摘要
提出了一个基于对象关系数据模型的避让案例模糊数据库系统模型。该模型分为二级:用户级和系统级。其中引入了模糊技术和面向对象的方法,分别建立起了用于描述避让案例的数据库模型和用于描述系统模糊性的知识库模型,确定了相应的模糊数据表示形式,定义了各种模糊对象类型,重载并新增了相应的模糊操作算子,实现了模糊数据库上的查询功能。该模型具有更好的实用性和系统性,可以为船舶避碰提供更加有效的决策支持。
A fuzzy data base system model for collision avoidance cases based on objectrelational data model is presented in this paper. The fuzzy model has two levels: user level and system level. The fuzzy technology and objectoriented method are imported into it. A data base model describing collision avoidance cases and a knowledge base model describing fuzzy features of the system are built up, respectively. The fuzzy data representation forms are given, several kinds of fuzzy object types are defined, and some fuzzy manipulation operators are overloaded and added too. At the same time, the function of fuzzy data query are realized. This fuzzy model has even better practicability and systematicness, and can provide a more effective decision making support for ship collision avoidance.
出处
《中国航海》
CSCD
北大核心
2003年第4期38-42,46,共6页
Navigation of China
基金
上海市高等学校青年科学基金项目(10 289)
