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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Initial attractiveness ： ウィキペディア英語版 Initial attractiveness The initial attractiveness is a possible extension of the Barabási–Albert model (preferential attachment model). The Barabási–Albert model generates scale-free networks where the degree distribution can be described by a pure power law. However, the degree distribution of most real life networks cannot be described by a power law solely. The most common discrepancies regarding the degree distribution found in real networks are the high degree cut-off (or structural cut-off) and the low degree cut-off. The inclusion of initial attractiveness in the Barabási–Albert model addresses the low-degree cut-off phenomenon. == Definition == The Barabási–Albert model defines the following linear preferential attachment rule: $\backslash Pi\backslash left(k\_i\backslash right)=\backslash frac$. This would imply that the probability that a new node will attach to a node that has a zero degree is zero – $\backslash Pi(0)=0$. The preferential attachment function of the Barabási–Albert model can be modified as follows: $\backslash Pi(k)=A+k$. The constant $A$ denotes the initial attractiveness of the node. From this the preferential attachment rule with initial attractiveness comes as: : $\backslash Pi(k\_i)=\backslash frac$ Based on this attachment rule it can be inferred that: $\backslash Pi(0)\backslash sim\; A$. This means that even isolated nodes with $\backslash Pi(0)$ have a chance to obtain connections with the newly arriving nodes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Initial attractiveness」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.