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)。

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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。

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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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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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