<Introduction to discrete event systems> 学习笔记4-3

1. Continuous-Variable Dynamic Systems(CVDS) must satify:

　　(1)They are continous-state systems.

　　(2)The state transition mechanism is time-driven.

2.Discrete Event Dynamic Systems(DEDS) must satify:

　　(1)The state space is a discrete set.

　　(2) The state transition mechanism is event-driven.

3.definirion.

　　A Discrete Event System(DES)is a discrete-state,event-driven system,that is, its state evolution depends entirely on the occurence of asynchronous discrete events over time.

4.We should not confuse discrete event systems with discrete-time systems.

　　The class of discrete-time systems contains both CVDS and DES.A DES may be modeled in continuous or in discrete time.

5. Three levels of abstraction at which DES are modeled and studied:

　　untimed(or logical), timed,and stochastic.

6. Two discrete event modeling formalisms will be presented and studied:automata and Petri nets.

 

next      1.3.4 Example of Discrete Event Systems  ----P57