...dimension reduction theory; nonlinear principal axis mapping; intrinsicdimension; design space visualizati[gap=302]关键词:设计优化;降维理论;非线性主轴映射;本征维数;设计空间可视化;优化轨迹 ..
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Based on the fractal theory and method, the reduction of dimension value before strong earthquake occurrence for self-similar earthquake distribution in time and space has been discussed.
基于分维理论和方法，讨论了自相似的地震时空分布的分维和强震前的降维现象。
Fuzzy rough set theory is an effective tool for reduction of data dimension, but there are few dimension reduction algorithms that are based on fuzzy rough set theory so far.
模糊粗糙集理论是解决数据集维数问题的有效工具，但基于模糊粗糙集的降维算法还不多。
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