Basic Theory of Solutions of a Class of Nonlinear Singular Systems with Delay

1.INTSODUCTIONOnindex-1noallnearsingularsystemswithoutdelay,thelocalekistenceanduniquenessofsolutionshasbeendiscussedinthereference[2].Onglobalekistenceanduniquenessofsolutionsofindex-1systemsandofhighindexsystems,therehasbeennotmuchdiscussion.Onthebasictheoryofnonlinearsingularsystemswithdelay'therearefewresults.Itisdndculttodiscusstheekistenceanduniquenessofsolutionsoftheirinitialvalueproblems.Singularsystemscanbetransformedilltodifferelltialalgebraicequations.Andnonlinearalgebraicequa…     

A Class of Real-Time Parallel Combined Methods ofDigital Simulation for Large Systems

1.INTRODUCTIONInreal-timesimu1ation,apartofasystemisreplacedbymathematicalmodel,whichmustbesolvednumericallyatexactlythesamespeedasthepartreplacedtorealistiCallysimulatethereplacedpaJrt.SupposethatthesystemconsistsofprocessAandprocessB,andtheprocessAofthesystemissimulatedbyadigitalcomputer.Simi1arly,wecanconsiderasystemforincludingseveralprocesses.ThepartAofthesystemtobesimulatedisassumedtobemodeledbyasystemofastiffordinarydtherentialequations,andthisequationsystemisintegratednumericall…     

A Slip-Line Method for Calculating Extrusion Force of Steel Helmet with Cold Extrusion Moulding

1.TEEPLASTICDEFO~Af1ONOFSTEELELLIPSETHINPLMESteelhelmetwithcoldextrusionmouldingisdesignedaccordingtothestandardGB2428(wherethestandardheadsizeofapadultmanisgiven).Accordingtothestandardheadsizeoftheadultman,theconcaveandconvexmodelofsteelhelmetwithcoldextrusionmouldingisdesigned.Theconvexmodelisatensilemodelwithcomplexparabolashape.Thesteelthinplateedgemustbepressedundertwo-wayhydraulicpress.ThesimplifiedcalculatingmodelisshowninFig.1.Theedgeissimplifiedasfixedellipseboundar…     

BEHAVIOR OF STOCHASTIC APPROXIMATIONALGORITHM IN ROOT SET OF REGRESSIONFUNCTION

1.IntroductionStochasticapproximation(SA)iswidelyappliedinoptimization,systemindelltification,adaptivecontrolandsignalprocessing.ThebasicproblemofSAistoseektherootsoreXtremaofafunctionf(.)calledregressionfunctionwhichcanbeestimateattimekandletthe(k 1)thobservationi,e,Yk 1~f(Xk) ek 1,(1)whereek 1istheobservationnoise.RobbinsandMonroll]in1951proposedthefollowingalgorithmxk l=xk akyk 1,(2)toestimatetherootsofj(.),whereahisthestepsize.ThisalgorithmisnowcalledRobbinsMonro(RM)algorithm.Denoteb…     

The Entropy of System Decreases with the Deflection from the Equiprobability Distribution

1　IntroductionEntropy,asameasurementthatdescribestheuncertaintyofsubsystemsdistributioninasystem,hasdevelopedunceasingly.First,R.J.E.Clausiusintroduceditintothermodynamics,asastatefunction,todescribetheauto-evolutionabilityofthestate.Thedifferenceofentropybetweenthetwostatesequalstothequantityofheatabsorbedbythesysteminanisothermalprocess,thatisS2-S1=∫21dQT(1)　　L.E.Boltzmannconnecteditwiththeuncertaintyofsubsystemsdistributioninathermodynamicalsystem.Theentropyofathermodynamicalsystem…     

AN INVESTIGATION OF THE POLYNOMIAL FORFORWARD ANALYSIS OF A FLORIDA PLATFORM

1.IntroductionInthisreportwewillpresentsomecomputationalresultsforthekinematicsolutionofanin-parallelmechanismplatformdesignedattheUniversityofFlorida.Thefigureoftheplatformanalysedhereisasfollows.Figure1Theconnectingpointsjoinvenicestosidesofthepairoftriangles.Thisisaspecialcaseofwhatwehaveconsideredin[l].Sincebothofthefixedandmovingplatformsaretriangles,andsomejointcenterslieonthecorrespondingsidesofthem,wecanspecifysomeparametersin[1]foranalysis.Itturnsoutthatmorecomputationalresultscanbe…     

Artificial Neural Networks Model of Evaluating the Schemes of Mine Design

1　IntroductionTheevaluationandoptimalselectionofminedesignschemesarealwaysanimportantandcomplicatedworkofdesigningdepartments.Accordingtoparticulargeologicalconditions,severaldesignschemesareanalyzedandcomparedcomprehensivelyintechnology,econo-my,safetyandetc.Thenanevaluationconclusionwillbereached.Therefore,itisamul-tiplecriteriadecisionmaking.Thereareseveralmethods[1～4]atpresenttoevaluateminedesignschemes.Theirtwocommondefectsareasfollows:1Astheevaluationofminedesignschemesisamul-ti-inde…     

Reliability Optimization Design for the Safe-Arming System of an Air-Faced Missile

1.INTRoDUCT1ONThesafe-armingsystemofanair-facedmissileisakeydeviceforensuringthesafetyofmissileatordinarytimesandthehittingreliabilityofmissiletotarget.Thus,thereliabilityoptimizationdesignforthesafe-armingsystembecomessignfficallt.Thereference[2]discussesthesafetyofvariouskindsofs/asystemsunderservicetreatment.InfaCt,thes/asystemisordinari1ydesignedtoanorderedsafe-armingconfigurationwithredundancyforthesakeofsafety[1].Withoutthelossofgenerality,thepaperonlydiscussesthereliabilityoptimiza…     

SOLITON AND ELLIPTICAL PERIODIC SOLUTIONS TO THE MODIFIED NONLINEAR SCHRODINGER EQUATION

1.IntroductionAsiswellknown,theNLSE.02 ac Iql:q=0(1)'N Zap Iql:q=0(1)describesthepropagationofpicosecondOPticalpulseinamonomodeOPticalfiber,whereq(',T)istocomplexpulse,'represelltsthedistancealongthedirectionofpropagation,Trepresentsthetimeinthegroupvelocityframeandrs=11.TheNLSEhasbrightsolitonsolutionwhend==1,anddarksolitonsolutionwhena=11.Inthisnotewehaveobtainedthedarksolitonsolutionwhena~1.However,recentworkshaveshownthattheNLSEisnotsufficieDttodescribethepropagationoffemtosecond…     

MARKOV FUZZY CRITERION DECISION MODELS

1.IlltroductionMarkovdecisionmodels(MDMforshort)havebeenextensivelystudiedandagreatmanyresu1tshavebeenobtainedsincel95O's(e.g.,see[1-6]).Alltheseworks,asfarasweknow,arebasedonthefactthattheoptimalityindexesareab1etobemeaJsuredaccurately.However,inthepracticalproblem,thereasonableandaccurateindexesdonotalwaysexist,andevenso5theirvaluesarenoteasytoacquiresometimes.ThisfactlimitstheapplicationofMDMtosomeextent.FuIthermore,forcomplicatedmodelswithmultipleindexesitmaybedifficulttofindanoptimals…     

HARMONIC MAPS VERSUS POISSON EQUATIONS ON NONCOMPACT RIEMANNIAN MANIFOLDS

1.Introducti0llStartingfromtheworkofP.LiandT.F.Taml1'2])therearesomeprogressonthestudyofharmonicmaPsbetweennegativelycurvedc0mplete,noncompactriemannianmanifolds.Wemayquote[2-5]justforafew.Thenewstartingpoilltin[1]isthea-ssumption0fagivenmaPwithitstensi0nfieldinasuitableSob0levspace.Asacomparison,wementi0nthatthekeytechniqueofthemethod0fEells-Sampsonl6]istheuseofaBochnertypeevoluti0n0ftheenergydensitywithaninitialdataoftotalenergy.InthispaPer,wetrytogivealargec1assofapprokimateharmonicma…     

Study on Method of Comprehensive Evaluating for Information System Projects

1.INTRODUCTIONHumansocietywillgetintoinformationtime,accompaniedwithding-dongofthenewcentury.Aninformationtechnicalrevolutionissweepingovertheworld.ItisoneoftheprincipalforcesbehindtheraPidchangesofconstructionofeconoInymanagemelltofproduction,andpatternofliving.Itisakeylinkofinformationsocietiesthatinformationsystemsarebui1t.Therequestsofevauatingioformationsystemprojectsareadvancedbecauseagreatdealinformationsystemswelledup.Informationsystemprojectshavealotofparticularcharacterscompare…     

Characteristic Properties of Perspective Sets for Finite Stochastic Decision

1.INTRODUCTIONConsequenceswilloccuruncertainlyilldecisionwithprobability,becallseoftheuncertainticofstates.Naturallyweshouldcollsidertheuncertaillt}'whelltheutilityofcollsequen"esis'liscussed.1\reindicatetilesetofally{CI.CZ.''.C,,}withtilecorrespondillgsetI)ofprobabilities{pl,p2,''.p,,}sucllthat'Epi=1.SettingP=(pl.CI;I)2.C2;'':p,,.C,,),]=[wecallPasaperspective.ThesetofallPerspectivederivedby'{CI.C2,'',C,,}isilldicatedby9,thatis,RatiollalBehaviorAxiomsassureth…     

D-SThBILITY TESTING FOR THE INTERVALMATRIX FAMILY

*ThisresearchissupportedbytheNationalNaturalScienceFoundationofChina.1.IntroductionConsiderarealintervalmatrixfamilydefinedbyA={A=(qij),,..,Iqij5qij5q;,fori,j=1,2,'',n}(l.1)whichisasuperrectangleinlynxswithdimensionnxn.ForanyACA,leta(A)denotethesetoftheeigenvaluesofA.Definition1GivenanyopenandconnectedregionDinthecomplexplaneC,whichissymmetricabouttherealaxis.AissaidtobeD-stableifforeachAEA,a(A)CD.SincethepublicationofKharitonovTheorem[1],aconsiderableportionofresearchhasbeenaimeda…     

ASYMPTOTIC SIMILARITY OF INFINITE-DIMENSIONAL LINEAR SYSTEMS AND APPLICATIONS TO STABILITY

1.IntroductionInfinite-dimensionallinearsystemstheory,itiseasytoverifythatthespectrumandtheexponentialgroWthboundarepreservedunderasimilaritytransformation.ThispropertyisaIsosatisfiedfortheinfinite-dimensionalcaseifthesimilarityoperatorisboundedandbound-edlyinvertible.Inthisnote,weilltroduceageneralizationoftheconceptofsimilaritycalledasymptoticsimila-rityforindnite-dimensionallinearsystems.Inthefinite-dimensionalcase1similarityandasymptoticsimilarityareequivalellt.Weshowthatthisasymptoticsi…     

FURTHER RESULTS ON THE ASYMPTOTIC BEHAVIOUR OF MINIMUM AVERAGE HAMMING DISTANCE FOR BINARY CODES

1.IntroductionLetFZnbethen-dimensionalvectorspaceoverthebinaryfieldF2.Anon-emptysubsetACFZniscalledacode.TheaverageHa~ngdistanceofacodeAisdefinedby1\d(A)=IAIz,ZZdH(x,y)ahApeAwhereIAIisthenUmberofcodewordsinA,dH(x,y)istheHammingdistancebetweenxandy.ForallaE{1,2,'',2"}andn21,wedefinetheminimumaverageHammingdistanceasda(a)=^.gle^l=.d(A).AlilswedeandAlthofer[1]provedthefollowingtheorem.Theorem1illLetan(15anS2"),n=1,2,'',beasequenceOjpositiveintegers.Ijforsomeconstanto(0相似文献   

Fast and Robust Control of Excitation Systems: A Finite-time Method

1　 IntroductionExcitation control plays a very importantrole in the security operation of power systems.It has drawn a greatdeal of attention and many contributions have been made( Bittanti etal.1 996;Lahdhiri et al.1 997;Lu et al.1 989,1 996;Mak,1 992 ;Savaresi et al.1 997;Chapman etal.1 992 ) . This paper proposes a new design method of finite-time excitationcontrol of the following widely used 5th-order model of synchronous generators ( Savaresietal.1 997;Brasca etal.1 993,1 994 ;Bitta…     

NEURAL NETWORK MODELS FOR DESIGN OF BLOCK CIPHER SYSTEM

1.Introduction.Weallknowthattheneuralnetworkmodelandtheciphersystemarebothimportantinthefieldofinformationprocessing.Thispaperwilltellyouhowtoestablishakindofrelationshipbetweenthem.ThetraditionalHopfieldNeuralNetworkisadynamicsystemwithNconnectedneurons,andthestateofeachneuroniseither lor--1.Letyi(t)bethestateoftheithneuronattimet.Thenthestateofthewholenetworkcanbedenotedasavectorv(t)=(yi(t),yi(t),''IVN(t)).Atthenexttime,thestateoftheithneuroniscomputedbywheresgn(u)~--1whenu<0andsgn(u)~1…     

ON THE ONE-SIDED LOGARITHMIC LAW FOR ARRAYS

1.IntroductionLet{X.,n2l}beasequenceofindependentandidenticallydistributed(i.i.d.)randomvariables.TheHartmanandWintner,sllllawoftheiteratedlogarithmstatesthatifEXI~0andEX7=1Moreover,itisprovedin[2]and[3]that(1)holdsifandonlyifEXI~0andEX7=1.Nowlet{Xnk,k=1,2,''tntn~1,2,'.}beanarrayofi.i.d.randomvariables.FOreveryn21setS.~Z:--,X.k'ThealmostsureconvergenceofSahasbeenstlldiedbyHu,MoriczandTaylor[41,HuandWeb.rls]andQi[6].HuandWeber[5]showedundertheconditionsEXll=0,EX7,=1andEXt,相似文献   

A New Signal Processing Technique of π/4-DQPSK Modem Based on Software Radio

1 .INTRODUCTIONπ/4 DQPSKmodemhasbeenchosenasthemodemschemeinmanymobilecommunicationsystems[1 ] .Inπ/4 DQPSKmodem ,theinformationbitsaremappedintophasetransitionsratherthanabsolutephasevalues.Thisencodingofinformationinthetransitionsovercomesthephaseambiguityproblemsresultingfromtheestimationofcarrierphaseinnon differentialPSKsystems.Soπ/4 DQPSKallowsforsimplebasebanddifferentialdemodulation .Further,inπ/4 DQPSK ,themaximumphaseshiftisrestrict edto± 1 35°(ascomparedto± 1 80…