自由边界问题的非协调有限元逼近(英文)

本文讨论了薄板弯曲障碍问题的非协调有限元逼近,证明了一个稠密性定理,离散问题解的存在唯一性以及离散解对真解的收敛性,讨论了非协调有限元离散问题的迭代解法并证明了迭代序列对离散解的收敛性。     

Mean and Variance through Factorial Moments

This article shows how the use of factorial moments provides a simple, consistent yet elegant approach to finding the mean and variance of standard discrete probability distributions.     

Identifying Unobserved Hazard Functions in Discrete-Time Survival Mixture Analysis

This Monte Carlo simulation adds to the growing body of enumeration index performance research in continuous response variable mixture models by addressing the issue of the performance of these indexes in discrete-time survival mixture analysis (DTSMA) models. Results showed that although all enumeration indexes performed very well in identifying a homogeneous DTSMA model (i.e., k = 1 hazard function in the sample data), the findings also showed that the enumeration indexes performed poorly in identifying the correct number of unobserved hazard functions present in a heterogeneous (i.e., k = 3) DTSMA model. More important, the performance of the enumeration indexes for the heterogeneous DTSMA models did not improve as the sample size, the effect of time-invariant covariates, or adjacent hazard function separation distance increased, which is inconsistent with some previous Monte Carlo simulation results. The limitations of this Monte Carlo simulation study and future empirical investigation possibilities are both discussed.     

Mixed G<Emphasis Type="Italic">l</Emphasis><Subscript>2</Subscript>/G<Emphasis Type="Italic">H</Emphasis><Subscript>2</Subscript> multi-channel multi-objective control synthesis for discrete time systems

This paper proposes a new approach for multi-objective robust control. The approach extends the standard generalizedl ₂ (Gl ₂) and generalizedH ₂ (GH ₂) conditions to a set of new linear matrix inequality (LMI) constraints based on a new stability condition. A technique for variable parameterization is introduced to the multi-objective control problem to preserve the linearity of the synthesis variables. Consequently, the multi-channel multi-objective mixed Gl ₂/GH ₂ control problem can be solved less conservatively using computationally tractable algorithms developed in the paper. Project supported by the National Natural Science Foundation of China (No. 60374028), and the Scientific Research Foundation for Returned Overseas Chinese Scholars, Ministry of Education (No. [2004]176)     

离散数学多媒体教学的实践与认识

离散数学是我们学校立项的优秀课程，是一门覆盖多个专业的基础课程。本文主要讨论了离散数学课程实行多媒体教学的一些实践与认识。     

排序位移法证明一类离散不等式

文章给出一种证明一类离散不等式的新方法──排序位移法．     

论法国《教育法典》的教育平等原则：内涵、依据与功能

教育平等原则是法国《教育法典》的三个基本原则之一,具有四重内涵：保障受教育机会平等,通过援助等手段促进实质平等,确保包容性的学校教育,学生参与及社会参与。教育平等能够成为法国《教育法典》的基本原则,一方面具有历史依据,有利于法典保持基本原则和制度的稳定性;另一方面具有宪法依据,从而使这一原则具有充分的民主基础。教育平等原则在法国《教育法典》编纂中发挥了建立基本制度和产生具体规则的功能,真正贯穿于法典,支撑起法典的结构。     

反兴奋剂工作中的临时停赛规则评述

临时停赛是反兴奋剂工作中较为常见的管理手段，依托反兴奋剂规则体系的建设，临时停赛规则整体上体现出了一致性和灵活性兼备的特点。但由于《世界反兴奋剂条例》临时停赛条款关键内容的缺失，以及各反兴奋剂组织的反兴奋剂规则补充规定的不完善，临时停赛规则的一致性和灵活性相结合的优势未能获得充分发挥，不利于运动员权利的保护，也影响了国际反兴奋剂工作公平协调地进行。完善临时停赛规则应当强调《世界反兴奋剂条例》与各体育组织、反兴奋剂机构的反兴奋剂规则之间的“分工”，并重点关注临时停赛的适用标准、停止条件、违规后果、时长标准和赔偿规则等问题。我国的临时停赛规则存在实践适用较少、认定标准简单的问题，应当借鉴国际经验进一步完善相关规定，助力我国反兴奋剂事业的发展。     

一种基于混沌加密的视频水印方法

利用二维混沌流加密技术加密有意义的二进制图像,获得水印数据,以提高视频水印的安全性。水印嵌入过程中,水印被嵌入到随机选择的视频帧的离散余弦变换系数里。在鲁棒性和帧平均攻击实验后,大部分水印可以通过水印检测提取算法进行提取和识别。实验结果表明,这种视频水印方法具有一定的安全性、隐蔽性和鲁棒性。     

代码重用技术在财务管理系统开发中的应用

本文结合作者在多个财务管理系统开发中积累的经验,讨论了当前财务管理系统开发中代码重用方法,详细分析了利用VC++进行财务软件开发过程中实现代码重用的技术和方法,通过代码重用,提高了财务软件开发的生产率,降低了财务软件开发难度和成本,缩短了开发周期。同时,可重用技术有利于改善财务软件质量,有利于财务软件的升级与维护。