非线性左、右逆系统的规范形设计

此文对非线性最小阶左逆和最小阶右逆系统给出一种设计方法,其特点是仅用线性程序 (实数矩阵演算)和求反函数的程序即可获得由规范形描写的最小阶左、右逆系统的方程,从而 使设计过程中由非线性带来的复杂性降到了最低限度.     

Spark discharge and high-speed impact treatment of turbostratic CNx powder

CN_x precursor powders (composition: 33.76 at.% C, 49.53 at.% N and 16.71 at.% H) having a turbostratic structure were obtained by pyrolyzing melamine. Following spark discharge treatment, the precursor becomes more ordered in structure. The order was increased with increasing treatment time. Photoluminescence (PL) analysis confirmed that the spark discharge had only a slight effect on the energy band of the turbostratic CN_x powder, namely a blue shift of 11 nm in the emission spectrum of the precursor. By contrast, the high-speed impact treatment clearly promoted the mass transfer between the CN_x particles.     

一个无线双向认证和密钥协商协议

身份认证和密钥协商是无线通信中一个非常重要的安全问题.本文提出了一个无线双向认证和密钥协商协议,解决了无线通信中的身份认证和密钥协商问题,并使移动网络系统向移动用户提供匿名服务,使得访问网络与非法窃听者无法获知用户的身份信息,保证了用户身份信息和所在位置信息的机密性,高效实用.     

数据倒序匹配付里叶变换处理

本文讨论了改进二步匹配付里叶变换的信号分辨能力和目标信号检测能力的处理方法，文中进行了理论分析，并做了计算机仿真，结果表明：数据的正常次序和数据的倒序的二步匹配付里叶变换在目标信号分辨方面具有互补性，它们谱积具有较高的目标信号分辨力，在信噪比达-20dB的条件下，仍具有比较好的目标信号检测能力。     

The essential order of approximation for nearly exponential type neural networks

1 Introduction Artificial neural networks have been extensively applied in various fields of science and engineering. Why is so is mainly because the feedforward neural networks (FNNs) have the universal approximation capability[1-9]. A typical example of…     

A new FDTD scheme analysis for the characteristics of the magnetic‐anisotropic EBG structure

In this article, the new grid finite‐difference time‐domain (NG‐FDTD) method is applied to calculate the dispersion curves of electromagnetic band‐gap structures, and the dispersion characteristics of three magnetic‐anisotropic medium EBG structure are obtained using the NG‐FDTD method. According to these results, we can conclude that the EBG structure of a magnetic‐anisotropic medium, in which the permeability of nondiagonal elements is real, has a much larger band‐stop than that of isotropic EBG. Other magnetic‐anisotropic EBG structures can also increase the first band‐stop. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.     

On the linear complexity profile of nonlinear congruential pseudorandom number generators of higher orders

Nonlinear congruential methods are attractive alternatives to the classical linear congruential method for pseudorandom number generation. Generators of higher orders are of interest since they admit longer periods. We obtain lower bounds on the linear complexity profile of nonlinear pseudorandom number generators of higher orders. The results have applications in cryptography and in quasi-Monte Carlo methods.     

Determination of model order for NARX models directly from input-output data

Nonlinear auto-regressive models with exogenous inputs (NARX models) have proved to be versatile and useful empirical models for industrial processes. There are a wide variety of identification methods and model structures from which to choose; in all methods, however, key parameters are the model orders, which are the number of past outputs and inputs used in the model. In this paper the methods of Lipschitz numbers and false nearest neighbors are evaluated as a means of estimating the model orders of dynamic, discrete-time NARX models. No specific model structure is assumed and the model orders are estimated directly from input-output data using only geometric concerns and the continuity property. The two methods are applied to several dynamic systems, including realistic process simulations and experimental data from the UCSB pH neutralization process, and the consistency and accuracy of these methods are examined. The usefulness of these methods of model order determination for radial basis function network (RBFN) identification is examined.     

一种用于调制识别的盲码元定时估计算法

针对通信信号调制识别中的同步分类问题提出一种盲码元定时估计算法,对于调制方式未知的信号,可以估计未知信号的定时同步,得到最佳采样点信息,实现数字信号的同步分类。仿真结果表明本文的算法对于各种信号具有良好的同步效果。     

n-m≥2的高阶极值调节控制系统最优工作点预估研究

利用相关辨识法预估极值调节控制系统最化工作点的方法，推广到n-m≥2的高阶极值调节控制系统，使其应用范围更为广泛。