半定规划的齐次不可行内点算法

为降低半定规划(SDP)问题的迭代复杂度,并且有更好的数值实验结果,提出一种新的宽邻域上的齐次不可行内点算法.半定规划的KKT条件是单调互补问题(MCP),通过构造齐次模型(HMCP)以及提出新的宽邻域来解这个齐次模型,得到半定规划问题的最优解.这种算法容易判定原问题是否可行.在NT方向,证明迭代点在新的宽邻域内是收敛的,且迭代复杂度为O(√nlogL),其中n是SDP问题的维数,L=Tr(X⁰S⁰)/ε,其中ε是需要的精度,(X⁰,S⁰)是迭代起始点.这个复杂度比一般的半定规划不可行算法的迭代复杂度低.提供了数值实验,证明此算法比其他不可行算法具有更好的数值实验结果.     

The Importance of Multiple Representations of Mathematical Problems: Evidence from Chinese Preservice Elementary Teachers’ Analysis of a Learning Goal

This article describes a study of how Chinese preservice teachers unpacked a learning goal pertaining to adding fractions and understanding the concepts underlying the operation. Based on work in the USA by Morris, Hiebert, and Spizter (Journal for Research in Mathematics Education, 40(5), 491–529, 2009), 50 Chinese preservice teachers completed a task, anticipating an ideal student response, in the context of four representations: (1) fraction pieces, (2) graph paper, (3) common denominator algorithm, and (4) pennies. Like the US-based study, this study shows that Chinese preservice teachers’ ability to unpack a learning goal was highly influenced by how the problem was represented. The pennies and graph paper problems provided more supportive contexts for unpacking the learning goal; the algorithm problem provided the least supportive context. The main difference between the preservice teachers from these two countries was the US preservice teachers chose the pennies and graph paper problems as having the most potential for revealing students’ understanding of the learning goal; while the Chinese preservice teachers chose the algorithm problem despite the problem’s unsupportive context. Chinese preservice teachers’ preference suggests that they privileged algorithmic/symbolic representations over pictorial/concrete representations. Based on our results, we argue that it is time for cross-cultural comparative research to refocus on the common barriers, challenges, and benefits as related to mathematics teacher preparation and professional development. A cooperative instead of competitive orientation will lead to richer and deeper dialogues among mathematics educators.     

A suggested approach to a library building program

The preliminary building program suggested in this paper makes use of outlines, graphs, charts, and lists, rather than long-winded paragraphs, to describe the needs, objectives, and philosophy of the library. It is hoped that a short, concise, but detailed, report using these methods will save time and make the report more attractive to read, thereby encouraging the many people who will need to assist in the building planning to use the report.     

核心价值观认同下组织竞争力培育机理研究

知识分子是具有高度政治敏感性的群体,成功智力的开发在很大程度上受到核心价值观认同的制约。基于我国知识型团队的样本数据,借助于结构方程模型,经验性的解析揭示了核心价值观认同、成功智力和组织竞争力的内在关系,发现了核心价值观对成功智力的促进路径,以及对组织竞争力的促进机理,从而为知识型团队组织竞争力的培育提供了理论借鉴,并加强了价值观理论与传统管理学理论的融合。研究发现:情感认同和行为认同对分析型智力、创造型智力和实践型智力均存在着促进作用;分析性智力、创造型智力和实践型智力均对组织竞争力存在着促进作用。     

一个类Lorenz系统的混沌行为与形成机制

通过数值计算、理论推导分析了一个类Lorenz混沌系统的基本动力学特性,并通过数值仿真、相图、Poincare截面图和功率谱研究了这个系统的混沌行为。然后,构建一个受控系统并利用Lyapunov指数谱、分叉图分析了该系统混沌吸引子的形成机制。结果表明．该系统混沌吸引子可由两个卷形状演化为一个卷形状,并最终通过倍周期分叉的过程演化为周期运动的形状。     

企业专业化与集成管理—中国企业的两把金钥匙

随着改革开放的不断深入,中国的经济已有短缺经济转变为过剩经济,中国经济的调整由水桶理论决定的关键行业的调整变为全国宏观的经济结构的调整,企业竞争的环境日趋完善,人民的消费持续低迷。随着中国加入世贸组织,中国的企业该采取何种措施来应付日渐激烈的国际国内市场呢?能解     

基于胜任特征的大学生职业生涯管理研究

造成大学生就业困难的因素很多,但不能有效进行职业生涯规划与管理是其中的重要原因。基于胜任特征的大学生职业生涯管理主要包括基于胜任特征的职业生涯诊断、职业生涯目标确定和职业生涯的策略制定与实施三个步骤。将胜任特征理论引入大学生职业生涯管理领域,能够帮助大学生确定就业目标,将已经确定的就业目标进行分解。     

利用Java语言开发班级学生信息管理系统

Java语言是当今比较流行的网络程序设计语言,它的面向对象、跨平台、分布式等特点给编程人员带来了一种崭新的计算概念。本文主要是利用Java语言和Access数据库创建一个学生信息管理系统,让信息的管理实现自动化。