基于校园网实用排课系统的开发与研究

分析了基于校园网的排课系统需求,研究了该系统各功能模块的主要作用,并指出该管理模式是现代化教务管理的一种重要形式。     

麦克风阵列二维方向估计聚焦算法研究

聚焦算法是解决宽带信号方向(DOA)估计问题的重要算法。常规的宽带聚焦算法需要进行预估计和多次迭代,算法的计算复杂度较高。该文根据宽带聚焦算法的思想,结合语音信号的特点,以各频率点的频域相关矩阵和聚焦点的相关矩阵的均方误差最小为最优化准则,提出了一种不需要预估计和迭代的二维宽带聚焦算法。该算法实时性好、计算复杂度低。采用八元均匀圆环麦克风阵列,仿真验证了该算法的良好二维DOA估计性能。     

基于均匀圆阵的相干信号波束形成方法

提出一种新的相干波束形成方法,利用内插变换对相干背景下的真实阵列进行虚拟平移,得到多个虚拟平移后的信号协方差矩阵;对其进行平均后,所得到的相干信号协方差矩阵具有满秩性。利用一般的波束形成法求出最优权向量。该方法解决了五阵元均匀圆阵下二维相干信号的波束形成问题。计算机仿真表明该方法在小快怕数及低信噪比时能很好地抑制相干干扰,对期望信号和相干信号方向估计误差具有较强的稳健性。     

用GAL16V8设计单片机键盘

提出一种利用通用逻辑阵列ＧＡＬ１６Ｖ８设计单片机常用的２×８键盘的设计方法，并给出用ＣＵＰＬ语言编写的编程程序     

Two-level Orthogonal and Saturated Designs for Estimating Main Effects and Certain Important Interactions

In a two-level factorial experiment, we consider orthogonal designs that allow joint estimation of the grand mean, all main effects, and certain classes of two-level interactions, assuming that the remaining effects are all negligible. Based on a judicious allocation of the factorial effects of interest to the columns of a Hadamard matrix, we propose some general classes of orthogonal and saturated designs which include some existing orthogonal main-effect plans of asymmetric factorials as special cases.     

Construction of nested space-filling designs using difference matrices

Experiments that study complex real world systems in business, engineering and sciences can be conducted at different levels of accuracy or sophistication. Nested space-filling designs are suitable for such multi-fidelity experiments. In this paper, we propose a systematic method to construct nested space-filling designs for experiments with two levels of accuracy. The method that makes use of nested difference matrices can be easily performed, many nested space-filling designs for experiments with two levels of accuracy can thus be constructed, and the resulting designs achieve stratification in low dimensions. In addition, the proposed method can also be used to obtain sliced space-filling designs for conducting computer experiments with both qualitative and quantitative factors.     

A two-stage method for the estimation of global sensitivity indices of non-parametric models

This article aims to propose a method to effectively estimate global sensitivity indices under non-parametric models. The new method involves two stages. First, all the non-influential sensitivity indices are filtered out by an adjustive W-statistic test process with low cost, and then the remaining significant sensitivity indices are precisely estimated by an orthogonal array (OA) with large number of levels and low strength. The method avoids complicated prototype building and shows a much lower experimental cost. The performance of this method as well as comparisons with polynomial regression method, Gaussian Process (GP) method, and component selection and smoothing operator (COSSO) method are tested on three numerical models that are widely used in engineering and statistical areas. Finally, a real data example is analyzed.     

Balanced arrays and main-effect plans from regular group-divisible designs

A method of constructing balanced arrays of strength two and corresponding main-effect fractional factorial plans from some regular group-divisible designs is presented. Main-effect fractional factorial plans for three-level factorial experiments are constructed. The plans have reasonably high efficiencies for different single degree of freedom effects.     

坚实信号处理的半无穷维二次优化方法

采用普通方法设计的传感器阵列处理器对有用信号参量的变化极为敏感,有用信号参量的微小变化均可能引起处理性能严重下降。本文讨论阵列处理器的一种坚实性设计方法。这种方法将阵列处理器设计问题转化为半无穷维二次优化模型。该模型使输出功率最小化,通过选择约束来确保有用信号响应,从而允许有用信号可在一定范围内变化以实现坚实性。最后,文中给出了一个用该方法设计的天线阵列处理器的例子,证明了该方法的有效性。     

On some optimal fractional 2m factorial designs of resolution V

This paper presents the trace of the covariance matrix of the estimates of effects based on a fractional 2^m factorial (2^m-FF) design T of resolution V for the following two cases: One is the case where T is constructed by adding some restricted assemblies to an orthogonal array. The other is one where T is constructed by removing some restricted assemblies from an orthogonal array of index unity. In the class of 2^m-FF designs of resolution V considered here, optimal designs with respect to the trace criterion, i.e. A-optimal, are presented for m = 4, 5, and 6 and for a range of practical values of N (the total number of assemblies). Some of them are better than the corresponding A-optimal designs in the class of balanced fractional 2^m factorial designs of resolution V obtained by Srivastava and Chopra (1971b) in such a sense that the trace of the covariance matrix of the estimates is small.