The deep research on depreciation method of double decline balance;
双倍余额递减折旧法的深入研究
Preliminary Study on Development of Management System for Information Related to the Remaining Amount of Materials;
物质余额信息管理系统开发初探
This paper mainly discusses some distributions of the risk process with stochastic return on investment,including some properties of supremum distribution and surplus distribution,and deduces the formula for them and ruins probability and investment strategy.