Proposes an optimum mathematical model of heating systems with a minimum life cycle cost being the programming object.

建立了以寿命周期费用最小为目标的供热系统优化规划数学模型。

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By applying the theory of reliability to the analysis of the life distribution and operating cost of car axle, the model of economical policy decision about repair cycle of car axle is set up.

通过对车轴寿命分布及其运用成本的分析，运用可靠性理论建立了车轴检修周期经济决策模型。

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Then, life cycle cost data warehouse model was designed via features of cost collection object ending up with the establishment of data warehouse system acquiring cost data as data source.

再以成本收集对象的特性设计全生命周期成本数据仓库数据模型，以所获取的成本数据作为数据仓库的数据源，建立了数据仓库。

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