特征函数与分布函数之比较评价

本文从归纳总结分布函数和特征函数的重要作用入手,着重强调了它们之间有着重要的联系,通常我们认为分布函数可以决定特征函数,同时由唯一性定理知道特征函数也可以决定分布函数。但通过本文引入的反例,我们可以知道,唯一性定理在有限区间上不成立,不过在无穷限区间上我们仍可以说,分布函数和特征函数是一一对应的。     

Numerical prediction of statistical masonry wall fragment distribution induced by blast loading

The hazard caused by the fragments of damaged structures is usually significant in acci-dental explosions or hostile blast events.A reliable and efficient method to estimate probable fragment size,velocity and launch distance will be useful to assess and design countermeasures to mitigate the possible fragment hazards.This paper presents a numerical method for predicting the size and launch distance of the fragments caused by explosive damage of masonry wall.Numerical simulations with different scaled distances are carried out,and the statistical distribution functions of the fragment size and launch distance in terms of the scaled distance are derived.     

Autonomous optimal coordination scheme in protection system of power distribution network by using multi-agent concept

A protection system using a multi-agent concept for power distribution networks is pro- posed. Every digital over current relay(OCR) is developed as an agent by adding its own intelli- gence, self-tuning and communication ability. The main advantage of the multi-agent concept is that a group of agents work together to achieve a global goal which is beyond the ability of each individual agent. In order to cope with frequent changes in the network operation condition and faults, an OCR agent, proposed in this paper, is able to detect a fault or a change in the network and find its optimal parameters for protection in an autonomous manner considering information of the whole network obtained by communication between other agents.Through this kind of coordi- nation and information exchanges, not only a local but also a global protective scheme is com- pleted. Simulations in a simple distribution network show the effectiveness of the proposed protec- tion system.     

一个寿命分布类矩母函数上界的研究

研究了一个寿命分布类RNBUE的矩母函数,并给出了它的一个上界．     

土地一级开发利润分配模式研究

目前越来越多的开发商投入到土地一级开发中,而土地一级开发是房地产开发的第一个环节,也是土地开发的基础性环节。因此,研究中国土地一级开发过程中的利润分配问题及相关对策,对于维护国家利益、协调开发商与土地使用者之间的关系具有重要现实意义。     

IRA码在全息存储系统中的应用研究

前向纠错码(FEC)是全息存储系统提高系统容量的一项关键技术,不规则重复累积码是接近Shannon限且具有线性时间编译码算法的好码。首先研究了全息存储信道,提出了x平方律分布模型与不对称高斯分布模型;并将高性能的IRA码应用于全息存储系统,并进行了仿真研究。仿真结果表明:在全息存储系统中,IRA码的性能优于RS码等传统码,而且x平方律信道下的性能优于高斯信道。     

一类时滞神经网络的鲁棒稳定性分析

针对一类含有时变时滞和参数不确定性的神经网络,研究了它的鲁棒稳定性．利用线性矩阵不等式（LMI）方法,得到一个新的时滞依赖的结论,结论以线性矩阵不等式的形式给出,便于直接应用．最后的数值例子说明了所得结论的有效性和优越性．     

The role of feedback in changing organizational routine: A case study of Haier,China

The ability to change organizational routines according to the need of organizational transformation is difficult to achieve, but increasingly vital for an organization to survive in a highly turbulent business environment. However, despite fruitful research on organizational routines, how routines evolve through feedback remains unclear. This study aims to investigate the role of feedback in routine changes by examining a case study of Haier, the largest home appliance manufacturer in the world. The findings of this case show that feedback of a routine plays a critical role in routine changes. It highlights that feedback helps an organization to make sense of its behavior patterns and evaluate these patterns properly, which enable the organizations to better initiate and advocate routine changes that are necessary for a successful organizational transformation. Further, this case shows the importance of leveraging IT in managing routine changes.     

我国社科基金体育学立项项目的分布研究

通过对1997~2005年国家社科基金体育学立项项目的学科分布与地区分布的分析发现,体育学立项项目的学科与地区分布极不均衡,当引起有关管理部门的重视,建立合理的评审制度、科学的评价体系和科学合理的安排。同时,各地区也应整合研究资源,充分发挥学科优势,积极参与体育学研究,全面繁荣中国社会科学。     

最值公式在概率统计上的一个应用

通过一道概率统计题几种解法的对比,展示了初等数学不仅是学习高等数学的基础,还是高等数学习题技巧解法的源泉。