This paper analyzes the character of the long-run cost function with Cobb-Douglas production function.

The authors study the determination method of long-run cost function under the condition of general cobb-Douglas production function.

We prove that the long run cost function is a power function of output, and point out the special relationship between long run marginal cost function and long run average cost function.

We prove that the long run cost function is a power function of output, and point out the special relationship between long run marginal cost function and long run average cost function.

This paper mainly studies the interior connections among long-run cost function,short-run cost function and graphs,when the production function is C-D production function with the input elements being k.

Median regression was performed to estimate the multi-output cost function and marginal cost of discharge patients,and scale economies were calculated.

The paper discusses the broad applicability of the railway transport trans-log cost function under the condition of different research aim,studies the variables selection of China passenger / freight transport cost function and depicts on the practical application of railway transport cost function in the research on railway economic problem.

In this paper,by using cost functions of flights,a model is presented to schedule aircraft landings,which satisfies the landing intervals and separation constraints,and puts forward a heuristic algorithm by using local search and linear programming.