简介:介绍了利用公用移动网络来实现前兆观测数据的远程接收方案,并介绍了接收软件的开发及系统的配置。
简介:摘要:本文阐述了宽厚板精整生产线上的ABB AC450控制系统与SIEMENS S7-400控制器之间的以太网通讯实现。为了便于我们对系统更好地进行二次开发以及数据采集和分析,文中分别着重介绍了AC450 控制器和S7-400控制器侧的以太网通讯硬件组态配置和软件编制。
简介:ThelimitsofparameterγinFASTTCParestudiedinthispaper.AcontinuoustimefluidflowmodelofthelinkbufferisconsideredtocreatealinearcontrolsystemrelatedtoFASTTCP.Linearingthefluidflowmodelandwindowcontrolmodel,theLaplacetransformversionofcongestioncontrolsystemarepresented.Itresultsinanegativefeedbacksystemwithopenlooptransferfunction.WiththeanalysisofNyquistcurveofthesystem,asufficientconditiononasymptoticalstabilityofFASTTCPcongestionwindowrelatedtotheparameterγisobtained.Packetlevelns-2simulationsareusedtoverifythetheoreticalclaims.
简介:DuetotheproblemsarisingwhentheTransmissionControlProtocol(TCP)isappliedoverwirelessnetworks,manyTCPperformanceenhancementmechanismshavebeenproposed.However,suchmechanismsaren'tcompatiblewithIPSecprotocol.ThepaperreviewstheTCPperformanceenhancementmechanismsinwirelessnetworks.Thentheconflictsbetweenthemareanalyzed.Severalproposalsforsolvingtheconflictsarediscussed,andtheirbenefitandlimitationsareexamined.