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ೖ໳26*$ খ໺ً໵

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index w26*$ͱ͸ w26*$ͷϞνϕʔγϣϯ 5$1ͷෆຬ఺ 26*$ͷΰʔϧ )P-ϒϩοΩϯάʹ͍ͭͯ w26*$ͷৄࡉ w26*$ͷ՝୊ͱ͜Ε͔Β 2

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index w26*$ͱ͸ w26*$ͷϞνϕʔγϣϯ 5$1ͷෆຬ఺ 26*$ͷΰʔϧ )P-ϒϩοΩϯάʹ͍ͭͯ w26*$ͷৄࡉ w26*$ͷ՝୊ͱ͜Ε͔Β 3

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QUICͱ͸ʢ1/2ʣ wτϥϯεϙʔτϓϩτίϧͷͭ ʮ͍ͬ͘͘ʯ ུޠͰ͸ͳ͍ 6%1ͷ্Ͱಈ࡞ ίωΫγϣϯܕͷϓϩτίϧ 5$15-4૬౰ͷػೳΛ࣋ͭ ओʹ8FCͰར༻͞ΕΔ 4 ग़య<>

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QUICͱ͸ʢ2/2ʣ w੒Γཱͪͱݱঢ় (PPHMF͕೥ʹൃද H26*$ ͦͷޙ*&5'8PSLJOHHSPVQ͕ൃ଍ɽඪ४Խ΁ʢJ26*$ʣ H26*$͸$ISPNFͱ(PPHMFαʔόؒͷ൒෼Ҏ্ͷίωΫγϣϯͰ ར༻͞Ε͍ͯΔɽ J26*$͸υϥϑτͷWFSTJPO͕ ࠷৽ w େ࿮͸ܾ·͍ͬͯͯɼࡉ͔ͳमਖ਼͕ଓ͍͍ͯΔ 5 ग़యɿ IUUQTUPPMTJFUGPSHIUNMESBGUJFUGRVJDUSBOTQPSU

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index w26*$ͱ͸ w26*$ͷϞνϕʔγϣϯ 5$1ͷෆຬ఺ 26*$ͷΰʔϧ )P-ϒϩοΩϯάʹ͍ͭͯ w26*$ͷৄࡉ w26*$ͷ՝୊ͱ͜Ε͔Β 6

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QUICͷϞνϕʔγϣϯ w8FCΞϓϦέʔγϣϯʹର͢Δཁٻͷଟ༷Խ ஗Ԇཁٻ͕ݫ͍͠ ҉߸Խ wར༻Ͱ͖Δϓϩτίϧ 5$15-4 w ෆຬ఺͕৭ʑ͋ͬͨʢޙड़ʣ 7 5$15-4ʹมΘΔ৽ͨͳϓϩτίϧΛ࡞Γɼ8FCͰ࢖͓͏ʂ

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TCPʹର͢Δෆຬ఺ʢ1/2ʣ wϓϩτίϧมߋʹ൐͏ࠔ೉ ϛυϧϘοΫεʹΑΔӨڹΛड͚Δ w ະରԠͷϑΝΠΞ΢Υʔϧʹःஅ͞ΕΔ͔΋ w /"5ʢ/FUXPSL"EESFTT5SBOTMBUJPOʣ΁ͷαϙʔτ͕ඞཁ͔΋ wߋ৽ʹ൐͏ࠔ೉ 5$1ͩͱΞοϓσʔτͷࡍɼ04Χʔωϧ͝ͱΞοϓσʔτ͢Δඞ ཁ͕͋Δ 8

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TCPʹର͢Δෆຬ఺ʢ2/2ʣ wϋϯυγΣΠΫʹ͔͔Δ஗Ԇ 5$1IBOETIBLF 355 5-4IBOETIBLF 355 w 5-4ʹ͸355Έ͍ͨͳͷ͕͋Δ͚Ͳ w)FBEPG-JOFϒϩοΩϯά ͋Δύέοτ͕ԿΒ͔ͷཧ༝Ͱಧ͔ͳ͍ͱ͖ɼޙଓͷύέοτ͕ ଴ͨ͞ΕΔݱ৅ 5$1Ͱ͸ύέοτϩε࣌ʹൃੜ͠ɼ௨৴඼࣭௿Լʹܨ͕Δ w zύέοτz͸ɼ5$1ηάϝϯτɼ)551ϝοηʔδͳͲ w ৄ͘͠͸ޙड़ 9 ग़య IUUQTIQCODPUSBOTQPSUMBZFSTFDVSJUZUMTUMTIBOETIBLF 'JHVSF

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QUICͷΰʔϧ wσϓϩΠ͕؆୯ ϛυϧϘοΫε͔Βड͚ΔӨڹΛ࠷খݶʹ͍ͨ͠ wߋ৽͕؆୯ 04ΧʔωϧͷΞοϓσʔτແ͠ͰɼϓϩτίϧͷΞοϓσʔτΛ ߦ͍͍ͨ wϋϯυγΣΠΫͷ஗Ԇ͕খ͍͞ w)P-ϒϩοΩϯάͷӨڹΛड͚ͮΒ͍ 10

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ΰʔϧ1ɿσϓϩΠ͕؆୯ w6%1্Ͱಈ࡞ͤ͞Δ ϢʔβʔۭؒͰಈ࡞͢Δʢ5$1 6%1͸ҰൠతʹΧʔωϧۭؒʣ ϓϩτίϧͷΞοϓάϨʔυʹ൐͏04ͷΞοϓάϨʔυ͸ඞཁͳ ͍ ߴ଎ͳ։ൃαΠΫϧΛճ͢͜ͱ͕Մೳ wϔομͷେ෦෼Λ҉߸Խ͢Δ ϑΝΠΞ΢Υʔϧ΍/"5ͳͲͷϛυϧϘοΫε͔Βड͚ΔӨڹΛ ࠷খԽ w ϛυϧϘοΫε͸26*$ύέοτͷେ෦෼ΛݟΔ͜ͱ͕Ͱ͖ͳ͍ w ϛυϧϘοΫε͕ରԠ͍ͯ͠ͳ͍͔Β26*$Λ࢖͑ͳ͍ɼΞοϓάϨʔυͰ͖ͳ͍ͱ͍͏ࣄଶΛ ๷͍Ͱ͍Δɽ 11

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ΰʔϧ2ɿϋϯυγΣΠΫͷ஗Ԇ͕খ͍͞ w355ͰϋϯυγΣΠΫ 5-4ͷϋϯυγΣΠΫʹ૬౰ ʢΫϥΠΞϯτʣαʔόূ໌ॻͷݕূ ʢΫϥΠΞϯτɼαʔόʣ伴ަ׵ 12 ग़య IUUQTHJUIVCDPNqBOPZVLJIUUQOPUFCMPCNBTUFSIUUQOPUF@QEG

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ΰʔϧ3ɿHoLϒϩοΩϯάͷӨڹΛड͚ͮΒ͍ wίωΫγϣϯதʹෳ਺ͷετϦʔϜΛੜ੒ ετϦʔϜ͕5$1ͷετϦʔϜʹ૬౰͢Δ ֤ετϦʔϜ͸ಠཱ͍ͯ͠Δ ͋ΔετϦʔϜதͷσʔλ͕ಧ͔ͳͯ͘΋ɼผͷετϦʔϜΛྲྀ ΕΔσʔλ͸ϒϩοΫ͞Εͳ͍ 13 ΤϯυϙΠϯτ ΤϯυϙΠϯτ 26*$ετϦʔϜ 26*$ίωΫγϣϯ

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HoLϒϩοΩϯάͷྺ࢙ʢ1/8ʣ w)551 ϦΫΤετʹର͢ΔϨεϙϯε͕ฦͬͯ͜ͳ͍ͱɼ ࣍ͷϦΫΤετΛൃߦͰ͖ͳ͍ 8FCϖʔδͷ֎෦ϦιʔεಡΈࠐΈ ʢJNH΍TDSJQUʣʹ͕͔͔࣌ؒΔ w ͜ΕΒͷϦιʔεશͯΛॱ൪ʹʢ௚ྻʹʣऔಘ͢Δ 14

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HoLϒϩοΩϯάͷྺ࢙ʢ2/8ʣ w)5511JQFMJOJOH Ϩεϙϯε͕ฦΒͳ͍͏ͪʹ࣍ͷϦΫΤετΛൃߦͰ͖Δ֦ு )551ͷ࢓্༷ɼϨεϙϯεॱং͸ಉظ͠ͳ͍ͱ͍͚ͳ͍ w /൪໨ͷϨεϙϯε͕ະ౸ୡͷ࣌ɼ/ʴ൪໨ͷϨεϙϯε͕ಧ͍͍ͯͯ΋ɼ্Ґ૚ʹ౉͞Εͣʹ଴ػ ʢ)551ʹ͓͚Δ)P-#ʣ 1JQFMJOJOH͸ଟ͘ͷϒϥ΢βͰແޮʹ͞Εͯ͠·ͬͨ w ଟ͘ͷϓϩΩγ͕ରԠ͍ͯ͠ͳ͍ɼͳͲͷཧ༝ 15

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HoLϒϩοΩϯάͷྺ࢙ʢ4/8ʣ w)551ෳ਺ίωΫγϣϯ 5$1ίωΫγϣϯΛෳ਺ுΔɼ೴ےͳ΍Γํ ίωΫγϣϯ਺͚ͩฒྻʹऔಘͰ͖Δ w $ISPNFͰͭ΄ͲίωΫγϣϯΛுΔΒ͍͠ ιέοτͷແବɼαʔό΁ͷෛՙ૿ ίωΫγϣϯ͝ͱʹ᫔᫓੍ޚ͞ΕΔͷͰɼίωΫγϣϯ͋ͨΓͷ ੑೳΛϑϧʹൃشͰ͖ͳ͍ w ͦΕͧΕͷίωΫγϣϯ͕ଳҬΛޓ͍ʹୣ͍߹͏ঢ়ଶ 16

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HoLϒϩοΩϯάͷྺ࢙ʢ5/8ʣ w)551 )551ϨΠϠΛଟॏԽ͢Δ͜ͱͰɼγϯάϧ5$1ίωΫγϣϯͰ͋Γͳ͕Β ϦΫΤετΛฒྻʹൃߦͰ͖Δ w ϖʔδಡΈࠐΈ࣌ؒͷ୹ॖʹ੒ޭʂ ଟॏԽϦΫΤετɼϨεϙϯεͷ૊͝ͱʹҟͳΔ*%Λ෇༩ͯ͠ɼίωΫγϣϯதʹྲྀ͢ w )551͸ɼϦΫΤετ͝ͱʹ*%͕ͳ͔ͬͨ w ΫϥΠΞϯτ͕౤͛ͨϦΫΤετʹରԠ͢ΔϨεϙϯεΛࣝผ͢Δํ๏͸ͳ͔ͬͨ w ͦͷͨΊɼʮϨεϙϯε͸શͯ௚લʹൃߦͨ͠ϦΫΤετʹରԠ͢Δʯͱ͢Δ͔͠ͳ͍ 17 ग़య IUUQTEFWFMPQFSTHPPHMFDPNXFCGVOEBNFOUBMTQFSGPSNBODFIUUQ

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HoLϒϩοΩϯάͷྺ࢙ʢ6/8ʣ w)551 5$1ύέοτ͕ϩεͨ͠৔߹ɼ࠶ૹ଴͕ͪੜ͡Δ ͜ͷ࣌ɼผͷ*%Λ࣋ͬͨ)551ϨεϙϯεʢΛӡͿ5$1ύέοτʣ ΋ϒϩοΫ͞ΕΔʢ5$1ͷ)P-#ʣ w γϯάϧίωΫγϣϯ͔ͩΒ w Ͱ΋ɼ͜ͷϨεϙϯε͸ϩεͨ͠Ϩεϙϯεͱ͸ؔ܎ͳ͍ 18 )551ʹΑΔ)P-# ग़యIUUQTEPDTHPPHMFDPNQSFTFOUBUJPOE-4/$$W#JKBCOO4#CX3MNH/IO1')#Z&99QULQSFTFOU TMJEFJEHBGCEFC@

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HoLϒϩοΩϯάͷྺ࢙ʢ7/8ʣ w26*$ τϥϯεϙʔτϨϕϧͰଟॏԽͷ࢓૊ΈΛಋೖ ͋ΔετϦʔϜͰύέϩε͕ൃੜͯ͠΋ɼผͷετϦʔϜʹ͸Ө ڹ͠ͳ͍ w ύέϩε͕ൃੜͨ͠ετϦʔϜ͸ϒϩοΫ͕ى͜Δʢ)P-#͕ͳ͘ͳΔΘ͚Ͱ͸ͳ͍ʣ 19 26*$ʹΑΔ)P-#ͷ཈੍ ग़యɿIUUQTEPDTHPPHMFDPNQSFTFOUBUJPOE -4/$$W#JKBCOO4#CX3MNH/IO1')#Z&99QULQSFTFOU TMJEFJEHBGCEFC@

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HoLϒϩοΩϯάͷྺ࢙ʢ8/8ʣ w)551 26*$ΛτϥϯεϙʔτϨΠϠʹར༻͢Δ)551 )551ͱಉ͘͡ɼϦΫΤετϨεϙϯεͷ૊ʹ*%ΛׂΓ౰ͯΔ ͕ɼͦΕʹ26*$Λར༻͢Δɽ )551ͷܽ఺͕ղܾʂ 20 26*$ʹΑΔ)P-#ͷ཈੍ ग़యɿIUUQTEPDTHPPHMFDPNQSFTFOUBUJPOE -4/$$W#JKBCOO4#CX3MNH/IO1')#Z&99QULQSFTFOU TMJEFJEHBGCEFC@

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ΰʔϧ3ɿHoLϒϩοΩϯάͷӨڹΛड͚ͮΒ͍ʢ࠶ܝʣ wίωΫγϣϯதʹෳ਺ͷετϦʔϜΛੜ੒ ετϦʔϜ͕5$1ͷετϦʔϜʹ૬౰͢Δ ֤ετϦʔϜ͸ಠཱ͍ͯ͠Δ ͋ΔετϦʔϜதͷσʔλ͕ಧ͔ͳͯ͘΋ɼผͷετϦʔϜΛྲྀ ΕΔσʔλ͸ϒϩοΫ͞Εͳ͍ 21 ΤϯυϙΠϯτ ΤϯυϙΠϯτ 26*$ετϦʔϜ 26*$ίωΫγϣϯ

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QUICͷΰʔϧͱୡ੒ख๏·ͱΊ wσϓϩΠ͕؆୯ ϔομͷ҉߸ԽͰϛυϧϘοΫε͔ΒৄࡉΛӅṭ͢Δ wߋ৽͕؆୯ 6%1ͷ্ʹϢʔβεϖʔεͰಈ࡞͢Δϓϩτίϧͱ࣮ͯ͠૷ wϋϯυγΣΠΫͷ஗Ԇ͕খ͍͞ 5$1ͱ5-4Ͱผʑʹߦ͍ͬͯͨϋϯυγΣΠΫΛͭʹ·ͱΊͨ w)P-ϒϩοΩϯάͷӨڹΛड͚ͮΒ͍ ετϦʔϜʹΑΔଟॏԽ 22

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index w26*$ͱ͸ w26*$ͷϞνϕʔγϣϯ 5$1ͷෆຬ఺ 26*$ͷΰʔϧ )P-ϒϩοΩϯάʹ͍ͭͯ w26*$ͷৄࡉ w26*$ͷ՝୊ͱ͜Ε͔Β 23

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QUICͷ༻ޠ w26*$ίωΫγϣϯ 26*$Ͱ௨৴Λߦ͏ࡍɼ࠷ॳʹߏ੒͢ΔԾ૝తͳ௨৴࿏ *%ׂ͕Γ౰ͯΒΕɼϚΠάϨʔγϣϯ͕Մೳ w ճઢͷ੾Γସ͑΍/"5ϦόΠϯσΟϯά͕ىͬͯ͜΋ɼίωΫγϣϯΛ࡞Γ௚͢ඞཁ͕ͳ͍ w26*$ύέοτ 6%1ύέοτʹ֨ೲ͞ΕΔ w26*$ϑϨʔϜ 26*$ύέοτʹ֨ೲ͞ΕΔɼ26*$ͷ࠷খ୯Ґ ໾ׂ͝ͱʹ໊લͱϑΥʔϚοτ͕ܾΊΒΕ͍ͯΔ w ΞϓϦέʔγϣϯ૚σʔλʢϖΠϩʔυʣૹ৴༻ͷϑϨʔϜˠ453&".ϑϨʔϜ w "$,Λ఻͑ΔͨΊͷϑϨʔϜˠ"$,ϑϨʔϜ w26*$ετϦʔϜ 26*$ίωΫγϣϯ্ʹଟॏԽ͞ΕΔɼԾ૝తͳ௨৴࿏ɼ ࠶ૹ੍ޚɼϑϩʔ੍ޚͳͲ5$1ετϦʔϜͱࣅͨΑ͏ͳػೳΛ࣋ͭ ϖΠϩʔυ͸ετϦʔϜΛྲྀΕΔ 24

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QUICύέοτ wछྨͷύέοτϔομ ϩϯάϔομʔύέοτɿίωΫγϣϯཱ֬࣌ʹ࢖ΘΕΔ γϣʔτϔομʔύέοτɿίωΫγϣϯཱ֬ޙʹ࢖ΘΕΔ 25 ग़యɿ IUUQTUPPMTJFUGPSHIUNMESBGUJFUGRVJDUSBOTQPSU

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QUICύέοτ wύέοτφϯόʔ ૹ৴ύέοτ͝ͱʹՃࢉ͞ΕΔ஋ ύέϩεͷ൑அͳͲʹར༻͞ΕΔ w "$,͕ฦͬͯ͜ͳ͍ύέοτφϯόʔ͕ϩεͨ͠ ࠶ૹύέοτͰ͋ͬͯ΋Ճࢉ͞ΕΔ 26

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QUIC͸ϩεݕग़͕ΑΓγϯϓϧʹ wύέοτ*%ͱϖΠϩʔυΦϑηοτͷ෼཭ 26*$͸ϖΠϩʔυͷόΠτΦϑηοτΛύέϩε൑ఆʹ ར༻͠ͳ͍ w 5$1͸֬ೝԠ౴൪߸ʢϖΠϩʔυͷόΠτΦϑηοτʣΛར༻͍ͯͨ͠ w 5$1ΫϥΠΞϯτ͕ύέϩε൑ఆΛͯ͠࠶ૹͨ͠ޙɼ"$,͕ฦ͖ͬͯͨɼ͜ͷ"$,͸ɼͲͷૹ৴ύέοτʹର͢Δ"$,ͩΖ͏͔ʁ w ͜ͷ৔߹ɼ355Λਖ਼֬ʹਪଌͰ͖ͳ͘ͳΔ350 3FUSBOTNJTTJPO5JNFPVU ͷܾఆ͕ࠔ೉ʹ 27

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QUICϑϨʔϜ wશ෦Ͱछྨ ϑϨʔϜ͝ͱʹಛఆͷ໾ׂ͕͋Δ w ϖΠϩʔυૹ৴༻ʢ453&".ϑϨʔϜʣ w γάφϧɼͦͷଞͷσʔλૹ৴༻ʢͦͷଞʣ ಠࣗͷϑϨʔϜΛఆ֦ٛͯ͠ு͢Δ ͜ͱ΋Մೳ 28 ग़యɿ IUUQTUPPMTJFUGPSHIUNMESBGUJFUGRVJDUSBOTQPSU

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QUICͦͷଞͷػೳ wϑϩʔ੍ޚ ௨৴૬खͷड৴΢Οϯυ΢͕ᷓΕͳ͍Α͏ʹྲྀྔΛ੍ޚ͢Δػೳ ֤ετϦʔϜͱίωΫγϣϯͷ྆ํͷϨϕϧͰߦΘΕΔ w᫔᫓੍ޚ ωοτϫʔΫͷ᫔᫓͕ى͜Βͳ͍Α͏ྲྀྔΛ੍ޚ͢Δػೳ &$/&YQMJDJU$POHFTUJPO/PUJpDBUJPOʢ໌ࣔత᫔᫓௨஌ʣͷ αϙʔτ w ᫔᫓࣌ɼωοτϫʔΫϊʔυ͕*1ϔομʹରͯ͠ϑϥάΛཱͯɼϗετʹ᫔᫓Λ௨஌͢Δ 29

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Real World QUIC w26*$ͱݱ࣮ͷΠϯλʔωοτ ೥$ISPNFʹ26*$αϙʔτ௥ՃʢσϑΥϧτͰ0''ʣ ೥΄Ͳͷ$ISPNFϢʔβʹରͯ͠σϑΥϧτͰ༗ޮԽ ೥΄΅શͯͷ$ISPNFϢʔβͱ"OESPJE:PV5VCFBQQͰ༗ޮԽ 30

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Real World QUIC wݕࡧ଴ͪ࣌ؒʹର͢ΔධՁ ݕࡧ༻ޠΛೖྗ͔ͯ͠Βɼશͯͷίϯςϯπ͕දࣔ͞ΕΔ·Ͱͷ࣌ؒ wͦͷଞͷධՁ :PV5VCF w ϏσΦ࠶ੜ଴ͪ࣌ؒ ΄Ͳͷվળ w ϑϦʔζ࣌ؒ ˋ΄Ͳͷվળ 355ʹର͢ΔධՁ w ৄ͘͠͸࿦จͰ 31

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index w26*$ͱ͸ w26*$ͷϞνϕʔγϣϯ 5$1ͷෆຬ఺ 26*$ͷΰʔϧ )P-ϒϩοΩϯάʹ͍ͭͯ w26*$ͷৄࡉ w26*$ͷ՝୊ͱ͜Ε͔Β 32

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QUICͷ՝୊ɼݒ೦఺ wߴ͍$16࢖༻཰ 5$15-4ͷ໿ഒ w 26*$ͷεςʔτϚγϯ؅ཧɼϢʔβʔεϖʔε࣮૷ʹΑΔΦʔόʔϔουʢଟ਺ͷγεςϜίʔϧɼ/*$Φϑϩʔ υͷܽ೗ʣ w޿ଳҬɼ௿஗Ԇɼ௿ଛࣦ؀ڥͰͷੑೳྼԽ 26*$͕ಘҙͳͷ͸ɼߴ஗Ԇɼߴଛࣦ؀ڥ ٯͷ؀ڥͩͱɼ5$1ΑΓੑೳ͕ѱ͘ͳΔ͜ͱ΋ w 5$1͸௕೥࢖ΘΕ͍ͯΔͷͰόΩόΩʹ࠷దԽ͞ΕͯΔ w 26*$͸ϢʔβεϖʔεͰಈ࡞͢ΔͨΊɼ04εέδϡʔϥͷಈ࡞΋ΧʔωϧεϖʔεͰಈ͘5$1ͱҟͳΔ wར༻Ͱ͖ͳ͍ ϑΝΠΞ΢ΥʔϧͰ26*$·ͨ͸6%1͕ϒϩοΫ͞ΕΔՄೳੑ w (PPHMFͷܭଌ࣮ݧͷ෼ੳ݁Ռ͔ΒɼશମͷͰ26*$͕ϒϩοΫ͞Ε͍ͯΔ w اۀωοτϫʔΫͷதʹ͍Δ৔߹͕ଟ͍ 33

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QUICͷ͜Ε͔Β wݱࡏ͸Wͷ࢓༷ݕ౼த ඪ४Խ·Ͱͷ࣌ؒΛ୹ॖ͢ΔͨΊɼ8FC༻్ʹݶఆ͠ػೳ΋ߜͬ ͍ͯΔ wͦͷޙͷ֦ு )551ετϦʔϜͷ༏ઌ౓੍ޚ %/4PWFS26*$ .VMUJQBUI26*$ 8FC5SBOTQPSUʢ8FC4PDLFUͷΑ͏ͳΫϥΠΞϯτɼαʔόؒ ͷ૒ํ޲௨৴ʣ 34

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·ͱΊ w26*$ͷಛ௃͸ͭ σϓϩΠ͕؆୯ ߋ৽͕؆୯ ϋϯυγΣΠΫͷ஗Ԇ͕খ͍͞ )P-ϒϩοΩϯάͷӨڹΛड͚ͮΒ͍ w26*$͸ߴ஗Ԇɼߴଛࣦͷ؀ڥͰޮՌΛൃش͢Δ w26*$͸͍͍ͧ 5$1ʹ͋ͬͨ΋Ζ΋Ζͷ՝୊Λ͏·͘ղܾ͍ͯ͠Δͱ͜Ζ͕͋ͬ ͯ໘ന͍ 35

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