简介:BystudyingthespectralpropertiesoftheunderlyingoperatorcorrespondingtotheM/G/1queueingmodelwithoptionalsecondserviceweobtainthatthetime-dependentsolutionofthemodelstronglyconvergestoitssteady-statesolution.Wealsoshowthatthetime-dependentqueueingsizeatthedeparturepointconvergestothecorrespondingsteadystatequeueingsizeatthedeparturepoint.
简介:摘要:近年来,企业即时消息( EIM)的发展已成为热点。现有的企业即时通信产品存在各种问题,主要有: 1、采用的通信协议各不相同,导致各大厂商之间产品难以互联互通。 2、各大厂商的功能业务各不相同,系统和设备自成体系,增加了集成难度。 3、出于自身利益的考虑,各大厂商不对外开放自己的接口,阻碍了统一通信的发展。针对以上问题,本文引入 REST(Representational State Transfer,表述性状态转移 )技术,提出了一种针对 EIM需求量身定制的基于 Restful Services的 API,开发人员可以重用和调用 EIM系统中应用的 API,以进行进一步的开发。
简介:磅(基于地点的服务)是从GIS的发展的显著结果到geospatial信息服务。从下一代因特网和网提供的群众和机会由geospatial信息的要求面对了2.0,geospatial信息服务的一个新模型基于DMI(数字可测量的图象)被介绍。首先,磅的概念和网2.0的机会被介绍,然后,DMI的特征被讨论。拿图象城市
简介:Themaincharacteristicsofhighchromerefractoriesforcoalwaterslurrygasifierswereintroduced.ThedamagemechanismoftherefractorieswasanalyzedbyobservingthemicrostructureoftheusedhighchromerefractorieswiththeaidofSEM.Themaininfluencingfactorsontheservicelifeoftherefractoriesweresummarized.
简介:Nonverbalandnoncontactbehaviorsplayasignificantroleinallowingservicerobotstostructuretheirinteractionswithhumans.Inthispaper,anovelhuman-mimicmechanismofrobot’snavigationalskillswasproposedfordevelopingsociallyacceptableroboticetiquette.Basedonthesociologicalandphysiologicalconcernsofinterpersonalinteractionsinmovement,severalcriteriainnavigationwererepresentedbyconstraintsandincorporatedintoaunifiedprobabilisticcostgridforsafemotionplanningandcontrol,followedbyanemphasisonthepredictionofthehuman’smovementforadjustingtherobot’spre-collisionnavigationalstrategy.Thehumanmotionpredictionutilizesaclustering-basedalgorithmformodelinghumans’indoormotionpatternsaswellasthecombinationofthelong-termandshort-termtendencypredictionthattakesintoaccounttheuncertaintiesofbothvelocityandheadingdirection.Bothsimulationandreal-worldexperimentsverifiedtheeffectivenessandreliabilityofthemethodtoensurehuman’ssafetyandcomfortinnavigation.Astatisticalusertrialsstudywasalsogiventovalidatetheusers’favorableviewsofthehuman-friendlynavigationalbehavior.
简介:QingdaoJiaozhouBaysubseatunnelisthesecondself-builttunnelinChinawiththedesignedservicelifeover100years.Thedurabilityofliningconcreteareoneofanimportantfactorstodeterminatetheservicelifeoftunnel.Consideringthemainenvironmentalloadsandmechanicalloadsofsubseatunnel,thedurabilitypropertiesofliningconcreteundercombinedactionofcompressiveloadandcarbonationhasbeenstudiedthroughthecriticalcompressiveloadtest,acceleratedcarbonationtest,naturalcarbonationtestandcapillarysuctiontest.Thetestsresultsshowthatcriticalcompressiveloadapparentlyacceleratesthecarbonationanddeterioratestheanti-permeabilityofconcrete.Underthecombinedactionofcriticalcompressiveloadandcarbonation,thedurabilityofliningconcretedecreases.Basedonthecarbonizationlifecriteriaandresearchresults,forthehigh-performanceconcretewithproposedmixratio,thepredictedservicelifeofliningconcreteforJiaozhoubaysubseatunnelisabout80yearswhichfailstoreachtherequiredservicelife.Itisnecessarytoadoptothermeasurementssimultaneouslytoimprovethedurabilityofliningconcrete.