基于Matlab的Poisson分布随机数的Monte carlo模拟

给出了三种随机模拟:Poisson分布随机数的方法,用Matlab7.0软件实现了对Poisson分布随机数的随机模拟,并用随机模拟的方法解决了商品销售、母鸡下蛋等实际应用问题.     

Discontinuous event-trigger scheme for global stabilization of state-dependent switching neural networks with communication delay

This paper is concerned with the global stabilization of state-dependent switching neural networks(SDSNNs)viadiscontinuous event-triggered control with network-induced communication delay.Aiming at decreasing triggering times,a discontinuous event-trigger scheme is utilized to determine whether the sampling information is required to be sent outor not.Meanwhile,under the effect of communication delay,the trigger condition and SDSNNs are transformed into twotractable models by designing a fictitious delay function.Then,using the Lyapunov–Krasovskii stability theory,someinequality estimation techniques,and extended reciprocally convex combination method,two sufficient criteria are established for ensuring the global stabilization of the resulting closed-loop SDSNNs,respectively.A unified framework isderived that has the ability to handle the simultaneous existence of the communication delay,the properties of discontinuousevent-trigger scheme,as well as feedback controller design.Additionally,the developed results demonstrate a quantitativerelationship among the event trigger parameter,communication delay,and triggering times.Finally,two numerical examples are presented to illustrate the usefulness of the developed stabilization scheme.     

具有随机足标的弱相依高斯序列最大值的极限分布

设ξ1,ξ2,…为标准化的平稳高斯序列.Mn=max.ξi,协方差Υn=Cov(ξ1,ξn+1)=E(ξ1ξn+1).{N(n)}为-列取正整数的随机变量,满足 0,n→∞.在条件Υnlogn→0,n→∞之下,给出了 MN(n)的极限分布.     

$\mathcal{H}_{\infty }$ state estimation for Markov jump neural networks with transition probabilities subject to the persistent dwell-time switching rule

We investigate the problem of $\mathcal{H}_{\infty}$ state estimation for discrete-time Markov jump neural networks. The transition probabilities of the Markov chain are assumed to be piecewise time-varying, and the persistent dwell-time switching rule, as a more general switching rule, is adopted to describe this variation characteristic. Afterwards, based on the classical Lyapunov stability theory, a Lyapunov function is established, in which the information about the Markov jump feature of the system mode and the persistent dwell-time switching of the transition probabilities is considered simultaneously. Furthermore, via using the stochastic analysis method and some advanced matrix transformation techniques, some sufficient conditions are obtained such that the estimation error system is mean-square exponentially stable with an $\mathcal{H}_{\infty}$ performance level, from which the specific form of the estimator can be obtained. Finally, the rationality and effectiveness of the obtained results are verified by a numerical example.     

投资基金业绩评价的DEA方法

对近几年来我国的证券投资基金业绩评价理论进行了系统回顾和总结.在分析了传统评价方法不足的基础上,对比以往文献样本容量更大和样本区间长度更长的样本,选取适当的投入指标和产出指标,运用数据包络分析方法(即DEA评价方法)对2001年1月至2005年6月共222周的33只基金的业绩进行了实证分析,以期对我国的投资基金业绩做出正确和客观的评价.     

Synchronising chaotic Chua’s circuit using switching feedback control based on piecewise quadratic Lyapunov functions

This paper investigates the chaos synchronisation between two coupled chaotic Chua's circuits. The sufficient condition presented by linear matrix inequalities (LMIs) of global asymptotic synchronisation is attained based on piecewise quadratic Lyapunov functions. First, we obtain the piecewise linear differential inclusions (pwLDIs) model of synchronisation error dynamics, then we design a switching (piecewise-linear) feedback control law to stabilise it based on the piecewise quadratic Laypunov functions. Then we give some numerical simulations to demonstrate the effectiveness of our theoretical results.     

便携式200W至500W质子交换膜燃料电池电源系统研制

本文详细介绍了便携式质子交换膜燃料电池电源系统 4个组成部分的研制 :1 )燃料电池堆 ;2 )空气供应 ;3 )氢源 ;4 )散热与控制并与其他储能化学电源的性能特点作了比较 .实验表明 ,本电源系统性能优异 ,稳定可靠