学科分类
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43 个结果
  • 简介:Asawhole,theEuropeanUnionhasyettocometoaclearconsensusonglobalization,manifestingakindofself-contradictingmentalityandconflictedpolicyorientations,evidencedbyitsdesiretoreapthebenefitsbroughtaboutbyglobalizationwhileatthesametimetryingtoevadechallenges.Forexample,theEUactivelyresistsUSprotectionism,whileclingingtoprotectionistmeasuresinitsownpolicies;anditsupportsthemechanismsforinternationalmultilateralcooperation,butatthetimeitwillfullyactstochangetherules.TheemergenceoftheEU'sconflictedattitudetowardglobalizationmaybeattributedtothefactthatithastoomanymemberstateswithawidedisparityintheireconomicperformancesinglobalization,whichhasmadeitdifficultforthemtoreachaconsensus.ItcanalsoberelatedtothecomplexityoftheEU'sinternaltradepolicyanddecision-makingmechanisms.Thismentalitywillaffectitsroleintheglobaleconomy,asitislikelythattheEUwillplaytherolesofreformerofthemechanismformultilateralcooperation,middlemanininternationaltradedisputes,andstragglerineconomicreforms.

  • 标签: the EU GLOBALIZATION PROTECTIONISM multilateral COOPERATION
  • 简介:ThestudypresentstheattitudetowardsmoneyamongadultMongolians.Theresearchfocusedondifferencesoftheattitudetowardsmoneyrelatedtoage,gender,andemploymentinMongolianpeople.TheaimofthisstudywastoexaminethedifferentiationoftheattitudetowardsmoneyofadultMongoliansrelatedtosatisfactionwithlife,thesenseofsecurity,andtheroleofsocio-demographicalparameters,suchasage,gender,andemployment.People’sattitudestowardsmoneyseemtobeacquiredthrougheducation,professionalexperience,andmonetaryhabits.Peopleperceivedmoneyasasymbolofasenseofsecurity,amarkerofachievementorstatus,andthesourceofworryoranxiety.Researchersnotedthatmoneyhasamulti-dimensionalpsychologicalmeaning.TheresearchsampleconsistedofMongolianpeople:Agroupof300Mongolians.Theageofparticipantsvariedfrom21to60yearsold.StatisticalVersion10.0wasusedtoanalyzethedata.Theresultsshowedthattheattitudetowardsmoneydependsonthesatisfactionwithlife,thesenseofsecurity,andweredifferentbygenderandemployment.Mongolianshavestrongtendenciestousemoneyasasymbolofpowerandstatus.However,thistendencyisstrongerinthegroupofmenincomparisontowomen,inthisculture.Retention-Timewasbiggerdifferentiatedbyvariableemployment.Accordingtotheresults,therewasnosignificantdifferenceinage.Furthermore,therewerenegativeassociationbetweensatisfactionwithlifeanddistrustinthegroup.Theywhohavefinancialworryseemtobelesssatisfiedwiththeirlife.ThemostnumberofpeopleinMongoliansampleevaluatedownincomeasaverage.Thepercentagesofpersonalprofessionalactivitywerethehighestthananothercategoryinthegroup.Theresultsofstatisticalanalysisshowedthatdifferencesoffrequenciesofsomecomponentsofeconomicsecurityweresignificantinthesample.Insum,ourstudywillcontributetoknowledgeabouttheimportanceofgenerallifesatisfactionandfeelingsecurityontheattitudetowardmoney.The

  • 标签: ATTITUDE TOWARDS MONEY age gender and
  • 简介:Itisanimportantcontrolprocesstooperatemotionofansubmergencerescuevehicle(SRV).Seeingthatthemotionofthesubmergencerescuevehicleisspecial,itisnecessarytoemploynon-linearpredictivecontrolsystem.Forthisreason,continuousdynamicperformanceofthesystem,thelogicalcomponentsandtheoperativerestraintsareexpressedasthenon-linearequationsofstatewiththeinequalityrestraints,andthemodelprincipleofhybridsystemisintroduced.TheconclusionshowsthatitcomestruetoexactlycontrolpositionandattitudeoftheSRVbymeansofnon-linearmodelpredictivecontrol.Thetestinamodelbasinhasalsoprovedthattheabovemethodsareefficient.

  • 标签: 深潜救援器 测站 姿态控制 凸轮 锁紧尾栓 弹药筒退壳器
  • 简介:三个最佳的线性态度评估者用一条几何途径为太空船态度的单个点的即时评价被建议。最后的最佳的态度被修改Rodrigues参数(MRP)代表。在为每测量价值介绍偶然的右边的直角的坐标以后,三错误向量被点或/并且生气产品的使用获得。相应optimality标准严厉地二次、非强迫,它不与Wahbas与抑制标准一致。奇特,当主要角度接近时,发生,能被一合适的旋转容易避免。数字模拟证明建议三个最佳的线性评估者能提供与遵循Wahbaoptimality定义的那些可比较的精确,并且比著名四元数评估者(探索)有更快的计算速度。

  • 标签: 线性态度决心 几何分析 吉布斯向量 奇特回避
  • 简介:Theobjectiveofthispaperistodevelopaneuralnetwork-basedresidualgeneratortodetectthefaultintheactuatorsforaspecificcommunicationsatelliteinitsattitudecontrolsystem(ACS).First,adynamicmultilayerperceptronnetworkwithdynamicneuronsisused,theseneuronscorrespondtoasecondorderlinearInfiniteImpulseResponse(IIR)filterandanonlinearactivationfunctionwithadjustableparameters.Second,theparametersfromthenetworkareadjustedtominimizeaperformanceindexspecifiedbytheoutputestimatederror,withthegiveninput-outputdatacollectedfromthespecificACS.Then,theproposeddynamicneuralnetworkistrainedandappliedfordetectingthefaultsinjectedtothewheel,whichisthemainactuatorinthenormalmodeforthecommunicationsatellite.Thentheperformanceandcapabilitiesoftheproposednetworkweretestedandcomparedwithaconventionalmodel-basedobserverresidual,showingthedifferencesbetweenthesetwomethods,andindicatingthebenefitoftheproposedalgorithmtoknowtherealstatusofthemomentumwheel.Finally,theapplicationofthemethodsinasatellitegroundstationisdiscussed.

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  • 简介:Inremotesensingorlasercommunicationspacemissions,spacecraftneedfastmaneuverandfaststabilizationinordertoaccomplishagileimagingandattitudetrackingtasks.However,fastattitudemaneuverscaneasilycauseelasticdeformationsandvibrationsinflexibleappendagesofthespacecraft.Thispaperfocusesonthisproblemanddealswiththecombinedcontroloffastattitudemaneuverandstabilizationforlargecomplexspacecraft.Themathematicalmodelofcomplexspacecraftwithflexibleappendagesandmomentumbiasactuatorsonboardispresented.Basedontheplantmodelandcombinedwiththefeedbackcontroller,modalparametersoftheclosed-loopsystemarecalculated,andamultiplemodeinputshaperutilizingthemodalinformationisdesignedtosuppressvibrations.Aimingatreducingvibrationsexcitedbyattitudemaneuver,aquinticpolynomialformrotationpathplanningisproposedwithconstraintsontheactuatorsandtheangularvelocitytakenintoaccount.Attitudemaneuversimulationresultsofthecontrolsystemswithinputshaperorpathplanninginloopareseparatelyanalyzed,andbasedontheanalysis,acombinedcontrolstrategyispresentedwithbothpathplanningandinputshaperinloop.Simulationresultsshowthatthecombinedcontrolstrategysatisfiesthecomplexspacecraft’srequirementoffastmaneuverandstabilizationwiththeactuators’torquelimitationsatisfiedatthesametime.

  • 标签: 姿态机动 航天器 稳定 控制相 复合控制策略 路径规划
  • 简介:以便快认识到与高分辨率调遣目标区域的成像活泼的卫星,匹配算法的新态度被开发。光线踪迹和印射的速度向量的一个严格的马赛克成像模型根据在成像目标和照相机之间的长带马赛克成像原则和关系被造焦点的飞机。三轴的态度基于调遣的路径的最佳的追踪的原则被推出。最后,几何可伸缩模拟整个推迟的时间和集成(TDI)充电被执行联合设备(电荷耦合器件)原型系统,卫星态度控制物理模拟站台和带的地球目标模拟器。试验性的结果证明算法能认识到匹配的乐队目标的无缝的拼接成像很好,证实算法的正确性。

  • 标签: 卫星姿态控制 姿态算法 成像目标 无缝拼接 波段 电荷耦合器件
  • 简介:Toensurethesuccessofthee-learninginitiatives,OUMhasdevelopeditsowne-learningmanagementsystem,knownasmyLMS.Sinceitsintroduction,manymodificationsandimprovementshavebeenintroducedtoincreaseitseffectiveness.ItisnowtimelythatOUMtakestockofitsstudents'attitudestowardse-learning.Thus,asurveywasconductedonabout1,000studentsatoneofOUM'sownlearningcentres,thatis,theKelantanRegionalCentrel.Thestudyindicatedthatgenerallytheteachercohorthadasomewhatneutralattitudetowardse-learning.Theuseofe-learningwasmorespecificallyaimedatachievingshorttermgoalsofobtaininggoodcourseworkandexaminationgradesbycapitalizingontheuseoftheDiscussionBoardandCourseware.AcloserexaminationrevealsthatthefemalesprefertheDiscussionBoardwhilethemalesprefertheCourseware.LearnersintheEngineeringandEnglishprogrammeshadmorepositiveattitudestowardse-learningcomparedtolearnersintheMathematicsandScienceprogramme.LearnerswithCGPA>3.0whoarecategorizedashighachieversaremorepositivetowardse-learningascomparedtothelowachievers(CGPA<3.0).Agedifference,learners‘incomepermonth,learners’Internetande-learninghabitswerealsofoundtobepredictorsofattitudetowardse-learning.

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  • 简介:基于排斥粒子,过滤器(MPF)被交上的一个算法在这篇论文详细说明解决太空船态度评价问题:用偏导的旋转罗盘和向量观察的态度和旋转罗盘偏爱评价。在这个算法,由外面排斥在太空船模型的线性地的州的出现,Kalman过滤器与每个粒子被联系以便减少州的空间和计算负担的尺寸。态度向量的分发被一套粒子接近并且估计了使用粒子过滤器,当旋转罗盘偏爱的评价被使用Kalman过滤器为一个态度粒子获得时。这个修改MPF评估者的效率通过充分激活的僵硬身体的数字模拟被验证。为比较,unscentedKalman过滤器(UKF)也被用来计量MPF的表演。在这份报纸介绍的结果清楚地证明MPF比在应付非线性的模型的UKF优异。关键词态度评价-粒子过滤器-太空船-非线性的过滤器-四元数这个工作被研究资金支持因为中国(号码20050213010)的高等教育的博士程序,国家高技术研究和开发中国(863程序)(号码2004AA735080)编程序。刘亚秋加入了信息的学院,东北林地大学,哈尔滨,中国自从2004,他当前在哪儿副教授。他收到了B.Eng的度。(电力工程)电的Technolog从哈尔滨开创M.Eng。(控制理论和工程)从从在1990,1999和2004的哈尔滨工学院的东北林地大学和博士(航行,指导和控制)分别地。他的研究兴趣包括进程控制,聪明的控制和软计算,差错诊断。是的江学元论文的一个相应作者,收到了B.Eng的学位。(自动控制),M.Eng。(控制理论和工程)并且从在2000,2002和2006的哈尔滨工学院的博士(航行,指导和控制)分别地。他的主要研究兴趣在太空船态度控制,态度评价,和非线性的过滤器。马光富是在学院航天学的一个完整的教授,哈尔滨工学院,哈尔滨,中国,自从1997。他收到了B.Eng的学位。(自动控制),M.Eng。(控制理论和申请)并且�

  • 标签: 太空船 姿态估计 矢量测量 边缘化粒子滤波器