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Knowledge representation is a key problem to set up a expert system.Knowledge representation will directly affect its storage?maintenance?retrieve and inference efficiency. In this paper a method of power system knowledge representation based on amalgamation of frame/generalized rule and database is proposed, expert system is combined commendably with artificial neural network (ANN) an fuzzy theory by using this method. Share?acquisition?management and parallel usage of knowledge is realized based on client/server... Knowledge representation is a key problem to set up a expert system.Knowledge representation will directly affect its storage?maintenance?retrieve and inference efficiency. In this paper a method of power system knowledge representation based on amalgamation of frame/generalized rule and database is proposed, expert system is combined commendably with artificial neural network (ANN) an fuzzy theory by using this method. Share?acquisition?management and parallel usage of knowledge is realized based on client/server by using internet/intranet and large database. It is a solution of expert system knowledge representation in internet/intranet and knowledge representation of combination of expert system ?ANN and fuzzy theory. This method has good universal and practicability. 建立专家系统的一个关键性问题是知识表示 ,知识表示合理与否直接影响到知识是否便于在计算机中存储、维护、检索及推理效率。为此 ,根据电力系统自身特点 ,本文提出了一种基于框架 /广义规则及数据库融合电力系统知识表示方法 ,该知识表示方法将电力系统中专家系统、神经网络、模糊理论巧妙熔合。利用计算机网络及大型数据库 ,基于客户 /服务器方式实现了分布式知识的共享、获取、管理及并行使用 ,很好地解决了网络时代专家系统知识表示以及专家系统与神经网络、模糊理论相结合知识表示等难题。这种方法具有很好的通用性、实用性。 The paper gives a research on how to process XML files by DOM in Java servlet,and integrate XML and database to implement separation of client interface and data process, content and display of data. Finally, an example is presented to demonstrate its steps of implementation and correlative key technology and make full use of storage of database and high efficiency of transaction of XML files in the practical project. 文章研究了在JavaServlet中如何利用DOM接口操纵XML文件,并将XML与数据库融合在一起,实现用户界面与数据处理、数据内容与显示的完全分离的技术方法。并通过实例论述了实现步骤及相关的关键技术,在实际项目中充分发挥了数据库数据存储的优势和XML文件传输的高效性。 Shiphandling simulators are widely used in assessment of navigational safety of waterways and channels. According to the needs of three-dimensional vision in the simulation assessment, an effective procedure of 3D vision modeling was developed. Special techniques were investigated for constructing databases of natural scenes, buildings on land, navigational aids, and water surface vehicles. To ensure accuracy of the 3D data, attention was paid to proper processing of digital hydrographic data and digital elevation... Shiphandling simulators are widely used in assessment of navigational safety of waterways and channels. According to the needs of three-dimensional vision in the simulation assessment, an effective procedure of 3D vision modeling was developed. Special techniques were investigated for constructing databases of natural scenes, buildings on land, navigational aids, and water surface vehicles. To ensure accuracy of the 3D data, attention was paid to proper processing of digital hydrographic data and digital elevation model data, as well as data of engineering designs. Methods of integrating these databases were introduced to construct complex navigational scenario with high fidelity, and an object oriented database model with hierarchical structure was built to allow level-of-detail rendering and flexible display of dynamic or moving objects. The technologies developed have been applied to more than ten practical projects and the successful results have been obtained. 船舶操纵模拟器已经广泛应用于港航设计论证中,针对通航评估模拟对三维视景系统的要求,提出了一套有效的三维视景建模流程,特别是研究了自然景物、岸上建筑、助航标志和水上船舶的数据库建模技术,对电子海图数据、数字高程模型(DEM)数据和工程设计数据进行有效处理以确保三维视景模型的精确度。介绍了整个数据库的融合技术,从而构建高逼真度的虚拟航海环境。采用面向对象与层次型相结合的三维数据结构建立视景数据库模型,利用层次细节(LOD)和动态物标数据管理技术提高视景显示的速度和灵活性。这套技术已经成功应用于10多项港航设计论证项目的实际研究中,取得了较好的效果。
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