  In a semiclassically quantized two-dimensional cosmological model, it can be
shown that the parameter of the equation of state for the accelerating universe
can be positive due to the negative energy density and the negative pressure,
which is a little different from the conventional wisdom that the parameter is
negative with the positivity of the energy density. Furthermore, we show that
the full parameter composed of the classical and the quantum-mechanical
contributions is positive and finite even though the partial state parameter
from the quantum-mechanical contribution is not positive definite, which means
that the state parameter is not perturbatively additive in this model.
