时间作为一种刚性稀缺资源，将成为衡量成本的基本单位，在不同的管理层面上显现出重要的基础意义。
As a kind of scarcity source, time will be the basic unit to measure cost and show us an important basic sense at the various levels of management.
在建立数学模型的基础上，分析了系统长期单位时间内的期望费用，并讨论了最优年龄替换决策。
The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum age replacement decision is also discussed.
传输操作时刻表由基循环组成的系统矩阵为基础，时间间隔尺度以网络时间单元为单位实现时间同步。
On the basis of communication operation schedule for system matrix formed with basis cycle, the time synchronization of system was obtained depending on the net time unit (NTU).
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