Evaluation System Based On Object-oriented Methods To Operate

In this paper, the application of Expert System in Process Operation is investigated. An appraise system of process operation, which consists of knowledge representation and inference engine, is designed according to the characteristics of Process Operation and is implemented using object-oriented technology.The knowledge of process operation possesses experiential property usually and is difficult to describe using compact method. The solutionof question is composed of a series of unattached operations. The knowledge and the method using knowledge are easy to separate. So the knowledge representation of the system can use the technology of production system. The production rule's are realized by object-oriented technology. The rules are expressed as objects. The object-oriented representation of knowledge is a composite of classes, objects and attributes. It can express static characteristics, dynamic actions and interrelation of objects. The hierarchy and composition of classes decrease greatly the redundancy of knowledge representation. The encapsulation of objects and the inheritance of classes promote updating and extension of knowledge, and make the management of knowledge easier. According to the characteristics of process operation, an object model is established in this paper.The process operation is usually in sequence, and the precondition and the conclusion of rules are described definitely, so the precise inference can be used in this system. The rule of matching the highest priority is a good solution to clear-up the conflicts of operations. The converse ratiocination is adapted also as the inference method of the system. With generality and extensibility, an inference class is build to make inference engine be independent on knowledge representation, sosystem can provide different inference engine by inheriting inference class.The operation rules of the heat transfer experiment and the pump experiment of distance laboratory system are established by analyzing the corresponding experimental operations, and the scores of operation steps are added into the system. As the examination system of experiment operation, the system grades the operations of students in experiments automatically to give the overall scores, which used to be a task of teachers tedious and poor-efficient.In the paper, the operation of an industrial reactor of methanol synthesis is also analyzed to establish a knowledge representation. It showed that the expert system can be used in the field of chemical industrial production.