(1) Vehicles have a maximum velocity of 109 ft/min.
(2) Turntables have a maximum angular velocity of
90/s.
(3) The average time for a vehicle to cross a turntable is
10 s.
(4) Stocker robot cycle times are normally distributed
with a mean of 18 s and a standard deviation of 2 s.
(5) Interarrival times of lots at the source stockers are
exponential or Weibull distribution.
(6) The dispatching rule of the lots and vehicles is a
combination of the shortest distance with nearest
vehicle and the primary encounter first served.