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This paper proposes a data center business continuity risk grading model in a cloud environment, which determines the disaster recovery capability level of the target business system based on system attribute information, comprehensive basic level, system life cycle and return on investment, and determines the target business based on the disaster recovery capability level The business continuity protection mode of the system is to protect the target business system continuously according to the business continuity protection mode.

This study reviews and analyzes the problem of aging of books in university libraries. Indexes are proposed for judging the aging process including the aging time limit, the over-age book rate, and the aging rate. Based on these indexes, a mathematical model of the aging process is established, reduced to an algebraic equation, and calculated by a simple recurrence formula. The Mean Unit Price (MUP), an economic factor, is introduced. By using a dynamic model, a prediction of the time sequence of the MUP is made and a number of countermeasures are proposed for the control or retardation of the aging process. An index of economic benefit is introduced, using the principles of input-output analysis, for the appraisal of the effectivensess of the countermeasures