Study Of Active Fuzzy Relation Database

There is much fuzzy information in the world that filled with fuzzy things. It is impossible to describe fuzzy information for traditional database. Obviously, This is a large shortfall.In addition, when people change, insert or delete the data of tradition database, they had to actualize their aim through the corresponding command or operation, the system itself won't do anything actively according to the condition of database, on the one hand, the database has played more and more important function in many fields, on the other hand, the traditional database can only serve passively. Thus a new conflict was arisen.A new kind of database called active fuzzy database is presented on the basis of the traditional relation database, this kind of database not only has the merit of dealing with fuzzy information, but also has the active character that the traditional database hasn't. Thus, the active fuzzy database could satisfy the people's fuzzy and active requirements.First, an active fuzzy database model is constructed based on the relation database in this thesis ,and many fuzzy relation operations such as fuzzy projection, fuzzy selection and fuzzy connection are described and discussed in detail on the basis of the model.Second, fuzzy events regulation base and the way which adopting the mode of fuzzy relation database to actualize active character is presented in this thesis. Then, the active fuzzy relation database language is discussed, and the differences between database language and program design language, which describe the radical difference of the active quality between in this database and in the applied program are distinguished.Finally, how to manage this active fuzzy database is discussed. Two structures, arrangement structure and module structure, of this database management system are given. And several kinds of channels of actualizing active fuzzy relation database system are discussed.