Hawoong Jeong

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Despite its increasing role in communication, the world wide web (www) remains the least controlled medium: any individual or institution can create websites with unrestricted number of documents and links. This unregulated growth leads to a huge and complex web, which is a large directed graph, whose vertices are documents and edges are the links (URLs)(More)
Social networking services are a fast-growing business in the Internet. However, it is unknown if online relationships and their growth patterns are the same as in real-life social networks. In this paper, we compare the structures of three online social networking services: Cyworld, MySpace, and orkut, each with more than 10 million users, respectively. We(More)
Network generators that capture the Internet's large-scale topology are crucial for the development of efficient routing protocols and modeling Internet traffic. Our ability to design realistic generators is limited by the incomplete understanding of the fundamental driving forces that affect the Internet's evolution. By combining several independent(More)
initial conditions are gaussian, and is a potentially powerful signature to exploit in statistical tests of this class of models; see Fig. 1. The information needed to fully specify a non-gaussian field (or, in a wider context, the information needed to define an image) resides in the complete set of Fourier phases. Unfortunately, relatively little is known(More)
We study the statistical properties of the sampled scale-free networks, deeply related to the proper identification of various real-world networks. We exploit three methods of sampling and investigate the topological properties such as degree and betweenness centrality distribution, average path length, assortativity, and clustering coefficient of sampled(More)
Online social networking services are among the most popular Internet services according to Alexa.com and have become a key feature in many Internet services. Users interact through various features of online social networking services: making friend relationships, sharing their photos, and writing comments. These friend relationships are expected to become(More)
To identify communities in directed networks, we propose a generalized form of modularity in directed networks by presenting the quantity LinkRank, which can be considered as the PageRank of links. This generalization is consistent with the original modularity in undirected networks and the modularity optimization methods developed for undirected networks(More)