  By using a new numerical code for deriving the spectral energy distributions
of galaxies, we have investigated the time evolution of morphological
properties, the star formation rate, and the submillimeter flux at 850 $\mu$m
in high-redshift ($z$) dusty starburst mergers with mass ratio ($m_{2}$) of two
disks ranging from 0.1 (minor merger) to 1.0 (major one). We found that the
maximum star-formation rate, the degree of dust extinction, and the 850 $\mu$m
flux are larger for mergers with larger $m_{2}$. The 850 $\mu$m flux from
mergers at 1.5 $\le z \le$ 3.0 in the observer frame is found to be a few mJy
for major merger cases, and at most $\sim$ 100 $\mu$Jy for minor ones. This
result suggests that only high-redshift major mergers are now detected by SCUBA
with the current 850 $\mu m$ detection limit of a few mJy. These results imply
that LMSA (ALMA) with the expected detection limit of the order of 10 $\mu$Jy
at 850 $\mu m$ can be used to study high-redshift mergers with variously
different $m_2$, and thus provide an important clue to the formation of
galaxies in a high-redshift universe.
