安全数据库的理论研究主要集中在多级安全数据库、访问控制、数据库加密与推理通道控制等领域。
The theoretical research of the dependable database concentrates on the multi-layer safe database, access controlling, database encoding, channel control and so on.
第五章介绍了多级库存的理论，初步探讨了顾客退货模式下周期盘点的多级库存的控制问题。
Chapter five introduces the theory of multi-echelon inventory, with initiative discussion on multi-echelon inventory control of period replenish in the mode of goods rejection.
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