Theory Based On Formal Concept Reduction And Application In Zhoushan Rice Yield

With the continuous development of China’s economy and the gradual enhancement of people’s living standards,however,the rice yield of our country has shown a downward trend in recent years.The emergence of this phenomenon has brought pressure and challenges to the grain supply.This dissertation mainly studies the theory and method of concept reduction based on concept discernibility matrix,studies the basic situation and influencing factors of rice yield system in Zhoushan City,explores and analyzes the rice yield of Zhoushan City,Dinghai District,Putuo District and Daishan County in recent ten years.Firstly,inspired by attribute reduction,the concept discernibility matrix is defined on the formal context.Based on this,a concept reduction method keeping the binary relationship unchanged is given.At the same time,the relationship between concept discernibility matrix and concept coordination set is studied,and the judgment method of concept coordination set is given by using concept discernibility matrix.Secondly,it studies the judgment methods of different types of formal concepts.The characteristics of core concepts,relatively necessary concepts and unnecessary concepts are discussed in detail by using concept discernibility matrix,besides,the judgment methods of different categories of formal concepts are given respectively.In addition,the steps of concept reduction are given.Combine with the theory basis,program and algorithms such as formal concept calculation,concept discernibility matrix construction and concept reduction output are designed and implemented.Then,the basic situation of Zhoushan City is introduced,the rice yield production and influencing factors of Zhoushan City as a whole and sub counties are analyzed,mainly including climate environment,planting area,irrigation and rural labor force.The problems and improvement measures of Zhoushan rice yield system are summarized.Finally,the rice yield data of Zhoushan City are deeply analyzed,the concept reduction theory and method are used to analyze the whole Zhoushan City,each county and district.Besides,the achievement of rice yield is obtained respectively.On the basis of concept reduction,relevant non-redundant rules are obtained to further explore the relationship between influencing factors and rice yield.