IPv6路由协议分析

介绍了IPv6常见的几种路由协议,对其进行了比较分析,并指出当前情况下如何选择合适的路由协议。     

关于下一代互联网IPv6路由协议的研究

在Internet日益发展壮大的过程中,IPv4网络协议起到了不可低估的作用,但是,随着更多的网络终端连入Internet的时候,IP网络地址明显出现了“匮乏危机”,同时日益增大的路由表空间也给路由设备造成了巨大的压力。主要论述了IPv6选路和网络协议中的路由算法以及路由协议等问题。     

常用动态路由协议安全性分析及应用

随着动态路由协议的广泛应用,路由协议的安全性越来越被人们所关注,在实际应用中针对路由协议的攻击时常发生。通过对路由协议安全性原理分析及实际应用的解析,对各种动态路由协议的安全性进行了详细的阐述和总结。     

关于下一代互联网IPv6路由协议的研究

在Internet日益发展壮大的过程中，IPv4网络协议起到了不可低估的作用，但是，随着更多的网络终端连入Internet的时候，IP网络地址明显出现了“匮乏危机”，同时日益增大的路由表空间也给路由设备造成了巨大的压力。主要论述了IPv6选路和网络协议中的路由算法以及路由协议等问题。     

OSPFv3和OSPFv2的差异分析

IPv6是为适应Internet的发展而在IPv4的基础上产生的新一代IP协议。当前支持IPv6的较为成熟的路由协议有RIPng和OSPFv3,其中,OSPFv3是当前应用最广泛的域内路由协议。文章通过对OSPFv3和OSPFv2的对比,分析了OSPFv2与OSPFv3之间的主要差异。     

6to4路由域非对称路径解决方案研究

6to4隧道是IPv4过渡到IPv6时产生的一种过渡技术，该技术能够解决IPv4网络中的IPv6站点之间的通信和IPv6站点和IPv6骨干网之间的通信。本文通过对6to4路由域中存在的非对称路径问题的研究，讨论了6to4 Relay Anycast机制，并提出了基于路由策略的解决方案。在路由策略解决方案中，设计了新的拓扑结构，在该拓扑结构上实施了静态路由、BGP4＋等方法，从而消除了非对称路径。     

浅谈高校图书馆网络IPv4协议向IPv6协议的过渡

介绍了IPv6协议与IPv4协议相比在IP址范围、路由效率等方面的优势,提出了高校图书馆IPv6网络几种可行的组建方案。     

基于最优多属性约束的IPV6动态路由协议优化

提出一种基于最优多属性约束的IPV6动态路由协议优化方法。根据IPV6动态路由协议中数据属性的约束条件,建立最优多属性约束模型,用来描述不同属性约束条件需要符合的要求。详细描述了IPV6动态路由协议的设计方式,从而实现大范围网络通信。实验结果表明,利用这种方法进行网络通信,能够避免传统算法的缺陷,提高了通信效率,取得了令人满意的结果。     

增强型内部网关路由协议及其配置方法

EIGRP是思科公司开发的一种动态路由协议,是思科公司的专用协议。它是对IGRP动态路由协议的增强,解决了IGRP的不足和缺陷。     

在实验室环境下配置IPv6

本文首先简要介绍了IPv6及其地址的特点，然后以Windows Server2003为例，介绍如何安装IPv6协议、配置IPv6地址、配置IPv6的DNS服务、配置IPv6的路由等方法，从而使用户能尽快掌握IPv6的基本概念和使用特点。     

Low doses of a red wine ingredient figh diabetes in mice

Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.     

To serve and promote science development via innovation

CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.     

Tracing the origin and early radiation of birds——Paleornithologist ZHOU Zhonghe

With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Molecular motor assembly of a biomimetic system

Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

The Information Environment and Universal Service

This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.