简介:Currently,1bitor2bitsignalquantizationiswidelyusedinsatellitenavigationsoftwarereceivers.Thebit-wiseparallelalgorithmhasbeenproposedfor1bitand2bitsignalquantization,whichperformscorrelationwithhighefficiency.Inordertoimprovetheperformanceofthecorrelator,thispaperproposesanew1.5bitquantizationmethod.Theoreticalanalysesaremadefromtheaspectsofcomplexityandquantizationloss,andperformancecomparisonbetween1.5bitquantizationcorrelatorandtraditionalcorrelatorsisdiscussed.Theresultsshowthatthe1.5bitquantizationalgorithmcansaveabout30percentcomplexityundersimilarquantizationloss,reducemorethan0.5dBsignalnoiseratio(SNR)lossundersimilarcomplexity.Itshowsgreatperformanceimprovementforcorrelatorsofsatellitenavigationsoftwarereceivers.
简介:Forenhancingthe2.0μmbandfluorescenceofHo3+,acertainamountofWO3oxidewasintroducedintoHo3+/Tm3+/Yb3+tri-dopedtelluriteglasspreparedusingmelt-quenchingtechnique.Thepreparedtri-dopedtelluriteglasswascharacterizedbytheabsorptionspectra,fluorescenceemissionandRamanscatteringspectra,togetherwiththestimulatedabsorption,emissioncross-sectionsandgaincoefficient.TheresearchresultsshowthattheintroductionofWO3oxidecanfurtherimprovethe2.0μmbandfluorescenceemissionthroughtheenhancedphonon-assistedenergytransfersbetweenHo3+/Tm3+/Yb3+ionsundertheexcitationof980nmlaserdiode(LD).Meanwhile,themaximumgaincoefficientofHo3+at2.0μmbandreachesabout2.36cm-1.Anintense2.0μmfluorescenceemissioncanberealized.
简介:SaaS环境下的租户共用软硬件基础设施,负载均衡是实现可扩展、高性能SaaS系统的关键技术之一。本文关注SaaS环境下的工作流管理系统,研究其SaaS使能技术。首先,提出一种SaaS使能的工作流管理系统集成架构WfMS4SaaS;然后,重点研究工作流引擎的负载均衡方法,提出一种主动式的工作流引擎负载预测算法,根据引擎的当前负载和预测的执行开销调度流程执行请求。实验表明,本文的方法考虑了流程多样性带来的负载影响,可以更加公平地利用工作流引擎资源,更适合面向多租户使用的SaaS环境。