There is little difference between the results achieved by using dried or fresh yeast. However, dried yeast is almost twice as concentrated as fresh, so in a recipe calling for 30 g fresh yeast, use no more than 15 g dried yeast. Instant rapid-rise yeast is even more concentrated.
In fact, using a bit less yeast and leaving the dough to prove longer produces a better-tasting and longer-lasting loaf.
** Asian Recipes