英文标题：
《Hierarchical communities in the walnut structure of the Japanese
production network》
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作者：
Abhijit Chakraborty, Yuichi Kichikawa, Takashi Iino, Hiroshi Iyetomi,
Hiroyasu Inoue, Yoshi Fujiwara, Hideaki Aoyama
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最新提交年份：
2018
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英文摘要：
This paper studies the structure of the Japanese production network, which includes one million firms and five million supplier-customer links. This study finds that this network forms a tightly-knit structure with a core giant strongly connected component (GSCC) surrounded by IN and OUT components constituting two half-shells of the GSCC, which we call a\\textit{walnut} structure because of its shape. The hierarchical structure of the communities is studied by the Infomap method, and most of the irreducible communities are found to be at the second level. The composition of some of the major communities, including overexpressions regarding their industrial or regional nature, and the connections that exist between the communities are studied in detail. The findings obtained here cause us to question the validity and accuracy of using the conventional input-output analysis, which is expected to be useful when firms in the same sectors are highly connected to each other.
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中文摘要：
本文研究了日本生产网络的结构，包括100万家公司和500万个供应商-客户链接。这项研究发现，该网络形成了一个紧密结合的结构，核心巨强连接组件（GSCC）被构成GSCC两个半壳的内外组件包围，由于其形状，我们称其为核桃结构。利用Infomap方法研究了社区的层次结构，发现大多数不可约社区处于第二层次。详细研究了一些主要社区的组成，包括其工业或区域性质的过度表达，以及社区之间存在的联系。这里获得的结果使我们对使用传统投入产出分析的有效性和准确性提出质疑，当同一部门的企业彼此高度关联时，传统投入产出分析预计会有用。
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分类信息：

一级分类：Physics 物理学
二级分类：Physics and Society 物理学与社会
分类描述：Structure, dynamics and collective behavior of societies and groups (human or otherwise). Quantitative analysis of social networks and other complex networks. Physics and engineering of infrastructure and systems of broad societal impact (e.g., energy grids, transportation networks).
社会和团体（人类或其他）的结构、动态和集体行为。社会网络和其他复杂网络的定量分析。具有广泛社会影响的基础设施和系统（如能源网、运输网络）的物理和工程。
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一级分类：Quantitative Finance 数量金融学
二级分类：General Finance 一般财务
分类描述：Development of general quantitative methodologies with applications in finance
通用定量方法的发展及其在金融中的应用
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