分布式电子商务服务供应链建立过程的原语描述

电子商务服务的分布式模型中,服务供应链的建立过程可使用多种算法,针对广度优先算法,该文设计了一套形式化的过程原语对其进行捕述,完整表达出整个服务供应链的建立过程。该文定义的过程原语适用于在同一个分布式模型中多个服务请求者同时对同一服务发起的服务供应链,最后用Petri网对具体模型中服务供应链的建立过程进行建模。     

一种用新的D CT算法的C P L D实现

研究了一种基于多项式变换PT法的高效DCT（Discrete Cosine Transfrom)算法,并对该算法进行CPLD（Complex Programmable Logic Device)设计。该设计中,提出了一种全新的硬件实现结构－－查找表（LUT）,该结构在乘法次数及资源利用率方面都比现行的其它算法具有更多的优越性能。     

多维DFT的多维多项式变换与离散W变换算法

本文首先通过引进一种序列的重排技术将m(m2) 维离散Fourier变换 (m-D DFT)转化为一系列的一维广义离散Fourier变换(GDFT)的多重和.然后引入一维离散W变换(DWT)以及多维多项式变换(MD-PT)计算该多重和以减少冗余的算术运算,从而得到了高效的多维DFT算法,该算法与常用的行-列DFT算法相比,乘法仅约为行-列法的1/2m,而加法仅约为行-列法的(2m+1)/4m.对于2维DFT的计算,本文方法同单纯的多项式变换方法相比,乘法与加法分别减少50%与40%左右.另外,本文算法计算结构简单,易于编程实现,通过数值实验验证了本文算法的高效性.     

Further Results on n-D Polynomial Matrix Factorizations

In this paper, some new results on zero prime factorization for a normal full rank n-D (n>2) polynomial matrix are presented. Assume that d is the greatest common divisor (g.c.d.) of the maximal order minors of a given n-D polynomial matrix F ₁. It is shown that if there exists a submatrix F of F ₁, such that the reduced minors of F have no common zeros, and the g.c.d. of the maximal order minors of F equals d, then F ₁ admits a zero right prime (ZRP) factorization if and only if F admits a ZRP factorization. A simple ZRP factorizability of a class of n-D polynomial matrices based on reduced minors is given. An advantage is that the ZRP factorizability can be tested before carrying out the actual matrix factorization. An example is illustrated.     

关于修正的并行Halley迭代法的收敛性证明

对有关文献所构造的求多项式全部重零点的并行Halley迭代法给出了另一收敛性定理,在此基础上,利用迭代加速技巧,获得了收敛阶至少为6的修正的并行迭代法,证明了收敛性定理。     

基于误差多项式的模型参考自适应控制在阀控非对称缸系统中的应用

基于误差方程多项式代数法的自适应控制设计理论,其基本思想是使自适应控制误差随时间的推移而趋向于零,它是确保所构成的自适应控制系统在李雅普诺夫意义下是稳定的。以对称阀控非对称缸液压伺服系统为研究对象,给出了适合应用于该系统的自适应控制算法,使系统的输出渐进一致地收敛于参考模型的理想输出,解决了对称滑阀控非对称液压缸系统存在的动态性能不对称,系统精度低,稳定性差,频宽窄和滞后大等问题。     

Improved design of FIR notch filter by using Bernstein polynomial

Bernstein polynomial has been used to design maximally flat FIR notch filters. However, the designed magnitude response is not exactly zero valued at notch frequency. In order to eliminate this undesired distortion, a novel method is presented to improve notch filter design in this paper. The designed notch filter is not only exactly zero valued at notch frequency but also has unity gain at ω=0 and π. Copyright © 2001 John Wiley & Sons, Ltd.     

修正梯形加速度运动规律中过渡曲线的设计

 To adapt to the high speed of modern rapier looms and the requirement of rapier motion curve,a new design method of transitional curve of modified trapezoid acceleration motion for rapier is put forward,which uses high order polynomial as transitional curve.The method takes into account not only boundary condition but also midpoint and 1/4 node,so the two joints of transitional curve are of slick transition.In this way,the rapier motions placidly and rapidly.It has more advantages and is fit for high speed looms.     

The multi-dimension RSA and its low exponent security

Using a well-known result of polynomial over the finite field , we show that the Euler-Fermat theorem holds in N[ x]. We present a multi-dimension RSA cryptosystem and point out that low exponent algorithm of attacking RSA is not suitable for the multi-dimension RSA. Therefore, it is believed that the security of the new cryptosystem is mainly based on the factorization of large integers.     

正形置换的刻划与计数

提出了正形置换多项式的概念,证明了正形置换多项式的几条性质,给出了正形置换一种刻划,证明了ＧＦ（２）＾ｍ上的所有正形置换的数目一定可以被２＾ｍ整除,并得到了这个数目的表示式,这些结果为正置换的研究提供了一种新的途径。