The Research Of Similarity Of Mechanical Accessories In Mechanical-Resouce Database

Introduce the technology and theory of similarity. Analyze the Status quo and development of the similarity in China and Abroad. Applying similarity theory, analyse the mathematic model, expatiate the concept of similarity cell, deduce the scale coefficient of character value and similarity formula and indicate that similarity formula is the core of research of similarity.Based on the similarity theory, analyze a concept -relativity, closely related to similarity. Introduce the difference and relation between them. Indicate the complexity of estimating similarity. By the analysis of relativity, indicate that the estimation and analysis of similarity can be divided into two aspects: the point of view of system and user. And consider that the point of view of system mostly emphasizes on the interior characters and attributes of things and the point of view of user does on human beings factors.Analyse the primary characters of common mechanical accessories. Based on the viewpoint of similarity-estimating, they are divided two types: interior characters and attributes and user-related characters and attributes. Interior characters and attributes include information of figures and materials. User-related characters and attributes include acessories' name, serial numbers, sizes, function and standards and so on. Based on analysis above, define the similarity of mechanical accessories, which have been standardlized, serialized and universalized.Based on the research of definition of mechanical accessories, synthetically applying the pricinple of similarity science and the theory of relation database, analyse and study the traits of data organization of mechanical database.Enduce four conclusions: in mechanical database, accessories are standard, universal and serialized; the definition and configuration of lists are completely same; in the estimation of similarity, only need to compare the NUMBER(p,n) and VARCHAR2 type of data. Based on the analysis of characters of mechanical accessories in mechanical database, deduce the formula of similarity suited to mechanical accessories in mechanical database and introduce the concept of distance and value range. In this formula, the parameter of relation is setupped And indicate the meanings of each parameter.While arithmetic is realized, it is decomposed into several parts of functionmodules. Every module is realized by functions. This can realize the modularization of arithmetic and enhance the haleness of arithmetic. By the tool of application development in Oracle database system, Pro*C/C++, bed SQL and PL/SQL language into C language, realize each function module in Visual C++ 6.0.The application of arithmeticv is based on J2EE, developed by JBuild 6.0, including conception, structure of system and system's function.