简介:新的戴尔PowerVault136T磁带存储系统基于新兴的线性磁带开放(LTO)标准,定位于那些有着大量数据备份需求的商业客户。PowerVault136T起价为人民币130,156元,拥有内置的系统管理诊断功能,支持高达14.4TB的存储容量、72个LTO磁鼓以及6个LTO磁带驱动器。为提供更快的速度和更多的用途,
简介:Stationkeepingmode(SKM)forAttitudeOrbitControlSubsystem(AOCS);itisanoperationalapproachregardingtheattitudedynamicscontrol.Theessentialfeaturesofthedesignmethodologyisresearchingthebasictheoryandthenafterwards,makeaniterativedesignapproachusingsomepremise/assumptions,implementingthesystemsimulationthroughtheSimulinkMatlabsoftwarepackage,designingtherequiredcontrollers,monitorandanalyzingtheresponsesuntilthedesigngivethebestresultswithintherangerequired.Firstlythethrusterconfigurationisdesignedtoacquiretheparametersofthetorqueonthesatellite.Next,thecontrollersarebasedonthewellknownPIDcontrollaw.ControllersoptimizetheattitudeandareusedduringthemaneuversforSKM.Afterwardsthesimulationresultsaregiven,andpresentedtodemonstratetheperformanceandvalidityoftheAOCSdesignapproach.FinallythesimulationresultsdemonstratethatalltherequirementswereaccomplishedandtheStationKeepingModewassuccessfullydesigned.
简介:目前家居无线宽带保障安全的方法,不外乎加装防火墙,购买杀毒软件和在路由器上进行安全设置,这些方法已经被证明行之有效。而笔者最近发现了一款由趋势科技与合勤科技合作开发的新一代家居无线宽带路由器ZyXELP-334WT。它捆绑了趋势科技的防毒软件,这无疑又是一个软硬结合保障家居无线宽带安全的范例。该款产品造型为银色镜面,搭配黑色的外壳及天线,内建六国语言设定接口。它提供了无线“g+SuperSpeed”技术和宽带安全服务(TrendMicroHomeNetworkSecurityDervices,TMSS系统),可以帮助用户建立严密的家居网络防护体系。