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首页社交网络中流行度与相似性对持久性的影响:耦合效应与最优增长策略
社交网络中流行度与相似性对持久性的影响:耦合效应与最优增长策略
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本文主要探讨了节点流行度和相似度对社交网络持久性的影响,以及这种耦合效应在社交网络结构演化中的作用。网络健壮性是衡量网络抵抗故障和干扰能力的关键指标,而在社交网络中,个体的活跃度或持久性对于理解网络的稳定性至关重要。以往的研究往往侧重于静态预设网络结构上的持久性分析,而社交网络的实际动态则涉及新用户加入时引发的级联不活动,这导致网络结构随时间不断演变。 研究者通过构建协同进化模型来模拟三种不同的网络增长模式:首先,按照节点的流行度排序,即流行度优先增长模式;其次,根据节点间的相似性进行排序,即相似性优先增长模式;最后,采用随机策略,即均匀随机增长模式。模型揭示了一个有趣的现象:当节点具有较高的自发活动性,流行度优先的增长模式能够形成高度稳定的网络结构;然而,当节点自发活动性较低时,相似性优先的模式可能更有利于保持网络的持久性。 值得注意的是,一种复合增长模式被发现可以实现更高的持久性,即在短期内连续加入相似节点,并适时混合高流行度节点。这种结合策略表明,节点的活动不仅受到其自身在网络中的位置(即流行度)影响,还与其与其他节点的关联度(即相似性)紧密相关。因此,相似性在社交网络的持久性中扮演着不可或缺的角色,而合理地融合流行度和相似性可以进一步提升网络的稳定性。 这项研究深入剖析了社交网络中动态变化的节点特性与网络结构之间的关系,强调了节点活动的多样性对于网络健壮性的重要影响。这对于理解和设计更高效、更能抵御干扰的社交网络平台具有重要的理论价值和实践指导意义。未来的研究可以进一步探索如何在实际应用中调整这些参数,以优化社交网络的性能和可持续性。
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1
Scientific RepoRts | 7:42956 | DOI: 10.1038/srep42956
www.nature.com/scientificreports
Coupling eect of nodes popularity
and similarity on social network
persistence
Xiaogang Jin
1
, Cheng Jin
1
, Jiaxuan Huang
1
& Yong Min
2
Network robustness represents the ability of networks to withstand failures and perturbations. In
social networks, maintenance of individual activities, also called persistence, is signicant towards
understanding robustness. Previous works usually consider persistence on pre-generated network
structures; while in social networks, the network structure is growing with the cascading inactivity of
existed individuals. Here, we address this challenge through analysis for nodes under a coevolution
model, which characterizes individual activity changes under three network growth modes: following
the descending order of nodes’ popularity, similarity or uniform random. We show that when nodes
possess high spontaneous activities, a popularity-rst growth mode obtains highly persistent networks;
otherwise, with low spontaneous activities, a similarity-rst mode does better. Moreover, a compound
growth mode, with the consecutive joining of similar nodes in a short period and mixing a few high
popularity nodes, obtains the highest persistence. Therefore, nodes similarity is essential for persistent
social networks, while properly coupling popularity with similarity further optimizes the persistence.
This demonstrates the evolution of nodes activity not only depends on network topology, but also their
connective typology.
Network robustness is one of the core issues in network science
1–4
. Early research mainly focuses on static robust-
ness, i.e. the resilience of network connectivity to random errors or targeted attacks of components like nodes
or edges
5–7
. Furthermore, dynamics robustness or network persistence, which concerns about the ability of a
network to maintain certain states or functions, received major attention
8
. For example, in high voltage networks,
cascading failure is a common eect, where a single point of failure on a fully loaded or slightly overloaded system
results in a sudden spike across nearly all nodes of the system
9,10
. In food-webs, extinction of a certain tropic spe-
cies may cause a threat to the balance of the food-web, and the persistence of food-webs can be measured as the
fraction of initial species remaining at the end of a perturbation
11–14
. Similarly, in social networks, maintaining
individual activity is a key issue towards the overall welfare of the community
15
.
e real social networks possess three particular features, each of which may aect persistence of individual
activity. Firstly, diverse network growth modes. Social networks may grow under various modes like following
celebrities
16,17
, sharing the same hobbies
18,19
or uniformly random ways. Attraction comes from nodes popular-
ity or similarity
20
, and the heterogeneous node and link types may change network persistence even under the
same network structure
21,22
. Secondly, the cascading eects, i.e. inactivation of a node may cause its neighbors
turn inactive. Concepts like k-core and k-core decomposition are adopted to understand the function of network
structure on cascading eects in social networks
23–25
; besides, models initially describing cascading failures
26
in
power grids
7,9,27
or epidemic spreading
28,29
are reformed to understand dynamic cascading processes in social
networks, including rumor cascades
30,31
, inuence maximization
32–34
, viral marketing
35,36
, etc. irdly, unlike
power grids or stable food webs, the total number of nodes in social networks is in growth and the node state is
also changing
37,38
; however, the eect of the coevolution process brings to network persistence remains unclear.
erefore, social network persistence is an interesting and open issue.
Here, based on the three features in social networks, we integrate Papadopoulos’s
20
network growth model and
k-core
39
based cascading processes, which can characterize the coevolution of network growth with diverse
modes and the cascading process of node states. To display multiple growth modes of social networks, the
extended model contains four steps (See Fig.1). (1) generate n nodes under polar coordinates each with two
1
Institute of Articial Intelligence, College of Computer Science, Zhejiang University, Hangzhou, 310027, China.
2
College of Computer Science, Zhejiang University of Technology, Hangzhou, 310023, China. Correspondence and
requests for materials should be addressed to Y.M. (email: myong@zjut.edu.cn)
received: 04 October 2016
accepted: 17 January 2017
Published: 21 February 2017
OPEN
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