含有纯滞后对象的控制方法

评述纯滞后对象控制的两种典型方法─—大林算法和纯滞后补偿法的原理、优缺点、设计要求及存在问题，并讨论了两者的联系。     

周期信号的孔径抖动及其去除

孔径抖动是指模数转换器采样周期之间出现的相位抖动 ,是由各时钟周期边沿出现时刻的不确定性导致的。当输入信号频率较高时孔径抖动是模数转换器信噪比下降的一个重要原因。对数据采集系统中的孔径抖动进行了仿真实验 ,介绍了反卷积算法 ,并利用反卷积算法对周期信号的孔径抖动进行了去除。仿真结果表明该方法是有效可行的     

Radar Imaging Based on Iterative Algorithms

It has long been realized that the problem of radar imaging is a special case of image reconstruction in which the data are incomplete and noisy. In other fields, iterative reconstruction algorithms have been used successfully to improve the image quality. This paper studies the application of iterative algorithms in radar imaging. A discrete model is first derived, and the iterative algorithms are then adapted to radar imaging. Although such algorithms are usually time consuming, this paper shows that, if the algorithms are appropriately simplified, it is possible to realize them even in real time. The efficiency of iterative algorithms is shown through computer simulations.     

广义互补问题及其约束优化问题的转化形式

对于广义互补问题，本文给出了它的约束优化问题的两种转化形式，讨论了它们的KKT点为原问题的解的充分条件．     

Petri网络在无控制交叉口延误分析中的应用

选用比较适合描述系统组织结构和动态行为的Petri网络模型对主路优先通行的无信号交叉口运行过程建立HSPN模型．在此基础上，结合间隙接受理论，对无控制交叉口进行平均延误分析探索，为交叉口仿真控制软件的研发奠定了算法基础。     

Subset threshold autoregression

We develop in this paper an efficient way to select the best subset threshold autoregressive model. The proposed method uses a stochastic search idea. Differing from most conventional approaches, our method does not require us to fix the delay or the threshold parameters in advance. By adopting the Markov chain Monte Carlo techniques, we can identify the best subset model from a very large of number of possible models, and at the same time estimate the unknown parameters. A simulation experiment shows that the method is very effective. In its application to the US unemployment rate, the stochastic search method successfully selects lag one as the time delay and five best models from more than 4000 choices. Copyright © 2003 John Wiley & Sons, Ltd.     

陕西省产业结构的现状及其优化

分析陕西省产业结构的特点及其优化途径.认为陕西省产业结构的特点是第一产业总量缓步增长而比重下降,第二产业总量增长迅速,比重快速上升,而第三产业快速增长.陕西省产业结构趋向合理,但也存在着第二产业发展滞后,竞争力低下,缺乏集群效应和主导产业模糊等问题.产业结构的优化可通过技术创新改造传统产业,培育主导产业,发挥集群效应等途径实现.     

中国城镇居民食品结构与奶业发展

研究了中国城镇居民食品结构及营养平衡状况,分析了奶的生产优势及在食品结构中的重要作用。用数学模型计算出中国城镇居民较合理的食品结构。分析了当前奶业存在的问题及解决办法。表5,参4。     

一种利用绝对最小Lipshitz延拓的医学图像插值算法

提出一种基于最小Lipshitz延拓的图像插值半隐式算法,并用医学图像放大实验初步验证了算法的有效性.     

不同卫星遥感数据镶嵌最优方法探讨——以ASTER和TM影像为例

以贵州省黔南州ASTER和TM影像为数据源,运用IMAGINE ERDAS V9.1软件为主要支撑,介绍不同影像的几何校正和拼接的基本原理和方法,使数据处理和应用达到优化,为影像收集困难地区开展遥感调查及应用提供新途径。