简介：ThepaperpresentsanalgorithmofautomatictargetdetectioninSyntheticApertureRadar(SAR)imagesbasedonMaximumAPosteriori(MAP).Thealgorithmisdividedintothreesteps.First,itemploysGaussianmixturedistributiontoapproximateandestimatemulti-modalhistogramofSARimage.Then,basedontheprincipleofMAP,whenaprioriprobabilityisbothunknownandlearnedrespectively,thesamplepixelsareclassifiedintodifferentclassesc={target,shadow,background}.Last,itcomparestheresultsoftwodifferenttargetdetections.Simulationresultspreferablyindicatethatthepresentedalgorithmisfastandrobust,withthelearnedaprioriprobability,anapproachtotargetdetectionisreliableandpromising.

简介：SurfacePenetratingRadar(SPR)isarecentlydevelopedtechnologyfornon-destructivetesting.Itcanbeusedtoimageandinterprettheinnerstructureofthereinforcedconcrete.ThispapergivesthedetailsaboutacompactandhandheldSPRdevelopedrecentlyforreinforcedconcretestructuredetection.Thecenteroperationfrequencyoftheradaris1.6GHz.Notonlyithasfastacquisitionability,butalsoitcandisplaythetestingresultontheLCDscreeninreal-time.Thetestingresultsshowthattheradarhasapenetratingrangeofmorethan30cm,andalateralresolutionbetterthan5cm.Theperformancevalidatesthattheradarcanmeettheapplicationrequirementsforreinforcedconcretestructuredetection.

简介：AbstractInfectious disease outbreaks have seriously endangered global health owing to the scarcity of testing materials and techniques. Diversified materials and methods should be urgently developed for rapid detection and discrimination of pathogenic microorganisms. Conjugated polymer (CP) materials are macromolecular compounds comprising numerous covalently bonded luminescent units. They have excellent light-harvesting and optical signal amplification capabilities owing to the transmission of excitation energy along their backbone. In recent years, CP materials have aroused research enthusiasm in the biosensors field because of their outstanding optoelectronic properties. This brief manuscript provides an overall review of recent progress achieved in CP-based systems for pathogen sensing.

简介：ToexploretherelationbetweenserumbilinabinandeoronaryheartdiseaseMethodsComparethelevelofserumbilinabinamongpatientswitheoronaryheartdisease,patientswithotherdiseaseandnormalpersons.ResultsThelevelofserumbilinabinofpatientswithcoronaryheartdiseaseishigherthanthatofnormalpersons.ConclusionThereductionofdensityofserumbihrubinisoneoftheindependentriskfactorsofcoronaryheartdisease.

简介：Inunderwateropticalwirelesscommunication(UOWC),achannelischaracterizedbyabundantscattering/absorptioneffectsandopticalturbulence.MostpreviousstudiesonUOWChavebeenlimitedtoscattering/absorptioneffects.However,experimentsintheliteratureindicatethatunderwateropticalturbulence(UOT)cancauseseveredegradationofUOWCperformance.Inthispaper,wecharacterizeanUOWCchannelwithbothscattering/absorptionandUOTtakenintoconsideration,andaspatialdiversityreceiverscheme,sayasingleinput–multiple-output(SIMO)scheme,basedonalight-emitting-diode(LED)sourceandmultipledetectorsisproposedtomitigatedeepfading.TheMonteCarlobasedstatisticalsimulationmethodisintroducedtoevaluatethebit-error-rateperformanceofthesystem.Itisshownthatspatialdiversitycaneffectivelyreducechannelfadingandremarkablyextendcommunicationrange.

简介：Anewtechniqueispresentedtodetecttargetsunderseabackground.Focusedoninterestedareas,thespatialandfrequencydistributionsarefirststudied,thenanalyticexpressionoftargetsissetupbyleastsquaremethod(LSM).Accordingtotheshape,frequency,andanalyticexpressionoftargets,amatchedbiorthogonalwaveletisconstructedtobetterenhancetargetsandeliminatenoises.Resultsshowtheusefulnessofthismethodforsingleframedetection(signaltonoiseratioSNR≥1.25),whichprovidesabetterperformancethanclassicwaveletsandmorphologicalfiltering.

简介：Radio-frequencyinterference(RFI)affectsgreatlythequalityofthedataandretrievalproductsfromspace-bornemicrowaveradiometry.AnalysisoftheAdvancedMicrowaveScanningRadiometerontheEarthObservingSystem(AMSR-E)AquasatelliteobservationsrevealsverystrongandwidespreadRFIcontam-inationsontheC-andX-banddata.Fortunately,thestrongandmoderateRFIsignalscanbeeasilyidentifiedusinganindexonobservedbrightnesstemperaturespectrum.ItistheweakRFIthatisdiffi-culttobeseparatedfromthenaturesurfaceemission.Inthisstudy,anewalgorithmisproposedforRFIdetectionandcorrection.Thesimulatedbrightnesstemperatureisusedasabackgroundsignal(B)andadepartureoftheobservationfromthebackground(O-B)isutilizedfordetectionofRFI.ItisfoundthattheO-Bdeparturecanresultfromeitheranaturalevent(e.g.,precipitationorflooding)oranRFIsignal.AseparationbetweenthenatureeventandRFIisfurtherrealizedbasedonthescatteringindex(SI).ApositiveSIindexandlowbrightnesstemperaturesathighfrequenciesindicateprecipitation.IntheRFIcorrection,arelationshipbetweenAMSR-Emeasurementsat10.65GHzandthoseat18.7or6.925GHzisfirstdevelopedusingtheAMSR-EtrainingdatasetsunderRFI-freeconditions.ContaminationofAMSR-Emeasurementsat10.65GHzisthenpredictedfromtheRFI-freemeasurementsat18.7or6.925GHzusingthisrelationship.ItisshownthatAMSR-EmeasurementswiththeRFI-correctionalgorithmhavebetteragreementwithsimulationsinavarietyofsurfaceconditions.

简介：ＭＣＣＤＭＡ如同ＤＳＣＤＭＡ一样，也存在多用户干扰．ＭＬ准则是最佳的多用户检测准则，但其计算复杂度随用户数目增多而呈指数增长．神经网络利用其大规模并行的特点，可应用于此问题．本文论述了均场退火和混沌神经网络在此问题中的解决方案，并作了比较．

简介：AIM:Toinvestigateenoughvalidmeasurements(VMs)toassessliverfibrosisinchronichepatitisBpatients(CHB).METHODS:OnehundredandtwelveCHBpatients(25women,87men)withameanageof38.43yearsreceivedliverstiffnessevaluationsusingreal-timeshearwaveelastographyfor10VMs.Allpatientsunderwentliverbiopsy.Basedonthebiopsypathology,theliverstiffnessdataobtainedfromdifferentVMs(1,2,3,5and10times)werecomparedfortheevaluationofliverfibrosis.ThecorrelationbetweentheelasticmodulusmeansoftheliverobtainedfromdifferentVMsofdetectionateachpathologicalstagewasanalysed.Thereceiveroperatingcharacteristic(ROC)curvewasemployedtodeterminethediagnosticperformanceofdifferentVMsofdetection,andtheareasundertheROCcurveofdifferentgroupswerecompared.RESULTS:Theliverstiffnessvaluesobtainedfrom1VM,2VMs,3VMs,5VMsandall10VMsforstageF0were6.95±2.01kPa,6.87±1.83kPa,6.90±1.88kPa,6.95±1.93kPaand7.15±1.89kPa,respectively(F=0.043,P=0.996).ForstageF1,thesevalueswere7.12±1.72kPa,7.24±1.72kPa,7.21±1.74kPa,7.10±1.78kPaand7.04±1.70kPa,respectively(F=0.075,P=0.990).ForstageF2,theywere9.37±3.87kPa,9.18±3.68kPa,9.19±3.81kPa,9.18±3.81kPaand9.19±3.53kPa,respectively(F=0.012,P=1.000).ForstageF3,thesewere11.91±3.88kPa,11.78±4.04kPa,11.83±4.07kPa,11.94±4.17kPaand12.00±4.02kPa,respectively(F=0.010,P=1.000).ForstageF4,thereadingswere19.30±7.63kPa,19.40±7.36kPa,19.54±7.43kPa,19.73±7.21kPaand20.25±7.22kPa,respectively(F=0.054,P=0.995).Therewerenosignificantdifferencesbetweenthesegroups.Intraclasscorrelationcoefficientsamongdifferentpathologicalstages(F0-F4)withdifferentdetectionVMswere0.995,0.993,0.996,0.994and0.996,respectively.Themeanelasticityvaluesfrom1VM,2VMs,3VMs,5VMsand10VMscanaccuratelydistinguishfibrosisstages(F0vsF1234,F01vsF234,F012vsF34andF0123vsF4)withnosignificantdifferencesinthefivegroups(P>0.05forall).CONCLUSION:One

简介：一个模型(贝叶斯的海洋的前面察觉，BOFD)海表面温度(SST)在卫星的前面察觉--导出的SST图象基于阀值间隔被介绍，在象气候、环境的研究或渔业那样的不同应用程序被过去常。模型首先由使用一个Sobel算法模板计算SST坡度。根据坡度价值，阀值间隔被一个坡度决定累积直方图。根据这阀值间隔，前面候选人能被获得，优先的概率和可能性的能是计算的。候选人是否是前面点，能被使用贝叶斯的决定理论决定。模型在自台湾东面的菲律宾海流向日本的暖流前面区域的部分的先进很高分辨率的辐射计图象上被评估。结果与使用方法在文学建议了的几SST前面察觉获得的那些相比。这比较证明BOFD不仅压制噪音和小规模的前面，而且保留连续前面。

简介：Thispaperstudiesadetectionmethodoftargetsofhighresolutionradaroperatingatthebandofmillimeter-wave(32-38GHz)underthebackgroundoftheclutters,andproposesanewnonparametricdetectionmethod,whichnotonlydoeslesscomputation,butalsoisabletodetectmultipleextendedtargetsradiallydistributedalongdistance"corridor",basedontheposition(range)correlationinformationofone-dimensionalrangeimages(orcalledrangeprofiles)ofhighresolutionradartargets.Theexperimentalresults,ontherealechodataoftankilluminatedbythemillimeter-wavesteppedfrequencyhighresolutionradar,havecertifiedthatsuchamethodpresentedinthispaperisaveryeffectivedetectionmethodformultipleextendedtargets.

简介：因为它的吸引人的表演，超导的nanowire单身者光子察觉者(SNSPD)在极端紫、可见、在红外线附近的波长引起许多注意，并且它能在量信息技术是普遍的。然而，怎么增加罐头戏剧性地增加SNSPD的量效率的吸收仍然是一个顶研究问题。在这研究，洞综合的SNSPD的光吸收比上的事件媒介和洞材料的效果系统地用有限元素的方法被调查。模拟结果为光子表明那极化的平行到nanowire取向尽管nanowire的最大的吸收比对洞材料感觉迟钝，事件媒介的折射索引什么时候减少，确实增加。为垂直地极化的光子，事件媒介和洞材料起重要作用，并且吸收比曲线作为洞材料增加的折射索引接近平行案例。把结果基于这些，有能为平行、垂直的光子提高吸收比的前面照明结构的二洞综合的SNSPD被建议。最后，与高吸收比认识到极化无关的SNSPD的一个图案被介绍。

简介：Themethodofusingmultiplexingtechniquetorealizetheopticallypoweredmultipledetectionsystemispresented.Asthissystemadoptednoveltimeandpulsewidthmultiplexingtechniques,reliableseparationanderrorcodecorrectingtechniques,itrealizesopticallypoweredmultiplechannelandparametersdetection,andsuccessfullyappliedintheoiltanksfortemperature,pressure,liquidlevelandreservemeasurings.

简介：Movingtargetdetection(MTD)techniqueisdesignedtofilteringouttheclutters.ThebasisoftheMTDdigitalsignalprocessorisabankofDopplerfiltersdesignedusingFFTalgorithm.Forhighpulserepetitionfrequency(HPRF),itleadstoalongtimecalculationsandgreatcomplexityinhardwareimplementation.FrequencydomaindetectorisrepresentedbyWelchmethodRealizedDopplerfiltersbankwhichwillreducethetimecalculation.Theproposedmethodenhancesthetargetdetectioncapabilitiesbyprovidinghigherdetectionprobabilitiesorlowerfalsealarmrates.Theperformanceofthetwosystems,thetraditionalMTD-IandWelchmethodarecomparedfromtheviewpointofprobabilityofdetection(Pd),probabilityoffalsealarm(Pfa).Computersimulationresultsarepresentedtosupportthesuperiorityoftheproposedtechnique.

简介：Anewcycle-by-cyclecontrolflybackconverterwithprimarysidedetectionandpeakcurrentmodecontrolisproposedanditsdynamiccharacteristicsareanalyzed.TheflybackconverterisverifiedbytheOrCADsimulator.Themainadvantagesofthisconverterovertheconventionalonearesimplicity,smallsize,rapidregulatingandnosensingcontrolsignalsovertheisolationbarrier.Thecircuitissuitablefordigitalcontrolimplementations.

简介：InaCDMAcommunicationnetworkusingconventionalsignaldetection,systemcapacityislimitedanditsperformanceisdegradedbythemulti-accessinterference(MAI).Multiuserdetection,whichmakesuseofcross-correlationinformationbetweenspreadspectrumcodes,canreduceoreliminatetheMAIinaGaussianchannelsoastomitigatethenear-fareffectsandincreasethesystemcapacity.ThispaperextendsthemultiuserdetectortoaflatRayleighfadingCDMAenvironment,anddiscussesthebiterrorrateoftypicalmultiuserdetectionalgorithmsinsuchaenvironmentbycombiningtheoreticalanalysisandcomputersimulation.ItisshownthatmultiuserdetectionissuperiortoconventionaldetectionsintheflatRayleighfadingchannels.

简介：为在扫描数据的激光的特征察觉的方法自从技术的出现被学习十年了。然而，它仍然是在在不均匀的取样的点由于质地和结构信息抽取的困难处理的激光雷达数据的未解决的问题之一。纸在激光雷达数据为结构察觉分析Gaussian(日志)过滤器和它的潜在的使用的拉普拉斯算符的特征。基于木头，过滤在未组织的点上被介绍并且试验的一个特征察觉方法。方法过滤举起值(也就是，z坐标价值)由用在它的本地区域以内的日志核的卷绕旋转的每个点并且导出建议地面反对/展示的某些类型的存在的模式。实验被继续从一个邻居区域获得的点云数据集。结果证明在在定义的标准差之间的不同规模和关系检测的模式记载核和邻居尺寸，它指定被分析的本地区域。

简介：基于极化察觉察觉到系统的新奇分布式的光纤维颤动被建议并且示威。一面法拉第转子镜子在系统的结束被采用，它消除到外部颤动干扰引起的快速的极化变化的信号光和仅仅回答的慢极化变化。基于察觉到的信号特征，极化骚乱点的地点能精确地被检测。极化控制器模拟和实际颤动察觉的实验证明比1%好的更高的本地化精确性成功地在察觉到纤维系统的13.8km，21.2km和35.8km被获得。

简介：EpidemiologicalstudiesshowedtheincidencemortalityratesofcancerwereincreasinginrecentdecadesinChinesepopulation.Nationalandregionalpreventiveprogramsaimtoreducethehealthhazardsofcancerandfocusethepopulationathighrisksforspecificcancer,particularlyinruralareasandtooffertheaccesstoearlydetectionformultlplecancersinurbanareas.Theearlyscreening,earlydetectionandtreatmenthavebeenputintooperationforthepopulationatrisksinruralareasatfirst,andintheurbanareasinrecentyears.Tounderstandtheepidemicpatternsandtrendsofcancer,andtheexperiencesinapplyingearlydetectionstrategiesinChina,selectedliteratureswerereviewedforbriefsummary.

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