To make effective evalutaion, control and prediction toward software quality, the establishment and application of defect information system is really a good means.

Based on the of the controversial relationship between the market system and information imperfectness as well as man s insufficiency of the ability to tackle with information, the paper gives us the reason for credit coming into being and a method of relying on supervision to regulate the market system.

Reduction of noise in flaw signals based on independent component analysis;

In order to detect pipeline by technology of magnetic flux leakage testing it is necessary to analysis flaw signal.

It also presents methods of dealing with information snares.

A method combined with global and dynamic threshold image segmentation is proposed,and by which weak defect regions in the ultrasonic C-scan image of Cu-steel surfacing are segmented effectively.