The Research On Key Technology For Construction Of Apple’s Disease Case Base

Apple’s disease has a greater impact on apple yield and quality. China’s agriculturaltechnology sector has made great progress in the application of disease diagnosisand prevention of theoretical and applied researches. A wealth of experience playsan important role in the application of disease diagnosis and prevention. However,subject to the cultural level of the majority of farmers and the development ofagricultural economy, dissemination, communication and use of these experiencesare greatly restricted. Along with the rapid development of information technology,adopting appropriate artificial intelligence techniques to describe, store and useexpert’s experience, it is of great significance to improve apple disease diagnosisaccuracy and control effect and improve the apple output and quality.Case-based reasoning technology is the only one in all artificial intelligencetechnology which is based on experience. This paper mainly researches the keytechnologies about ways to describe, retrieve and preserve the experience in theform of case. The study includes a total of four parts. Firstly, the paper designs thestructure of case base management system, the case base, the case and the indextable, and combes a set of attributes that describe apple’s diseases. Secondly, thepaper researches how to get a subset of attributes from the complete attribute setto construct the case base index table. Thirdly, the paper researches how to retrievea case which is the most similar to the background of the new apple disease problemfrom the case base, the solution of the retrieved case can offer the reference for thenew disease problem. Fourthly, the paper researches how to convert a diseaseproblem to a case, and the update mechanism of the case base when a new casejoins in it, meanwhile, the paper researches the storage structure of the case basebased on XML technology. Innovations in this paper are as follows:1.The research on the key technology on the design of case base structure, astructure suitable for apple’s disease cases description is given. In this paper, thestructure of case base management system, the case base, the case and the indextable are designed, and a complete set of attributes that describe examples of applediseases is combed. The index table is the core of the case base, and this paperdesigns3-grades index table structure based on the features of the apple diseasediagnosis and prevention work, in which the cases have different sets of attributes.The attribute-distribution-value in Grade1index table is used to describe thelocation of each attributes in the cases. The index structure is case-oriented andattribute-oriented，reflects the details of the distribution of each attribute in the casebase and the whole value of each attribute for the case base. The index structure issystematic, hierarchical and flexible.2. The research on the key technology on attributes reduction in the index table,a algorithm used for attribute reduction based on rough set theory and genetic results as the main basis to determine the case reasoning performance, and adjusts the index table when a case is added or deleted from the case base after comparing the old and new two cases’reasoning performance. In addition, a case base storage structure which is suitable for agricultural production characteristics and modern network environment, and has strong high security presentation, good consistency and high security is proposed.