Per-unit system is a very important conception in short circuit calculation for the power system,while the introduction to the concept and the method of conversion are always the most difficult parts in the period of teaching.

The paper discriminates and analyses several confusing concepts in power system,that is:the conception of phase and line,per unit system,conversion,rating average voltage.

A quality evaluation system of examination questions based on the regression algorithm;

The Research of Color Measurement Instrument Based on Regression Algorithm;

Core vector regression algorithm based on enclosing ball with unchanged raclins

A fast recursive algorithm of discrete Hartley transform;

Building treeview with recursive algorithm in JSP;

Mathematical Model and Its Recursive Algorithm for Intelligently Editing and Recording CD Tracks;

Application of successive overrelaxation for support vector regression arithmetic in cholesterol measurements;

This paper discusses the theory of displacement back analysis from analyzing stress field of rock initial place and carrying out regressive calculation of ground stress,illustrates the application of displacement back analysis in engineering through examples,and studies its application prospect,in order to promote its application.

Realistic rendering of trees based on fractal recursion algorithm;

Modal-domain modelling of frequency-dependent overhead lines based on recursion algorithm;

a Recursion Algorithm to Seek the Characteristic Value of Real Symmetric Tri-diagonal Matrix;