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Title: Degree distribution of large networks generated by the partial duplication model
Authors: Li, S.
Choi, K.P. 
Wu, T. 
Keywords: Computational proteomics
Degree distribution
Limiting behavior
Power law
Random graph
Issue Date: 11-Mar-2013
Citation: Li, S., Choi, K.P., Wu, T. (2013-03-11). Degree distribution of large networks generated by the partial duplication model. Theoretical Computer Science 476 : 94-108. ScholarBank@NUS Repository.
Abstract: In this paper, we present a rigorous analysis on the limiting behavior of the degree distribution of the partial duplication model, a random network growth model in the duplication and divergence family that is popular in the study of biological networks. We show that for each non-negative integer k, the expected proportion of nodes of degree k approaches a limit as the network becomes large. This fills in a gap in previous studies. In addition, we prove that p=1/2, where p is the selection probability of the model, is the phase transition for the expected proportion of isolated nodes converging to 1, and hence answer a question raised in Bebek et al. [G. Bebek, P. Berenbrink, C. Cooper, T. Friedetzky, J. Nadeau, S.C. Sahinalp, The degree distribution of the generalized duplication model, Theoret. Comput. Sci. 369 (2006) 239-249]. We also obtain asymptotic bounds on the convergence rates of degree distribution. Since the observed networks typically do not contain isolated nodes, we study the subgraph consisting of all non-isolated nodes contained in the networks generated by the partial duplication model, and show that p=1/2 is again a phase transition for the limiting behavior of its degree distribution.
Source Title: Theoretical Computer Science
ISSN: 03043975
DOI: 10.1016/j.tcs.2012.12.045
Appears in Collections:Staff Publications

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