Regulation,investment and efficiency in the transition to next generation broadband networks: Evidence from the European Union

This article explores the impact of public policy on technological change and the development of broadband infrastructure in EU member countries. The analysis explores contradictory findings in previous empirical literature on the interplay between regulation, competition, and investment, noting the importance of the construction of indicators employed to evaluate these interactions. Furthermore, the article points out that the traditional policy model and related empirical literature treat fixed capital inputs in networks as a measure of broadband infrastructure quality. However, relatively higher capital inputs do not necessarily translate into the development of relatively higher quality broadband networks. Using broadband network performance measurements between 2007 and 2012, the article addresses this contradiction in the literature and evaluates the determinants of broadband infrastructure quality in the EU. The analysis suggests countries that have been more effective at promoting entry and competition in the provision of Internet access services have developed relatively higher quality broadband networks.     

The use of Facebook for political commentary in South Africa

The use of the Internet, and especially social media networks, is becoming increasingly relevant for 21st century politics, not only for political campaigning purposes, but also as a platform to encourage the public to engage in political discourse. This study considers comments posted on two South African political party Facebook sites: the African National Congress’ (ANC); and the Democratic Alliance’s (DA). It examines how both the South African public and the political parties are using the site for discussion, debate and opinion formation. The study also investigates the perceived benefits and challenges that are offered to members of the Facebook groups. According to the findings, the public are using the Facebook site(s) to engage in discussion of a political nature as well as using the platform to connect with each other and share political information in new ways. However, it is this article’s contention that the two political parties are not fully capitalising on the potential offered by Facebook.     

航天任务指挥显示系统多厅协同控制模型研究

航天任务可靠性要求高,指挥显示系统是其关键子系统。研究了航天任务及指挥显示系统的特点,分析了指挥显示系统结构模型,建立了多厅协同控制的"流程—脚本—指令"模型。神舟十号与天宫一号交会对接任务的应用实践表明,该模型实现了航天任务协同工作计划的公用显示指挥控制,为操控人员提供了快捷方便的控制手段,有效地完成了任务期间的公用显示保障,提高了任务的指挥水平。     

基于SOA的软件公共服务平台设计与实现

本文基于面向服务的体系架构(SOA)进行了需求分析与设计,实现了面向中小企业资源共享与整合的软件公共服务平台。本文着重介绍了该平台的总体框架和关键技术实现,包括使用Web Service实现跨库检索、结合企业服务总线(ESB)实现路由配置和消息转换,以及基于角色的访问控制(RBAC)实现用户权限管理等。经测试,验证了平台的可用性。实践表明,该平台满足中小企业信息化服务需求,便于分布式资源的共享与交互。     

Public Spheres in Interaction: Comment Sections of News Websites as Counterpublic Spaces

Research scrutinizing political talk online has been developed largely against the backdrop of deliberative discursive norms and considered political talk without a systematic analysis of surrounding mass‐mediated discourses. By contrast, this study operationalizes counterpublic theory as an alternative theoretical perspective and analyzes comments on news websites as a reaction to hegemonic mainstream public spheres. It juxtaposes a qualitative framing analysis of all articles about a new anti‐Euro party in devotedly pro‐European Germany published on 9 news websites in the week following the 2013 elections (n = 22) with a content analysis of all comments posted below these articles (n = 3,154). It finds counterpublic spheres differently shaped in comment sections of right‐ and left‐leaning, and tabloid and nontabloid, outlets. Consequences for democracy are discussed.     

An efficient voting based decentralized revocation protocol for vehicular ad hoc networks

Vehicular Ad-hoc NETworks (VANETs) enable cooperative behaviors in vehicular environments and are seen as an integral component of Intelligent Transportation Systems (ITSs). The security of VANETs is crucial for their successful deployment and widespread adoption. A critical aspect of preserving the security and privacy of VANETs is the efficient revocation of the ability of misbehaving or malicious vehicles to participate in the network. This is usually achieved by revoking the validity of the digital certificates of the offending nodes and by maintaining and distributing an accurate Certificate Revocation List (CRL). The immediate revocation of misbehaving vehicles is of prime importance for the safety of other vehicles and users. In this paper, we present a decentralized revocation approach based on Shamir’s secret sharing to revoke misbehaving vehicles with very low delays. Besides enhancing VANETs’ security, our proposed protocol limits the size of the revocation list to the number of the revoked vehicles. Consequently, the authentication process is more efficient, and the communication overhead is reduced. We experimentally evaluate our protocol to demonstrate that it provides a reliable solution to the scalability, efficiency and security of VANETs.     

A new group-oriented publicly veriablethreshold signcryption scheme

Through cryptanalysis of the improved scheme of a generalized group-oriented threshold signcryption schemes, it is found that the improved scheme can effectively resist conspiracy attack and forgery attack, but does not have semantic security and public verification function, and sends threshold signcryption by the secret secure channel, which increases the communication costs and potential safety hazards of the system. A new group-oriented publicly verifiable threshold signcryption scheme is proposed on the basis of the improved scheme, the new scheme overcomes the drawbacks of the improved scheme, which not only provides with semantic security and public verification function, but also can send threshold signcryption by the public channel.     

变事后监管为事前监管

为改变互联互通中存在的不利局面，湖南省通信管理局在制度和监管手段创新等方面进行了有益的探索，尝试变事后监管为事前监管，采用措施有：建立协商机制；完善网间通信质量预警预后机制；建立网间通信质量保障机制；明确互联条件和时限，强化自动增配电路机制；强化行业自律等，其创新手段包括；引入企业的网络监控系统；采取不定期测试和拨测方法来监控网间通信质量状况；明确定义网间通信质量指标制定了网间结算管理办法等。     

公共物品与普遍服务实现机制

电信普遍服务是一种介于非纯公共物品和纯公共物品之间的特别物品，完全通过市场机制或纯粹由政府来提供目前都存在障碍。普遍服务实现机制的内容包括：普遍服务界定、普遍服务成本测算、普遍服务成本承担和补偿以及普遍服务实施等。从目前看，普遍服务基金是竞争环境下实现普遍服务的较好方式。     

CMOS单片LDO线性稳压器的设计

设计出一种低压差线性稳压器，并对其结构的工作原理进行了分析，重点讨论了各个关键电路模块的设计，Hspice模拟结果验证了设计的正确性。