简介：Theoptimizationofthefiber-coupledterahertztime-domainspectroscopy(THz-TDS)systemisperformedbychangingthepolarizationoftheopticalexcitationpulsecenteredat1550nm.InGaAs/InAlAsmultilayerstructuresbasedphotoconductiveantennasareusedinTDSsetupasboththeemitterandreceiver.TheexperimentalresultsdemonstratethatnotonlytheTHzsignalpowerbutalsothetemporalwaveformvarywiththerotationoftheexcitingpulsepolarization.Maximumoutputpoweroftheemitterisobtainedwhenthepolarizationofthepumppulseisperpendiculartotheedgeofthemetalelectrodes.AtthismomenttheTHzwaveformisclosetoasingle-cycledpulse.However,doubleTHzpulsescouldberecordedwhenthepumplaserpolarizationisparalleltotheelectrodes.Laserpulsesplittinginducedbythebirefringenceoftheopticalfibermayattributetothepolarizationdependentperformanceofthefiber-coupledTHz-TDSsystem.

简介：Demandresponse(DR)isgainingmoreandmoreimportanceinthearchitectureofpowersystemsinacontextofflexibleloadsandhighshareofintermittentgeneration.ChangesinelectricitymarketsregulationinseveralcountrieshaverecentlyenabledaneffectiveintegrationofDRmechanismsinpowersystems.Throughitsflexiblecomponents(pumps,tanks),drinkingwatersystemsaresuitablecandidatesforenergy-efficientDRmechanisms.However,thesesystemsareoftenmanagedindependentlyofpowersystemoperationforbotheconomicandoperationalreasons.Indeed,asufficientlevelofeconomicviabilityandwaterdemandsriskmanagementarenecessaryforwaterutilitiestointegratetheirflexibilitiestopowersystemoperation.Inthispaper,weproposedamathematicalmodelforoptimizingpumpschedulesinwatersystemswhiletradingDRblocsinaspotpowermarketduringpeaktimes.Uncertaintiesaboutwaterdemandswereconsideredinthemathematicalmodelallowingtoproposepowerreductionscoveringthepotentialriskofreal-timewaterdemandforecastinginaccuracy.NumericalresultswerediscussedonarealwatersysteminFrance,demonstratingbotheconomicandecologicalbenefits.

简介：Arationalapproximationmethodofthefractional-orderderivativeandintegraloperatorsisproposed.TheturningfrequencypointsarefixedineachfrequencyintervalinthestandardOustaloupapproximation.IntheimprovedOustaloupmethod,theturningfrequencypointsaredeterminedbytheadaptivechaoticparticleswarmoptimization(PSO).TheaveragevelocityisproposedtoreducetheiterationsofthePSO.Thechaoticsearchschemeiscombinedtoreducetheopportunityoftheprematurephenomenon.Twofitnessfunctionsaregiventominimizethezero-poleandamplitude-phasefrequencyerrorsfortheunderlyingoptimizationproblems.Somenumericalexamplesarecomparedtodemonstratetheeffectivenessandaccuracyofthisproposedrationalapproximationmethod.

简介：Anewapproachtoknowledgeacquisitioninincompleteinformationsystemwithfuzzydecisionsisproposed.Insuchincompleteinformationsystem,theuniverseofdiscourseisclassifiedbythemaximaltoleranceclasses,andfuzzyapproximationsaredefinedbasedonthem.Threetypesofrelativereductsofmaximaltoleranceclassesarethenproposed,andthreetypesoffuzzydecisionrulesbasedontheproposedattributedescriptionaredefined.ThejudgmenttheoremsandapproximationdiscernibilityfunctionswithrespecttothemarepresentedtocomputetherelativereductbyusingBooleanreasoningtechniques,fromwhichwecanderiveoptimalfuzzydecisionrulesfromthesystems.Atlast,threetypesofrelativereductsofthesystemandtheircomputingmethodsaregiven.

简介：ThispaperinvestigatestheuntraditionalapproachofcontentionresolutioninWavelengthDivisionMultiplexing(WDM)OpticalPacketSwitching(OPS).Themoststrikingcharacteristicsofthedevelopedswitcharchitectureare:(1)ContentionresolutionisachievedbyacombinedsharingofFiberDelay-Lines(FDLs)andTunableOpticalWavelengthConverters(TOWCs);(2)FDLsarearrangedinnon-degenerateform,i.e.,non-uniformdistributionofthedelaylines;(3)TOWCsjustcanperformwavelengthconversioninpartialcontinuouswavelengthchannels,i.e.,sparsewavelengthconversion.TheconcreteconfigurationsofFDLsandTOWCsaredescribedandanalyzedundernon-burstyandburstytrafficscenarios.Simulationresultsdemonstratethatforaprefixedpacketlossprobabilityconstraint,e.g.,10-6,thedevelopedarchitectureprovidesadifferentpointofviewinOPSdesign.Thatis,combinedsharingofFDLsandTOWCscan,effectively,obtainagoodtradeoffbetweentheswitchsizeandthecost,andTOWCswhichareachievedinsparseformcanalsodecreasetheimplementingcomplexity.

简介：Basedonsignalspaceconcepts,atransmissionerrorcodeperformanceforMPSK,squareMQAMandstarMQAMmodulationschemesontheAGWNchannelisanalyzed.ThecorrespondingBERformulasandcomputeraidednumericresultsarealsogiven.ThereforeitprovidesatheoreticalbasisforchoosingMQAMmodulationschemesinmobilecommunications.

简介：Themixedl1/H2optimizationproblemforMIMO(multipleinput-multipleoutput)discrete-timesystemsisconsidered.Thisproblemisformulatedasminimizingthel1-normofaclosed-looptransfermatrixwhilemaintainingtheH2-normofanotherclosed-looptransfermatrixatprescribedlevel.ThecontinuitypropertyoftheoptimalvalueinrespecttochangesintheH2-normconstraintisstudied.Theexistenceoftheoptimalsolutionsofmixedll/H2problemisproved.Becausethesolutionofthemixedl1/H2problemisbasedonthescaled-Qmethod,itavoidsthezerointerpolationdifficulties.Theconvergentupperandlowerboundscanbeobtainedbysolvingasequenceoffinitedimensionalnonlinearprogrammingforwhichmanyefficientnumericaloptimizationalgorithmsexist.

简介：一个光标签的标签扑灭比率和分散赔偿正在交换传播系统优化，它采用40-Gb/s回来到调音的零微分阶段移动(RZ-DPSK)用622-Mb/s振幅移动调音标记的收费载重(问)控制数据。在我们的计划，收费载重和标签的接收装置敏感分别地完成-27.8dBm和-33.5dBm。在在40km上播送了以后，60km和80km挑选模式纤维(SMF)(与分散赔偿)分别地，收费载重能没有力量惩罚被恢复，当标签能与不到2dB惩罚被恢复时。