简介：ymboliccircuitsimulatoristraditionallyappliedtothesmall-signalanalysisofanalogcircuits.Thispaperestablishesasymbolicbehavioralmacromodelingmethodapplicabletobothsmall-signalandlarge-signalanalysisofgeneraltwo-stageoperationalamplifiers(op-amps).Theproposedmethodcreatesatwo-poleparametricmacromodelwhoseparametersareanalyticalfunctionsofthecircuitelementparametersgeneratedbyasymboliccircuitsimulator.Amomentmatchingtechniqueisusedinderivingtheanalyticalmodelparameter.Thecreatedparametricbehavioralmodelcanbeusedforop-ampsperformancesimulationinbothfrequencyandtimedomains.Inparticular,theparametricmodelsarehighlysuitedforfaststatisticalsimulationofop-ampsinthetime-domain.Experimentresultsshowthatthestatisticaldistributionsoftheop-ampslewandsettlingtimecharacterizedbytheproposedmodelagreewellwiththetransistor-levelresultsinadditiontoachievingsignificantspeedup.

简介：Atpresent,thereisnoformalizeddescriptionoftheexecutingprocedureofworkflowmodels.Theprocedureofworkflowmodelsexecutinginworkflowengineisdescribedusingoperationalsemantic.Theformalizeddescriptionofprocessinstancesandactivityinstancesleadstoveryclearstructureoftheworkflowengine,haseasycooperationoftheheterogeneousworkflowenginesandguidestherealizationoftheworkflowenginefunction.Meanwhile,thesoftwareofworkflowenginehasbeencompletedbymeansoftheformalizeddescription.

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简介：Forsomelarge-scaleengineeringstructuresinoperatingconditions,modalparametersestimationmustbaseitselfonresponse-onlydata.Thisproblemhasreceivedaconsiderableamountofattentioninthepastfewyears.Itiswellknownthatthecross-correlationfunctionbetweenthemeasuredresponsesisasumofcomplexexponentialfunctionsofthesameformastheimpulseresponsefunctionoftheoriginalsystem.Sothispaperpresentsatime-domainoperatingmodalidentificationglobalschemeandafrequency-domainschemefromoutput-onlybycouplingthecross-correlationfunctionwithconventionalmodalparameterestimation.Theoutlinedtechniquesareappliedtoanairplanemodeltoestimatemodalparametersfromresponse-onlydata.

简介：ＴＹＰＨＯＯＮ：ＳＣＩＥＮＴＩＦＩＣ／ＯＰＥＲＡＴＩＯＮＡＬＥＸＰＥＲＩＭＥＮＴＳＡＮＤＤＹＮＡＭＩＣＴＨＥＯＲＥＴＩＣＡＬＳＴＵＤＹ￥ＣｈｅｎＬｉａｎｓｈｏｕ（陈联寿）ａｎｄＸｕＸｉａｎｇｄｅ（除祥德）ＴＹＰＨＯＯＮ：ＳＣＩＥＮＴＩＦＩＣ／ＯＰＥＲ...

简介：Afrequencyandspatialdomaindecompositionmethod(FSDD)foroperationalmodalanalysis(OMA)ispresentedinthispaper,whichisanextensionofthecomplexmodeindicatorfunction(CMIF)methodforexperimentalmodalanalysis(EMA).ThetheoreticalbackgroundoftheFSDDmethodisclarified.Singularvaluedecompositionisadoptedtoseparatethesignalspacefromthenoisespace.Finally,anenhancedpowerspectrumdensity(PSD)isproposedtoobtainmoreaccuratemodalparametersbycurvefittinginthefrequencydomain.Moreover,asimulationcaseandanapplicationcaseareusedtovalidatethismethod.

简介：ＭＯＮＴＨＬＹＡＮＤＳＥＡＳＯＮＡＬＯＰＥＲＡＴＩＯＮＡＬＮＵＭＥＲＩＣＡＬＷＥＡＴＨＥＲＰＲＥＤＩＣＴＩＯＮＩＮＴＨＥＳＵＭＭＥＲＯＦ１９９４ＳｏｎｇＱｉｎｇｌｉ（宋青丽）ａｎｄＺｈｅｎｇＱｉｎｇｌｉｎ（郑庆林）ＭＯＮＴＨＬＹＡＮＤＳＥＡＳＯＮＡＬ...

简介：Today,alongwiththeprevalentuseofportableequipment,wireless,andotherbatterypoweredsystems,thedemandforamplifierswithahighgain-bandwidthproduct(GBW),slewrate(SR),andatthesametimeverylowstaticpowerdissipationisgrowing.Inthiswork,anoperationaltransconductanceamplifier(OTA)withanenhancedSRisproposed.ByinsertingasensingresistorintheinputportofthecurrentmirrorintheOTA,thevoltagedropacrosstheresistorisconvertedintoanoutputcurrentcontainingaterminproportiontothesquareofthevoltage,andthentheSRoftheproposedOTAissignificantlyenhancedandthecurrentdissipationcanbereduced.TheproposedOTAisdesignedandsimulatedwitha0.5μmcomplementarymetaloxidesemiconductor(CMOS)process.ThesimulationresultsshowthattheSRis4.54V/μs,increasedby8.25timesthanthatoftheconventionaldesign,whilethecurrentdissipationisonly87.3%.

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简介：Uptothefifties,bulkoilcircultbreaker（c.b.）wasthemainbreakertypeusedinChina.Fromthesixtieson,allEHVc.b.wereair-blasttype,butowingtotheirairleakageandfrequentmaintenanceworkrequired,alotofminimumoilc.b.wereimported;intheseventies,minimumoilc.b.wasthemainbreakertypeusedalloverthecountryinthevoltagerangeof6-220kV;atthebeginningoftheeighties,500kVSF6.c.b.wereputinserviceandgraduallyex-tendeddownto220kV,110kVandevento10kV,theirnumberisincreasing.Atthesametime,mediumvoltagevacuumc.b.beganto

简介：Aversatilecurrent-modebiquadraticfilterusingthreeoperationalamplifiersandninepassiveelementsisproposed.Bysuitablychoosingtheoutputbranch,lowpass,bandpass,highpass,bandstopandallpasstransferfunctionsarerealizedsimultaneouslywithoutchangingthecircuitconfigurationandelements.Twocircuits,oneisforlowfrequencyapplicationandtheotherforhighfrequency,areproposed.Thecenterfrequency,qualityfactorandgainconstantsofthecircuitcanbetunedindependently.Simulatedresultsshowthatthecircuitsworksuccessfully.

简介：Smeconceptsusedinknowledgebasemaintenace,suchassequence,newlaw,user'srejectionandreconstructionsofaknowledgebase,arefirstintroduced,andthenaframeworkforextendedlogicprogramming(ELP)isgiven,whereanextendedlogicprogramisequivalenttoaknowledgebase.AtransitionsystemcalledR-calculusforELPisprovided.Foragivenknowledgebaseandauser'srejection,theR-calculusforELPwilldeducebestrevisionsofthebase.ThesoundnessandthecompletenessoftheR-calculusforELPareproved,andtheR-calculusforELPisimplementedinProlog.Inaddition,theresearchiscomparedwithotherrelevantwork.

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简介：Thedistortionofthearrayshapeisoneofthemainfactorswhichresulttheperformancedegenerationfromtheidealsituationoftowedlinearray(TLA).Basedontheordinaryarrayshapedistortion,thedirectivityfunctionofTLAispresentedinthispaper.Analgorithmforpreciselydetermningthecoordinatesofeachelementbymeansoftheinverseellipticfunctionisderived.Afastapproximationofrecursiveformulaforsolvingdistortedarrayshapeisgiven.Accordingtothecomparisonbetweenidealdirectivityandthedirectivityofdistortedarray,thecriterionformakingdecisionofoperationalmodeofTLAsonarispresented.SothattheperformancepredictionprobleminTLAissolved.Theresultsofsystemsimulationincomputershowagoodagreementwiththetheoreticalanalysis.

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简介：ThedistributionofmonthlymeanerrorofNMCmodelforecastsanditsseasonalvariationareinvesti-gated.Theratioofmonthlymeanerrortostandarddeviationisusedheretofindoutthattheregionwhereacorrectionofsystematicerrorisneededandappropriateismainlyinlowlatitudes.Theimprovement,afterthemodel’sverticalresolutionandsomephysicalparameterswerechangedfromApril1985,isinvestigated,andtheNMCoperationalmodelforecastshavealsocomparedwiththoseofECMWF.

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简介：在这份报纸，我们开发模型在金融限制和制造商能为贸易提供的零售商脸承认帮助零售商的条件下面决定供应链的运作、金融的决定。我们首先学习零售商是风险中立的盒子，并且导出最佳的订和金融决定。然后，零售商是风险反对的盒子(缺点风险)被学习，零售商和运作的制造商和金融决定上的风险的效果被讨论。最后，数字例子被提供进行经理的分析。