简介:C-2000前置放大器采用了Accuphase特有的AAVA(AccuphaseAnalogVari—gainAmplifier,金嗓子模拟可变增益放大器)音量控制设计,其音量控制的步级数可达216级,即65536级之多,可以实现非常精确的调节。此外,AAVA还能有效提高整机的信噪比并保持不变的频响特性。
简介:Alow-lossfiberopticrotaryjoint(FORJ)hasbeendesignedbyusingtwokindsofC-lenscollimators.Itsinsertionlossandinsertionlossvariationduetorotationwithsingle-modefibercollimatorislessthan1.76dBand0.43dBrespectively.Themaximuminsertionlossandcouplingvariationduetorotationwithmulti-modefibercollimatoris1.71dBand0.29dB,respectively.ThiskindofFORJfeatureslowinsertionloss,smallcouplingvariationduetorotationandlowcost.
简介:Thetracking,telemetryandcommand(TT&C)missionisextremelyreliableforitscharactersofsmalltimehorizonandhighredundancy.Thecombinedforcingandfailurebiasing(CFFB)methodthatisusuallyusedforsimulatingtheunreliabilityofthehighlydependablemissionsystemseemsnotsoefficientfortheTT&Cmission.TheconceptabouttheimportanceoffailuretransitionisproposedbasedonthelogicalrelationshipbetweenTT&Cmissionanditsinvolvedresources.Then,theimportanceisusedforreadjustingthetransitionrateofthefailuretransitionwhenusingtheforcingandfailurebiasingduringthesimulation.ExamplesshowthattheimprovedCFFBmethodcanevidentlyincreasetheoccurrenceoftheTT&Cmissionfailureeventanddecreasethesamplevariance.MoreredundancyoftheTT&CmissionleadstotheimprovedCFFBmethodmoreefficient.
简介:Modelingandreasoningondomaincontextsplayakeyroleforaddingintelligencetocommunicationservices,andtheapproachofcapability-basedrequirementengineeringensuresthescientificityandaccuracyofrequirementelicitation.Thispaperpresentsacapability-basedcontextontologymodelingapproachforcommandandcontrol,communication,computer,intelligence,surveillanceandreconnaissance(C4ISR)communication.Primarily,acapability-basedC~4ISRcommunicationmeta-conceptmodelandaC~4ISRcommunicationcontextmeta-ontologyareconstructed.ThecontextontologyisestablishedundertheconstraintsoftheC~4ISRcommunicationcontextmeta-ontology,andfurthermore,algorithmsareproposedtosupportcontextreasoningbasedondescriptionlogic.Acasestudyispresentedtodemonstrateapplicabilityoftheproposedmethod.
简介:风河系统公司日前推出最新发布的商用级Linux平台产品,该平台作为面向消费电子设备和网络设备制造市场的业界领先产品,整体基于最稳定的纯Linux2.6.14内核,并且增加了许多全新的特性。风河公司还同时推出了Linux版本的WindRiverGeneralPurposePlatform、PlatformforConsumerDevices和PlatformforNetworkEquipment等产品,同时套装了风河最新的基于Eclipse技术的设备软件开发组件——WindRiverWorkbench2.5,极大地提高了系统的运行时性能,缩小了基底尺寸,增强了安全性,