緊急救護 救護隊 風險分析 成本配置 交互損益 到院前救護 確定模式 機率模式 到院前心肺功能停止 緊急區位配置 Emergency medical service Emergency medical service team Risk analysis Cost-arrangement Trade-off Pre-hospital care Deterministic model Probabilistic model Location set covering problem Maximal covering location problem OHCA Out of hospital cardiac arrest Emergency location set covering problem