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In this paper, the synchronization problem of fractional-order neural networks (FNNs) with chaotic dynamics is investigated via the intermittent control strategy. Two types of intermittent control methods, the aperiodic one and the periodic one, are applied to achieve the synchronization of the considered systems. Based on the dynamic characteristics of the intermittent control systems, the piecewise Lyapunov function method is employed to derive the synchronization criteria with less conservatism. The results under the aperiodically intermittent control show more generality than the ones via the periodically intermittent control. For each of the aperiodic and periodic cases, a simple controller design process is presented to show how to design the corresponding intermittent controller. Finally, two numerical examples are provided to demonstrate the effectiveness of the obtained theoretical results. 相似文献
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20世纪50年代是我国青藏高原登山运动和科学考察的分水岭。本文试以中国地质大学60年来开展登山科考活动为背景,介绍其发展历程及其历史贡献。 相似文献
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突出地质大学特色办好海洋科学专业 总被引：1，自引：0，他引：1
本文介绍了作者在开办海洋科学专业中的基本观点,强调地学在中国地质大学具有深厚的传统和明显的特色,把地学的基础研究和应用研究作为地质大学发展海洋学科的核心任务,是办好海洋科学专业的必由之路。 相似文献
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主要总结了近年来依托高校培养部队人才所取得的成就和经验,并积极研究探索依托培养人才模式,为提高部队科技人才素质提供借鉴。 相似文献
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Leimin Wang Zhigang Zeng Xiaofeng Zong Ming-Feng Ge 《Journal of The Franklin Institute》2019,356(6):3628-3643
In this paper, the finite-time stabilization problem for memristor-based inertial neural networks (MINNs) with discontinuous activations (DAs) and distributed delays is investigated. To deal with the discontinuous property of the MINNs, the nonsmooth analysis theory is invoked. Furthermore, to simplify the MINNs with second-order state derivative, an order-reduced method is adopted. Then the second-order MINNs is transformed into a simpler first-order differential system. Moreover, the verifiable algebraic criteria are derived for the finite-time stabilization of MINNs with DAs and distributed delays under the designed control approach. Finally, the effectiveness of the obtained results are illustrated via numerical simulations. 相似文献
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This paper concentrates on computing the stabilizing region
of PDμ controller for fractional order system with general interval uncertainties and an interval delay. The stabilizing region means the complete/approximate set of PDμ controllers that stabilize the given closed-loop control system. General interval uncertainties refer to both coefficients and orders of the fractional system suffer from interval uncertainties. Interval delay indicates that the delay also vary in a specified interval.Firstly, a method is presented to calculate the stabilizing region for general interval fractional system with an interval
time-constant delay. Based on a novel mapping function and the concept of critical controller parameters, the stabilizing region can be determined numerically. Secondly, the stabilizing region computation problem for general interval fractional system with an interval time-varyingdelay is considered. By applying a revised small-gain theorem, the stabilizing region can be calculated like the time-constant delay case. Thirdly, two alternative methods are proposed to improve the computational efficiency of stabilizing region calculation. Both methods can reduce the number of polynomials which are used to determine the stabilizing region. Examples are followed to illustrate the proposed results. 相似文献
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"定量地学与地学信息"是我校硕士生地球探测与信息技术专业的必修课,具有较强的实践性和前缘性。本文阐述了定量地学与地学信息的国内外发展状况,结合加拿大约克大学相关课程教学方法和内容,探讨了课程教学目标、内容、课程建设和相关的技术方法应用,提出了课程建设中交流型学习模式,这对于教学质量提高具有重要意义。 相似文献
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