基于单片机和GM8125的多路串口收发器设计

介绍了串口扩展芯片GM8125的特性,设计了基于该芯片和8051单片机的多路串口收发器,程序算法及硬件电路实现了多达4台子设备(电子天平)到主设备(打印机)数据标号传输,并有效地解决了GM8125芯片多路并行工作时的出现的乱码和数据混乱的问题。系统使用方便,实时性好,扩展方便,取得了良好的实际应用效果。     

基于Asp脚本的一种登录口令加密算法

大量的网站后台程序都使用ASP脚本语言开发,但由于ASP本身存在一些安全漏洞和程序的不严密,给黑客提供了攻击网站的机会。该文提供了一种基于asp编程语言的口令加密方法,具有不可逆算、暗文口令、增强防御等特点,在实际应用中取得了很好的效果。     

基于AD RMS的信息权限保护应用开发研究

对电子信息实施保护,使电子信息按允许的方式使用是企业和机构业务正常进行的重要需要.AD RMS支持对信息的受控发布与使用,本文介绍AD RMS信息授权保护的原理,阐述了支持AD RMS信息保护的应用程序的开发和调试方法.     

Hilbert‐shaped complementary ring resonator and application to enhanced‐performance low pass filter with high selectivity

In this article, a novel single negative metamaterial (MTM) transmission line (TL) consisting of a Hilbert‐shaped complementary ring resonator (H‐CRR) on the ground plane is initially presented and studied in depth. Then based on the proposed MTM TL, a novel six‐section Hi‐Lo microstrip low‐pass filter (LPF) with a cut‐off frequency 2.5 GHz is developed, fabricated, and measured. Measurement results indicate that: by integrating H‐CRR, the selectivity has been significantly improved which is 77.3 dB/GHz due to the single negative permittivity; by etching a crown square on low‐impedance section, the bandwidth characterized by 20 dB return loss was obviously enhanced by 26.2% and the maximal sidelobe level of in‐band return loss was reduced from 22 to 24.6 dB. What' more, the developed LPF achieved a 36.3% size reduction with respect to its conventional counterpart. The design concept, which was confirmed by the measurement data, is of practical value and can be popularized in other microwave devices where high selectivity is requested. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.     

Research on the group decision-making about emergency event based on network technology

In order to improve decision-making efficiency about emergency event, this paper proposes a novel concept, i.e., Agile-Delphi Method, which is an integration of agile decision and Delphi Method implicating that the decision-makers instantly deliver, respond, treat, and utilize information via Delphi process while conducting group decision-making about emergency event. The paper details the mechanism of group decision-making about emergency event based on network technology and Agile-Delphi Method. Finally, the paper conducts an empiric analysis taking the “111 event”, i.e., the liquid ammonia spill event happened on November 1, 2006 in a phosphorus chemical company in China, as an example.     

Combination framework of rendezvous algorithm for multi‐agent systems with limited sensing ranges

In this paper, we present a novel rendezvous algorithm framework ‐ the combination framework, which is named after the term convex combination in computational geometry. The convergence of the proposed algorithms is proved based on the novel tools from the recent results in graph theory and consensus study. It has been observed that the circumcenter algorithm can be considered as a special case of the combination framework. Moreover, the relevant analysis provides us a novel viewpoint on designing and the rendezvous rate of rendezvous algorithms for networked multi‐agent systems with limited sensing ranges. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society     

An improved CE/SE scheme for numerical simulation of gaseous and two-phase detonations

A new structure of solution elements and conservation elements based on rectangular mesh was proposed and an improved space-time conservation element and solution element (CE/SE) scheme with second-order accuracy was constructed. Furthermore, the application of improved CE/SE scheme was extended to detonation simulation. Three models were used for chemical reaction in gaseous detonation. And a two-fluid model was used for two-phase (gas-droplet) detonation. Shock reflections were simulated by the improved CE/SE scheme and the numerical results were compared with those obtained by other different numerical schemes. Gaseous and gas-droplet planar detonations were simulated and the numerical results were carefully compared with the experimental data and theoretical results based on C-J theory. Mach reflection of a cellular detonation was also simulated, and the numerical cellular patterns were compared with experimental ones. Comparisons show that the improved CE/SE scheme is clear in physical concept, easy to be implemented and high accurate for above-mentioned problems.     

InfoSigs:一种面向Web对象的细粒度聚类算法

面向Web对象的细粒度聚类已经成为学术界研究的热点.然而现有大多数聚类模型只关注如何对文本内容或文章主题进行聚类,聚类结果粒度较粗,无法满足大规模网络信息检索的质量要求.针对上述挑战,充分挖掘Web文档中词汇间的树状概率层次关系,提出一种以词汇信息分布作为特征标志的聚类算法InfoSigs,实现对Web对象的细粒度聚类.算法构建一个信息传递有向无环图,根据词汇在图中信息分布的集中度赋予其合理的权重,产生更具代表性的特征向量;同时算法提出了一个自适应的记录合并模型,有效提高记录簇中记录间的相似度,减少噪音对合并过程的影响.实验结果表明,InfoSigs算法比传统聚类算法—I-Match和Shingling—在F-Measure值上平均约有21.3%的提高,可以有效地运用到多领域Web对象的聚类问题.     

基于CISOM的协作信息系统模型

结合移动代理技术以及分布式信息系统的特点,提出一种基于移动代理的协作信息中间件(CISOM)模型。阐述CISOM的设计思想、系统结构,依靠移动代理的迁移和通信,实现协作实体间的信息交互。对系统在代理、网络传输、资源存取方面的安全性进行了分析。     

基于正交主平面投影的三维模型检索算法

主平面分析是一种新颖的快速有效的三维模型检索算法,但单个主平面对三维模型的信息描述能力不够强,影响了检索的准确度.本文通过分析主平面分析的基本原理,在单个主平面的基础上提出三个正交主平面的方法,将三维模型分别在三个正交主平面上投影,然后对投影图像提取旋转不变的矩,形成三雏模型的特征向量进行特征匹配,从而更充分的描述了三维模型的特征.试验表明提高了检索性能.