In this paper , a discussion of construction of the knowledge base by the relational model is presented . we analyze the knowledge into groups , each one called a knowledge point . then , use rm to organize the knowledge points to form two databases ; one is called the attribute database , and the other called linkage database 同時(shí)教學(xué)系統(tǒng)還必需具有大量多媒體數(shù)據(jù)的管理能力,學(xué)科知識(shí)庫(kù)與教學(xué)材料庫(kù)結(jié)合也是一個(gè)重要問(wèn)題。本文使用關(guān)系模型討論建立學(xué)科知識(shí)庫(kù)的方法。首先把學(xué)科知識(shí)分解為知識(shí)點(diǎn),用關(guān)系模型來(lái)組織知識(shí)點(diǎn),形成知識(shí)點(diǎn)屬性庫(kù)和鏈接庫(kù)。
Secondly , using the design method of relational database , we construct the relational model of this system and do research on the storage pattern of geometric information of the parts in database . we present a method for recording the geometric information of standard parts based on the data file and this method not only makes it convenience to manage and service the database but also makes it easy to extend spl 其次,利用關(guān)系數(shù)據(jù)庫(kù)的設(shè)計(jì)方法,建立本系統(tǒng)數(shù)據(jù)庫(kù)關(guān)系模型,并對(duì)數(shù)據(jù)庫(kù)中零件幾何信息的存放方式進(jìn)行研究,提出以數(shù)據(jù)文件記錄標(biāo)準(zhǔn)件幾何信息的方法,方便數(shù)據(jù)庫(kù)的管理和維護(hù),使得標(biāo)準(zhǔn)件庫(kù)易于擴(kuò)充。
The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by Edgar F. Codd.