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432 个结果
  • 简介:Thebacktrackingsearchoptimizationalgorithm(BSA)isoneofthemostrecentlyproposedpopulation-basedevolutionaryalgorithmsforglobaloptimization.Duetoitsmemoryabilityandsimplestructure,BSAhaspowerfulcapabilitytofindglobaloptimalsolutions.However,thealgorithmisstillinsufficientinbalancingtheexplorationandtheexploitation.Therefore,animprovedadaptivebacktrackingsearchoptimizationalgorithmcombinedwithmodifiedHooke-Jeevespatternsearchisproposedfornumericalglobaloptimization.Ithastwomainparts:theBSAisusedfortheexplorationphaseandthemodifiedpatternsearchmethodcompletestheexploitationphase.Inparticular,asimplebuteffectivestrategyofadaptingoneofBSA’simportantcontrolparametersisintroduced.TheproposedalgorithmiscomparedwithstandardBSA,threestate-of-the-artevolutionaryalgorithmsandthreesuperioralgorithmsinIEEECongressonEvolutionaryComputation2014(IEEECEC2014)oversixwidely-usedbenchmarksand22real-parametersingleobjectivenumericaloptimizationbenchmarksinIEEECEC2014.Theresultsofexperimentandstatisticalanalysisdemonstratetheeffectivenessandefficiencyoftheproposedalgorithm.

  • 标签: 优化算法 回溯搜索 自适应 模式搜索法 IEEE 全局优化
  • 简介:WepresentthefirststepsofadesignoftheoptimalparametersforafullBraggX-Rayfreeelectronlaser(BX-FEL).AimingtowardsafuturesourceofcoherentX-rayradiation,operatinginthestrongComptonregime,weenvisagethesystemtobetheseedforanadvancedlightsourceorcompactmedicalX-raysource.Herewefocusonthedesignoftheacceleratorparameters:maximumgradient,optimalacceleratedcharge,maximumefficiency,and‘wakecoefficient’,whichrelatestothedeceleratingelectricfieldgeneratedduetothemotionofacharged-lineortrainofcharged-lines.Specifically,wedemonstratethatthemaximumefficiencyhasoptimalvalueandgiventhefluenceofthematerials,themaximumacceleratedchargeinthetrainisconstant.Thesetworesultsmightbeimportantinanyfuturedesign.

  • 标签: BRAGG wake-field COMPTON SCATTERING energy CONVERSION
  • 简介:Anoveloptimizationalgorithmcalledstochasticfocusingsearch(SFS)forthereal-parameteroptimizationisproposed.Thenewalgorithmisaswarmintelligencealgorithm,whichisbasedonsimulatingtheactofhumanrandomizedsearching,andthehumansearchingbehaviors.Thealgorithm'sperformanceisstudiedusingachallengingsetoftypicallycomplexfunctionswithcomparisonofdifferentialevolution(DE)andthreemodifiedparticleswarmoptimization(PSO)algorithms,andthesimulationresultsshowthatSFSiscompetitivetosolvemostpartsofthebenchmarkproblemsandwillbecomeapromisingcandidateofsearchalgorithmsespeciallywhentheexistingalgorithmshavesomedifficultiesinsolvingcertainproblems.

  • 标签: 参数系统 系统工程 系统分析 系统理论 SFS
  • 简介:由于他们的结构上的二金属的nanoparticles(NP)的化学、物理的性质的依赖,他们的结构的特征的基本理解为他们的综合体和宽应用是关键的。在这篇文章,Au-Pd二金属的NP的系统的原子水平的调查被在不同Au/Pd比率和不同尺寸与量修正Sutton陈潜力(Q-SC)使用改进粒子群优化(IPSO)进行。在IPSO,模仿的退火被介绍进古典粒子群优化(PSO)改进有效性和可靠性。另外,结构的稳定性和结构的特征上的起始的结构,粒子尺寸和作文的影响也被学习。模拟结果表明起始的结构在稳定的结构上有小效果,但是极大地影响收敛的率,并且起始的结构清楚地是的混合的集中率快核心壳和阶段比那些组织。我们发现Au-PdNP比较喜欢结构与在外部层Au富有当时在内部的Pd富有。特别,当Au/Pd比率是6:4时,nanoparticle(NP)的结构介绍标准化Pd核心Au壳结构。

  • 标签:
  • 简介:由Synechcoccus在Ni的简历累积上影响因素在这篇论文被学习。当到干燥重量集中ofSynechcoccus的Ni的集体比率是16-18%时,简历累积在附近是在水的solution.Bioaccumulation数量的80min的Ni的使平衡时间到达了最大值。Bioaccumulation数量与增加pH增加了。最佳pHwas9-10和更高的pH导致了Ni的降水(哦)_2。Bioaccumulation数量被在35℃到达他们的optima的温度和轻紧张也影响,无生命的水藻的3000Ixrespectively.Bioaccumulation比生活水藻的大。

  • 标签: 生物积累 矿山排水污染 环境保护
  • 简介:Thispaperintroducedcharacteristicsofrefractoriesandstepofsimulation.Duringsimulation,firstlyanalyzedmechanismoftechnology;secondlydescribedthemechanismasquadraticequation;thirdlydesignedandexecutedexperiment;latermaderegressionequationandoptimization;thenfoundtechnicalconflict;finallyanalyzedandresolvedtheconflict.Doingrepeatedlylikethis,resolveddifficultproblems.

  • 标签: 耐火材料 优化 综述 建模 仿真过程 技术冲突
  • 简介:在为轮船主人的一个机载的决定支持/指导系统的框架的线路优化方法论在这份报纸被开发了并且被介绍。方法瞄准与经得起海上风浪的性能期望在航行持续时间的可接受的限制以内的轮船有关的燃料航行费用和风险的最小化。这方法论的部分被连接其他的概率评价方法实现,例如蒙特卡罗,第一个顺序可靠性方法(形式)和秒顺序可靠性方法(SORM),和3-D经得起海上风浪的代码,包括为在NTUA-SDL的波浪的增加的抵抗的计算的一个软件工具。全部系统在概率的分析软件PROBAN以内是综合的。为为关于预定义的阀值价值的exceedance层次的考虑经得起海上风浪的危险的增加的抵抗和概率的评价的计算的二个主要模块此处被详细描述,鉴于他们的实现,确认研究证明了他们的效率进一个机载的优化系统。

  • 标签: 路由优化 不确定性 一阶可靠性方法 二阶可靠性方法 耐波性能 概率分析
  • 简介:Inthispaperwepresentanextensionofthetopologyoptimizationmethodtoincludeuncertaintiesdur-ingthefabricationofmacro,microandnanostructures.Morespecifically,weconsiderdevicesthataremanufacturedusingprocesseswhichmayresultin(uniformly)toothin(eroded)ortoothick(dilated)structurescomparedtotheintendedtopology.ExamplesareMEMSdevicesmanufacturedusingetchingprocesses,nano-devicesmanufacturedusinge-beamlithographyorlasermicro-machiningandmacrostructuresmanufacturedusingmillingprocesses.Inthesuggestedrobusttopologyoptimizationapproach,under-andover-etchingismodelledbyimageprocessing-based'erode'and'dilate'operatorsandtheoptimizationproblemisfor-mulatedasaworstcasedesignproblem.Applicationsofthemethodtothedesignofmacrostructuresforminimumcomplianceandmicrocompliantmechanismsshowthatthemethodprovidesmanufacturingtolerantdesignswithlittledecreaseinperformance.Asapositivesideeffecttherobustdesignformulationalsoeliminatesthelongstandingprob-lemofone-nodeconnectedhingesincompliantmechanismdesignusingtopologyoptimization.

  • 标签: 拓扑优化设计 制造过程 容错 MEMS器件 宏观结构 蚀刻工艺
  • 简介:Asystematic,efficientcompilationmethodforqueryevaluationofDeductiveDatabases(DeDB)isproposedinthispaper.Inordertoeliminateredundancyandtominimizethepotentiallyrelevantfacts,whicharetwokeyissuestotheefficiencyofaDeDB,thecompilationprocessisdecomposedintotwophases.Thefirstisthepre-compilationphase,whichisresponsiblefortheminimizationofthepotentiallyrelevantfacts.Thesecond,whichwerefertoasthegeneralcompilationphase,isresponsiblefortheeliminationofredundancy.Therule/goalgraphdevisedbyJ.D.Ullmanisappropriatelyextendedandusedasauniformformalism.Twogeneralalgorithmscorrespondingtothetwophasesrespectivelyaredescribedintuitivelyandformally.

  • 标签: 演绎数据库 咨询优化 知识集成
  • 简介:Inthispaper,LCPisconvertedtoanequivalentnonsmoothnonlinearequationsystemH(x,y)=0byusingthefamousNCPfunction-Fischer-Burmeisterfunction.NotethatsomeequationsinH(x,y)=0arenonsmoothandnonlinearhencedifficulttosolvewhiletheothersarelinearhenceeasytosolve.ThenwefurtherconvertthenonlinearequationsystemH(x,y)=0toanoptimizationproblemwithlinearequalityconstraints.AfterthatwestudytheconditionsunderwhichtheK-TpointsoftheoptimizationproblemarethesolutionsoftheoriginalLCPandproposeamethodtosolvetheoptimizationproblem.Inthisalgorithm,thesearchdirectionisobtainedbysolvingastrictconvexprogrammingateachiterativepoint,However,ouralgorithmisessentiallydifferentfromtraditionalSQPmethod.Theglobalconvergenceofthemethodisprovedundermildconditions.Inaddition,wecanprovethatthealgorithmisconvergentsuperlinearlyundertheconditions:MisP0matrixandthelimitpointisastrictcomplementaritysolutionofLCP.Preliminarynumericalexperimentsarereportedwiththismethod.

  • 标签: 最优化 非线性方程 函数 数值逼近
  • 简介:Inthispaper,weproposeanewartificialantalgorithmforsolvingconstrainedoptimizationproblemsingeneralcase.Numericalexamplesshowthatitiseffectiveandrobust.

  • 标签: ANT ALGORITHM CONSTRAINED OPTIMIZATION
  • 简介:Thebuyer-supplierrelationshipplaysagreatroleinmosteconomicsystems.Thebuyingfirmusuallytriestofindanewsupplierwhoprovidesproductswithsatisfyingqualityandlowerprice.Abroadbranchofliteraturedealswiththedevelopmentofbuyer-supplierrelationships,butlimitedresearchisonthecircumstancesunderwhichabuyershouldterminatesucharelationshipandswitchtoanewsupplier.Inthispaper,theincentivecompatibilityconstraint(IC)whichinducestheentrantsuppliertoreporthistruecostisconsidered,andtheparticipationconstraint(PC)whichensurestheentrantsuppliertogetatleastreservationprofitistakenintoaccount.Thenthesupplierswitchingmodelissetuptominimizethebuyingfirm’stotalprocurementcostwhichincludesthetransferpaymenttotheincumbentsupplier,thepaymenttotheentrantsupplierandtheswitchingcost,andthebuyingfirm’sswitchingcostisconsideredasafunctionoftheswitchingquantity.WiththetheoreticalanalysisofIC,PCandtheproposedmodel,theoptimalsupplierswitchingstrategycanbeobtained.Finally,anumericalexampleisgiventoillustratetheeffectivenessoftheproposedmodelandtheswitchingstrategy.

  • 标签: 供应商 开关量 信息不对称 采购成本 优化 切换策略
  • 简介:Inordertosolvetheconstrainedglobaloptimizationproblem,weusepenaltyfunctionsnotonlyonconstraintsbutalsoonobjectivefunction.Thenwithintheframeworkofintervalanalysis,anintervalBranch-and-Boundalgorithmisgiven,whichdoesnotneedtosolveasequenceofunconstrainedproblems.Globalconvergenceisproved.Numericalexamplesshowthatthisalgorithmisefficient.

  • 标签: CONSTRAINED golbal OPTIMIZATION INTERVAL analysis penally
  • 简介:多重数据(SIMD)指令经常是的单个说明在现代媒介处理器实现了。尽管SIMD指令在多媒体应用程序是有用的,大多数编译器没为SIMD指令有好支持。这篇论文为媒介处理器集中于SIMD指令产生。我们在场集成于一个retargetableC编译器的一条有效代码优化途径。SIMD指令被发现产生;在程序联合一样的操作。UltraSPARC力指令集的试验性的结果证明直到2.639的一个加速因素被获得。

  • 标签: 计算机软件 编译程序 单指令多倍数据 处理器
  • 简介:Inthispapertheeffectsofthecondenserdesignparameters(suchasturbineinletcondition.turbinepowerandcondenserpressure)onheattransferarea,coolingwaterflow-rate.condensercostandspecificenergygenerationcostarestudiedforsurfacetypecondenser.Theresultsaregiveninthetextandalsoshownasdiagrams.

  • 标签: 冷凝器 能量消耗 最优化 蒸汽轮机 蒸汽动力装置
  • 简介:Globalstrengthisasignificantitemforfloatingproductionstorageandoffloading(FPSO)design,andsteelweightplaysanimportantroleinthebuildingcostsofFPSO.Itisthemaintasktoconsiderandcombinethesetwoaspectsbyoptimizinghulldimensions.Therearemanyoptionalmethodsfortheglobalstrengthanalysis.AcommonmethodistousetheABSFPSOEaglesoftwaretoanalyzetheglobalstrengthincludingtherulecheckanddirectstrengthanalysis.AndthesamemethodcanbeadoptedfortheFPSOhulloptimizationbychangingthedepth.Aftercalculationandoptimization,theresultsarecomparedandanalyzed.Theresultscanbeusedasareferenceforthefuturedesignorquotationpurpose.

  • 标签: global STRENGTH HULL optimization FPSO steel