简介:Liquor-makingindustryhassteppedintothedepthsstrategictransformationandfacedmorecomplexandversatilemacrosituationinrecentyears,whichmeansthateconomyintegrationwasaccelerated,thespreadofinformationtechnologyspedup,consumerdemandforproductsbecamecomplexandsophisticated,andproductlifecyclewasshortened.Thetheoryof'Internet+'highlightsnewturninthestrategictransformationofliquor-makingindustry.Thispaper,underthebackgroundof'Internet+',analyzestheexistingsituationsofliquor-makingindustry,providestransitionroutesofstrategictransformationinliquor-makingindustry,andgivespreventionagainsttransformationrisks.
简介:SustainableeconomicrecoveryintheU.S.hascreatedafavorableenvironmentfortheFederalReserve(Fed)’staperingpolicy,butthisoperationfacesmanydifferenttypesofrisk.ChinashouldseizethecurrentopportunitywhiletheFedtapersoperationstocarveoutcountermeasuresinordertowithstandeconomicriskandenhanceitscapacitytowardofffinancialshock.
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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
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。
简介:Amorerelaxedsufficientconditionfortheconvergenceoffiltered-XLMS(FXLMS)algorithmispresented.Itispointedoutthatifsomepositiverealconditionforsecondarypathtransferfunctionanditsestimatesissatisfiedwithinallthefrequencybands,FXLMSalgorithmconvergeswhateverthereferencesignalislike.Butiftheabovepositiverealconditionissatisfiedonlywithinsomefrequencybands,theconvergenceofFXLMSalgorithmisdependentonthedistributionofpowerspectraldensityofthereferencesignal,andtheconvergencestepsizeisdeterminedbythedistributionofsomespecificcorrelationmatrixeigenvalues.ApplyingtheconclusionabovetotheDelayedLMS(DLMS)algorithm,itisshownthatDLMSalgorithmwithsomeerroroftimedelayestimationconvergesincertaindiscretefrequencybands,andthewidthofwhicharedeterminedonlybythe"time-delayestimationerrorfrequency"whichisequaltoonefourthoftheinverseofestimatederrorofthetimedelay.
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简介:ABRANCH-AND-BOUNDALGORITHMINTHETOURING-PATHPROBLEMANDITSCOMPUTERIMPLEMENTATIONXuXusong(徐绪松)(SchoolofManagement,WuhanUniversit...
简介:Inthispaper,arobustpathfollowingcontrollawisproposedforadeep-seamannedsubmersiblemaneuveringalongapredeterminatedpath.DevelopedinChina,thesubmersibleisunderactuatedinthehorizontalplaneinthatitisactuatedbytwoperpendicularthrustsinthisplane.Theadvancednon-singularterminalslidingmode(NTSM)isimplementedforthedesignofthepathfollowingcontroller,whichcanensuretheconvergenceofthemotionsysteminfinitetimeandimproveitsrobustnessagainstparametricuncertaintiesandenvironmentaldisturbances.Intheprocessofcontrollerdesign,theclose-loopstabilityisconsideredandprovedbyLyapunov'sstabilitytheory.Withtheexperimentaldata,numericalsimulationsareprovidedtoverifythecontrollawforpathfollowingofthedeep-seamannedsubmersible.
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简介:Apathfollowingcontrollerisdevelopedforunderactuatedshipswithonlysurgeforceandyawmomentavailabletofollowapredefinedpath.Theproposedcontrollerisbasedonnonswitchanalyticmodelpredictivecontrol.Itisshownthattheoptimalcontrollawforanonlinearpathfollowingsystemwithill-definedrelativedegreeiscontinuousandnonsingular.Theproblemofill-definedrelativedegreeissolved.Thepath-followingabilityofthenonlinearsystemisguaranteed.Numericalsimulationsareprovidedtodemonstratetheeffectivenessoftheproposedcontrollaw.