  A protoneutron star produced in a core-collapse supernova (CCSN) drives a
wind by its intense neutrino emission. We implement active-sterile neutrino
oscillations in a steady-state model of this neutrino-driven wind to study
their effects on the dynamics and nucleosynthesis of the wind in a
self-consistent manner. Using vacuum mixing parameters indicated by some
experiments for a sterile $\nu_s$ of $\sim 1$ eV in mass, we observe
interesting features of oscillations due to various feedback. For the higher
$\nu_s$ mass values, we find that oscillations can reduce the mass loss rate
and the wind velocity by a factor of $\sim 1.6$--2.7 and change the electron
fraction critical to nucleosynthesis by a significant to large amount. In the
most dramatic cases, oscillations shifts nucleosynthesis from dominant
production of $^{45}$Sc to that of $^{86}$Kr and $^{90}$Zr during the early
epochs of the CCSN evolution.
