Design and update of a classification system: the UCSD map of science.

Design and update of a classification system: the UCSD map of science.
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DOI:
10.1371/journal.pone.0039464
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Boyack KW
Boyack KW
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Börner K;Klavans R;Patek M;Zoss AM;Biberstine JR;Light RP;Larivière V;Boyack KW

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全球科学地图可以作为一个参考系统,绘制职业轨迹,新兴研究前沿的位置,或机构或国家的专业知识概况。本文详细介绍了数据准备,分析和布局时,设计和随后更新的UCSD科学和分类系统的地图。最初的分类和地图使用了Elsevier的Scopus(约15,000个源标题,2001-2005)和Thomson路透社的Web of Science(WoS)Science,Social Science,Arts & Humanities Citation Indexes(约9,000个源标题,2001-2004)中的720万篇论文及其参考文献-约16,000个独特的源标题。更新后的地图和分类增加了六年(2005-2010)的WoS数据和三年(2006-2008)的Scopus到现有的类别结构-将源标题的数量增加到约25,000个。据我们所知,这是第一次对广泛使用的科学地图进行更新。对最初的5年期和新的10年期地图和分类系统的比较表明:(i)可绘制地图的期刊总数增加了9,409种期刊(社会科学增加80%,人文科学增加119%,医学(32%)和自然科学(74%)),(ii)通过将除5种高度跨学科的期刊外的所有期刊分配给一个学科来简化地图,(iii)在计算变异系数时,期刊在554个子学科和13个学科中的分布更加均匀,和(iv)与论文级引文数据相比,更好地反映了期刊集群。当评估的地图与科学地图的理想功能的列表,更新后的地图被证明具有更高的映射精度,更容易理解,因为更少的期刊被多重分类,以及更高的可用性,用于生成数据覆盖,等等。
Global maps of science can be used as a reference system to chart career trajectories, the location of emerging research frontiers, or the expertise profiles of institutes or nations. This paper details data preparation, analysis, and layout performed when designing and subsequently updating the UCSD map of science and classification system. The original classification and map use 7.2 million papers and their references from Elsevier’s Scopus (about 15,000 source titles, 2001–2005) and Thomson Reuters’ Web of Science (WoS) Science, Social Science, Arts & Humanities Citation Indexes (about 9,000 source titles, 2001–2004)–about 16,000 unique source titles. The updated map and classification adds six years (2005–2010) of WoS data and three years (2006–2008) from Scopus to the existing category structure–increasing the number of source titles to about 25,000. To our knowledge, this is the first time that a widely used map of science was updated. A comparison of the original 5-year and the new 10-year maps and classification system show (i) an increase in the total number of journals that can be mapped by 9,409 journals (social sciences had a 80% increase, humanities a 119% increase, medical (32%) and natural science (74%)), (ii) a simplification of the map by assigning all but five highly interdisciplinary journals to exactly one discipline, (iii) a more even distribution of journals over the 554 subdisciplines and 13 disciplines when calculating the coefficient of variation, and (iv) a better reflection of journal clusters when compared with paper-level citation data. When evaluating the map with a listing of desirable features for maps of science, the updated map is shown to have higher mapping accuracy, easier understandability as fewer journals are multiply classified, and higher usability for the generation of data overlays, among others.
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发表时间: 2009-04-01
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影响因子: 3.9
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