Passport 15000交换机在福建电力通信网中的应用

北电Passport15000交换机作为福建省ATM宽带数据广域通信网中的骨干节点，具有40Gbit／s的大交换容量，支持如ATM、帧中继、IP和话音等多种业务的综合数据交换平台。文中介绍了该设备的技术特点及应用情况，分析了对其实现保护投资的应用前景。     

FEM for evaluation of weight functions for SIF, COD and higher-order coefficients with application to a typical wedge splitting specimen

In the evaluation of accurate weight functions for the coefficients of first few terms of the linear elastic crack tip fields and the crack opening displacement (COD) using the finite element method (FEM), singularities at the crack tip and the loading point need to be properly considered. The crack tip singularity can be well captured by a hybrid crack element (HCE), which directly predicts accurate coefficients of first few terms of the linear elastic crack tip fields. A penalty function technique is introduced to handle the point load. With the use of these methods numerical results of a typical wedge splitting (WS) specimen subjected to wedge forces at arbitrary locations on the crack faces are obtained. With the help of appropriate interpolation techniques, these results can be used as weight functions. The range of validity of the so-called Paris equation, which is widely used in the evaluation of the COD from the stress intensity factors (SIFs), is established.     

定义在非闭集上的二人零和连续凸对策

在二人零和对策中,为了确保对策的值及最优策略的存在性,局中人纯策略集为闭集是一个至关重要的条件。本文讨论了一类定义在非闭集[a,b]×[c,d)或[a,b)×[c,d]上的二人零和连续对策,其最优策略的存在性问题。着重研究其赢得函数为凸(或凹)函数时,最优纯策略的存在性。     

加强我国金融机构反洗钱职能

随着全球经济一体化的发展，利用金融机构进行的洗钱活动日益猖獗，构建金融领域反洗钱运行机制是维护我国经济秩序和金融安全的迫切要求。在我国金融监管体制改革的时代背景下对金融机构反洗钱职能的探讨具有现实意义。     

基于统计的中文文本主题自动提取研究

文本主题自动提取是一种很有实用价值的技术，它可以有效地浓缩整个web页面，解决无线网络终端由于显示屏太小而无法显示整个网页的难题。总结了目前有关文本主题提取方面的研究成果，设计了一个特征词加权函数，在此函数中考虑了词所跨的段落数因子，同时采用非线性函数描述词长因子和词所跨的段落数因子的作用，并将加权函数应用于主题自动提取。实现了一个中文主题自动提取系统原型，通过对文本集的测试验证了加权函数的有效性。     

生产函数的数据标准化和社会必要劳动

为了定量地解决社会必要劳动的概念及其对商品价值的决定问题，提出了生产函数的数据标准化方法，推导出标准化平均生产函数，并将实物量、劳动量和价值量3种统计总量联系起来进行统一分析。运用数学模型说明了最终决定商品交换价格的是其价值——社会必要劳动，商品效用和供求关系只是其催化剂。     

基于神经元网络的快速监控功能

应用神经元网络理论和计算机仿真实验相结合的方法,对用快速监控理论解决带钢头部厚度超差问题进行了研究。针对板带材轧制过程是一个复杂的非线性过程,难以建立精确数学模型的问题,提出了用神经元网络实现快速监控功能的方法,仿真证明,该方法对于及时地消除厚度偏差的后遗性有着比其他控制方法更好的效果。     

High order finite difference methods for unsteady incompressible flows in multi-connected domains

Using the vorticity and stream function variables is an effective way to compute 2-D incompressible flow due to the facts that the incompressibility constraint for the velocity is automatically satisfied, the pressure variable is eliminated, and high order schemes can be efficiently implemented. However, a difficulty arises in a multi-connected computational domain in determining the constants for the stream function on the boundary of the “holes”. This is an especially challenging task for the calculation of unsteady flows, since these constants vary with time to reflect the total fluxes of the flow in each sub-channel. In this paper, we propose an efficient method in a finite difference setting to solve this problem and present some numerical experiments, including an accuracy check of a Taylor vortex-type flow, flow past a non-symmetric square, and flow in a heat exchanger.     

优化换向器冷锻模冲头锥角的显式目标函数

应用金属塑性应力、应变原理和数值分析中最小二乘法推导出了优化冲头端部锥角的目标函数凹模的最大工作应力和材料利用率的具体表达式，建立了具有显式目标函数的具体数学模型，能更深入分析冲头形状对模具结构及成形工艺的影响。     

对一类逆变器的数学模型和等效结构图的探讨

本文在特定条件下，通过对阶跃输入下ＦｖＲＯ１５Ｇ７Ｓ－４ＥＸ输出响应特性的分析和实际观测，提出了它的传递函数的数学模型和等效结构图。