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简介：Byusingthemodernlydevelopedtechniquesofpossibilityandset-valuedstatistics,thispaperdeter-minedthethresholdsofvariouscategoriesofnoiseannoyanceanddefinedthedose-responserelationbe-tweenthelevelsofnoiseandtheirannoyance.Threefactorscontrolledintheexperimentweretypesofnoise:impulseandtraffic;levelofnoise:5Leqfrom45—85dB（A）;andperformancetask:withandwithoutspeechrecognition.NoiseinterferencewithspeechrecognitionwasmeasuredwiththeSDTmethod.Ourex-perimentalresultsshowedthatLeqofimpulsenoiseshouldbehigherthanthatoftrafficnoisetogetequalannoyance;thespeechrecognitiontaskmightlightentheexperienceofannoyance;thehigherthelevelofnoise,themoreitsinterferencewiththespeechrecognition,thatis,thelessthevalueofd′.

简介：为这个房间里的推动地的健全紧张测量的一个新系统是proposed.This测量系统由一个可重复的鼓舞声音组成在一个慢慢地旋转的平台上修理的来源和一个麦克风，它等价于由许多完美地匹配的microphones.The测试原则组成的一个圆麦克风数组被介绍，典型申请是在为这个房间里的推动地的健全紧张测量是的这个系统之上的described.Basedrealized.Therefore，不是仅仅时间而且

简介：Animpulseresponsetechniquehasbeeninvestigatedbyapplicationtotheopenscreensforobtainingsoundtransmissionloss.ThemeasurementsofsuchscreensaccordingtoISO140werealsopresented.ThepredictedresultscalculatedbyamodelwhichisbasedonHuygen’sprincipleandKirchhoff’sformulationhaveshowngoodagreementswiththeresultsobtainedbyimpulsemethod.Themethodrequiresnospecialistacousticfacilitiesandmeasurementsystemscanbeportable.

简介：Anoveladaptiveswitchingfilter(ASF)basedondirectionaldetectionisproposedfordenoisingtheimagesthatarehighlycorruptedbyimpulsenoise.Theproposedalgorithmemploysanefficientnoisedetectionmechanism.Itfirstemploysanefficientmethodtoestimatethedifferencesbetweenthecurrentpixelanditsneighborsalignedwith28directions.Thecurrentnoisepixelisreplacedbyamedianorameanvaluewithinanadaptivefilterwindowwithrespecttodifferentnoisedensities.Experimentalresultsshowthattheproposedapproachcannotonlyachieveverylowmiss-detectionratioandfalse-alarmratioevenuptohighnoisecorruption,butalsopreservethedetailedinformationofanimageverywell.

简介：Optimalswitchingandimpulsecontrolsforadistributedparametersystemsareconsidered.Weprovethatthevaluefunctionsu_u(·)ofapproximatingproblemsapproachtothevaluefunctionu(·)oftheoriginalproblem,whileu_u(·)istheuniqueviscositysolutionofthecorrespondingHamilton-Jacobi-Bellmansystem.Wealsoconstructanoptimalcontrolfortheoriginalproblemviathevaluefunctionu(·).

简介：Anumericalmodelisproposedforthesimulationofimpulsewavesgeneratedbylandslides.Thefluid-likelandslideismodeledasageneralizednon-Newtonianvisco-plasticfluid.Theconservativelevelsetmethodisextendedtothen-phaseflowandappliedtocapturetheinterfacesofair,waterandlandslide.Numericalresultsshowanexcellentperformanceofthecurrentmodeltocapturethewholeprocessofthelandslideandtheimpulsewavegeneration.

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简介：一台成双的单向性的推动汽轮机被建议了以便提高波浪精力植物的表演。这个汽轮机系统使用二台单向性的推动汽轮机，他们的流动方向与对方不同。然而，汽轮机特征没迄今为止被澄清。在稳定的流动条件下面的一台单向性的推动汽轮机的表演被在这研究与大活塞/柱体使用一条风隧道试验性地调查。然后，成双的推动汽轮机的效率被伪稳定的分析用试验性的结果估计了。

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简介：Oneofthemostcommonimageprocessingtasksinvolvestheremovalofnoisefromimages.Noisecanbeintroducedduringimagecapture,duringtransmission,orduringstorage.Fordesignpurposes,noisesourcesarefrequentlyapproximatedbyrandomvariableswithaknownprobabilitydistribution.Onecommonnoisemodelcorruptsasignalbyintroducingimpulses.Andthesurfaceoftheimagedisturbedbyimpulsenoisedisplaysmanypeaksorvales.Accordingtothecharacteristicofimpulsenoise,anovelalgorithmisproposedtothedetectionofimpulsenoisepointfromimagesbasedondirectionalderivatives.First,thetheoryofcalculusondirectionalderivativesisintroducedindetail.Thenitisappliedtothefieldofimagetoremovingnoisewiththediscreteformderivedfromitscontinuousmathematicalmodel.Andanumberofcontrastingsimulationsillustratethatouralgorithmnotonlycanpreservethestructureinformationwhileremovingimpulsenoisebutalsocanmostlysavethegrayvalueofthepixelsundisturbedbynoise.Inaddition,thecomparisonsofthefilteringperformanceforremovingimpulsenoiseareanalyzedindetailinthecaseofdifferentnoisedensities,andalsoshowthatthealgorithmsuggestedoutperformstheconventionalfilteralgorithmssuchasmeanfilter,medianfilterandsooninspeedandimpulsenoisereduction,especiallyinrandom-valuedimpulsenoisereduction.Soitisaverygoodalternativetotheexistingschemes.

简介：Thespatialimpulseresponse(SIR)methodisoftenusedasthe’goldstandard5insimulationoftransientacousticwavefieldsduetoitshighaccuracyinthelineardomain.However,ahighsamplingfrequencyisoftenrequiredinordertoachievethehighaccuracy.Asaresult,alargeamountofdatahastobeprocessed.Inthispaperafastapproachforcomputingspatialimpulseresponseisproposedtoreducethecomputationburden.TheproposedapproachisdevelopedbyemployingtherelationshipofSIRsatobservedpointsandSIRsoftheprojectionpointsonthetransducersurface.Twocriticalparametersusedintheproposedapproach,thecalculationsamplingfrequencyandtheinterpolationsamplingfrequency,arethenanalyzed.Resultsshowthatfora2.25MHzrectangulartransducerwiththesizeof5mmxlOmm,acalculationsamplingfrequencyof1000MHzandaninterpolationsamplingfrequencyof500MHzcanachievesuperiorperformancewhileimprovingthecomputationefficiency18timesthanthedirectsolving.

简介：WeinvestigatetheexponentialstabilityinthemeansquaresenseforthesystemswithMarkovianswitchingandimpulseeffects.BasedonthestatisticpropertyoftheMarkovprocess,astabilitycriterionisestablished.Then,bytheparameterizationsviaafamilyofauxiliarymatrices,thedynamicaloutputfeedbackcontrollercanbesolvedviaanLMIapproach,whichmakestheclosed-loopsystemexponentiallystable.Anumericalexampleisgiventodemonstratethemethod.

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简介：ThispaperpresentsthecomparisonofathreedimensionalComputationalFluidDynamics(CFD)analysiswithempiricalperformancedataofa0.6mimpulseturbinewithfixedguidevanesusedforwaveenergypowerconversion.Pro-Engineer,GambitandFluent6wereusedtocreatea3-Dmodeloftheturbine.Ahybridmeshingschemewasusedwithhexahedralcellsinthenearbladeregionandtetrahedralandpyramidcellsintherestofthedomain.Theturbinehasahub-to-tipratioof0.6andresultswereobtainedoverawiderangeofflowcoefficients.Themodelyieldedamaximumefficiencyofapproximately54%ascomparedtoamaximumefficiencyofaround49%fromexperiment.Adegreeofinsightintoflowbehaviour,notpossiblewithexperiment,wasobtained.

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简介：在这研究，为波浪精力变换与固定指南翼推进一台推动汽轮机的表演的改进以便完成，表演上的指南翼形状的效果被实验调查。调查被模型在稳定的流动状况下面测试执行。作为结果，因为转矩的增加，有3D指南翼的汽轮机的效率比有2D指南翼的汽轮机的稍微优异，这被发现指南翼，尽管越过为3D案例的汽轮机的压力落下为2D案例比那稍微高。关键词液体机械-推动汽轮机-指南翼-波浪精力变换CLC数字TK735

简介：Thispaperfocusesontheissueofcollaborativespectrumsensingincognitiveultrawideband(CUWB)impulseradio.Weemployenergy-basedsignaldetectionmethodandapplytheNeyman-Pearson(NP)decisionruletodeterminetheoptimumthreshold.Twocooperativespectrumsensingschemesaredevelopedinthispaper.Thedecisionfusionschemeisbasedonharddecision,inwhicheachcooperatingcognitiveuser(CU)sendsitsownlocaldecisiontothefusioncenter(FC).TheFCthenmakesafinaldecisionaccordingtothemajorityvotingrule.Alternatively,thedatafusionschemeisbasedonsoftdecision,inwhicheachlocalCUsendsitsobservedvaluedirectlytotheFC.TheFCcombinesthesevalues,comparestoathresholdandthenmakesthefinaldecision.Theperformancesofbothschemesarestudiedbyusinganalyticaltoolsandcomputersimulations.Thereceiveroperatingcharacteristics(ROC),whichrevealtheprobabilityofdetectionversusfalse-alarmcurve,areemployedtoevaluatethesystemperformanceunderdifferentscenarios.SimulationresultsdemonstratethatthedatafusionschemeoutperformsthedecisionfusionschemeandverifythatthecollaborativespectrumsensinghaspracticalimportanceinCUWBnetworks.