机械产品CAD系统设计需求动态响应法研究

介绍一种机械产品ＣＡＤ系统初步设计的新方法－需求动态响应地。该方法以面向 系统分析和设计方法为指导思想，针对机械产品ＣＡＤ系统用户的需求特征及动态变化的共性，结合成组技术的核心思想，通过建立用户需求分析模型，完成需求特征的分类和确定；建立了用户需求与软件开发目标的映射模型，实现用户需求向软件功能目标的映射，再通过需求与软件目标对象的动态偶联，实现机械产品ＣＡＤ系统设计对用户需求的动态响应。     

基于分水岭变换的遥感影像面向对象分类

为了提高面向对象分类的自动化程度,提出将分水岭变换与ISODATA聚类相结合对遥感影像进行面向对象分类。首先利用改进的分水岭变换对高分遥感影像进行分割,获得分割的对象后,利用ISODATA聚类方法对其进行分类。试验结果表明,该方法取得了较好的分类效果,且分类速度快,一定程度上提高了遥感影像分类的自动化。     

面向对象的高分辨率遥感影像城市地物信息提取研究

以沈阳东陵区IKONOS影像为实验数据,采用面向对象分类,构建包含光谱特征、几何特征、纹理特征、拓扑关系等规则的知识库,对城市地物信息进行提取,并将其与基于像素方法的分类结果进行对比分析。研究结果表明：基于多尺度分割的面向对象的分类方法可以有效地避免传统的基于像素分类时出现的＂椒盐＂现象,分类结果更加符合人类的思维方式,更接近真实值,总体分类精度达到92.5%,比基于像素分类方法更适合作为城市地物专题数据库更新的有效方法。     

基于J2EE实验室管理系统的设计与实现

为了减轻实验室管理人员的日常管理工作,科学、规范地进行实验室管理,设计与实现了实验室管理系统。该系统采用基于J2EE的MVC框架来实现,使用面向对象方法进行系统设计,并对系统中的主要类进行了说明。该系统的应用提高了工作效率,使得实验室资源与设备得到充分的利用。     

面向虚拟企业的管理信息系统的研究

在分析虚拟企业特点的基础上，提出了一种面向虚拟企业的新型管理信息，并对其逻辑模型以及支撑技术Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ／Ｅｘｔｒａｎｅｔ、面向对象技术、系统安全等进行了研究。     

Replicated Case Studies for Investigating Quality Factors in Object-Oriented Designs

Thispaper aims at empirically exploring the relationships betweenmost of the existing design coupling, cohesion, and inheritancemeasures for object-oriented (OO) systems, and the fault-pronenessof OO system classes. The underlying goal of this study is tobetter understand the relationship between existing design measurementin OO systems and the quality of the software developed. in addition,we aim at assessing whether such relationships, once modeled,can be used to effectively drive and focus inspections or testing.The study described here is a replication of an analogous studyconducted in a university environment with systems developedby students. In order to draw more general conclusions and to(dis)confirm the results obtained there, we now replicated thestudy using data collected on an industrial system developedby professionals. Results show that many of our findings areconsistent across systems, despite the very disparate natureof the systems under study. Some of the strong dimensions capturedby the measures in each data set are visible in both the universityand industrial case study. For example, the frequency of methodinvocations appears to be the main driving factor of fault-pronenessin all systems. However, there are also differences across studies,which illustrate the fact that, although many principles andtechniques can be reused, quality does not follow universal lawsand quality models must be developed locally, wherever needed.     

SUB-OPTIMAL MASK SEARCH IN SAPS

Abstract

In this paper, a new and very simple algorithm for mask search in SAPS (System Approach Problem Solver) is introduced to illustrate a sub-optimal approach. It is intended to be used as an alternative of the optimal mask optimization present in previous versions of SAPS.

The algorithm described in this paper illustrates the general use of non-optimal search strategies. It is based on the hill-climbing strategy and as such it is not exponential as in all known previous versions of SAPS, but polynomial in nature. This results in an improved executing speed; very complex systems that were intractable with previous versions of SAPS can be handled with additional flexibility. The previous (exponential) algorithm is also implemented. Hence, comparisons and benchmarks are possible because of the same object-oriented environment. The main focus in this paper will lie on the justification for sub-optimal mask search techniques and its illustration with the algorithm     

一种新的面向对象概念格属性约简方法

为了研究概念格的属性约简方法，提出了面向对象概念格的可简化属性和不可简化属性，并研究相关性质。给出了面向对象概念格知识约简的判定定理，及相应的面向对象概念格约简方法。本文提出的属性约简方法，不用建立在差别矩阵上面，便可得到形式背景的约简集。     

组件技术在电力系统中的应用

面向对象代码重用由于其固有的局限性 ,未能根本上解决电力系统应用软件重复开发和维护困难等问题。介绍了组件软件技术的基本思想及其代码重用的优越性和构建大型应用的灵活性 ,并编制了故障计算实用组件。组件对象模型是电力系统应用软件的标准化方向。IEC(国际电工委员会 ) 6 1970系列标准及CIM (公共信息模型 )CIS(组件接口规范 )以组件对象模型为基础 ,将EMS应用程序的研制规范化。     

继电保护专家系统中知识的面向对象表示法

比较了几种常用知识表示方法的优缺点 ,论述了面向对象知识表示法是非常适合于电力系统的先进的知识表示法 ,提出了一种将知识库和推理机相分离的新型面向对象知识表示法。结合一个实际的继电保护运行管理专家系统的研究开发 ,全面说明了该表示法中封装、继承、多态、消息发送、规则推理等技术的应用。