthecore,theheadquarterastheserviceplatform.ThesuccessofMeiyijiainrecentyearsshowstheeffectivenessofthesupplychainengineering.
简介:摘要本文摘选了ZYJ7型电液转辙机较为典型的转辙机电路故障个例进行了详细分析。根据故障现象,现场处理人员通过正确的处理思路,判断出故障点,最终恢复故障,从而及时地将设备恢复正常,确保当天列车正常稳定运行。
简介:网络经济是为今天在巨大的连接描绘的经济元素之中的全球关系的一个术语。在资源和活动被分享的地方,新时代的中央行为是在互相相互依赖的关系的许多层次在深网网络把一切连接到一切,市场被扩大,费用和风险被减少。网络系统包含积极、否定的反馈。许多反馈进程创造复杂系统行为。为如此的一个网络,分析网络过程(ANP)途径似乎很适当。ANP方法使系统地与各种依赖和反馈经营系统可能。动态模型试着反映变化在真实或simulatedtimeand考虑网络模型部件常常正在演变。动态模型使用州的变量,流动,和反馈进程的概念。动态网络进程(DNP)是能在联网的经济处理时间依赖者优先级的ANP的扩展。
简介:Abankhadbetterrationitscreditifitfirstentersagraysystemofcreditinformationwhereitcannotdistinguishbetweenthelow-andhigh-riskborrowers.Asthebankkeepsalong-termrelationshipwithitsborrowersthebanklearnsabouttheborrowersthroughtime.WiththehelpoflogitmodelandBayesrule,abankcanprocesscustomer'screditinformationandbuildabettercredittermitgives.
简介:可编程控制器(简称PLC)是专为在工业环境中应用而设计的一种工业控制用计算机,具有抗干扰能力强,可靠性高,体积小等优点,是实现机电一体化的理想装置。本文分析了数控中的PLC,进而论述了PLC实现数控系统的定位控制。