Based on the principles of the basic simplex method, taking into account the effects of both the inspection coefficients and the taken values of entering variables on the objective function, an improved algorithm of the basic simplex method is presented by modifying the rules which determine the entering and leaving variables.

The input transformation technique is applied to decouple the active and reactive power flow.

This paper studies the problem of the solution to the unlimited optimization of quadratic differentiable function f(X)by means of variable transformation, presents a characteristic value method, and solves the direction of search when Hesse matrix is non-definite,The calculations show that the algorithm is satisfactory in both the number of interatives and the stability of the numerical value.

This paper gives the general solutions of the six order inhomogeneous linear differential equation with variable coefficients,by the method of the variable transformation.

Fuzzy approach to identification of input variable;

The determination of the domain of input variables has guidance on test data selection, especially on boundary value analysis.

For the existed car-following models for microscopic traffic flow simulation, most of them were developed on the basis of the sensible understanding to traffic phenomena, some of them have made statistical analysis of the field data, but have not come down to the question of the choice of input variables.