  "Changing-look" quasars are a new class of highly variable active galactic
nuclei that have changed their spectral type over surprisingly short timescales
of just a few years. The origin of this phenomenon is debated, but is likely to
reflect some change in the accretion flow. To investigate the disk-corona
systems in these objects, we measure optical/UV-X-ray spectral indices
($\alpha_{\rm OX}$) and Eddington ratios ($\lambda_{\rm Edd}$) of ten
previously-discovered changing-look quasars at two or more epochs. By comparing
these data with simulated results based on the behavior of X-ray binaries, we
find possible similarities in spectral indices below 1% Eddington ratio. We
further investigate the Eddington ratios of changing-look quasars before and
after their spectral type changes, and find that changing-look quasars cross
the 1% Eddington ratio boundary when their broad emission lines
disappear/emerge. This is consistent with the disk-wind model as the origin of
broad emission lines.
