ハンドメイド作品を対象としたECサイトにおける単語の出現頻度を用いた稀覯品の検出 / Detection of Rare Works Using Term Frequency on Electronic Commerce Site for Trading Handmade Works

໺ଜ޸໋(ϖύϘݚڀॴ), ࡾ୐༔հ(ϖύϘݚڀॴ)
2020.05.15 ୈ89ճCSECୈ49ճIOT߹ಉݚڀൃදձ
ϋϯυϝΠυ࡞඼Λର৅ͱͨ͠ECαΠτʹ
͓͚Δ୯ޠͷग़ݱස౓Λ༻͍ͨك᧵඼ͷݕग़

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1. ݚڀͷഎܠͱ໨త
2. ك᧵඼ͷݕग़ͱͦͷ՝୊
3. ఏҊख๏
4. ධՁ
5. ·ͱΊͱࠓޙͷ՝୊
2
໨࣍

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1.
ݚڀͷഎܠͱ໨త

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• ϋϯυϝΠυ࡞඼Λѻ͏CtoCͷECαΠτͷྲྀ௨ֹ͸૿Ճ͍ͯ͠Δ
• ϋϯυϝΠυ࡞඼͸ɺσβΠϯ΍੍࡞͕ख࡞ۀͰߦΘΕͨ΋ͷͰ͋ΔͨΊɺ 
࡞඼ͷرগੑ΍ಠ૑ੑ͕Ձ஋ͷҰ୺ͱͳ͍ͬͯΔ
• ӡӦऀ͸ɺرগੑ΍ಠ૑ੑ͕͋Δ௝͍͠࡞඼ʢك᧵඼ʣͷൃݟʹऔΓ૊Ή
• ൢചͷଅਐ΍ݕࡧੑͷ޲্ʹར༻
4
ݚڀͷഎܠ

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5
ك᧵඼
యܕతͳ࡞඼ ك᧵඼
࡞඼λΠτϧ
7SJKIJFEϝϯζɹࡒ෍ɹೋͭંΓɹຊֵ
৬ਓ͕ख࡞ΓϓϨθϯτΧʔϑϨβʔ
จݿֵʮ೔ຊͷࠛ஬γϦʔζʯೋͭ
ંΓࡒ෍ΞόϯΪϟϧυ࠼৭WFS
ը૾
• ϋϯυϝΠυ࡞඼Λѻ͏ECαΠτʮminneʯʹ͓͚Δయܕతͳ࡞඼ͱك᧵඼
• ك᧵඼͸رগੑ΍ಠ૑ੑ͕͋Δ௝͍͠࡞඼

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• ൢചͷଅਐ
• ϋϯυϝΠυ࡞඼Λѻ͏ECαΠτʹ͸ɺ࡞඼ʹرগੑ΍ಠ૑ੑΛٻΊΔར
༻ऀ͕ଘࡏ͢Δ
• ͜ͷΑ͏ͳར༻ऀʹرগੑ΍ಠ૑ੑ͕༏Εͨك᧵඼Λ঺հ͢Δ͜ͱͰɺߪ
ೖ཰ͷ޲্͕ظ଴͞ΕΔ
• ϋϯυϝΠυ࡞඼ಛ༗ͷൢചଅਐͷޮՌ͕ߴ͍࡞඼͕ଘࡏ͢Δ
6
ك᧵඼ͷ༻్ᶃ

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• ݕࡧੑͷ޲্
• ECαΠτͰ͸࡞඼ʹڞ௨͢Δಛੑຖʹ෼ྨͨ͠ΧςΰϦΛ࡞඼ʹઃఆ͢Δ
• ΧςΰϦͷઃఆ͕ద੾Ͱͳ͍৔߹͕͋ΔͨΊɺΧςΰϦؒҧ͍ͷ࡞඼Λൃ
ݟ͠मਖ਼͢Δ͜ͱͰݕࡧੑͷ޲্͕ظ଴Ͱ͖Δ
• ك᧵඼ʹ͸ɺ࡞඼ू߹ʹ͓͍ͯرগੑ΍ಠ૑ੑͷ౓߹͍͕ߴ͗͢Δ΋ͷ͕
͋Δ 
ˠ ͜ͷΑ͏ͳ࡞඼͸ΧςΰϦؒҧ͍ͷ࡞඼Ͱ͋ΔՄೳੑ͕ߴ͍
7
ك᧵඼ͷ༻్ᶄ

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8
ݚڀͷ໨త
• ޮ཰Α͘ك᧵඼Λൃݟ͢ΔͨΊʹɺ࡞඼ू߹͔Βك᧵඼Λݕग़͠ɺݕग़ͨ͠ك
᧵඼Λ෼ྨ͢Δ
ك᧵඼
શ࡞඼
యܕతͳ࡞඼ ΧςΰϦؒҧ͍ͷ࡞඼
ൢചଅਐͷޮՌ͕ߴ͍࡞඼
PS

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2.
ك᧵඼ͷݕग़ͱͦͷ՝୊

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• ك᧵඼ͷൃݟʹ͸ɺ࡞඼ू߹ʹڞ௨͢Δಛੑ͔Βయܕతͳ࡞඼ΛٻΊɺ͜ΕΒ
͕࣋ͨͳ͍௝͍͠ಛੑ͕͋Δ࡞඼Λ୳͢ඞཁ͕͋Δ
10
ك᧵඼ͷൃݟ
ك᧵඼
શ࡞඼
యܕతͳ࡞඼

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• ك᧵඼ͷ൑அج४͸࡞඼ू߹͝ͱʹҟͳΔ
• ࡞඼ू߹͝ͱʹڞ௨͢Δಛੑ͸ҟͳΓɺయܕతͳ࡞඼΋ҟͳΔ
11
ك᧵඼ͷൃݟͷ՝୊
࡞඼ͷछྨ͕ଟ༷Ͱ͔ͭܧଓతʹมԽ͢ΔECαΠτͰ͸ɺ࡞඼ू߹ʹڞ௨͢Δಛੑ
ΛखಈͰݸผʹٻΊͣك᧵඼Λݕग़͍ͨ͠

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• ར༻ऀͷධՁʢߪೖཤྺͳͲʣΛ༻͍Δҙ֎ੑΛॏࢹͨ͠ਪનख๏
• ະ஌ͷ৘ใ΍ҙ֎ͳ৘ใΛఏڙ͢Δ͜ͱʹΑΔར༻ऀͷຬ଍౓ͷ޲্͕໨త
• ར༻ऀ͕ݟͨ͜ͱͳ͍࡞඼Λఏࣔ͢Δ͜ͱ͕ҙ֎ੑͷ৚݅ͱͯ͠ॏཁ
• ك᧵඼͸࡞඼ू߹ͷయܕతͳ࡞඼ʹൺ΂਺͕গͳ͘ɺଟ͘ͷਓ͕໨ʹ͍ͯ͠ͳ
͍Մೳੑ͕ߴ͍
12
ك᧵඼ݕग़ͷؔ࿈ݚڀᶃ
ҙ֎ੑΛॏࢹͨ͠ਪનख๏ʹΑͬͯɺ࡞඼ू߹ʹڞ௨͢ΔಛੑΛखಈͰݸผʹ
ٻΊͣك᧵඼Λݕग़Ͱ͖Δ
Kotkov, D., Wang, S. and Veijalainen, J.: A survey of serendipity in recommender systems, Knowledge-Based Systems, Vol. 111, pp. 180–192 (2016).

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• ར༻ऀͷධՁ͕ͳ͍࡞඼͸ݕग़ͷର৅֎
• ϋϯυϝΠυ࡞඼Λѻ͏CtoCͷECαΠτʹ͸೔ʑ৽͍͠࡞඼͕௥Ճ͞Εɺ͜
ΕΒͷ࡞඼ʹ͸ར༻ऀͷධՁ͕ͳ͍ظ͕ؒ͋Δ
• ӡӦऀ͸ൢചଅਐ΍ݕࡧੑͷ޲্ʹͭͳ͕Δ࡞඼Λޮ཰Α͘ଟ͘ൃݟ͍ͨ͠
13
ك᧵඼ݕग़ͷؔ࿈ݚڀᶃͷ՝୊
ར༻ऀͷධՁ͕ͳ͍࡞඼Λݕग़ର৅ʹؚΊΔ͜ͱ͕๬·͍͠

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• ౤ߘܕͷྉཧͷϨγϐαΠτ͔Β௝͍͠ϨγϐΛநग़͢Δख๏
• ͋Δྉཧʹ͸͋·Γར༻͞Εͳ͍͕ɺͦͷଞͷྉཧͰ͸සൟʹར༻͞ΕΔ৯ࡐ
ΛٻΊʢTF-IDFΛԠ༻ʣɺ͜ͷ৯ࡐ͔Β௝͍͠ϨγϐΛநग़͢Δ
• ྉཧΛ࡞඼ू߹ɺϨγϐΛ࡞඼ͱଊ͑Δ͜ͱͰك᧵඼ͷݕग़ʹԠ༻Մೳ
• ར༻ऀͷධՁ͸ඞཁͳ͍͕ɺݕग़ͨ͠ك᧵඼Λ༻్ผʹ෼ྨ͢Δ͜ͱ͕Ͱ͖ͳ͍
14
ك᧵඼ݕग़ͷؔ࿈ݚڀᶄͱͦͷ՝୊
ຊݚڀͰ͸ɺك᧵඼Λ༻్ผʹ෼ྨ͢Δج४΋ඞཁ
஑৲ګհ, ਗ਼༤Ұ, த઒ത೭, ాݪ߁೭, େਢլত඙: ҙ֎ੑͷ͋ΔϨγϐΛਪન͢ΔΤʔδΣϯτͷఏҊ, ిࢠ৘ใ௨৴ֶձ࿦จࢽ D, Vol. 98, No. 6, pp. 971–981 (2015).

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3.
ఏҊख๏

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1. ࡞඼ू߹ʹΑͬͯڞ௨͢Δಛੑ͕ҟͳΓك᧵඼ͷ൑அج४΋ҟͳΔ
ɹˠ ࡞඼ू߹ʹڞ௨͢ΔಛੑΛखಈͰݸผʹٻΊͳ͍΄͏͕๬·͍͠
2. ར༻ऀͷධՁ͕ͳ͍࡞඼͸ݕग़ର৅֎
ɹˠ ΑΓଟ͘ͷك᧵඼Λݕग़͢ΔͨΊʹɺະධՁͷ࡞඼΋ݕग़ର৅ͱ͢Δ
3. ك᧵඼Λ༻్ผʹ෼ྨ͢Δج४͕ͳ͍
ɹˠ ك᧵඼Λ༻్ผʹ෼ྨ͢Δج४Λݟग़͢
16
՝୊ͷ੔ཧ

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• ࡞඼ू߹ʹ͓͚Δ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷग़ݱස౓Λई౓ʹઃఆ͠ɺ͜
ͷई౓͕૬ରతʹ௿͍࡞඼Λك᧵඼ͱͯ͠ݕग़
• ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷग़ݱස౓ͷඪ४ภࠩΛ༻͍ͯك᧵඼Λ༻్ผʹ
෼ྨ
17
ఏҊख๏
୯ޠͷग़ݱස౓
ͷࢉग़
࡞඼ू߹ ك᧵඼ͷݕग़ ك᧵඼ͷ෼ྨ
ΧςΰϦؒҧ͍ͷ࡞඼
ར༻ऀͷධՁʹґଘ͠ͳ͍ ࡞඼ू߹ʹڞ௨͢ΔಛੑΛࣗಈͰٻΊΔ
෼ྨج४Λઃఆ

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• ࡞඼λΠτϧʹରͯ͠ܗଶૉղੳΛద༻͠୯ޠΛநग़
• ୯ޠͷग़ݱස౓ͷ௿͞Λද͢஋ͱͯ͠ɺTF-IDFʹ͓͚ΔIDFΛར༻
• IDF͸શจॻͷ͏ͪɺ͋Δ୯ޠؚ͕·ΕΔจॻ਺ͷٯ਺
• ࡞඼λΠτϧΛจॻͱͯ͠ద༻
18
࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷग़ݱස౓ͷࢉग़
Ndoc
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
ɿશจॻ਺
df(t)
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
ɿ୯ޠ͕ग़ݱ͢Δจॻ਺
t
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
IDF(t) = log
Ndoc
df(t)
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• ࡞඼ͷλΠτϧʹؚ·ΕΔ୯ޠͷIDFͷ্ҐN݅ͷ߹ܭΛ࡞඼ͷධՁ஋ͱͯ͠
ܭࢉ͠ɺධՁ஋͕ߴ͍࡞඼Λك᧵඼ͱͯ͠ݕग़
• N͸࡞඼͕΋ͭ୯ޠ਺ʹؔ܎ͳ͘࡞඼ͷධՁ஋ΛٻΊΔͨΊʹઃఆ
• ୯ޠ਺͕Nະຬͷ࡞඼͸ݕग़ͷର৅֎
19
ك᧵඼ͷݕग़
E(w)
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
ɿ࡞඼ɹͷධՁ஋
w
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
ɿ࡞඼ɹ͕࣋ͭ୯ޠू߹ɹʹ͓͍ͯ*%'͕ߴ͍୯ޠɹ݅
w
Tw
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
N
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
E(w) =
X
ti
2TOP(Tw,N)
IDF(ti)
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
TOP(Tw, N)
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• ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷIDFͷ܏޲ͷҧ͍ʹண໨
• ൢചଅਐͷޮՌ͕ߴ͍࡞඼͸ɺ࡞඼λΠτϧʹIDF͕ߴ͍୯ޠΛؚΈͭͭɺ
IDF͕௿͍୯ޠ΋ؚΜͰ͍Δ
• ΧςΰϦؒҧ͍ͷ࡞඼ʢݕࡧੑͷ޲্ʹར༻ʣ͸ɺ࡞඼λΠτϧͷຆͲͷ
୯ޠͷIDF͕ߴ͍
20
ك᧵඼ͷ෼ྨ
࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷ*%'ͷඪ४ภ͕ࠩେ͖͍΋ͷΛ
ൢചଅਐͷޮՌ͕ߴ͍࡞඼ͱͯ͠ݕग़

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21
ඪ४ภࠩͷҧ͍ͷྫ
ࡒ෍ͷ࡞඼ू߹ʹ͓͚ΔΧςΰϦؒҧ͍ͷ࡞඼
λΠτϧ ʲड஫੍࡞ʳύϥϑΟϯൕ෍ͷࢴାόοάੜ੒Γ
୯ޠ ड஫ ੍࡞ ύϥϑΟϯ ൕ෍ ࢴା όοά ੜ੒Γ
*%'
λΠτϧ ʰίɾνϟοϐʔʱɹϨΠχʔϑϩοάɹ͔͑Δϛχ΢ΥϨοτɹϛχࡒ෍
୯ޠ ίɾνϟοϐʔ ϨΠχʔϑϩοά ϛχ ΢ΥϨοτ ࡒ෍
*%'
ࡒ෍ͷ࡞඼ू߹ʹ͓͚ΔൢചଅਐͷޮՌ͕ߴ͍࡞඼

ඪ४ภࠩ
ඪ४ภࠩ

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4.
ධՁ

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• ك᧵඼ͱ୯ޠͷग़ݱස౓ͷؔ܎ੑ
• ࡞඼ͷධՁ஋ͷ্Ґʹك᧵඼͕Ґஔ͚ͮΒΕΔ͜ͱΛ֬ೝ
• ك᧵඼ͷ༻్ผͷ෼ྨ
• ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷIDFͷඪ४ภࠩʹΑͬͯɺك᧵඼Λ༻్ผʹ
෼ྨͰ͖Δ͜ͱΛ֬ೝ
23
ධՁ߲໨

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• minne ͔Βநग़ͨ͠࡞඼ू߹ʹରͯ͠ఏҊख๏Λద༻͠2ͭͷௐࠪΛ࣮ࢪ
• ࡞඼ू߹ɿ6909݅ʢࡒ෍ΧςΰϦɿ6904݅ɺόοάΧςΰϦɿ5݅ʣ
• ൢചଅਐͷޮՌ͕ߴ͍࡞඼ͷྫͱͯ͠ɺminneͷӡӦऀ͕खಈͰൃݟͯ͠ 
αΠτ্Ͱ঺հ͍ͯ͠Δ࡞඼Λ5݅ΛؚΉ
• ΧςΰϦؒҧ͍ͷ࡞඼ͷྫͱͯ͠ɺόοάΧςΰϦͷ࡞඼Λ5݅ΛؚΉ
• ͜ΕΒ10݅Λك᧵඼ͷྫʹઃఆ
24
ك᧵඼ͱ୯ޠͷग़ݱස౓ͷؔ܎ੑ
NJOOF͸(.0ϖύϘגࣜձ͕ࣾӡӦ͢ΔϋϯυϝΠυ࡞඼Λѻ͏&$αΠτ

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25
ௐࠪ1ɿධՁ஋ʹ͓͚Δك᧵඼ͷྫͷ෼෍
• ฏۉ஋͔Β࠷େ஋ʹ͔͚ͯك᧵඼ͷྫ͕෼෍
• ك᧵඼ͷྫ͕ൺֱతߴ͍ධՁ஋
• ฏۉ஋෇ۙʹك᧵඼
• 1୯ޠͷΈ͕௝͍͠୯ޠͰɺͦͷଞ͸සൟ
ʹར༻͞ΕΔ୯ޠͰߏ੒͞ΕΔ࡞඼
ఏҊख๏ʹΑͬͯٻΊͨධՁ஋ʹ͓͍ͯك᧵඼ͷྫ͕෼෍͢ΔҐஔΛ֬ೝ

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• ධՁ஋ͷ্Ґͷ΄͏͕ك᧵඼ͱ൑அͰ͖Δ࡞඼͕ଟ͍
26
ௐࠪ2ɿධՁ஋ͷ্ҐͱԼҐͷك᧵඼ͷׂ߹ͷൺֱ
্Ґ ԼҐ

ΧςΰϦؒҧ͍ͷ࡞඼

ك᧵඼ʢখܭʣ

ධՁ஋ͷ্ҐͱԼҐͷ࡞඼Λ໨ࢹͰ50݅ͣͭ֬ೝ͠ɺؚ·ΕΔك᧵඼ͷׂ߹ΛٻΊͨ

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• σʔληοτ͸ك᧵඼ͱ୯ޠͷग़ݱස౓ͷؔ܎ੑͷධՁͰར༻ͨ͠΋ͷͱಉ༷
• σʔληοτʹఏҊख๏Λద༻͠ɺ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷIDFͷඪ४
ภࠩΛٻΊɺك᧵඼ͷྫͷ෼෍Λ֬ೝ
27
ك᧵඼ͷ༻్ผͷ෼ྨ

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28
ඪ४ภࠩʹ͓͚Δك᧵඼ͷྫͷ෼෍
• ൢചଅਐͷޮՌ͕ߴ͍࡞඼ͱΧςΰϦؒҧ͍
ͷ࡞඼ͷ෼෍͕෼཭͢Δ܏޲͕͋Δ
• ্ҐʹൢചଅਐͷޮՌ͕ߴ͍࡞඼͕෼෍
ɹˠ ਪનʹར༻Մೳͱߟ͑ΒΕΔ

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5.
·ͱΊͱࠓޙͷ՝୊

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• ࡞඼ू߹ʹ͓͍ͯ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷग़ݱස౓Λई౓ͱͯ͠ɺ͜ͷ
ई౓͕૬ରతʹ௿͍࡞඼Λك᧵඼ͱͯ͠ݕग़͠ɺك᧵඼Λ༻్ผʹ෼ྨ͢Δख
๏ΛఏҊ
• ఏҊख๏ʹΑͬͯٻΊͨධՁ஋ͷ্Ґʹك᧵඼͕ଟؚ͘·ΕΔ͜ͱΛ֬ೝ
• ࡞඼λΠτϧʹؚ·ΕΔ୯ޠͷग़ݱස౓ͷඪ४ภࠩʹ͓͍ͯɺൢചଅਐͷޮՌ
͕ߴ͍࡞඼ͱΧςΰϦؒҧ͍ͷ࡞඼͕෼཭͢Δ܏޲Λ֬ೝ
30
·ͱΊ

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• ࡞඼ͷධՁ஋ͷܭࢉʹඪ४ภࠩΛ૊ΈࠐΉ͜ͱͰɺൢചଅਐͷޮՌ͕ߴ͍࡞඼
ͷݕग़ਫ਼౓Λ޲্
• ࣮؀ڥʹ͓͍ͯɺൢചଅਐͷޮՌ͕ߴ͍࡞඼Λਪનʹར༻ͨ͠৔߹ͷޮՌΛධ
Ձ
31
ࠓޙͷ՝୊

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ハンドメイド作品を対象としたECサイトにおける単語の出現頻度を用いた稀覯品の検出 / Detection of Rare Works Using Term Frequency on Electronic Commerce Site for Trading Handmade Works

ハンドメイド作品を対象としたECサイトにおける単語の出現頻度を用いた稀覯品の検出 / Detection of Rare Works Using Term Frequency on Electronic Commerce Site for Trading Handmade Works

Komei Nomura

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