Quality-Aware Replication of Multimedia Data
نویسندگان
چکیده
QII(lJiry-all"G1"C lIIul/imedill .j"ys/ems (Il/apr lllelfia /fUlISlIIi.~sion /() 11~'er QoS requin'lIIclll.'i. SIIC"!J a(/ap/alioll is generally performed lJy mll/scadillg origiual (high-qualify) 11/('dia imo l/ulIlitY-/'{'fCrogcllcous copies (replicas). As II/cdia rraJ/scadillg is e.H(emely expclIsil"C ill terllls oj CPU ros/, the slra/egy oJ.utl/ic ad(lpwrioll by which /7!pficlI.\" {/I"(' prcellcoded aud stored il/ disk Ims bel'l/ widely e.\p!oi/ed. Holl'{'l"el; rhe proNclII oJ sefecril/g which replicas 10 .wore frOIll the lmge /IIIII/ber of ClII/di/klte.l" Iras //01 been .I'll/died. \Ve \'iell' Ihis a.l" (I daTa replicll/ion prohlelll ill a dnl/al quality space. III 'his pape/: we gire (lIeuri.l'lic) ~"OIII/ions 10 rhis NP-colllpleu: problelll IIl1der tll'O differem ~'y~'fC1II IIlOdels. For a system tl/{/r 011,-'cl/lerUlills hard qualil.l' reqlliremellts. JrC fOr/mllll/e Ille pmh/clJI illfo a 0-1 Kllapsack ami plvpose {/II c!fidellt SOllllioll 111m millimi;:.es reqllesr blocking pmlmbili/y, Morc imeresting is a soji {/llalilY-(II\'{/re systemll'!Ierc users (Ire willillg ro negorime Iileir QoS IIC'e(k All imponom optimizarirJl! goal i,\'1V lIIillillli;:.e IItility 10.1'.1" ill slIcil syslellls. We propose a ptlll'elf"l algorithm, tile Itemtire Greedyalgorithm, ro ,wIre ,his optimi:mion. 11'lIiell i.l' fOl/lld ro be a rariarioll of the k-IIIl'dillll problem, E.rtensil·e simulations sholl' Illar o/lr algorilllm perfoflll~' sigllijicamly beller t"{1II OIlier widely-llsed hellrislies. Mosl of t"c resllits gil'en lJy rhe Itemlh'c Greedy algorilhm are \'cr1.' close ro the op/imall'llillc. lilli/allY cases. it finds lhe oplilllal soluriol/.
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