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| Constructing a Global Backbone of Science Based on Inter-category Co-membership of Journals |
| Liu Yuxian |
| Tongji University Library, Tongji University, Shanghai 200092 |
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Abstract A journal can be assigned to different WoS (Web of Science) categories; hence, these WoS categories may have some journals in common. The topics contained in these common journals are different but related. Hence, the journal’s co-assignment to different WoS categories makes these categories related. We call this relationship “inter-category co-membership of journals.” The more journals the categories have in common, the more channels through which the categories can communicate and exchange, the more easily the relationship of the categories is established, and the sounder the base on which these categories form a subject clot. Based on this relationship, we use the WoS category as the basic unit to construct a backbone of science. VOSviewer’s mapping and clustering technique was used to determine the positions and clusters of WoS categories. The global map of sciences drawn by Leydesdorff and Rafols also uses the WoS category as a basic unit, but the inter-category citations were used to determine the relations. Principal-component analysis was used to cluster the categories, and the Kamada and Kawai algorithm was used for visualization. The maps, apparently, are different: the sciences are concentrated on one side and social sciences on the other in the global backbone of science drawn by the inter-category co-membership of journals. Based on inter-category citations, sciences and social sciences on the global map are trying to converge from two opposite sides, forming an irregularly circular shape. Considering the essential structure, we can see that both maps start from mathematics and computer science, which are then joined by engineering, physics, and chemistry; material science, agricultural science, and forestry; through geoscience and ecological sciences to bio-medicine; and through the public, environmental, and occupational health to the social sciences. Inter-category co-membership of journals is relatively stable, while the inter-category’s citation is mobile. The consensus and the difference may reflect the unity of the opposites of the stability and mobility of the scientific structure. They also reflect the logical structure of the two-relation frame.
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Received: 08 December 2017
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