共查询到20条相似文献，搜索用时 203 毫秒
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为有效评估复杂网络中节点的重要性,特提出了一种基于经典度排序方法的合度排序算法.合度排序算法是在节点度的基础上提出了邻度和合度的概念,通过计算每个节点的合度值来评估节点在网络中的重要性,即合度值越大,节点在网络中的重要性越高.并利用经典的度排序算法、接近度排序算法及新提出的合度排序算法对同一网络拓扑图的节点进行排序,证明了合度排序算法的有效性. 相似文献
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复杂网络中,识别有影响力的节点一直是一个重要的研究课题,备受学者的关注。本文提出了一种基于密度峰值聚类的中心性指标(Gam)来对整个网络中的节点进行排序。通过在实际网络上的实验结果表明,与已知的DC、BC、CC等中心性指标相比,Gam指标在不同的真实网络中表现优异。 相似文献
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节点选择机制是P2P网络的研究热点与核心技术,近年来得到广泛的关注.该文将一种改进的粒子群优化算法-具有双重结构编码的二进制粒子群优化算法（DS-BPSO）应用于P2P文件共享系统的邻居节点选择过程.在动态性方面,粒子群优化算法（PSO）与P2P网络具有先天的相似性.每个粒子（节点）通过有向图来编码与其它粒子的连接矩阵,更符合ADSL连接常规.实验结果表明：对于大规模的邻接选择问题,DS-BPSO算法通常会比二进制粒子群优化算法（BPSO）能够查找到更好的邻居节点. 相似文献
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本文通过分析研究CAN(Content-Addressable Network)语义路由算法,改进源节点到目的节点语义路由中继节点序列,从建立相应的P2P网络节点物理位置参照系入手,依据节点坐标问的相对距离,来自局部节点的物理邻居信息及最短路径,对OCAN路由性能进行理论分析及推导.OCAN算法既不修改原有P2P网络的nodeid的值,也不在网络中设置超级节点,在提高路由效率的同时,保证了网络节点的对等性. 相似文献
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提出一种基于弧覆盖的节点调度算法来控制无线传感器网络的密度问题.利用节点感知区域所覆盖到的弧是否被邻居节点完全覆盖来判定节点的状态,通过节点之间的状态轮换与合作策略来延长网络寿命.仿真证明该算法具有良好的节能性能,而且有效延长网络的生存寿命. 相似文献
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本文通过分析研究CAN(Content-Addressable Network)语义路由算法,改进源节点到目的节点语义路由中继节点序列,从建立相应的P2P网络节点物理位置参照系入手,依据节点坐标间的相对距离,来自局部节点的物理邻居信息及最短路径,对O-CAN路由性能进行理论分析及推导。OCAN算法既不修改原有P2P网络的nodeid的值,也不在网络中设置超级节点,在提高路由效率的同时,保证了网络节点的对等性。 相似文献
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微博客的信息传播模式及其发展分析 总被引：2，自引：0，他引：2
微博客由于其简单、快速、去中心化的传播方式赢得了许多用户的青睐,其影响力在现代社会日益得到彰显。微博客快速发展背后是,数量巨大的用户群体的推动。作为依靠用户产生内容的媒介形式其信息的传播影响力主要体现在用户扩散模式和信息传播模式上。虽然微博客以惊人的速度扩张,但在实际的发展中面对阻力也是多方面的。 相似文献
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黄力 《柳州职业技术学院学报》2007,7(2):107-111
移动IP技术的出现使移动用户在Internet的海洋里自由翱翔。为了安全起见,企业和家庭网络都采用防火墙安全策略。在没有取得授权的情况下,移动用户无法访问企业或家庭的网络,一定程度限制了移动用户对网络资源的获取。本文提出一套基于外部代理的移动IP安全穿越防火墙的解决方案,方案设置一个移动节点,该节点可以从外部代理中获得一个授权地址,通过该地址实现与其家乡代理和通信对端的通信,在不修改协议和网络实体的情况下,利用IPSec协议实现防火墙的安全穿越和端到端的安全通信。 相似文献
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雷鸣 《广东轻工职业技术学院学报》2008,7(4):5-6
针对移动通信业务中短信的应用中,大量的非法短信、垃圾短信的传播对社会安定和用户情绪有着较大的影响。为了提高GSM的网络安全,本文介绍一种通过监控A口的网络信息,从而实现对本地用户和外地用户的短信流量以及短信内容进行监控的系统。 相似文献
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This paper describes the use of an activity theory (AT) framework to analyze the ways that distance part time learners and mobile workers adapted and appropriated mobile devices for their activities and in turn how their use of these new tools changed the ways that they carried out their learning or their work. It is argued that there are two key strengths in using an activity theory framework in this context. The first strength is the emphasis activity theory places on tools, including computer artefacts, as mediators of activity. This emphasis focuses attention on the activity itself rather than, for example, simply the interaction between the human and the computer. The focus is on the learner or user’s objectives and activities and the computer is the tool through which the user achieves her objectives. The second strength was referred to briefly above. The AT perspective also enabled analysis of an interactive dynamic process of users or learners and their tools—in this case personal digital assistants (PDAs). It revealed a two way process in which the user adapts the tools they use according to their everyday practice and preferences in order to carry out their activities; and how, in turn, the tools themselves also modify the activities that the user is engaged in. Three case studies illustrate these processes. The first case study is of distance learners’ use of e‐books on PDAs, to supplement their access to other static media such as books and computers. The second case study investigated how mobile workers in the energy industry used mobile devices to access information when away from the office. The third and final case study investigated the use of mobile devices in an art gallery. The paper concludes with a discussion of the information access needs that are apparent in each of these learning contexts, and highlights the pertinent issues in the use of mobile technologies to support lifelong learners’ information needs. 相似文献
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Gheorghita Ghinea Sherry Y. Chen 《British journal of educational technology : journal of the Council for Educational Technology》2003,34(4):393-406
Multimedia technology has been widely used in web‐based instruction, but previous studies have indicated that individual differences, especially cognitive styles, have significant effects on users’ preferences with respect to presentation of multimedia content. However, such research has thus far neglected to examine the effect of cognitive styles on users’ subjective perceptions of multimedia quality. This study aims to examine the relationships among users’ cognitive styles, the multimedia Quality of Service (QoS) delivered by the underlying network, and Quality of Perception (QoP), which encompasses user levels of enjoyment and understanding of the informational content provided by multimedia material. Accordingly, 132 users took part in an experiment in which they were shown multimedia video clips presented with different values of two QoS parameters (frame rate and colour depth). Results show that, whilst the two QoS parameters do not impact user QoP, multimedia content and dynamism levels significantly influence the user understanding and enjoyment component of QoP. 相似文献
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当前,触屏手机已经成为人们日常生活不可或缺的产品。触屏手机交互设计的发展可分为三个阶段:基本功能需求的初级阶段;视觉和触控技术的日益成熟阶段;"以用户为中心",强调用户体验的人机交互时代。触屏手机的交互设计,就是让用户在更加快速﹑简单﹑高效地操作手机,实现功能的同时,还要获得视觉、听觉、触觉及心理上的愉悦感。 相似文献
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Lam Wai Leong Othman Ibrahim Mohammad Dalvi-Esfahani Hamed Shahbazi Mehrbakhsh Nilashi 《Education and Information Technologies》2018,23(6):2477-2498
With numerous benefits of utilising mobile social network sites (SNSs) for learning purposes, limited studies have been conducted to determine the factors that influence the adoption of mobile SNSs in facilitating learning. Accordingly, the main purpose of this study is to explore the determinants of students’ behavioural intention to use mobile SNSs for their pedagogical purposes by utilising an extended version of Technology Acceptance Model. Furthermore, the moderating effect of users’ experience on their behavioural intention was investigated. Using a structured questionnaire, data were collected from 600 students from top-five public universities of Malaysia. The results revealed perceived task-technology fit as the great predictor of users’ intention and perceived usefulness. Although the moderating impact of students’ experience on the model found to be positive, it was not supported in this study. The contributions of this study both to the literature and practice are discussed. 相似文献
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网站作为互联网的一个应用如何更好地为用户服务?如何以用户为中心,预测用户需求?如何建立用户偏爱的页面,对用户关心的内容进行重新组织?对于不同的用户,如何依据他们自身特点建立自适应网站?本文利用人的认知理论以及人机接口技术建立了一个网站模型,为个性化网站的设计提供了新的思路. 相似文献