简介：

简介：

简介：因为他们的广泛的应用，无人的表面车辆(USV)成为了研究的一个焦点。保证安全和可靠性并且独立地执行复杂任务，USV被要求拥有环境和有效碰撞回避能力的精确感觉。完成这些，进实时海洋的雷达目标察觉的调查和自治碰撞回避技术被要求，瞄准解决噪音堵塞，在海洋的雷达中的不平的亮度，目标损失，和盲目区域的问题想象。这些技术应该也满足要求即时并且与USV的高航行速度有关的可靠性。因此，这研究基于海洋的雷达开发了一个嵌入的碰撞回避系统，调查了包含适应变光滑的算法和柔韧的分割算法的一个高度即时的目标察觉方法，开发了一个马厩和可靠动态本地环境模型保证USV的安全航行，并且基于调整USV标题和速度在的速度障碍(V障碍)构造了一个碰撞回避算法即时。在多障碍回避的海试用结果第一表明建议回避系统的有效性和效率，然后当时，验证它的大适应性和相对稳定性航行在真实、复杂的海洋的环境的USV。获得的结果将改进USV的聪明的水平并且保证USV独立人士航行的安全。

简介：BasedontraditionalChinesephilosophy,westudythemoderneco-tourismandenvironmentalethicsanditsimplications.Firstly,theeco-tourismandenvironmentalethicsweredefined;Secondly,theChinesephilosophyofConfucianismandTaoismrelatedtotheconceptofeco-tourismandenvironmentalethicswerereviewed;Finally,weprovideimplicationstothepractitionersandexpertsofenvironmentinChina.

简介：Satelliteconstellationdesignforspaceopticalsystemsisessentiallyamultiple-objectiveoptimizationproblem.Inthiswork,totacklethischallenge,wefirstcategorizetheperformancemetricsofthespaceopticalsystembytakingintoaccountthesystemtasks(i.e.,targetdetectionandtracking).Wethenproposeanewnon-dominatedsortinggeneticalgorithm(NSGA)tomaximizethesystemsurveillanceperformance.Paretooptimalsetsareemployedtodealwiththeconflictsduetothepresenceofmultiplecostfunctions.Simulationresultsverifythevalidityandtheimprovedperformanceoftheproposedtechniqueoverbenchmarkmethods.

简介：

简介：

简介：

简介：Thispaperpresentsacompacttriple-bandbandpassfilterbasedonmetamaterials.Theminiaturizationisrealizedbytheprincipleofphasecompensationofmetamaterial.Comparedwiththeconventionalhalf-wavelengthfilter,themetamaterialfilterhasasmallsizeof10mm×10mm.Thetriple-bandbandpassfilterperformancehasbeenvalidatedbytheelectromagneticsimulationsoftwareofhighfrequencystructuresimulator(HFSS).Theresultsillustratethatthefilterisdesignedwithcenterfrequenciesof2.4GHz,5.1GHzand8.8GHz,bandwidthsofabout7.9%(2.31—2.50GHz),7.8%(5.0—5.4GHz)and7.4%(8.50—9.15GHz),respectively,anditshowsgoodbandpasscharacteristics.

简介：ExtensionPrinciplesplayasignificantroleintheconstructionofMRAbasedwaveletframesandhaveattractedmuchattentionfortheirpotentialapplicationsinvariousscientificfields.AnovelandsimpleprocedurefortheconstructionoftightwaveletframesgeneratedbytheWalshpolynomialsusingExtensionPrincipleswasrecentlyconsideredbyShahin[TightwaveletframesgeneratedbytheWalshpolynomials,Int.J.Wavelets,Multiresolut.Inf.Process.,11(6)(2013),1350042].Inthispaper,weestablishacompletecharacterizationoftightwaveletframesgeneratedbytheWalshpolynomialsintermsofthepolyphasematricesformedbythepolyphasecomponentsoftheWalshpolynomials.

简介：Orthogonalfrequencydivisionmultipleaccess(OFDMA)isapopularandwidelyacceptedmultipleaccesstechniquetoprovidehighdatarateservicesinamobileenvironmentintheareaofwirelesscommunications.OFDMAcanprovidebetterflexibilityinallocatingtheradiospectrabyutilizingsubcarrierallocations,scheduling,andenergycontroltoobtainmulti-dimensiondiversitygains.Duetoitsresourceallocationflexibility,OFDMAhasbeenwidelyusedasagreenairinterfacetechnologyfortheemergingbroadbandwirelessaccessnetworks.ThispaperextensivelyaddressestheintegrationofgreenOFDMAtothefutureairinterfacetechnologies,forinstance:two-tiercellular,multiradioaccesstechnologies(RATs),FemtoCell,andrelaynetworks.ThemainfocusofthepaperistoreviewandanalyzethecurrentOFDMAtechniquestoaddressthegreenresourceallocationinmultiuserdiversity,wherethecriticalconstraintsarethecomputationalcomplexity,energyefficiency,andthesub-channelassignment.ThefuturetrendofOFDMAbasednetworkswillaimtomaximizetheenergyefficiencyoftheexclusivechannelassignmentthroughajointsub-channelandpowerallocationtoaccommodatehighdatatrafficnetworksspeciallytherelaybased5Gcellularnetworks.

简介：Supportvectormachines(SVMs)havebeenintensivelyappliedinthedomainsofspeechrecognition,textcategorization,andfaultsdetection.However,thepracticalapplicationofSVMsislimitedbythenon-smoothfeatureofobjectivefunction.Toovercomethisproblem,anovelsmoothfunctionbasedonthegeometryofcircletangentisconstructed.Itsmoothesthenon-differentiabletermofunconstrainedSVM,andalsoproposesacircletangentsmoothSVM(CTSSVM).Comparedwithothersmoothapproachingfunctions,itssmoothprecisionhadanobviousimprovement.TheoreticalanalysisprovedtheglobalconvergenceofCTSSVM.NumericalexperimentsandcomparisonsshowedCTSSVMhadbetterclassificationandlearningefficiencythancompetitivebaselines.

简介：在小学英语教学中运用任务型教学法，让学生通过完成具体的任务来学习，不仅可以激发兴趣，培养能力，落实和体现以学生为主体的理念，而且还可以培养合作精神和创新能力，实现learningbydoing教学理念。任务型语言教学通常由三个教学阶段组成，即布置任务，形成目标，激发兴趣；执行任务，合作学习，运用英语；完成任务，客观评价，深化学习。

简介：SinkiangMuqammusic,whichisacombinationofsong,dance,music,folk-customandliterature,isinthelistofWorldIntangibleCulturalHeritage.ItisdistributedindifferentregionsinSinkiang.Becauseofthedifferentinheritanceregionsaswellasthedifferentinfluenceofhistoryandculture,thereformedMuqammusicofdifferentregionstyle,furtherpresenteddifferentartisticstyle.ThisarticlepresentsamethodtointuitivelyshowtheinheritancedistributionoffourkindsofMuqammusicinSinkiangbasedonscalablevectorgraphicstechnology,itprovidesmethodsandtoolsofvisualizationresearchontheprotectionandinheritanceofMuqammusic.

简介：Thispaperpresentsahumanactionrecognitionmethod.Itanalyzesthespatio-temporalgridsalongthedensetrajectoriesandgeneratesthehistogramoforientedgradients(HOG)andhistogramofopticalflow(HOF)todescribetheappearanceandmotionofthehumanobject.Then,HOGcombinedwithHOFisconvertedtobag-of-words(BoWs)bythevocabularytree.Finally,itappliesrandomforesttorecognizethetypeofhumanaction.Intheexperiments,KTHdatabaseandURADLdatabasearetestedfortheperformanceevaluation.Comparingwiththeotherapproaches,weshowthatourapproachhasabetterperformancefortheactionvideoswithhighinter-classandlowinter-classvariabilities.IndexTermsBag-of-words(BoWs),densetrajectories,histogramofopticalflow(HOF),histogramoforientedgradient(HOG),randomforest,vocabularytree.

简介：ThetraditionalorientedFASTandrotatedBRIEF(ORB)algorithmhasproblemsofinstabilityandrepetitionofkeypointsanditdoesnotpossessscaleinvariance.Inordertodealwiththesedrawbacks,amodifiedORB(MORB)algorithmisproposed.Inordertoimprovetheprecisionofmatchingandtracking,thispaperputsforwardanMOKalgorithmthatfusesMORBandKanade-Lucas-Tomasi(KLT).ByusingKalman,theobject’sstateinthenextframeispredictedinordertoreducethesizeofsearchwindowandimprovethereal-timeperformanceofobjecttracking.TheexperimentalresultsshowthattheMOKalgorithmcanaccuratelytrackobjectswithdeformationorwithbackgroundclutters,exhibitinghigherrobustnessandaccuracyondiversedatasets.Also,theMOKalgorithmhasagoodreal-timeperformancewiththeaverageframeratereaching90.8fps.

简介：DifferencesbetweentheCenozoicandpre-CenozoicstrataandstructuresinthemiddlesouthSouthYellowSeaareanalyzedusinghigh-resolutionairbornegravitydatacombinedwithdatafromoffshorewells,seismicexplorationandtheregionalgeologicalbackground,usingforwardandinversemethods.WediscusswhyhydrocarbonexplorationhassofarfailedintheSouthYellowSea,andputforwardalternativefutureexplorationplans.TheresultsshowthattherearethickCenozoicstrataoverJurassic–CretaceouscontinentalstratainthesouthernbasinoftheSouthYellowSea,contrastedwiththickMid-Paleozoicmarinestratapreservedinthemiddleupliftarea.Inthemid-southernSouthYellowSea,airborneBouguergravityanomaliesarefragmentizedwithscatteredlocalanomalies.ManytensilenormalfaultsandminorfaultblocksoccurintheCenozoicstrata.Incontrast,reversefaultsandnappestructuresarefoundinpre-Cenozoicstrata.Theessentialreasonsforthelackofabreakthroughinhydrocarbonexplorationarethecomplexityofgeologicalstructures,hydrocarbonaccumulationenvironments,seismic-geologicconditions,andthedifficultyofinterpretingandunderstandingthesefeatures,ratherthananimbalanceofexplorationframework.HydrocarbonexplorationshouldbetargetedatMid-Cenozoiccontinentalstrata,especiallyofPaleogeneage,inthemiddletosouthernpartsoftheSouthYellowSea.SpecialattentionshouldbepaidtothefavorablestructuralbeltsSYI1,SYI2,SYI3andSYI4inthesouthernbasinoftheSouthYellowSea,wheredetailedseismicexplorationordrillingshouldbecarriedout.AttentionshouldalsobegiventoMid-PaleozoicmarinestratainthemiddleupliftareaoftheSouthYellowSea.Keystrategiesthatcouldleadtoahydrocarbonexplorationbreakthroughareimprovingexplorationresolution,conductingdetailedstudiesoffinestructures,andaccuratelylocatingminorstructures.

简介：Theproblemofcloudcooperationofmilitaryserviceproviders(MSPs)isaddressedforallocatinglimitedresourcestomilitaryserviceusers(MSUs)thataregeographicallydistributed.TheMSPs,alsocalledmilitaryorganizationclouds,arevirtualizedandencapsulatedbytheservicestheycanofferandeachofthemcontainsdifferentkindsofresourcesthatMSUneeds.TheMSPsarealsogeographicallydispersed.TheyarerequiredtoallocatetheirresourcestotheMSUcomplyingwiththecorrespondingqualityofservice(QoS),sothateachMSUgatherstheservicesitneedstoguaranteeitstasktobeimplemented.TheoutlineofmilitaryorganizationcloudcooperationisdiscussedandthemethodofserviceoptimalselectionisproposedbasedonQoSevaluation.TheQoSevaluationmethodbasedonexponentialapproximationisputforwardtoincludetheusers’will.Simulationresultsverifytheeffectivenessoftheproposedalgorithm.

简介：Weaddnewmodulesforreceiverlunction(RF)analysisinSplitLabtoolbox,whichincludesthemanualRFanalysismodule,automaticRFanalysisandrelatedqualitycontrolmodules,andH-kstackingmodule.Theupdatedtoolbox(namedSplitRFLabtoolbox),especiallyitsautomaticRFanalysismodule,couldcalculatetheRFsquicklyandefficiently,whichisveryusefulinRFanalysiswithhugeamountofseismicdata.ChinaisnowconductingtheChinArrayprojectthatplanstodeploythousandsofportablestationsacrossChinesemainland.OurSplitRFLabtoolboxmayobtainreliableRFresultsquicklyatthefirsttime,whichprovideessentiallynewconstrainttothecrustalandmantlestructures.

简介：为增加的目的在里面polycation基因搬运人的vivo稳定性，我们准备了一种pH敏感poly(乙烯乙二醇)-poly(-benzyl-L-glutamate-co-glutamic酸)(木钉针网阵列(65)，65表示glutamic酸的臼齿的比率在poly(-benzyl-L-glutamate-co-glutamic酸))。木钉针网阵列(65)显示出低cytotoxicity并且能高效地防护DNA/PEI(1:1)polyplexes的正电荷。transfection被提高由于部分收费在7.4的pH在HeLa房间线防护。有几乎没有transfection效率当第三的粒子的表面费用转到时在7.4的pH否定。然而，transfection效率在transfection的开始在6.0的pH由culturing恢复了很多。共焦的显微镜的观察和流动cytometry结果证明DNA/PEIpolyplexes应该高效地被释放并且在pH的endocytosized6.0，因为pH木钉针网阵列(65)的触发的deshielding行动。由于好biocompatibility和合适的pH触发了shielding/deshielding性质，木钉针网阵列(65)能是为在vivo使用的polycationic基因搬运人的一个潜在的防护系统。