(;3(5,0(17$/&$53/$7(5(&2*1,7,216<67(0%< 1(85$/1(7:25.6$1',0$*(352&(66,1* 53DULVL(''L&ODXGLR*/XFDUHOOLDQG*2UODQGL ,1)2&20'SW8QLYHUVLW\RI5RPH³/D6DSLHQ]D´ 9LD(XGRVVLDQD ,5RPH,7$/< e-mail parisi@infocom.ing.uniroma1.it $%675$&7 ,QWKLVSDSHUDV\VWHPIRU,WDOLDQVW\OHFDUOLFHQVHSODWH UHFRJQLWLRQ LV GHVFULEHG EDVHG RQ WKH XVH RI JHQHUDO SXUSRVHIHHGIRUZDUGQHXUDOQHWZRUNVDQGEDVLFLPDJH SURFHVVLQJDOJRULWKPV7KHQHXUDOQHWZRUNUHSODFHVWKH HQWLUHSDWWHUQPDWFKLQJ PRGXOH HQFRXQWHUHG LQ VLPLODU V\VWHPV7KHDOJRULWKPDFWXDOO\GRHVQRWPDNHXVHRI ODUJH GDWDEDVHV DQG H[SHULPHQWV ZHUH FRQGXFWHG E\ WUDLQLQJWKHQHXUDOFODVVLILHURQDSXUHO\DUWLILFLDOWUDLQLQJ VHW1HYHUWKHOHVVILQDO UHVXOWV DUH VLPLODU WR WKRVH RI PRUH FRPSOLFDWHG DSSURDFKHV DQG FRXOG EH IXUWKHU LPSURYHG E\ RQ OLQH OHDUQLQJ 7KH XVH RI QHXUDO QHWZRUNVFRXSOHGZLWKWKHIDVW%5/6WUDLQLQJDOJRULWKP FDQVXEVWDQWLDOO\HQKDQFHWKHJOREDOUHFRJQLWLRQVSHHG ,1752'8&7,21 &DUOLFHQVHUHFRJQLWLRQLVLPSRUWDQWLQVHYHUDOILHOGVRI DSSOLFDWLRQ  WUDIILFFRQWUROLQUHVWULFWHGDUHDV  DXWRPDWLFSD\PHQWRIWROOVRQKLJKZD\VRUEULGJHV  JHQHUDOVHFXULW\V\VWHPVZKHUHYHUWKHUHLVWKHQHHG RILGHQWLI\LQJYHKLFOHV 6RPH DSSURDFKHV H[LVW DQG KDYH EHHQ GHVFULEHG LQ OLWHUDWXUH7KH\DUHPDLQO\EDVHGRQSDWWHUQPDWFKLQJ DQG QRUPDOL]HG FRUUHODWLRQ ZLWK D ODUJH GDWDEDVH RI VWRUHGWHPSODWHV ,QWKLVSDSHUZHGHVFULEHDQH[SHULPHQWDOV\VWHPIRU WKH UHFRJQLWLRQ RI ,WDOLDQVW\OH FDU OLFHQVH SODWHV 7KH V\VWHP LV EDVHG RQ WKH XVH RI D IHHGIRUZDUG QHXUDO QHWZRUN )11 WUDLQHG ZLWK WKH %ORFN 5HFXUVLYH /6 DOJRULWKP %5/6 GHVFULEHG LQ >@ 7KLV OHDUQLQJ DSSURDFK KDV EHHQ VKRZQ WR JXDUDQWHH KLJK UDWHV RI FRQYHUJHQFHDQGSURSHUWLHVRIVWDELOLW\DQGUREXVWQHVVRI WKHVROXWLRQ7KHGDWDDWKDQGFRQVLVWRIGLJLWL]HGLPDJHV RI FDUV DFTXLUHG E\ D KLJKUHVROXWLRQ  PP SKRWR FDPHUD DQG FROOHFWHG LQ D 3KRWR &' 7KH SURFHVVHG LPDJHV VHH )LJ DUH  E\  SL[HO ZLGH 7KH GLVWDQFHDQGWKHDQJOHRIYLHZVLPXODWHDFDUSDVVLQJ WKURXJKDWROOJDWH 7KHUHFRJQLWLRQSURFHVVVWDUWVZLWKWKHVHDUFKDQGWKH H[WUDFWLRQRIWKHSRUWLRQRIWKHRULJLQDOLPDJHFRQWDLQLQJ WKHFDUSODWH7KHFKDUDFWHUVFRQWDLQHGLQWKHSODWHDUH ORFDOL]HGE\DUREXVWSURFHVVLQJXVLQJDQRQWUDGLWLRQDO ')7 DQG VXEVHTXHQWO\ LVRODWHG DQG FODVVLILHG E\ WKH QHXUDO QHWZRUN 7KH VFRUHV DUH YDOLGDWHG E\ D SRVW SURFHVVRUZKLFKWDNHVLQWRDFFRXQWWKHV\QWD[RI,WDOLDQ VW\OHSODWHV 7KHQHXUDOQHWZRUNLVWUDLQHGRIIOLQHRQDVHWRIHUURU IUHHV\QWKHWLFFKDUDFWHUVZKHUHFRPSHWLQJDSSURDFKHV QHHG D ODUJH GDWDEDVH RI UHDOZRUOG LPDJHV WR H[WUDFW IHDWXUHV7KHIDVWWUDLQLQJFRQYHUJHQFHDQGWKHVXUIDFH HUURUPRGHODGRSWHGLQWKH%5/6DSSURDFKDOORZWRILQG UHOLDEO\ D ORFDO PLQLPXP LQ WKH PHDQ VTXDUHG HUURU 06(FRVWIXQFWLRQZLWKDKLJKJUDGHRIJHQHUDOL]DWLRQ FDSDELOLW\7KHRYHUDOOUHFRJQLWLRQUDWHRIWKHV\VWHPKDV EHHQ  WKH  RQ D YDOLGDWLRQ VHW RI ILIW\ UHDOZRUOG LPDJHVZLWKRIUHMHFWLRQUDWHDQGRQHIDOVH UHFRJQLWLRQ 7KH SHUFHQWDJH RI FRUUHFWO\ UHFRJQL]HG FKDUDFWHUV KDV UHDFKHG WKH  0RVW UHMHFWLRQV KDSSHQHGZLWKROGDQGGXVW\SODWHVDOPRVWXQUHDGDEOH DOVRE\KXPDQH\HV :LWK UHVSHFW WR D UHFHQWO\ SXEOLVKHG ZRUN >@ RXU DSSURDFKLVDEOHWRUHGXFHWKHFRPSOH[LW\RIWKHOHDUQLQJ SKDVH QR IHDWXUH H[WUDFWLRQ DQG SDWWHUQ PDWFKLQJ UHTXLUHGDQGRIWKHFKDUDFWHUUHFRJQLWLRQVSHHGHGXSE\ WKHSDUDOOHODUFKLWHFWXUHRIWKH)117KHDOJRULWKPKDV EHHQWHVWHGRQD3HQWLXP3UR3&0+]ZLWK0DWODE 7KHQH[WVWHSZLOOEHWRZULWHKDQGRSWLPL]HGURXWLQHVLQ D KLJKOHYHO ODQJXDJH VXFK DV & WR HQKDQFH WKH SURFHVVLQJVSHHG 287/,1(2)7+($/*25,7+0 7KHDOJRULWKPLVLPSOHPHQWHGDVDFDVFDGHRIEXLOGLQJ EORFNV(DFKRIWKHPUHDOL]HVDVSHFLDOL]HGWDVNLVIHGE\ WKH RXWSXW RI WKH SUHYLRXV VWDJH DQG PDNHV XVH RI UHODWLYHO\VWDQGDUGVLJQDOSURFHVVLQJWRROV