简介：AkindoffiberBragggratingpressuresensorbasedoncorrugateddiaphragmisproposed.TherelationshipbetweenthecentralwavelengthofreflectivewaveofFBGandpressureisgiven,andtheexpressionofthepressuresensitivitycoefficientisalsogiven.Withintherangefromresultsagreewiththetheoreticalanalysis.Itisindicatedthattheexpectedpressuresensitivityofthesensorcanbeobtainedbyoptimizingthesizeandmechanicalparametersofthecorrugateddiaphragm.

简介：Onthebasisofopticallypoweredsensorprinciples,thispaperintroducesapracticalschemeofanopticallypoweredforcesensorusingapiezoelectriccrystalwork-inginclose-loopresonantmode.A3mWLDstabilixedisusedasopticalsource.Theop-ticalpoweringdistancereaches500mwhilethetotalpowerconsumptionofthemirco-powermeasuringheadisonly0.275mW.Thekeytechnicalproblemsofthesensorsarepresentedaswellasexperimentralresults.

简介：Anew128×128elementPtSiSchottkybarrierinfraredimagesen-sorwithITCCDreadortstructureandPtSithinfilmopticalcavitydetectorstruc-turehasbeenfabricated,whichhas50цm×50цmpixels,afillfactorof40per-cent,thenonuniformityof5%orlessandthedynamicrangeofoverorequalto50dB.Thenoiseequivalenttemperaturedifferenceis0.2Kwithf/1.0opticsat300Kbackground.Inthispaper,theprincipleofoperation,designconsiderationandfabric-cationtechnologyforthedevicearedescribed.

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简介：Basedonanalysisofnearinfraredspectralabsorptionofmethane,absorptiontypeopticalfibermethanegassensorwithhighsensitivityusingDFBLDasasourceisdemonstrated.Lightsourcemodulationharmonicmeasurementispresentedinthispaper.Inordertoeliminatethenoise,theratioofthefundamentalandsecond-harmonicsignalsisused.Themathematicalmodelofgasconcentrationharmonicmeasurementisbuiltup.Thedetectionresultofmethaneconcentrationisalsoshown.Experimentshaveprovedasensitivityof28×10-6.

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简介：由于连接增加，小世界现象在基于树的无线传感器网络存在。基于树的网络的小世界上的流行病被学习，并且流行病的爆发在发生的流行阀值是计算的。当感染概率比过滤阀值大时，流行病学的过程被分析。尽管不同流行病学的过程发生在内在的树拓扑学上，当感染传播，感染的节点的数字指数地增加。一致免疫过程在同类的小世界的网络被进行。尽管免疫有效地减少流行速度，感染仍然指数地延长。

简介：ThisstudyconcernssecurityissuesoftheemergingWirelessBodySensorNetwork(WBSN)formedbybiomedicalsensorswornonorimplantedinthehumanbodyformobilehealthcareappli-cations.Anovelauthenticatedsymmetric-keyestablishmentschemeisproposedforWBSN,whichfullyexploitsthephysiologicalfeaturesobtainedbynetworkentitiesviathebodychannelavailableinWBSNbutnototherwirelessnetworks.Theself-definedIntrinsicSharedSecret(ISS)isusedtoreplacethepre-deploymentofsecretsamongnetworkentities,whichthuseliminatescentralizedservicesorau-thoritiesessentialinexistingprotocols,andresolvesthekeytransportprobleminthepuresymmet-ric-keycryptosystemforWBSNaswell.Thesecuritypropertiesoftheproposedschemearedemon-stratedintermsofitsattackcomplexityandthetypesofattacksitcanresist.Besides,theschemecanbeimplementedunderalight-weightwayinWBSNsystems.DuetotheimportanceoftheISSconcept,theanalysisonusingfalseacceptance/falserejectionmethodtoevaluatetheperformanceofISSforitsusageintheschemeisalsodemonstrated.

简介：Anultrasensitivemetamaterialsensorbasedondouble-slotverticalsplitringresonators(DVSRRs)isdesignedandnumericallycalculatedintheterahertzfrequency.ThisDVSRRdesignproducesafundamentLCresonancewithaqualityfactorofabout20whentheincidencemagneticfieldcomponentnormaltotheDVSRRarray.TheresonantcharacteristicsandsensingperformanceoftheDVSRRarraydesignaresystematicallyanalyzedemployingacontrastmethodamongthreesimilarverticalsplitringresonator(SRRs)structures.Theresearchresultsshowthattheeliminationofbianisotropy,inducedbythestructuralsymmetryoftheDVSRRdesign,helpstoachieveLCresonanceofahighqualityfactor.LiftingtheSRRsupfromthesubstratesharplyreducesthedielectriclossintroducedbythesubstrate.AllthesefactorsjointlyresultinsuperiorsensitivityoftheDVSRRtotheattributesofanalytes.Themaximumrefractiveindexsensitivityis788GHz/RIUor1.04×10~5nm∕RIU.Also,theDVSRRsensormaintainsitssuperiorsensingperformanceforfabricationtolerancerangingfrom-4%to4%andwiderangeincidenceanglesupto50°underbothTEandTMilluminations.

简介：一种荧光眼纤维的温度计基于红宝石和吸收玻璃样品被设计。眼--纤维温度测量探查基于红宝石被开发。这个系统对在0℃to的范围的温度测量特别地能适应130℃。更加改进的表演在这台新设备被看见。到带的罐头的驱动电流容易通过控制电路在要求的定义界限以内被保留。

简介：Thedistributedopticalfibersensingtechnologyisoverviewed,whichisbasedonRamanscatteringlighttheory.Basicoperationprinciple,structure,systemcharacteristicsandsignalprocessingarediscussed.Thisstructureandmethodofthesignalprocessingpossessofcertainspatialresolution,hencewillensurethepracticabilityofsystem.

简介：在无线传感器网络减少精力消费的一个方法是在网络减少活跃节点的数字。当传感器冗余地被部署时，传感器的一个子集应该被选择活跃地监视这块地(叫作一个“封面”)，而传感器的其余部分应该被放睡觉保存他们的电池。在这份报纸，学习自动机基于算法因为在无线传感器网络(EEMLA)的精力有效的监视被建议。在EEMLA算法的每个节点与决定让节点在网络的操作期间在任何时间活跃的学习自动机被装备。用从附近的节点收到的反馈，每个节点逐渐地在网络的操作期间学习它的合适的状态。试验性的结果证明了与象Tian和LUC罐头那样的另外的存在方法相比的建议监视算法更好延长网络一生。

简介：Thepaperproposesacooperativedistributedtargettrackingalgorithminmobilewirelesssensornetworks.Therearetwomaincomponentsinthealgorithm:distributedsensor-targetassignmentandsensormotioncontrol.Inthekeyideaofthesensor-targetassignment,sensorsareconsideredasautonomousagentsandthedefinedobjectivefunctionofeachsensorconcentratesontwofundamentalfactors:thetrackingaccuracyandthetrackingcost.Comparedwiththecentralizedalgorithmandthenoncooperativedistrib...

简介：就严重资源限制和无线传感器网络(WSN)的安全威胁而言，文章建议了一个新奇层次路由协议算法。建议路由协议算法能根据节点的距离为节点采用合适的路由技术到基础车站，节点分发的密度，和节点的剩余精力。面对节点妥协以精力用法，包潜伏，和安全通过全面分析和模拟把建议路由协议算法与简单方向散开路由技术，基于簇的路由机制，和简单层次路由协议算法作比较攻击，结果证明建议路由协议算法为无线传感器网络是更有效的。

简介：Thispaperstudiestherelationshipbetweenmobility,navigationandlocalizationinthecontextofwirelesssensornetworkswithmobilebeacons.Itisobservedthatmobilitycanaidinnetworknodelocalizationandthatoncelocalized,thenetworknodescanlocalizeandtrackamobileobjectandguideitsnavigation.Adistributedkernel-basedalgorithmisproposedthatenablesthenodestoestablishconfidentpositionestimatesinthepresenceofranginginaccuracies.Theproposedapproachfeaturesrobustnesswithrespecttorangemeasurementinaccuracies,lowcomplexityanddistributedimplementation,usingonlylocalinformation.Simulationvalidatesourapproachviable.

简介：MostofthecurrentdeploymentschemesforWirelessSensorNetworks(WSNs)donottakethenetworkcoverageandconnectivityfeaturesintoaccount,aswellastheenergyconsumption.Thispaperintroducestopologycontrolintotheoptimizationdeploymentscheme,establishesthemathe-maticalmodelwiththeminimumsumofthesensingradiusofeachsensors,andusesthegenetical-gorithmtosolvethemodeltogettheoptimalcoveragesolution.Intheoptimalcoveragedeployment,thecommunicationandchannelallocationarefurtherstudied.Thentheenergyconsumptionmodelofthecoverageschemeisbuilttoanalyzetheperformanceofthescheme.Finally,theschemeissimulatedthroughthenetworksimulatorNS-2.Theresultsshowtheschemecannotonlysave36%energyav-eragely,butalsoachieve99.8%coveragerateundertheconditionof45sensorsbeingdeployedafter80iterations.Besides,theschemecanreducethefivetimesinterferenceamongchannels.

简介：DecisionfusionrulesforWirelessSensorNetworks(WSNs)underNakagamifadingchannelsareinvestigatedinthispaper.ConsideringtheapplicationlimitationofLikelihoodRatioTestfusionrulebasedoninformationofChannelStatisticsusingSeriesexpansion(LRT-CSS),andthedetectionperformancelimitationoftheCensoringbasedMixedFusionrule(CMF),anewLRTfusionrulebasedoninformationofchannelstatisticshasbeenpresentedusingLaplaceapproximation(LRT-CSL).TheoreticalanalysisandsimulationsshowthattheproposedfusionruleprovidesbetterdetectionperformancethantheCensoringbasedMixedFusion(CMF)andLRT-CSSfusionrules.Furthermore,comparedwithLRT-CSSfusionrule,theproposedfusionruleexpandstheapplicationrangeoflikelihoodratiotestfusionrule.

简介：Thispaperdescribesanovelwavelet-basedapproachtothedetectionofabruptfaultofRotorcraftUnmannedAerialVe-hicle(RUAV)sensorsystem.Byuseofwavelettransformsthataccuratelylocalizethecharacteristicsofasignalbothinthetimeandfrequencydomains,theoccurringinstantsofabnormalstatusofasensorintheoutputsignalcanbeidentifiedbythemulti-scalerepresentationofthesignal.Oncetheinstantsaredetected,thedistributiondifferencesofthesignalenergyonalldecomposedwaveletscalesofthesignalbeforeandaftertheinstantsareusedtoclaimandclassifythesensorfaults.

简介：聚类提供一个有效方法延长无线传感器网络的一生。当簇出发划分网络，一个聚类的协议的主要问题之一正在选择传感器节点的一个最佳的组。另外一个是内部簇的通讯的模式。在这份报纸，一平衡精力的不相等的聚类(EBUC)协议被建议并且评估。由使用粒子群优化(PSO)算法，EBUC把所有节点划分成不相等的尺寸，更近到基础车站的簇在有更小的尺寸的簇。这些簇的簇头能保存一些更多的精力因为内部簇的继电器交通和热点问题能被避免。为内部簇的通讯，EBUC采用精力知道的multihop路由减少簇头的精力消费。模拟结果证明协议罐头高效地减少死者节点加速并且延长网络一生。

简介：Anewmethodtoreducethereflection-inducedphasebetweenthetwoortho-gonalcomponentsofthelinearlypolarizedlightafterthereflectionsispresented.Thiskindofsensorhaadessiertofabricateandadjustthanthatwhoseinternalreflectionisatcriticalangle.