【Key words】 Knowledge-Based Engineering； extended feature modeling； knowledge primitive feature； knowledge constraint； knowledge repository；
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知识性约束 Knowledge Type Constraints
Knowledge constraint modeling establishes a foundation to process the knowledge primitive model.
知识约束系统建模是对知识元特征模型进行知识处理的基础。
参考来源 - 基于知识的CAD系统若干关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
传统的图像配准的相似性测度函数对噪声过于敏感，且需要先验知识约束。
Traditional resemblance measurement function is application-restricted since it is too sensitive to noise and is subject to prior knowledge.
通过在目标函数中增加先验知识约束，我们可以解决波阻抗反演的病态问题及带限问题。
By introducing the prior information constraint in the objective function, we can solve the ill-posed problem and band-limited problem for the impedance inversion.
属性直方图是一种由先验知识约束的直方图，它可以使一些图像处理方法得到简化和变得可行。
A bound histogram is the histogram bound by some prior knowledge, and it can make some image processing methods be simple and feasible.
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