基于偏序的矿井导线网NF^2嵌套关系模型  

Study on non first normal form nested relation model of underground survey objects using partially ordered space

作　　者：陈宜金[1] 

机构地区：[1]中国矿业大学资源开发工程系,北京100083

出　　处：《湘潭矿业学院学报》2002年第3期1-4,共4页Journal of Xiangtan Mining Institute

基　　金：煤炭科学基金资助(编号:95采0206)

摘　　要：首先应用偏序空间理论,提出了井下测量对象的数据库论域命题,并论证了该命题的成立;然后提供了井下测量对象的NF2嵌套数据模型和测量对象的存储数据结构.根据上述理论、命题及数据模型和数据存储结构,提出了基于偏序空间的井下测量对象操作代数,最后给出了一个工程实例,验证了文中的理论和方法的正确性.图3,参5.In this paper, the underground survey objects are defined. We show the following proposition: If X is a domain of underground survey objects, and T is the control or transfer relation, then (X, T) is a partiallyordered space. The partially ordered space theory is applied to the underground survey objects and the database domain of the survey objects is setup: 1) any D which is belged to X is a database domain; 2) if D1,..., Dn are database doms, then their product is also a database domain; 3) if D1,...,Dn are database domains, then their sum is also a database domain. We also present a non first normal form nested data model and storage data structure for the objects. Generalized operations of the relation algebra for thurvcy objects are demonstrated. To test our theory, we discuss an engineering example in detail.3figs.,5refs.

关 键 词：矿井测量信息 偏序空间 数据库 嵌套关系模型 数据存储模式 

分 类 号：TD175[矿业工程—矿山地质测量]