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简介：Formanyclusteringalgorithms,itisveryimportanttodetermineanappropriatenumberofclusters,whichiscalledclustervalidityproblem.Inthispaper,anewclusteringvalidityassessmentindexisproposedbasedonanovelmethodtoselectthemarginpointbetweentwoclustersforin-ter-clustersimilaritymoreaccurately,andprovidesanimprovedscatterfunctionforintra-clustersimilarity.Simulationresultsshowtheeffectivenessoftheproposedindexonthedatasetsunderconsiderationregardlessofthechoiceofaclusteringalgorithm.

简介：Byusingfourspeciallydesignednarrowbandpassfiltersandphotodetectorsintheinstrument,theincidentandreflectedradiancesofsunlightonthevegetationareopticallysensed,attheredandnearinfraredbands,thenthenormalizeddifferencevegetationindex(NDVI)isprocessedbyamicroprocessor.ComparedwithconventionalspectrometermeasuringmethodofNDVI,theinstrumentiseasytobeused,compact,lightandlow-cost.

简介：Aimingattheproblemthatthereisn'tanystandardizedcalibrationmethodfortheperformanceindexofsurfaceplasmonresonance(SPR)sensor,thecalibrationmethodforkeyperformanceindicesofSPRsensorissummarizedandproposedbasedonthecomparisonofrelativemethodsanddefinitionofeachindex.Experimentaldataofsucrosesolutionswithvariousconcentrationsareobtainedbytheself-buildingSPRinstrument,andthenthecalibrationmethodisusedtodeterminetheperformanceindices,suchasnoise,drift,sensitivity,resolution,linearity,dynamicrangeandreproducibility.Experimentalresultsshowthatthedefinitionofindicesisreasonable,andthecalibrationmethodiscorrect,whichhasgreatsignificanceforperformanceevaluationofSPRsensor.

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简介：Aswitchingvariabilityindex(SVI)constantfalsealarmrate(CFAR)detectorisproposedforimprovingthedetectionperformanceofVI-CFARdetectorsinmultipletargetsbackgrounds.Whenthepresenceofnon-homogeneityinCFARreferencewindowsisindicatedbyaVI-CFARdetector,aswitchingCFARdetectorisintroducedtooptimizetheperformanceoftheVI-CFARdetectorinhomogeneous,multipletargetsandclutteredgebackgrounds.ThestructureandparametersselectionmethodoftheSVI-CFARdetectorispresented.ComparisonswithclassicCFARdetectorsandrecentlyproposeddetectorsarealsogiven.TheoreticalanalysisandsimulationresultsshowthatSVICFARdetectormaintainsthegoodperformanceoftheVI-CFARdetectorinhomogeneousandclutteredgebackgrounds,whilegreatlyimprovingthecapacityofanti-multitargets.

简介：Losslessdatahidingcanrestoretheoriginalstatusofcovermediaafterembeddedsecretdataareextracted.In2010,Wangetal.proposedalosslessdatahidingschemewhichhidessecretdatainvectorquantization(VQ)indices,buttheencodingstrategiesadoptedbytheirschemeexpandthefinalcodestream.ThispaperdesignsfourembeddingandencodingstrategiestoimproveWangetal.'sscheme.TheexperimentresultoftheproposedschemecomparedwiththatoftheWangetal.'sschemereducesthebitratesofthefinalcodestreamby4.6%andraisesthepayloadby1.09%onaverage.

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简介：ByuseoftheKeldyshnn-equilibriumGreen's-functionmethods,thethirdharmonicsusceptibilitiesoftwopolyanilinefamilies,PANI-HCl巨PANI－H3PO4，arccalculated[x^(3)(ω）≈10^-12esu].Itwasfoundthatthethirdharmonicsusceptibilityofpolyanilinestronglydependsonthedelocalizationoftheelectrons.Therefractiveindicesn(λ=589nm)ofPANI-HClandPANI-H3PO4arecalculatedbyuseofthreecommonmethods(theLorentz-Lorentztheoreticalmodel,theGladstone-DalegroupcontributionandtheVogelgroupcorrelation)basedongroupcontributionstomolarrefraction.Thecalculatenvaluesarevariedfrom1.31to1.42forPANI-HCland1.36to1.45forPANI-H3PO4.

简介：大多数存在移交决定系统(HDS)图案是整体的，导致高计算的费用并且全面网络失衡。有为第5产生(5G)的一个全面负担索引的一个新奇模块化的移交算法异构的网络(HetNets)被建议。在这份报纸，移交参数，用作移交的基础，被分类进服务(QoS)的网络质量模块，用户偏爱(起来)满足(DS)的模块和度模块根据新模块化的HDS设计。优化切换的过程，全面网络负担索引被使用三角模块熔化操作员推出。关于存在移交算法，模拟结果显示建议算法能减少移交频率并且在高水平维持用户满足。由于它的块计算，同时，它能引起1.4s实行时间改进。

简介：Thecharacteristicmodificationsarereportedonthesurfaceofpolymericwaveguidefilmintheprocessofvolume-gratingfabrication.Thelightfromamode-locked76MHzfemtosecondlaserwithpulsedurationof200fsandwavelengthof800nmisfocusednormaltothesurfaceofthesample.Thesurfacemorphologymodificationsareascribedtoafactthatsurfaceswellingoccursduringtheprocess.Periodicmicro-structureisinscribedwithincreasingincidentpower.Thelaser-inducedswellingthresholdonthegrating,whichishigherthanthatoftwo-photoninitiatedphoto-polymerization(TPIP)(8mW),isverifiedtobeabout20mW.Itisfeasibletoenhancethesurfacesmoothnessofintegratedopticsdevicesforfurtherencapsulation.Thevariationofmodulationdepthisstudiedfordifferentvaluesofincidentpowerandscanspacing.Ablationaccompaniedwithsurfaceswellingappearswhenthepowerishigher.Byoptimizingthelasercarvingparameters,highlyefficientgratingdevicescanbefabricated.

简介：Inthispaper,thephotonicbandgapofphotoniccrystalswithchiralandnegative-indexmaterialsalternatelyisinvestigated.Itisshownthatthiskindofphotoniccrystalexhibitsverywidephotonicbandgap.Thephotoniccrystalswithadefectlayerhaveanarrowdefectmodeinthebandgap,whichcanbeusedasaverygoodfilteringmaterialbychoosingtheparametersofthedefectlayerproperly.

简介：Inthispaper,aplasmonicsrefractiveindexsensorwiththesemiring-stubsystemcoupledtoabuswaveguideispro-posed.Thestructurecanachievewavelengthbandtunableandultra-sharpFanoresonance.Thecouplingmechanismbetweenthebrightmodeanddarkmodeisinvestigatedindetail,andapparentplasmoninducedtransparency(PIT)isrealizedontheresonancewavelength.Thefullwidthathalfmaximum(FWHM)oftheresonantwavelengthismodulatedbyadjustingthecoupleddistance.Thesensitivityandfigureofmerit(FOM)oftheproposedsensor'canreachupto600nm/RIUand120onthevisibleregion,respectively,andthisperformancecanbehelpfulfordesigningthephotonicintegratedcircuitandopticalcommunication,inaddition,itcanbeappliedforbio-sensing.

简介：Lightpropagationinnanoparticle-loadedencapsulantsissimulatedbasedonthemethodofMonteCarlo,referringtothemultilayergraded-refractive-indexstructureforLEDencapsulants.Andtheinfluenceofscatteringcoefficientonthetransmittanceisanalyzed.Theresultsshowthatthetransmittancedecreaseswithscatteringcoefficient.Foragivennumberoflayers,theencapsulantswillyieldmaximumtransmittanceiftherefractiveindexvalueofeachlayerisoptimized.Thenanoparticle-loadedencapsulantconsistsofmultiplelayerswithrefractive-indexvaluesthatgraduallydecrease.Thetransmittancewillbehigherthanthatoftraditionalnon-gradedencapsulants,andwillimprovelightextractionefficiencyofLED.

简介：Torealizecontent-basedretrievaloflargeimagedatabases,itisrequiredtodevelopanefficientindexandretrievalscheme.ThispaperproposesanindexalgorithmofclusteringcalledCMA,whichsupportsfastretrievaloflargeimagedatabases.CMAtakesadvantagesofk-meansandself-adaptivealgorithms.Itissimpleandworkswithoutanyuserinteractions.Therearetwomainstagesinthisalgorithm.Inthefirststage,itclassifiesimagesinadatabaseintoseveralclusters,andautomaticallygetsthenecessaryparametersforthenextstage-k-meansiteration.TheCMAalgorithmistestedonalargedatabaseofmorethantenthousandimagesandcompareitwithk-meansalgorithm.Experimentalresultsshowthatthisalgorithmiseffectiveinbothprecisionandretrievaltime.

简介：我们报导在与公司2激光制作的熊猫纤维摇长时期栅栏(PR-LPGs)的期刊。PR-LPGs很高完成与12个时期和3.5湩愠汬慩据?楷桴联合19dB的效率？

简介：一个有效压缩方法被基于与在完全上的Gabor字典匹配追求(MP)算法编码原子的顺序索引建议，它有优点与低失真根据实际请求调整压缩比率(CR)。减少计算复杂性也与基因算法(GA)被相结合。然后，这个方法的有效性被在electrocardiography(ECG)的压缩使用它验证，Electroencephalography(EEG)发信号。模拟结果证明CR能分别地在ECG和EEG信号上与1.06%和2.15%仅仅重建错误在18:1被完成。它与传统的方法，和噪音抑制效果的相比有更高的CR和更少重建错误也被介绍。

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