基于码分多址和防碰撞功能 的RFID安全认证协议

利用码分多址技术的保密性、抗干扰性和多址通信能力,结合认证密钥和Hash函数,设计了一种适用于RFID系统且具有防碰撞功能的安全认证协议. 理论和分析表明:与常用的安全认证协议相比,新协议在保证一定复杂度基础上,不仅能有效地解决标签的碰撞问题,而且可抵抗包括重传、跟踪、阻断和篡改在内的多种攻击手段,尤其针对来自系统内安全威胁,具有一定的安全性和实用性.     

基于YAZ工具包的Z39.50客户端的开发

本文介绍了Z39．50开发工具包YAZ的结构与特点以及基于该工具包实现Z39．50客户端的流程与关键函数,并给出实现业务的关键代码。希望本文的内容对于推广Z39．50信息检索标准的运用与服务有所帮助。     

基于SIP视频会议技术在图书馆实时参考咨询中的应用

分析了图书馆实时参考咨询服务的现状．讨论了图书馆发展基于视频会议的实时参考咨询系统的需求和可行性。结合图书馆的实际业务特点。研究了基于SIP的视频实时参考咨询系统的模型结构和实现方案,提出了视频会议实时参考咨询的创建方向。     

Information perception and feedback mechanism and key techniques of multi-modality human-robot interaction for service robots

With theincreasing of the elderly population and thegrowing health care cost ,the role of service robots inaiding the disabled and the elderly is becoming i mpor-tant. Many researchers in the world have paid muchattention to healthcare robots and rehabili…     

浅析Z39.50协议在我国数字图书馆建设中的应用

本文介绍了Z39．50协议及其在国内数字图书馆建设中的应用情况，分析了该协议在具体应用中存在的问题,并展望了Z39．50的发展前景。     

用NS2开发计算机网络性能测试实验

分析了"计算机网络"课程实验教学中存在的问题,提出用仿真软件NS2开发网络性能测试实验的思路,对理论与实际的有机结合进行了探讨。给出了实验开发的一个实例:802.11WLAN DCF协议性能测试实验,详细介绍了构建仿真模型、测试吞吐率和实验数据分析等方面的实验开发过程。有助于学生理解课程中抽象的概念和理论,对于培养学生的研究能力具有重要作用。     

The role of lexical knowledge and related linguistic components in typical and poor language comprehenders of Chinese

The present study adapted the “Blueprint of the Reader” in comprehending language by Perfetti [2000, C. M. Brown & P. Hagoort. (Eds.), The neurocognition of language (pp. 167–208). Oxford, UK: Oxford University Press] as a framework for understanding Chinese language and reading comprehension in a group of 361 secondary Forms 1, 3 and 4 Cantonese-speaking Chinese students (mean age of 15 years) in Hong Kong. This framework with some modifications was tested with nine specially designed Chinese language and reading tasks with reasonably high reliability and surface validity. The main hypothesis was that lexical knowledge consisting of derivational morphology; correction of characters, words and sentences; segmentation of text into phrases and sentences; and writing to dictation should explain considerable individual variations, as shown in the English literature. This was tested with component analyses and multiple regression analyses. The total battery accounted for 66.80% of the variation while lexical knowledge alone explained 33.51% of the individual variation in the overall school performance in Chinese reading and writing. The second hypothesis was that subgroups of poor and good language and reading comprehenders in Chinese would be expected to show overlapping yet different component structures and their performance in the individual component tasks would be expected to differ as tested with analyses of variance. The results confirmed this hypothesis. Task analyses of the written protocols of essay writing and of morphological processing (prefixing and suffixing) provided insight into well-formed and poorly formed writing and word formation according to principles of Chinese psycholinguistics and yielded information for theory-based practice.     

基于固定电话网短消息的传送

分析了利用固定电话网实现短消息传送这一崭新的业务，包括短消息传送处理流程，短消息传送协议概述等，简要介绍了所做的工作。     

VPDN技术的发展与应用研究

VPN具有建网快速方便，降低建网投资，节约使用成本，简化用户对网络的维护及管理工作等优势，在安全性能方面VPN主要采用国际标准的网络安全技术，通过在公用网络上建立逻辑隧道及网络展的加密，避免网络数据被修改和盗用，保证了用户数据的安全性及完整性。但VPDN在推广上存在一些问题。本就VPDN的发展趋势、实现方案及需要解决的问题作一些探讨。     

安全网络数学计算协议

讨论了网络数学计算框架 IAMC的安全性问题,给出了一个用安全协议 SSL/TIS提高数学计算协议MCP安全性的实现方案.改进后的网络数学计算框架可有效地提供计算数据的机密性、完整性和用户认证等安全功能.