简介：Deadlockmustbeavoidedinamanufacturingsystem.Inthispaper,anefficientalgorithmforfindinganoptimaldeadlock-freeschedulesinamanufacturingsystemwithverylimitedbufferispresented.Thisalgorithmisbasedonheeffectivegeneticalgorithm(GA)searchmethod,andaformalPetrinetstructureisintroducedtodetectthetokenplayerassuringdeadlock-free.InordertomaketheschedulingstrategygeneratedbyGAmeettherequiredconstraintofdeadlock-free,someresultsofthestruetureanalysisofPetrinetareinvolvedasacriteriontoselectdeadlock-freeschedulefromthepopulationgeneratedbyGA.Theeffectivenessandefficiencyoftheproposedapproachisillustratedbyusinganexample.

简介：

简介：Geographiclocationofnodesisveryusefulinasensornetwork.Previouslocalizationalgorithmsassumethatthereexistsomeanchornodesinthiskindofnetwork,andthenothernodesareestimatedtocreatetheircoordinates.Oncetherearenotanchorstobedeployed,thoselocalizationalgorithmswillbeinvalidated.Manypapersinthisfieldfocusonanchor-basedsolutions.Theuseofanchorsintroducesmanylimitations,sinceanchorsrequireexternalequipmentssuchasglobalpositionsystem,causeadditionalpowerconsumption.Anovelpositioningalgorithmisproposedtouseavirtualcoordinatesystembasedonanewconcept-virtualanchor.Itisexecutedinadistributedfashionaccordingtotheconnectivityofanodeandthemeasureddistancestoitsneighbors.Boththeadjacentmemberinformationandtherangingdistanceresultarecombinedtogeneratetheestimatedpositionofanetwork,oneofwhichisindependentlyadoptedforlocalizationpreviously.Atthepositionrefinementstagetheintermediateestimationofanodebeginstobeevaluatedonitsreliabilityforpositionmutation;thusthepositioningoptimizationprocessofthewholenetworkisavoidedfallingintoalocaloptimalsolution.Simulationresultsprovethatthealgorithmcanresolvethedistributedlocalizationproblemforanchor-freesensornetworks,andissuperiortopreviousmethodsintermsofitspositioningcapabilityunderavarietyofcircumstances.

简介：Onthebasisoffree-electronicbands,theFermienergyiscalculatedbysummingthebandeigenvaluesoverBrillouin-xones,andtheresultsmayleadtounderstandthephysicalbasisoftheaverage-bond-energymodelinthecalculationofvalence-bandoffsets.

简介：满足高为获得追踪尖精确性，追踪，并且指ATP的要求)空间光通讯的分系统，并且为在海上的活动平台之间的进一步光的通讯提供基础，试验性的系统，为好追踪执行部分是它有为错误赔偿的高频率和好性能的声音卷马达，被建立，并且整个系统能被个人计算机控制。一系列实验为为好追踪追踪错误的不同一致速度，和数据的模拟目标被做了，粗糙的追踪是镇定的，分析并且evaluateds独立，并且通讯激光的即时光电源也被收集。结果为随目标速度的增加追踪错误增加的ATP系统显示出那标准差，当追踪错误的范围看起来不是顺序时。而且，通讯连接能很长时间是抓住。

简介：Inthispaper,theproblemofcomputingthefreedistanceofTrellisCodedModulation(TCM)signalsequencehasbeendiscussed;anewalgorithm-thematrixalgorithmisproposed;andthestep-numberestimationproblemforstatetransmissiontocomputethefreedistanceofTCMsignalsequencehasbeentheoreticallysolved.ThematrixalgorithmisderivedfromtheViterbialgorithm,andisanimplementationofViterbialgorithmintheformofmatrix.Comparedwithotheralgorithms,thematrixalgorithmgainstwoadvantages:(1)Theexplicitsolution,anditsrelativelylesscomplexity.(2)Morereflexibleabilitytothesignalspacedistancevariation.Asexamples,theresultsofsomeTCMsignalsequenceonAWGNchannelandfadingchannelshavebeenpresented.

简介：Distortion-freedataembeddingisatechniquewhichcanassurethatnotonlythesecretdataiscorrectlyextractedbutalsothecovermediaisrecoveredwithoutanydistortionaftersecretdataisextractedcompletely.Becauseoftheseadvantages,thistechniqueattractstheattentionofmanyresearchers.Inthispaper,anewdistortion-freedataembeddingschemeforhighdynamicrange(HDR)imagesisproposed.BydependingonCartesianproduct,thisschemecanobtainhigherembeddingcapacitywhilemaintainingtheexactlyidenticalcoverimageandstegoimagewhenusingthetonemappingalgorithms.Inexperimentalresults,theproposedschemeissuperiortoYuetal.'sschemeinregardtotheembeddingrate?anaverageembeddingrateof0.1355bppcomparedwithYuetal.'sscheme(0.1270bpp).

简介：Certificatelessencryptionattractsalotofattentionsofarbyeliminatingthekeyescrowprobleminidentity-basedencryptionandpublickeycertificatesinthetraditionalpublickeycryptography.Byconsideringthethreatfromthekeyexposure,itisdesirabletoincorporatetheideaofkey-insulatedcryptosystemintothecertificatelessencryption.Inthispaper,wehavedesignedanefficientcertificatelesskeyinsulatedencryption(CL-KIE)schemetoachievethisgoal.Byourapproach,thecomputationalperformanceofourschemehasbeenimprovedsignificantlyintermsofreductiononrunningtimeandstorage.WealsogavethesecurityproofofthenewCL-KIEschemeagainstthechosenplaintextattacks(CPAs)intherandomoracle,consideringtheassumptionofthecomputationalDiffie-Hellman(CDH)problem.

简介：Withouttheassumptionthattheprivatekeysarekeptsecureperfectly,cryptographicprimitivescannotbedeployedintheinsecureenvironmentswherethekeyleakageisinevitable.Inordertoreducethedamagecausedbythekeyexposureintheidentity-based(ID-based)signaturescenariosefficiently,weproposeanID-basedkey-insulatedsignatureschemeinthispaper,whicheliminatestheexpensivebilinearpairingoperations.Comparedwiththepreviouswork,ourschememinimizesthecomputationcostwithoutanyextracost.Underthediscretelogarithm(DL)assumption,asecurityproofofourschemeintherandomoraclemodelhasalsobeengiven.

简介：Incontrastwiththeconventionalinjectorconsistingofdcgun,chopper,subharmonicbuncherand/orfundamentalbuncher,amicrowaveguncancooperatewithanalphamagnetasamorecompacthighbrightnessinjectorforthededicatedrflinearacceleratorsdrivinginfraredfreeelectronlasers(FELs).SuchaconcepthasbeenputintopracticeintheMARKIIIFELandwillbeusedintheBeijingFreeElectronLaser(BFEL)aswell.Inthispaper,thephasespread,energyspread,energyspread,emittancegrowthandintensityvariationofasingleelectronmicrobunchinsuchanFELacceleratorsystemareinvestigatedusingSUPERFISHandPARMELA.

简介：

简介：一个改进方法被建议模仿骚乱介绍的焕发，基于有限Markov州的模型。作为到文学的一个对比，一致地分布式的变量发生在某个状态期间，它比传统的Markov模型与更少状态贡献紧张变化的相等的模拟。它的也发现有20个状态的建议Markov模型在汽车协变性分析提供令人满意的近似给试验性的结果。而且，停止概率和吝啬的褪色时间是比有相等的状态的传统的Markov模型的那些更精确的。

简介：InGaAsP/InPmultiplequantumwellswithquantumwellintermixinghavebeenpreparedbyimpurity-freevacancydisordering.Theluminescentcharacteristicswereinvestigatedusingphotoluminescenceandphotoreflectance,fromwhichthebandgapblueshiftwasobserved.Si3N4,SiO2andSOGwereusedforthedielectriclayertoenhanceintermixingfromtheoutdiffusionofgroupIIIatoms.Allsampleswereannealedbyrapidthermalannealing.Theresultsindicatethatthebandgapblueshiftvarieswiththedielectriclayersandtheannealingtemperature.TheSiO2cappingwithanInGaAscladdinglayerwassuccessfullyusedtoinducelargerbandtuningeffectintheInGaAsP/InPMQWsthantheSi3N4cappingwithanInGaAscladdinglayer.Ontheotherhand,sampleswiththeSi3N4-InPcaplayercombinationalsoshowlargerenergyshiftsthanthatwithSiO2-InPcaplayercombination.

简介：是的巨大的部门操作广泛地为象图形的处理那样的设备作为最昂贵的操作之一接受了联合起来的完美地匹配的层(CPML)算法受不了的卷绕旋转的平行加速(GPU)，地可编程的门数组(FPGA)等等。在更高的效率和更低的电源消费的追求，这篇文章重游CPML理论并且建议了新快没有部门的平行CPML结构。由最佳地重排CPML内部重复进程，所有部门操作符能被recalculating消除并且代替脱机更新系数的相关的域。实验证明没有任何精确性损失，建议没有部门的结构能节省超过50%算术指令和传统的平行CPML结构的25%实行时间。

简介：Rod-likegoldnanoparticlescanbeformedfromHAuCl4aqueoussolutionwithultraviolet(UV)irradiationintheabsenceoftemplates,avoidingpossiblepoisonoussurfactantembeddedintothesurfaceoffunctionalgoldnanoparticlesappliedinbiomedicine.Theaspectratioofnanorodsrangesfrom1.1to4.4withtheconcentrationofHAuCl40.2mM,whichcanbeverifiedbyHRTEMimagesandtheabsorptionspectrum.Itisfoundthatthenanoclusterwithseveralatomsoccurspriortotheformationofnanorods,highlycorrespondingtoitstypicalabsorptionspectrum.TracingtheevolutioninabsorptionspectraofHAuCl4aqueoussolution,itcanbeconcludedthattheformationmechanismofgoldnanoparticlesinthisprocessisdifferentfromthatintheconventionalinductivegrowthmodel,possiblyinagrowthpatternwithimperfectorientedattachment(IOA)relevanttothecolliding-and-growing.

简介：Theoutageperformanceofthemultihopfree-spaceoptical(FSO)communicationsystemwithdecode-and-forward(DF)protocolisstudiedbyconsideringthejointeffectsofnonzeroboresightpointingerrorsandatmosphericturbulencemodeledbyexponentiatedWeibull(EW)distribution.Theclosed-formanalyticalexpressionofoutageprobabilityisderived,andtheresultsarevalidatedthroughMonteCarlosimulation.Furthermore,thedetailedanalysisisprovidedtoevaluatetheimpactsofturbulencestrength,receiveraperturesize,boresightdisplacement,beamwidthandnumberofrelaysontheoutageperformanceforthestudiedsystem.