对于这样一个高维数、非线性的小样本问题，许多传统的模式识别方法都容易出现过学习或欠学习现象。
When solving this small sample problem with high dimension and nonlinear, many traditional pattern recognition methods will tend to occur overfitting phenomenon.
机械系统的欠驱动特性是指系统控制输入向量空间的维数小于系统广义坐标向量空间维数的情况。
The underactuation of mechanical systems means that the dimension of the control vectors of systems is less than that of the configuration vector of systems.
针对目前欠定盲分离问题中源数未知，采取“两步法”进行分离源信号。
The two-step approach is often used to separate sources in underdetermined blind separation problem.
摘要 ：针对马赫数为1.95的欠膨胀超声速喷流声辐射特性，采用高精度计算格式的大涡模拟（LES）方法进行数值研究。
Abstract : Acoustic radiation from a supersonic underexpanded jet with a designed exit Mach number 1.95 is investigated using large eddy simulation (LES).
摘要 ：针对马赫数为1.95的欠膨胀超声速喷流声辐射特性，采用高精度计算格式的大涡模拟（LES）方法进行数值研究。
Abstract : Acoustic radiation from a supersonic underexpanded jet with a designed exit Mach number 1.95 is investigated using large eddy simulation (LES).
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