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3.0

Jun 28, 2018
06/18

by
N. D. Tsigkri-DeSmedt; J. Hizanidis; P. Hoevel; A. Provata

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We study the dynamics of identical leaky integrate-and-fire neurons with symmetric non-local coupling. Upon varying control parameters (coupling strength, coupling range, refractory period) we investigate the system's behaviour and highlight the formation of chimera states. We show that the introduction of a refractory period enlarges the parameter region where chimera states appear and affects the chimera multiplicity.

Topics: Adaptation and Self-Organizing Systems, Quantitative Biology, Neurons and Cognition, Chaotic...

Source: http://arxiv.org/abs/1509.08668

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42

Sep 18, 2013
09/13

by
E. Schoell; G. Hiller; P. Hoevel; M. A. Dahlem

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The influence of time delay in systems of two coupled excitable neurons is studied in the framework of the FitzHugh-Nagumo model. Time-delay can occur in the coupling between neurons or in a self-feedback loop. The stochastic synchronization of instantaneously coupled neurons under the influence of white noise can be deliberately controlled by local time-delayed feedback. By appropriate choice of the delay time synchronization can be either enhanced or suppressed. In delay-coupled neurons,...

Source: http://arxiv.org/abs/0809.1025v1

51
51

Sep 18, 2013
09/13

by
K. B. Blyuss; Y. N. Kyrychko; P. Hoevel; E. Schoell

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We present an analysis of time-delayed feedback control used to stabilize an unstable steady state of a neutral delay differential equation. Stability of the controlled system is addressed by studying the eigenvalue spectrum of a corresponding characteristic equation with two time delays. An analytic expression for the stabilizing control strength is derived in terms of original system parameters and the time delay of the control. Theoretical and numerical results show that the interplay...

Source: http://arxiv.org/abs/1201.5964v1

46
46

Sep 18, 2013
09/13

by
Y. N. Kyrychko; K. B. Blyuss; P. Hoevel; E. Schoell

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Spectral properties and transition to instability in neutral delay differential equations are investigated in the limit of large delay. An approximation of the upper boundary of stability is found and compared to an analytically derived exact stability boundary. The approximate and exact stability borders agree quite well for the large time delay, and the inclusion of a time-delayed velocity feedback improves this agreement for small delays. Theoretical results are complemented by a numerically...

Source: http://arxiv.org/abs/1201.5957v1

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45

Sep 21, 2013
09/13

by
P. Hoevel; E. Schoell

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We show that time-delayed feedback methods, which have successfully been used to control unstable periodic ortbits, provide a tool to stabilize unstable steady states. We present an analytical investigation of the feedback scheme using the Lambert function and discuss effects of both a low-pass filter included in the control loop and non-zero latency times associated with the generation and injection of the feedback signal.

Source: http://arxiv.org/abs/cond-mat/0508367v1

97
97

Jul 20, 2013
07/13

by
B. Fiedler; V. Flunkert; M. Georgi; P. Hoevel; E. Schoell

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We refute an often invoked theorem which claims that a periodic orbit with an odd number of real Floquet multipliers greater than unity can never be stabilized by time-delayed feedback control in the form proposed by Pyragas. Using a generic normal form, we demonstrate that the unstable periodic orbit generated by a subcritical Hopf bifurcation, which has a single real unstable Floquet multiplier, can in fact be stabilized. We derive explicit analytical conditions for the control matrix in...

Source: http://arxiv.org/abs/nlin/0609056v2