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- Tomoaki Niiyama, Yasushi Shimizu, Taizo R Kobayashi, Teruaki Okushima, Kensuke S Ikeda
- Physical review letters
- 2007

Overall homogeneity of temperature is a condition for thermal equilibrium, but, as is demonstrated by classical molecular dynamics simulations, the local temperatures of atoms in small, isolated crystalline clusters in microcanonical equilibrium are not uniform. The effective temperature determined from individual atomic velocity decreases with distance… (More)

- T Okushima
- Physical review letters
- 2003

We present a novel method for computing finite-time Lyapunov exponents and vectors, via generalizing a correction given by Goldhirsch, Sulem, and Orszag [Physica (Amsterdam) 27D, 311 (1987)]] into higher-order corrections. This method is a generalized LR method, which is, in contrast to the existing methods, applicable to multidimensional systems with… (More)

- T Okushima, T Niiyama, K S Ikeda, Y Shimizu
- Physical review. E, Statistical, nonlinear, and…
- 2009

The aim of this paper is twofold: one is to give a detailed description of an alternative graph-based analysis method, which we call saddle connectivity graph, for analyzing the global topography and the dynamical properties of many-dimensional potential-energy landscapes and the other is to give examples of applications of this method in the analysis of… (More)

- Teruaki Okushima, Hiroshi Kuratsuji
- Physical review. E, Statistical, nonlinear, and…
- 2011

A dynamical model is presented for chiral change in DNA molecules. The model is an extension of the conventional elastic model, which incorporates the structure of base pairs and uses a spinor representation for the DNA configuration together with a gauge principle. Motivated by a recent experiment reporting chiral transitions between right-handed B-DNA and… (More)

- A Hashimoto, T Okushima
- Accident; analysis and prevention
- 1990

An approach for measuring effects of policy schemes for improving marine traffic safety at channels is presented. Operational models involving traffic, channel, and ship characteristics are provided, and both collision and channel deviation risks of actual channels are quantified using them. Moreover, traffic control, speed regulation, and center line… (More)

- Teruaki Okushima, Hiroshi Kuratsuji
- Physical review. E, Statistical, nonlinear, and…
- 2012

We analyze the dynamics of structural transitions between normal right-handed B form and unusual left-handed Z form for a linear DNA molecule. The dynamics under the external torque in physiological buffer is modeled by a Langevin equation, with the potential term given by the authors previously [Phys. Rev. E 84, 021926 (2011)]. With this model, we first… (More)

Using microscopic models in which both photons and excitons are treated as microscopic degrees of freedom, we discuss polaritons of two cases: One is the case when excitonic parameters are time dependent. The time dependence causes creation of polaritons from a " false vacuum. " It is shown that both the creation sepctra and the creation efficiency are much… (More)

- T Okushima
- Physical review. E, Statistical, nonlinear, and…
- 2004

We propose a numerical algorithm for computing quantal dynamics, which is tailored for a generic multidimensional model of low-energy dynamics, i.e., polynomially interacting oscillator system. This algorithm evaluates symplectic integrators effectively, by using block tridiagonality of the interaction operator, and thus accurately preserves unitarity with… (More)

- J Yoshino, S Nakazawa, +5 authors S Watanabe
- Endoscopy
- 1999

BACKGROUND AND STUDY AIMS
In three-dimensional endoscopic ultrasonography (3D-EUS), a surface-rendering method can provide both a surface image and a cross-sectional ultrasonographic image. We evaluated the usefulness of this imaging method for digestive tract lesions.
PATIENTS AND METHODS
A total of 30 patients underwent 3D-EUS with surface-rendering… (More)

- T Okushima, T Niiyama, K S Ikeda, Y Shimizu
- Physical review. E, Statistical, nonlinear, and…
- 2007

A mapping called a connectivity graph is proposed to visualize the complicated networks between local minima via saddles on many-dimensional potential energy surfaces. With this mapping, the effect of the topography of a complex potential energy surface on the dynamics is studied in model funnel potentials and a Lennard-Jones cluster. We present strong… (More)