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Open Access

Public-private-core maintenance in public-private-graphs

School of Computer Science and Technology, Shandong University, Qingdao 266200, China
Department of Computer Science, Georgia State University, Atlanta, GA 30080, USA
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Abstract

A public-private-graph (pp-graph) is developed to model social networks with hidden relationships, and it consists of one public graph in which edges are visible to all users, and multiple private graphs in which edges are only visible to its endpoint users. In contrast with conventional graphs where the edges can be visible to all users, it lacks accurate indexes to evaluate the importance of a vertex in a pp-graph. In this paper, we first propose a novel concept, public-private-core (pp-core) number based on the k-core number, which integrally considers both the public graph and private graphs of vertices, to measure how critical a user is. We then give an efficient algorithm for the pp-core number computation, which takes only linear time and space. Considering that the graphs can be always evolving over time, we also present effective algorithms for pp-core maintenance after the graph changes, avoiding redundant re-computation of pp-core number. Extension experiments conducted on real-world social networks show that our algorithms achieve good efficiency and stability. Compared to recalculating the pp-core numbers of all vertices, our maintenance algorithms can reduce the computation time by about 6–8 orders of magnitude.

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Intelligent and Converged Networks
Pages 306-319
Cite this article:
Yu D, Zhang X, Luo Q, et al. Public-private-core maintenance in public-private-graphs. Intelligent and Converged Networks, 2021, 2(4): 306-319. https://doi.org/10.23919/ICN.2021.0022

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Received: 03 December 2021
Accepted: 18 January 2022
Published: 30 December 2021
© All articles included in the journal are copyrighted to the ITU and TUP.

This work is available under the CC BY-NC-ND 3.0 IGO license: https://creativecommons.org/licenses/by-nc-nd/3.0/igo/

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