简介:VoIP(VoiceoverIP)isarapidlygrowingareawithgreatmarketpotential.Topromoteitforbothcommericalandresearchpurposes,aprototypeVoIPsystembasedonstate-of-the-artotorolacommunicationtechniqueshasbeendeveloped.ItisagatewaysystemintegratingaPBXandaVoIPmodule.AllcomponentsthatH.323definestosupprotVoIPareimplementedintheVoIPmodule,thoughinasimplifiedmanner,Asanembeddedsystem,thesystemfeaturesrealtimenessandtaskdistributiveness.Anumberofaddiitonaltechniquesareusedtoimprovetheperformance,includingnoisesuppression,zerocopy,andbufferstructureoptimization.Whenrefinedininteroperability,thesystemwillalsoreadilyserveasaproduct.
简介:ThedevelopmentofInternetprovidesconvenientenvironmentforinformationsearchingandbrowsing.Italsoofferssanewplatformforgeographicinformationprocessingandanalysis.ThispaperdiscussesorganizationandprocessingapproachtoInternetgeographicinformation,andprovidesanewmethodtocross-platformanddistributedgeographicinformationanditssoftwareimplementation.Theexampieisusedtoshowthepracticalityandsuperiorityofthismethod
简介:Inthefirstpartofthepresentpaperwehaveexplainedwhywemanagetoformulateanotherwavepredictionmodelwhensomanyofthem,includingtheso-calledthirdgenerationmodel,havealreadybeeninuse.Thewind-wavepartoftheproposedmodelhasalsobeengiven.Nowweproceedtodiscusstheswellpart,theimplementationofthemodelasapredictionmethod,mumericalexperimentsdonewithidealwindfieldsandhindcastsmadeintheBohaiSea,intheneighboringseasadjacenttoChinaandintheNorthwestPacific.
简介:TheGAMMAparadigmisrecentlyproposedbyBanatreandMetayertodescribethesystematicconstructionofparallelprogramswithoutintroducingartificialsequentiality.ThispaperpresentstwosynchronousexecutionmodelsforGAMMAanddiscusseshowtoimplementthemonMasParMP-1,amassivelydataparallelcomputer.TheresultsshowthatGAMMAparadigncanbeimplementedverynaturallyondataparallelmachines,andveryhighlevellanguage,suchasGAMMAinwhichparallelismisleftimplicit,issuitableforspecifyingmassivelyparallelapplications.
简介:Thispaperpresentstheworkingprocedureofpowergeneratingenterprisesandexplainstheframeworkofane-power-plantanditsinformationsystem,putsforwardtheguidelineandthegeneralgoalofinformatizationconstructionwhilefocusingontheconstructiongoalintheappliedsystem,theimplementingstrategy,theprojectmanagementandorganization.
简介:ANEFFICINTIMPLEMENTATIONOFMERRILL'SMETHODYANGBing(DepartmentofManagementEngineeringHarbinEngineeringUniversityHarbin150001)Ab...
简介:Withtherapidgrowthoftheinternet,thefastinformationcommunicationandthecomprehensiveinformationpublicationbecomeavailable.Toattracttheattentionofbrowsersandletbrowsersknowthehotnewsintime,awebsiteisrequiredtoupdateitscontentconstantly.Thetraditionalmodetomanuallyupdatewebsiteisnolongersuitablefortherapidgrowthofwebsitecontents.Moreover,
简介:TheATLASdetectorisoneofthemostsophisticatedandhugedetectorseverdesigneduptonow.Adetailed,flexibleandcompletesimulationprogramisneededinordertostudythecharacteristicsandpossibleproblemsofsuchachallengingapparatusandtoanswertoallraisingquestionsintermsofphysics,designoptimization,etc.TocopewiththeseneedsweareimplementinganapplicationbasedonthesimulationframeworkFADS/Goofy(FrameworkforATLASDetectorSimulation/Geant4-basedObject-OrientedFolly)intheGeant4environment.Theuser'sspecificcodeimplementationispresentedindetalilsforthedifferentapplicationsimplementeduntilnow,fromthevariouscomponentsoftheATLASspectrometertopsomeparticulartestbeamfacilities,particularemphasisisputindescribingthesimulationoftheMuonSpectrometeranditssubsystemsasatestcasefortheimplementationofthewholedetectorsimulationprogram:theintrinsiccomplexityinthegeometrydescriptionoftheMuonSystemisoneofthemoredemandingproblemsthatarefaced.Themagneticfieldhandling,thephysicsimpactintheeventprocessinginpresenceofbackgroundsfromdifferentsourcesandtheimplementationofdifferentpossiblegenerators(includingPythia)arealsodiscussed.
简介:ThispaperintroducesaheterogeneousdistributeddatabasesystemcalledLSZsystem,whereLSZisanabbreviationofLiShizhen,anancientChinesemedicalscientist.LSZsystemadoptsclusterasdistributeddatabasenode(orsite).Eachclusterconsistsofoneofseveralmicrocomputersandoneserver.Tepaperdescribesitsbasicarchitectureandtheprototypeimplementation,whichincludesqueryprocessingandoptimization,transactionmanageranddatalanguagetranslation.ThesystemprovidesauniformretrieveandupdateuserinterfacethroughglobalrelationaldatalanguageGRDL.
简介:ManyInternet-GIShavebeenimplementedonthewebandtheyareincreasinglybecominganimportantpartofmultimediacartographythathasmuchmoreusersascomparedtotraditionalGISproductionmedia.InternetGIStechnologyhasprovidedtheGISdynamicinformationacquisitionwithtechnicalsupport.Also,thevisualizationtechnologyofelectronicmaphasprovidedtoolsforGISsymbolswithdynamiccharacteristics.OnthebasisofGISdynamicinformationacquisition,thedesignideaandimplementationmethodsofdynamicsymbolsindynamicGISarepresentedinthisarticle.
简介:为概括的逆的一般限制代表的计算和实现调查三个各种各样的算法。介绍和preliminaries;概括嵌入方法的细节;限制表示和直角的系统。
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简介:Inthestrapdowninertialnavigationsystem,theFiberOpticalGyro(FOG)musthavehighprecisiontogiveaccuratenavigationinformation.Inthispaper,adigitalclosedloopdetectionmethodbasedontherampwavemodulatingtechnigueisintroduced.DSPandFPGAhavemanyadvantagesindigitalsignalprocessing.Inthedesign,byusingDSP,acomplexarithmeticoperationiscompletedtomeettheneedsofclosedloopcontrolofFOGwithinashorttime.AllkindsofcontrolsignalsareproducedeasilybyFPGA,underwhichDSPcouldworkproperly.CombiningtheDSPandFPGA,thedetectingmethodisimplementedsuccessfully.Intheend,theresultoftestandperformanceisgiven.FromtheresultwecanconcludethattheprecisionofFOGisimprovedandthenoisesarelimitedtoalowlevel.
简介:Thetrafficbufferingproblemsintheethernetoversynchronousdigitalhierarchy(EOS)areintroducedandanalyzed.Differentsolutionsarealsopresentedindetail.SynchronousDRAM(SDRAM)isusedasoff-chipbuffertostore-and-retransmissionethernetframes.Anewandeasycontroldesignisintroducedhere.Thebufferareasizeonchipisgreatlyreducedandthepowerdissipationislowedatthesametime.