In this paper, based on the principle of maximum profit, a mathematical model of unit which is unit economy operation is presented.
为此，根据企业利润最大化原则建立机组经济运行数学模型，并用改进粒子群算法对模型优化求解。
2
At the background of Sanghai area with prosperous economy and huge traffic, corresponding mathematical model is established to analyze and evaluate the synthetical effect of tolling.
以经济发达、交通量大的上海地区为研究背景，建立相应的数学模型，分析评价高速公路收费的综合效益。
3
According to the characteristics of technology and economy of city untreated sewage source heat pump system, the mathematical models of annual cost object function are established.