  We study the scaling behavior and critical dynamics of the resistive
transition in Josephson-junction arrays, at f=1/2 flux quantum per plaquette,
by numerical simulation of an on-site dissipation model for the dynamics. The
results are compared with recent simulations using the
resistively-shunted-junction model. For both models, we find that the
resistivity scaling and critical dynamics of the phases are well described by
the same critical temperature as for the chiral (vortex-lattice) transition,
with a power-law divergent correlation length. The behavior is consistent with
the single transition scenario, where phase and chiral variables order at the
same temperature, but with different dynamic exponents z for phase coherence
and chiral order.
