Abstract:
Qualitative simulation (QS) was a technique initiated from AI in the last decade. In this paper, we discussed some basic concepts of QS in terms of state space, and based on the definition of qualitative trajectory, we first clarified the importance of creating new landmark during the simulating process in terms of qualitative state transition, meanwhile, we also proposed the concept of qualitative stability and provided the judgement condition for qualitative stability, which would strengthen the measures of global filtering of QS.