  In order to obtain information about the polarized strange quark
distribution, we studied the semi-inclusive $\Lambda_c / \bar{\Lambda}_c$
production in neutrino and polarized proton collisions. We found that these
reactions are effective to clearly extract the polarization of strange quark by
measuring the spin correlation between the target proton and the produced
$\Lambda_c / \bar{\Lambda}_c$ baryon.
