为解决这一问题，研究了灰色组合模型在发动机研制费用估算中的应用。
This paper suggests Gray combined Model should be used in estimating the Engine Development Cost so as to solve the problem mentioned above.
针对每个阶段的不同特点和要求，分析了该阶段的费用构成，并采用相应的方法建立了各自的估算模型。
And then according to the different characteristics and requirements of each phase, it analyzes the cost composing of this phase and establishes the estimating model respectively.
分析了影响土地成本费用的主要因素，提出了控制的主要措施、地价的测算模型和土地费用估算方法。
Analysis the main factors about land cost influence, and provides the main control measures. Put forwards the price model about land calculation, and estimates the land cost.
软件保障模型估算的研究对提高软件保障费用估算的精度和效率有重要意义。
Research on software support cost estimate model is important to the precision and efficiency of software cost estimate.
将模拟结果代入相关的费用计算模型，并利用探试成本函数概念，估算不同切割位置分离序列的年总成本。
The simulation results were substituted in the cost models and annual total costs of separation sequences were estimated, taking account of heuristic cost function.
将模拟结果代入相关的费用计算模型，并利用探试成本函数概念，估算不同切割位置分离序列的年总成本。
The simulation results were substituted in the cost models and annual total costs of separation sequences were estimated, taking account of heuristic cost function.
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