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简介：Weconsidertheclassicalpolicyiterationmethodofdynamicprogramming(DP),whereapproximationsandsimulationareusedtodealwiththecurseofdimensionality.Wesurveyanumberofissues:convergenceandrateofconvergenceofapproximatepolicyevaluationmethods,singularityandsusceptibilitytosimulationnoiseofpolicyevaluation,explorationissues,constrainedandenhancedpolicyiteration,policyoscillationandchattering,andoptimisticanddistributedpolicyiteration.Ourdiscussionofpolicyeva...

简介：“老板，你这儿有Intel牌的电脑吗？”电脑城内一句笑话见证了当年Intel在用户心中的强势。80PLUS认证或许永远不可能闹出这样的笑话，不过无可否认的是随着消费者节能意识的增长及对PC电源重要性深刻的认识，80PLUS认证在市场所受到的关注度越来越高。今天，就让我们—起来认识这些具有80PLUS印记的电源!

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简介：NewalgorithmsbasedonartificialneuralnetworkmodelsarepresentedforcubicNURBScurveandsurfaceinterpolation.Whenallthknotspansareidentical,theNURBScurveinterpolationproceduredegeneratesintothatofuniformrationalB-splinecurves.Ifalltheweightsofdatapointsareidentical,thentheNURBScurveinterpolationproceduredegeneratesintotheintegralB-splinecurveinterpolation.

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简介：Thispapershowsthemethodofestimatingspatiotemporaldistributionofpedestriansbyusingwatchcameras.Weestimatethedistributionwithouttrackingtechnology,withpedestrian’sprivacyprotectedandinUmedaundergroundmall.Latelyspatiotemporaldistributionofpedestrianshasbeingincreasinglyimportantinthefieldofurbanplanning,disasterpreventionplanning,marketingandsoon.Althoughmanyresearchershavetriedtocapturetheinformationoflocationasdealingwithsomesensors,someproblemsstillremain,suchastheinvestmentofsensors,therestrictionofthenumberofpeoplewhohasthedevicetheyareabletocapture.Fromsuchbackground,wedevelopanoriginallabellingalgorithmandestimatethespatiotemporaldistributionofpedestriansandtheinformationofthepassingtimeandthedirectionofpedestriansfromsequentialimagesofawatchcamera.

简介：数字存储卡已经进入了SD时代，那么CF卡将何去何从呢？LEXAR80XCF卡给出了很明确的答案，那就是走向专业。

简介：不可否认,80PLUS认证固然有其积极的一面,不但推动了厂家和用户对转换效率与节能意识的提升,而且树立了一定的标杆供大家衡量与超越。但客观来看,任何事物都有辨证的另一面,尤其是到了中国的DIY市场。由于概念的泛滥与透支,实际上80PLUS已经异化为部分厂商标榜、炫耀实力的道具。

简介：众所周知，web服务一般在默认情况下占用系统的80端口，并通过80端口为来自网络的其他主机提供服务。作为被黑客重点攻击的对象，在80端口上，我们费一番工夫也是值得的。

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简介：ThispaperproposesandevaluatestwoimprovedPetrinet(PN)-basedhybridsearchstrategiesandtheirapplicationstoflexiblemanufacturingsystem(FMS)scheduling.Thealgorithmsproposedinsomepreviouspapers,whichcombinePNsimulationcapabilitieswithA*heuristicsearchwithinthePNreachabilitygraph,maynotfindanoptimumsolutionevenwithanadmissibleheuristicfunction.Toremedythedefectsanimprovedheuristicsearchstrategyisproposed,whichadoptsadifferentmethodforselectingthepromisingmarkingsandreservestheadmissibilityofthealgorithm.Tospeedupthesearchprocess,anotheralgorithmisalsoproposedwhichinvokesfasterterminationconditionsandstillguaranteesthatthesolutionfoundisoptimum.TheschedulingresultsarecomparedthroughasimpleFMSbetweenouralgorithmsandthepreviousmethods.Theyarealsoappliedandevaluatedinasetofrandomly-generatedFMSswithsuchcharacteristicsasmultipleresourcesandalternativeroutes.

简介：Thispaperdealswiththevectorcontrol,includingboththedirectvectorcontrol(DVC)andtheindirectvectorcontrol(IdVC),ofinductionmotors.ItiswellknownthattheestimationofrotorfluxplaysafundamentalroleintheDVCandtheestimationofrotorresistanceisvitalintheslipcompensationoftheIdVC.Intheseestimations,theprecisionissignificantlyaffectedbythemotorresistances.Therefore,onlineestimationofmotorresistancesisindispensableinpractice.Forafastestimationofmotorresistances,itisnecessarytoslowdowntheconvergencerateofthecurrentestimate.Ontheotherhand,forafastestimationoftherotorflux,itisnecessarytospeedupitsconvergencerate.Itisverydifficulttorealizesuchatrade-offinconvergenceratesinafullorderobserver.Inthispaper,weproposetodecouplethecurrentobserverfromthefluxobserversoastorealizeindependentconvergencerates.Then,theresistanceestimationalgorithmisappliedtobothDVCandIdVC.Inparticular,intheapplicationtoIdVCthefluxobserverneedsnotbeused,whichleadstoasimplerstructure.Meanwhile,independentconvergenceratesofcurrentobserverandfluxobserveryieldanimprovedperformance.Asuperiorperformanceinthetorqueandfluxresponsesinbothcasesisverifiedbynumeroussimulations.

简介：这款手机采用3.2英寸HVGA高分辨率显示屏，虽然不是智能平台，但功能配置比较全面，尤其是多媒体方面支持不错，它带有300万像素摄像头，采用了3．5mm耳机接口，可以播放RMVB格式的影片。

简介：AMonteCarloAnalysisofnodesdeploymentforlarge-scaleandnon-homogeneouswirelesssensornetworks,hasbeendone.Throughsimulationsofrandomdeploymentsofnodesoverasquareareausingdifferentdensities,assumingthatournetworkiscomposedbyAnchornodes(specialsensorswithknownposition)andsimpleSensornodes,thelatteraresupposedtoestimatetheirownpositionafterbeingplacedwithinthecoverageareawiththeminimumAnchornodesneededto'feed'themwiththenecessaryinformation.Thegoalisthentoassistdecision-makersinselectingamongdifferentalternativestodeploythenetworks,accordingtoresourcesfeaturesandavailability,hencethismethodprovidesanestimatevalueofhowmanyAnchornodesshouldbedeployedinagivenareatotriggerthelocationalgorithminthegreatestpossiblenumberofSensornodesinthenetwork.

简介：更轻巧则更便携，更便携则更商务。2008年，美国专业投影机制造厂商富可视的专业设计团队“全美工作设计室”颠覆了公众对投影机的传统认识：富可视超便携投影机LP80c的诞生将投影机这种曾经的会议室大块头缩小到了A4纸的一半大小，再加上其10公斤的超轻重量，让商务人士穿梭于商务会场轻松自如。

简介：RTOS是开发计算机嵌入式应用产品的有力工具，研究和掌握RTOS的思想方法有益于提高开发人员的水平，从而缩短产品开发周期、提高产品质量。从第7期起，学习园地连载《嵌入式RTOS讲座》，主要内容如下：什么是嵌入式RTOS；RTOS中的一些基本概念；介绍一个源码公开的实时内核；在PC机上实现该实时内核的运行；让该实时内核在8位单片机上运行；如何将该实时内核移植到32位CPU上。

简介：近日，3M公司面向大型会议室推出了一款亮度达到4500流明的高端投影机——X80C。

简介：爱普生MEOFFICE80W在激光打印品质下，黑白打印速度可达到每分钟27页，是同等价位彩色激光打印机黑白打印的2.5倍。彩色打印速度也突破性地达到每分钟19页，是彩色激光打印机彩色打印速度的2.4倍。在同档次喷墨打印产品中处于领先地位。同时，在清晰的经济模式下，黑白彩色打印速度均可达到每分钟38页，降低了内部办公打印成本，