Volume 127, Number 5, September 2019
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||08 October 2019|
Formation mechanisms of local structures in language networks
1 Department of Information and Computer Sciences, Graduate School of Science and Engineering, Saitama University - 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama, 338-8570, Japan
2 Department of Management Science, Graduate School of Engineering, Tokyo University of Science 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
3 Department of Information and Computer Technology, Faculty of Engineering, Tokyo University of Science 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
4 International Research Center for Neurointelligence, The University of Tokyo - 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
Received: 15 March 2019
Accepted: 20 August 2019
The small-world property has recently been observed in several language networks generated in terms of word co-occurrence. However, a syntactic interpretation of this universal property has not yet been clarified. This study aims to reveal the formation mechanism of local structures involving small-world properties of co-occurrence language networks. We analyse local structures of language networks with directed edges generated from five different languages, where the directed edges provide word-order information. The results show that the following three syntactic properties play a leading role in the formation of the local structure of a language network: i) agglutination of words, ii) changes in the positions of words, and iii) basic word orders of languages. We further show that a common formation mechanism exists in local structures, even though the syntactic rules vary between the considered languages. These syntactic properties potentially drive the small-world property of language networks.
PACS: 64.60.aq – Networks / 89.75.-k – Complex systems / 05.90.+m – Other topics in statistical physics, thermodynamics, and nonlinear dynamical systems (restricted to new topics in section 05)
© EPLA, 2019
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