The Triadic Concept Analysis And Its Application In Marine Disasters

With the enhancement of China’s national strength,China’s coastal economic strength continues to improve,but also the coastal area suffered the most serious threat to marine disasters.The frequent occurrence of marine disasters has brought challenges to the economic development of coastal areas.This thesis mainly studies the construction and simplification of conditional attribute implications concept lattices,object oriented concept lattices,and attribute oriented concept lattices,and studies the basic situation of marine disasters in Zhejiang Province and the problems of disaster prevention and mitigation.This theory is used to analyze the losses caused by major Marine disasters of suffered by Zhoushan,Ningbo,Taizhou and Wenzhou in the past eight years.Firstly,the theory of construction and simplification of concept lattices is studied based on conditional attribute implications.A new formal context is constructed based on conditional attribute implications,and definitions of formal concept and concept lattice are given in the conditional attribute implication context.Then,the object reduction of the conditional attribute implication context is carried out,and the original object set is replaced with the set of minimal attribute implications of the formal context under each single condition.The simplified formal background and formal concepts are more concise and the concept lattice corresponding to the simplified context is isomorphic to the original concept lattice.Secondly,the necessary operator and possibility operator are introduced into the conditional attribute implication context to define the object oriented concept lattice and property oriented concept lattice of the new context,and construct simplified object oriented concept lattice and attribute oriented concept lattice.Then,the current status and problems of marine disaster prevention and reduction are analyzed.The general situation of marine environment in Zhejiang Province is introduced,and four major types of marine disasters and their basic conditions are studied to analyze the current status and problems of marine disaster prevention and reduction.Finally,the marine disaster data in 4 cities in Zhejiang Province are analysed.Using the triadic concept analysis and three types of conditional attribute implication concept lattices to analyze the losses caused by the major marine disasters in the 4 cities of Zhoushan,Ningbo,Taizhou and Wenzhou in the past 8 years,and find out their losses of marine disasters.