小波包理论和最优小波包基探讨

小波包理论是一般小波理论的扩展,在实际应用中小波包变换比小波变换应用更广,应用效果也比较好,给出了小波包理论和常用的小波包变换,探讨了每个小波包是否存在一个最优小波包基。     

合作学习模式培养阅读兴趣促进非英语专业大学生应对新四级

在英语教师贯彻执行《大学英语课程要求》的前提下,结合2005年推行的大学英语四级改革办法。阐述如何改变教学方法,转变教学观念,改变教学思路,并通过实践和研究,探索应对快速阅读及仔细阅读的技能和技巧,摸索出促进我校学生快速适应新四级考试的教学方法。     

公共服务型政府的打造与体育休闲政策的导向

公共服务型政府是建立在对传统政府模式全面革新的基础上,以为公民和社会提供公共服务为出发点的有限政府、法治政府、透明政府和有效政府Effective Government。体育休闲的兴起除了经济发展的内在动力以外,服务型政府宏观政策的推动起到了关键性的作用。服务型政府在体育休闲管理上的价值取向,一是公共性,二是服务性。     

Coherence estimate between a random and a periodic signal: Bias, variance, analytical critical values, and normalizing transforms

The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals.     

创新能力、技术转化与创新绩效──来自我国电子信息业上市公司的实证

利用随机前沿方法对我国电子信息业的技术创新绩效进行分析.实证结果表明:资本及人力投入是行业创新绩效提升的主导,表明电子信息业仍处于对资本及人力依赖的粗放型经济运行状态;科技人员对电子信息业创新绩效提升的贡献还很有限;专利技术拥有量对创新绩效提升具有重要意义;东部地区的创新绩效明显优于中、西部地区,但西部地区近年来创新绩效上升的趋势明显.     

调和NA群上几种新的Hardy不确定原理

介绍了调和NA群上的Radon变换,以及这个变换和Helgason-Fourier变换之间的关系。基于这些变换,将实直线R上Morgan形式的Hardy不确定原理和Cowling-Price形式的Hardy不确定原理推广到调和NA群。     

非线性相位函数的Hilbert变换的注记

研究了一类非线性相位的单位解析信号,采用实方法给出了这类信号的一般刻画。最后,将这种情形归结为Mobius变换的一个特例。     

A new semi-fragile watermarking algorithm for image authentication

1 Introduction1 With the rapid development of Internet, digital multimedia can be easily shared via computer networks and conveniently processed for queries in databases. At the same time, the powerful multimedia manipulation software has made it possible to edit and alter the media’s content seamlessly, which breeds the demand of a secure authentication system to verify authentication. Digital watermarking has been proposed as a possible solution for data and tamper detection. An authentica…     

锅炉房节能改造

北京财贸学校对燃气锅炉房供暖系统进行了节能改造。改造后节能效果明显,值得全面推广。     

小波变换及其应用研究

小波变换是当前应用数学和工程学科中一个迅速发展的新领域。文中首先介绍了小波变换的基本概念,进而对其在各个领域的应用进行了讨论,最后对其发展前景进行了展望。