Biomedical subjects

Hidetsugu Sakaguchi

Publications and source records attributed to Hidetsugu Sakaguchi.

3 recordsLinked to original sources

PubMed2002

Stochastic synchronization in globally coupled phase oscillators.

Cooperative effects of periodic force and noise in globally coupled systems are studied using a nonlinear diffusion equation for the number density. The amplitude of the order parameter oscillation is enhanced in an intermediate range of noise strength for a globally coupled bistable system, and the order parameter oscillation is entrained to the external periodic force in an intermediate range of noise strength. These enhancement phenomena of the response of the order parameter in the deterministic equations are interpreted as stochastic resonance and stochastic synchronization in globally coupled systems.

Journal Article↗

PubMed2002

Chaotic diffusion of particles with finite mass in oscillating convection flows.

Deterministic diffusion in temporally oscillating convection is studied for particles with finite mass. The particles are assumed to obey a simple dissipative dynamical system and the particle diffusion is induced by the strange attractor. The diffusion constants are numerically calculated for convection models with free and rigid boundary conditions.

Journal Article↗

PubMed2002

Parameter evaluation from time sequences using chaos synchronization.

Unknown parameters in nonlinear equations are estimated from chaotic time sequences using chaos synchronization. The method is based on a random optimization method. The parameters are randomly searched for in a sequential manner as the degree of the chaos synchronization is increased. The method is applied for the parameter evaluation in the Lorenz equation and the Lang-Kobayashi model for the chaotic semiconductor laser.

Journal Article↗