  Let $A$ be a proper non-positive dg algebra over a field $k$. For a
simple-minded collection of the finite-dimensional derived category
$\mathcal{D}_{fd}(A)$, we construct a 'dual' silting object of the perfect
derived category $\mathrm{per}(A)$ by using the Koszul duality for dg algebras.
This induces a one-to-one correspondence between the equivalence classes of
silting objects in $\mathrm{per}(A)$ and algebraic t-structures of
$\mathcal{D}_{fd}(A)$.
