  We investigate dynamic transitions and stochastic resonance phenomena in
two-dimensional fully frustrated Josephson-junction arrays driven by staggered
oscillating magnetic fields. As the temperature is lowered, the dynamic order
parameter, defined to be the average staggered magnetization, is observed to
acquire nonzero values. The resulting transition is found to belong to the same
universality as the equilibrium Z_2 transition for small driving amplitudes
while large driving fields appear to induce deviation from the universality
class. The transition is also manifested by the stochastic resonance peak of
the signal-to-noise ratio, which develops above the transition temperature.
