Hiroya Nakao

Tokyo Institute of Technology

86Publications

20H-index

1,258Citations

Publications 90

Newest

Semiclassical optimization of entrainment stability and phase coherence in weakly forced quantum limit-cycle oscillators

#1Yuzuru KatoH-Index: 1

#2Hiroya NakaoH-Index: 20

Semiclassical optimization of entrainment stability and phase coherence in weakly forced quantum limit-cycle oscillators

#1Yuzuru Kato (TITech: Tokyo Institute of Technology)H-Index: 2

#2Yuzuru Kato (TITech: Tokyo Institute of Technology)H-Index: 1

Last.Hiroya NakaoH-Index: 20

view all 2 authors...

Optimal entrainment of a quantum nonlinear oscillator to a periodically modulated weak harmonic drive is studied in the semiclassical regime. By using the semiclassical phase reduction theory recently developed for quantum nonlinear oscillators, two types of optimization problems, one for the stability and the other for the phase coherence of the entrained state, are considered. The optimal waveforms of the periodic amplitude modulation can be derived by applying the classical optimization metho...

#1Yoshiki Kuramoto (Kyoto University)H-Index: 32

#2Hiroya Nakao (TITech: Tokyo Institute of Technology)H-Index: 20

An overview is given on two representative methods of dynamical reduction known as centre-manifold reduction and phase reduction. These theories are presented in a somewhat more unified fashion tha...

#1Yuzuru KatoH-Index: 2

#2Naoki YamamotoH-Index: 1

Last.Hiroya NakaoH-Index: 20

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Optimization of linear and nonlinear interaction schemes for stable synchronization of weakly coupled limit-cycle oscillators

#1Nobuhiro WatanabeH-Index: 1

#2Yuzuru KatoH-Index: 2

Last.Hiroya NakaoH-Index: 20

view all 4 authors...

#1Timoteo CarlettiH-Index: 15

#2Hiroya NakaoH-Index: 20

Reduction of a two-component FitzHugh-Nagumo model to a single-component model with long-range connection is considered on general networks. The reduced model describes a single chemical species reacting on the nodes and diffusing across the links of a multigraph with weighted long-range connections that naturally emerge from the adiabatic elimination, which defines a new class of networked {dynamical} systems with local and nonlocal Laplace matrices. We study the conditions for the instability ...

Optimization of linear and nonlinear interaction schemes for stable synchronization of weakly coupled limit-cycle oscillators

#1Nobuhiro WatanabeH-Index: 1

#2Yuzuru Kato (TITech: Tokyo Institute of Technology)H-Index: 1

Last.Hiroya NakaoH-Index: 20

view all 4 authors...

Optimization of mutual synchronization between a pair of limit-cycle oscillators with weak symmetric coupling is considered in the framework of the phase reduction theory. By generalizing a previous study on the optimization of cross-diffusion coupling matrices between the oscillators, we consider optimization of mutual coupling signals to maximize the linear stability of the synchronized state, which are functionals of the past time sequences of the oscillator states. For the case of linear cou...

Modeling cochlear two-tone suppression using a system of nonlinear oscillators with feed-forward coupling

#1Masanori Ouchi (TITech: Tokyo Institute of Technology)

#2Hiroya Nakao (TITech: Tokyo Institute of Technology)H-Index: 20

Mechanism of two-tone suppression is studied using a coupled-oscillator model of the cochlea with feed-forward coupling. Local amplification of sound signals is modeled by using Stuart-Landau oscillators near the Hopf bifurcation, and transmission of sound signals is described as feed-forward coupling between the oscillators. Effect of suppressor signals on the response to probe signals is analyzed by numerical simulations. It is found that the effect of suppression is qualitatively different de...

#1Kunihiko TairaH-Index: 16

#2Chi-An YehH-Index: 4

Last.Hiroya NakaoH-Index: 20

view all 3 authors...

#1Kunihiko Taira (FSU: Florida State University)H-Index: 16

#2Hiroya Nakao (TITech: Tokyo Institute of Technology)H-Index: 20

We apply the phase-reduction analysis to examine synchronization properties of periodic fluid flows. The dynamics of unsteady flows are described in terms of the phase dynamics reducing the high-dimensional fluid flow to its single scalar phase variable. We characterize the phase response to impulse perturbations, which can in turn quantify the influence of periodic perturbations on the unsteady flow. These insights from the phase-based analysis uncover the condition for synchronization. In the ...

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