APPLICATION OF AN EXPECTED COVERING MODEL TO EMERGENCY MEDICAL SERVICE SYSTEM DESIGN*
针对紧急医疗服务法案对响应时间的要求，考虑车辆可能忙碌的概率，建立期望覆盖模型，并在55节点测试案例和德克萨斯州奥斯汀33节点人口普查区进行应用，讨论模型对系统设计的启示与局限。
ABSTRACT The Emergency Medical Service (EMS) Act specifies the fraction of all demands for service that must be reached in a given amount of time for urban and rural areas. The conditions have traditionally been interpreted to apply to the case in which all EMS vehicles are available to respond to demands. A model that considers the probability of a vehicle being busy is formulated and model properties are briefly discussed. The model is then applied to two problems: a 55‐node test case and a 33‐node census tract representation of Austin, Texas. The implications of the new model for EMS system design are discussed as are the limitations of the modeling approach.