共查询到20条相似文献,搜索用时 31 毫秒
1.
The unconditional stability for the hyperneutral type constant linear control system with delays (I) 总被引:1,自引:0,他引:1
By means of the frequency domain method and the inequality analysis, we discuss the unconditional stability problem for the
hyperneutral type constant linear control system with delays, and obtain some precise sufficient, sufficient and necessary
conditions.
Foundation item: Supported by the Natural Science Foundation of Hubei Province (2000A49005)
Biography: Li Ye-ping (1972-), male, Lecturer, research direction: partial differential equation and differenfial dynamic
systems. 相似文献
2.
The number of the limit cycles bifurcating in small quadratic perturbations of quadratic systems with an ischronous center
is studied, it turns out that the cyclicity of the period annulus around one kind of quadratic isochronous center is two.
Foundation item: Supported by the National Natural Science Foundation of China(No. 19531070) and Natural Science Fundation
of Hubei Province(No. 98J121)
Biography: Chen Shi-hua(1961-), male, Associate professor, research interests: qualitative of ordinary differential equation
and chaos control. 相似文献
3.
We introduce a new parallel evolutionary algorithm in modeling dynamic systems by nonlinear higher-order ordinary differential
equations (NHODEs). The NHODEs models are much more universal than the traditional linear models. In order to accelerate the
modeling process, we propose and realize a parallel evolutionary algorithm using distributed CORBA object on the heterogeneous
networking. Some numerical experiments show that the new algorithm is feasible and efficient.
Foundation item: Supported by the National Natural Science Foundation of China (No. 70071042 and No. 60073043)
Biography: Kang Zhuo (1970-), male, Lecturer, research interest: network computing and evolutionary computation. 相似文献
4.
First, an asynchronous distributed parallel evolutionary modeling algorithm (PEMA) for building the model of system of ordinary
differential equations for dynamical systems is proposed in this paper. Then a series of parallel experiments have been conducted
to systematically test the influence of some important parallel control parameters on the performance of the algorithm. A
lot of experimental results are obtained and we make some analysis and explanations to them.
Foundation item: Supported by the National Natural Science Foundation of China (60133010, 70071042, 60073043)
Biography: Cao Hong-qing ( 1972-), female, Associate professor, research direction; evolutionary computing, parallel computing. 相似文献
5.
This paper investigates the competition diffusion model with delay. The existence and stability of nontrivial steady state
are studied.
Foundation item: Supported by the National Natural Science Foundation of China
Biography: ZHOU Li (1939-), male, Professor, research interest is in partial differential equation. 相似文献
6.
The approximation solvability of the abstract differential inclusion du/dt∈f(t,u) is presented. The convergence of the approximation solution and the existence of the solution for abstract evolution multivalued
problem are discussed.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19771062)
Biography: Xia Jin-sheng (1975-), Ph.D candidate, research interest: the approximate solution of differential equation. 相似文献
7.
V. I. Arnold defined some particular classes of index for singularities of adapted fields. We generalize these index classes
for general fields on manifolds with boundary and get some relations of these index classes.
Foundation item: Supported by the National Natural Science Foundation of China (10261002)
Biography: Xu Xu (1973-), male, Ph. D, research direction: singularities and differential topology. 相似文献
8.
We study the exact formal solution to the simplified Keller-Segel system modelling chemotaxis. The method we use is series
expanding. The main result is to attain the formal solution to the simplified Keller-Segel system.
Foundation item: Supported by the National Natural Science Foundation of China(No. 10025107)
Biography: Chen Hua(1956-), male, Professor, research direction: partial differential equations. 相似文献
9.
The unconditional stability for the multigroup multidelays neutral type linear constant control system 总被引:1,自引:0,他引:1
Li Ye-ping 《武汉大学学报:自然科学英文版》1999,4(4):382-386
Applying the frequency domain method and the inequality method, we discussed the unconditional stability problem of the multigroup
multidelays neutral type linear constant continuous control system, and obtained some sufficient conditions.
Foundation item: Supported by the National Natural Science Foundation of Hubei Province Education Committee
Biography: LI Ye-ping (1972-), male, Master candidate, research interest is in partial differential equation. 相似文献
10.
On the monotone iterative method for set valued equation 总被引:2,自引:0,他引:2
This paper deals with the monotone iterative method for set-valued operator equation in ordered normed space. Some results
for the case of single valued operator are generalized here, as an application, a discontinuous nonlinear differential equation
problem is discussed.
Foundation item: Supported by the Naional Natural Sciences Foundation of China
Biography: TIAN Yan (1970-), male, Ph.D. candidate, research interests are in numerical analysis for PDE 相似文献
11.
A subdynamics theory framework for describing multi-coupled quantum computing systems is presented first. A general kinetic
equation for the reduced system is given then, enabling a sufficient condition to be formulated for constructing a pure coherent
quantum computing system. This reveals that using multi-coupled systems to perform quantum computing in Rigged Liouville Space
opens the door to controlling or eliminating the intrinsic de-coherence of quantum computing systems.
Foundation item: Supported by the National Natural Science Foundation of China (79970121)
Biography: Liu Gui-Ping (1964-), male, Lecturer. Research direction: quantum networks. 相似文献
12.
YUANYin-quan SUNZhi-bo XIEYun ZOUXian-wu 《武汉大学学报:自然科学英文版》2004,9(6):895-898
The distribution and configuration of surfactants at interface in surfactant-water-oil systems have been investigated using discontinuous molecular dynamic simulations. There exists a certain equilibrium concentration of surfactants at interface for the systems with certain interactions among surfactant, water and oil. The interface length and equilibrium morphology of the systems are dependent on the equilibrium concentration of surfactants at interface and the total amount of surfactants. The interaction strengths among surfactant, water and oil determine the equilibrium concentration of surfactants at interface. Three typical configurations of surfactants at interface have been observed: ① surfactant molecules are perpendicular to the interface and arranged closely; ② perpendicular to the interface and arranged at interval of two particles; ③ lie down in the interface partly. 相似文献
13.
YANG Xiaohui DU Ruizhong TIAN Junfeng 《武汉大学学报:自然科学英文版》2006,11(6):1919-1922
Current distributed parallel file systems and database systems can not satisfy the demands of data-intensive applications, such as storage capacity, access performance, reliability, scalability, and so on. Cluster-based storage sys tems have some shortcomings, too. To solve this kind of problems, a novel PC storage cluster solution is proposed, a distributed storage system based on 3-tiered agent architecture is designed, the system reliability model based on the masterslave backup mode is built, and the system availability is analyzed with the Markov model. According to the system availability formula and the values of the system parameters, the novel system can provide higher reliability and availability to satisfy users' requirements, 相似文献
14.
The aim of research on software architecture is to improve the quality attributes of software systems, such as security, reliability,
maintainability, testability, reassembility, evolvability. However, a single running system is hard to achieve all these goals.
In this paper, software-cell is introduced as the basic unit throughout developing process. Then it is further advanced that
a robust, safe and high-quality software system is composed of a running system and four supportive systems. This paper especially
discusses the structure of software-cell, the construction of the five systems, and the relations between them.
Foundation item: Supported by the National Natural Science Foundation of China (No. 70073022)
Biography: Tang Sheng-qun(1946-), male, Professor, research interest: software engineering, architecture 相似文献
15.
Zhou Pei-jiang Ling Xing-yuan Zhou Han-tao Zhang Duang-yang Zhu Ying-guo Qu Song-sheng 《武汉大学学报:自然科学英文版》1999,4(4):498-502
The differential scanning calorimetric (DSC) curves of the mitochondria isolated from two varieties of sporophyte cytoplasmic
male sterile and their fertile lines of Yie Bai and Ma Xie type rice have been determined. The curves show that the energy
is released continuously as temperature rise to 70°C. Some thermodynamic and kinetic parameters of the energy release of the
mitochondria have been obtained. The presented results showed that the mitochondria from cytoplasmic male sterile rice released
more heat and they had higher energy barrier, less rate, and more complicated mechanism than that of their fertile lines in
the energy release process.
Foundation item: Supported by the National Natural Science Foundation of China, the China Postdoctoral Science Foundation
Biography: Zhou Pei-jiang (1956-), male, PhD, Associate professor. Current resarch interest is in biophysical chemistry and
environmental ecological chemistry 相似文献
16.
This paper analyzes a class of first order partial differential equations with delay (a model for the blood production system).
The asymptotic behavior of solutions are studied.
Supported by the National Natural Science Foundation of China
Fu Yiping: born in 1962, Dr. Candidate 相似文献
17.
The unified chaotic system contains the Lorenz system and the Chen system as two dual systems at the two extremes of its parameter
spectrum. This paper presents the design of bang bang controller for unified system and multitude of numerical experiments
under various control parameters. Numerical experiments meet the theoretic proof perfectly and convincingly demonstrated the
controller can be effectively used for unified systems with uncertainty of the equilibrium points. The method enriches the
applications of chaotic control.
Foundation item: Supported by the National Natural Science Foundation of China(50209012)
Biography: Deng Xiao-ming (1980-), male, Master candidate, research direction: chaos control. 相似文献
18.
We discuss the equivalence problem of hyperneutral type nonlinear time varying control system and linear time varying control
system in the theory of stabilization. Making use of the symmetric positive definite solution of Riccati matrix differential
equation which corresponds to the linear time varying control system, we construct the Lyapunov function. Then we provide
the sufficent conditions which make that the zero solution of the hyperneutral type nonlinear time varying control systems
is uniformly asymptotically stable by means of the Lyapunov equivalence decomposition method, and find the formulaes which
can be used to estimate the bounds of the time delays and the nonlinear terms.
Mong Peiyuan: born in 1950, Associate professor
Supported by the Natural Science Foundation of Hubei Province Education Committee. Project code: 97A080 相似文献
19.
When acquaintances of a model are little or the model is too complicate to build by using traditional time series methods,
it is convenient for us to take advantage of genetic programming (GP) to build the model. Considering the complexity of nonlinear
dynamic systems, this paper proposes modeling dynamic systems by using the nonlinear difference equation based on GP technique.
First it gives the method, criteria and evaluation of modeling. Then it describes the modeling algorithm using GP. Finally
two typical examples of time series are used to perform the numerical experiments. The result shows that this algorithm can
successfully establish the difference equation model of dynamic systems and its predictive result is also satisfactory.
Foundation item: Supported by Foundation for University Key Teacher by the Ministry of Education of China
Biography: Liu Min ( 1978-), female, Master candidate, research derection: application mathematics. 相似文献
20.
In order to get over the difficulty of introducing boundary conditions in solving differential equations by Daubechies wavelet,
in this paper the wavelet-Galerkin numerical method is suggested to solve the differential equations, especially for the differential
equation with boundary layer. The numberical results show that the algorithm described in this paper is effective both in
the precision and the ability of detecting boundary layer position.
Supported by the National Natural Science Foundation of China
Sun Jianhua: born in 1970, Ph. D. 相似文献