代表算法有：BIRCH算法、CURE算法、CHAMELEON算法等；3. 基于密度的方法(density-based methods):基于密度的方法与其它方法的一个根本区别是：它不是基于各种各样的距离的，而是基于密度的。
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Methods: White matter density was compared among three groups by voxel-based morphometry.
方法：用基于像素的形态学测量法比较三组的白质密度。
All the nonlinear normalization methods resolve the above distortion based on density equalization, and differs on the stroke density description.
各种非线性规范化的共同点在于它们都是基于密度均衡来解决上述变形，区别在于对笔画密度的描述不同。
Based on the analysis of the perforation applicability, sand production mechanism of formations, and sand control methods in production, a new method of sand control using high shot density was given.
对射孔器和射孔器适用性，地层出砂机理以及目前现场使用的各种防砂方式进行分析，提出了利用高孔密射孔进行防砂的思路。
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