| Agriculture expert system - agricultural intelligent system is a computer system which adopted Knowledge Engineering. It combined sophisticated high technology such as the multimediax information network and knowledge acquisition, integrated the special knowledge and experience which be offered by one or more agricultural experts to simulate the decision-making course of complicated agricultural problem. This thesis introduced the research and development of protected horticulture Expert system of vegetable planting. During the building process of expert system, it combined the oriented modeling- method - UML, simplified the process of modeling, improved the design efficiency , standardization and practicability of the system.Knowledge representation is the formalization of knowledge. It not only redounds to agricultural expert summarizing the system knowledge, but also can improve the efficiency of inference engine. This thesis, with the characteristic of knowledge in diagnosing and forecasting, adopted a knowledge representation with tree-mode or reticulation which be fitted to inference engine. For a long time, agricultural knowledge is so complicated that it can't be classified effectively, making knowledge-database redundant largely, Data Warehouse is an data aggregation which including knowledge decision-making, subject-orientation, integration, variation promptly and permanence. This thesis put the knowledge of integrated database into the knowledge-database after analyzing the Subject-Orientation during the construction of knowledge-database, completing the operational efficiency of knowledge-database, simplifying the process of inference. Expert system of vegetable planting of dependency provided the friendly user interface. Through the maintenance of the integrated database by the Domain expert, the system can provide a variety of preventive advice and can introduce the planting and management technology systemically during the planting course of vegetable.
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