On the issue of train set assignment in domestic railway network of China,a mathematical model is established focusing on a radial network with single central station,and the First-In-First-Out(FIFO) algorithm is proved as optimum method.
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Jacket platform was assumed as steel frame structure and optimum design method was performed. Total weight of the structure was selected to be optimal objectives.
建立了地震作用下导管架海洋平台结构优化的数学模型，把导管架海洋平台看作钢框架结构，并把优化方法用于结构的抗震设计中。
Compared with optimum design, the method has characters such as simpler program and less strict requirements for design model, and it is a supplement to mechanical design methods.
该方法与一般优化设计方法相比，具有编程简单、对设计模型性态无严格要求的特点，是机械设计方法的一种补充。
The great bearing interval was regarded as optimum time, and optimum method for plus tree selection was put forward by the analytical results.
提出了以定期结实年数和定期结实枝平均生长量为标准的优树选择方法。
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