  We have performed several simulations of black hole systems (non-rotating,
black hole spin parameter a=0.0 and rapidly rotating, a=0.95) with a
geometrically thin Keplerian disk using the newly developed RAISHIN code. The
simulation results show the formation of jets driven by the Lorentz force and
the gas pressure gradient. The jets have mildly relativistic speed (\sim 0.4c).
The matter is continuously supplied from the accretion disk and the jet
propagates outward until each applicable terminal simulation time
(non-rotating: t/\tau_S = 275 and rotating: t/tau_S = 200, \tau_S \equiv
r_S/c). It appears that a rotating black hole creates an additional, faster,
and more collimated matter-dominated inner outflow (\sim 0.5c) formed and
accelerated by the twisted magnetic field resulting from frame-dragging in the
black hole ergosphere. This is the first known simulation confirming the
formation of an inner magnetically-driven, matter-dominated jet by the
frame-dragging effect from a black hole co-rotating with a thin Keplerian disk
threaded by a vertical magnetic field. This result indicates that jet kinematic
structure depends on black hole rotation and on the initial magnetic field
configuration and strength.
