简介:WorkhasbeendonewithextendingtheusefulimaginganddetectionrageofCCD.ThiswasaccomplishedthroughdirectopticalcouplingandbondingofimageintensifierstotheCCD.IthasbeenshownthattheusefulrangeofaCCDmaybeextendedtwoordersofmagnitudeusingthesetechniquesincouplingamicrochannelplateimageintensifiertotheCCDarray.AlloftheseworksweredonewithpresentlyavailableCCDmadebyChina
简介:Anewandefficienttechniquefordeterminingoptimallocationsofsensorsandactuatorsofintelligentstructuresispresented.Theoptimizationofsensorandactuatorlocationsisbasedonthe1stordersingularvalueperturbationsofobservabilityandcontrollability.Usingthismethodtheoptimalplacementsofsensorsandactuatorsoftheintelligentstructurercanbeselected.Twonumericalexamplesaregiventodemonstratetheapplicationsofthemethod.Theimpulseresponsesofstructuresduetodifferentlocationsofactuatorswiththesamecontrollawareanalyzedindetail.
简介:Thestructureofanintensitymodulationopticalfibersensorisintroduced.Theprincipleofthesensorwhichcandetectminordisplacementbyuseofminorcurveindarkgroundisdescribed.Complexexperimentshowsthatthemultimodeopticalfibernotonlyhastheabilitlyofdetectingthedisplacementoflessthan0.1nm,butalsoexhibitscharacteristicsofwidedynamicrangeandgoodlinearity.
简介:Acompressionalgorithmisproposedinthispaperforreducingthesizeofsensordata.Byusingadictionary-basedlosslesscompressionalgorithm,sensordatacanbecompressedefficientlyandinterpretedwithoutdecompressing.Thecorrelationbetweenredundancyofsensordataandcompressionratioisexplored.Further,aparallelcompressionalgorithmbasedonMapReduce[1]isproposed.Meanwhile,datapartitionerwhichplaysanimportantroleinperformanceofMapReduceapplicationisdiscussedalongwithperformanceevaluationcriteriaproposedinthispaper.Experimentsdemonstratethatrandomsamplerissuitableforhighlyredundantsensordataandtheproposedcompressionalgorithmscancompressthosehighlyredundantsensordataefficiently.
简介:Arobustdigitalreceiverbasedonamatchedfilter(MF)isproposedfortheradiofrequencyidentification(RFID)readersystemtoenhancethereliabilityofsignalprocessingintheelectronicproductcode(EPC)sensornetwork(ESN).Theperformanceoftheproposedreceiverisinvestigatedbyexaminingtheanti-collisionalgorithmintheEPCglobalClasslGeneration2protocol.Thevalidityandusefulnessaredemonstratedbybothcomputersimulationsandexperiments.Basedontheverificationresults,comparingwiththeconventionalzerocrossingdetector(ZCD)basedreceiver,theproposedreceiverisveryrobustagainststrongamplitudedistortionsandconsiderablefrequencydeviationshappeningonthebackscatteredsignalfromapassivetag.
简介:本地化是在无线传感器网络的实质的问题之一。为活动烽火本地化的关键问题是怎么选择适当烽火轨道。然而,很少研究都没在它上被做。在这篇论文,第一,我们推出位置的数字让烽火根据ROI(兴趣的区域)的面积送一个包;下我们在场一个新奇方法基于虚拟力量到在任意的ROI安排位置;然后,我们使用TSP(旅行售货员问题)算法到位置顺序到获得最佳的旅游路径,即减少的烽火轨道。活动烽火什么时候沿着旅游路径移动,送RF,在每个位置发信号,在ROI的传感器能与trilateration得出他们的位置。试验性的结果证明本地化方法,基于烽火减少的路径,是有效的;有灵活精确性。
简介:在无线传感器节点的动态电源管理(DPM)是为减少闲散精力消费的一种著名技术。DPM由动态地基于事件出现的预言翻转它的单位的开/关地位控制一个节点操作模式。然而,后来,每个模式变化在它的自己的权利导致一些开销,保证DPM效率不是在展出有未知统计的非宿命论和无常的环境的吝啬的功绩。我们在这份报纸的解决方案套房,一起指了同样认知的电源管理(CPM),是向在统计上未知的设置的创新DPM的一次原则性的尝试并且给二不同分析保证。我们的第一个图案在面临非静止的事件过程时基于学习自动机和保证better-than-pure-chanceDPM。我们的第二个解决方案迎合事件出现可以在雇用一个对手的人物的甚至更一般的设置。在这种情况中,我们以节点在依靠一个no-external-regret过程以一种联机方式学习它的得最高分的战略策略的一场重复零和的比赛与它的环境提出单个尘埃的相互作用。我们进行数字实验以网络一生和事件损失百分比测量我们的计划的表演。
简介:Developmentofsensorneedlesforchinesetraditionalmedicineisalongtermre-searchprojectinouruniversity.Now,temperature.PH,PO2andpotentialsensorneedleshavebeendeveloped.Thesenewelementsarederivedfromthecombinationbetweenasensorandanac-tuator.Thedesignprinciple,functionalmaterials,fabricationtechnic,calibrationmethodandclin-icalapplicationoftheseneedlesarereportedinthispaper.
简介:Inthistalkwefocusonthemechanicalproper-tiesofcellulargraphene(CG),andtheapplica-tionsofgraphene,andcellulargrapheneforsen-sors.Wereportanovel,facile,two-step,adaptableandscalablemethodofpreparingfree-standingCGwithtunabledensitiesandadjust-ableshapesandsizes.TheCGsamplesfabricated
简介:Studyoncontactlessultrasonicsensorandseamtracking¥HouWenkao;HuShengsunandZhaoJiaruiTianjinUniversityZhangShaobin(QingHuaUnive...