简介：Timeefficiencyofkeyestablishmentandupdateisoneofthemajorproblemscontributorykeymanagementsstrivetoaddress.Toachievebettertimeefficiencyinkeyestablishment,weproposeaLocation-basedHuffman(L-Huffman)scheme.First,usersareseparatedintoseveralsmallgroupstominimizecommunicationcostwhentheyaredistributedoverlargenetworks.Second,bothuser'scomputationdifferenceandmessagetransmissiondelayaretakenintoconsiderationwhenHuffmancodingisemployedtoformingtheoptimalkeytree.Third,thecombinedweightsinHuffmantreearelocatedinahigherplaceofthekeytreetoreducethevarianceoftheaveragekeygenerationtimeandminimizethelongestkeygenerationtime.SimulationsdemonstratethatL-HuffmanhasmuchbetterperformanceinwideareanetworksandisalittlebetterinlocalareanetworkthanHuffmanscheme.

简介：Inthispaper,alocal-learningalgorithmformulti-agentispresentedbasedonthefactthatindividualagentperformslocalperceptionandlocalinteractionundergroupenvironment.Asforin-dividual-learning,agentadoptsgreedystrategytomaximizeitsrewardwheninteractingwithenvi-ronment.Ingroup-learning,localinteractiontakesplacebetweeneachtwoagents.Alocal-learningalgorithmtochooseandmodifyagents'actionsisproposedtoimprovethetraditionalQ-learningalgorithm,respectivelyinthesituationsofzero-sumgamesandgeneral-sumgameswithuniqueequi-libriumormulti-equilibrium.Andthislocal-learningalgorithmisprovedtobeconvergentandthecomputationcomplexityislowerthantheNash-Q.Additionally,throughgrid-gametest,itisindicatedthatbyusingthislocal-learningalgorithm,thelocalbehaviorsofagentscanspreadtoglobe.

简介：Anovelbroadcastencryptionschemeforgroupcommunicationscenariosindistributednetworksispresented.Inthescheme,anyoneisallowedtoencryptamessageanddistributeittoadesignatedgroup.Eachmemberinthedesignatedgrouphastheabilitytoindependentlydecryptaciphertext.Incontrasttotraditionalbroadcastencryption,allthevalidreceiversintheproposedschemecomposethedesignatedgroup.Totakeadvantageofthisproperty,atabforthegroupissetandthematchingprivatekeyforeachmemberisgenerated.Inaddition,beforedecryptingaciphertext,anyoneintheschemecanverifytheciphertext,toensurethattheciphertextiscorrect.Thispropertyisveryimportantforlarge-scalegroupcommunication,asthegatewaycanfilterincorrectciphertextandalleviatethereceiver'sworkload.Finally,aproofintherandomoraclemodelisgiven,toshowthattheproposedschemeissecureagainsttheadaptivelychosenciphertextattack.

简介：TheconventionaltransmitantennaselectionforVerticalBellLaboratoriesLayeredSpaceTime(V-BLAST)systemisverycomplexbecauseitneedstocomputetheinverseofchannelmatricestimeaftertime.Inthispaper,anewgrouptransmitantennaselectionschemeforV-BLASTsystemisproposed.The1stgrouptransmitantennasaredecidedaccordingtoacertainselectioncriterionamongtheavailableantennas.Then,withGroupInterferenceSuppression(GIS)technology,theinterferencesofthetransmitsymbolsfromtheselectedantennascanbesuppressed.Finally,the2ndgrouptransmitantennasaredecidedamongtheresidualavailableantennas.Simulationsshowthatitsperformanceislowerthanthatoftheconventionalselectionscheme.However,thenewselectionschemehaslowercomplexitythantheconventionalone.

简介：Inthispaper,wepresentasimplebutpowerfulensembleforrobusttextureclassification.Theproposedmethodusesasingletypeoffeaturedescriptor,i.e.scale-invariantfeaturetransform(SIFT),andinheritsthespiritofthespatialpyramidmatchingmodel(SPM).Inaflexiblewayofpartitioningtheoriginaltextureimages,ourapproachcanproducesufficientinformativelocalfeaturesandtherebyformareliablefeaturepondortrainanewclass-specificdictionary.Totakefulladvantageofthisfeaturepond,wedevelopagroup-collaborativelyrepresentation-basedstrategy(GCRS)forthefinalclassification.Itissolvedbythewell-knowngrouplasso.Butwegobeyondofthisandproposealocality-constraintmethodtospeedupthis,namedlocalconstraint-GCRS(LC-GCRS).Experimentalresultsonthreepublictexturedatasetsdemonstratetheproposedapproachachievescompetitiveoutcomesandevenoutperformsthestate-of-the-artmethods.Particularly,mostofmethodscannotworkwellwhenonlyafewsamplesofeachcategoryareavailablefortraining,butourapproachstillachievesveryhighclassificationaccuracy,e.g.anaverageaccuracyof92.1%fortheBrodatzdatasetwhenonlyoneimageisusedfortraining,significantlyhigherthananyothermethods.

简介：Uncertainandhesitantinformation,widelyexistinginthereal-worldqualitativedecisionmakingproblems,bringsgreatchallengestodecisionmakers.Hesitantfuzzylinguistictermsets(HFLTSs),aneffectivelinguisticcomputationaltoolinmodelingandelicitingsuchinformation,havehencearousedmanyscholars’interestsandsomeextensionshavebeenintroducedrecently.However,thesemethodsarebasedonthediscretelinguistictermframeworkwiththelimitedexpressiondomain,whichactuallydepictqualitativeinformationusingseveralsinglevalues.Therefore,itishardtoensuretheintegrityofthesemanticsrepresentationandtheaccuracyofthecomputationresults.Todealwiththisproblem,asemanticsbasisframeworkcalledcompletelinguistictermset(CLTS)isdesigned,whichadoptsaseparationstructureoflinguisticscaleandexpressiondomain,enrichingsemanticsrepresentationofdecisionmakers.Onthisbasistheconceptoffuzzyintervallinguisticsets(FILSs)isputforwardthatemploystheintervallinguistictermwithprobabilitytoincreasetheflexibilityofelicitingandrepresentinguncertainandhesitantqualitativeinformation.Forpracticalapplications,afuzzyintervallinguistictechniquefororderpreferencebysimilaritytoidealsolution(FILTOPSIS)methodisdevelopedtodealwithmulti-attributegroupdecisionmaking(MAGDM)problems.Throughthecasesofmovieandenterpriseresourceplanning(ERP)systemselection,theeffectivenessandvalidityoftheproposedmethodareillustrated.

简介：Astooppositional,multi-objectiveandhierarchicalcharacteristicofairformationtogroundattack-defendscampaign,andusingdynamicspacestatemodelofmilitarycampaign,thisarticleestablishesaprincipalandsubordinatehierarchicalinteractivedecision-makingway,theNash-Stackelberg-Nashmodel,tosolvetheproblemsinmilitaryoperation,andfindouttheassociatedbeststrategyinhierarchicaldynamicdecision-making.Thesimulatingresultindicatethatwhenapplyingthemodeltoairformationtogroundattack-defendsdecision-makingsystem,itcansolvetheproblemsoftwohierarchies'dynamicoppositionaldecision-makingfavorably,andreachpreferableeffectinbattle.Itprovesthatthemodelcanprovideaneffectivewayforanalyzingabattle.

简介：Inordertomeettheneedsofhigh-speeddevelopmentofopticalcommunicationsystem,aconstructionmethodofquasi-cycliclow-densityparity-check(QC-LDPC)codesbasedonmultiplicativegroupoffinitefieldisproposed.TheTannergraphofparitycheckmatrixofthecodeconstructedbythismethodhasnocycleoflength4,anditcanmakesurethattheobtainedcodecangetagooddistanceproperty.Simulationresultsshowthatwhenthebiterrorrate(BER)is10-6,inthesamesimulationenvironment,thenetcodinggain(NCG)oftheproposedQC-LDPC(3780,3540)codewiththecoderateof93.7%inthispaperisimprovedby2.18dBand1.6dBrespectivelycomparedwiththoseoftheRS(255,239)codeinITU-TG.975andtheLDPC(32640,30592)codeinITU-TG.975.1.Inaddition,theNCGoftheproposedQC-LDPC(3780,3540)codeisrespectively0.2dBand0.4dBhighercomparedwiththoseoftheSG-QC-LDPC(3780,3540)codebasedonthetwodifferentsubgroupsinfinitefieldandtheAS-QC-LDPC(3780,3540)codebasedonthetwoarbitrarysetsofafinitefield.Thus,theproposedQC-LDPC(3780,3540)codeinthispapercanbewellappliedinopticalcommunicationsystems.

简介：Amethodofminimizingrankingsinconsistencyisproposedforadecision-makingproblemwithrankingsofalternativesgivenbymultipledecisionmakersaccordingtomultiplecriteria.Foreachcriteria,atfirst,thetotalinconsistencybetweentherankingsofallalternativesforthegroupandtheonesforeverydecisionmakerisdefinedafterthedecisionmakerweightsinrespecttothecriteriaareconsidered.Similarly,thetotalinconsistencybetweentheirfinalrankingsforthegroupandtheonesundereverycriteriaisdeterminedafterthecriteriaweightsaretakenintoaccount.Thentwononlinearintegerprogrammingmodelsminimizingrespectivelythetwototalinconsistenciesabovearedevelopedandthentransformedtotwodynamicprogrammingmodelstoobtainseparatelytherankingsofallalternativesforthegroupwithrespecttoeachcriteriaandtheirfinalrankings.Asupplierselectioncaseillustratedtheproposedmethod,andsomediscussionsontheresultsverifieditseffectiveness.Thisworkdevelopsanewmeasurementofordinalpreferences’inconsistencyinmulti-criteriagroupdecision-making(MCGDM)andextendsthecook-seifordsocialselectionfunctiontoMCGDMconsideringweightsofcriteriaanddecisionmakersandcanobtainuniquerankingresult.

简介：Inthispaper,anextendedKendallmodelforthepriorityschedulinginput-linegroupoutputwithmulti-channelinAsynchronousTransferMode(ATM)exchangesystemisproposedandthenthemeanmethodisusedtomodelmathematicallythenon-typicalnon-anticipativePRiorityservice(PR)model.Comparedwiththetypicalandnon-anticipativePRmodel,itexpressesthecharacteristicsofthepriorityschedulinginput-linegroupoutputwithmulti-channelinATMexchangesystem.ThesimulationexperimentshowsthatthismodelcanimprovetheHOLblockandtheperfonnanceofinput-queuedATMswitchnetworkdramatically.ThismodelhasabetterdevelopingprospectinATMexchangesystem.

简介：TSMC于美西时间13日在美国加州圣荷西市举行技术研讨会，会中宣布将跳过22nm工艺，直接发展20nm工艺。此系基于“为客户创造价值”而作的决定，提供客户一个更可行的先进工艺选择。

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简介：创新的科技赋予了新型SIPLACEX系列产品可靠、快速和精准的特性。X系列的主要改进之一是最新开发的20吸嘴收集贴装头。四个此类贴装头可被安装于四悬臂设备配置中，并能在55μm@4sigma精度下达到80，000cph的贴装性能。此款贴装头配有20个吸嘴，

简介：<正>Diodes公司推出全新20VNPN及PNP双极晶体管,它们采用超小型DFN1411-3表面贴装封装,能大大提升电源管理电路的功率密度和效率。该器件采用了Diodes第五代矩阵射极双极工艺设计(5matrixemitterBipolarprocess)。这对互补性器件ZXTN26020DMF和ZXTP26020DMF的占位面积只有1.1毫米×1.4毫米,离版高度为0.5毫米,有助于设计出极其纤巧的便携式产品,还可改善产品的电性能及热特性。

简介：<正>半导体产业整并(Consolidation)现象将更加明显。半导体晶圆制造商的资本密集度在20纳米(nm)及其以下的制程之后,将呈现更惊人的倍数增长态势,因此能负担如此巨额资本资出(CAPEX)的厂商家数愈来愈少,带动半导体设备商、IC设计业者加速展开购并,以力巩市场势力版图。

简介：<正>据香港中通社报道,台湾"国研院"纳米(台称"奈米")组件实验室日前开发出全球最小的9纳米功能性电阻式内存(R-RAM)数组晶胞;这个新内存在几乎不需耗电的情况下,1平方厘米面积内可储存1个图书馆的文字数据,将让信息

简介：12月18日．19日．25日．26日．佳能公司在北京艺术设计学院举办了主置为“体验20D共赏EOS”的系列讲座和体验活动．同样的活动也将在上海．广州陆续进行。

简介：<正>根据市场研究机构YoleDevelopment的最新统计数据,全球前二十大微机电系统(MEMS)代工厂的2011年合并营收较2010年成长了5%,超越6亿美元;不过代工业务在整体MEMS市场所占据的比例仍然相对较小。根据Yole统计,2011年全球MEMS市场规模为102亿美元,年成长率19%,而MEMS代工厂营收在其中占据的比例呈现减少趋势。

简介：台湾稳懋半导体是全球首座以六英寸晶圆生产砷化镓电路的专业晶圆代工服务厂。近期,稳懋完成了新一轮晶圆厂翻新扩张,对其第三家最新的晶圆厂（FabC）配备最先进的净化间、工艺线和砷化镓微波集成电路（GaAsMMIC）生产设备,以及复合半导体外延生长、制造和光学检测设备。稳懋主要提供HBT、pHEMT、集成BiHEMT方案和光学设备,用于功率放大器、WiFi、无线区域性网络基建和光学市场。