Optimal design study of high order FIR digital filters based on neural network algorithm

An optimal design approach of high order FIR digital filter is developed based on the algorithm of neural networks with cosine basis function . The main idea is to minimize the sum of the square errors between the amplitude response of the desired FIR filter and that of the designed by training the weights of neural networks, then obtains the impulse response of FIR digital filter . The convergence theorem of the neural networks algorithm is presented and proved, and the optimal design method is introduced by designing four kinds of FIR digital filters , i.e., low-pass, high-pass, bandpass , and band-stop FIR digital filter. The results of the amplitude responses show that attenuation in stop-bands is more than 60 dB with no ripple and pulse existing in pass-bands, and cutoff frequency of passband and stop-band is easily controlled precisely .The presented optimal design approach of high order FIR digital filter is significantly effective.     

层次分析法中逆序问题与其决策环境的研究

本文研究了层次分析法中的逆序问题与其决策环境的关系,并对产生逆序现象的机理做了数学上的分析和定性的解释。文中还给出了多准则下排序的强保序定理。     

Y型冷轧带肋钢筋轧机孔型设计

本文根据连轧的基本原理研究了Ｙ型冷轧带肋钢筋轧机的基本孔型系统及孔型设计方法，经工业生产检验其产品完全达到ＧＢ１３７８８－９２［１］的技术标准     

Hilbert空间方法在半线性方程上的应用

运用Sobolev嵌入定律和Schauder不动点定理,在一个比文[2]更宽松的条件下,建立了Hilbert空间方法,并有效地解决了如下方程解的存在性Lu-C(u,0)u=f(u).其中L是线性自伴算子,C(u,0)是非线性的并满足与L的谱有关的一系列条件,同时突破了文[1]中非共振条件中两个常数p,q的限制及文[2]中类似的限制条件,从而推广了文[1,2]的结论.     

Robustness Proof on A United Watermarking Based on CRT Theorem

A new method of embedding and detecting a joint watermarking is proposed. It applies the asmuth-bloom secret sharing scheme, which is based on CRT (Chinese remainder theorem) theorem, to the digital watermarking technology. On the base of describing the watermarking embedding proceeding and analyzing the watermarking detection proceeding, a series of experiments is done. The experiments emphasize on the method‘s robust proving and security analysis. And the experiments show that the method can resist the attacks of JPEG compress, geometry, noise and gray adjusting. The results of the experiments show that the method has a nice recognition of copyright for joint ownership.     

贵港市山地利用现状及开发途径分析

贵港市位于北回归线以南，自然地理条件优越，交通便利．山地主要为林地，部分为荒地，经济林比重小，土地利用率和经济效益低．应该充分发挥本地优势，开发利用山地．用经济效益高的果林和经济林代替现有林地和荒地，使山地能持续稳定地发挥最佳经济效益．     

山区地表移动观测数据处理模型

提出山区地表移动观测数据处理的新途径。将主断面和主滑方向的观测数据视为整体进行分析，通过对观测站原始数据的处理，建立了山区滑移影响函数和任意地表点移动变形的一般模式，并提出山区地表移动参数的求取途径，为山区地表移动规律的深入研究提供一定的理论基础。     

2300 V潜油电泵专用变频器

在介绍潜油电泵的传统供电方式的多种弊病之后，阐述了变频供电方式的优越性，进而给出了2300 V 潜油电泵变频器几个特殊要求和解决办法。     

测定气轨的粘性阻尼常量的一种方法

利用功能原理，设计了测定气轨粘性阻尼常量的实验方法。     

状态空间时滞系统稳定性检验的二维方法

由于时滞系统的特征根有无限多个,所以检验时滞系统的稳定性是困难的.为解决这一问题,本文提出用二维方法检验时滞系统的稳定性.对给定时滞系统的特征多项式,根据时滞构造适当阶次的二维s＿z混合多项式,则该二维s＿z混合多项式的稳定性可确保该时滞系统为稳定的.本文提出二维Routh＿Schur检验用于二维s＿z混合多项式的稳定性的代数检验.应用举例说明了本文所提方法的可行性.