AIM This study aimed to examine sex and age differences of various stepping movements in the elderly and to clarify useful stepping movements for evaluation of their dynamic balance. METHODS Two hundred and eighty-six healthy elderly subjects who could walk independently (male mean age = 71.2 +/- 7.1 years; female mean age = 71.5 +/- 6.0) performed the following stepping tests: back and forth...

We present a parallel time-stepping method for fluid-structure interactions. The interaction between the incompressible Navier-Stokes equations and hyperelastic solid is formulated in fully monolithic framework. Discretization space based on equal order finite element all variables variant of Crank-Nicolson scheme used as second time integrator. To accelerate solution systems, we analyze parall...

This article is concerned with new strategies with which explicit time-stepping procedures of PDE-based restoration models converge with a similar efficiency to implicit algorithms. Conventional explicit algorithms often require hundreds of iterations to converge. In order to overcome the difficulty and to further improve image quality, the article introduces new spatially variable constraint t...

In this paper we propose a dual-time stepping scheme for the Smoothed Particle Hydrodynamics (SPH) method. Dual-time has been used in context of other numerical methods simulation incompressible fluid flows. Here provide that combines entropically damped artificial compressibility (EDAC) along with stepping. The method is accurate, robust, and demonstrates up to seven times better performance t...

In this paper, we present a second-order accurate adaptive algorithm for solving multi-phase, incompressible flow in porous media. We assume a multi-phase form of Darcy's law with relative permeabilities given as a function of the phase saturation. The remaining equations express conservation of mass for the fluid constituents. In this setting, the total velocity, defined to be the sum of the p...

We make an initial investigation into the temporal efficiency of a fully discrete summation-by-parts approach for stiff unsteady flows with boundary layers. As a model problem for the Navier-Stokes equations we consider a two-dimensional advection-diffusion problem with a boundary layer. The problem is discretized in space using finite difference approximations on summation-by-parts form togeth...

In this paper, we present and analyze the performance of a fast parallel distributed computing time integration procedure for systems of Reaction-Convection-Diffusion equations. Typical applications include large scale computing of air quality models or population models in biology for which the main solver corresponds to a ReactionConvection-Diffusion operator. One starts from a stabilized exp...