探析办公自动化的网络安全

随着社会科学以及社会经济的高速发展,计算机已经普及到了日常的工作、生活,而利用计算机的办公自动化,更是办公的阶段性提高.但是,办公的自动化也伴随着一些网络的安全问题,而提高网络的安全监管,防止信息的失真、修改、盗取,就显得非常重要了.本文就这个问题进行简单的探讨.     

CFB-FGD半干法烟气脱硫网络控制系统的设计与实现

循环流化床半干法烟气脱硫（CFB-FGD）技术是目前烟气脱硫综合效益最优越的一种半干法烟气脱硫技术。文章主要设计并实现了CFB-FGD半干法烟气脱硫网络控制系统。该系统结合了快速以太网、工业以太网以及现场总线,构成三层控制网络;采用了合理的冗余结构,提高了系统的可靠性。实际的运行表明,该系统实现设计合理稳定,实现了半干法烟气脱硫的自动化控制,提高了脱硫效率。     

关于无线传感器网络MAC层协议的研究

当前,无线传感器网络(WSN)是国内外备受关注的一个新兴前沿热点领域,已经吸引了许多研究者和机构的广泛关注.本文简单介绍了无线传感器网络以及MAC协议,对MAC协议进行了分类、分析,比较和总结了这些协议的核心机制、性能和特点,最后得出结论,展望了今后无线传感器网络MAC协议的研究重点及策略.     

CAD/CAE公共服务平台中资源共享智能型系统研究

在产业技术公共服务平台的影响和带动下,随着其用户规模不断扩大和信息技术的发展,越来越要求平台服务向智能化发展,有必要对其中之一的资源共享智能型系统建设进行探讨。     

Enhancing the accuracy of WLAN-based location determination systems using predicted orientation information

Indoor location determination has emerged as a significant research topic due to the wide-spread deployment of wireless local area networks (WLANs) and the demand for context-aware services inside buildings. However, prediction accuracy remains a primary issue surrounding the practicality of WLAN-based location determination systems. This study proposes a novel scheme that utilizes mobile user orientation information to improve prediction accuracy. Theoretically, if the precise orientation of a user can be identified, then the location determination system can predict that user’s location with a high degree of accuracy by using the training data of this specific-orientation. In reality, a mobile user’s orientation can be estimated only by comparing variations in received signal strength; and nevertheless the predicted orientation may be incorrect. Incorrect orientation information causes the accuracy of the entire system to decrease. Therefore, this study presents an accumulated orientation strength algorithm which can utilize uncertain estimated orientation information to improve prediction accuracy. Implementation of this system is based on the Bayesian model, and the experimental results indeed show the effectiveness of our proposed approach.     

On tests of rate ratio under standard inverse sampling

Inverse sampling suggests one continues to sample subjects until a pre-specified number of rare events of interest is observed. It is generally considered to be more appropriate than the usual binomial sampling when the subjects come sequentially, when the response probability is rare, and when maximum likelihood estimators of some epidemiological measures are undefined under binomial sampling. Reliable but conservative exact conditional procedure for the ratio of the response probabilities of subject without the attribute of interest has been studied. However, such a procedure is inapplicable to the risk ratio (i.e., ratio of the response probabilities of subject with the attribute of interest). In this paper, we investigate various test statistics (namely Wald-type, score and likelihood ratio test statistics) for testing non-unity risk ratio under standard inverse sampling scheme, which suggests one continue to sample until the predetermined number of index subjects with the attributes of interest is observed. Both asymptotic and numerical approximate unconditional methods are considered for P-value calculation. Performance of these test procedures are evaluated under different settings by means of Monte Carlo simulation. In general, the Wald-type test statistic is preferable for its satisfactory and stable performance with approximate unconditional procedures. The methodologies are illustrated with a real example from a heart disease study.     

基于数字图像处理的控制系统动态性能测量

针对目前位置控制伺服系统动态性能较难准确测量的问题,提出了一种基于激光和数字图像处理的测量思路,实现了对运动轨迹的数字化监测,并以某火炮检修中的位置控制伺服系统为例,详细介绍了系统组成、软件处理系统及相应的试验结果.这是开展位置控制伺服系统动态性能准确测量的有益尝试.     

一种基于PIM-SM的扩展组播路由EPIM-SM的设计

提出了一种基于PIM-SM的新的扩展协议EPIM-SM(extend to PIM-SM).该协议采用了一种新的算法代替PIM-SM用于RP选举的哈希算法,新协议提供这样一种机制:根据网络拓扑结构及组播源和成员的变化情况,为每个候选RPi估算其组播树整体代价,定期选择一个代价值最小的RP,以使组播树的代价始终保持接近最低.     

基于WAP的校园无线门户网站设计与实现

WAP(Wireless Application Protocol)是Internet与移动网络有机结合的技术,为无线数据应用提供了平台.通过详细介绍WAP技术的原理与编程开发模型,根据校园门户网站的新需求,将JSP(Java Server Pages)技术与WAP技术相结合,设计和开发了校园无线门户网站,提出了在开发过程中出现的关键技术问题,并给出相应的解决方案.     

基于Agent的分布仿真平台原型系统设计与实现

基于Agent的分布仿真是基于Agent的建模与仿真ABMS(Agent-Based Modeling and Simulation)研究的重要组成部分。在提出的基于Agent的分布仿真软件框架和通信系统设计与实现的基础上,利用Java语言和面向对象的方法设计实现了一个基于Agent的分布仿真平台原型系统ADSimE。介绍了该分布式仿真平台的主要实现细节,给出了全系统的主要Agent类的UML设计,重点阐述了保守策略仿真Agent类和乐观策略仿真Agent类的设计、处理流程以及KQML消息解析的实现细节。最后以闭合排队网络为例,说明了怎样在该环境下进行基于Agent的分布仿真应用的开发。