Control And Handoff On Fuzzy Discrete Event System Automaton Composition

This paper deals with the fuzzy discrete event system(FDES) which is a class of discrete event systems aiming at some characteristics of the object and the environment, considering the uncertainity of the system.This article provides a scientific theory and method which can be used to determine the uncertainty of certainty looking natured real world objects and also suitable to research the complexity of nonlinear systems related to human subjective judgments.In the traditional DES(Crisp DES) theory,the finite automata model is often used for discrete event systems.In order to establish the FDES model,the traditional finite automata model is expanded to the fuzzy finite automata model state,where the traditional state vector and the state transition matrix are expanded for the fuzzy state vector and the fuzzy state transition matrix.Therefore the fuzzy finite state machine model can be established for each part then system model can be obtained through composition model.Aiming at FDES automata composition the automaton composition model based on max-product is proposed,and the state transfer theorem with max-product algorithm is proved.On foundation of average tensor algorithm,the FDES automata composed method is put forward,and the state transfer theorem with average tensor algorithm is also proved. These two theorems are proved by illustrated examples showing they have a very good effect in reducing complexicity and time saving,then comparision between the various FDES automata composition methods is made.Modeling of system with FDES automaton is researched,decision making model is put forward and then it is online optimized.Aiming at a practical system a fuzzy discrete automaton modeling method is proposed with look-forward tree optimization control strategy.Control aspects of the system is set on priority level,and two types of optimization control strategy is presented:event optimization based on cost and event optimization based on the sequential logic,then FDES look-forward tree model is simplified. This paper also proposes a expansion composition of heterogenous networks FDES automata,the performance function of the network is given.FDES automaton is used in vertical handoff in heterogenous network,the vertical handoff is constructed,and FDES automaton model is established.According to the effectiveness function of vertical handoff,the quality of service(QoS) in heterogenous network in certain moment of time can be calculated,simultaneously handoff rules in according to individual choice and terminal speed can be formed.This paper studies about the application of FDES automaton in air-conditioning(AC) system for energy saving.The cooling load of air-conditioning system is predicted,energy consumption model of chilled,cooling water pump and fan of AC system is established. Through the comparison of actual load and predicted load,air-conditioning system control strategy is developed.In order to achieve further energy-saving of AC system,through the composition of FDES automata,the priority model of AC control system is established. Finally,through the load adjustment FDES model,it is proved that energy control of AC system based on FDES automata is better than that of the conventional variable frequency control.A Vehicle area network(VAN) FDES automata model is established in this paper, and by means of performance function,vehicle area network handoff priority is observed, and the handoff rules and the implementation rules is formulated and described respectively.Finally through NS2 network software simulation analysis is done such as vertical handoff process of vehicle area network,TCP delay,throughput,the result shows that FDES automata methods can achieve the purpose of optimizing the network handoff.