着重阐述了利用数字选择性呼叫技术的船舶跟踪系统的组成结构及其工作原理、技术指标；
Next, the structure, the working principles and the performance of the DSC Ship Tracking System which has been developed by the author is mainly described.
通过建立一定的数学模型，得到呼叫中心的各个数量指标，并在此基础上进行系统的优化，使得呼叫中心更好地为客户服务。
To make the call center serve the customers well, the quantitative index of it has to be obtained through the establishment of a certain mathematical model, based on which the system can be optimized.
呼叫成功率反映了PHS网络无线侧的总体接入性能，与掉话率共同成为无线侧两大关键指标。
The calls success rate reflects the total connect into function of PHS network wireless side, with drop a words rate to become two toll-gate key index signs for wireless side together.
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