Multi-level optimization technique is an important method, which decomposes a complex optimum problem into a set of simplex optimization problems to be easily solved.
多级技术是指将一个复杂的优化问题分解为一系列的简单的优化问题，再进行求解的方法。
The object-oriented finite element program is studied. The object-oriented technique is applied to the multi-level optimization design to develop out the multi-level optimization design program.
本文开展了面向对象的有限元程序的研究，将面向对象应用于结构的多级优化设计中，开发出多级优化设计程序；
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