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在用流体近似法研究ＡＴＭ复用器的输入过程时，一般假设单个信源的控制过程为两状态马氏链。迭加后的输入过程是一个控制过程为多状态、连续时间、不可分马氏链的马氏调制过程。由于状态个数很大，不便于对缓冲器容量的研究。文中将它匹配成只有两个状态的半马氏调制过程，由于状态个数仅为两个，简化了理论分析和数值分析过程。
When using fluid approximation to study the input process of an ATM multiplexer, it is generally assumed that the control process of a single source is a two-state Markov chain. After the superposition of the input process is a multi-state control process, continuous time Markov chain inseparable Markov process. Due to the large number of states, it is inconvenient to study the buffer capacity. The paper matches it into a semi-Markov modulation process with only two states. Since the number of states is only two, the theoretical analysis and the numerical analysis are simplified.