[NAB]Random seed in mobs.ml

hi.
i am graduate student in USC.i astonished the marvelous NAB so far.
however, i found some strange result for epfl mobility model ( u know the campus map model)

our research group under Prof. Helmy increases the node speed in the simulation.
The uniway point model is affected by the increasing node speed.
However, the epfl model shows us a same result(cost reslut) as we increase them from 1.0 to 3.0.
- we use the hook function in the lesson3.ml to calculate the costs.

Here is my observation,in general cases, to generate the random number we need the random seed, right?
but when i checked the mobs.ml the random seed is initialized  by zero from the start then it is increased by 1.
i think this will cause same sequence pattern of generating random numbers. As I know, in general, the random seed grabs the time information when it is run. ( randomseed = time(); ). 

Does anybody have an idear about my oppinion??

thanks for ur reading this.