简介:VSS典故“卷影副本服务”(Volumenshadowcopyservice,以下简称VSS)是Windows2003系统免费提供的智能文件存储组件,它可以有效地避免数据丢失。VSS能在预定的时间间隔内对文件夹中的数据进行备份,为这些数据创建“影子副本”(“影子副本”就好像是原文件的“影子”一样,不断记录原文件的变化)。用户的数据一旦被破坏,就可以通过这些影子副本进行还原。
简介:ThispaperproposesanovelsessionsetupmechanisminIMS(IPMultimediaSubsystem)byintroducingthefunctionalentitytermedVSS(VisitorSubscriberServer)whichisusedtoprovideregistrationandlocationmanagement.ThenewmechanismaimsatimprovingsessionsetupprocedurebyabettermentoflocationmanagementinIMS.Throughtheuseoftwo-tiersubscriberinformationdatabaseconstitutedbytheHSS(HomeSubscriberServer)andtheVSS,thenewmechanismseperatestheregistrationprocedureandlocationmanagementfromtheS-CSCF(Serving-Call'SessionControlFunction),andmakesthembehandledbytheVSS.Atthesametime,thenewmechanismupdatesthesignalingprocedureofregistrationandsessionsetup.WithVSSbasedlocationmanagement,thecostofregisterationandsessionsetupprocedureaswellasthedelayofsessionsetupprocedurebecomelower.Thecostanddelayfunctionsofthenewsessionsetupmechanismaswellasthecostfunctionofnewregisterationarededuced.Then,simulationsandanalysisverifythattheperformanceofthisnewmechanismgetsthebenefitincostandtime.
简介:本文介绍了VSS及VPN技术的基本工作原理,讨论了利用VPN技术结合VSS实现了远程协作开发的原理,并给出了一种基于Windows环境下的实现方案。