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  • 简介:Ithasbeendebatedthatwhichofrasterandvectoristhemosteffective,fromtheviewpointsofstorageefficiency,processingefficiency,andabilitytocapturetheessenceofgeographicspaceforanapplication.Theremaybenoclearanswertothisdebate.Itseemsappropriatetonotethatthemaindifferencebetweenthemrelatestothedegreetowhichthespatialentitiesofinterestareexplicitinthedata. Ingeneral,rasterremotesensingimageallowstheinvestigatortomeasureandmonitorsurfaceelectromagneticwavevariationinwhichmostobjectsandthespatialinterrelationshipsbetweenthemareimplicit.Inpractice,therearemanypoorlyunderstoodtradeoffsincouplingremotesensingdatatoexistingthematicmaps.Mapsusepointsandlinestorepresentselectedfeaturesoftheenvironmentinageneralizedfashion,buttheobjectssuchasindividualpolygons,linesandpointswithinanimagearetypicallyunknown.  TheintegrationofremotesensinginformationintoaGISoccursnaturallyinarasterGISbecausebothdatastructuresareapproximatelythesame.Integrationintoavectorsystemrequiressomewhatmoreeffort,butithasbeenrecentlyachievedbyseveralGISandremotesensingvendors.Whenoneisstoringalargeamountofimagedatarelatedtosomeapplicationsintoaspatialdatabasesystem,itisnotpossibletoprocessthedataandtoobtainpolygonalrepresentationsofallobjectsthatwillbeofinteresttousersinadvance.Ontheotherhand,itmightbeofgreatvalueinsuchasystemtohaveavectorrepresentationofcertainimportantobjects.Forthisapplication,oneneedstodesignasystemwithbothrasterandvectorcapabilities,aswellastoolstointerrelatethem.Especially,asinFig.1,weneedtoprocessbothrasterandvectorsimultaneously.  Asdescribedabove,whileaspatialinformationsystemmayhaveseveraldatastructures,thesystemcouldbeextendedinseveralwayswhichcorrespondtothefollowingdifferentproperties(seeFig.2): 1)Thestuructureinforma

  • 标签: GRANULARITY the INTEGRATION of RS and
  • 简介:Watershedmanagementisanever-evolvingpracticeinvolvingthemanagementofland,water,biota,andotherresourcesinadefinedareaforecological,social,andeconomicpurposes.Inthispaper,weexplorethefollowingquestions:Howhaswatershedmanagementevolved?Whatnewtoolsareavailableandhowcantheybeintegratedintosustainablewatershedmanagement?Toaddressthesequestions,wediscusstheprocessofdevelopingintegratedwatershedmanagementstrategiesforsustainablemanagementthroughtheincorporationofadaptivemanagementtechniquesandtraditionalecologicalknowledge.Weaddressthenumerousbenefitsfromintegrationacrossdisciplinesandjurisdictionalboundaries,aswellastheincorporationoftechnologicaladvancements,suchasremotesensing,GIS,bigdata,andmulti-levelsocial-ecologicalsystemsanalysis,intowatershedmanagementstrategies.WeusethreecasestudiesfromChina,Europe,andCanadatoreviewthesuccessandfailureofintegratedwatershedmanagementinaddressingdifferentecological,social,andeconomicdilemmasingeographicallydiverselocations.Althoughprogresshasbeenmadeinwatershedmanagementstrategies,therearestillnumerousissuesimpedingsuccessfulmanagementoutcomes;manyofwhichcanberemediedthroughholisticmanagementapproaches,incorporationofcutting-edgescienceandtechnology,andcross-jurisdictionalcoordination.Weconcludebyhighlightingthatfuturewatershedmanagementwillneedtoaccountforclimatechangeimpactsbyemployingtechnologicaladvancementsandholistic,cross-disciplinaryapproachestoensurewatershedscontinuetoservetheirecological,social,andeconomicfunctions.Wepresentthreecasestudiesinthispaperasavaluableresourceforscientists,resourcemanagers,governmentagencies,andotherstakeholdersaimingtoimproveintegratedwatershedmanagementstrategiesandmoreefficientlyandsuccessfullyachieveecologicalandsocio-economicmanagementobjectives.

  • 标签: 流域综合管理 地理信息系统 社会生态 流域管理 经济功能 演变
  • 简介:ShoemakingisoneoftheareaswhereCAD/CAMapplicationisrapidlyincreasing.Thispaperintroducesanintegratedcomputeraidedshoemakingsystemincludinghumanfootmeasuring,last(woodenmodel)measuring,lastCAD/CAMandpatternCAD/CAM.Theprojectwassupportedbythe7thnationaleconomical5yearplan.Hightechnologies,suhasdigitalimageprocessing,patternrcognition,advancedgeometricalmodelingandaseriesofsophisticatedequipmentsanddevicesareap-pliedinthisintegratedsystem.Partsofthesystemhavebecomecommercialproducts.

  • 标签: Shoe-Making Digital PHOTOGRAMMETRY CLOSE RANGE Measuring
  • 简介:计划的三维的设计和轮船建设在这篇论文被描述的建模集成轮船的虚拟轮船汇编的一个新方法。模拟基于虚拟轮船汇编进程当模特儿的一个工作流模型也被建立;而且,在三维的设计和轮船建设计划的轮船之间的信息转变的一个方法被提出。满足在轮船在不同系统之间分享的信息的要求虚拟汇编,一个模拟数据库被使用软件工程设计方法和关系数据模型创造。用这个数据库的应用程序,轮船的信息三维的设计,计划的构造,和虚拟汇编能集成于一个系统。随后,这个新方法作为一个工具被使用模仿一艘轮船的虚拟集会,并且结果保证它的合理性和可靠性。

  • 标签: 集成建模方法 船舶建造 虚拟装配 关系数据模型 三维设计 信息共享
  • 简介:Akindofnovelbinaryphasecodenamedsidelobesuppressioncodeisproposedinthispaper.Itisdefinedtobethecodewhosecorrespondingoptimalsidelobesuppressionfilteroutputstheminimumsidelobes.Itisshownthattheredoexistsidelobesuppressioncodesbetterthantheconventionaloptimalcodes-Barkercodes.Forexample,thesidelobesuppressioncodeoflength11withfilteroflength39hasbettersidelobelevelupto17dBthanthatofBarkercodewiththesamecodelengthandfilterlength.

  • 标签: 双相编码 旁瓣抑制 最优码 滤波长度
  • 简介:ThispapergivesanoverallintroductiontothebasicconceptofLAC(location-awarecomputing)anditsdevelopmentstatus,putsforwardanintegratedlocation-awarecomputingarchitecturewhichisusefulfordesigningthereasonablelogicalmodelofLBS(location-basedservice).Finally,abriefintroductionisconductedonaLACexperimentalprototype,whichactsasamobileurbantourismassistant.

  • 标签: 空间信息服务 地理信息系统 局部计算 分层结构 逻辑模型
  • 简介:Numericalsimulationofinjectionmoldinghavehadsuccessinpredictingthebehaviorofpolymermeltinextremelycomplicatedgeometries.Mostofthecurrentnumericalsolutionsarebasedonfinite-element/finite-difference/boundary-element/volume-controlmethodsandthesurfacemodel.ThispaperdiscussesthedevelopmentofanintegratedCAEsystemforinjectionmoldingindetail,andpresentsthemathematicsfornumericalsimulationoffilling,packing,cooling,stressandwarpageininjectionmolding.ThedevelopedsystemnamedasHsCAE3Disintroducedattheend.

  • 标签: INJECTION MOLDING NUMERICAL simulation CAD/CAE/CAM object-orientedanalysis
  • 简介:Inthispaper,wepresentsimulationresultsofanelectroopticalvariableopticalattenuator(VOA)inte-gratedinsilicon-on-insulatorwaveguide.Thedeviceisfunctionallybasedonfreecarriersabsorptiontoachieveattenuation.Beampropagationmethod(BPM)andtwo-dimensionalsemiconductordevicesimu-lationtoolPISCES-Ⅱwereusedtoanalyzethedcandtransientcharacteristicsofthedevice.Thedevicehasaresponsetime(includingrisetimeandfalltime)lessthan200ns,muchfasterthanthethermoopticandmicro-electromechanicalsystems(MEMSs)basedVOAs.

  • 标签: 硅基绝缘体 VOA 光电器件 衰减器 PISCES-Ⅱ 仿真
  • 简介:TheAndroidplatformisthemostpopularmobileoperatingsystem.WiththeincreaseofthenumberofAndroidusers,alotofsecurityissueshaveoccurred.InordertodetectthemaliciousbehaviorsfortheinstalledAndroidApps,inthispaper,weproposeanAndroidmalwaredetectingschemebyintegratingstaticanddynamicanalysismethods.WeuseAndroguardandDroidBoxtoextractthefeatures,andthenremovetheirrelevantfeatures.Thenweemploythesupportvectormachine(SVM)toclassifytheAndroidmalwareandbenignware.Fromtheresultofourproposedscheme,theproposedintegratedstaticanddynamicanalysisschemewithSVMcaneffectivelydetecttheAndroidmalware.

  • 标签: 恶意软件 动态集成 分析方案 静态 动态分析方法 支持向量机
  • 简介:Overthelast20years,siliconphotonicshasrevolutionizedthefieldofintegratedoptics,providinganovelandpowerfulplatformtobuildmass-producibleopticalcircuits.Oneofthemostattractiveaspectsofsiliconphotonicsisitsabilitytoprovideextremelysmallopticalcomponents,whosetypicaldimensionsareanorderofmagnitudesmallerthanthoseofopticalfiberdevices.Thisdimensiondifferencemakesthedesignoffiberto-chipinterfaceschallengingand,overtheyears,hasstimulatedconsiderabletechnicalandresearcheffortsinthefield.Fiber-to-siliconphotonicchipinterfacescanbebroadlydividedintotwoprinciplecategories:in-planeandout-of-planecouplers.Devicesfallingintothefirstcategorytypicallyofferrelativelyhighcouplingefficiency,broadcouplingbandwidth(inwavelength),andlowpolarizationdependencebutrequirerelativelycomplexfabricationandassemblyproceduresthatarenotdirectlycompatiblewithwafer-scaletesting.Conversely,out-of-planecouplingdevicesofferlowerefficiency,narrowerbandwidth,andareusuallypolarizationdependent.However,theyareoftenmorecompatiblewithhigh-volumefabricationandpackagingprocessesandallowforon-waferaccesstoanypartoftheopticalcircuit.Inthispaper,wereviewthecurrentstate-of-the-artofopticalcouplersforphotonicintegratedcircuits,aimingtogivetothereaderacomprehensiveandbroadviewofthefield,identifyingadvantagesanddisadvantagesofeachsolution.Asfiber-to-chipcouplersareinherentlyrelatedtopackagingtechnologiesandtheco-designofopticalpackageshasbecomeessential,wealsoreviewthemainsolutionscurrentlyusedtopackageandassembleopticalfiberswithsilicon-photonicintegratedcircuits.

  • 标签: COUPLING STRATEGIES SILICON
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  • 简介:Duringthelong-termhumandevelopment,theformationofthelanguagehasitsownnationalcharacteristics.Languageisahumanspecificsymbolsystem,culturalrubyandoneofthemostimportantcarriersofculture.Theproduction,economiclife,geography,religion,andsoonarereflectedinthelanguage.Loveiseternaltopicandlovewordshaveverydeeprichculturalimplication.Forthousandsofyears,peoplepraisebeautifulloveandaffection.ThispaperwilltakelovewordsforexampletolookintoChineseandWesternculturalcharacteristics.

  • 标签: symbol system CARRIER LOVE LOVE WORDS