Analysis of Process of Triage in Disaster Rescue Action Using Stochastic Petri Net

To improve the rescue process, enhance the efficiency of rescue and support the decision of health service in rescue action, the process of triage in disaster rescue action performed by mobile medical unit is analyzed. Firstly, the triage procedure is analyzed qualitatively and Stochastic Petri Net is introduced briefly. Then based on qualitative analysis, the process of triage in disaster rescue action is modeled using stochastic Petri net. The stochastic Petri net model is executed with the aid of computer and its isomorphic Markov chain and relative matrix is obtained. The average delay of triage process can be measured through maneuver or actual operation and made as input parameters of the SPN model so that the steady-state probability is calculated. Furthermore the performance of the SPN model such as the probability of busy place, the expected value of the number of tokens in each place, the utilization rate of transition, the tokens´ flow rate of transition and average delay of system can be analyzed and evaluated quantitatively. The result shows that the critical segment which affects the efficiency of rescue work is obtained.