基于功能的系统关键要素识别

系统的总体功能是由各系统要素提供的功能实现的。哪些系统要素对于达到总系统的目标功能是关键的，对于系统的优化至关重要。本文在系统关键要素概念的基础上，利用图论理论和矩阵理论，研究了系统关键要素的识别过程，并针对不同的系统基本结构，得出了相应的推论。最后，通过实例说明了系统关键要素判定定理的实用性。     

一种多接口视频矩阵的系统集成方案及其实现

随着视频监控应用的日益广泛,新技术和新产品不断涌现.然而,视频监控系统的建设由来已久,各个时期的产品也将继续在各自岗位上长期发挥着重要的作用.如何充分整合现有视频监控资源和局域网络资源成为人们关注的问题,文章针对不同接口的视频矩阵提出一种系统集成方案,并给出了具体的实现.     

Behaviors and interactions of strengthening and constraint for ductile Nbss matrix in Nb–Si based alloys

The ductile matrix in composites could be strengthened by incorporating brittle inclusions, while the constraint effect for matrix would become more obvious and detrimental to material toughening. The balance between strengthening and toughening was crucial to achieve excellent comprehensive mechanical properties. Upon the basis of microstructure of Nb–Si in situ composites, a unit rectangular cell containing elastic and isotropic Nb₅Si₃ particles was modeled, the Niobium solid solution (Nb_ss) matrix according with the Ramberg-Osgood constitutive relation was recognized as elastic-plastic. For Nb–Si based alloys, the effects of volume fractions of Nb₅Si₃ reinforcements, stress states and interfacial characteristics on the stress-strain field, flow localization and damage evolution were investigated by the finite element method (FEM). Further, the normalized work of rupture (χ) was calculated quantitatively as a function of volume fractions of Nb₅Si₃ phase as well as yield strength of Nb_ss matrix. These results would contribute to acquire more fundamental understanding of the strengthening and constraint effects which were exerted by Nb₅Si₃ reinforcements to ductile Nb_ss matrix, also an instructive guidance for the optimum design of Nb–Si based alloys.     

基于矩阵变换器的双馈电机控制系统的研究

本文以双馈电机作为控告l对象,基于双馈电机定子磁链定向数学模型,采用矩阵变换器作为电机励磁单元,实施空间矢量调制。建立仿真模型,选取电机转速作为最终的控制目标进行仿真,结果验证了该模型的合理性及控制策略的正确性和可行性。     

结构损伤的智能诊断

本文介绍了结构损伤的动力学原理,总结了当前流行的关于结构损伤的神经网络的一般常识,并对结构损伤检测提出了一些有益的建议.     

一类完全Hash函数族的结构

Hash函数族是从有限集到有限集的函数的集合,任何一种编码都可以表示为一个Hash函数族,完全Hash函数族在密码学中有很重要的应用。本文利用矩阵和图论的方法研究了一类完全Hash函数族的结构,得到了N=3的一类完全Hash函数族的矩阵结构。     

价k_i（i≠0）均为2的交换结合Scheme

价是交换结合Ｓｃｈｅｍｅ的重要数量特征，有较强的组合性质，利用价来讨论某些交换结合Ｓｃｈｅｍｅ的构造与性质，是一个常用的方法．设＝（Ｘ，｛Ｒｉ｝ｉ＝０，１，．．．，ｄ）是一个类ｄ的交换结合Ｓｃｈｅｍｅ．ｋ０，ｋ１，．．．，ｋｄ是的价．本文证明了，若ｋ１＝ｋ２＝．．．＝ｋｄ＝２，则　是对称结合Ｓｃｈｅｍｅ．     

倒易晶格原胞的矩阵算法和利用Matlab绘制原胞图

视正格子原胞基矢和倒格子原胞基矢为线性空间的两个基底,提出了求解倒格子原胞的一种新的矩阵算法。在此基础上,利用Matlab软件实现了任意维次倒格子的求解和最常用的二维、三维晶格原胞的计算机绘图。     

Unclassed matrix shading and optimal ordering in hierarchical cluster analysis

A method is presented for the graphic display of proximity matrices as a complement to the common data analysis techniques of hierarchical clustering. The procedure involves the use of computer generated shaded matrices based on unclassed choropleth mapping in conjunction with a strategy for matrix reorganization. The latter incorporates a combination of techniques for seriation and the ordering of binary trees.Partial support for this research was provided by NIJ Grant #82-IJ-CX-0019 and NSF Grant #SES82-06067. The authors wish to acknowledge the assistance of Professors L.J. Hubert, R.G. Golledge, and W.R. Tobler.     

量子力学和数学中矩阵的记法问题

本文主要说明在各种情况下,如何正确写出矩阵,并解决了基矢和矢量变换中的有关问题。