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Masatsura Igami
National Institute of Standards and Technology
8Publications
4H-index
30Citations
Publications 8
Newest
#1Masatsura Igami (NIST: National Institute of Standards and Technology)H-Index: 4
#2Ayaka Saka (NIST: National Institute of Standards and Technology)H-Index: 3
This study aimed to monitor the status of scientific research in Japan, especially the diversity of scientific research, based on in-depth analyses of science maps. Analyses of six consecutive maps showed decreasing diversity in Japanese science relative to benchmarking countries. We proposed a new concept for a Sci-GEO chart (representing geographical characteristics of research areas on a science map) that aims to classify research areas in terms of continuity and cognitive linkage. Based on t...
5 CitationsSource
#1Masatsura Igami (NIST: National Institute of Standards and Technology)H-Index: 4
#2Sadao Nagaoka (Hitotsubashi University)H-Index: 11
Last.John Walsii (Georgia Institute of Technology)H-Index: 30
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This study explores the prevalence of postdoctoral fellows in fast-moving and competitive scientific research. We use the results of a new and original large-scale survey of scientists in Japan and the United States for the analyses. Descriptive statistics show that, in both Japan and the United States: (1) the mean citation time lag was shorter by about 2 years in the highly cited papers (top 1 %) compared to other normal papers; and (2) the perceived degree of competitive threat was also highe...
4 CitationsSource
#1Masatsura IgamiH-Index: 4
#2Sadao NagaokaH-Index: 11
Last.John WalsiiH-Index: 30
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How to design and manage a research team has become an increasingly important issue in knowledge creation in science. This paper aims to understand how young scholars contribute to scientific research in the context of a research team. We have found that the likelihood of the involvement of postdoctoral fellows is high in research teams working on a rapidly advancing research theme, facing competitive threat, and in those research teams with foreign-born scholars and when exploiting advanced res...
#1Sadao NagaokaH-Index: 11
#2Masatsura IgamiH-Index: 4
Last.Tomohiro IjichiH-Index: 2
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4 Citations
#1John WalsiiH-Index: 30
#2Hsini HuangH-Index: 3
Last.Sadao NagaokaH-Index: 11
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#1Sadao NagaokaH-Index: 11
#2Masatsura IgamiH-Index: 4
Last.Tomohiro IjichiH-Index: 2
view all 4 authors...
11 Citations
サイエンスマップとは,注目を浴びている研究領域が,互いにどのような位置関係にあるのか(近いのか遠いのか,周辺にどのような研究があるのか)を示した科学研究の地図である。サイエンスマップは共引用分析を用いて論文のグループを生成した後,その位置関係を2次元平面にマッピングすることで作成される。共引用分析の利点は,論文グループを生成する際に,キーワードを用いない点である。頻繁に共に引用される論文のペアを作っていくことで,互いに何かしらの関係性がある論文のグループを生成する。これにより,科学研究全体を俯瞰できるようなマップの作成,科学の動的な変化の観測が可能となる。本稿では,まずサイエンスマップの作成手法について説明した後,サイエンスマップ2004と2006の比較から見える科学研究の変化について示す。また,サイエンスマップの応用例についても紹介する。
3 CitationsSource
#1Ayaka SakaH-Index: 3
#2Masatsura IgamiH-Index: 4
Last.Terutaka KuwaharaH-Index: 1
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3 Citations
1