学科分类
/ 6
119 个结果
  • 简介:Liquor-makingindustryhassteppedintothedepthsstrategictransformationandfacedmorecomplexandversatilemacrosituationinrecentyears,whichmeansthateconomyintegrationwasaccelerated,thespreadofinformationtechnologyspedup,consumerdemandforproductsbecamecomplexandsophisticated,andproductlifecyclewasshortened.Thetheoryof'Internet+'highlightsnewturninthestrategictransformationofliquor-makingindustry.Thispaper,underthebackgroundof'Internet+',analyzestheexistingsituationsofliquor-makingindustry,providestransitionroutesofstrategictransformationinliquor-makingindustry,andgivespreventionagainsttransformationrisks.

  • 标签:
  • 简介:SustainableeconomicrecoveryintheU.S.hascreatedafavorableenvironmentfortheFederalReserve(Fed)’staperingpolicy,butthisoperationfacesmanydifferenttypesofrisk.ChinashouldseizethecurrentopportunitywhiletheFedtapersoperationstocarveoutcountermeasuresinordertowithstandeconomicriskandenhanceitscapacitytowardofffinancialshock.

  • 标签: 中国经济 量化 风险 房地产市场 美国联邦
  • 简介:

  • 标签:
  • 简介:Heuristicisanimportantmethodtosolvetheshortestpathproblems.Itindicatesliterallylearningbyexperience,ormoregenerallyintheartificialintelligenceliterature,aheuristicisa“ruleofthumb”andassuchistheapproachusedbyalmostanyhumaninconductingasearch[1]。Inthecontextofcomputersearchalgorithms,heuristicimpliessimplesearchthroughspecificknowledge.Un_deraspecialfunction,ateverystepthesealg_orithmssearchthenodewithhighestscoreasthenextnodetobeextended.Themajoreffectofheuristicsearchisthatinsomewayitconstrainsthesearchspace.Theshortestpathalgorithmsbasedonheuristicincludescostingalgorithm[1],branch_and_boundalgorithm[2,3],greedyalgorithms[4~11],hill_climbingalgorithms[1~3],andA*algorithm[12~14],etc.  Amongtheknownshortestpathalgorithms,manyofthemusethegreedystrategiesasthesearchstrategiesandexplorehowtodesigndelicaterunningdatastructuresandsearchingalgorithms,soastoimprovetherunningefficiencyofsequentialshortestpathalgorithmsundertheuniformtimecomplexity.Forthetwobranchesoflosslessshortestpathalgorithms:labelsettingandlabelcorrectingalgorithms,expertshavesetforwardvariousrunningdatastructuresandrelatedliteraturesemergeendlessly.Refs.[15~19]havemadedetailedanalysisandcomparisonfortheshortestpathalgorithmspresentedbefore.Becausetherealnetworks,suchastransportationnetworks,telecommunicationnetworks,facilitynetworksandhydrographicnetworksdonotconcernnegativeweights,afamouslabelsettingalgorithmadoptinggreedystrategy,namelyDijkstra'salgorithm,hasattractedwideattentionandgotwidedisseminationandapplications.Dijkstra'salgorithmisthemostmatureshortestpathalgorithmtheoreticallyuptodate[8,16,20]andhasbecomethecrucialalgorithmforthenetworkanalysismodulesofmanylargeGISplatforms.Differentimplementationmethodshaveformedalargefami

  • 标签: OPTIMUM PATH algorithm TRAFFIC NETWORK HIERARCHICAL
  • 简介:无线传感器网络广泛地正在被研究并且被期望在几种情形被过去常。在前缘上踩,按需、高可靠性、低潜伏的路由协议为室内的环境应用程序是合乎需要的。这篇文章建议一个路由计划把柔韧的多路径称为建立并且使用多重节点拆散线路的路由。提供多重线路帮助减少线路恢复进程并且控制消息开销。有由OPNET模拟的动态来源路由(数据设置就绪)的这个协议的表演比较证明这个协议能在包交货比率和平均端对端的延期完成显著改进。

  • 标签: 无线传感器网络 动力学拓扑 多路径路由 鲁棒性 可靠性
  • 简介:我们在这份报纸在场计划方法的一条柔韧的联机路径,它在否认GPS、撒布障碍的环境安全地允许一只微旋转飞机雄蜂到苍蝇与限制了机载的计算力量。途径基于到二个点边界价值问题(TPBVP)的一张高效地管理的格子地图和一个靠近形式的答案。而TPBVP的答案产生光滑的轨道,格子地图帮助轨道评估。最后,交换算法的一条最高层的轨道被利用最小化计算费用。建议途径的优点包括它计算资源的保存,轨道产生的坚韧性和对未知环境的反应的活泼。结果在实际雄蜂平台上被认识到并且成功地在真实飞行测试示威了。飞行测试的录像能被发现在:http://uav.ece.nus.edu.sg/robust-online-path-planning-Lai2015.html。

  • 标签: 无人机平台 路径规划 环境 在线 两点边值问题 旋翼
  • 简介:Amorerelaxedsufficientconditionfortheconvergenceoffiltered-XLMS(FXLMS)algorithmispresented.Itispointedoutthatifsomepositiverealconditionforsecondarypathtransferfunctionanditsestimatesissatisfiedwithinallthefrequencybands,FXLMSalgorithmconvergeswhateverthereferencesignalislike.Butiftheabovepositiverealconditionissatisfiedonlywithinsomefrequencybands,theconvergenceofFXLMSalgorithmisdependentonthedistributionofpowerspectraldensityofthereferencesignal,andtheconvergencestepsizeisdeterminedbythedistributionofsomespecificcorrelationmatrixeigenvalues.ApplyingtheconclusionabovetotheDelayedLMS(DLMS)algorithm,itisshownthatDLMSalgorithmwithsomeerroroftimedelayestimationconvergesincertaindiscretefrequencybands,andthewidthofwhicharedeterminedonlybythe"time-delayestimationerrorfrequency"whichisequaltoonefourthoftheinverseofestimatederrorofthetimedelay.

  • 标签:
  • 简介:

  • 标签:
  • 简介:ABRANCH-AND-BOUNDALGORITHMINTHETOURING-PATHPROBLEMANDITSCOMPUTERIMPLEMENTATIONXuXusong(徐绪松)(SchoolofManagement,WuhanUniversit...

  • 标签: ALGOR
  • 简介:Inthispaper,arobustpathfollowingcontrollawisproposedforadeep-seamannedsubmersiblemaneuveringalongapredeterminatedpath.DevelopedinChina,thesubmersibleisunderactuatedinthehorizontalplaneinthatitisactuatedbytwoperpendicularthrustsinthisplane.Theadvancednon-singularterminalslidingmode(NTSM)isimplementedforthedesignofthepathfollowingcontroller,whichcanensuretheconvergenceofthemotionsysteminfinitetimeandimproveitsrobustnessagainstparametricuncertaintiesandenvironmentaldisturbances.Intheprocessofcontrollerdesign,theclose-loopstabilityisconsideredandprovedbyLyapunov'sstabilitytheory.Withtheexperimentaldata,numericalsimulationsareprovidedtoverifythecontrollawforpathfollowingofthedeep-seamannedsubmersible.

  • 标签: 终端滑动模型 鲁棒性 潜水器 路径控制 潜水技术
  • 简介:Apathfollowingcontrollerisdevelopedforunderactuatedshipswithonlysurgeforceandyawmomentavailabletofollowapredefinedpath.Theproposedcontrollerisbasedonnonswitchanalyticmodelpredictivecontrol.Itisshownthattheoptimalcontrollawforanonlinearpathfollowingsystemwithill-definedrelativedegreeiscontinuousandnonsingular.Theproblemofill-definedrelativedegreeissolved.Thepath-followingabilityofthenonlinearsystemisguaranteed.Numericalsimulationsareprovidedtodemonstratetheeffectivenessoftheproposedcontrollaw.

  • 标签: 路径跟踪控制 模型预测控制 控制驱动 船舶 开关 非线性系统