Sustainability in Web server systems

The exponential growth of Internet during the last decade leads us to make more efforts in the researching and developing of sustainable Web servers in order to decrease the global energy demand. In this paper, we cover, as a first step, a proper review of the literature related to the energy efficiency research in Web server systems to depict the state of the art to plan further contributions as more research in sustainable Web systems. We also propose and implement an energy metric that permits to establish a relation between the Quality of Service (QoS) obtained by the system and the power it consumes.     

Determinants of users’ continuance of social networking sites: A self-regulation perspective

Social networking sites (SNS) have transformed how individuals interact, build and maintain social relationships. We proposed a research model on the determinants of user continuance using Bagozzi's framework of self-regulation as the theoretical foundation. Following the process of appraisal → emotional reactions → coping responses, we developed the model by leveraging findings from social presence and IS continuance research. Based on survey data from Facebook users, we found that appraisal factors (pleasure, awareness, connectedness, and system quality) were strong determinants of emotional reaction (user satisfaction and sense of belonging). User satisfaction and sense of belonging together positively influenced continuance intention.     

Aligning principal and agent’s incentives: A principal–agent perspective of social networking sites

The viability of networked communities depends on the creation and disclosure of user-generated content and the frequency of user visitation (Facebook 10-K Annual Report, 2012). However, little is known about how to align the interests of user and social networking sites. In this study, we draw upon the principal-agent perspective to extend Pavlou et al.’s uncertainty mitigation model of online exchange relationships (2007) and propose an empirically tested model for aligning the incentives of the principal (user) and the agent (service provider). As suggested by Pavlou et al., we incorporated a multi-dimensional measure of trust: trust of provider and trust of members. The proposed model is empirically tested with survey data from 305 adults aged 20-55. The results support our model, delineating how real individuals with bounded rationality actually make decision about information disclosure under uncertainty in the social networking site context. There is show little to no relationship between online privacy concerns and information disclosure on online social network sites. Perceived benefits provide the linkage between the incentives of principal (user) and agent (provider) while usage intensity demonstrated the most significant impact on information disclosure. We argue that the phenomenon may be explained through Communication Privacy Management Theory. The present study enhances our understanding of agency theory and human judgment theory in the context of social media. Practical implications for understanding and facilitating online social exchange relationships are also discussed.     

认知无线电网络信道交汇研究综述

认知无线电技术被认为是解决目前频谱资源利用率低下问题最有前景的技术,基于该技术,认知无线电网络采用动态频谱接入方式有效地提高了授权频段的利用率.然而,动态变化的信道可用性极大地增加了认知无线电网络组网的难度.信道交汇旨在为用户通信提供公共传输媒介,是实现无线网络组网的基础.介绍了认知无线电网络信道交汇的基本概念和特点,并阐述了信道交汇策略设计面临的挑战以及应考虑的性能指标.提出了信道交汇策略的分类标准和系统模型,根据该分类标准,详细剖析了当前信道交汇策略相关的研究工作.最后,讨论了认知无线电网络信道交汇研究的开放性问题,以期为未来的研究指出可能的方向和重点.     

基于云计算的社交网络流量识别与管理研究

目前社交网络发展迅速,但国内外对于社交网络流量的识别并未给出有效的方法,文章以三种主流的社交网络为研究对象,深入分析了各社交网络流量的净荷特征和流量特征,给出了各个社交网络数据流量的识别方法。在此基础上,利用基于净荷特征与流量特征相结合的方法对采自校园网的流量进行了识别和分析,实验结果表明,基于净荷特征与流量特征相结合的方法的识别准确率较单独使用每一种方法的识别准确率有明显提高。     

上海贝尔软交换核心网组网方案细节探讨

文章对中国电信CDMA一期工程中上海贝尔公司软交换核心网组网方案的细节进行分析,提出网络结构优化方案,以提高网络安全性,降低网络运营成本OPEX。     

Ad hoc网络时钟同步研究*

为解决时钟同步方案存在依赖特殊节点以及算法精度不高等问题,在组网过程与自组网互同步相结合的基础上,完成网络节点的时钟同步,并通过测量网络延迟以提高同步精度.方案在一跳场景下验证,可将误差维持在15μs左右,提高了同步精度,并且本方案不需要特殊节点,各个节点只需要收到一个同步帧就可以自发地调整时钟,同步帧的开销小、实现简单,适用于多跳和灵活易变的Ad hoc网络.     

社交网络形成和演化的特征模型研究

社交网络和微博的网络特征除具有传统无标度网络的典型特征外,还存在其他不容忽视的特征,现有模型均不能对此进行准确描述。在比较分析网络数据的基础上,提出一种混合模型对类社交网络的形成和演化特征进行描述,并建立了基于该模型的平均场方程,方程的解显示出该模型的度分布服从偏移和拉伸后的幂律。仿真结果表明,作者提出的模型模型能描述出社交网络的综合特征。对包括本文模型在内的几种模型进行了比较,并对各种模型间出现特征差别的原因进行了分析。     

议网络化医院的管理

当前,医院信息化建设快速发展,医院网络化已经成为一种普遍的医院运营模式,对医院经济管理产生着越来越重要的影响.网络提高了财务管理的效能,加大了会计监督的力度,提高了医院整体运营决策服务水平和信息管理水平.     

泛在电力物联网通信需求及技术适用性分析

针对泛在电力物联网的业务需求,分析了带宽、传输时延及可靠性等方面对现有通信技术的适用性;从本地业务和远端业务两方面,探讨了泛在电力物联网网络层通信组网模式、骨干层和接入层代表性通信技术的特点及未来泛在电力物联网的接入组网方式;并给出加强感知层的覆盖建设,推广智能终端、高速载波技术的应用,以及促进电力网与信息网的深度融合等建议。