学科分类
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45 个结果
  • 简介:Threekeyfactorsarediscussed,whichaffectpositioningaccuracyofrange-rangepositioningmodeandhyperbolicpositioningmode.Basedontheerrorellipticaltheory,theexpressionsofpositioningerrorandofpositioninggeometricfactorofrange-rangepositioningmodeandhyperbolicpositioningmodearederived,andthepositioningerrorandtheblindpositioningareaoftwodifferentpositioningmodesareanalyzed.Accordingtotherequirementofnavigationarea,anoptimumpositional

  • 标签: RADIO NAVIGATION range- RANGE POSITIONING MODE
  • 简介:Inthe20yearsaftertheUNEnvironmentandDevelopmentConferencein1992,theessentialissuesinrelationtosustainabledevelopmenthavebeenunsolved.Theupcoming"Rio+20"conferenceputthefocusontheshifttowardsgreendevelopment.Toachievethisrequiresthechangeofsomeideologiesthatdominatehumanactions,suchastheconceptsofwealth,welfareandsecurity,anditalsorequireidentifyingthenewpositionofnatureresources,especiallythepositionofforest.Itwaspointedoutinthepaperthatforestisthefoundationofsocioeconomicdevelopmentandconstitutesbasicwealth,basicwelfareandbasicsecurityofthewholecommunityunderthegreendevelopmentcontext.Nevertheless,itisamusttoaggressivelyinvestanddevelopgreeneconomy.Itwasalsoproposedtosetupforestrydevelopmentorganizations,investmentmechanisms,policysystemandresearch&educationsystemcompatiblewithgreendevelopment.Moreover,someforestrypoliciesthatshouldberevisedwerecombed.

  • 标签: green DEVELOPMENT position of FOREST SUSTAINABLE
  • 简介:我们在原生生物Trichomonasvaginalis的最近的调查与120.9nt的单位长度建议了DNA顺序频率,它为放的nucleosome代表顺序签名。我们现在在更高的优核质扩大了我们的观察并且在Caenorhabditiselegans在长度识别了175nt的类似的频率。在定义顺序的过程组合特征,我们发现10.5-nt频率,DNA双螺旋的顺序签名,不能为放的cross-nucleosome足够,但是提供指导栏杆便于的必需品放。我们推进把的保护nucleosome的序列并且从第5'-e识别了一个强壮的积极嘌呤(AG)坡度到第3'-e,并且当嘌呤内容断然与GC内容被相关,也听说充实nucleosome的区域作为与nucleosome免费的序列相比GC富有。顺序描述允许我们开发一个隐藏的Markov模型(唔)为译码nucleosome放的算法计算地,并且基于从C的第五个染色体的一套训练数据。elegans,我们的算法比随机的放预言了放得好的nucleosomes的60%-70%,它高是15%-20%。我们断定nucleosomes随机没在DNA序列上被放并且还与可变稳定性,DNA上的放得好的nucleosomes叶子顺序签名,并且到对面的nucleosomes的统计的放绑在不同染色体区域染色体能基于这些顺序签名计算地被译码。

  • 标签: DNA序列 定位计算 核小体 签名 线虫 隐马尔可夫模型
  • 简介:鉴于在在波浪前面构造方法的非常规的四边的格子和常规矩形格子节点之间的相对的放问题,有放方法的四个格子的具体实现问题(向量十字产品判断,角度和,交叉点,并且签署比较算法)在通常在计算机被使用的波浪前面建设,图形在这被比较并且分析纸。在在波浪前面建设在非常规的四边的格子和常规矩形格子节点之间放的亲戚的实现基于地点方法,向量十字产品判断方法更快的计算例子表演和比另外的方法精确的更多的稳定性分析。它为移植和demigration的下一步提供精确格子点属性价值。

  • 标签: 波前工程 网格节点 点定位 四边形网格 计算机图形 稳定性分析
  • 简介:Beampositioningstabilityinalaser-driveninertialconfinementfusion(ICF)facilityisavitalproblemthatneedstobefixed.Eachlaserbeaminthefacilityistransmittedinlotsofopticsforhundredsofmeters,andthentargetedinamicro-sizedpellettorealizecontrollablefusion.Anyturbulenceintheenvironmentinsuchlong-distancepropagationwouldaffectthedisplacementofopticsandfurtherresultinbeamfocusingandpositioningerrors.Thisstudyconcludedthattheerrorsoneachoftheopticscontributedtothetarget,anditpresentsanefficientmethodofenhancingthebeamstabilitybyeliminatingerrorsonerror-sensitiveoptics.Optimizationsoftheopticalsystemandmechanicalsupportingstructuresarealsopresented.

  • 标签: BEAM stability BEAM PROPAGATION sensitivity LASER
  • 简介:Theidealmodelofhumanrightslawstudiesshallbeonethatisopenandcomprehensive.Onthebasisofnormativelegalstudies,itshallpaymoreattentiontoandrespondtopolitical,economic,andsocialdevelopmentinawiderangeofhumanrightsissues.Thesestudiesshouldattempttofindpracticalsolutionstoconcreteproblems.Humanrightslawshouldbearelativelyindependentlegaldiscipline,anditshouldbeaproblem-orientedobjectofstudy.Regardingtheresearchmethodologies,humanrightslawcouldencompassallaspectsoflegalstudies,andgobeyondlegalthemtosomeextenttoencompasstheinfluenceofotherdisciplines.

  • 标签:
  • 简介:Aseriesofadvantagesofsingledifference(SD)andundifferenced(ZD)modelsaregivenascomparedwitythedoubledifferenceezistinSDandZDmodels.Thereparameterizationmethodisprovidedtoresolvethisrankdefectproblembyestimatingsomecombinationsoftheunknownsratherthantheunknownsthemselves.TherepatameterizationofSDandZDfunctionalmodelsisdiscussedindetailwiththeirstochasticmodels.Thetheoreticalcomformationoftheequivalenceofundifferencedanddifferencedmodelsisdescribedinastraightforwardway.TherelationshipbetweenSDandZDresidualsisgivenandverifiedforsomespecialpurposes,e.g.researchonthestochasticalpropertiesofGPSobservations.

  • 标签: 全球定位系统 GPS SD模型 DD模型 定位误差 秩亏
  • 简介:马达的配置被设计,动态分析方程基于它的简化模型被推出。利用栅栏的一个严峻的系统被设置测试这台新马达,和理论运动原则因为马达被实验证明。脉搏波形被使用驱使马达搬到步。马达有10nm和0.6mm/s的最大的速度的一个排水量决定。它能驾驶其范围是20公里的200g滑块。放站台的一个维的精确被使用新混合压电的马达制作。原型由二台伺服马达和二台压电的马达组成,它被一台计算机自动地控制。站台的放的范围是10厘米。

  • 标签: 精密定位装置 压电电动机 设计 构造 微机械系统
  • 简介:Themainfocusisnonlinearmodel-baseddynamicpositioning(DP)controlsystemdesign.Anonlinearuniformglobalexponentialstability(UGES)observerproducesnoise-freeestimatesoftheposition,theslowlyvaryingenvironmentaldisturbancesandthevelocity,whichareusedinaproportional-derivative(PD)+feedforwardcontrollaw.Thestabilityofthisobserver-controllersystemisprovedbyintroducingaspecificnonlinearcascadedsystem.ThesimulationresultshavesuccessfullydemonstratedtheperformanceofdesignedDPcontrolsystem.

  • 标签: 非线性观测器 动力定位 前馈控制 稳定性分析 UGES 船舶
  • 简介:Ensuringahighmanufacturingtestqualityofanintegratedelectroniccircuitmandatestheapplicationofalargevolumetestset.Evenifthetestdatacanbefitintothememoryofanexternaltester,theconsequentincreaseintestapplicationtimereflectsintoelevatedproductioncosts.Testdatacompressionsolutionshavebeenproposedtoaddressthetesttimeanddatavolumeproblembystoringanddeliveringthetestdatainacompressedformat,andsubsequentlybyexpandingthedataon-chip.Inthispaper,weproposeascancellpositioningmethodologythataccompaniesacompressiontechniqueinordertoboostthecompressionratio,andsquashthetestdataevenfurther.Whilewepresenttheapplicationoftheproposedapproachinconjunctionwiththefan-outbaseddecompressionarchitecture,thisapproachcanbeextendedforapplicationalongwithothercompressionsolutionsaswell.Theexperimentalresultsalsoconfirmthecompressionenhancementoftheproposedmethodology.

  • 标签: 测试数据压缩 扫描单元 输出网络 细胞定位 外部存储器 测试应用
  • 简介:静态、运动学的testings被使用IGS5min,30年代和5s间隔调查在精确的点放的精确卫星钟产品(PPP)答案。测试结果证明IGS卫星钟的采样率在静态的PPP答案上有很小的效果。精确卫星钟的采样间隔的所有三种类型能满足放精确性的公里厘米水平;更高的采样率没为PPP答案有重要改进。然而,卫星钟的采样率在运动学的PPP在PPP答案上有重要影响。越高卫星钟的间隔,精确性完成了越多更好。运动学的PPP的精确性完成了由用30s间隔,精确卫星钟被使用精确卫星钟和30s间隔卫星钟能几乎生产的5min间隔被将近3050%关于答案改进运动学的答案的一样的精确性。而且,从不同分析中心的精确卫星钟产品的使用可以也差不多在PPP答案上生产效果。

  • 标签: 精密单点定位 定位卫星 时钟速率 IGS 抽样 运动测试
  • 简介:CombinedGPS/GLONASScanincreasetheaccuracyandreliabilityofpositioningespeciallyinsomeapplicationswithmanyimpediments.Duetotheatmospheredelay,thecommonlyusedmethodsforprocessingshortdistancebaselinescannotbeimplementedinlongdistancebaselines.Inthispaper,anewdataprocessingstrategyforlongdistancebaselinesisproposed,whichusesthepropertiesofsomecombinationobservablesofcombinedGPS/GLONASSanddistancebaselinesmaycometotheorderof10-8andcombinedGPS/GLONASSimprovestheaccuracyoverthatofGPS-onlypositioning,whichbringsbenefittocrustdeformationmonitoringandresearchongeodynamics.

  • 标签: combined GPS/GLONASS PRECISE POSITIONING AMBIGUITY
  • 简介:ThispaperpresentsadataprocessingstrategyforGPSkinematicpositioningbyusingaGPSactivenetworktomodeltheGPSerrorsindoubledifferenceobservable.Firstly,thedoubledifferenceresidualsareestimatedbetweenthereferencestationsintheactivenetwork.Thentheerrorsatauserstationarepredictedasthenetworkcorrectionstousermeasurements,basedonthelocationoftheuser.Finallyconventionalkinematicpositioningalgorithmscanbeappliedtodeterminethepositionoftheuserstation.Asanexample,continuous24-hourGPSdatainMarch2001hasbeenprocessedbythismethod.Itclearlydemonstratesthat,afterapplyingthesecorrectionstoauserwithinthenetwork,boththesuccessrateforambiguityresolutionandthepositioningaccuracyhavebeensignificantlyimproved.

  • 标签: 全球定位系统 GPS 运动学 活动网络 测量误差 模糊度
  • 简介:ThesynchrodoublepulsesignalmodeisfreuqentlyusedinShortBaseLine(SBL)underwaterpositioningsystemsoastoobtaintheinforma-tionofbothdistanceanddepthofatargetsimultaneously.Howerer,thissignalmodealsobringsaboutrangingindistinctnessresultinginashorterpositioningdistancemuchlessthanthatlimitedbytheperiodofthesynchrosignal.Thispaperpresentsahardwaredistance-gatedataacquiringscheme.Itputstheoriginaldatasenttothecomputerinorderof"directfirstpulse—depthinformationpulse(orfirstpulsereflectedbywatersurface)…"toguaranteetheeffectivepositioningdistanceofthesystem.Ithastheadvan-tageofreducingtheprocessingtimeofthecomputerthusensuringtherealtimefunctioningofthesystem.Afigureoftheorbitofanunderwatermovingtargetmeasuredinpracticeisattachedtotheendofthepaper.

  • 标签: positioning underwater reflected GUARANTEE FIGURE acquiring
  • 简介:一个建设性的方法被介绍为在波浪,风,和海洋水流导致的环境骚乱下面的表面轮船的动态放设计一个全球柔韧、适应的产量反馈控制器。轮船参数没被要求被知道。一个适应观察员首先被设计估计轮船速度和参数。轮船位置大小也被通过从进入控制系统减少高频率测量噪音的适应观察员。用这些估计信号,控制然后基于Lyapunovs直接方法被设计强迫轮船位置和取向到asymptotically全球性收敛到需要的值。模拟结果说明建议控制系统的有效性。在结论,纸论述了一个新方法为表面轮船的动态放设计一个有效控制系统。

  • 标签: 输出反馈控制器 鲁棒自适应 水面舰艇 动态定位 自适应观测器 控制设计
  • 简介:Vehicularnodepositioningneedstobequickandpreciseonhighwayforsafetyconsidera-tion.Inthispaper,wepresentanovelandpracticalvehicularnodepositioningmethodwhichcanachieveahigheraccuracyandmorereliabilitythantheexistingglobal-positioning-system-basedpo-sitioningsolutionsbymakinguseofDoppler-shiftedfrequencymeasurementstakenbyvehicularnodeitself.Thispositioningmethodusesinfrastructurenodeswhichareplacedontheroadsideeveryseveralkilometersasradiationsourcestoestimatetherelativedistancesofvehicletotheinfrastructurenode.Throughcoordinateconversion,wegettheabsolutecoordinatesofvehicularnodebasedonknownabsolutecoordinatesofinfrastructurenode.Wealsoanalyzetheoptimaldistanceofneighborinfra-structurenodesinordertoensureahighaccuracy.Inaddition,simulationresultsdemonstratethattheaccuracyofourmethodwithExtendedKalmanFiltering(EKF)issuperiortothemethodwithoutEKF.

  • 标签: 节点定位 多普勒频移 公路安全 扩展卡尔曼滤波 定位基 卡尔曼滤波方法