Based on the data of Twitter while a week after the Great East Japan Earthquake, this study analyzes the communications that use the hashtag at the time of the earthquake in order to make proposals towards the efficient use in the future. From the analysis of basic statistics and tendencies of tweets for announcement of new hashtags, it was clarified that defining official hashtag is efficient. Content analysis of the hashtag showed that most of hashtags have been used along the purpose, although it is necessary to distinguish between hashtags of supplies and relief. Furthermore, from the usage trends of municipalities' hashtags in disaster area, it was found that Twitter has been used in the disaster areas despite the poor communication infrastructure. Those results suggested that the promotion of local communication in such municipal level would be meaningful.

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　While R & D competition accelerates, the importance of understanding a promising research area at an early stage is increasing. But, most of promising research subjects is considered to reside in the interdisciplinary fusion areas, which are not yet established as a distinct discipline. To pursue the technique of grasping such promising interdisciplinary research area, in this paper, I propose the technique for grasping the scientific field with a higher granularity, and the technique for evaluating the interdisciplinarity of a researcher's academic portfolio.
　I used bibliometric method "co-citation" to evaluate proximity of content of academic writings, and constructed the network structure using paper as the node and similarity relationship as edge. By applying Newman algorithm to partition those networks, detailed research area is defined. Using this detailed research area distinction, evaluation of longitudinal analysis of the diversity and researcher's interdisciplinarity from their research portfolio are achieved.

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Institutional repositories (IR) collects, manages, and disseminates many research articles, thesises and university journals. Metadata attributes of these contents mainly consist of bibliographic information. This information is also made public at research databases or bibliography sites in other institutional websites. Ordinarily, this redundant information has been duplicated by individual users. The reusable metadata in IR helps the users to reduce the maintaining cost. Moreover, if a metadata attribute of a site can be customized, a flexibility of the site will become increased. We propose a new framework for managing metadata attribute of a repository system. The repository system manages only the basic bibliographic information as metadata; the user site manages the extended attributes outside of the repository, and publishes the contents, which are selected from the repository, with the expanded extra metadata. We also implement the framework as the system named SarabiWEKO. The system enables researchers to construct a private repository which manages specific metadata attribute at the outside the IR.

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[in Japanese]

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