Modified minimum covariance determinant estimator and its application to outlier detection of chemical process data

To overcome the main flaw of minimum covariance determinant (MCD) estimator, i.e. difficulty to determine its main parameter h, a modified-MCD (M-MCD) algorithm is proposed. In M-MCD, the self-adaptive iteration is proposed to minimize the deflection between the standard deviation of robust mahalanobis distance square, which is calculated by MCD with the parameter h based on the sample, and the standard deviation of theoretical mahalanobis distance square by adjusting the parameter h of MCD. Thus, the optimal parameter h of M-MCD is determined when the minimum deflection is obtained. The results of convergence analysis demonstrate that M-MCD has good convergence property. Further, M-MCD and MCD were applied to detect outliers for two typical data and chemical process data, respectively. The results show that M-MCD can get the optimal parameter h by using the self-adaptive iteration and thus its performances of outlier detection are better than MCD.     

认知语法配价关系探究

从对应关系、侧重决定体、概念自主和依存关系及成分组合关系四个方面,尝试对认知语法配价关系理论的核心思想和实际运作进行初步剖析,从中发现对应关系在认知语法配价关系中具有恒定性;而侧重决定体、概念自主和依存关系及成分组合关系则复杂和多变。应根据构式在句中的地位、语义指向、语用信息及社会知识和经验,辩证地理解构式之间的内在联系及联结动因。     

关于四元数体上重行列式以及Schur公式

本文在[1][2]的基础上，首先讨论四元数体上的Hermite矩阵的行列式的性质。然后讨论重行列式的性质，对于重行列式，完整地给出了相应于域上行列式的基本性质。最后可把复数域上著名的Schur公式推广到四元数体上。     

Wrongsky行列式与线性常微分方程通解的结构

在讨论函数组的线性关系时,Wrongsky行列式是否为零成为函数组线性相关或线性无关的必要条件,这种必要条件在函数组条件加强为n阶线性常微分方程的一组特解后,即得到函数组线性相关或线性无关的充分且必要条件,成为确定n阶线性常微分方程的通解的结构的重要依据。     

The distribution of random determinants

The exact distribution of |Δn| where Δn is a random determinant with independent and identically distributed exponential elements is given for the cases n = 2 and 3. From the investigation of the behaviour of the density functions for these cases it is conjectured that for any fixed n, the probability density of |Δn| for large values of the argument is the same as the density of (Y/n)ⁿ, where Y is a gamma random variable.     

Fuzzy矩阵代数的进一步研究

本提出了在取大，取小算子下的行列式问题，给出了若干性质和定理，其中这个定理指出了矩阵乘积的行列式不等相应的行列式的乘积。这是个区别于高等代数的结果。     

关于正定自共轭矩阵的Kronecker乘积与Hadamard乘积的行列式的界限研究

本文给出了正定自共轭矩阵的Ｋｒｏｎｅｃｋｅｒ乘积与Ｈａｄａｍａｒｄ乘积的行列式的界限的不等式,推广改进了相关文献结论．     

线性周期系数系统的稳定性

利用顺序主子式判别法得到线性周期系数系统的稳定性．     

Cramer法则与Vandermonde行列式的应用

本文利用Cramer法则与Vandermonde行列式的结果,推导出了Lagrange插值公式以及一些缺项的多项式的表达式。这是对Cramer法则与Vander－monde行列式行列工的一个很好的综合运用。