简介：Anewadaptiveestimatorfordirectsequencespreadspectrum(DSSS)signalsusingfourth-ordercumulantbasedadaptivemethodisconsidered.Thegeneralhigher-orderstatisticsmaynotbeeasilyappliedinsignalprocessingwithtoocomplexcomputation.Basedonthefourth-ordercumulantwith1-Dslicesandadaptivefilters,anefficientalgorithmisproposedtosolvetheproblemandisextendedfornonstationarystochasticprocesses.Inordertoachievetheaccurateparameterestimationofdirectsequencespreadspectrum(DSSS)signals,thefirststepusesthemodifiedfourth-ordercumulanttoreducethecomputingcomplexity.Whilethesecondstepemploysanadaptiverecursivesystemtoestimatethepowerspectruminthefrequencydomain.Inthecaseofinterceptedsignalswithoutlargeenoughdatasamples,theestimatorprovidesgoodperformanceinparameterestimationandwhiteGaussiannoisesuppression.Computersimulationsareincludedtocorroboratethetheoreticaldevelopmentwithdifferentsignal-to-noiseratioconditionsandrecursivecoefficients.

简介：Anon-intrusivedesignformonitoringeverydayactivitiesofanelderlypersonispresented.Theproposedsystemisintendedtobeusedinthebedroom,allowingtheelderstostayathomeinasafeenvironment.Therequiredhardwaredesignissimpleinstructureandcosteffective.ThesensordesignisimplementedbyusingcapacitivesensorsandanArduinomicrocontrollerunit.Andarealtimegraphicaluserinterfaceisimplementedtomonitortheelderlyperson.Theperformanceanalysisshowsthatthesensordesignisabletodifferentiatebetweenahumanbodyandahousepet.

简介：Thefeaturesofnon-voicesignalsonpubliccommunicationnetsareanalyzedandanapproachtodistinguishsuchsignalsisintroducedinthispaper.Itisthefirsttimeforthesystemtomeetthreekeytargets:large-scale,highrecognitionrateandlowfalsealarmatthesametime.

简介：Thecharacteristicsoflow-frequencyelectricalnoise,voltage-current(V-I)andelectricalderivationfor980nmInGaAsP/InGaAs/GaAshighpowerdoublequantumwelllasers(DQWLs)aremeasuredunderdifferentconditions.Thecorrelationofthelow-frequencyelectricalnoisewithsurfacenon-radiativecurrentofdevicesisdiscussed.Theresultsindicatethelow-frequencyelectricalnoiseof980nmDQWLswithhighpowerismainly1/fnoiseandhasgoodrelationwiththedevicesurfacecurrentatlowinjection.

简介：Byaccuratelymeasuringthedisplacementbetweentherollersurfaceandtheopticalfiberproberelativetoanullposition,wecantesttherollerwear.Thewholetestingmethodandsystemwereintroduced.Eachpartofthetestingsystemwasillustrated.Andalsoanovelfiber-opticsensorwiththreeprobesinequaltransversespaceisadopted.Usingthissensor,theeffectsoffluctuationsinthelightsource,reflectivitychangingoftargetsurfaceandtheintensitylossesinthefiberlinesareautomaticallycompensated.Thismethodofferssuchadvantagesasnon-contact,noelectromagneticinterference,simplicity,lowcost,highsensitivity,goodaccuracyandstability.

简介：EnergyisthedeterminantfactorforthesurvivalofMobileSensorNetworks(MSN).Basedontheanalysisoftheenergydistributioninthispaper,atwo-phaserelocationalgorithmisproposedbasedonthebalancebetweentheenergyprovisionandenergyconsumptiondistribution.Ourmainobjectivesaretomaximizethecoveragepercentageandtominimizethetotaldistanceofnodemovements.Thisalgorithmisdesignedtomeettherequirementofnon-uniformdistributionnetworkapplications,toextendthelifetimeofMSNandtosimplifythedesignoftheroutingprotocol.Inad-dition,testresultsshowthefeasibilityofourproposedrelocationalgorithm.

简介：Lowpowerconsumptionisamajorissueinnowadayselectronicssystems.ThistrendispushedbythedevelopmentofdatacenterrelatedtocloudservicesandsoontotheInternetofThings(IoT)deployment.Memoriesareoneofthemajorcontributorstopowerconsumption.However,thedevelopmentofemergingmemorytechnologiespavesthewaytolow-powerdesign,throughthepartialreplacementofthedynamicrandomaccessmemory(DRAM)withthenon-volatilestand-alonememoryinserversorwiththeembeddedordistributedemergingnon-volatilememoryinIoTobjects.Inthelattercase,non-volatileflip-flops(NVFFs)seemapromisingcandidatetoreplacetheretentionlatch.Indeed,IoTobjectspresentlongsleeptimeandNVFFsoffertosavedatainregisterswithzeropowerwhentheapplicationisidle.ThispapergivesanoverviewofNVFFarchitectureflavorsforvariousemergingmemorytechnologies.

简介：Amodifiednon-coherentsequentialdetectiondecisionlogicbasedoncontinuousaccumulationtoachievefastPNcodeacquisitionisproposed.Tosimplifythedesignandanalysis,theequivalentrelationshipbetweenthelikelihoodratioofthecurrentsampleandthatofalltheprevioussamplesisdeduced.Theschemeisprovedtobeanoptimumsequentialdetectionundercertainassumptions.Becausetheaveragesamplenumber(ASN)cannotbecalculatedthroughthemethodsappliedtotheconventionalsequentialdetection,analgorithmisalsoprovided,whichcanestimateboththeprobabilitydensityfunction(pdf)andtheupperthresholeofASN.Thedesiredprobabilitiesoffalsealarmanddetection,aswellasfasterPNcodeacquisitioncomparedtotheconventionalsequentialdetectioncanbeachievedbyemployingthisstructure.Inaddition,Rayeigh-fadedreceptioncaseisalsotakenintoconsideration.Performancesoftheproposedschemesareobtained,whichsuggestthattheproposednon-coherentsequentialdetectionismoredesirable.

简介：Traditionaldigitalprocessingapproachesarebasedonsemiconductortransistors,whichsufferfromhighpowerconsumption,aggravatingwithtechnologynodescaling.Tosolvedefinitivelythisproblem,anumberofemergingnon-volatilenanodevicesareunderintenseinvestigations.Meanwhile,novelcomputingcircuitsareinventedtodigthefullpotentialofthenanodevices.Thecombinationofnon-volatilenanodeviceswithsuitablecomputingparadigmshavemanymeritscomparedwiththecomplementarymetal-oxide-semiconductortransistor(CMOS)technologybasedstructures,suchaszerostandbypower,ultra-highdensity,non-volatility,andacceptableaccessspeed.Inthispaper,weoverviewandcomparethecomputingparadigmsbasedontheemergingnanodevicestowardsultra-lowdissipation.

简介：Multilayerdielectricthinfilmedgefilterhasseriouspolarizationsensitivityunderobliqueincidence.Thecutoff-bandsofthes-polarizationandp-polarizationlightinconventionaledgefilterwillseparateobviouslyunder45°obliqueincidence,whichlimitsitsapplication.BasedonthetwochosenmaterialsTiO2andSiO2,anovelstackstructureisproposedtodesignthenon-polarizationshort-wave-passthinfilmedgefilter.Byusingthe(4H4L4H)asthematchinglayers,thepolarizationseparationat3dBtransmittanceforthethinfilmedgefiltercutoff-bandislessthan1nmattheincidentangleof45°.Inthisway,thenon-polarizationshort-wave-passedgefilteriseasilydesignedandfabricated.

简介：我们建议旋转传感器在一个磁性的头的一个核心基于一个纤维布拉格栅栏(FBG)包装了的新奇非接触，它从圆形的磁性的扶手统治者把介绍紧张变换成旋转信息。一个数学模型为处理一个讯问者获得的数据被造，并且大小的精确性和决定被改变传感器的圆形的磁性的扶手统治者，以及尺寸的半径和时期分析。它在有旋转角度上的理论分析的好一致的试验性的结果表演，和恰当的结果显示从旋转传感器获得的结果与0.998的线性和大约0.01的一个标准错误与真实旋转速度匹配很好。

简介：Thispaperpresentsthelowerboundsandupperboundsforthemeanvalueandvarianceofdistancedistributionofnon-linearcodesinGF(q).Bypresentingseveralexamples,itisshownthattheseboundscouldbeachieved.

简介：Thispaperproposesanoveliterativealgorithmforoptimaldesignofnon-frequency-selectiveFiniteImpulseResponse(FIR)digitalfiltersbasedonthewindowingmethod.DifferentfromthetraditionaloptimizationconceptofadjustingthewindoworthefilterorderinthewindowingdesignofanFIRdigitalfilter,thekeyideaofthealgorithmisminimizingtheapproximationerrorbysucces-sivelymodifyingthedesignresultthroughaniterativeprocedureundertheconditionofafixedwindowlength.Intheiterativeprocedure,theknowndeviationofthedesignedfrequencyresponseineachiterationfromtheidealfrequencyresponseisusedasareferenceforthenextiteration.Becausetheapproximationerrorcanbespecifiedvariably,thealgorithmisapplicableforthedesignofFIRdigitalfilterswithdifferenttechnicalrequirementsinthefrequencydomain.Adesignexampleisemployedtoillustratetheefficiencyofthealgorithm.

简介：我们理论上并且试验性地显示出在信号之间的比率的影响并且更闲散在连续波浪(CW)在获得特征上从PIA部分产生了抽非退化的串联阶段敏感的纤维光参量的放大器(PS-FOPA)。结果证明使用产生更闲散的罐头的高度非线性的纤维(HNLF)的长度引起力量比率在之间的变化更闲散并且在小信号获得条件下面表明PS-FOPA的特征，它显著地影响获得。为了高获得，增加，选择长HNLF产生更好更闲散。在我们的实验，5.5dB获得和18nm带宽(开／关获得>10dBm)当300m长的HNLF在PIA被使用而不是200m长的HNLF时，在PS-FOPA，罐头被完成。

简介：Anideaofestimatingthedirectsequencespreadspectrum(DSSS)signalpseudo-noise(PN)sequenceispresented.WithouttheapriorityknowledgeabouttheDSSSsignalinthenon-cooperationcondition,weproposeaself-organizingfeaturemap(SOFM)neuralnetworkalgorithmtodetectandidentifythePNsequence.Anon-supervisedlearningalgorithmisproposedaccordingtheKohonenruleinSOFM.TheblindalgorithmcanalsoestimatethePNsequenceinalowsignal-to-noise(SNR)andcomputersimulationdemonstratesthatthealgorithmiseffective.Comparedwiththetraditionalcorrelationalgorithmbasedonslip-correlation,theproposedalgorithm’sbiterrorrate(BER)andcomplexityarelower.

简介：Duringpursuiteyemovements,whethertherelationshipsamongthevisualsensitivity,pursuitvelocity,andtargetvelocityarelinearornon-linearisanoldissue.Inthisstudy,wereexaminedtheirrelationshipswithsevenspeedsbyasimplecharacterdiscriminationtaskusinganinfraredeyetracker.Ourresultsfoundthatthepursuitvelocityandaccuracywerenon-linearlyrelatedwiththetargetvelocity.Besides,theperceptualsensitivitywasnotlinearlyrelatedwiththepursuitvelocityeither.Asignificantdifferenceexistedbetweenlower(lessthan20deg/s)andhigherspeeds(greaterthan20deg/s).Inaddition,wefoundtherewasnopositionbiasofvisualsensitivitybetweenaheadofandbehindthepursuittarget,buttherewasasignificantperceptualdissymmetrybetweenhorizontalandverticaldirectionsatlowerpursuitspeeds.

简介：Amultilevelgratingcouplerbasedonsilicon-on-insulator(SOI)materialstructureisproposedtorealizethecouplingbetweenwaveguideandwaveguideorwaveguideandfiber.Thiscoupleriscompatiblewiththecurrentfabricationfacilitiesforcomplementarymetaloxidesemiconductor(CMOS)technologywithverticalcoupling.Thisstructurecanrealizecouplingwhenthebeamswithtransverseelectric(TE)polarizationandtransversemagnetic(TM)polarizationareincidentatthesametime.Theinfluencesofthegratingcouplerparametersincludingwavelength,thethicknessofwaveguidelayer,thethicknessofSiO2layerandthenumberofstepsontheTEmodeandTMmodecouplingefficienciesarediscussed.Theoryresearchesandsimulationresultsindicatethatthewavelengthrangeisfrom1533nmto1580nmwhentheTEmodeandTMmodecouplingefficienciesarebothmorethan40%asthegratingperiodis0.99μm.ThecouplingefficienciesoftheincidentTEandTMmodesare49.9%and49.5%atthewavelengthof1565nm,respectively,andthedifferencebetweenthemisonly0.4%.

简介：Byusingsilicon-on-insulator(SOI)platform,12channelwaveguides,andfourparallel-couplingone-microringresonatorroutingelements,anon-blockingfour-portopticalrouterisproposed.Structuredesignandoptimizationareperformedontheroutingelementsat1550nm.Atdropstatewithapowerconsumptionof0mW,theinsertionlossofthedropportislessthan1.12dB,andthecrosstalkbetweenthetwooutputportsislessthan-28dB;atthroughstatewithapowerconsumptionof22mW,theinsertionlossofthethroughportislessthan0.45dB,andthecrosstalkbetweenthetwooutputportsisbelow-21dB.Routingtopologyandfunctionaredemonstratedforthefour-portopticalrouter.Theroutercanworkatninenon-blockingroutingstatesusingthethermo-optic(TO)effectofsiliconfortuningtheresonanceofeachswitchingelement.Detailedcharacterizationsarepresented,includingoutputspectrum,insertionloss,andcrosstalk.Accordingtotheanalysisonallthedatalinksoftherouter,theinsertionlossiswithintherangeof0.13—3.36dB,andthecrosstalkislessthan-19.46dB.Theroutercanmeettheneedoflarge-scaleopticalnetwork-on-chip(ONoC).

简介：Thispapergivesthestrictsolutionofopticalfieldequationintheopticalwaveguideswithparabolic.Itshowsthatthephotonsinthenon-uniformopti-calwaveguidepropagatealongz-axisinspiralform,justlikeachargedparticlesmovinginthemagneticfield.Onlyinthestep-indexwaveguides,itcanthephotonspropagateinzizagform.

简介：Inthelaserwarningsystem,anon-mechanicalscanningFabry-Perot(F-P)typelaserwarningmethodanditscrucialcomponent-laserincidentsensordesignmethodarebroughtout,andtheF-Petalonwiththeinterferometricfiltercombinationisadopted.Fortheincidentlaserpulsewithacertainwavelength,thetransmittancedifferenceoftheinterferometricfiltersisindependentwithpolarizationofincidentlight,anddescendsalmostlinearlyastheincidentanglegetswider.Alaserincidentanglesensorexperimentalplatformisbuiltup,andtheexperimentiscarriedoutwithagivenlaserrangefinder.Astheresultsindicate,whentheincidentangleislessthan5o,thetransmittancedifferencemeasuredbythelaseranglesensorissignificantlylower,andthedeviationismorethan10%.Whiletheincidentangleisgreaterthan10o,thedeviationisreducedsignificantly.