Type
Article
Titre
Detecting global bridges in networks
Auteur(s)
JENSEN Pablo - Institut des Systèmes Complexes Rhône-alpes (Auteur)
MORINI Matteo - École normale supérieure - Lyon (ENS Lyon) (Auteur)
KARSAI Márton - École normale supérieure - Lyon (ENS Lyon) (Auteur)
VENTURINI Tommaso - Médialab (Auteur)
VESPIGNIANI Alessandro - Northeastern University [Boston] (Auteur)
JACOMY Mathieu - Médialab (Auteur)
COINTET Jean-Philippe - Médialab (Auteur)
MERCKLE Pierre - Sciences Po (Auteur)
FLEURY Eric - Laboratoire de l'Informatique du Parallélisme (LIP) (Auteur)
Éditeur
GB
ISSN
20511329
DOI
10.1093/comnet/cnv022
Résumé
EN
The identification of nodes occupying important positions in a network structure is crucial for the understanding of the associated real-world system. Usually, betweenness centrality is used to evaluate a node capacity to connect different graph regions. However, we argue here that this measure is not adapted for that task, as it gives equal weight to "local" centers (i.e. nodes of high degree central to a single region) and to "global" bridges, which connect different communities. This distinction is important as the roles of such nodes are different in terms of the local and global organisation of the network structure. In this paper we propose a decomposition of betweenness centrality into two terms, one highlighting the local contributions and the other the global ones. We call the latter bridgeness centrality and show that it is capable to specifically spot out global bridges. In addition, we introduce an effective algorithmic implementation of this measure and demonstrate its capability to identify global bridges in air transportation and scientific collaboration networks.
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