In this paper, from information security requirement analysis, constructing information security model is put forward through ring upon ring decomposing and progressively thinning method.
文章通过对信息安全的需求分析，提出了对信息安全需求用层层分解、逐步细化的方法来构造信息安全模型。
The method of constructing and progressively transmitting 3D terrain texture data based on multi-resolution progressive layers is put forward for the first time.
首次提出了基于多分辨率渐进层提取的三维地形模型纹理数据建立和渐进传输的方法。
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