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なめらかなシステムを目指して / Toward The Coherently Fittable System

なめらかなシステムを目指して / Toward The Coherently Fittable System

Kentaro Kuribayashi

July 05, 2018
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  1. ܀ྛ݈ଠ࿠ɼࡾ୐༔հɼদຊ྄հ / Pepabo R&D Institute, GMO Pepabo, Inc.
    2018.07.05 DICOMO2018γϯϙδ΢Ϝ
    ͳΊΒ͔ͳγεςϜΛ໨ࢦͯ͠

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  2. 1. എܠͱ໨త
    2. ઌߦݚڀͷݕ౼
    3. ͳΊΒ͔ͳγεςϜ
    4. ݚڀͷ۩ମྫ
    5. ·ͱΊͱࠓޙͷల๬
    2
    ໨࣍

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  3. 1.
    എܠͱ໨త

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  4. γεςϜߏ૝ʹ͓͚Δੜ໋ମͷ͘͠Έ΁ͷࢀরʢ1/2ʣ
    4
    ͋Δ૷ஔ͕ɼաڈͷܦݧʹΑͬͯɼಛఆͷߏ଄ͳΓػೳΛ΋ͭΑ͏ʹ͘;
    ͏Ͱ͖Δͱ͍͏͜ͱ͔Βɼ޻ֶʹ͓͍ͯ΋ੜ෺ֶʹ͓͍ͯ΋ඇৗʹڵຯ
    ਂ͍৽͍͠ଶ౓͕ੜͯ͘͡Δɽ޻ֶʹ͓͍ͯ͸ɼ͜ͷΑ͏ͳ͘;͏ʹΑͬ
    ͯɼήʔϜΛߦͬͨΓɼಛఆͷ໨తΛ௥ٻͯ͠ߦಈ͢Δ૷ஔ͕ͭ͘ΒΕΔ
    ͹͔ΓͰͳ͘ɼաڈͷܦݧʹΑΓͦͷಈ࡞Λͨ͑ͣվળͯ͠Ώ͘Α͏ʹ͢
    Δ͜ͱ΋ߟ͑ΒΕΔɽʢதུʣੜ෺ֶతʹ͸ɼͨͿΜੜ໋ݱ৅ͷத৺Ͱ
    ͋ΔͱݟΒΕΔ΋ͷͱɼগͳ͘ͱ΋ྨࣅͳ΋ͷΛݟग़͢͜ͱ͕Ͱ͖Δɽ
    Norbert Wiener. Cybernetics or Control and Communication in the Animal and the Machine, Vol. 25. MIT press, 1961. ʢ஑ݪࢭፂ෉ɼከӬণ٢ɼࣨլࡾ
    ࿠ɼށా؜ ʢ༁ʣɽαΠόωςΟοΫε–ಈ෺ͱػցʹ͓͚Δ੍ޚͱ௨ ৴ɽؠ೾ॻళɽ2011ʣ.Լઢ͸Ҿ༻ऀʹΑΔɽ
    l
    z

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  5. • γεςϜΛߏ૝͢Δʹࡍͯ͠ੜ໋ମͷ͘͠ΈΛࢀর͖ͯͨ͠ɿ
    • 1948೥ɿୈೋ࣍ੈքେઓޙʹຄڵͨ͠αΠόωςΟΫε
    • ϑΟʔυόοΫػߏʹΑΔࣗݾ੍ޚɾௐ੔
    • 1958೥ɿχϡʔϥϧωοτϫʔΫʢύʔηϓτϩϯʣ
    • ʢུʣ
    • 2012೥ɿਂ૚ֶशͷരൃతͳਐԽͷ࢝·Γ
    • ੜ෺ͷࢹ֮ͱ೴ͷ࢓૊ΈΛϞσϧʹͨ͠ख๏
    • ͜͏ͨ͠ࢀরΛɼࣗ཯దԠ͢ΔγεςϜͷߏ૝ɾ࣮ݱʹ׆༻͢ΔྲྀΕ
    5
    γεςϜߏ૝ʹ͓͚Δੜ໋ମͷ͘͠Έ΁ͷࢀরʢ2/2ʣ

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  6. 1. γεςϜ͕ར༻ऀʹͱͬͯ༗༻Ͱ͋ΔͨΊʹ͸ɼར༻ऀͷओ؍తͳ൑அج४
    Λߟྀ͢Δඞཁ͕͋Δ͜ͱ
    • γεςϜ͕ࣗ଍తʹࣗ཯దԠ͢Δ͚ͩͰ͸ɼར༻ऀʹͱͬͯ༗༻ͨΓಘͳ͍
    • ࣗಈӡసͰ͑͞΋ʮڀۃͷબ୒ʯʹ͓͍ͯ͸ɼྙཧ؍Λߟྀͤ͟ΔΛಘͳ͍
    2. ͦ΋ͦ΋ɼར༻ऀ͸ࣗ਎ͷબ޷ΛγεςϜར༻ʹઌཱ͍֮ͬͯࣗͯ͠Δͱ͸
    ݶΒͳ͍͜ͱ
    • ECαΠτͰߪೖͯ͠ॳΊͯɼࣗΒͷબ޷ʹؾͮ͘͜ͱ΋͋Δɽ
    • ͦΕΛ͋Β͔͡Ίשىɾ੍ޚ͢Δͷ͕޿ࠂٕज़
    6
    ࣗ཯దԠγεςϜͷ՝୊

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  7. 1. ػց͔ΒͳΔ৘ใγεςϜͷΈͰ͸ͳ͘ɼར༻ऀͷओ؍తͳ൑அج४΍બ޷
    ౳ͷར༻ऀͦΕͧΕʹݻ༗ͷίϯςΩετΛ΋৫ΓࠐΜͩɼར༻ऀͱ৘ใγ
    εςϜͱ͔ΒͳΔ૯ମͱͯ͠ͷγεςϜΛߟ͑Δ͜ͱʢҎԼɼཁٻᶃʣ
    • ར༻ऀͦΕͧΕʹݻ༗ͷίϯςΩετΛɼγεςϜͷߏ૝ʹ৫ΓࠐΉඞཁ
    2. ར༻ऀͦΕͧΕʹݻ༗ͷίϯςΩετ͸ඞͣ͠΋ࣄલʹ໌֬Ͱ͸ͳ͘ɼ৘ใ
    γεςϜͱͷίϛϡχέʔγϣϯΛ௨ͯ͡ࣄޙతʹܗ੒͞ΕΔͱ͍͏લఏΛ
    ஔ͘͜ͱʢҎԼɼཁٻᶄʣ
    • ίϯςΩετͷܗ੒աఔͱͯ͠ɼར༻ऀͱγεςϜͷؔ܎Λ೺Ѳ͢Δඞཁ
    7
    ՝୊͔Βಋ͖ग़͞ΕͨγεςϜ΁ͷཁٻ

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  8. 2.
    ઌߦݚڀͷݕ౼

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  9. • ར༻ऀʹͱͬͯ༗༻ͳ৘ใγεςϜߏ૝͸ɼʮ1. എܠͱ໨తʯͰड़΂ͨɼࣗ཯
    దԠతͳγεςϜ΁ͷ2ͭͷཁٻΛຬͨ͢ඞཁ͕͋Δ
    • 2ͭͷཁٻʹର͢ΔΞϓϩʔνͱͯ͠ɼҎԼʹ͍ͭͯͦΕͧΕݕ౼ɾධՁ͢Δ
    • ίϯςΩετΞ΢ΣΞωε
    • جૅ৘ใֶ
    9
    2ͭͷΞϓϩʔν

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  10. • ϢϏΩλεɾίϯϐϡʔςΟϯάɼϞόΠϧɾίϯϐϡʔςΟϯάΛഎܠʹݱ
    Εͨݚڀίϯηϓτ
    “Context is any information that can be used to characterize the situation of
    an entity. An entity is a person, place, or object that is considered relevant
    to the interaction between a user and an application, including the user and
    applications themselves.”
    ”A system is context-aware if it uses context to provide relevant information
    and/or services to the user, where relevancy depends on the user’s task.”
    10
    ίϯςΩετΞ΢ΣΞωε
    Gregory D Abowd, Anind K Dey, Peter J Brown, Nigel Davies, Mark Smith, and Pete Steggles. Towards a better understanding of context and context-
    awareness. In International Symposium on Handheld and Ubiquitous Computing, pp. 304–307. Springer, 1999.

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  11. • ίϯςΩετΞ΢ΣΞͳγεςϜ͸ɼҎԼ3ͭͷಛ௃Λ࣋ͭɿ
    1. ར༻ऀʹର͢Δద੾ͳ৘ใ΍αʔϏεఏڙͷͨΊɼίϯςΩετΛ༻͍Δ
    ͜ͱ
    2. ͦͷࡍɼࣗಈతʹαʔϏεఏڙ͕ߦΘΕΔ͜ͱ
    3. ηϯαʔσʔλ͕͍͔ͳΔίϯςΩετʹଐ͢Δ͔Λܾఆ͢ΔͨΊʹɼί
    ϯςΩετʹରͯ͠λά෇͚ɾ஫ऍ͕ߦΘΕΔ͜ͱ
    11
    ίϯςΩετΞ΢ΣΞͳγεςϜͷಛ௃

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  12. • ཁٻᶃͷड़΂ΔࣄଶΛ૝ఆ͢Δ͜ͱͰɼγεςϜ͕ͦͷར༻ऀʹͱͬͯద੾ͳ
    ༗༻ੑΛఏڙ͢Δ͜ ͱ͕ಛ௃͚ͮΒΕ͍ͯΔ
    • ҰํͰɼཁٻᶄΛຬͨ͢ʹ͸΋͏Ұา౿ΈࠐΜͰγεςϜΛߏ૝͢Δඞཁ͕͋
    Δɽ͢ͳΘͪɼίϯςΩετʹԊͬͨ৘ใ΍αʔϏεΛఏڙ͢Δ͚ͩͰ͸ෆे
    ෼Ͱ͋Γɼར༻ऀͷཁٻͦͷ΋ͷͷܗ੒ʹӨڹΛٴ΅͢γεςϜΛߏ૝͢Δඞ
    ཁ͕͋Δ
    12
    ຊ࿦ʹ͓͚ΔίϯςΩετΞ΢ΣΞωεͷධՁ

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  13. • ੢֞௨Λத৺ʹߏங͞Ε͖ͯͨ৽ͨͳֶ໰ྖҬ
    • ৘ใ޻ֶɼԠ༻৘ใՊֶɼࣾձ৘ใֶΛ·ͨ͗ɼֶࡍతͳ৘ใֶͷجૅ͚ͮΛ
    ໨తͱ͢Δͦͷٞ࿦ͷࣹఔ͸ɼඇৗʹ޿ൣʹΘͨΔ
    • ΦʔτϙΠΤʔγεཧ࿦Λ൷൑తʹܧঝ͠ɼʮ֊૚తࣗ཯ίϛϡχέʔγϣϯɾ
    γεςϜʯʢHACSɿHierarchical Autonomous Communication Systemʣͱ
    ݺ͹ΕΔγεςϜ؍Λఏএ
    • զʑͷ৘ใγεςϜͷߏ૝ʹԠ༻͢Δ؍఺͔Βɼجૅ৘ใֶʹ͍ͭͯݕ౼͢Δ
    13
    جૅ৘ใֶ

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  14. جૅ৘ใֶ͕ఏএ͢ΔγεςϜ
    ʢHACSʣ͸ɼҎԼ3ͭͷಛ௃Λ࣋
    ͭɿ
    1. ୯ಠͷγεςϜͰ͸ͳ͘ɼγες
    Ϝͷ؍࡯ͱطड़Λߦ͏ਓؒͱߏ଄
    తΧοϓϦϯάͨ͠ෳ߹γεςϜ
    Ͱ͋Δ͜ͱ
    جૅ৘ใֶ͕ఏএ͢ΔγεςϜͷಛ௃ʢ1/2ʣ
    14

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  15. 2. ֊૚ੑΛ΋ͭ͜ͱɽͦͷͨΊɼ͋
    ΔγεςϜ͸ಉ֊૚͔ΒݟΕ͹ࣗ
    ཯తʹ;Δ·͏Α͏ʹݟ͑Δ͕ɼ
    ্Ґͷ֊૚͔ΒݟΕ͹ଞ཯తͰ͋
    ΔΑ͏ʹݟ͑Δ
    3. ߏ଄తΧοϓϦϯά͞Εͨγες
    Ϝಉ࢜ͷίϛϡχέʔγϣϯͷܧ
    ଓൃੜʹΑͬͯɼγεςϜͷ҆ఆ
    తͳҡ͕࣋ࣔ͞ΕΔ͜ͱɽ
    جૅ৘ใֶ͕ఏএ͢ΔγεςϜͷಛ௃ʢ2/2ʣ
    15

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  16. • 2ͭͷཁٻΛຬͨ͢γεςϜ؍Λߏ૝͢Δ্Ͱɼجૅ৘ใֶ͸େ͖ͳਐలΛ΋
    ͨΒͯ͘͠ΕΔ΋ͷ
    • ৘ใγεςϜΛɼ͋͘·Ͱ΋ར༻ऀͷίϛϡχέʔγϣϯΛഔհ͢Δଞ཯తͳ
    ICTʹཹΊΔݟํʹݶք͕͋Δ
    • ਓؒͱ৘ใγεςϜͱͷίϛϡχέʔγϣϯͷաఔʹ͓͍ͯɼલઅͰΈͨʮί
    ϯςΩετʯΛ૑ग़͠ಘΔ΋ͷͱͯ͠ͷγεςϜ؍͕ඞཁͳͷͰ͸ͳ͍͔ʁ
    • ͘͝جૅతͳྫɿോ͕ʮ֓೦ʯΛֶशͰ͖ΔΑ͏ʹɼਂ૚ֶशʹΑΔγες
    Ϝ΋ʮ֓೦ʯΛֶशͰ͖Δ
    16
    ຊ࿦ʹ͓͚Δجૅ৘ใֶͷධՁ

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  17. 3.
    ͳΊΒ͔ͳγεςϜ

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  18. • ʮ1. എܠͱ໨తʯͰड़΂ͨ2ͭͷཁٻΛಉ࣌ʹຬͨ͢զʑͷγεςϜ؍Λɼ
    ʮͳΊΒ͔ͳγεςϜʯͱ໊෇͚Δɽ
    • ͳΊΒ͔ͳγεςϜ͸ɼ͜Ε·Ͱݕ౼͖ͯͨ͠ҎԼ2ͭʹجͮ͘ɿ
    • ੜ໋ମͷ͘͠Έʹ฿͍γεςϜΛߏ૝͖ͯͨ͠޻ֶత఻౷
    • ίϯςΩετΞ΢ΣΞωεɼ͓Αͼɼجૅ৘ใֶʹ͍ͭͯͷݕ౼ɾධՁ
    18
    ͳΊΒ͔ͳγεςϜ

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  19. ͳΊΒ͔ͳγεςϜͱ͸ɼ৘ใγεςϜͷ͜ͱΛ͍͏ͷΈͳΒͣɼޓ͍ʹӨڹΛ
    ٴ΅͠߹͏ܧଓతͳؔ܎ʹ͋Δར༻ऀʢϢʔβʔ͓Αͼ։ൃӡ༻ऀʣͱ৘ใγ
    εςϜͱ͔ΒͳΔ૯ମͱͯ͠ͷγεςϜͰ͋ΓɼҎԼͷཁ݅Λຬͨ͢
    1. ར༻ऀͱ৘ใγεςϜͱ͕ܧଓతͳؔ܎ΛऔΓ࣋ͭաఔʹ͓͍ͯɼར༻ऀ
    ͦΕͧΕʹݻ༗ͷίϯςΩετΛݟग़ͨ͠Γɼ৽ͨͳίϯςΩετΛ૑ग़
    ͨ͠ΓͰ͖Δ͜ͱ
    2. ཁ݅1Λɼར༻ऀʹΑΔ໌ࣔతͳૢ࡞Λ՝͢͜ͱͳ࣮͘ݱͰ͖Δ͜ͱ
    3. ཁ݅1͓Αͼ2ʹΑͬͯಘΒΕͨίϯςΩετʹج͖ͮɼ৘ใγεςϜ͕ར
    ༻ऀʹରͯ͠࠷దͳαʔϏεΛࣗಈతʹఏڙͰ͖Δ͜ͱ
    19
    ͳΊΒ͔ͳγεςϜͷఆٛ

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  20. ͳΊΒ͔ͳγεςϜͷϞσϧʢ1/2ʣ
    20
    લड़ͷਤ2ͱ͸ҟͳΓɼ৘ใγεςϜ͕୯ͳΔഔհͰ͋ΔʹͱͲ·ΒͣɼϢʔ
    βʔͱ։ൃӡ༻ऀͷ૒ํͱɼޓ͍ʹӨڹΛٴ΅͠߹͏ܧଓతͳؔ܎ʹ͋Δಠཱ
    ͨ͠γεςϜͰ͋Δ

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  21. 1. ར༻ऀͱ৘ใγεςϜͱ͕ܧଓతͳؔ܎ΛऔΓ࣋ͭաఔͰɼඞͣ͠΋ར༻ऀ
    ʹͱͬͯࣄલʹ໌֬Ͱ͋Δͱ͸ݶΒͳ͍બ޷͕ɼঃʑʹ໌Β͔ʹͳ͍ͬͯ͘
    ʢཁ݅1ʣ
    2. ͦͷࡍɼίϯςΩετɾΞ΢ΣΞωε౳ͷɼઌߦݚڀͷख๏ΛऔΓೖΕɼར
    ༻ऀʹΑΔ໌ࣔతͳૢ࡞Λ՝͢͜ͱͳ͘৽ͨͳίϯςΩετΛ૑ग़͢Δ͜ͱ
    Ͱɼར༻ऀ͸࿑ۤͳ͘৘ใγεςϜͱͷؔ܎ΛܧଓͰ͖Δʢཁ݅2ʣ
    3. ݻ༗ͷίϯςΩετʹଈͯ͠৘ใγεςϜ͕࠷దͳαʔϏεΛࣗಈతʹఏڙ
    ͢Δʢཁ݅3ʣ͜ͱͰɼ݁Ռͱͯ͠ར༻ऀʹͱͬͯߴ͍༗༻ੑΛಘΒΕΔ͜ͱ
    Λظ଴Ͱ͖Δ
    21
    ͳΊΒ͔ͳγεςϜͷϞσϧʢ2/2ʣ

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  22. 4.
    ݚڀͷ۩ମྫ

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  23. • ͳΊΒ͔ͳγεςϜΛ۩ମతʹ࣮૷͢Δʹࡍͯ͠͸ɼͨͱ͑͹ҎԼͷΑ͏ͳٙ
    ໰ʹճ౴͍ͯ͘͠ඞཁ͕͋Δɿ
    • ར༻ऀͱ৘ใγεςϜͱͷݻ༗ͷίϯςΩετʹ͓͍ͯɼ͍͔ͳΔද৅Λ༻
    ͍Δ͜ͱ͕ίϛϡχέʔγϣϯͷܧଓʹد༩͢Δ͔ʁʢཁ݅1ɼ2ʹؔ࿈ʣ
    → ྨࣅը૾ݕࡧγεςϜ
    • ίϯςΩετΛݟग़͠ɼ࠷దͳαʔϏεΛࣗಈతʹఏڙ͢ΔͨΊʹ͸ɼར༻
    ऀͱ৘ใγεςϜͱͷίϛϡχέʔγϣϯͷཻ౓ΛΑΓࡉ͔͍ͯ͘͘͠ඞཁ
    ͕͋ΔͷͰ͸ͳ͍͔ʁʢཁ݅3ʹؔ࿈ʣ
    → WebϗεςΟϯάʹؔ͢Δݚڀ
    23
    ͳΊΒ͔ͳγεςϜ࣮ݱͷͨΊʹ

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  24. • ECαΠτͷதͰ΋ɼͱΓΘ͚Ұ఺෺
    Λѻ͏ϋϯυϝΠυϚʔέοτͰ͸ɼ
    ར༻ऀͷཁٻΛݟۃΊͮΒ͍
    • ྨࣅը૾ʹΑΔؔ࿈঎඼ݕࡧγες
    ϜΛߏஙɾఏڙ͢Δ͜ͱͰɼࢹ֮త
    ͳ௚ײʹجͮ͘ίϯςΩετΛݟग़
    ͢ݚڀ
    ྨࣅը૾ݕࡧγεςϜ
    24
    ࡾ୐༔հ, দຊ྄հ, ྗ෢݈࣍, ܀ྛ݈ଠ࿠. ಛ௃நग़ثͷ ֶशͱߪങཤྺΛඞཁͱ͠ͳ͍ྨࣅը૾ʹΑΔؔ࿈঎඼ݕ ࡧγεςϜ. ݚڀใࠂΠϯλʔωοτͱӡ༻
    ٕज़ʢIOTʣ, Vol. 2017-IOT-37, No. 4, pp. 1–8, 2017.

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  25. WebϗεςΟϯάʹؔ͢Δݚڀ
    25
    • ར༻ऀͱ৘ใγεςϜͱͷؒͷίϯ
    ςΩετͷཻ౓Λࡉ͔͘͢Δݚڀɿ
    • ϦΫΤετ୯ҐͰͷWebαʔόͷ
    Ϧιʔε੍ޚ ※1
    • ϦΫΤετ୯ҐͰͷίϯςφͷ࠶
    ഑ஔʢӈਤʣ ※2
    ※1 দຊ྄հ, ܀ྛ݈ଠ࿠, Ԭ෦णஉ. ϦΫΤετ୯ҐͰԾ૝తʹϋʔυ΢ΣΞϦιʔεΛ෼཭͢Δweb αʔόͷϦιʔε੍ޚΞʔΩςΫνϟ. ৘ใॲཧֶձ࿦จ
    ࢽ, Vol. 59, No. 3, pp. 1016–1025, mar 2018.
    ※2 দຊ྄հ, தా༟و, ܀ྛ݈ଠ࿠. ઀ଓ଴ͪιέοτੜ੒લͷϓϩηεΠϝʔδΛར༻ͨ͠Webαʔόͷ൚༻తͳىಈ࣌ؒ୹ॖख๏. ݚڀใࠂΠϯλʔωοτ
    ͱӡ༻ٕज़ʢIOTʣ, Vol.2018-IOT-42, pp.1-8, Jun 2018.

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  26. 5.
    ·ͱΊͱࠓޙͷల๬

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  27. • ੜ໋ମͷ͘͠Έʹ฿͍γεςϜΛߏ૝͖ͯͨ͠޻ֶత఻౷Λܧঝͭͭ͠ɼίϯ
    ςΩετΞ΢ΣΞωε͓Αͼجૅ৘ใֶʹ͍ͭͯݕ౼ɾධՁ͍ͯͬͨ݁͠Ռɼ
    ར༻ऀͱ৘ใγεςϜͱͷ΍ΓͱΓͷաఔʹཱ͓͍ͯͪݱΕΔݻ༗ͷίϯςΩ
    ετΛѻ͏ɼզʑͷγεςϜ؍ͱͯ͠ͷʮͳΊΒ͔ͳγεςϜʯʹߦ͖ண͍ͨ
    • ͦͷ࣮૷ͷͨΊʹ͸ɼίϯςΩετΛഔհ͢Δද৅ͷ୳ٻ΍ɼίϛϡχέʔγϣ
    ϯͷཻ౓ͷ࣮ݱ͕ඞཁʹͳΔɽECαΠτʹ͓͚Δྨࣅը૾ݕࡧγεςϜ΍ɼ
    WebϗεςΟϯάʹؔ͢Δݚڀʹ͓͍ͯɼ۩ମతͳ࣮૷ΛਐΊ͍ͯΔ
    27
    ·ͱΊ

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  28. • AI΍IoT͕͞Βʹඈ༂తʹൃల͠ɼ৘ใγεςϜ͕৽ͨͳʮ֓೦ʯΛ๲େʹֶ
    श͍ͯ͘͜͠ͱ͕ݟࠐ·ΕΔ
    • ͦ͏ֶͨ͠श಺༰͸ɼ݁Ռతʹ༗༻ʹར༻͞Εͨͱͯ͠΋ɼਓؒʹͱͬͯཧղ
    Մೳͳ΋ͷͰ͋Δͱ͸ݶΒͳ͍ʢγϯϘϧάϥ΢ϯσΟϯά໰୊ʣ
    • Ͱ͋Ε͹ͦ͜ɼຊ࿦ͷड़΂ΔʮͳΊΒ͔ͳγεςϜʯͱ͍͏γεςϜ؍ʹجͮ
    ͖ɼ૯ମͱͯ͠ͷγεςϜΛ಺෦͔Β؍ଌ͢Δऀͱͯ͠։ൃɾӡ༻Λଓ͚͍ͯ
    ͘औΓ૊Έ͕ɼࠓޙ·͢·͢ॏཁʹͳ͍ͬͯͩ͘Ζ͏
    28
    ࠓޙͷల๬

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  29. ݚڀһɺੵۃతʹืूதʂ
    http://rand.pepabo.com/

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