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Measuring complexity 测量的复杂性
Pub Date : 2019-09-29 DOI: 10.1007/978-94-007-2807-3_2
K. Wiesner, J. Ladyman
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引用次数: 20
Multivaluedness Aspects in Self-Organization, Complexity and Computations Investigations by Strong Anticipation 基于强预期的自组织、复杂性和计算研究中的多值性
Pub Date : 2019-07-09 DOI: 10.1007/978-3-319-58996-1_3
A. Makarenko
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引用次数: 3
Onset of synchronization in networks of second-order Kuramoto oscillators with delayed coupling: Exact results and application to phase-locked loops 具有延迟耦合的二阶Kuramoto振子网络的同步起始:精确结果及其在锁相环中的应用
Pub Date : 2019-06-06 DOI: 10.1103/PHYSREVRESEARCH.2.023183
D. M'etivier, L. Wetzel, Shamik Gupta
We consider the inertial Kuramoto model of $N$ globally coupled oscillators characterized by both their phase and angular velocity, in which there is a time delay in the interaction between the oscillators. Besides the academic interest, we show that the model can be related to a network of phase-locked loops widely used in electronic circuits for generating a stable frequency at multiples of an input frequency. We study the model for a generic choice of the natural frequency distribution of the oscillators, to elucidate how a synchronized phase bifurcates from an incoherent phase as the coupling constant between the oscillators is tuned. We show that in contrast to the case with no delay, here the system in the stationary state may exhibit either a subcritical or a supercritical bifurcation between a synchronized and an incoherent phase, which is dictated by the value of the delay present in the interaction and the precise value of inertia of the oscillators. Our theoretical analysis, performed in the limit $N to infty$, is based on an unstable manifold expansion in the vicinity of the bifurcation, which we apply to the kinetic equation satisfied by the single-oscillator distribution function. We check our results by performing direct numerical integration of the dynamics for large $N$, and highlight the subtleties arising from having a finite number of oscillators.
我们考虑了具有相位和角速度特征的$N$全局耦合振子的惯性Kuramoto模型,其中振子之间的相互作用存在时间延迟。除了学术兴趣之外,我们还表明该模型可以与电子电路中广泛使用的锁相环网络相关,用于在输入频率的倍数下产生稳定的频率。我们研究了振子固有频率分布的一般选择模型,以阐明当振子之间的耦合常数被调谐时,同步相位如何从非相干相位分叉。我们表明,与没有延迟的情况相反,这里的系统在静止状态下可能表现出同步相位和非相干相位之间的亚临界或超临界分岔,这是由相互作用中存在的延迟值和振荡器的精确惯性值决定的。我们在极限$N to infty$中进行的理论分析是基于在分岔附近的不稳定流形展开,我们将其应用于由单振分布函数满足的动力学方程。我们通过对大型$N$的动力学进行直接数值积分来检查我们的结果,并强调具有有限数量的振子所引起的微妙之处。
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引用次数: 3
Temporal self-similar synchronization patterns and scaling in repulsively coupled oscillators 排斥耦合振荡器的时间自相似同步模式和标度
Pub Date : 2017-05-11 DOI: 10.29195/iascs.01.01.0019
D. Labavić, H. Meyer-Ortmanns
We study synchronization patterns in repulsively coupled Kuramoto oscillators and focus on the impact of disorder in the natural frequencies. Among other choices we select the grid size and topology in a way that we observe a dynamically induced dimensional reduction with a continuum of attractors as long as the natural frequencies are uniformly chosen. When we introduce disorder in these frequencies, we find limit cycles with periods that are orders of magnitude longer than the natural frequencies of individual oscillators. Moreover we identify sequences of temporary patterns of phase-locked motion, which are self-similar in time and whose periods scale with a power of the inverse width about a uniform frequency distribution. This behavior provides challenges for future research.
我们研究了排斥耦合Kuramoto振荡器的同步模式,重点研究了固有频率中无序的影响。在其他选择中,我们以一种方式选择网格大小和拓扑结构,只要统一选择固有频率,我们就可以观察到具有连续吸引子的动态诱导降维。当我们在这些频率中引入无序时,我们发现周期比单个振子的固有频率长几个数量级的极限环。此外,我们还确定了锁相运动的临时模式序列,这些序列在时间上是自相似的,其周期以均匀频率分布的逆宽度的幂次表示。这种行为为未来的研究提供了挑战。
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引用次数: 0
Sensitive Dependence of Optimal Network Dynamics on Network Structure 最优网络动力学对网络结构的敏感依赖
Pub Date : 2016-11-03 DOI: 10.1103/PhysRevX.7.041044
T. Nishikawa, Jie Sun, A. Motter
The relation between network structure and dynamics is determinant for the behavior of complex systems in numerous domains. An important long-standing problem concerns the properties of the networks that optimize the dynamics with respect to a given performance measure. Here we show that such optimization can lead to sensitive dependence of the dynamics on the structure of the network. Specifically, using diffusively coupled systems as examples, we demonstrate that the stability of a dynamical state can exhibit sensitivity to unweighted structural perturbations (i.e., link removals and node additions) for undirected optimal networks and to weighted perturbations (i.e., small changes in link weights) for directed optimal networks. As mechanisms underlying this sensitivity, we identify discontinuous transitions occurring in the complement of undirected optimal networks and the prevalence of eigenvector degeneracy in directed optimal networks. These findings establish a unified characterization of networks optimized for dynamical stability, which we illustrate using Turing instability in activator-inhibitor systems, synchronization in power-grid networks, network diffusion, and several other network processes. Our results suggest that the network structure of a complex system operating near an optimum can potentially be fine-tuned for a significantly enhanced stability compared to what one might expect from simple extrapolation. On the other hand, they also suggest constraints on how close to the optimum the system can be in practice. Finally, the results have potential implications for biophysical networks, which have evolved under the competing pressures of optimizing fitness while remaining robust against perturbations.
网络结构与动力学之间的关系决定了复杂系统在许多领域的行为。一个重要的长期存在的问题是关于网络的特性,优化动态相对于给定的性能指标。在这里,我们表明这种优化可以导致动态对网络结构的敏感依赖。具体来说,以扩散耦合系统为例,我们证明了动态状态的稳定性对无向最优网络的非加权结构扰动(即链路移除和节点添加)和有向最优网络的加权扰动(即链路权重的微小变化)具有敏感性。作为这种敏感性的机制,我们确定了发生在无向最优网络补中的不连续转换和有向最优网络中特征向量退化的普遍性。这些发现建立了针对动态稳定性优化的网络的统一表征,我们使用激活剂-抑制剂系统中的图灵不稳定性、电网网络中的同步、网络扩散和其他几个网络过程来说明这一点。我们的结果表明,与简单的外推所期望的相比,在最优附近运行的复杂系统的网络结构可以潜在地进行微调,以显着增强稳定性。另一方面,他们也提出了在实践中如何接近最优系统的约束。最后,这些结果对生物物理网络有潜在的影响,生物物理网络在优化适应度的竞争压力下进化,同时保持对扰动的鲁棒性。
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引用次数: 28
Multistability of Phase-Locking in Equal-Frequency Kuramoto Models on Planar Graphs 平面上等频Kuramoto模型锁相的多重稳定性
Pub Date : 2016-09-08 DOI: 10.1063/1.4978697
R. Delabays, T. Coletta, P. Jacquod
The number $mathcal{N}$ of stable fixed points of locally coupled Kuramoto models depends on the topology of the network on which the model is defined. It has been shown that cycles in meshed networks play a crucial role in determining $mathcal{N}$, because any two different stable fixed points differ by a collection of loop flows on those cycles. Since the number of different loop flows increases with the length of the cycle that carries them, one expects $mathcal{N}$ to be larger in meshed networks with longer cycles. Simultaneously, the existence of more cycles in a network means more freedom to choose the location of loop flows differentiating between two stable fixed points. Therefore, $mathcal{N}$ should also be larger in networks with more cycles. We derive an algebraic upper bound for the number of stable fixed points of the Kuramoto model with identical frequencies, under the assumption that angle differences between connected nodes do not exceed $pi/2$. We obtain $mathcal{N}leqprod_{k=1}^cleft[2cdot{rm Int}(n_k/4)+1right]$, which depends both on the number $c$ of cycles and on the spectrum of their lengths ${n_k}$. We further identify network topologies carrying stable fixed points with angle differences larger than $pi/2$, which leads us to conjecture an upper bound for the number of stable fixed points for Kuramoto models on any planar network. Compared to earlier approaches that give exponential upper bounds in the total number of vertices, our bounds are much lower and therefore much closer to the true number of stable fixed points.
局部耦合Kuramoto模型稳定不动点的个数$mathcal{N}$取决于定义模型的网络的拓扑结构。已经证明,网状网络中的循环在确定$mathcal{N}$中起着至关重要的作用,因为任何两个不同的稳定不动点都不同于这些循环上的环路流的集合。由于不同环路流的数量随着承载它们的循环的长度而增加,因此人们预计$mathcal{N}$在具有较长周期的网状网络中会更大。同时,网络中环数越多,意味着在两个稳定不动点之间微分的环流位置选择的自由度越大。因此,在周期较多的网络中,$mathcal{N}$也应该更大。在连接节点之间的角度差不超过$pi/2$的假设下,我们导出了具有相同频率的Kuramoto模型的稳定不动点数目的代数上界。我们得到$mathcal{N}leqprod_{k=1}^cleft[2cdot{rm Int}(n_k/4)+1right]$,它既取决于周期数$c$,也取决于周期长度的谱${n_k}$。我们进一步确定了带有角度差大于$pi/2$的稳定不动点的网络拓扑,这使我们推测了任意平面网络上Kuramoto模型的稳定不动点数量的上界。与之前给出顶点总数指数上界的方法相比,我们的上界要低得多,因此更接近稳定不动点的真实数量。
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引用次数: 33
Spatial averaging of a dissipative particle dynamics model for active suspensions 主动悬架耗散粒子动力学模型的空间平均
Pub Date : 2016-04-17 DOI: 10.1063/1.5024746
A. Panchenko, D. F. Hinz, E. Fried
Starting from a fine-scale dissipative particle dynamics (DPD) model of self-motile point particles, we derive meso-scale continuum equations by applying a spatial averaging version of the Irving--Kirkwood--Noll procedure. Since the method does not rely on kinetic theory, the derivation is valid for highly concentrated particle systems. Spatial averaging yields a stochastic continuum equations similar to those of Toner and Tu. However, our theory also involves a constitutive equation for the average fluctuation force. According to this equation, both the strength and the probability distribution vary with time and position through the effective mass density. The statistics of the fluctuation force also depend on the fine scale dissipative force equation, the physical temperature, and two additional parameters which characterize fluctuation strengths. Although the self-propulsion force entering our DPD model contains no explicit mechanism for aligning the velocities of neighboring particles, our averaged coarse-scale equations include the commonly encountered cubically nonlinear (internal) body force density.
从自运动点粒子的精细尺度耗散粒子动力学(DPD)模型出发,我们通过应用Irving- Kirkwood- Noll过程的空间平均版本推导出中尺度连续方程组。由于该方法不依赖于动力学理论,推导是有效的高度集中的粒子系统。空间平均得到一个类似于Toner和Tu的随机连续方程,然而,我们的理论也涉及一个平均波动力的本构方程。根据该方程,强度和概率分布通过有效质量密度随时间和位置的变化而变化。波动力的统计还取决于细尺度耗散力方程、物理温度和表征波动强度的两个附加参数。虽然进入我们的DPD模型的自推进力没有明确的机制来对准邻近粒子的速度,但我们的平均粗尺度方程包含了常见的三次非线性(内部)体力密度。
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引用次数: 4
A criterion for timescale decomposition of external inputs for generalized phase reduction of limit-cycle oscillators 极限环振荡器广义减相外部输入的时间尺度分解准则
Pub Date : 2015-09-07 DOI: 10.1587/nolta.6.171
W. Kurebayashi, Sho Shirasaka, H. Nakao
The phase reduction method is a dimension reduction method for weakly driven limit-cycle oscillators, which has played an important role in the theoretical analysis of synchro- nization phenomena. Recently, we proposed a generalization of the phase reduction method [W. Kurebayashi et al., Phys. Rev. Lett. 111, 2013]. This generalized phase reduction method can robustly predict the dynamics of strongly driven oscillators, for which the conventional phase reduction method fails. In this generalized method, the external input to the oscillator should be properly decomposed into a slowly varying component and remaining weak fluctua- tions. In this paper, we propose a simple criterion for timescale decomposition of the external input, which gives accurate prediction of the phase dynamics and enables us to systematically apply the generalized phase reduction method to a general class of limit-cycle oscillators. The validity of the criterion is confirmed by numerical simulations.
减相法是弱驱动极限环振荡器的一种降维方法,在同步现象的理论分析中起着重要的作用。最近,我们提出了一种相消减法的推广方法[W]。Kurebayashi et al.,物理学。[j].科学通报,2013。这种广义减相方法可以鲁棒地预测强驱动振子的动力学,而传统的减相方法无法预测强驱动振子的动力学。在这种广义方法中,应适当地将振荡器的外部输入分解为缓慢变化的分量和剩余的弱波动。在本文中,我们提出了一个对外部输入的时间尺度分解的简单准则,它给出了相位动力学的准确预测,并使我们能够系统地将广义相位缩减方法应用于一般类型的极限环振荡器。数值模拟验证了该准则的有效性。
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引用次数: 11
Entropy production of entirely diffusional Laplacian transfer and the possible role of fragmentation of the boundaries 完全扩散拉普拉斯转移的熵产生及边界破碎的可能作用
Pub Date : 2015-07-05 DOI: 10.1142/S0218348X15500267
Konstantinos Karamanos, S. Mistakidis, T. Massart, I. Mistakidis
The entropy production and the variational functional of a Laplacian diffusional field around the first four fractal iterations of a linear self-similar tree (von Koch curve) is studied analytically and detailed predictions are stated. In a next stage, these predictions are confronted with results from numerical resolution of the Laplace equation by means of Finite Elements computations. After a brief review of the existing results, the range of distances near the geometric irregularity, the so-called "Near Field", a situation never studied in the past, is treated exhaustively. We notice here that in the Near Field, the usual notion of the active zone approximation introduced by Sapoval et al. is strictly inapplicable. The basic new result is that the validity of the active-zone approximation based on irreversible thermodynamics is confirmed in this limit, and this implies a new interpretation of this notion for Laplacian diffusional fields.
分析研究了线性自相似树(von Koch曲线)前四次分形迭代的拉普拉斯扩散场的熵产和变分泛函,并给出了详细的预测。在下一阶段,这些预测将面临用有限元计算方法对拉普拉斯方程进行数值解析的结果。在对现有结果进行简要回顾之后,对几何不规则附近的距离范围,即过去从未研究过的所谓“近场”进行了详尽的研究。我们在这里注意到,在近场中,通常由Sapoval等人引入的活动带近似的概念是严格不适用的。基本的新结果是基于不可逆热力学的主动区近似的有效性在这一极限下得到了证实,这意味着对拉普拉斯扩散场的这一概念有了新的解释。
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引用次数: 2
Statistical Properties of Car Following: Theory and Driving Simulator Experiments 汽车跟随的统计特性:理论与驾驶模拟器实验
Pub Date : 2015-05-19 DOI: 10.5687/SSS.2015.149
Hiromasa Ando, I. Lubashevsky, A. Zgonnikov, Yoshiaki Saito
A fair simple car driving simulator was created based on the open source engine TORCS and used in car-following experiments aimed at studying the basic features of human behavior in car driving. Four subjects with different skill in driving real cars participated in these experiments. The subjects were instructed to drive a car without overtaking and losing sight of a lead car driven by computer at a fixed speed. Based on the collected data the distributions of the headway distance, the car velocity, acceleration, and jerk are constructed and compared with the available experimental data for the real traffic flow. A new model for the car-following is proposed to capture the found properties. As the main result, we draw a conclusion that human actions in car driving should be categorized as generalized intermittent control with noise-driven activation. Besides, we hypothesize that the car jerk together with the car acceleration are additional phase variables required for describing the dynamics of car motion governed by human drivers.
基于开源引擎TORCS,创建了一个较为简单的汽车驾驶模拟器,并将其用于汽车跟随实验,旨在研究人类在汽车驾驶中的基本行为特征。四名驾驶真车技能不同的受试者参加了这些实验。受试者被要求驾驶一辆由电脑以固定速度驾驶的车,但不能超车,也不能看不见前面的车。在此基础上,构建了车头距、车速、加速度和加速度的分布,并与实测数据进行了比较。提出了一种新的汽车跟随模型来捕捉发现的属性。结果表明,人在汽车驾驶中的行为应被归类为具有噪声驱动激活的广义间歇控制。此外,我们假设汽车加速度与汽车加速度一起是描述人类驾驶员控制的汽车运动动力学所需的附加相位变量。
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引用次数: 4
期刊
arXiv: Adaptation and Self-Organizing Systems
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