基于有限帶寬的VOD系統(tǒng)的解決方案.pdf

1、湖南大學(xué)碩士學(xué)位論文基于有限帶寬的VOD系統(tǒng)的解決方案姓名：黃偉申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：控制工程指導(dǎo)教師：謝冬青吳躍20051001基于有限帶寬的VOD系統(tǒng)的解決方案AbstractVOD(Videoondemand)isakindofteehnologywhichisusedtosearchmultimediainformationinbandwidthandreal—timeenvironmentMostofitissmall—sc

2、aleproductsandalittleproductslikeNCVBandIBMcanbetransplanttoMPPorcentralizedsupercomputersystemsThepitfallsofthiskindis：onlycanbeusedinspecialhardwares，costoftheseisveryhigh，mostoftheseisbasedoncentralizedenvironmentandb

3、roadcastcenterneedveryhighbackbonenetworkbandwidthWeproposedaNewdistributedtechnologywhichdesignasuperscaleVODthroughforsecastprogrameswhichwillbedemandedFirstlyweproposeadistributedVODmodel，whichiscomposedofprogramecent

4、er，ordercenteranddelegate，tosatisfytheapplicationdemandoflarge—scale，manyusersandmanyprogramesWereducethebandwidthofprimenetworkthroughmostusers’demandisaccomplishedinlocalandputordercentertoendofnetworkAtthesametimewere

5、ducememoryofthesystemthroughefficientprogramescachepolicieswhickonlycachehighfrequencyorderedprogramesAndthemodelcanbeflexibilyextenedSecondly，becauseordercenterneedtoservermanyuserandgenerallyexceedthecapabilityofserver

6、，SOhowtoco—operatewithdifferentseversandimplementload—balancebetweendifferentseversisveryimportantWepropsemanyCO—operatemethodsandparticularlyintroduceeverymethod’StheoryandcorrelationalalgorithmsThird，videoserversindiff

7、erentVODsystemsstoreandswitchprogramesintermofprogrames’orderfrequencyBecauseorderfrequencyischangedwithtime，SOswitchprogramesbasedonforecastcanoptimizecapabilityofthesystemWediscussforecastoforderfrequencyaboutprogrames

8、’storageandswitchofdistributedserversLastly：AccordingtotheVODprogramofHunanEconomicTVthemainresearchofthethesiswasverified，Throughcooperatingamongseveralservers，wecanrealizethebalanceloadingofthoseservers，Andtheresultofp