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

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 univer.ity of technology, lanzhou 730050, china 2 Department of Physics, Central china Normal univer.ity, Wuhan 430079, china 3 college of electrical and information engineering, lanzhou univer.ity of technology, lanzhou 730050, china 1. Department of Physics Lanzhou University of Technology Lanzhou 730050 China2. Department of Physics Central China Normal University Wuhan 430079 China3. College of Electrical and Information Engineering Lanzhou University of Technology Lanzhou 730050 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

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D(β)-vertex-distinguishing total coloring of graphs

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Science china Mathematics 2006年第10期49卷 1430-1440页

作者： ZHANG Zhongfu,LI Jingwen,CHEN Xiang’en,YAO Bing, WANG Wenjie & QIU Pengxiang Institute of Applied Mathematic, lanzhou Jiaotong univer.ity, lanzhou 730070, china college of Mathematics and information Science, Northwest Normal univer.ity, lanzhou 730070, china college of information and electrical engineering, lanzhou Jiaotong univer.ity, lanzhou 730070, china Institute of Applied Mathematic Lanzhou Jiaotong University Lanzhou 730070 China college of Mathematics information Science Northwest Normal University Lanzhou 730070 China college of information electrical engineering Lanzhou Jiaotong University Lanzhou 730070 China

A new concept of the D(β)-vertex-distinguishing total coloring of graphs, i.e., the proper total coloring such that any two vertices whose distance is not larger than β have different color sets, where the color set of a vertex is the set composed of all colors of the vertex and the edges incident to it, is proposed in this paper. The D(2)-vertex-distinguishing total colorings of some special graphs are discussed, meanwhile, a conjecture and an open problem are presented.

关键词： graph, total coloring, D(β)-vertex-distinguishing total coloring, D(β)-vertexdistinguishing total chromatic number.

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On adjacent-vertex-distinguishing total coloring of graphs

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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 univer.ity, lanzhou 730070, china Department of Computer, lanzhou Normal college, lanzhou 730070, china Institute of Applied Mathematics, lanzhou Jiaotong univer.ity, lanzhou 730070, china college of information and electrical engineering, lanzhou Jiaotong univer.ity, lanzhou 730070, china Institute of Applied Mathematics, Chinese Academy of Sciences, Beijing 100080, china 1. college of Mathematics and information Science Northwest Normal University 730070 Lanzhou China 2. Department of Computer Lanzhou Normal College 730070 Lanzhou China 3. Institute of Applied Mathematics Lanzhou Jiaotong University 730070 Lanzhou China 4. college of information and electrical engineering Lanzhou Jiaotong University 730070 Lanzhou China 5. Institute of Applied Mathematics Chinese Academy of Sciences 100080 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.

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钢中脆硬粒子裂纹形成机理

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物理学报 2004年第2期53卷 571-576页

作者：朱亮张爱华甘肃工业大学甘肃省有色金属新材料省部共建国家重点实验室兰州730050 甘肃工业大学电气工程与信息工程学院兰州730050

钢中的脆硬粒子对钢的解理脆断有直接的影响 ,解理断裂源大都发生在脆硬粒子上 .根据微裂纹形成的热力学模型 ,利用钢中脆硬粒子开裂时所释放的弹性应变能、位错塞积弹性能 ,所产生的表面能 ,对脆硬粒子裂纹形成机理进行分析 .模型计算... 详细信息

钢中的脆硬粒子对钢的解理脆断有直接的影响 ,解理断裂源大都发生在脆硬粒子上 .根据微裂纹形成的热力学模型 ,利用钢中脆硬粒子开裂时所释放的弹性应变能、位错塞积弹性能 ,所产生的表面能 ,对脆硬粒子裂纹形成机理进行分析 .模型计算表明 ,正应力和位错塞积力都是脆硬粒子开裂的必要条件 ,这与实验事实相符 ;同时给出脆硬粒子开裂的临界条件计算方法 ,计算发现 ,脆硬粒子临界开裂应力不仅取决于脆硬粒子尺寸及表面能 ,而且与晶粒直径有一定的相关关系 ,当晶粒直径较小时 ,这种关系与实验测定的材料解理断裂应力与晶粒尺寸的关系一致 ,说明整体失稳解理断裂的控制环节为脆硬粒子开裂 ;当晶粒直径较大时 ,脆硬粒子临界开裂应力就小于材料解理断裂应力。

关键词：钢脆硬粒子解理断裂裂纹形核弹性应变能位错塞积弹性能正应力位错塞积力临界开裂应力

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

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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 univer.ity, Changsha 410082, P. R. china college of electrical and information engineering, Changsha univer.ity 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.

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Tank Farm Operation Optimization System of Refinery

Tank Farm Operation Optimization System of Refinery

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2010 Chinese Control and Decision Conference

作者： Xiaoqiang Zhao,Weirong Liu college of electrical engineering and information engineering,lanzhou univer.ity of technology,lanzhou 730050

＜正＞According to operation bottlenecks of tank farm,this paper discusses statistical risk simulator program that models the tank farm operation of refinery and covers a ship delay,lifting schedules,unit stream factor,maintenance activities,movement automation,movement planning and scheduling,and adequate field equipment such as tank gauges, flowmeters,and remote control,*** optimization system can create tremendous benefits for refineries.

关键词： Tank Farm Optimization Database

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Approximately optimal tracking control for discrete time-delay systems with disturbances

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Progress in Natural Science:Materials International 2008年第2期18卷 225-231页

作者： Gongyou Tang a,,Huiying Sun b,Haiping Pang c a college of information Science and engineering,Ocean univer.ity of china,Qingdao 266100,china b college of information and electrical engineering,Shandong univer.ity of Science and technology,Qingdao 266510,china c college of Automation and Electronic engineering,Qingdao univer.ity of Science and technology,Qingdao 266042,china college of information Science and engineering Ocean University of China Qingdao 266100 China college of information and electrical engineering Shandong University of Science and Technology Qingdao 266510 China college of Automation and Electronic engineering Qingdao University of Science and Technology Qingdao 266042 China

Optimal tracking control (OTC) for discrete time-delay systems affected by persistent disturbances with quadratic performance index is considered. By introducing a sensitivity parameter,the original OTC problem is transformed into a series of two-point boundary value (TPBV) problems without time-advance or time-delay terms. The obtained OTC law consists of analytic feedforward and feedback terms and a compensation term which is the sum of an infinite series of adjoint vectors. The analytic feedforward and feedback terms can be found by solving a Riccati matrix equation and two Stein matrix equations. The compensation term can be obtained by using an iteration formula of the adjoint vectors. Observers are constructed to make the approximate OTC law physically realizable. A simulation example shows that the approximate approach is effective in tracking the reference input and robust with respect to exogenous persistent disturbances.

关键词： Discrete systems Time-delay systems Disturbances Optimal control Tracking control

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Characteristics and origins of primary fluids and noble gases in mantle-derived minerals from the Yishu area,Shandong Province,china

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Science china Earth Sciences 2006年第1期49卷 77-87页

作者： MA Jinlong1,2, TAO Mingxin2,3 & YE Xianren2 1. Resources and Environmental School, lanzhou univer.ity, lanzhou 730000, china 2. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, lanzhou 730000, china 3. college of Resources Science & technology, Beijing Normal univer.ity, Beijing 100875, china 1. Resources and Environmental School Lanzhou University Lanzhou 730000 China 2. Key Laboratory of Gas Geochemistry Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China 3. college of Resources Science & technology Beijing Normal University Beijing 100875 China

Fluids and noble gases of mantle-derived materials are important tracers forthe mantle information. Compositions of primary fluids and noble gases in mantle-derived mineralsfrom the Yishu area, Shandong Province, china, were tested by the methods of heat-bursting andheat-melting respectively. The fluids are mainly composed of CO_2, CO and H_2, which account forabout 90% of the total, and are similar to the mantle-derived rocks from other areas of easternchina; ratios of ~3He/~4He in almost all samples range from 0.82 Ra to 2.74 Ra, whereas^(40)Ar/^(36)Ar from 299.5 to 758.8. Both ranges are much lower than those of the typical oceanmantle-derived samples (such as MORB) and primarily reflect the influences of the atmosphericcomponents and the radiogenic isotopes. Ratios of C/~3He range from 27.6 x 10~9 to 1050 x 10~9,N_2/Ar from 927 to 56612, and N_2/~3He from 2.5 x 10~9 to 27 x 10~9, similar to those in westernUnited States and New Zealand which belong to the tectonic plate collision regions. The ratios fallin the intersect of mantle-crust-atmosphere in the comprehensive tracer-charts, reflecting theinfluences of the atmosphere and the crusts with organic components. Our results suggest that thecomposition of the primary fluids and the isotopic ratios of the noble gases may either reflect theevolution process of mantle-derived rocks connected with the rise and eruption of magma, or theinfluence of the ancient subduction-plate on the continental mantle of this region.

关键词： noble gases, primary fluids, mantle-derived minerals, Yishu area.

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不确定网络化控制系统的保性能鲁棒容错控制

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系统仿真学报 2009年第23期21卷 7544-7548页

作者：李炜李亚洁兰州理工大学电气工程与信息工程学院兰州730050

研究了一类含有不确定性的网络化控制系统的完整性和保性能容错控制问题。基于Lyapunov稳定性理论和LMI方法,采用状态反馈控制策略,针对含有不确定性的网络化控制系统当执行器发生失效故障时分别推证出了系统仍渐近稳定和能够满足一定... 详细信息

研究了一类含有不确定性的网络化控制系统的完整性和保性能容错控制问题。基于Lyapunov稳定性理论和LMI方法,采用状态反馈控制策略,针对含有不确定性的网络化控制系统当执行器发生失效故障时分别推证出了系统仍渐近稳定和能够满足一定控制指标的充分条件,进而通过将矩阵不等式转化为线性矩阵不等式得到了求取两种容错控制器的方法。最后用仿真算例验证了该方法的有效性和可行性。

关键词：网络化控制系统鲁棒容错控制保性能控制线性矩阵不等式

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Power Quality Disturbance Signals Identification Based On Wavelet Packet and SVM

Power Quality Disturbance Signals Identification Based On Wa...

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2011 Chinese Control and Decision Conference（CCDC）

作者： Li Yan-nan is with the college of electrical and information engineering,lanzhou univer.ity of technology,lanzhou,730050,china and Key Laboratory of Gansu Advanced Control for Industrial Processes,lanzhou,730050,china Bao guang-qing is with the college of electrical and information engineering,lanzhou univer.ity of technology,lanzhou,730050,china and Key Laboratory of Gansu Advanced Control for Industrial Processes,lanzhou,730050,china.

Identification and classification of fault signal in power systems is an important *** the pattern recognition of disturbance signal,this paper presents five benchmarks of disturbance signal by MATLAB;Then,feature vectors of the disturbance signal which are extracted by the wavelet packet transforms;The vectors can be recognize by SVM *** results show this approach achieved a classification accuracy of 97%,a few training samples and training time is short,a good real-time *** is an effective method for identify power disturbance signals.

关键词： Power system disturbance signals Wavelet packet transforms Support Vector Machine (SVM)

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