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2011 11th IEEE International Conference on Data Mining
Finding Communities in Dynamic Social Networks
Chayant Tantipathananandh and Tanya Y. Berger-Wolf
Department of Computer Science
University of Illinois at Chicago
851 S Morgan St
Chicago, IL 60607
Email: {ctanr ti2, tanyabvv}@
Abstract—Communities are natural structures observed in consider the temporal aspect of the system of interactions.
social networks and are usually characterized as “relatively We call such a system of interactions a “dynamic network”
dense” subsets of nodes. Social networks change over time as opposed to a “static network.”
and so do the underlying community structures. Thus, to truly
uncover this structure we must take the temporal aspect of Recently, researchers have proposed many methods for
networks into consideration. Previously, we have represented identifying dynamic communities [5]. All such methods rely
framework for finding dynamic communities using the social on the notion of gradual change of community membership
cost model and formulated the corresponding optimization and some notion of persistence [2]. This line of research
problem [33], assuming that partitions of individuals into groups began with several methods that track, rather than infer,
are given in each time step. We have also presented heuristics
and approximation algorithms
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