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本文得到了若干关于模拟反馈联想记忆各记忆模式的吸引域及其中每一点趋向相应记忆模式的指数收敛速度的估计结果,它们可用于高效模拟反馈联想记忆的性能评价以及综合过程. 相似文献
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任何系统实际上都是在噪声环境中进行工作的.对处在噪声强度已知的噪声环境下双向联想记忆(BAM)神经网络,其平衡点具有指数渐近稳定性是网络进行异联想记忆的基础.构造一个适当的Lyapunov函数,应用It^o公式、M矩阵等工具讨论了在噪声环境下具有时滞的BAM神经网络概率1指数渐近稳定,得到了指数稳定的代数判据和两个推论,此判据只需验证仅由网络参数构成的矩阵是M矩阵即可,给网络设计带来方便.本文所得结果包括相关文献中确定性结果作为特例. 相似文献
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模拟反馈联想记忆的吸收域和指数收敛速度的估计及其应用 总被引:2,自引:0,他引:2
本文得到了若干关于模拟反馈联想记忆各记忆模式的吸收域及其中每一点趋向相应记忆模式的指数收敛速度的估计结果,它们可用于高效模拟反馈联想记忆的性能评价以及综合过程。 相似文献
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提出一种基于优化线性函数的神经网络联想记忆器,打破了将待识别模式作为网络起始点的常规,它能保证渐近稳定的平衡点集与样本点集相同,吸引域分布合理,不渐近稳定的平衡点恰为实际的拒识模式,并且电路实现容易,对拒识模式有清楚的解释。理论分析和计算机模拟都表明本文的模型是理想的联想记忆器,还可降低对硬件的精度要求。 相似文献
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一类时延反馈神经网络的稳定性及吸引域的估计 总被引:3,自引:0,他引:3
反馈型神经网络由于具有极为丰富的动力学行为和整体计算能力(如优化、联想、振荡和混饨)而倍受关注,近几年的研究表明,当网络的时延足够小时,具有延时的对称Hopfield型神经网络和无时延情况一样也是全局稳定的.本文通过构造适当Lyapunov泛函的方法,对一类具有时延的反馈型神经网络平衡点的渐近稳定性进行了分析,得到了平衡点渐近稳定的充分条件:要检验一个有时间延迟的反馈型神经网络的稳定性,只要测试一个特定矩阵的定性性质或一个特定不等式即可.最后我们也提供了一种估计网络渐近稳定平衡点吸引域的方法. 相似文献
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利用状态空间分解方法,探讨一类具有特殊激励函数的高阶Cohen-Grossberg神经网络的多周期性问题.该类神经网络的激励函数包括带有饱和区的非递减函数以及一般的细胞神经网络激励函数等.给出了保证此类网络的周期环在饱和区内局部指数收敛的充分条件.所得结果表明,一个狀维网络可以有2n个局部指数收敛的周期环存在于饱和区.最后以一个数值例子说明了所得结果的有效性. 相似文献
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通过构造适当的Lyapunov函数,利用Halanay不等式和Young不等式,讨论一类具有变时滞的Hopfield型神经网络的全局指数稳定性.在对网络施加两个不同的神经元激励函数的条件下,导出网络全局指数稳定的一个充分条件,得到的充分条件在实际应用中易于验证,且有较小的保守性,因而对网络的应用和设计具有重要意义.最后,一个数值实例进一步验证结果的正确性. 相似文献
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Lihong Huang 《Asian journal of control》2013,15(4):1158-1167
This paper considers a class of delayed neural networks with discontinuous neuron activations. Based on the theory of differential equations with discontinuous right‐hand sides, some novel sufficient conditions are derived that ensure the existence and global exponential stability of the equilibrium point. Moreover, by adopting the concept of convergence in measure, convergence behavior for the output is discussed. The obtained results are independent of the delay parameter and can be thought of as a generalization of previous results established for delayed neural networks with Lipschtz continuous neuron activations to the discontinuous case. Finally, we give a numerical example to illustrate the effectiveness and novelty of our results by comparing our results with those in the early literature. 相似文献
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A system is considered underactuated if the number of the actuator inputs is less than the number of degrees of freedom for the system. Sliding mode control for underactuated systems has been shown to be an effective way to achieve system stabilization. It involves exponentially stable sliding surfaces so that when the closed‐loop system trajectory reaches the surface, it moves along the surface while converging to the origin. In this paper, a general framework that provides sufficient conditions for asymptotic stabilization of underactuated nonlinear systems using sliding mode control in the presence of system uncertainties is presented. Specifically, it is shown that the closed‐loop system trajectories reach the sliding surface in finite time, and a constructive methodology to determine exponential stability of the closed‐loop system on the sliding surface is developed, which ensures asymptotic stability of the overall closed‐loop system. Furthermore, the aforementioned framework provides the basis to determine an estimate of the domain of attraction for the closed‐loop system with uncertainties. Finally, the results developed in the paper are experimentally validated using a linear inverted pendulum testbed to show a good match between the actual domain of attraction of the upward equilibrium state of the pendulum and its analytical estimate.Copyright © 2012 John Wiley & Sons, Ltd. 相似文献