R, Scientometrics, Knowledge Management, and Social Network Analysis

International Mechanics Collaboration in 30 Countries

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Published in: Proceedings International Workshop on Webometrics, Informetrics and Scientometrics & Seventh COLLNET
Authors: Lixin, Chen and Zeyuan, Liu
Affiliation: Dalian University of Technology, the 21st Century Development Research Center, Dalian 116024, the People’s Republic of China

Chen and Liu (2006) examined the international collaboration in the field of mechanics among authors in different countries using the social network analysis perspective. 168,689 mechanics-related articles in 106 journals from 1945 to 2003 were collected from the Science Citation Index-Expanded Database. The authors of the articles were from 150 countries, but only the collaborations among 30 most productive countries were analysed, which was ranked based on the number of the first-authors.

Based on the publication data of the 30 most productive countries, a non-symmetrical collaboration matrix was constructed with the rows representing first-author’s countries and the columns representing non first-author’s countries. The diagonal of the collaboration matrix was not given any value.

Chen and Liu identified the 6 most productive countries, namely USA, UK, Japan, France, Germany and China. These 6 countries accounted for 66.8% of the 88.891 publications from the top 30 countries, and 58.37% of 18,660 collaborations among the 30 countries. There were 666 different pairs of collaborations among the 900 possible collaborations. This means that the density of the network is 0.74.

The degree centrality, which is the number of direct connections each node has, was also identified. Only the top 6 countries had a degree centrality of at least 7 led by USA with 26, UK with 18, Germany with 16, France with 14, and both China and Japan with 7 degree centralities.

Finally, Chen and Liu divided the 30 countries into 4 regions, namely Europe, North America, Asia, and other. They found that European countries had a tendency to collaborate with other European countries, which accounted for more than half of the European countries’ collaborations and 26.7% of total collaborations. The percentage of collaborations by European countries was the highest compared to other regions’ collaborations. However, they were not the most productive region; North America was the highest with 39% (35% by USA).

Chen and Liu finally concluded that USA was the most important node in the network and European countries led by United Kingdom, Germany, and French played important roles in the international collaboration in the field of mechanics.


Written by Mathias

May 1, 2007 at 11:00 pm

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