一种基于Laplacian矩阵的图像匹配算法

文章提出了一种基于Laplacian矩阵的图像特征匹配算法。首先分别构造两幅图像特征点集的Laplacian矩阵,并对这两个矩阵进行奇异值分解(SVD),然后利用分解的结果构造出一个反应特征点之间匹配程度的关系矩阵,最后根据关系矩阵实现两幅图像的特征点匹配。大量实验结果表明,该文所提出的算法具有较高的匹配精度。     

无线社会网路由缓存管理和服务质量的研究

提出一种针对缓存容量受限的容迟移动网络的多复制路由和缓存管理的方法。该方法能充分利用有限的网络资源,实现更高的传送成功率,降低平均发送延迟,同时实现不同重要性报文的服务质量分级。     

应用人工智能技术开发和利用工业档案资源

目前工业档案管理面临信息、数据和知识过载、非结构化以及隐性信息、数据和知识提取三大难题。人工智能在信息、数据和知识处理方面具有很大的优势，有助于解决工业情报管理中的难题，实现工业信息情报的智能化管理，提高信息情报管理的水平，增强企业的竞争力。     

Building Technical Trading System with Genetic Programming: A New Method to Test the Efficiency of Chinese Stock Markets

Testing whether technical trading rules can beat buy-and-hold strategy is a common approach to study the efficiency of stock markets. Noticing that the common approach of evaluating popular technical trading rules’ profitability would result in the biases of data snooping and incomplete test, we build a technical trading system with genetic programming to test the efficiency of Chinese stock markets. This system takes historical prices and volumes as inputs, randomly generates treelike structured technical trading rules composed of basic functions, and optimizes the rules using genetic programming according to the inputs. Using daily prices and volumes of Shenzhen Stock Exchange 100 index from January 2, 2004 to March 12, 2010, we find out that the optimal technical trading rules generated by our technical trading system have statistically significant out-of-sample excess returns compared with buy-and-hold strategy considering realistic transaction costs. Therefore, we conclude that Chinese stock markets have not achieved weak-form efficiency.     

电子政务安全体系框架

网络信息安全对电子政务带来的威胁: 1.网上黑客与计算机犯罪 2.网络病毒的蔓延和破坏 3.机要信息流失与信息间谍潜入 4.网上恐怖活动与信息战 5.内部人员违规和违法 6.网上安全产品的失控     

基于二进小波变换的主动轮廓模型

针对传统的主动轮廓模型对噪声敏感的缺陷,在推广梯度矢量流的基础上,提出了基于二进小波变换的改进外力场的计算方法.通过综合利用图像小波分解的高频信息,迭代计算获得其外力场,使蛇在图像的多尺度空间中搜索目标轮廓.针对蛇模型对初始轮廓的依赖性问题,给出了在一维最大熵阈值分割后的图像上获取初始轮廓点的方法,减少了人工的干预,加快了蛇的收敛速度和效果.实验结果表明该模型能有效地排除噪声的干扰,搜索凹陷轮廓,而且对脆弱轮廓有很好的逼近能力.     

一种基于迭代阈值法的身份证图像二值化算法研究

针对身份证扫描图像受激光防伪阴影网格线影响较大的特点,对图像二值化的方法进行了深入分析和研究．提出了一种基于像素邻域特征的迭代阈值方法。该算法模型简单、易于实现．能滤除噪声、使字符笔划清晰地从背景中分割出来．获得了较好的二值化效果。     

基于专用PWM控制器的直流伺服位置系统

介绍了一种基于专用PWM(脉宽调制)控制器UC1637的直流位置伺服控制系统,对其中的系统原理、UC1637、功率转换电路、保护电路、位置检测、电磁兼容性设计等内容进行了详细的讨论.该系统可靠性高、成本低、广阔的应用前景.     

A hybrid scatter search meta-heuristic for delay-constrained multicast routing problems

This paper investigates the first hybrid scatter search and path relinking meta-heuristic for the Delay-Constrained Least-Cost (DCLC) multicast routing problem. The underpinning mathematic model of the DCLC multicast routing problem is the constrained Steiner tree problem in graphs, a well known NP-complete problem. After combining a path relinking method as the solution combination method in scatter search, we further explore two improvement strategies: tabu search and variable neighborhood search, to intensify the search in the hybrid scatter search algorithm. A large number of simulations on some benchmark instances from the OR-library and a group of random graphs of different characteristics demonstrate that the improvement strategy greatly affects the performance of the proposed scatter search algorithm. The hybrid scatter search algorithm intensified by a variable neighborhood descent search is highly efficient in solving the DCLC multicast routing problem in comparison with other algorithms and heuristics in the literature.     

Bookmark——智能化网络信息服务系统

介绍了一种基于“零关键字信息查询”的智能化网络信息服务系统－－Ｂｏｏｋｍａｒｋ。系统采用ＨＴＴＰ协议实现信息的自动搜集,信息分类器对搜索来的信息进行自动分类,装入信息数据库。系统通过监测用户的信息记录获得信息需求,信息过滤器根据用户提出的信息推荐请求对数据库中的信息进行过滤并将合适的信息提交给用户,信息评价器根据用户对推荐信息作出的评价对系统进行优化。运行结果表明,Ｂｏｏｋｍａｒｋ系统具有良好的信