第二章主要介绍了现有的两种最重要的网格体系结构，即五层沙漏结构和开放式网格服务体系结构(ogsa)。
It firstly introduces two kinds of existing architecture: the Layered Grid architecture (LGA) and the Open Grid Services architecture (OGSA).
面对这一挑战，文章提出构建知识元语义网格平台，实现以知识元为知识单位的知识发现服务体系结构。
Affront this challenge, the new problem of knowledge element Semantic Grid of the platform of knowledge service and knowledge discovery is the design.
面对这一挑战，文章提出构建知识元语义网格平台，实现以知识元为知识单位的知识发现服务体系结构。
Affront this challenge, the new problem of knowledge element Semantic Grid of the platform of knowledge service and knowledge discovery is the design.
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