简介:Iftherewerenottheeconomiccrisis,Chineseeconomywerenotaffected,themarkethadstayedthesameastwoyearsagoorevenearlier,economiesintheeasterncoastalareashadmaintainedstrong,Midwesterneconomyhadbeenaplantwithplentyofshadow,innerlandportsstillfedeasterneconomy,maybethisunchangingconditionwillcauseavisual
简介:Avirtuallabsystemisthesimulationofrealdevicesandexperimentsusingcomputerandnetworktech-nology.Itcanmakeusersdoexperimentseasily,observeexperimentphenomenaandresultsthroughtheremotetermi-nal.Consequently,userscangetfinalresultstoverifyrelativetheory.Thearticleanalysesthefeaturesofvirtuallabsystems.Arealvirtuallabsystemnamed'MultimediaVirtualLabforDigitalCircuitLogicDesign(MVLDCLD)'whichhasbeendevelopedbytheauthorsandtheirgroupisalsopresented.
简介:技术突破推进了诊断成像的时间、空间的决定,并且3维(3-D)重建技术被介绍了进日常临床的实践。虚拟内视镜检查法(VE)是在3-D空格放大代表性的图象的感觉的一种非侵略的技术,提供病理学的区域和他们的包围结构的精确空间关系。许多计算机算法能被用来产生3-D图象,利用螺线计算了断层摄影术或磁性的回声成像(MRI)的在也固有的信息。VE图象通过空机关启用endoluminal航行,因此模仿常规内视镜检查法。几临床的研究验证了虚拟膀胱镜检查的诊断用途,它在膀胱肿瘤的察觉有高敏感和特性率。在肾盂,输尿管和尿道的虚拟探索的出版经验令人鼓舞却仍然少见。VE是一只保险箱,能与ureteropelvic连接阻塞在病人的长期的后续被使用的非侵略的方法,膀胱肿瘤和输尿管或尿道狭窄。它的主要限制是无能为组织病理学说的检查和联系电离放射危险提供活体检视织物标本(除非MRI被使用)。在endoluminal狭窄或阻塞的情况中,然而,VE向头部地允许虚拟endoluminal航行并且对小型机关枪的一种尾耳的片断。得出结论,VE提供评估泌尿道的一个不太侵略的方法,特别为比放射线学者不太熟悉代表性的成像的临床医生。
简介:BackgroundTheVisibleHumanProject(VHP)initiatedbytheU.S.NationalLibraryofMedicinehasdrawnmuchattentionandinterestsfromaroundtheworld.TheVisibleChineseHuman(VCH)projecthasstartedinChina.ThecurrentstudyaimsatacquiringafeasiblevirtualmethodologyforreconstructingthetemporalboneoftheChinesepopulation,whichmayprovideanaccurate3-Dmodelofimportanttemporalbonestructuresthatcanbeusedinteachingandpatientcareformedicalscientistsandclinicians.MethodsAseriesofsectionalimagesofthetemporalboneweregeneratedfromsectionslicesofafemalecadaverhead.Oneachsectionalimage,SOIs(structuresofinterest)weresegmentedbycarefullydefiningtheircontoursandfillingtheirareaswithcertaingrayscalevalues.Theprocessedvolumedataweretheninductedintothe3DSlicersoftware(developedbytheSurgicalPlanningLabatBrighamandWomen'sHospitalandtheMITAILab)forresegmentationandgenerationofasetoftaggedimagesoftheSOIs.3DsurfacemodelsofSOIswerethenreconstructedfromtheseimages.ResultsThetemporalboneandstructuresinthetemporalbone,includingthetympaniccavity,mastoidcells,sigmoidsinusandinternalcarotidartery,weresuccessfullyreconstructed.Theorientationofandspatialrelationshipamongthesestructureswereeasilyvisualizedinthereconstructedsurfacemodels.ConclusionThe3DSlicersoftwarecanbeusedfor3-dimensionalvisualizationofanatomicstructuresinthetemporalbone,whichwillgreatlyfacilitatetheadvanceofknowledgeandtechniquescriticalforstudyingandtreatingdisordersinvolvingthetemporalbone.
简介:Withthecombinationbetweensystemsimulationandvirtualreality,wehaveestablishedanintegratedvirtualrefinerysimulationplatform,andanalyzedtheoveralldesignandprincipalarchitecture.Thispaperintroducesasimulationalgorithmaboutarefinerybasedonvirtualreality,andexplainshowthealgorithmcanbeappliedtothevirtualrefineryintegratedsimulationplatformindetail.Thevirtualrefinerysimulationplatform,whichconsistsofathree-dimensionalscenesystem,anintegrateddatabasesystemandadynamic-staticsimulationsystem,hasmanyapplications,suchasdynamic-staticsimulationofkeyprocessunitusedasprocesscontrolandoiltankblendingsimulationforscheduling.Withthevisualizationandhuman-computerinteractionforacquiringproductionandprocessdata,thisplatformcanprovideeffectivesupportsonstafftrainingrelatedwithmonitoring,controlandoperationinrefinery.Virtualrefinerycanalsobewebpublishedthroughtheinternetanditishelpfulforthedistancetrainingandeducation.
简介:在过去几年里,联网放技术的RTK,特别VRStechnology,广泛地在全世界在中国的一些部分并且在许多国家被使用了。VRS技术的Theprinciple与相应公式推理被讨论,并且详细说明了对修正和虚拟观察产生算法被给的VRS的描述和应用。放的GPS虚拟参考车站(VRS)基于多重参考车站是一种网络RTK技术。至少三个参考车站与这种技术,和参考车站的测地学的坐标被需要精确被知道。这些引用车站连续地追踪GPS卫星的信号以便决定散andnon散的偏爱。那些偏爱能被插入内推到虚拟参考车站,因此ther在上能在VRS附近利用那个信息得到更好的放精确性。同时,漫游者不得不把他们的近似坐标送到处理中心的一个数据(通常主人参考车站)以便虚拟观察能根据漫游者的近似坐标和散、非散的偏爱的修正在近似坐标被产生。事实上,VRS完全在近似坐标被建立。通常,近似坐标从其精确性能在米被控制的放的假范围单身者被获得或十米。因为很突然,在VRS和漫游者之间的基线正在意味着在漫游者和VRS之间的一些基于距离的偏爱的高连贯,更好的结果能从traditionaldouble微分的位置方法被导出。
简介:Amachine,orothertypeof“system”,canoftenbedividedintoseveralsubsystems(components)andthesesubsystemsagaincanbedividedintosevreralsubsystems(secondgeneration).Thisprocessformsasystemtree.Toassessthereliabilityofthemachinebasedondatafromthetrialsofcomponentsofthemachine,virtualsystemmethodisemployed.ItisprovedinthepaperthatthelowerconfidentlimitofthereliabilityofthemachinesetbythevirtualsystemmethodislevelconsistentandasymptoticallyoptimalwhiletheonesetbyLindstrom-Maddensmethodisnot.
简介:Wepresentamethodtorepresentmulti-resolutionvectorgraphicssuchasroadnetworksorrailwaynetworksinvirtualenvironment.Thesevectordatacanbeinteractivelyeditedandthelandscapeandbeexploredinrealtimeatanyaltitudefromflightviewtocarview.Wedesignacontext-focusedvectordescriptionoflinearcanarealfeatures,withassociatedcustomizeddefinitionpaintertospecifytheirappearance(colorandmaterial)andtheirdisplaymode(detailedmodeorsimplifiedmode).Therearesomespecialproblemsindrawingvectorgraphicsinvirtualenvironment.Floating-pointround-offerrorappearwhenweusealowviewpointtoobservethescene,anditleadstoscenejittering.Drawing3Dwidelinesturnsintoaproblemon3Dterrain.Wedesignaview-basedself-adaptiveinterpolationalgorithmandanoffsetlinegeneratingalgorithmtosolveit.Ourresultsshowhighperformancewithgoodvisualquality.
简介:Memberenterprisesengagedinavirtualenterprisearepronetoshirkbothproductiveeffortsandrisksbecausetheireffortsareunobservabletoanyothermemberenterprises.Howtodesignarevenuesharingcontracttopreventthememberenterprisesfromfreeridingisoneofthemostimportantissuestobeconsideredtocutdownrisksthatvirtualenterprisesmaymeet.Basedontheworkofprofitsharinginpartnershipsandtheresearchonrevenuesharinginsupplychainsandjointventures,weproposeamodeloftherevenuesharingcontractaimedatcoordinatingavirtualenterprisecomposedofnrisk-aversememberenterpriseswhereeverymemberenterpriseperformsdifferenttasksandcontributesdistinctcoreresources.Wecharacterizetheoptimalproductiveefforts,risk-takenandincentiveintensityintherevenuesharingcontract,andindicatethatimprovingtheevaluationprecisionofproductiveeffortsandselectingweaklyrisk-aversememberenterpriseswithclosepowerarethekeyfactorstothesuccessofVEs.