学科分类
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433 个结果
  • 简介:Theoptimizationpolicyofthepurchasepriceandtheprofitundervendormanagedinventory(VMI)isstudied.Forasalableproduct,supplychainmodeofVMIisestablished,whichisbasedondeterministicdemand,havinginitialstockandhavingstock-outcost.Withthefurtheranalysisofthemode,VMIisfoundtoincreaseprofitsofthebuyerintheshort-termmotivation.ButVMIwillreduceprofitsofthesupplierunderthematchingcondition.Andintheshorttermmotivation,VMIwillincreasethepurchasepricetocompensatethetransfercostofthesupplier.Asaresult,thefoundationoftheoryisprovidedtoimplementVMIinthesupplychain,andhavesomedefinitudedprojectsignificance.

  • 标签: 供应链 库存控制 购买价格 利润
  • 简介:Thispaperpresentsatrustregionalgorithmwithnullspacetechniquefornonlinearequalityconstrainedoptimization.Consideringinthenullspacemethodsthat,theconvergentrateofrangespacestepisfasterthanthenullspacestepforthemostcases,theproposedalgorithmcomputesnullstepsmoreoftenthanrangespacestep.Moreover,thenewalgorithmisbasedonthereducedHessianSQPmethod.Globalconvergenceoftheproposedalgorithmisproved.Theeffectivenessofthemethodisdemonstratedbysomenumericalexamples.

  • 标签: 置信域 零空间 约束最优化 非线性等式 全局收敛性
  • 简介:Furnaceareaisregardedaslooperbetweencastingandhotrolling,whichisveryimportantformaterialflowbalanceandproductionorganizationaswellastemperatureregulationetc.Inparticular,whendealingwithenergysavingandemissionreductionandheatingqualityimproving,pre_heatingfurnaceispaidmoreattention.Theradicaltargetforpreheatingfurnaceistotransferheatingenergyattheleastcost.Asweknow,thepreheatingfurnaceisadissipationsystemtoobeyconservationofenergylaw,thatistosaythatinputenergyalwaysequalstooutputenergy,inthemeantime,thewholeenergyconsumingisnotreversible.Thereforeincreasingtheefficiencyofusingenergyisuppermost.Inthispaper,heatingtransferefficiencyisanalysedandmathematicalexpressionisgivenbasedonconservationofenergylaw.Typicaloptimalmethodstoimprovepreheatingfurnacetransferefficiencycomingfromforeignfactoriesarepresented.Accordingtothesemethods,everyfurnacezonetemperaturesascontrolvariable,targetdischargingtemperatureandtemperaturedifferenceinslabthicknessandthetemperaturebetweenneighbouringzonesaswellaszonetemporarytemperatureasrestrictions,minimalenergyconsumingasoptimizingtarget.Baosteelpreheatingfurnacemodelstructureandthecomplicatedmappingrelationofcontrolparametersetandstatesetandaimsetarepresented.Importantbasicmodelsinthepreheatingfurnacemodelsystemareanalysedincludingtemperaturetrackingmodelandtemperatureforecastingmodelanddischargingpacingmodelandslabheatingcurve.Firstslabtemperaturemodelstructureanditsperiphericparameterareintroduced;secondtwopacingmodelsaregivenincludingtimingpacingmodeusingfixeddischargingintervalandmillpacingcontrolmodeusingmillrollingpacingwhileBaosteelpacingforecastingmodelusinglongtermandshorttermforecastingmode)isgiven;thirdaheatingcurvemathematicalmodelconsideringheatingqualityandrollingpaceandenergyconsumingispresented;

  • 标签:
  • 简介:Transmissionperformanceofelectroabsorptionmodulatorin10Gb/stransmissionsystemshasbeensimulatedandanalyzedundertheconditionoftakingintoaccountthechirp,extinctionratio,transmissivityandrise/falltime.ResultsshowthatshorttransmissiondistancewithoutEDFAafterEAMcanbeusedinfuturemetropolitanareanetwork,butthetransmissivitymustbecarefullyconsidered.Thesamplingtimerangeanddecisionlevelcanbeoptimizedtoreducethebiterrorratio.

  • 标签: 电吸收调制器 透射率 决策水平 取样 短距离传输系统
  • 简介:Usinggeneralizedunivexfunctions,anondifferentiablemultiple-objectiveoptimizationproblemisconsidered.Kuhn-Tuckertypesufficientoptimalityconditionsareobtainedforafeasiblepointtobeanefficientorproperlyefficientsolution.Mond-Weirtypedualityprogrammingisconstructed,theweakandstrongdualitytheoremsareproved.

  • 标签: multiple-objective optimization EFFICIENT SOLUTIONS PROPERLY EFFICIENT
  • 简介:在这份报纸,混合自动优化策略为设计被建议在水下机器人线。Isight作为一个集成平台被介绍。这个平台的构造包括UG6.0,GAMBIT2.4.6和FLUENT12.0基于用户编程和几个商业软件。一个聪明的参数优化方法,粒子群优化,被合并到平台。为了验证策略,求婚了,模拟被进行在上在水下机器人为5470建模,它从DTRCSUBOFF工程发源。与自动优化平台,最小的抵抗作为优化目标被拿;是的湿表面区域限制条件;象设计变量的船身前半部,最大的身体半径和船体后部最小半径的长度。随CFD计算,RANS方程和标准骚乱模型被用于直接数字的模拟。由模拟结果的分析,平台效率高,这被结束。通过平台,为线的设计的许多计划被产生,最佳的解决方案被完成。聪明的优化算法和数字模拟的联合保证一个全球最佳的答案并且改进寻找的答案的效率。

  • 标签: 水下机器人 线条设计 优化策略 混合式 直接数值模拟 智能优化算法
  • 简介:ItisdifficulttodesignaplatewithwideattenuationzonesinlowfrequencyregionbasedonBraggscatteringmechanism.Aplatewithperiodicrhombusholesisoptimizedanddesigned.Basedonthefiniteelementmethodunderperiodicboundaryconditions,thein-planedispersioncurvesofperiodicallyperforatedplatearecalculatedviaCOMSOL.ThefrequencyresponsesofperiodicallyperforatedplateareinvestigatedviaANSYSsimulation.Theplateswithperiodicholesaresuspendedanddynamicallytestedundersinusoidalexcitations.Theresultsshowthataperiodicallyperforatedplatewithrhombusholeshaswiderattenuationzonesthanplateswithcircularandhexagonalholes.Materialpropertieshaveagreatinfluenceonattenuationzones:nitrile-butadienerubberandsiliconrubbercaneasilyobtainlow-frequencyzones,whileincreasingporositycreateslowerandwiderzones.Thewidthofattenuationzoneincreasesasthehorizontalangleoftherhombusholesincreases.Ananalysisoftheattenuationzones'generationmechanismshowsthattheplatewithperiodicholesexhibitscharacteristicsofBraggscatteringandlocalresonantphononiccrystal,indicatinganinherentrelationshipbetweentwotypesofmechanisms.Theoptimizedplatehasacompleteattenuationzonerangingfrom5281.76-8824.30Hz.Thevibrationsaresignificantlyreducedwhenthenumberofperiodsisnolessthantwo.Theattenuationrangeobtainedviathenumericalmethodisgenerallyconsistentwiththeexperiment.Theresearchshedslightonthenoiseinsulationplateandhasthepotentialtoimprovethesoundenvironmentinvariousapplicationsduetoitssimplemanufacturing.

  • 标签: IN-PLANE ATTENUATION ZONE PLATE with PERIODIC
  • 简介:小分子有铟听氧化物(ITO)的结构的器官的太阳能电池(振荡)/molybdenum三氧化物(MoO3)(5nm)/rubrene(nm)/fullerene(C70)(ynm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)(6nm)/aluminum(艾尔)(150nm)被制作。为设备的活跃的层的厚度在细节被调查。结果证明rubrene层和C70层的最佳厚度分别地是30nm和25nm。设备的降级也被调查。,结果显示开电路的电压(Voc)不变化电线走火电流密度(Jsc),用时间连续地填满因素(FF)和功率变换效率(PCE)减少。降级能在周围的扩散并且渗透到活跃材料并且在房间与C70反应被归因于氧,它能导致界面的系列电阻的增加。

  • 标签: 有机太阳能电池 异质结 退化 优化 短路电流密度 功率转换效率
  • 简介:Structuraloptimizationforcrashworthinesscriteriaisofparticularsignificanceespeciallyatearlystageofdesign.ThecomparativestudyofKrigingandradialbasisfunctionnetwork(RBFN)wasperformedinordertoimprovethecrashworthinesseffectsofhoneycomb.ImprovingthecrashworthinesscharacteristicofhoneycombwasachievedusingLS-OPTanddomainreductionstrategy.Thisoptimizationisperformedonthebasisofvalidatednumericalsimulationtoestablishtheapproximatedmodeltoillustratetherelationshipbetweentheresponsesanddesignvariables.TheresultsshowedthatKrigingmeta-modelisexcelledinaccuracy,robustnessandefficiencycomparedtoradialbasisfunction(RBF)andcrashworthinesscharacteristicofhoneycombisimprovedby4%.

  • 标签: 径向基函数神经网络 克里格法 优化使用 蜂窝 RBFN 耐撞性
  • 简介:Thisworkproposesamethodtoconcurrentlycalibratemultipleacousticspeedsindifferentmediumswithaphotoacoustic(PA)andultrasound(US)dual-modalityimagingsystem.First,physicalinfrastructureinformationofthetargetisacquiredthroughaUSimage.Then,werepeatedlybuildPAimagesaroundaspecialtargettoyieldthebestfocusedresultbydynamicallyupdatingtheacousticspeedsinadifferentmediumofthetarget.Withthesecorrectacousticpropagationvelocitiesintheaccordingmediums,wecaneffectivelyoptimizethePAimagequalityastheexperimentsproved,whichmightbenefitfutureresearchinbiomedicalimagingscience.

  • 标签: 光声层析成像 传播速度 质量优化 自适应 校正 图像质量
  • 简介:ThispapergivesanewsubspacecorrectionalgorithmfornonlinearunconstrainedconvexoptimizationproblemsbasedonthemultigridapproachproposedbyS.Nashin2000andthesubspacecorrectionalgorithmproposedbyX.TaiandJ.Xuin2001.Undersomereasonableassumptions,weobtaintheconvergenceaswellasaconvergencerateestimateforthealgorithm.Numericalresultsshowthatthealgorithmiseffective.

  • 标签: 凸优化问题 子空间 无约束 非线性 校正方法 收敛率估计
  • 简介:Toobtainasuitableconditionforelectroporationtransformationinindicarice,the10-day-oldimmatureembryoswereselectedforoptimizationexperiments.Theresultsshowedthatonepulseat850V/cm,950μFcapacitance,200μLelectroporationbufferwith70mmol/Lsodiumglutamate,100μg/mLplasmid,50μg/mLcarrierDNA,20embryospercuvette,0°CtreatmentandCCmediumwerethebestparameters,whichnotonlyimprovedthetransformationefficiencyto30.89%,butalsoamelioratedtheembryosurvivalratioto95.92%.Tofurtherverifythepracticabilityofthiscondition,theembryosfromanotherindicaricevarietyandaricetypeIImetallothionein-likegene(OsMT2bL)promoter::mgfp5::gusAconstructweretested,andspecificGUSexpressionontheembryoswasvisualizedbyhistochemicalstaining.TheresultsshowedthattheGUSexpressionontheembryosactivatedbytheOsMT2bLpromoterwasmainlyconcentratedontheapicalpointoftheplumulewhereastheexpressiondrivenbyCaMV35Spromoterwasdistributedonnearlyallareasoftheelectroporatedtissues.Theseresultsindicatedthattheoptimizedembryoelectroporationconditionscouldbeusednotonlyingenetictransformationofindicaricebutalsoinassayofgeneregulationonembryos.

  • 标签: 电穿孔 稻子 胚芽 瞬变现象
  • 简介:Theshiphullsurfaceoptimizationbasedonthewaveresistanceisanimportantissueintheshipengineeringindustry.Thewaveletmethodmayprovideaconvenienttoolforthesurfacehulloptimization.Asapreliminarystudy,weusethewaveletmethodtooptimizethehullsurfacebasedontheMichelwaveresistanceforaWigleymodelinthispaper.Firstly,weexpressthemodel’ssurfacebythewaveletdecompositionexpressionsandobtainareconstructedsurfaceandthenvalidateitsaccuracy.Secondly,werewritetheMichelwaveresistanceformulainthewaveletbases,resultinginasimpleformulacontainingonlytheshiphullsurface’swaveletcoefficients.Thirdly,wetakethesewaveletcoefficientsasoptimizationvariables,andanalyzethemainwaveresistancedistributionintermsofscalesandlocations,toreducethenumberofoptimizationvariables.Finally,weobtaintheoptimalhullsurfaceoftheWigleymodelthroughgeneticalgorithms,reducingthewaveresistancealmostbyahalf.Itisshownthatthewaveletmethodmayprovideanewapproachforthehulloptimization.

  • 标签: 船体表面 优化变量 小波方法 兴波阻力 表示模型 阻力公式
  • 简介:由Ginchev在我们证明足够、必要的optimality条件的那一些的这篇文章获得了,Guerraggio,Luc[Appl。数学,51,5鈥?6(2006)]概括(严格地)那些由Guerraggio介绍了,Luc[J。Optim。理论Appl,109,615鈥?29(2001)]。当以前的纸显示出在那里给的条件是有效的为例子时但是从后者纸的失败,它不通常证明那它建议的条件更强壮。在现在的笔记,我们与缺乏的证明完成这比较。关键词C1,1功能-概括秒顺序方向性的衍生物-Dini衍生物-弱有效的minimizer-秒顺序先生(2000)题目分类49K10的孤立的minimizer-49J52-49J50-90C29-90C30由捷克的管理(MSM6198959214)的委员会支持了

  • 标签: 向量优化 比赛成绩 OPTIM纤维 充分条件 证明 数学
  • 简介:基于长时期的纤维栅栏(LPFG)的双山峰回声,一个新奇电影传感器被介绍,在哪个对包围气体敏感的电影在反响的波长与这部电影改变的双山峰的纤维栅栏区域,和间隔的cladding上是涂的折射索引。根据夫妇模式理论,一个三元组穿着的数字模型被开发分析在敏感Sn和薄电影之间的关系光参数(电影厚度h3并且折射索引n3)并且纤维栅栏参数(栅栏时期螞和核心索引调整蟽)。由使用优化方法,最佳的电影光参数和栅栏结构参数被获得。到这些电影的折射索引的这个计划的敏感被预言到的数字模拟表演是超过10?7。理论上的分析为实际高度敏感的电影传感器提供直接基础。

  • 标签: 纤维光栅 薄膜 敏感器 共振
  • 简介:Microarraydataareoftenextremelyasymmetricindimensionality,suchasthousandsoreventensofthousandsofgenesbutonlyafewhundredsofsamplesorless.Suchextremeasymmetrybetweenthedimensionalityofgenesandsamplescanleadtoinaccuratediagnosisofdiseaseinclinic.Therefore,ithasbeenshownthatselectingasmallsetofmarkergenescanleadtoimprovedclassificationaccuracy.Inthispaper,asimplemodifiedantcolonyoptimization(ACO)algorithmisproposedtoselecttumor-relatedmarkergenes,andsupportvectormachine(SVM)isusedasclassifiertoevaluatetheperformanceoftheextractedgenesubset.Experimentalresultsonseveralbenchmarktumormicroarraydatasetsshowedthattheproposedapproachproducesbetterrecognitionwithfewermarkergenesthanmanyothermethods.IthasbeendemonstratedthatthemodifiedACOisausefultoolforselectingmarkergenesandmininghighdimensiondata.

  • 标签: 基因选择 蚁群优化 优化算法 肿瘤标记 选择标记基因 支持向量机