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Search Results: 1 - 10 of 62838 matches for " Hua XU "
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Fuzzy Timed Agent Based Petri Nets for Modeling Cooperative Multi-Robot Systems  [PDF]
Xingli HUANG, Hua XU, Peifa JIA
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.29096
Abstract: A cooperative multi-robot system (CMRS) modeling method called fuzzy timed agent based Petri nets (FTAPN) is proposed in this paper, which has been extended from fuzzy timed object-oriented Petri net (FTOPN). The proposed FTAPN can be used to model and illustrate both the structural and dynamic aspects of CMRS, which is a typical multi-agent system (MAS). At the same time, supervised learning is supported in FTAPN. As a special type of high-level object, agent is introduced into FTAPN, which is used as a common modeling object in its model. The proposed FTAPN can not only be used to model CMRS and represent system aging effect, but also be refined into the object-oriented implementation easily. At the same time, it can also be regarded as a conceptual and practical artificial intelligence (AI) tool for multi-agent systems (MAS) into the mainstream practice of the software development.
A review of research on the development of instruments for therapeutic efficacy evaluation of traditional Chinese medicine
Wei-hua Xu
Zhong Xi Yi Jie He Xue Bao , 2012,
Abstract: OBJECTIVE: Due to the differences between Chinese and Western cultures, Chinese version of foreign research instruments may not be totally applicable for use in evaluating the therapeutic effect of traditional Chinese medicine (TCM). Great efforts have been made by Chinese researchers to develop scales for evaluation of the therapeutic effects of TCM. This study aims to understand the current situation of research in the development of evaluation instrument in TCM.METHODS: Database searches of Chinese Biomedical Literature Database, China Academic Journal Network Publishing Database and Chinese Scientific Journals Database were undertaken to identify published studies with the purpose of developing instruments in assessing the effectiveness of TCM, including papers regarding the construction of conceptual framework of instrument, item generation and selection and the evaluation of measurement properties.RESULTS: A total of 60 pieces of literature involving 36 instruments were included. The first article on the development of each of the instruments was published between 2005 and 2011 and the instruments were used in many kinds of medical conditions, including cardiocerebrovascular, respiratory, digestive and infectious diseases. The number of items ranged from 10 to 52. Of the 36 instruments, 13 (36.1%) defined the hypothesized concepts measured by the instrument, 30 (83.3%) reported the domains of the questionnaires before measurement property testing and all of them were multidomain. Of 32 studies regarding item selection and the instrument’s property evaluation, 14 (43.8%) articles reported the administration mode, 24 (75%) reported response option types, and 10 (31.5%) provided scoring algorithm for the scale, but none of these 32 studies specified the recall period. In 29 studies aiming at testing instrument’s measurement property, 28 articles tested the Cronbach’s α coefficient of the full scale and/or subscales, and retest reliability was also detected in 15 studies. Twenty-seven studies evaluated the construct validity by exploratory factor analysis and among them there were two studies applying confirmatory factor analysis. Content validity, responsiveness and feasibility of instruments were assessed in 11, 16 and 16 studies, respectively.CONCLUSION: This study shows that in recent years many instruments have been developed in an attempt to evaluate the therapeutic effects of TCM, but some problems still exist in their practical implementation, including negligence in outlining the hypothesized concepts of the TCM instruments and in the reporti
Existence and Stability Periodic Solution for Prey-Predator System with Functional Response
XU Tian-hua
Journal of Chongqing Normal University , 2010,
Abstract: The existence and stability of periodic solution in Prey-Predator system with diffusion, time-delay and Holing type Ⅱ are invertigated by using the method of upper and lower solutions and comparison principle. It is shown that the globally asymptotically stale trivial solution (0,0) when *, the globally asymptotically stale semi-trival periodic solutions *, of the system by construction of a pair of upper and lower solution of parabolic periodic system *. It was obtained that the system have a pair of T-periodic quasi-solutions and the sector between the quasi-solutions is an attractor of the system with respect to very nonnegative initial function.(* Indicates a formula, please see the full text)
Stability and Periodic Solution to Competitive Lotka-Volterra System with diffusion and Infinite Distributed Delay
XU Tian-hua
Journal of Chongqing Normal University , 2009,
Abstract: A competitive Lotka-volterra systemwith diffusion and infinite distributed delays is investigated. It is shown that the globally asymptotically stable trivial solution, when r1(ai)>=0,(i=1,2),the globally asymptotically stable semi-trivial periodic solution(r1(t,x),),and 0,r2(t,x)) when p1(a1)<0,p1(a2)>=0,p1(a2)<0 of the models byconstruction of a pair of upper and lower solution (u1,u2),(0,0)of parabolic periodic system (aui(t,x)/at-Aiui(t,x)=ui(t,x)[ai(t,x)-bi(t,x)ui(t,x)],and in the use of eigenvalue theory and comparison principle. A T-periodic series are established by using the monotone iteration technique. It was obtained that the systems have a pair of periodic positive solutions with respect to every nonnegative initial function.
Existence of Wave Front Solution of the PreyPredator System with Diffusion and Delays
XU Tianhua
Journal of Chongqing Normal University , 2012,
Abstract: Wave front solutions of reactiondiffusion equations can be a good performance of the phenomenon and the nature of the shock speed disturbances with limited spread. It is important area of research of nonlinear partial differential equations. A PreyPredator system with diffusion and delays was investigated. It is shown that the existence of wave front solutions of this system when the delays τ1 and τ4 are small by constructing a pair of upper and lower solution and using the existence theory of traveling wave solution.
Non-wandering Operator in Bargmann Space
Minggang Wang,Hua Xu
Journal of Mathematics Research , 2010, DOI: 10.5539/jmr.v2n2p34
Abstract: In this paper the Bargmann space is denoted by F. This space’s roots can be found in mathematical problem of relativistic physics or in quantum optics. In physics the Bargmann space contains the canonical coherent states, so it is the main tool for studying the bosonic coherent state theory of radiation field and for other application .This paper deals with the unilateral backward shift operator T on a Bargmann space F. We provide a sufficient condition for an unbounded operator to be non-wandering operator, and then apply the condition to give a necessary and sufficient condition in order that T be a non-wandering operator.
A Novel Four-Dimensional Energy-Saving and Emission-Reduction System and Its Linear Feedback Control
Minggang Wang,Hua Xu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/842716
Abstract: This paper reports a new four-dimensional energy-saving and emission-reduction chaotic system. The system is obtained in accordance with the complicated relationship between energy saving and emission reduction, carbon emission, economic growth, and new energy development. The dynamics behavior of the system will be analyzed by means of Lyapunov exponents and equilibrium points. Linear feedback control methods are used to suppress chaos to unstable equilibrium. Numerical simulations are presented to show these results. 1. Introduction Since energy saving and emission reduction is the most effective way to control carbon emissions, how to promote energy saving and emission reduction is becoming the hot topic of academic research. Calculation and control analysis of carbon emissions have attracted a great deal of attention from various fields of researchers. Feng et al. [1] conducted a research on the long-run equilibrium relationships, temporal dynamic relationships, and causal relationships between energy consumption structure, economic structure, and energy intensity in China. In order to decrease energy intensity, the Chinese government should continue to reduce the proportion of coal in energy consumption, increase the utilization efficiency of coal, and promote the upgrade of economic structure. Amjad et al. [2] indicated that petroleum is the major energy consumption of most of the nations in the world, so taking actions to reduce the petroleum consumption, such as replacing the diesel locomotive with hybrid electrical vehicle, could reduce humans dependence on petroleum and hence decrease carbon emissions. Liao [3] analyzed the role of developing hydro-energy, wind energy, nuclear power, and so forth. Guo et al. [4] found technical innovations and standard management a decisive role in the energy use per unit of GDP, for which the ratio of oil consumption was the major limiting factor. Mendiluce et al. [5] compared the evolution of energy intensity in Spain with that in the EU15 and found the increasing of energy intensity in Spain since 1990 is mainly due to strong transport growth and the construction boom. From the above analysis, we can see that previous researches mainly explored the influence of energy intensity by energy structures, technical change and management level, energy consumption structure, economic structure, energy prices, and so on [4, 6]. Some were proceeded from the world or state perspectives [4–6], some from provincial and local governments perspectives [7, 8], which figured out the variables which influence energy
Synchronization of Fractional-order Chaotic Systems with Gaussian fluctuation by Sliding Mode Control
Yong Xu,Hua Wang
Physics , 2013,
Abstract: This paper is devoted to the problem of synchronization between fractional-order chaotic systems with Gaussian fluctuation by the method of fractional-order sliding mode control. A fractional integral (FI) sliding surface is proposed for synchronizing the uncertain fractional-order system, and then the sliding mode control technique is carried out to realize the synchronization of the given systems. One theorem about sliding mode controller is presented to prove the proposed controller can make the system synchronize. As a case study, the presented method is applied to the fractional-order Chen-L\"u system as the drive-response dynamical system. Simulation results show a good performance of the proposed control approach in synchronizing the chaotic systems in presence of Gaussian noise.
Structural heterogeneity and its role in determining properties of disordered solids
Hua Tong,Ning Xu
Physics , 2014, DOI: 10.1103/PhysRevE.90.010401
Abstract: We construct a new order parameter from the normal modes of vibration, based on the consideration of energy equipartition, to quantify the structural heterogeneity in disordered solids. The order parameter exhibits strong spatial correlations with low-temperature single particle dynamics and local structural entropy. To characterize the role of particles with the most defective local structures identified by the order parameter, we pin them and study how properties of disordered solids respond to the pinning. It turns out that these particles are responsible to the quasilocalized low-frequency vibration, instability, softening, and nonaffinity of disordered solids.
Concentration of the Spectral Measure for Large Random Matrices with Stable Entries
Christian Houdré,Hua Xu
Mathematics , 2007,
Abstract: We derive concentration inequalities for functions of the empirical measure of large random matrices with infinitely divisible entries and, in particular, stable ones. We also give concentration results for some other functionals of these random matrices, such as the largest eigenvalue or the largest singular value.
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