论大学思想政治教育与当代大学生的个性培养

当代大学生的个性品质既有积极的一面,也有消极的一面。大学思想政治教育在当代大学生个性培养中应最大限度地抑制消极个性品质的影响,激发积极个性品质的发挥。     

独立董事独立性的文化悖论

独立董事制度在我国没有真正有效地发挥作用,究其原因在于独立董事的独立性没有得到保证。中国特有文化下形成的人的处世哲学和价值理念与独立董事独立性之间存在相悖之处是造成这一现象的原因。     

随机向量的相关与独立

归纳了判断随机向量独立性和不相关的方法.这些方法简化了随机向量独立与不相关的判定.讨论了应用这些判断方法的常见误区,并给出应用实例.对这些方法提出了扩充方向.     

Methods and instruments for designing S-boxes

The design of S-boxes with minimal mutual information between input and output subvectors (considered as random variables) is investigated. First, the conditional entropy of the value of a boolean function conditioned on its random arguments is expressed as a function of the Walsh transform of the function. The entropy profile of a function is then defined; it allows the comparison of functions with regard to their (conditional) entropies. An algorithm to construct functions with good entropy profiles is then presented. It consists of a stepwise improvement of randomly chosen functions and uses the relation between the Walsh transform and the (conditional) entropies of a function. The statistical independency of boolean functions is investigated in the final section.     

Efficient and robust shot change detection

In this article, we deal with the problem of shot change detection which is of primary importance when trying to segment and abstract video sequences. Contrary to recent experiments, our aim is to elaborate a robust but very efficient (real-time even with uncompressed data) method to deal with the remaining problems related to shot change detection: illumination changes, context and data independency, and parameter settings. To do so, we have considered some adaptive threshold and derivative measures in a hue-saturation colour space. We illustrate our robust and efficient method by some experiments on news and football broadcast video sequences.

略论独立董事作用发挥的条件

董事会建设是公司结构治理的核心。由于其独立性常常得不到保证，董事会易成为一个由内部人控制的组织。针对这一缺陷，从国内外对独立董事发挥作用的边界的界定入手，结合国内外对于独立董事制度的研究及国内外实践情况的分析，讨论了独立董事的产生机制，分析了独立董事发挥作用的内外部条件及对独立董事的约束机制，从而进一步认识到推行独立董事制度的意义。     

同一躯壳中的双生与双关

通过对阿塞沃和阿隆索（Acebo＆Alonso）的舞蹈学校和省立博物馆、MVRDV的乌得勒支孪生住宅与迪勒和斯科菲迪奥（Diller＆Scofidio）的Eyebeam艺术和技术博物馆三个双生建筑的分析,比较双生建筑在起始点、划分方式、联系形式和最终实施方面的异同,探讨双生建筑的双关性和独立性。     

基于十字形的改进新型频率选择表面

通过对传统的十字单元进行改进,设计了两种新型单元的频率选择表面( FSS)。利用谱域分析法,从理论上分析了传统十字单元和新型单元FSS,研究了TE 波入射时角度变化和大角度入射下极化方式变化对中心频率的影响。仿真结果表明：在TE 波从 0°～60°以不同角度入射时,传统十字单元的中心频率漂移为420 MHz,两种新型单元中心频率的漂移量分别为180MHz 和210MHz, 减少了1/2 以上;在45°不同极化方式的波入射时,传统十字单元中心频率的漂移量为990MHz,两种新型单元的漂移量为150MHz 和120MHz,减少了2/3 以上。与传统十字单元相比,两种新型FSS 单元均能实现TE 波入射时的角度稳定性和大角度入射时的良好的极化稳定性,为FSS 在天线雷达领域中的应用提供了基础。     

Automatic simplification of solid models for engineering analysis independent of modeling sequences

Although solid models can represent complex and detailed geometry of parts, it is often necessary to simplify solid models by removing the detailed geometry in some applications such as finite element analysis and similarity assessment of CAD models. There are no standards for judging the goodness of a simplification method, but one essential criterion would be that it should generate a consistent and acceptable simplification for the same solid model, regardless of how the solid model has been created. Since a design-feature-based approach is tightly dependent on modeling sequences and designer’s modeling preferences, it sometimes produces inconsistent and unacceptable simplifications. In this paper, a new method is proposed to simplify solid models of machined parts. Independently of user-specified design features, this method directly recognizes and generates subtractive features from the final model of the part, and then simplifies the solid model by removing the detailed geometry by using these subtractive features. This paper was recommended for publication in revised form by Associate Editor Jeong-Sam Han Yoonhwan Woo is an assistant professor of Mechanical Systems Engineering at Hansung University in Korea. He received his Ph.D. in Mechanical Engineering from Colorado State University in 1999, the M.S. in Mechanical and Aerospace engineering from Illinois Institute of Technology in 1995, and the B.S. in Precision Mechanical Engineering from Hanyang University, Korea, in 1993. He also has been a software engineer of ACIS development team in Spatial Corporation, USA. His research interests include geometric and solid modeling and computer aided process planning.     

基于线性无关度的稀疏最小二乘支持向量回归机

基于线性无关度提出了一种在高维特征空间中选择近似基的方法,并采用不完全抛弃法,充分利用非支持向量中的信息来建立稀疏最小二乘支持向量回归机的数学模型.另外,采用递推法加快了其模型的建立.该模型在保持预测精度基本不变的情况下,使支持向量的数目大大减少.最后,通过3个UCI数据集验证了该模型的有效性.