Peer-to-Peer環境におけるユーザ間のインタラクションに基づく階層的知識の拡張手法  [in Japanese] Evolution of Concept Hierarchies through Interaction among Users in a Peer-to-peer Environment  [in Japanese]

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Author(s)

    • 佐藤 宏之 SATO HIROYUKI
    • 日本電信電話株式会社NTT情報流通プラットフォーム研究所 NTT Information Sharing Platform Laboratories, NTT Corporation
    • 杉本 重雄 SUGIMOTO SHIGEO
    • 筑波大学大学院図書館情報メディア研究科 Graduate School of Library, Information and Media Studies, University of Tsukuba

Abstract

情報リソースのメタデータの記述に利用する共通のボキャブラリの定義やオントロジをWeb 上に置いて,複数のユーザや組織の間で参照するための研究が進められている.本論文は,個別のユーザや組織によって生成され分散環境上に公開された階層的知識をユーザ間で参照して活用する方法について述べる.ここではオブジェクト指向の考えを利用して,情報リソースをインスタンスとしたときのクラスに相当する概念を定義し,概念を階層化して表現した階層的知識を扱っている.セマンティックWeb のフレームワークを利用して,概念と結びついた情報リソースに関するメタデータを記述し,それをPeer-to-Peer 環境で流通させることによって,他者が保持する階層的知識の発見を支援する方式を提案する.さらに,ユーザの「関わった情報を整理して保持したい」というモチベーションを利用して,自らのために行った活動から他者とのインタラクションを発生させ階層的知識を拡張するプロセスモデルを提案する.このプロセスを支援するシステムを用いた実験では,ユーザは自らが生成した階層的知識に他者の概念を引用したり,他者の概念との間の関係付けを行ったりして,階層的知識を拡張することが可能であることを確認した.また,拡張の際に強く関わりあう3~6 人のユーザの階層的知識を結合することで,ユーザ間で平均約71% の概念の引用や関係付けが類似するなどの特徴を持った新たな階層的知識の生成が確認できた.Many studies that have the goal of providing multiple users and organizations with Webbased common vocabularies or ontologies for use in describing metadata on informational resources are now under way. This paper describes a method that facilitates reference to and utilization of concept hierarchies evolved by individual users or organizations and made available in distributed environments. In the method we use an object-oriented paradigm to define resource-related concepts as classes, the instances of which represent resources. We set up these classes in a hierarchy that represents the hierarchy of concepts. We use the Semantic Web as a framework for a way to define metadata that reflects linkages between concepts and resources in a way that makes it easy for users to find associated concept hierarchies held by other users in a peer-to-peer environment. Moreover, we propose a model for the evolution of concept hierarchies through interaction among users. This process takes advantage of the motivation of users to organize information which they find relevant. We implemented the system and ran an experiment which demonstrating that hierarchies created by using the system evolve as the users refer to or make connections with concept hierarchies held by other users. We also identify an interesting feature of new concept hierarchies produced by applying the evolutionary process to merge concept hierarchies initially produced by sets of three to six "strongly related" users: actions common to the users make up an average of 71% of all actions (connection and reference) that lead to the evolution of new hierarchies.

Many studies that have the goal of providing multiple users and organizations with Web-based common vocabularies or ontologies for use in describing metadata on informational resources are now under way. This paper describes a method that facilitates reference to and utilization of concept hierarchies evolved by individual users or organizations and made available in distributed environments. In the method we use an object-oriented paradigm to define resource-related concepts as classes, the instances of which represent resources. We set up these classes in a hierarchy that represents the hierarchy of concepts. We use the Semantic Web as a framework for a way to define metadata that reflects linkages between concepts and resources in a way that makes it easy for users to find associated concept hierarchies held by other users in a peer-to-peer environment. Moreover, we propose a model for the evolution of concept hierarchies through interaction among users. This process takes advantage of the motivation of users to organize information which they find relevant. We implemented the system and ran an experiment which demonstrating that hierarchies created by using the system evolve as the users refer to or make connections with concept hierarchies held by other users. We also identify an interesting feature of new concept hierarchies produced by applying the evolutionary process to merge concept hierarchies initially produced by sets of three to six "strongly related" users: actions common to the users make up an average of 71% of all actions (connection and reference) that lead to the evolution of new hierarchies.

Journal

  • IPSJ journal

    IPSJ journal 46(1), 103-114, 2005-01-15

    Information Processing Society of Japan (IPSJ)

References:  23

Codes

  • NII Article ID (NAID)
    110002768519
  • NII NACSIS-CAT ID (NCID)
    AN00116647
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1882-7764
  • NDL Article ID
    7218394
  • NDL Source Classification
    ZM13(科学技術--科学技術一般--データ処理・計算機)
  • NDL Call No.
    Z14-741
  • Data Source
    CJP  NDL  NII-ELS  IPSJ 
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