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1 DEIM Forum 2017 D ( ) F This paper presents techniques of retrieving know-how sites from the collection of Web pages. The proposed techniques are designed to discover the maximum possible amount of know-how knowledge from such collections of Web pages, where know-how knowledge is defined as text contents qualified as information source regarding specific domain of questions. Techniques in this paper primarily collect sites, spanning multiple topics as know-how sites by classifying Web pages aggregated by a topic model. Collected sites are manually verified to counter check whether the sites are truly supplemental know-how knowledge. Collecting Know-How Sites based on the Topic Distribution per Site Jiaqi LI,ChenZHAO, Youchao LIN, Mizuho BABA,TakehitoUTSURO, Yasuhide KAWADA, and Noriko KANDO Grad. Sch. of Systems and Information Engineering, University of Tsukuba, Tsukuba Japan Faculty of Engineering, Information and Systems, University of Tsukuba, Tsukuba Japan Logworks Co., Ltd. Tokyo , Japan National Institute of Informatics, Tokyo , Japan 1. Yahoo! [4] [4] [4] ( )

2 30 2. Yahoo! 5 ( ) q d q q D q D q D q = {d 1 q,...,d k q } 1 3. Google 100 1,000 1 S s S AND N p P(s, N) N =20 D w [ D w = P(s, N) s S Yahoo! Search BOSS API 1 p s S(p) n fi fi o S(p) = s S fi p P(s,N) D q 3. D w D qw = D q [ Dw (LDA; Latent Dirichlet Allocation) [1] LDA w V w(w V ) K z n (n =1,...,K) w P (w z n)(w V ) d z n P (z n d) (n =1,...,K) d d D z n(n =1,...,K) D(z n) n fi fi o D(z n)= d D fi z n = argmax P (z u d) z u (u=1,...,k) 5. dm x z i z j (i = j) d d URL u(d) u(d ) dm(u(d)) dm(u(d )) dm x 2 dm x i j i = j d D(z i) d D(z j) dm(u(d)) = dm(u(d )) = dm x (1) 2 u(d) = u(d )= dm(u(d)) = dm(u(d )) =

3 1 11, ,211 24,587 35, ,409 49,835 14, ,144 25,203 2 A B C D E (1) dm x D q D w D qw D w K =50 30 i) ii) iii) iv) (a) (5. (1)) (b) 1 z i d d dm x z i z i i d d D(z i) d = d (2) dm(u(d)) = dm(u(d )) = dm x (c) 1 (a) (b) dm x 1 2 (a) (b) 1 (c) 1 10% D qw 51.5% D qw 49.8% A :

4 図 2 ノウハウサイト候補のドメインの評価結果 (クエリ フォーカス: 就活 結婚 およ び 花粉症 ) 図 3 ノウハウサイト候補のドメインの評価結果 (クエリ フォーカス: 就活 ) いては 著者らの主催により ほぼ同様の仕様で Task Mining 7. 関 連 研 究 Task も実施された 本研究においても Task Mining Task で 関連研究として [2] では クエリを実現するためのサブタス 用いられたクエリリストおよび評価手順 [3] のもとで 本論文 クの収集方式において 行為を表す動詞表現の形式を用いる方式 の提案手法を適用する方式の可能性を検討する必要があると考 注 3 を提案している 2014 年 12 月に開催された NTCIR-11 にお えられる ただし Task Mining Task のタスク設定では ク エリを実現するためのサブタスク群を動詞表現の形式で出力す 注 3 ることにとどまっており ノウハウ知識そのものは収集の対象

5 図 4 ノウハウサイト候補のドメインの評価結果 (クエリ フォーカス: 結婚 ) 図 5 ノウハウサイト候補のドメインの評価結果 (クエリ フォーカス: 花粉症 ) として扱われていない これに対して 本研究において収集 式によって収集されたドメインのうちの半数が有用なノウハウ の対象となるのは ウェブページ群の形式で表現されたノウハ サイトであるという結果が得られた ウサイトであり この点において上記の関連研究とは大きく異 なっている 8. お わ り に 本論文では あるクエリ フォーカスについて ウェブから ノウハウサイトを収集する手法として 検索エンジン サジェ ストを索引として収集したウェブページ文書集合に対して ト ピックモデルを適用し ドメインの単位を対象としてノウハウ サイトを収集する手法を提案した そして 各トピックの確率 上位 30 件のウェブページを対象とした場合において 提案方 文 献 [1] D. M. Blei, A. Y. Ng, and M. I. Jordan. Latent Dirichlet allocation. Journal of Machine Learning Research, Vol. 3, pp , [2] 加藤龍, 大島裕明, 山本岳洋, 加藤誠, 田中克己. タスクの汎化と 特化に着目した Web からのタスク検索. 第 6 回 DEIM フォー ラム論文集, [3] Y. Liu, R. Song, M. Zhang, Z. Dou, T. Yamamoto, M. Kato, H. Ohshima, and K. Zhou. Overview of the NTCIR-11 IMine task. In Proc. 11th NTCIR Workshop Meeting, pp. 8 23, [4] 守谷一朗, 井上祐輔, 今田貴和, 聶添, 宇津呂武仁, 河田容英, 神 門典子. 質問回答事例および検索エンジン サジェストを用いた ノウハウ知識の相補的収集. 第 7 回 DEIM フォーラム論文集,

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