简介:BasedontheintroductionoftheSino-RussiantimbertradeandthehistoryabouttimberexportinRussia,thepapergivesthereasonsfortheadjustmentinRussiantimberexportanditsinfluenceontimberimportinChina.FinallycountermeasuresagainstRussianadjustmentintimberexporttariffsareproposed.
简介:Inthiseraofadata-drivensociety,usefuldata(BigData)isoftenunintentionallyignoredduetolackofconvenienttoolsandexpensivesoftware.Forexample,weblogfilescanbeusedtoidentifyexplicitinformationofbrowsingpatternswhenusersaccesswebsites.Somehiddeninformation,however,cannotbedirectlyderivedfromthelogfiles.Wemayneedexternalresourcestodiscovermoreknowledgefrombrowsingpatterns.Thepurposeofthisstudyistoinvestigatetheapplicationofwebusageminingbasedonweblogfiles.Theoutcomeofthisstudysetsfurtherdirectionsofthisinvestigationonwhatandhowimplicitinformationembeddedinlogfilescanbeefficientlyandeffectivelyextracted.Furtherworkinvolvescombiningtheuseofsocialmediadatatoimprovebusinessdecisionquality.
简介:Asamanifestationoftheunderlyingphysicalnature,quailtumoscillationswiththeappliedmagneticfield(B)areoneofthemostimportanttopicsincondensedmatterphysics.Theresearchhistorycanbetrackedto1930whenLevShubnikovandW.J.deHaasobservedShubnikov-deHaas(SdH)oscillationsinthemagnetoresistance(MR)ofbismuthcrystals.Sincethen,researchershaveobservedquantumoscillationsindiversematerials,includingmetals,metalliccompounds,semimetals,semiconductorsandeveninsulators,aswellasinartificialmesoscopicmicrostructures.Nowadays,quantumoscillationdetectedbymagnetotransportinvestigationhasbeenapowerfultooltodetectthephysicalpropertiesinsolid-statesystems.
简介:Inthispaper,weproposeasparseovercompleteimageapproximationmethodbasedontheideasofovercompletelog-Gaborwavelet,meanshiftandenergyconcentration.Theproposedapproximationmethodselectsthenecessarywaveletcoefficientswithameanshiftbasedalgorithm,andconcentratesenergyontheselectedcoefficients.Itcansparselyapproximatetheoriginalimage,andconvergesfasterthantheexistinglocalcompetitionbasedmethod.Then,weproposeanewcompressionschemebasedontheaboveapproximationmethod.TheschemehascompressionperformancesimilartoJPEG2000.TheimagesdecodedwiththeproposedcompressionschemeappearmorepleasanttothehumaneyesthanthosewithJPEG2000.
简介:WemusttakeintoaccountChina’suniquenationalconditionswhendecidinghowtobuilda'think-tankcluster'.Chinaisahugecountry,itsbillion-pluspopulationisthreetimesaslargeasEurope’s,fourtimesthatoftheUSand10timesbiggerthanJapan’s.ThatmeansthatChineseelitesandintellectualsshouldalsooutnumbertheirEuropean,American,
简介:Theboat-coffinsandsingle-logcoffinsarelocatedinNo.58,Shangye商业Street,withinthefirstringroadofChengdu成都downtownarea.FromJuly2000tothebeginningof2001ChengduMunicipalInstituteofAntiquityandArchaeologymadeanexcavationofthissiteanddeterminedittobeamassivetomboftheearlyWarringStatesperiod.ItwasselectedasoneofthetoptengreatarchaeologicaldiscoveriesinChinain2000anddeclaredbytheStateCouncilasahistoricalsiteofthefifthgroupunderspecialprotectionwithinChinainJuly2001.
简介:Duetotheopennessofthecognitiveradionetwork,spectrumsensingdatafalsification(SSDF)canattackthespectrumsensingeasily,whilethereisnoeffectivealgorithmproposedincurrentresearchwork,sothispaperintroducesthemalicioususersremovingtotheweightsequentialprobabilityradiotest(WSPRT).Theterminals'weightisweightedbytheaccuracyoftheirspectrumsensinginformation,whichcanalsobeusedtodetectthemalicioususer.Ifoneterminalownsalowweight,itcanbetreatedasmalicioususer,andshouldberemovedfromtheaggregationcenter.SimulationresultsshowthattheimprovedWSPRTcanachievehigherperformancecomparedwiththeothertwoconventionalsequentialdetectionmethodsunderdifferentnumberofmalicioususers.
简介:Gaussianmodelswithoutintermittencyareextensivelyusedinestimatingtheeffectofturbulence,butitalsobringssomepuzzles,forexampletheobservedpulseshapethatdisagreeswiththeresultofthestandardtheoryofinterstellarscintillations.Indeedthepropertyofintermittencyisinherentinturbulence,i.e.,allthequantitiesthatcharacterizeitsufferfromstrongfluctuations.Soitisnecessarytoconsiderturbulentintermittencyinmanyapplications.Inthispaperweproposeanon-Gaussianphasescreen,whichobeyslog-Poissonstatistics,andalsooffersthecorrespondingpointspreadfunction(PSF).TheseresultsdescribethatintermittencyleadstothemoreextentanddifferentdirectionaldistributionofPSF.Theoreticalanalysisismadeunderthehypothesisofthephasedifferencesatisfyinglog-Poissonstatistics,andtheaveragepointspreadfunction,whichaccordqualitativelywiththeresultoftheabovegeneratedphasescreen,isderived.
简介:具有大小,位移,旋转不变性(TRSI)的目标识别是一个三阶问题,如果采用三阶神经网可以使问题得以解决,但最大难点就是互连权矩阵的组合爆炸问题,在本文中,我们将视觉生物物理学的研究成果应用到高阶神经网的研究中,首次提出双向Log-Polar变换与高阶网(HONN)结合的方法,有效地解决了权系数的组合爆炸问题,进一步提高了识别率。取得了突破性进展,使得将高阶网用于自动目标识别成为可能。