A new on line insulation diagnostic method, synthetic relative measuring method is presented in this paper.

An algorithm based on the magnitude and phase angle of the generalized phasor to measure instantaneous frequency and swing frequency while the power swing occurred is presented.

A new directional relay algorithm for high voltage line is proposed using generalized phasor and symmetrical component method.

In order to settle the traditional tool s problems of limited precision and applicability, the technique of tractor crankshaft synthetic measurement based on virtual instrument is introduced.

With the rapid development of manufacture technologies, the synthetic measurement of profile with large range and high precision has become more and more imminent.

The development and the present situation of the comprehensive measurement were introduced and the technique was surveyed in the way of theory analysis together with mathematics calculation and computer simulation to successive and switching variable separately.

This paper explores,theoretically and empirically,the relationship between the two kinds of such summary measures(overall health achievement index),one of which is constructed on the basis of implicit value judgment(internal weighting method),the other on the basis of external weighting method imposing direct weights to the indicator of health level as well as health distribution.

On the basis of the HOPIT adjusted self report health data collected from Jiading,Baoshan,Jinshan and Chongming,4 Districts of Shanghai,this paper presented the disability concentration index as the summary measure of the distribution of population self report health.

This paper presented the summary measure of the level of population self-report health on the basis of household health service survey eon-ducted in the Jiading, Baoshan, Jinshan and Chongming, 4 districts of Shanghai.