论述现代设计理论的三大流派一般设计学、设计原理、系统设计论的主要理论与方法，并分析、比较各流派异同点及应用特点，以利于更好地将现代设计理论与方法应用于工程设计。
This essay discusses the primary theories and means general design theory, the principle of design and the system design theory, Which are three schools of thought in the modern design theory.
从热传导原理、肋片的温度分布特性等，与现代优化设计理论相结合，导出了一种关于等厚度环肋的尺寸优化的方法。
Combined with modern optimization theory, a method of size optimization for annular fins with constant thickness is derived from theory of heat conduction and temperature distribution in fins.
课题研究力图运用现代城市设计理论、方法，对城市门户开敞空间的设计原则与方法作出建设性的思考。
The study tries to apply modern city design theory and means to the open space at the city gate, and carries out constrictive consideration on its design principles and means.
因此有必要探讨基于人机工程学的公交车内环境设计理论与方法， 改进设计以满足人们对现代公交车的新需求。
So it is quite necessary to explore new design ideas which should be based on ergonomics for BIE to satisfy the above new demands.
因此有必要探讨基于人机工程学的公交车内环境设计理论与方法， 改进设计以满足人们对现代公交车的新需求。
So it is quite necessary to explore new design ideas which should be based on ergonomics for BIE to satisfy the above new demands.
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