简介：Inthisdissertation,sereralkeyproblemsinthefieldofsteganographicimagesecurityaremainlystudiedanddiscussed:(1)Anovelkindofimagecryptosystemisstudied.Theencryptedinformationofsecretimageisembeddedintoanordinaryimage,whichcanbetransmittedpublicly,anditwillnotcauseattentionofillegaleavesdropper.Thefollowingresultsareachieved:(a)Theimagehidingalgorithmanditsimprovedalgorithmbasedonwavelettransformandvectorquantizationareproposed,andbothalgorithmsembedthesecretimageaftertakingfulladvantageofwavelettransform(WT)tocompressit.(b)IntroducingtheCDMAconceptincommunicationtheory,anovelkindofimagecryptosystem—imagehidingcryptosystemofimagedivisionmultipleaccessisproposed.Weencryptkeyinformationofseveralsecretimagesandthenhidethemintoanimage,whichisanordinaryimage.Afterreceiversgettheimage,eachreceivercanrestorecorrespondingsecretimageindependently.Comparedwithotherimageencryptionalgorithms,ournewimagehidingcryptosystemcancompresssecretimagedataefficiently.Moreover,thesecurityandpracticabilityofoursystemisbetter.(2)Digitalwatermarkingisthemostimportantbranchofinformationhiding,whichhasbeenthehotspotofinternationalacademia.Digitalwatermarkinghasbeenproposedasasolutiontotheproblemofcopyrightprotectionofmultimediadocumentsinnetworkedenvironments.Inthisfield,thefollowingresultsareachieved:(a)AnewfrequencyinformationhidingandwatermarkingalgorithmbasedonWTandDiscreteCosineTransform(DCT)ispresented.AftercompressedbyWT,theinformationofsecretimageisembeddedintoDCTdomain.ThealgorithmhasgoodimperceptibilityandsecurityandisrobustagainstJPEGcompressingandcropping.Thealgorithmcanbeusedtoembedwatermarkintoimages,andthewatermarkmaybeone256-colorpictureormoreandmorethanonesecretimagecanbehiddenintoasinglecarrierimage.(b)Anovelwatermarkingalg

简介：Thispapermainlydiscussesthe"double-trackcharge"system(priceprejudicechargesystem)intheoryandpractice.Theauthorexplainsandanalyzesthe"differentialchargesphenomenon"ofuniversitiesinChinabytaking"Paretooptimality"asregulationstandardand"Darwinoptimality"asempiricalstandard,combiningregulationstandardwithpracticestandard,realisticstandardofvaluejudgmentwithultimatestandard,andfairnesswithefficiency.Thispaperprovidestheoreticalreferenceandanoperationplatformforapplicationandimplementationdifferentialchargesandthecontainmentofcorruptionincollegeenrollment.

简介：Anin-depthexplorationhasbeenmadeoftelecommunicationtariffanditsdecisionsupportsystem.Itisthefirstattempttoconductsuchastudybytheintegrateduseofeconometrics,systememulationandsystemdynamics.Apractically-demandedcostmodelofthetelecommunicationtariffdecisionisproposed.Thesystemhasbeenverifiedwithrealdata.

简介：Thepricingoftelecommunicationservicesisquiteimportantaswellascomplicated.ThispaperstrengthenstheresearchoftheoriesandimplementationoftelecommunicationtariffinChina.Itishelpfulforthegovernmentauthoritiesandenterprisestounifyandstandardizetheregulatorymethods,toguidethedecidingofthestructureandleveloftelecommunicationtariffbyimplementingscientifictheories,tofurtherdevelopandoptimizethetariffsystem.Thispaperconductsasystematic,in-depthandcreativeresearchonsomeofthemostpopularandmostdifficultproblemsintheareaoftelecommunicationtariffresearch,suchastheregulationoftelecommunicationtariff,thetheoriesoftelecommunicationtariff,thesystematicpricingtheory,theinterconnectioncharge,themodelcostevaluationtheory,thelong-runincrementalcosttheory,andtheinternationaltelecommunicationtariff.Afterstudyingtheforeignmethodsontelecommunicationtariffregulation,basingonthecurrentsituationofChina'stariffregulation,thescopeandmethodsforChina'stelecommunicationtariffregulationaresuggested.Aimedattheweaknessofpricingtheoryforenterprisestosetuptelecommunicationtariffs,anoverallframeworkoftelecommunicationtarifftheoriesisproposed.Thesystematicpricingtheoryandmodelcostevaluationtheoryoftelecommunicationservicesareputforwardfromabrandnewperspective.Afronttopic,theLRICtheory,isprobed.Inaddition,thepricingpracticesofnetworkinterconnectionchargeandinternationaltelecommunicationtariff,whicharecurrentlyveryattractivetothetheorists,arediscussed.Basingonthesestudies,thispaperimprovesthestructureoftelecommunicationtarifftheory.ItprovidestheChinesegovernmentauthoritieswithpracticalmethodsandhelpfulsupportstoregulatethetelecommunicationtariffs;inthemeantime,italsoprovidestheenterpriseswithscientificpricingtheoriesandmethodstosetuptelecommunicationtariffs.Overall,thispaperhasnot

简介：Fromaneconomicangle,thispaperanalyzesanddemonstratestheirrationalityofthecurrentInternetsettlementofInterconnection;thenpointsoutthattheheavychargesforInternetinterconnectionfromdevelopingcountriestothedevelopedcountrycanbethoughtofasoneofthemainandkeyreasonsthatrestrictthebalanceddevelopmentoftheInternetintheworld,whichcausestheintensificationof'digitaldivide',widensthegapbetweenpoorandrichcountriesandfurtheraggravatesthedisequilibriumoftheglobaleconomicdevelopment;andthustheconclusionisreached:thepublicpolicyselectionshouldbemadebythewholeinternationalsocietyjointlyforpayingcloseattentionandregulatingsettlementsystemsofInternetinterconnectiontodwindle'digitaldivide'throughouttheworld.

简介：Inthisarticleabridgebetweentheexpectedcomplexityandperformanceofspheredecoding(SD)isbuilt.TheexpectedcomplexityofSDforinfinitelatticesistheninvestigated,whichnaturallyistheupper-boundofthoseforallthefinitelatticesifgivenbythesamechannelmatrixandsignalnoiseratio(SNR).SuchexpectedcomplexityisanimportantcharacterizationofSDinmulti-antennasystems,becausenomatterwhatmodulationschemeisusedinpractice(generallyithasfiniteconstellationsize)thisupper-boundholds.AbovebridgealsoleadstoanewmethodofdeterminingtheradiusforSD.Thenumericalresultsshowboththerealvalueandupper-boundofaveragesearchednumberofcandidatesinSDfor16-QAMmodulatedsystemusingtheproposedsphereradiusdeterminingmethod.MostimportantofallnewunderstandingsofexpectedcomplexityofSDaregivenbasedonabovementionedtheoreticanalysisandnumericalresults.

简介：Accuratetimedelayestimationisveryimportantinmultichannelnoisesuppressionsystems.Thispaperhasproposedanewmethodtoreducetheeffectofnoiseontheestimationoftimedelaybetweendifferentchannels.Ournewtimedelayalgorithmwillmoreconsiderablyreducetheestimationerror,comparedwiththeconventionalautocorrelationfunctionmethod.

简介：Thearticlestudiestheinternationalfinancialservice,whichmightbeopenedbyChinaPost.Basedondefiningpostalfinancialservice,itanalysestheface-to-facecircumstancesandchallengesbyusingthemethodofnormalmarketpositionandthemethodofGeneralElectricCompany(GEC).FinallyitdefinesthemarketpositionofPostalFinancialInternationalService(PFIS).

简介：EncryptedCommunicationtechniqueisanimportantmeasuretotheinformationsafety.BasedontheadvantagesoftwopublicencryptionalgorithmRSA&DES,anovelhighintensitypublicencryptionalgorithmChaosRandomHighIntensity(CHR)isproposedinthispaper.TheprincipleofCRHisdescribedandanalyzedindetail,andtheresultsofcomputersimulationhasproveditseffectivenessandcorrectness.

简介：Theneuralnetworkforsolvingquadraticprogrammingproblemisfurtherinvestigated,andtheavailablestabletestingconditionofthismethodispurposed.Weprovethatthenetwork,underproposedcon-dition,hasabehavioroftheglobalconvergence.Finally,numericalsimulationexamplesaregiven.

简介：Thedissertationstudiesthearchitectureofbroadbandintelligentnetwork(BIN)andimplementationofvideoconferencebasedonATMnetworkandofmulticastroutingproblemonvideoconferenceusingBINundertheaidoftheimportanttask-StudyofINandB-ISDNIntegration(69896244)-sponsoredbyNationalNaturalScienceFund.Alotofpointsofviewandsolutionsarepresent.Themaincontributionsinthedissertationareasfollows:(1)DesignthenewarchitectureofBINandimprovethearchitectureofBINproposedbyITU-T.ItiseasytosetuptheconnectionsofvideoconferenceusingthenewarchitectureofBIN.(2)PresentthedetailedschemethatBINcontrolsandimplementsvideoconferencewithoutspecializedresourcefunction,studytheschemeofallthemediaonvideoconferencetransmittedandswitchedunderthecontrolofBIN,anddiscusshowtoimplementpoint-to-multipointcommunicationsusingBIN.(3)FirstpresenttheschemeofimplementingmulticastroutingalgorithmsonvideoconferenceusingBIN.(4)Explicitlyintroduceaseriesofconceptsincludingneighboringnode,neighboringnodeset,neighboringedge,thenproposeanAdjustableDynamicMulticast(ADM)routingalgorithmwhichissuitableforvideoconference,analyzeitsperformances,andprovethealgorithmisappropriateandfeasible.(5)Developadegree-constraineddynamicmulticast(DADM)routingalgorithmwhichcanfindlesscostmulticastroutingtree.TheresultsofsimulationandexperimentsconfirmthatDADMalgorithmcanfindthelesscostmulticasttree.Finally,analyzetherelationbetweenthesizeofdegree-constrainedandvalueofmulticasttreecost.(6)Presentadelay-constraineddynamicmulticastroutingalgorithmsuitableforvideoconferencecharacteristic,andadviseaseriesofschemesreducingthedelayoftransmittingallthemediaonvideoconference.(7)FirstproposeimplementingthereliablemulticastroutingtransportprotocolusingBIN,therebyACKimplosionproblemcanbesolved.Theprotocolonlyrequiresfin

简介：AMultimediastreamsdynamicratecontrolalgorithmbasedonFuzzyadaptivePID(MFPID)hasbeenproposedtoimplementmultimediastreams'endsendingrateon-lineself-regulatingandsmoothing,andtotracksystemresourcesintime,sothatitcanavoidsystem'sregulatingoscillationandguaranteesystem'sstability.And,someworkhasbeendonetoanalyzeadaptivesessionmodelofmultimediastreams,toimplementfutureavailablebandwidthestimationofIPnetwork,toachievePIDparameters'on-lineself-tuningbyfuzzycontrolling.SimulationvalidatedthetheoreticalresultsofMFPID.

简介：服务(QoS)的A~*梅脯质量路由算法被建议计算K短路径令人满意的多重QoS限制。因为它的灵活性，A~*梅脯在处理许多实际限制被认为是为聪明的光网络的实际路由算法之一。这篇文章通过广泛的模拟实验给算法的详细表演研究。我们发现那运行时间和算法的存储器空间要求大，特别当网络尺寸增加时。Inthis文章，我们也建议一条途径到改进A~*梅脯算法的表演。改进应该在聪明的光网络为实际使用使A~*梅脯算法更吸引人。

简介：Areformingdynamicsystembasedonthesingle-ringerbium-dopedfiberlaserisproposedinthispaper.ThereformingsystemhaslargerLyapunovexponentandbetterpseudorandomcharacteristicsaccordingtothesimulationresults.Itispromisingintheapplicationoftheimageencryptionandsecretcommunication.