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1.
在Internet网络上,使用TCP／IP协议时每台主机必须具有独立的IP地址,有了IP地址的主机才能与网络上的其它主机进行通讯。随着网络应用大力推广,网络客户急剧膨胀,由于静态IP地址分配,IP地址冲突问题也时有出现。 相似文献
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DHCP（Dynamic Host Configuration Protocol）是动态主机配置协议的缩写,在常用的小型网络中,IP地址的分配可采用静态方式,但对于客户端较多的大、中型网络中,如果为每一台计算机都分配一个静态IP地址,这样会大大加重网络管理人员的负担,并容易导致IP地址分配错误,因此,在大中型网络中使用DHCP是非常有必要且高效的。 相似文献
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主要分析了IP地址冲突的危害和IP地址冲突的工作原理以及造成IP地址冲突的原因。提出了一些相对有效的解决方案,最终避免局域网中发生IP地址冲突。 相似文献
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局域网用户数目的增加使得IP地址消耗非常快，IP地址盗用引起的网络冲突问题也越来越多。本文对IP地址的工作原理、盗用方法、盗用后果、防范技术等进行了较系统的分析和研究，从而提出了如何有效地防止和杜绝因局域网IP地址冲突而引起的一系列问题的措施。对管理局域网IP地址具有一定的借鉴作用。 相似文献
5.
无线移动通信网络中,易存在IP地址管理与分配冲突问题。目前IP地址自动分配方法存在网络通信开销大且节点入网成功率较低的问题。为此提出了一种新的无线移动通信网络IP地址自动分配方法。首先捕获无线移动通信网络中大规模设备的数据包,确定设备主机IP地址范围,计算无线移动通信网络掩码并进行修正处理,通过计算得到子网IP范围的起始地址。然后采用平均邻居逻辑距离来衡量无线移动通信网络相似度,统计通信网络中所有节点与设备邻居逻辑距离和的平均值,最后计算通信网络中所有节点的平均邻居逻辑距离理论值,完成IP地址分配。通过实验分析验证,所提方案能够降低网络通信开销和时间消耗,而且大幅度提高无线移动通信网络节点的入网成功率。 相似文献
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VLAN中IP地址冲突的解决方案及管理策略 总被引：1，自引：0，他引：1
从VLAN中IP地址获得的途径入手,分析了发生IP地址冲突的原因,结合自己在实践中的教训和经验介绍了IP地址冲突的解决方案,并给网络管理员提供了一种可行的管理策略。 相似文献
8.
在局域网中,通过ARP协议来完成IP地址转换为第二层物理地址（即MAC地址）。ARP协议对网络安全具有重要的意义。通过伪造IP地址和MAC地址实现ARP欺骗,能够在网络中产生大量的ARP通信量使网络阻塞。 相似文献
9.
基于ARP攻击原理及其解决方法的研究 总被引：1，自引：0，他引：1
在局域网中,通过ARP协议来完成IP地址转换为第二层物理地址（即MAC地址）的。ARP协议对网络安全具有重要的意义。通过伪造IP地址和MAC地址实现ARP欺骗,能够在网络中产生大量的ARP通信量使网络阻塞。 相似文献
10.
本文主要简述了网络IP地址的相关知识:IPv4与IPv6的概念,国内外IP地址分配地现状,国外IP地址的发展趋势和我国的IP地址的发展与规划。本文简述的IP地址知识对网络IP地址的初步认识和理解起到一定的指导作用。 相似文献
11.
A research 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 in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
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. 相似文献
12.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
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. 相似文献
13.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US 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 the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
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. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
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. 相似文献
15.
Active biological molecules 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 therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
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. 相似文献
16.
《中国科学院院刊(英文版)》2008,22(1):2-3
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. 相似文献
17.
《中国科学院院刊(英文版)》2008,22(1)
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." 相似文献
18.
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. 相似文献
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
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. 相似文献
20.
Puay Tang 《The Information Society》1998,14(1):19-31
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. 相似文献