  The possible modification of quantized conductance of one-dimensional doped
Mott insulator, where the Umklapp scattering plays an important role, is
studied based on the method by Maslov-Stone and Ponomarenko. At T=0 and away
from half-filling, the conductance is quantized as $g=2e^2/h$ and there is no
renormalization by Umklapp scattering process. At finite temperatures, however,
the quantization is affected depending on the gate voltage and temperature.
