简介:市场研究公司ICInsights最新出具的2010年全球晶圆代工企业排名中,台积电全年收入依旧位列全球第1,三星电子仅列全球第10。根据ICInsights的数据,三星2010年的晶圆代工业务收入达到4亿美元,
简介:Liriomyzahuidobrensis(Blanchard)是病理的一个重要蔬菜害虫。以便改进Liriomyzahuidobrensis的预言的精确性并且有效地控制Liriomyzahuidobrensis,这份报纸由主要部件分析(PCA)和背繁殖论述一个新预言模型人工的神经网络(BP-ANN)方法。人口出现上的从1999~2007的历史的数据被分析以便发现在害虫出现和气象学的因素之间的一种非线性的关系。然后由使用,分析结果,在在云南的Jianshui的Liriomyzahuidobrensis出现的预言模型被造。新模型成功地申请了在2006验证稻茎borer人口出现。测试结果证明新预言与BP-ANN当模特儿,PCA能改进预言精确性。
简介:Thispaperpresentsthedesignandsimulationofseveralfixed-tunedsub-harmonicmixerscoverfrequenciesfrom110GHto130GHz,215GHto235GHz,310GHto350GHz,and400GHto440GHz.Amongthem,120GHz,225GHz,330GHzsubharmonicmixersaredesignedwithflip-chippedplanarschottkydiodemountedontoasuspendedquartz-basedsubstrate,the225GHzand425GHzsubharmonicmixersareGaAsmembraneintegrated,andthe115GHzsubharmonicmixerhasbeenfabricatedandtestedalready.
简介:Thesingle-carrierblocktransmission(SCBT),a.k.a.,single-carrierfrequency-domainequalization(SC-FDE),isbeingconsideredasanoptiontechniqueforthewirelesspersonalareanetwork(WPAN)operatingat60GHz.Itisfoundthatforresidentialenvironment,innon-line-of-sight(NLOS)multi-pathchannels,theSCBTismuchmoreeffectivetocombattheinter-symbolinterference(ISI)comparedwithorthogonalfrequencydivisionmultiplexing(OFDM).Low-densityparity-check(LDPC)codesareaclassoflinearblockcodeswhichprovidenearcapacityperformanceonalargecollectionofdatatransmissionandstoragechannelswhilesimultaneouslyadmittingimplementabledecoders.TofacilitateusingLDPCcodesforSCBTsystem,anewlog-likelihoodratio(LLR)calculationmethodisproposedbasedonpilotsymbols(PS).GolaySequenceswhosesumautocorrelationhasauniquepeakandzerosidelobeareusedforcreatingthePS.ThepositionandlengthofthePSarenotfixedinthedatablocks.ThesimulationresultsshowthattheproposedmethodcansignificantlyimprovetheLDPCdecodingperformanceinSCBTsystem.Thisisverypromisingtosupportultrahigh-data-ratewirelesstransmission.
简介:Classifyingthetextureofgranulesin2Dimageshasarousedmanifoldresearchatten-tionforitstechnicalchallengesinimageprocessingareas.ThisletterpresentsanaggregatetextureidentificationapproachbyjointlyusingGrayLevelCo-occurrenceProbability(GLCP)andBPneuralnetworktechniques.First,upto8GLCP-associatedtexturefeatureparametersaredefinedandcomputed,andtheseconsequentparametersnextserveastheinputsfeedingtotheBPneuralnetworktocalculatethesimilaritytoanyofgivenaggregatetexturetype.Afinitenumberofaggregateimagesof3kinds,witheachcontainingspecifictypeofmineralparticles,areputtotheidentificationtest,experimentallyprovingthefeasibilityandrobustnessoftheproposedmethod.
简介:A10Gbit/srecirculatingsystemisconfiguredwithChirpedFiberBraggGrating(CFBG)forthedispersioncompensation.Forthefirsttime,thetransmissiondistanceintheloopreaches1000kmwithbiterrorrateof10-9.Theeffectofthegroupdelayrippleofthefibergratingisalsoinvestigatedintherecirculatingsystems,anditisshownthatthetransmissiondistanceislimitedto4cycles(4×167.1km)intheloopwiththepowerpenaltyfluctuationbelow1.0dB.Thusthegroupdelayrippleshouldbereducedtoallowforthewavelengthdriftof±5GHz.Attheendofthisletter,theprinciplesaregivenfordesigninglonghaulrecirculatingsystemswithdispersioncompensationCFBG.
简介:<正>市场研究机构ABIResearch的最新报告指出,虽然在2008年与2009年遭遇经济衰退,RFID市场在2010年复原状况良好,成长率略高于14%,达到53亿美元;若将汽车防盗(automobileimmobilization)硬件系统也加计在内,该市场
简介:Anultra-highspeed1:2demultiplexerforopticalfibercommunicationsystemsisdesignedutilizingtheIHP0.25μmSiGeBiCMOStechnology.Thelatchofthedemultiplexercorecircuitisresearched.Basedonthecurrentmeasurementcondition,ahigh-gainandwide-bandwidthclockbufferisdesignedtodrivelargeload.Transmissionlinetheoryforultra-highspeedcircuitsisusedtodesignmatchingnetworktosolvethematchingproblemamongtheinput,outputandinternalsignals.Thetransientanalysisshowsthatthisdemultiplexercandemultiplexone100Gb/sinputintotwo50Gb/soutputs.Thechipareaofitis0.7mm×0.47mm,theinputandoutputdataarebothat400mVP-PPCMLstandardvoltagelevel,andthepowerconsumptionoftheICis900mWatthepowersupplyof-4V.