排序方式: 共有75条查询结果,搜索用时 15 毫秒
51.
网络科学中统一混合理论模型的若干研究进展 总被引:7,自引:0,他引:7
复杂网络的理论模型研究一直是网络科学的最重要课题之一.首先概述网络科学理论发展史上的3个里程碑以及有权演化网络的发展概况.为了全面反映确定性与随机性混合的真实世界的统一性、多样性和复杂性,使网络理论模型更加接近实际网络的全面特性,着重评述近年来发展的统一混合网络理论模型的3部曲:和谐混合择优模型、统一混合网络模型和统一混合变速增长网络模型,总结和评述了混合理论模型3部曲的不同特点和相互联系,揭示了统一混合网络的复杂性与普适性及其错综复杂的转变关系.最后指出, 该理论在多层次高科技网络等实际网络中的应用前景. 相似文献
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We propose a method that allows one to control spatiotemporal chaos by applying pulses proportional to the system variables and compressing the phase space of strange attractor in nonlinear system. The method is illustrated by the coupled map lattices at different strengths of coupling. Various numerical results are given. The advantage of this method is that it does not need to know any previous knowledge of the system dynamics. 相似文献
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A quantum information network with the structure of the property and information characteristic is studied. Under Gaussian channel is proposed. The network topological the catastrophic and exponential external field driving, the degree distribution has the spatial and temporal characteristics, and the positive or negative power index appears, which can influence the assortativity coefficient. This is possibly helpful to open a way to using the different type of driving to introduce the expected properties for the network. 相似文献
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Topological Properties and Transition Features Generated by a New Hybrid Preferential Model 总被引:15,自引:0,他引:15 下载免费PDF全文
A new hybrid preferential model (HPM) is proposed for generating both scale-free and small world properties. The topological transition features in the HPM from random preferential attachment to deterministic preferential attachment are investigated. It is found that the exponents γ of the power law are very sensitive to the hybrid ratio (d/r) of determination to random attachment, and γ increases as the ratio d/r increases. It is also found that there exists a threshold at d/r = 1/1, beyond which γ increases rapidly and can tend to infinity if there is no random preferential attachment (r= 0), which implies that the power law scaling disappears completely.Moreover, it is also found that when the ratio d/r increases, the average path length L is decreased, while the average clustering coefficient C is increased. Compared to the BA model and random graph, the new HPM has both the smallest L and the biggest C, which is consistent with most real-world growing networks. 相似文献
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非线性系统中混沌控制方法,同步原理及其应用前景(二) 总被引:59,自引:1,他引:58
非线性系统中混沌控制方法、同步原理及其应用前景(二)方锦清(中国原子能科学研究院,北京102413)第二部分混沌同步的类型及其原理引言:同步现象及其渊源在自然界及实验里存在大量的同步现象,有相当大的普遍性,渊如源悠久。但是,发现混沌同步现象,却是九... 相似文献
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The Kapchinsky-Vladimirsky beam through an alternating-gradient quadrupole magnetic field is studied using the particle-core model. The beam halo-chaos is found, and the soliton controller is proposed based on the mechanism of halo formation and strategy of controlling halo-chaos. We perform a multiparticle simulation to control the halo by soliton controller, and find that the halo-chaos and its regeneration can be eliminated. It is shown that our control method is effective. 相似文献
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This paper studies the Kapchinsky-Vladimirsky (K-V) beam through a triangle periodic-focusing magnetic field by using the particle-core model. The beam halo-chaos is found, and an idea of Gauss function controller is proposed based on the strategy of controlling the halo-chaos. It performs multiparticle simulation to control the halo by using the Gauss function control method. The numerical results show that the halo-chaos and its regeneration can be eliminated effectively, and that the radial particle density is uniform at the centre of the beam as long as the control method and appropriate parameter are chosen. 相似文献