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The research situation of methods about the logistics strategy optimization and simulation modeling was introduced. The optimization and control strategy of multi-level inventory were discussed to deal with uncertain factor which affect multilevel inventory management. The simulation algorithm of system was designed using discrete event simulation method.
Soil erosion process, which is affected by both natural and artificial factors,is extremely complicated. This article selects SPOT5 remote sensing image, rainfall, DEM and soil data and other related material in the three gorges reservoir area in 1992 and the 2002, extracts soil erosion every environment factor information by using 3S technology, and makes stastical analyzation of the soil erosion...
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