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1.
《Information processing & management》2020,57(2):102056
Identifying and extracting user communities is an important step towards understanding social network dynamics from a macro perspective. For this reason, the work in this paper explores various aspects related to the identification of user communities. To date, user community detection methods employ either explicit links between users (link analysis), or users’ topics of interest in posted content (content analysis), or in tandem. Little work has considered temporal evolution when identifying user communities in a way to group together those users who share not only similar topical interests but also similar temporal behavior towards their topics of interest. In this paper, we identify user communities through multimodal feature learning (embeddings). Our core contributions can be enumerated as (a) we propose a new method for learning neural embeddings for users based on their temporal content similarity; (b) we learn user embeddings based on their social network connections (links) through neural graph embeddings; (c) we systematically interpolate temporal content-based embeddings and social link-based embeddings to capture both social network connections and temporal content evolution for representing users, and (d) we systematically evaluate the quality of each embedding type in isolation and also when interpolated together and demonstrate their performance on a Twitter dataset under two different application scenarios, namely news recommendation and user prediction. We find that (1) content-based methods produce higher quality communities compared to link-based methods; (2) methods that consider temporal evolution of content, our proposed method in particular, show better performance compared to their non-temporal counter-parts; (3) communities that are produced when time is explicitly incorporated in user vector representations have higher quality than the ones produced when time is incorporated into a generative process, and finally (4) while link-based methods are weaker than content-based methods, their interpolation with content-based methods leads to improved quality of the identified communities. 相似文献
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《Information processing & management》2020,57(6):102353
In this paper, we focus on the problem of discovering internally connected communities in event-based social networks (EBSNs) and propose a community detection method by utilizing social influences between users. Different from traditional social network, EBSNs contain different types of entities and links, and users in EBSNs have more complex behaviours. This leads to poor performance of the traditional social influence computation method in EBSNs. Therefore, to quantify the pairwise social influence accurately in EBSNs, we first propose to compute two types of social influences, i.e., structure-based social influence and behaviour-based social influence, by utilizing the online social network structure and offline social behaviours of users. In particular, based on the specific features of EBSNs, the similarities of user preference on three aspects (i.e., topics, regions and organizers) are utilized to measure the behaviour-based social influence. Then, we obtain the unified pairwise social influence by combining these two types of social influences through a weight function. Next, we present a social influence based community detection algorithm which is referred to as SICD. In SICD, inspired by the nonlinear feature learning ability of the autoencoder, we first devise a neighborhood based deep autoencoder algorithm to obtain nonlinear community-oriented latent representations of users, and then utilize the k-means algorithm for community detection. Experimental results conducted on real-world dataset show the effectiveness of our proposed algorithm. 相似文献
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[目的/意义] 构建基于用户兴趣标签的网络社团识别模型（Fuzzy Interests and User Hybrid Model,FIUHM）,揭示用户兴趣与社团形式概念间的模糊层级关系,实现多粒度属性与社团拓扑结构的层次聚类。[方法/过程] 通过抽取豆瓣电影社区数据,实现基于用户标签的兴趣强度语义标注,利用用户相似度,获取社区用户间兴趣语义距离;将网络社区的领接矩阵映射为社团形式背景,构建社团模糊概念格,建立社团形式概念及其偏序关系集,完成社团形式概念建模;通过计算社团稳定指数,识别网络社团边界,并聚类最大独立社团,实现兴趣社团的在线检测。[结果/结论] 通过对比实验,验证了FIUHM模型的有效性,实验表明将模糊形式概念分析引入网络社团识别研究,利用模糊概念格的偏序关系建模用户节点间的兴趣相似度,有利于提高社团识别的分辨率。 相似文献
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《Information processing & management》2020,57(2):102053
Local community detection is an emerging topic in network analysis that aims to detect well-connected communities encompassing sets of priorly known seed nodes. In this work, we explore the similar problem of ranking network nodes based on their relevance to the communities characterized by seed nodes. However, seed nodes may not be central enough or sufficiently many to produce high quality ranks. To solve this problem, we introduce a methodology we call seed oversampling, which first runs a node ranking algorithm to discover more nodes that belong to the community and then reruns the same ranking algorithm for the new seed nodes. We formally discuss why this process improves the quality of calculated community ranks if the original set of seed nodes is small and introduce a boosting scheme that iteratively repeats seed oversampling to further improve rank quality when certain ranking algorithm properties are met. Finally, we demonstrate the effectiveness of our methods in improving community relevance ranks given only a few random seed nodes of real-world network communities. In our experiments, boosted and simple seed oversampling yielded better rank quality than the previous neighborhood inflation heuristic, which adds the neighborhoods of original seed nodes to seeds. 相似文献
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【 目的/意义】在突发公共卫生事件情境下面向在线健康社区用户画像与分群,有助于提升社区服务质量,为
拓宽互联网疫情风险感知渠道作出贡献。【方法/过程】以“COVID-19”为例,结合社区数据特点从用户基本特征、
用户兴趣主题、情感倾向、用户问诊需求和用户交互网络角色五个角度出发构建画像标签并利用DBSCAN聚类实
现画像,根据画像结果呈现用户概貌;利用 AP算法在画像基础上实现用户分群,通过社会网络分析找到最具疫情
风险发现价值的用户类群。【结果/结论】实例分析表明,本文所构建的模型能够有效生成在线健康社区用户画像,
画像可以对社区用户进行概括、映射用户原貌;分群结果呈现出5类社区用户群：患者、疑似患者、医师、奉献者和社
区管理员;社会网络分析表明最具疫情风险发现价值的用户群体为疑似患者和奉献者。【创新/局限】实例分析数据
量尚达不到“大数据”标准,画像构建粒度仍有继续提升的空间。 相似文献
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社会标签系统是Web2.0中提出的概念,旨在更好地表达用户的兴趣和意愿。而标签聚类是社会标签系统的个性化推荐中一个重要的研究课题。本文研究了如何基于标签聚类与用户模型来进行个性化推荐的方法。通过计算标签的相似度进行标签聚类,结合用户模型,根据标签聚类结果做出推荐。通过采用CiteULike公布的数据集进行实验证明,与未采用标签聚类的推荐方法相比,本方法不仅可提高推荐的命中率,优化目标资源的排名,而且能为用户发现更多新的感兴趣的资源。 相似文献
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【目的/意义】通过对大数据环境下的多源用户兴趣特征有效融合,缓解个性化推荐中用户兴趣偏好数据的稀疏性和准确性问题。【方法/过程】考虑到多域的数据权威度、内容质量及体系结构的差异化较为明显,提出了基于多源用户标签的跨域兴趣融合模型,首先把多个域中的用户兴趣进行标签化处理,然后利用跨域用户识别和标签权重归一方法得到多个域的用户实体-标签矩阵,最后使用域权重影响系数对标签进行融合,构造具有复合权重的用户兴趣标签集。【结果/结论】使用5个来源数据域进行实验与分析,融合模型能够有效提高标签用户覆盖效果,在查全率不断提高的情况,融合域能够保持较高的标签用户查准率,有效提高用户兴趣特征的描绘效果。 相似文献
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同侪影响对用户贡献行为的作用研究———基于网络客观大数据的分析 《科学学研究》2021,39(12):2294-2304
本文将同侪影响引入在线创新社区的用户行为研究中,从广度和深度两方面考察同侪影响对用户贡献行为的影响,并分析感知收益的中介作用。研究以小米社区MIUI功能与讨论区的创意集市板块为对象构建S-O-R模型,采用6567名用户发布的8830条创意、5.26万条评论和收到的103.36万条评论数据,利用Mplus8.1分析检验,结果发现：同侪影响广度与深度均有利于促进用户贡献行为,综合收益在同侪影响广度、深度与用户贡献行为间起正向中介效应,情感收益仅在同侪影响广度、深度与主动贡献行为间起正向中介效应,而认知收益则在同侪影响深度与反应贡献行为间起负向中介效应。研究拓展了在线网络情境下知识管理与社会学领域的交叉研究,并为在线创新社区社交网络和知识管理提供重要启示。 相似文献
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【目的/意义】微博用户画像的精准构建,可有效识别用户的需求,提高个性化推荐的准确率。针对现有微
博用户画像构建方法对用户特征提取不全面、不准确的问题,本文提出了基于兴趣转移的用户画像构建方法。【方
法/过程】首先,依据层次分析法确定不同兴趣行为的权重,并将其用于修订兴趣词权重,获得用户的初始兴趣词
集;然后,依据生命周期理论获得用户兴趣行为周期,构建兴趣转移的时间衰减函数,实现对用户兴趣词集的动态
更新和叠加;最后,将用户的静态属性标签与基于兴趣转移的动态兴趣标签融合构建微博用户画像。【结果/结论】
实验采用从新浪微博爬取的真实数据作为数据集,实验结果显示：与已有微博用户画像构建方法相比,本文提出的
方法在个性化推荐中具有较好的性能。【创新/局限】创新点为：借鉴生命周期理论刻画微博用户兴趣行为周期,构
造兴趣转移的时间衰减函数,实现兴趣标签的动态更新。局限是未对静态属性标签的重要性进行界定,且未对存
在异常波动的兴趣行为曲线进行深入探讨。 相似文献
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[目的/意义]随着网络和社交媒体的发展,网络"意见领袖"在网络社区的信息传播和交流中发挥着越来越重要的作用,在社会生活的各个方面对网络民意产生巨大的影响。因此,识别网络"意见领袖",掌握其特征和规律成为了网络信息传播研究的重要方面。[方法/过程]在PageRank思想的基础上,利用文本的TF-IDF计算网络社区用户节点的连接强度,以此改进PageRank算法,提出一种LeaderRank方法用来评价网络社区用户节点的重要度,并结合其他指标及BP神经网络进行"意见领袖"的发现实验以及进一步的数据挖掘工作。[结果/结论]实验结果表明,该方法相较于神经网络具有更高的识别率,该方法可以灵活配合其他指标和方法使用,具有更好的适用性、扩展性和稳定性。 相似文献
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[目的/意义]分析通证知识社区的知识分享网络结构,有助于把握区块链背景下的虚拟社区知识分享和传播规律。[方法/过程]以国内通证知识社区代表——币乎网为研究对象,通过网络爬虫方式获取币乎用户样本数据,采用社会网络分析和内容分析方法,运用UCINET工具对社区用户的知识分享网络进行网络特征分析。[结果/结论]样本网整体呈现出小世界效应和无标度网络特征;中心性高的核心用户对社区知识贡献和传播的影响力较高;通证激励有助于挖掘社区中的优质内容。 相似文献
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《Information processing & management》2019,56(4):1204-1219
In the era of big data, it is extremely challenging to decide what information to receive and filter out in order to effectively acquire high-quality information, particularly in social media where large-scale User Generated Contents (UGC) is widely and quickly disseminated. Considering that each individual user in social network can take actions to drive the process of information diffusion, it is naturally appealing to aggregate spreading information effectively at the individual level by regarding each user as a social sensor. Along this line, in this paper, we propose a framework for effective information acquisition in social media. To be more specific, we introduce a novel measurement, the preference-based Detection Ability to evaluate the ability of social sensors to detect diffusing events, and the problem of effective information acquisition is then reduced to achieving social sensing maximization through discovering valid social sensors. In pursuit of social sensing maximization, we propose two algorithms to resolve the longstanding problems in traditional greedy methods from the perspectives of efficiency and performance. On the one hand, we propose an efficient algorithm termed LeCELF, which resolves the redundant re-evaluations in the traditional Cost-Effective Lazy Forward (CELF) algorithm. On the other hand, we observe the participation paradox phenomenon in the social sensing network, and proceed to propose a randomized selection-based algorithm called FRIENDOM to choose social sensors to improve the effectiveness of information acquisition. Experiments on a disease spreading network and real-world microblog datasets have validated that LeCELF greatly reduces the running time, whereas FRIENDOM achieves a better detection performance. The proposed framework and corresponding algorithms can be applicable in many other settings in resolving information overload problems. 相似文献
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《Information processing & management》2019,56(4):1565-1575
People who are suspected to suffer mental disorders often explore online communities to gather medical information. Such medical information benefits these people by facilitating self-diagnosis and social support for the mental disorders. At the same time, however, misinformation can aggravate mental disorders and worsen psychological status. Focusing on two representative mental illnesses, bipolar and depressive disorders, this study analyzed how users shared their experiences with illness and provided advice. Postings for bipolar and depressive disorders were gathered from subreddit communities and used for semantic network analysis. Results showed that users in both communities described sleep disorder episodes and financial problems with negative emotional expressions. Users in the bipolar disorder community showed more interest in the topic of medication, whereas users in the depressive disorder community were more interested in suicide issues. We discuss how these properties in the subreddit communities can be applied to understand user experiences of bipolar and depressive disorders. 相似文献
17.
Fattane Zarrinkalam Mohsen Kahani Ebrahim Bagheri 《Information processing & management》2018,54(2):339-357
Inferring users’ interests from their activities on social networks has been an emerging research topic in the recent years. Most existing approaches heavily rely on the explicit contributions (posts) of a user and overlook users’ implicit interests, i.e., those potential user interests that the user did not explicitly mention but might have interest in. Given a set of active topics present in a social network in a specified time interval, our goal is to build an interest profile for a user over these topics by considering both explicit and implicit interests of the user. The reason for this is that the interests of free-riders and cold start users who constitute a large majority of social network users, cannot be directly identified from their explicit contributions to the social network. Specifically, to infer users’ implicit interests, we propose a graph-based link prediction schema that operates over a representation model consisting of three types of information: user explicit contributions to topics, relationships between users, and the relatedness between topics. Through extensive experiments on different variants of our representation model and considering both homogeneous and heterogeneous link prediction, we investigate how topic relatedness and users’ homophily relation impact the quality of inferring users’ implicit interests. Comparison with state-of-the-art baselines on a real-world Twitter dataset demonstrates the effectiveness of our model in inferring users’ interests in terms of perplexity and in the context of retweet prediction application. Moreover, we further show that the impact of our work is especially meaningful when considered in case of free-riders and cold start users. 相似文献
18.
Innovation researchers have begun to look beyond how users develop tangible objects or product innovations and moved to investigate the existence and impact of intangible user-developed innovations in techniques and services in the household sector . In this paper, to incorporate technique and service innovations and other varieties of intangible innovations not yet described in the literature into an efficient and encompassing typology, we propose the new concept of intangible Behavioral Innovation as an overarching category that stands in contrast to tangible product innovation. Behavioral innovation is defined as consisting of one or a connected sequence of intangible problem-solving activities that provide a functionally novel benefit to its user developer relative to previous practice. We demonstrate in a pilot study using a relatively novel big data-gathering and semantic analysis approach that behavioral innovation exists and can be identified in user-generated content posted openly online in peer-to-peer discussion forums relating to household sector activities such as parenting. The preponderance (N = 138) of the 168 user innovations captured in our samples of discussion comments were intangible behavioral innovations, most of which were developed by women. The majority of behavioral innovations identified were diffused by their user developers in response to specific requests for help or advice from peers in their online community. Thus, incorporating the new concept of intangible behavioral innovation into studies of user innovation's scope and significance in the household sector can serve to clarify which users innovate in our communities of interest, what and how they innovate, why they are triggered to diffuse their innovations peer-to-peer, and how their innovative activities might impact social welfare. 相似文献
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【目的/意义】研究从用户节点和网络全局两个视角出发,基于用户相似度与信任度对虚拟学术社区中学者
进行推荐,提高学者推荐的质量。【方法/过程】首先,利用 LDA 主题模型挖掘学者发表的博文主题,计算博文相似
度;通过学者共同好友比例计算好友相似度;然后将博文相似度和好友相似度融合计算用户相似度;最后,融合用
户相似度和信任度进行学者推荐。【结果/结论】提出虚拟学术社区中基于用户相似度与信任度的学者推荐方法,综
合利用用户节点和网络全局信息,为虚拟学术社区用户进行学者推荐。【创新/局限】从用户节点和网络全局两个角
度进行学者信息融合,有效提高了虚拟学术社区中学者推荐的质量。局限在于本文主要考虑的是学者在网络全局
中的信任度,用户节点间的交互信任关系还有待进一步研究。 相似文献