α－β滤波器的基本问题分析与仿真研究

针对α－β滤波器滤波增益随采样时刻的增加而减小的问题,提出了一种根据位置滤波平均误差、速率滤波平均误差以及速度滤波效果确定滤波增益下降截止时刻的方法,并分析了可能影响滤波增益下降截止时刻的因素。仿真结果表明：通过该方法确定的滤波增益下降截止时刻可以使α－β滤波器的滤波效果达到最佳;滤波增益下降截止时刻与目标采样间隔的相关性最强,与过程噪声的相关性次之,与量测噪声的相关性最弱。     

有效市场假说与分形市场假说

本文通过对EMH和近几年兴起的FMH理论的比较,指出金融市场是符合FMH理论所说的尖峰肥尾及长期记忆性,并是宽意义下的自相似过程。     

比特串中值滤波

本文根据信号的分解性,对传统的多电平中值滤波(MF),提出了一种新的比特串中值滤波概念.其主要工作包括:(1)导出了比特串中值滤波的定义;(2)讨论了它的基本特性:(3)给出了它的实时信号处理电路结构和实验结果.     

常用图像去噪滤波方法比较分析

图像在成像、传输、转换或存储的过程中会受到各种随机干扰信号即噪声的影响,从而会使画面变得粗糙、质量下降、特征淹没。为了减弱噪声、还原真实的画面,就需要用到降噪滤波器对图像数据进行处理。选取了图像降噪最具有代表性的滤波方法即均值滤波、中值滤波和维纳滤波对同时加有高斯噪声、椒盐噪声和乘性噪声的图像进行了滤波处理,并由各种滤波的原理,再结合各种方法处理的效果和详细分析比较了各种滤波在图像去噪方面的特征、以及各自作用的利弊。     

电源电子滤波电阻作用的定量分析

通过定量分析分析电源电子滤波电阻的作用，得到了该电阻应选定在最佳值上才能获得最好综合滤波效果的结论，从而为电源电子滤波电路的设计等提供了又一指导依据。     

我国股票市场非线性结构研究

本文从沪深股市的随机游走检验入手,研究我国股票市场的非线性特性,先后采用AR线性滤波和GARCH族滤波,应用BDS检验来区别我国股市的非线性特征,结合最大李雅普诺夫指数以及沪深指数的HURST指数,研究表明我国股票市场存在着混沌特性。     

随机抽样一致性算法在Vondrak滤波中的应用

针对传统Vondrak滤波法易受粗差值影响的问题,提出了一种基于随机抽样一致性的Vondrak滤波算法来探测和剔除数据中的粗差。首先通过采用随机抽样一致性算法对需要滤波的观测数据进行预处理;然后对数据是否在阈值范围内进行判断,给相应的数据赋予不同的权值系数;最后利用Vondrak滤波估计预处理后的数据。为了验证所提滤波算法的有效性,通过计算机仿真的方法,采用两种不同的信号模型产生信号,并且在两种信号中都加入粗差,分别利用传统的Vondrak滤波、抗差Vondrak滤波和所提滤波算法对两种信号进行滤波。仿真结果表明,所提滤波算法具有良好的粗差探测能力。     

基于UKF滤波器的状态融合算法

对于具有相同观测方程、不相关观测噪声的非线性系统,应用非线性系统的无迹卡尔曼滤波器和加权最小二乘法,提出了信息融合UKF滤波算法。同但传感器情形相比,提高了滤波精度。     

一种基于Stein无偏风险估计的复合去噪算法

针对统计非局部均值滤波损坏图像的细节与鲁棒性双边带滤波去噪不充分的缺点,提出了一种基于统计非局部均值滤波与鲁棒性双边带滤波相结合的复合滤波算法。该复合滤波算法通过统计非局部均值滤波与鲁棒性双边带滤波线性组合,利用Stein无偏风险估计对复合算法中的参数进行估计。实验中,从主观与客观方面进行对比分析,证明所提出的复合算法体现了非局部均值滤波与双边带滤波的优点,能有效地去除噪声并更好地保留图像的细节信息,峰值信噪比提高1～2 dB。     

高斯模板均值化在图像滤波中的应用

在信号处理的问题中,常常因为噪声或者其他后续处理需要对信号进行滤波操作.图像滤波主要的方法是通过对图像的卷积操作进行,而常见的卷积操作所使用的模板为高斯卷积模板,但对于模板尺度过大的情况,高斯卷积模板的滤波速度是很低的.本文通过对大尺度高斯卷积模板的特性,研究其模板权值在数值上的均值特点,将大尺度的高新卷积模板均值化运用于图像的滤波操作上,减少了运算的复杂性以及提高了运算的速度,并通过比较两种滤波方法的方差,验证了高斯模板均值化在图像滤波操作中的可行性.     

Export Growth Slows Down

In November of 2005, China and the U.S. signed a bilateral agreement on textiles, launching the three-year quota control for 21 sorts of textile products. In 2007, the second year for the implementation of the agreement, China＇s textile export to the U.S. underwent several changes.     

Two Contrasting Phenomena in Textile Exports

As the two traditional markets for China＇s tex- tile and clothing exports, the U.S. and Europe have recently shown a huge contrast.     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

The 6th China-ASEAN Business Council Meeting Held

On February 29th.the 6th China.ASEAN Business Council meeting was held in Beijing.Some 50 deputies attended the meeting,including top officialsCCPITVPYuPing andthe president of the ASEAN Chamber of Commerce and Industry,as well as business and industrial representatives from Thailand,Myanmar,the Philippines and Singapore.Also present at the meeting were representatives from the Secretariat in China of the China-ASEAN Business Council,the Guangxi Branch of the CCPIT,as well as industrial branches and media.     

Beijing Development Zones

Beijing Badaling Development Area The Development Area is planned to cover an area of 6.56 km~2. Currently,more than 300 enterprises have located in the area. Their investments add up to about RMB 1 billion.Major busi- ness trades include machine building,mineral ore processing,medicine, electronic parts,foodstuffprocessing,and warehousing transportation. The Development Area has completed the construction of neces- sary infrastructural facilities.     

Evaluating China's Exchange Rate Regime

The U.S.in the last couple of years has been up in arms about China's exchange rate regime. In 1994 China established a de facto currency peg.The dollar-RMB ex- change rate was fixed at 8.28.The People's Bank of China(PBC)al- lowed the rate a narrow band of around .01 to.02 percent in which it could shift daily.The exchange rate program did not become newsworthy until U.S.Treasury Secretary John Snow's visit in 2003.In fact as a study by Frankel and Wei(2007) showed,the RMB's forward was actually selling at a discount against the dollar prior to Secretary Snow's visit to China     

Sino-America Dialogue Brings Long-term Cooperation

Dialogue between China and U.S. is various in channels, among which Sino-U.S. Strategir,Economic Dialogue paves way for a smoothly-going and long-term cooperation in bilateral relations.The dialogue focuses on bilateral and global strategic economic issues of common interests and concerns.     

Auto Parts Market Potential Coming into Surface

Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship,     

China''''s Stock Market Wave

The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy.     

Awarding Ceremony and New Arrivals of Blissliving

The long expected Lan - Blisslivinghome Global Home Design Contest announced the winners on April 17 in Beijing. Young designers, Wang Yingying from Beijing and Qiang Xiaoning from Shanxi stood out from the crowd and won the first and second prize respectively, Malgorzata Czuchraj from Poland ranks the third, On the awarding ceremony, Blisslivinghome presented its autumn and winter new arrivals,