'Can "Hot Spots" in the Sciences Be Mapped Using the Dynamics of Aggregated Journal-Journal Citation Relations?'

Loet Leydesdorff loet at LEYDESDORFF.NET
Tue Feb 3 10:02:40 EST 2015

Can  <http://arxiv.org/abs/1502.00229> "Hot Spots" in the Sciences Be Mapped
Using the Dynamics of Aggregated Journal-Journal Citation Relations?


Using three years of the Journal Citation Reports (2011, 2012, and 2013),
indicators of change are developed involving only changes of more than one
standard deviation above average. Two forms of change are distinguished:
monotonic increases or decreases of citation intensity (cited or citing) and
critical revisions of the a posteriori (2013) prediction in 2012 on the
basis of 2011 data. Changes can be studied at the level of journals using
the margin totals of entropy production along the row or column vectors, but
also at the level of links among groups of journals by importing the
transition matrices into network analysis and visualization programs (and
using community-finding algorithms). The latter analysis improves on the
former by being more fine-grained. Changes are found in the giant component
representing the major disciplinary structures; and significant changes at
the level of specialties are indicated in 52 components which are mostly on
the applied side of the sciences and engineering.


is now available at http://arxiv.org/abs/1502.00229 .




Loet Leydesdorff 

Emeritus University of Amsterdam
Amsterdam School of Communications Research (ASCoR)

 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.leydesdorff.net/> http://www.leydesdorff.net/ 
Honorary Professor,  <http://www.sussex.ac.uk/spru/> SPRU, University of

Guest Professor  <http://www.zju.edu.cn/english/> Zhejiang Univ., Hangzhou;
Visiting Professor,  <http://www.istic.ac.cn/Eng/brief_en.html> ISTIC,

Visiting Professor,  <http://www.bbk.ac.uk/> Birkbeck, University of London;



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