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9. SIMULATION PERFORMANCES
Real time simulation performances are shown in
the Simulation Performance form. The detail of
simulation performance can be saved into text
file. To save the performance files, see section
The Simulation Performance form, which can be
press a function key F7, consists of two real time
report: Average Instantaneous and System
Performance. The Average Instantaneous
performances are the average of measurements at
that particular time of the simulation. For
example if at this moment there are 7 pedestrians
in the traps, then the Average Instantaneous will
report the average performances over these seven
pedestrians. Instantaneous speed, delay and
uncomfortability index are respectively the speed,
delay and uncomfortability at this moment of all
pedestrians in the trap.
Homogeneity is the average performance of neighborhood indices. It measures in the
neighborhood, the number of pedestrian who has the same way with the agent compare to
the total number of pedestrian in the neighborhood. The neighborhood is defined as 2
times influence radius. The individual value of Homogeneity index (NHI) is 1 if all
neighbors are the same way with the actor and zero if the actor is alone.
Similar to homogeneity, the uniformity velocity (NUVI) is also the average performance
of neighborhood indices . It is the ratio of norm of the difference velocities between the
actor agent and the other pedestrians in the neighborhood compare with the norm velocity
of the actor agent itself. If all pedestrians have the same velocity and direction, the index
will be zero. If the average velocity of other pedestrians is higher than the actor's velocity
but the same direction, the index is between 0 and 1. If most other pedestrians are against
the actor's way (their velocity are negative), the index will be bigger than 1.
The system performance is the time average of the Average Instantaneous performances,
except the dissipation time. The dissipation time is calculated from the first pedestrian
who enters the trap until the last pedestrian who goes out of the trap. If the time of the
first pedestrian who enters the trap is recorded as well as the last pedestrian who goes out
of the trap, the dissipation time is simply the time difference between the last and the first
recorded time.