共查询到20条相似文献，搜索用时 15 毫秒
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近年来社交媒体越来越流行,可以从中获得大量丰富多彩的信息的同时,也带来了严重的"信息过载"问题.推荐系统作为缓解信息过载最有效的方法之一,在社交媒体中的作用日趋重要.区别于传统的推荐方法,社交媒体中包含大量的用户产生内容,因此在社交媒体中,通过结合传统的个性化的推荐方法,集成各类新的数据、元数据和清晰的用户关系,产生了各种新的推荐技术.总结了社交推荐系统中的几个关键研究领域,包括基于社会化标注的推荐、组推荐和基于信任的推荐,之后介绍了在信息推荐中考虑时间因素时的情况,最后对社交媒体中信息推荐有待深入研究的难点和发展趋势进行了展望. 相似文献
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Web-based communication via social networking sites has become an integral method of communication, raising the question of whether the well-established Attachment Theory remains applicable to modern relationships. This communication shift is also likely to affect the information dissemination dynamic; i.e., how internal attachment working models relate to virtual modes of communication. Three studies (354 participants in total, median age 27) examined the applicability of Attachment Theory to web-based social network communications. Using self- report measures (Study 1) and an experimental simulation (Study 2), the results indicate that attachment security level predicts an individual’s number of social ties and willingness to initiate web-based relationships. Secure individuals emerged as best situated to become social hubs. Study 3 reveals that a decrease in avoidance scores predicts an increased willingness to deliver information to others. Anxious participants exhibited less willingness to deliver highly threatening information but more willingness to deliver neutral information to others.These findings support the applicability of attachment internal working models to predicting web-based social network communication, and suggest that Attachment Theory can be a predictor of the dynamics of web-based dissemination of information. 相似文献
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Christian Reuter Stefan Stieglitz Muhammad Imran 《Behaviour & Information Technology》2020,39(3):241-251
ABSTRACTThe growing importance of social media in conflicts and crises is accompanied by an ever-increasing research interest in the crisis informatics field in order to identify potential benefits and develop measures against the technology’s abuse. This special issue sets out to give an overview of current research on the use of social media in conflicts and crises. In doing so, it focuses on both good and malicious aspects of social media and includes a variety of papers of conceptual, theoretical and empirical nature. In six sections, the special issue presents an overview of the field, analytical methods, technical challenges, current advancements and the accepted papers before concluding. Specific topics range from cyber deception over information trustworthiness to mining and near-real-time processing of social media data. 相似文献
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There is growing evidence that social media addiction is an evolving problem, particularly among adolescents. However, the absence of an instrument measuring social media addiction hinders further development of the research field. The present study, therefore, aimed to test the reliability and validity of a short and easy to administer Social Media Disorder (SMD) Scale that contains a clear diagnostic cut-off point to distinguish between disordered (i.e. addicted) and high-engaging non-disordered social media users.Three online surveys were conducted among a total of 2198 Dutch adolescents aged 10 to 17. The 9-item scale showed solid structural validity, appropriate internal consistency, good convergent and criterion validity, sufficient test-retest reliability, and satisfactory sensitivity and specificity. In sum, this study generated evidence that the short 9-item scale is a psychometrically sound and valid instruments to measure SMD. 相似文献
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Marc‐Andr Kaufhold Alexis Gizikis Christian Reuter Matthias Habdank Margarita Grinko 《突发事故与危机管理杂志》2019,27(3):198-213
Social media have been established in many natural disasters or human‐induced crises and emergencies. Nowadays, authorities, such as emergency services, and citizens engage with social media in different phases of the emergency management cycle. However, as research in crisis informatics highlights, one remaining issue constitutes the chaotic use of social media by citizens during emergencies, which has the potential to increase the complexity of tasks, uncertainty, and pressure for emergency services. To counter these risks, besides implementing supportive technology, social media guidelines may help putting artefact and theoretical contributions into practical use for authorities and citizens. This paper presents the design and evaluation (with 1,024 participants) of citizens’ guidelines for using social media before, during, and after emergencies. 相似文献
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Peter Brusilovsky Jung Sun Oh Claudia López Denis Parra Wei Jeng 《New Review of Hypermedia and Multimedia》2017,23(2):81-111
This paper investigates the feasibility of maintaining a social information system to support attendees at an academic conference. The main challenge of this work was to create an infrastructure where users’ social activities, such as bookmarking, tagging, and social linking could be used to enhance user navigation and maximize the users’ ability to locate two important types of information in conference settings: presentations to attend and attendees to meet. We developed Conference Navigator 3, a social conference support system that integrates a conference schedule planner with a social linking service. We examined its potential and functions in the context of a medium-scale academic conference. In this paper, we present the design of the system’s socially enabled features and report the results of a conference-based study. Our study demonstrates the feasibility of social information systems for supporting academic conferences. Despite the low number of potential users and the short timeframe in which conferences took place, the usage of the system was high enough to provide sufficient data for social mechanisms. The study shows that most critical social features were highly appreciated and used, and provides direction for further research. 相似文献
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针对目前入侵检测系统存在的海量重复告警、误报率偏高、告警质量低下等问题,提出一种基于信息熵的IDS告警预处理方法,用于减少误告警,聚合相似告警,生成代表单步攻击意图的超告警。首先,对IDS告警进行特征提取,用告警密度、告警周期值、源IP对应的目的IP数与攻击源威胁度这4个特征的信息熵融合结果表示一条告警所具有的特征信息量。通过与误告警的特征向量进行互雷尼信息熵的计算,从而识别出误告,并且去除误告。然后对误告去除后的告警按照IP对应关系,划分为2类：一种源IP对应一种目的IP的告警以及一种源IP对应多种目的IP的告警。分别对2类告警进行特征统计,构造5维特征信息熵向量,采用DBSCAN算法将信息量相同或者相似的告警进行聚类。最后对各个类别的告警进行动态时间窗口划分,并构建出代表单步攻击意图的超告警。实验结果表明,基于信息熵的告警预处理方法误告去除率为87.43%,告警聚合率达到98.63%,具有较好的误告去除效果以及较高的告警聚合率。 相似文献
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董启明 《网络安全技术与应用》2013,(12):45-45,47
随着信息技术的发展,企业信息安全成为企业信息化建设的一个重要课题,信息安全问题直接关系到企业的信息化建设,从企业信息各个安全防护部位出发,阐述企业信息安全防护策略及注意事项,分析企业信息安全操作要点。 相似文献
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提出构建社会应急资源监测系统,建立信息系统对分布式的可应急社会资源进行监测,为资源筹募提供依据,提高社会资源的应急响应能力。分析监测系统的管理对象,建立其功能架构;设计社会应急资源的筹募机制,对可筹募资源进行评估;最后通过设计社会应急资源筹募流程说明筹募机制。针对社会应急资源参与应急救援的挑战,设计社会应急资源监测系统的结构和工作机制,为社会资源参与应急救援提供方法与系统,并为社会应急资源筹集优化、应急能力评价等问题的研究提供基础。 相似文献
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ABSTRACTDisasters present us with dynamic and emergent multi-stakeholder scenarios. Complex decision-making is supported by Emergency Management Organisation (EMO) ‘command and control’ disaster response systems that if pushed to failure, present problems in the development and monitoring of situational awareness. Nowhere is this more evident than when the general public use social media platforms to report crisis incidents when the official emergency management hotline (e.g. Triple Zero (000) in Australia) is overwhelmed or not available. This causes a number of issues for EMO as it is difficult to verify and determine the accuracy and veracity of social media posts and how to best incorporate the information within them into situational awareness for the assessment of and response to, an emergency incident. This paper analyses interview data from five Australian EMO that outlines and discusses these issues in detail. As a result of this analysis, we suggest that developing a supplementary ‘repertoires of collaboration’ approach to incorporating social media posts into the development of situational awareness during a disaster event, would help improve disaster response outcomes. We then recommend a way forward through the application of the Negotiated Arrangements for the Common Operating Picture (COP) in Extreme Events framework. 相似文献
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Xiangyu Hu Lemin Li Tingmin Wu Xiaoxiang Ai Jie Gu Sheng Wen 《Concurrency and Computation》2019,31(21)
Studying the influence of negative words that spread during election period is an important work in social media. Most of current methods rely on sentiment analysis of tweets to determine the users' preference. However, sentiment analysis can only makes use of emotional words (ie, adverbs and adjectives), which only take 30 percent of the context in the Internet. According to our empirical analysis based on real datasets, the bias on word selection largely reduced the accuracy of the context in the Internet. In order to address this critical problem, we propose a new method that makes use of nouns with emotional context to determine the election preference of each user. By collecting the frequencies of words in context, we weigh the impact of each supportive/objective noun to strengthen the determination of users' preference. Final results will further be integrated to examine the effectiveness and efficiency of our proposed method. To indicate this idea, we collect and adopt real datasets (UK Prime Minister 2017 and US President Campaign 2016) in the experiments. All the experiment results suggested that our integrated method largely outperformed previous prediction methods. In particular, the prediction results were quite similar to the final results of the UK and US election. Meanwhile, for UK election, we found that the daily approval rate is closely related to the event happened everyday. 相似文献
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《Information & Management》2016,53(7):904-914
Based upon the stressor-strain-outcome framework, this study proposes that perceived system feature overload, information overload, and social overload are stressors which induce strain, in terms of social network fatigue and dissatisfaction. Both of social network fatigue and dissatisfaction further influence discontinuous use intention. The empirical results indicate that three types of perceived overload exert greater effects on social network fatigue than dissatisfaction, both of which further increase users’ intention of discontinuance. The study also finds that demographic characteristics, such as gender and age, also have moderating effects on these relationships. 相似文献
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由于具有针对性的广告投放和个性化搜索等潜在应用,性别预测引起了巨大的研究兴趣。现有的大多数研究依赖于文本内容,而文本信息有时较难获取,从而使得文本特征很难被提取。对此,提出了一个新框架,该框架仅使用用户ID来对性别进行预测。该框架的关键在于在嵌入式连接空间中表示用户。提出两种策略来修改词嵌入技术,使其应用到用户嵌入当中。这两种策略分别是:1)序列化用户ID以获得社会关系的顺序;2)将用户嵌入大的上下文滑动窗口。在两个真实的新浪微博数据集上进行了广泛的实验,实验结果表明该方法显著优于目前最好的图形嵌入基线方法,其准确率也高于基于内容的方法。 相似文献
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基于国家水资源监控管理能力建设对突发水资源灾害事件的管理目标,结合现代计算机技术,开展水资源突发事件业务研究,进行水资源应急管理业务系统设计与开发,梳理形成一套具有一定通用性的水资源应急管理基本业务流程,并研发形成一个水资源应急管理系统软件。实例模拟处置应用表明,本研究成果具备复杂环境下水资源应急处置信息的组织与分析能力,基本适用于水资源应急管理。 相似文献
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李佳明 《自动化技术与应用》2011,30(7):34-37
本文利用现有的油山地理信息系统、生产调度管理系统、各单立现场视频监控及数据采集系统等信息资源,设计开发了油田应急管理信息平台,通过平台可实现及时预警,快速定位,信息共享,有效救援和重大危险源的实时监控.现场实际应用表明,本系统能够满足油田生产对应急管理的需求,从而确保油山生产秩序的平稳. 相似文献
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Yisheng Lv Yuanyuan Chen Xiqiao Zhang Yanjie Duan Naiqiang Li 《IEEE/CAA Journal of Automatica Sinica》2017,4(1):19-26
Recently, there has been an increased interest in the use of social media data as important traffic information sources. In this paper, we review social media based transportation research with social network analysis methods.We summarize main research topics in this field, and report collaboration patterns at levels of researchers, institutions, and countries, respectively. Finally, some future research directions are identified. 相似文献
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Jairo A. Gutiérrez Donald P. Sheridan R. Radhakrishna Pillai 《Journal of Network and Systems Management》2000,8(1):33-48
The increasing complexities of modern networks coupled with the popularity of multimedia applications have placed higher demands on network managers. This paper reviews the main requirements and challenges for effective management of multimedia networks, presents a case study of a thin-client-based multimedia system called CSL (Computer-supported Learning System) and proposes a framework for managing such networks. CSL delivers browser-based assessments and other learning materials to thousands of students at the University of Auckland. This type of demand requires more flexible schemes for the management of the network. In the framework proposed, most of the link management information will be kept in a MIB in the network and a very simple MIB will be maintained in the thin client. The MIB in the network is accessible to the network management application, and a lightweight protocol is proposed for updating of the network MIB using an agent at the thin client. 相似文献
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Gino Canella 《Digital Creativity》2017,28(1):24-37
ABSTRACTScholars and activists have studied social movement media for its potential to challenge dominant narratives, build community relationships and create social change. This paper presents a case study of two short-form documentary projects with Black Lives Matter 5280 and the Service Employees International Union, Local 105 in Denver, Colorado to explore how collaborative media-making projects assist in building local grassroots campaigns of racial and economic justice. The communication strategies as well as the distribution efforts via online social networks and community screenings are discussed in order to analyse how documentaries rely upon personal narratives to animate members and allies’ feelings and then connect them with traditional forms of organizing like community meetings and public demonstrations. The participatory aspects of filmmaking are viewed through democratic theory, which emphasizes the social relations of citizenship and shared communal values over material and cultural resources, rather than visual aesthetics or technical processes. 相似文献