检索结果-南通市图书馆

On adjacent-vertex-distinguishing total coloring of graphs

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2005年第3期48卷 289-299页

作者： ZHANG Zhongfu, CHEN Xiang’en, LI Jingwen, YAO Bing, LU Xinzhong & WANG Jianfang college of Mathematics and information Science, Northwest Normal university, lanzhou 730070, china Department of Computer, lanzhou Normal college, lanzhou 730070, china Institute of Applied Mathematics, lanzhou jiaotong university, lanzhou 730070, china college of information and electrical engineering, lanzhou jiaotong university, lanzhou 730070, china Institute of Applied Mathematics, Chinese Academy of Sciences, Beijing 100080, china college of Mathematics and information Science Northwest Normal University Lanzhou China Department of Computer Lanzhou Normal College Lanzhou China Institute of Applied Mathematics Lanzhou Jiaotong University Lanzhou China college of information and electrical engineering Lanzhou Jiaotong University Lanzhou China Institute of Applied Mathematics Chinese Academy of Sciences Beijing China

In this paper, we present a new concept of the adjacent-vertex-distinguishing total coloring of graphs (briefly, AVDTC of graphs) and, meanwhile, have obtained the adjacent-vertex-distinguishing total chromatic number... 详细信息

关键词： graph, proper total coloring, adjacent-vertex-distinguishing total coloring, adjacent-vertex-distinguishing total chromatic number.

在线全文

学校读者我要写书评

暂无评论

DSP技术在数字信号处理实验中的应用

西北民族大学学报（自然科学版） 2004年第3期25卷 49-51,88页

作者：武晓春兰州交通大学信息与电气工程学院甘肃兰州730070

结合高校"数字信号处理"课程的实验教学现状,讨论将DSP技术引入"数字信号处理"实验的必要性和可能性,介绍DSP芯片的结构及技术特性,分析DSP实验的硬件开发环境,并以"FFT频谱分析及应用"实验为例,探讨DSP技术在实验中的教学意义.

关键词：数字信号处理 DSP技术 DSP芯片开发板 FFT 实验

在线全文

学校读者我要写书评

暂无评论

主动式拥塞控制机制浅析

铁路计算机应用 2005年第1期14卷 42-44页

作者：石杰吴辰文兰州交通大学信息与电气工程学院兰州730070

分析了Internet上出现拥塞的基本原因,对比了已有的被动式路由器队列管理机制和新兴的主动式队列(AQM)管理方法的主要优缺点,叙述了AQM的指导算法“早期随机检测算法(RED)”,自适应控制在RED算法中的应用,提出了存在的问题和研究思路。

关键词：拥塞控制被动式队列管理主动式队列管理 RED 自适应控制

Robustness and breakup of the spiral wave in a two-dimensional lattice network of neurons

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第4期53卷 672-679页

作者： MA Jun 1,2, TANG Jun 2 , ZHANG AiHua 3 & JIA Ya 2 1 Department of Physics, lanzhou university of Technology, lanzhou 730050, china 2 Department of Physics, Central china Normal university, Wuhan 430079, china 3 college of electrical and information engineering, lanzhou university of Technology, lanzhou 730050, china Department of Physics Lanzhou University of Technology Lanzhou China Department of Physics Central China Normal University Wuhan China college of electrical and information engineering Lanzhou University of Technology Lanzhou China

The robustness and breakup of spiral wave in a two-dimensional lattice networks of neurons are investigated. The effect of small- world type connection is often simplified with local regular connection and the long-range connection with certain probability. The network effect on the development of spiral wave can be better described by local regular connection and changeable long-range connection probability than fixed long-range connection probability because the long-range probability could be changeable in realistic biological system. The effect from the changeable probability for long-range connection is simplified by multiplicative noise. At first, a stable rotating spiral wave is developed by using appropriate initial values, parameters and no-flux boundary conditions, and then the effect of networks is investigated. Extensive numerical studies show that spiral wave keeps its alive and robust when the intensity of multiplicative noise is below a certain threshold, otherwise, the breakup of spiral wave occurs. A statistical factor of synchronization in two-dimensional array is defined to study the phase transition of spiral wave by checking the membrane potentials of all neurons corresponding to the critical parameters(the intensity of noise or forcing current)in the curve for factor of synchronization. The Hindmarsh-Rose model is investigated, the Hodgkin-Huxley neuron model in the presence of the channel noise is also studied to check the model independence of our conclusions. And it is found that breakup of spiral wave is easier to be induced by the multiplicative noise in presence of channel noise.

关键词： spiral wave factor of synchronization breakup multiplicative noise robustness

在线全文

学校读者我要写书评

暂无评论

牵引变压器绕组变形在线检测方法研究

铁道学报 2004年第2期26卷 60-65页

作者：高仕斌王果西南交通大学电气工程学院四川成都610031

国内外的研究和统计表明,变压器绕组变形是电力系统安全运行的一大隐患,通过测量变压器绕组短路电抗来判断变压器绕组是否变形是一种有效的方法。本文提出了2种通过在线监测原、次边的电压和电流,实时计算绕组的短路电抗来判断变压器绕... 详细信息

国内外的研究和统计表明,变压器绕组变形是电力系统安全运行的一大隐患,通过测量变压器绕组短路电抗来判断变压器绕组是否变形是一种有效的方法。本文提出了2种通过在线监测原、次边的电压和电流,实时计算绕组的短路电抗来判断变压器绕组变形的方法,并对电气化铁路主要接线形式的牵引变压器绕组变形的在线监测方案进行了设计。论文分析了互感器误差对短路电抗测量结果的影响;通过变压器建模,分析了磁滞特性和负载变化大小对短路电抗测量结果的影响,验证了该方法在工程应用上的可行性。

关键词：变压器绕组变形短路电抗在线监测

在线全文

学校读者我要写书评

暂无评论

基于能量特征和神经网络的纹理图像分割

铁道学报 2004年第3期26卷 67-70页

作者：王喆王小鹏兰州交通大学信息与电气工程学院甘肃兰州730070

特征是描述纹理根本属性的一种有效手段,本文结合Gabor滤波器对不同频率和方向的选择特性及自组织特征映射神经网络对特征聚类的适应性和灵活性,提出了一种新的纹理图像分割方法。该方法首先通过Gabor滤波器提取纹理图像的能量特征,然... 详细信息

特征是描述纹理根本属性的一种有效手段,本文结合Gabor滤波器对不同频率和方向的选择特性及自组织特征映射神经网络对特征聚类的适应性和灵活性,提出了一种新的纹理图像分割方法。该方法首先通过Gabor滤波器提取纹理图像的能量特征,然后运用自组织特征映射神经网络进行特征聚类和分类,实现纹理图像的分割。仿真结果证明,该方法能有效地分割出区域特性不同的纹理,且错分率低于共生矩阵和K均值聚类相结合的分割方法。

关键词：纹理分割能量特征聚类自组织特征映射神经网络

同步电动机做步进运动状态时的MATLAB仿真

在线全文

学校读者我要写书评

暂无评论

铁道学报 2004年第6期26卷 62-66页

作者：胡彦奎陶彩霞兰州交通大学信息与电气工程学院甘肃兰州730070

根据电机统一理论与电机步进运动特点,利用电机的矩阵分析方法,建立了同步电机做步进运动时的数学模型。运用MATLAB语言中的Simulink仿真工具对动态过程进行仿真分析,仿真结果有助于系统最佳参数的选择。

关键词：同步电动机步进运动 MATLAB仿真

Design Principle and Variant Structure of a Controllable Reactor of Transformer Type

在线全文

学校读者我要写书评

暂无评论

Design Principle and Variant Structure of a Controllable Rea...

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

2005国际电机与系统学术会议

作者： Mingxing Tian Feng Zhao School of information & electrical engineering lanzhou jiaotong university lanzhou 730070 china

＜正＞ While designing a controllable reactor of transformer type （CRT）, the winding currents must be examined carefully because they determine the size and the temperature-rise of a CRT. In the paper, taking a CRT for example, the current of each winding of the CRT was calculated in every controlling step. Furthermore, by deriving and resolving the mathematic equations of a CRT, the general formulae for calculating the current of each winding were obtained. From the calculated results and the general formulae, the design principle of a CRT should be: （1） Weak Coupling-electromagnetic coupling among control windings must be very weak;（2） High Impedance-the short-circuited impedance between the work winding and each control winding must be high enough. According to the design principle, a variant structure of CRT was presented. The design principle and the variant structure of CRT presented here underpin the further analysis and design of a CRT

关键词： Reactive Power Compensation Controllable Reactor of Transformer Type Design Principle Variant Structure

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Systems engineering and Electronics 2004年第2期15卷 115-119,130页

作者： Wang Xiaohua & He Yigangcollege of electrical and information engineering, Hunan university, Changsha 410082, P. R. china college of electrical and information engineering, Changsha university of Science and Technology,Changsha 410077, P. R. china college of electrical and information engineering Hunan University Changsha 410082 P. R. China college of electrical and information engineering Changsha University of Science and Technology Changsha 410077 P. R. China

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.

关键词： high order FIR digital filters amplitude-frequency response neural network convergence theorem optimal design.