  We study the one-dimensional diffusion process which takes place between two
reflecting boundaries and which is acted upon by a time-dependent and
spatially-constant force. The assumed force possesses both the harmonically
oscillating and the constant component. Using techniques presented in the paper
[1] we derive the set of integral equations whose comprise the Green function
for our diffusion process. In the later part we focus on the time-asymptotic
stationary regime of considered non-equilibrium process. Some of its
time-asymptotic characteristics, e.g. time-averaged and time-asymptotic
probability density of the particle coordinate, exhibit nontrivial features.
