A Numerical Approach to the Repairman Problem with Two Different Types of Machine
研究两类不同机器（优先与普通）在单维修工、先到先服务规则下的故障与维修模型，给出稳态运行指标如机器可用率、平均等待时间等，并用数值例子说明。
In this paper we deal with a heterogeneous machine-interference model under the assumption that the priority machines have pre-emptive priority over the ordinary ones. In each group, machines are characterized by exponentially distributed failure and repair times with different rates. The failed machines are served by a single repairman according to FIFO discipline. The aim of the paper is to give the steady-state operational characteristics of the system, such as operative utilization, expected busy-period length, machine availability, mean waiting times and average number of failed machines. Finally, numerical examples illustrate the problem in question.