简介:Featureselection(FS)isaprocesstoselectfeatureswhicharemoreinformative.Itisoneoftheimportantstepsinknowledgediscovery.Theproblemisthatnotallfeaturesareimportant.Someofthefeaturesmayberedundant,andothersmaybeirrelevantandnoisy.TheconventionalsupervisedFSmethodsevaluatevariousfeaturesubsetsusinganevaluationfunctionormetrictoselectonlythosefeatureswhicharerelatedtothedecisionclassesofthedataunderconsideration.However,formanydataminingapplications,decisionclasslabelsareoftenunknownorincomplete,thusindicatingthesignificanceofunsupervisedfeatureselection.However,inunsupervisedlearning,decisionclasslabelsarenotprovided.Inthispaper,weproposeanewunsupervisedquickreduct(QR)algorithmusingroughsettheory.ThequalityofthereduceddataismeasuredbytheclassificationperformanceanditisevaluatedusingWEKAclassifiertool.Themethodiscomparedwithexistingsupervisedmethodsandtheresultdemonstratestheefficiencyoftheproposedalgorithm.
简介:目前,闪电是10自然灾难之一,并且它也是力量打断的最高的环境因素。它经常引起巨大的损失到电的系统。自从1980年代末,中国和科技的Huazhong大学的州的格子公司的武汉高电压研究所一直在研究并且发展中闪电地点系统(LLS)。在mid-1990s,一个闪电察觉网络在中国在29个省和城市被创造。很快发现闪电事故首先被使用,还原剂它极大地驱动打断。另外,它保证高效率和电系统的安全操作。显著利益被完成。中国的LLS通过了一“放的取向-放的时差-综合的放”开发过程。放的精确,察觉效率,自动化的学位,有实行可能和应用范围被改进。另外,国家网络的一个闪电信息系统计划被实现了,它满足整个协会。
简介:Inholographicencryption,doublerandom-phaseencodingintheFresneldomain(DRPEiFD)isaprevalentencryptionmethodbecauseitislenslessandsecure.However,noisesbringadverseeffectsduringdecryption.Inthisletter,weintroducequick-response(QR)codingduringencryptiontoresistnoises.WetransformtheoriginalinformationintoaQRcodeandthenencryptthecodeasahologramthroughDRPEiFD.Toretrievetheinput,wedecryptthehologramintheoppositemannertotheencryptionandsubsequentlyobtainaQRcodewithnoises.Byscanningthiscodewithproperapplicationsinsmartphones,wecanobtainanoise-freeretrieval.Numericalexperimentsandimagesscannedbyasmartphoneareshowntovalidateourproposedmethod.
简介:Objective:Toinvestigatetheefficacyofquickrepositioningmaneuverforhorizontalsemicircularcanalbenignparoxysmalpositionalvertigo(H-BPPV).Methods:Clinicaldataof67patientswithH-BPPVwhounderwentquickrepositioningmaneuverinourhospitalfromJuly2009toNovember2014wereretrospectivelyanalyzed.Themaneuverinvolvedrotatingthepatientintheaxialplanefor180fromtheinvolvedsidetowardscontralateralsideasquicklyaspossible.Results:Completesymptomresolutionwasachievedin61patients(91.0%)atoneweekandin64patients(95.5%)at3monthspost-treatment.Duringtherepositioningmaneuverprocess,therewerenoobviousuntowardresponsesexcepttransientnauseawithorwithoutvomitinginafewpatients.Conclusion:TheresultsindicatethatthequickrepositioningmaneuverisaneasyandeffectivealternativetreatmentinthemanagementofHBPPV.
简介:AMW6.4earthquakeoccurredinL'Aquila,centralItalyat1:32:42(UTC),April6,2009.WequicklyobtainedthemomenttensorsolutionoftheearthquakebyinvertingthePwaveformsofbroadbandrecordingsfromtheglobalseismographicnetwork(GSN)stationsusingthequicktechniqueofmomenttensorinversion,andfurtherinferredthatthenodalplaneofstrike132°,dip53°andrake-103°istheseismogenicfault.
简介:Doubledataratesynchronousdynamicrandomaccessmemory(DDR3)hasbecomeoneofthemostmainstreamapplicationsincurrentserverandcomputersystems.Inordertoquicklysetupasystem-levelsignalintegrity(SI)simulationflowfortheDDR3interface,twosystem-levelSIsimulationmethodologies,whichareboard-levelS-parameterextractioninthefrequency-domainandsystem-levelsimulationassumptionsinthetimedomain,areintroducedinthispaper.BycomparingtheflowofSpeed2000andPowerSI/Hspice,PowerSIischosenfortheprintedcircuitboard(PCB)board-levelS-parameterextraction,whileTektronixoscilloscope(TDS7404)isusedfortheDDR3waveformmeasurement.Thelabmeasurementshowsgoodagreementbetweensimulationandmeasurement.ThestudyshowsthatthecombinationofPowerSIandHspiceisrecommendedforquicksystem-levelDDR3SIsimulation.
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简介:本文介绍了解决QuickBasic程序调用汇编程序时数据区匹配问题的一种简便方法。