Based on gradation decreasing dimension discrete variable optimum method, for established the mathematical model calculated.
基于分层降维离散变量优化方法，对建立的数学模型进行了计算。
The method has been applied to the optimum design of discrete variable structure.
并将此方法应用于离散变量结构优化设计中。
A new rotation method of discrete variable is proposed.
提出了新的离散变量转轴法。
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