这些层次的数量和范围是定义完善的：我们有四个不同的层次：公司黑盒子、系统黑盒子、系统内的逻辑设计以及物理实现。
The number and scope of the levels are well defined: we have four distinct levels; company black box, system black box, logical design inside the system, physical implementation.
因此，本论文的主要任务体现在实验环境的构造及OAI各系统模块的逻辑设计和编程实现。
Therefore, it mainly focuses on the establishment of the lab environment and the implement of each system module of OAI open harvesting system.
在此基础上，进行系统知识库的概念设计、逻辑设计与物理设计。
Based on whole system frame, knowledge-base concept design, logic design and physical design began.
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