利用位相型分布 (Phase-Type Distribution) 和拟生灭过程

（Quasi-Birth-and-Death Processes）等研究排队系统的控制问题，应用一个新的

矩阵分解方法：RG分解法，对模型进行了分析与数值求解。-The use of phase-type distributions (Phase-Type Distribution) and QBD process (Quasi-Birth-and-Death Processes) and other research queuing system control problem, the application of a new matrix decomposition method: RG decomposition method, the models are analyzed and numerically.