Physical class and attribute structure of system interfaces (which will equate to database structures where direct data access is the best or only option).
系统接口的物理类及属性结构(等同于数据库结构，在其中直接数据访问是最好或唯一的选择)。
In this paper we used star topology structure in the process of our simulation, it can work in coordination with the beacon mode, Data transmission using direct or indirect manner.
本文仿真过程中采用的是星型拓扑结构，协调器可以工作在信标和非信标模式下，数据采用直接或间接方式进行传输。
Now the existing direct volume CT methods face two difficulties:first, how to get the projection data to reconstruct the 3D image exactly, including whether the scanning structure is practical;
目前直接体积CT主要存在两大困难：一是如何获得三维图像精确重建所需的投影数据，包括扫描方式的可实现性；
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