基于网站结构挖掘的Web文档自动分类

对Web文档进行人工分类可以达到准确的分类效果，但需要大量的时间和人力的投入。传统的基于特征向量的分类方法准确性较低，文中提出把挖掘网站的拓扑结构和现有的文档分类方法相结合，并根据扩展网页的特征提取，挖掘出单个网站的分类模式，再将多个网站的分类模式进行综合，生成搜索引擎的分类模式。     

Analysis of a Classifier with Random Thresholds

A neural classifier with random thresholds is considered. Probabilistic analysis of functional characteristics depending on the classifier parameters is performed, and recommendations for their selection are made. The classifier structure optimization is proposed for input data distribution.     

Statistical Pattern Modeling in Vision-Based Quality Control Systems

Machine vision technology improves productivity and quality management and provides a competitive advantage to industries that employ this technology. In this article, visual inspection and quality control theory are combined to develop a robust inspection system with manufacturing applications. The inspection process might be defined as the one used to determine if a given product fulfills a priori specifications, which are the quality standard. In the case of visual inspection, these specifications include the absence of defects, such as lack (or excess) of material, homogeneous visual aspect, required color, predetermined texture, etc. The characterization of the visual aspect of metallic surfaces is studied using quality control chars, which are a graphical technique used to compare on-line capabilities of a product with respect to these specifications. Original algorithms are proposed for implementation in automated visual inspection applications with on-line execution requirements. The proposed artificial vision method is a hybrid between the two usual methods of pattern comparison and theoretical decision. It incorporates quality control theory to statistically model the pattern for defect-free products. Specifically, individual control charts with 6-sigma limits are set so the inspection error is minimized. Experimental studies with metallic surfaces help demonstrate the efficacy and robustness of the proposed methodology.     

Breaking Symmetries and Constraints: Transitions from 2D to 3D in Passive Walkers

The inherent dynamics of bipedal, passive mechanisms are studiedto investigate the relation between motions constrained to two-dimensional (2D)planes and those free to move in a three-dimensional (3D) environment. Inparticular, we develop numerical and analytical techniques usingdynamical-systems methodology to address the persistence and stabilitychanges of periodic, gait-like motions due to the relaxation ofconfiguration constraints and the breaking of problem symmetries. Theresults indicate the limitations of a 2D analysis to predictthe dynamics in the 3D environment. For example, it is shownhow the loss of constraints may introduce characteristically non-2Dinstability mechanisms, and how small symmetry-breaking terms may result inthe termination of solution branches.     

A Self-Tuning Evolutionary Algorithm Applied to an Inverse Partial Differential Equation

Evolutionary algorithms (EAs) are becoming increasingly popular tools for solving complex search problems. Their popularity in various problem domains has led to the introduction and development of numerous variants of two standard EA operators—crossover and mutation. Unfortunately, there are few if any effective guidelines for choosing which operators will be most effective in a given problem. In this paper, a self-tuning EA is introduced that employs several crossover and mutation operators simultaneously. The probability of using a given operator changes during the course of an evolutionary run whereby the most effective operators are selected based on which part of the search space is currently being explored. The self-tuning EA is used to solve an inverse partial differential equation—considered to be one of the more difficult problems in the realm of engineering mathematics. Results indicate that for the particular inverse partial differential equation considered, the self-tuning EA provides an effective solution methodology.     

基于Web的协同商标图案设计系统研究

图案的协同设计是计算机支持的协同工作的一个典型应用 ,针对纺织商标图案设计的要求 ,给出了一个基于 Web的协同商标图案设计系统的体系结构 ,重点阐述了在同步设计环境中基于事件驱动机制的多用户同步设计思想 ,并提出了一个基于动态的最高优先级策略来控制系统的并发     

三维钢结构CAD软件中的节点设计

介绍了面向对象分析与设计的基本思想，利用Factory Method设计模式，解决了钢结构节点设计CAD软件中节点多样的难题。该方法可以大幅度提高程序员的工作效率。     

设计模式中的面向对象原则及其子模式

在[Gamm95]中总结并提出了面向对象软件设计中非常重要的23个设计模式，这些模式尽管形态各异、目的不同，但它们都体现了相同的几个面向对象原则。该文讨论了这些面向对象的原则并对隐含在设计模式中的几个“子模式”进行了分析和总结。     

基于设计模式的EJB体系结构模型

文章提出了一种基于设计模式描述EJB体系结构的模型,详细地说明了EJBProxy模式和EJBFactory模式在其中的应用。通过使用这个模型,EJB组件及其重用过程变得更加易于理解,基于EJB组件的Web应用程序也变得更加易于开发和维护。