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          <dc:title>ウェブ検索ログを用いたラベル伝播による意味カテゴリ獲得</dc:title>
          <dc:title xml:lang="en">Learning Semantic Categories from Web Search Logs Using Label Propagation</dc:title>
          <jpcoar:creator>
            <jpcoar:creatorName>小町, 守</jpcoar:creatorName>
            <jpcoar:creatorName>牧本, 慎平</jpcoar:creatorName>
            <jpcoar:creatorName>内海, 慶</jpcoar:creatorName>
            <jpcoar:creatorName>颯々野, 学</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">Mamoru, Komachi</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="en">Shimpei, Makimoto</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="en">Kei, Uchiumi</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="en">Manabu, Sassano</jpcoar:creatorName>
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          <datacite:description descriptionType="Other">近年ウェブ検索が一般的になり，ウェブを用いた知識獲得の研究が盛んになってきている．検索ログはユーザのユーザの関心を反映した情報源であり，ターゲット広告や検索支援のための情報抽出源として注目を集めている．しかしながら，既存の検索クエリログを用いた意味カテゴリ学習の研究ではユーザが入力したクエリを用いることによるリソースの問題，ブートストラップに代表される手法の可搬性の問題，そしてウェブを対象にした大規模データに対する拡張性の問題，の 3 つの問題点があった．そこで，本研究では検索クリックスルーログを用いた高精度な意味カテゴリ獲得，そしてラベル伝播によるグラフ理論に基づく手法の提案，最後にMapReduceを用いた並列分散計算により，これらの問題を解決する．意味カテゴリ学習タスクにおいて検索クリックスルーログを用いた研究はこれまでになく，本研究では既存手法に比べ高精度・高再現率で意味カテゴリを獲得できることを示した．</datacite:description>
          <datacite:description descriptionType="Other">Recently knowledge acquisition from the web is actively studied as web search becomes widespead. Web search logs are getting much more attention than before for the purpose of information extraction for applications such as targeted advertisement and query suggestion. However, previous work has three problems: query logs of poor quality due to inherent variations of the users' input; portability issue resulted from machine learning method such as bootstrapping; and scalability issue for handling large amount of data extracted from the web. Thus, we propose to use web clickthrough logs for learning semantic categories at high precision; apply a graph theoretic label propagation method; and perform parallel and distributed computation using MapReduce. Our main contribution is the use of web clickthrough logs for the task of learning semantic categories, and we demonstrated it achieves higher precision and recall than previous work.</datacite:description>
          <dc:publisher xml:lang="ja">情報処理学会</dc:publisher>
          <datacite:date dateType="Issued">2009-05-14</datacite:date>
          <dc:language>jpn</dc:language>
          <dc:type rdf:resource="http://purl.org/coar/resource_type/c_18gh">technical report</dc:type>
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          <jpcoar:sourceIdentifier identifierType="NCID">AN10442647</jpcoar:sourceIdentifier>
          <jpcoar:sourceTitle>研究報告音声言語情報処理（SLP）</jpcoar:sourceTitle>
          <jpcoar:volume>2009-SLP-76</jpcoar:volume>
          <jpcoar:issue>9</jpcoar:issue>
          <jpcoar:pageStart>1</jpcoar:pageStart>
          <jpcoar:pageEnd>6</jpcoar:pageEnd>
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            <datacite:date dateType="Available">2011-05-14</datacite:date>
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