The new method USES DEA efficiency as a clustering standard and looks for DEA effective units step by step so as to cluster.
该方法以DEA有效为聚类标准，通过逐步寻找DEA有效单元的方法从而达到聚类的目的。
2
The primary contents are summarized as follows:Based on STEPstandard, a method to construct common auto-part product information model is discussed.
分析了基于STEP性能特征模型的汽摩配产品数据建模一般过程和实现方法。
3
The paper introduces a multi-level H-bridge converter, which produces 18-step waveform according to required control method. The standard sine waveform can be gotten after passing through the filter.