By applying the classical accelerate damage boundary theory in package dynamics and the displacement damage boundary which had been put forward by the author recently, the relation is studied in linear system between the critical dropping high of the products and the properties of the cushioning material including the stiffness and the deformation limitation.

Geometrical principle of surface crack processing algorithm based on edge sampling;

This paper describes a compressed edge sampling algorithm in IP trace back denial - of - service attacks.

For power network parameter measuring,when the frequency departure of sine-like sig-nal or high-order harmonic disturbance occur,fast Fourier transform is used to control the initial sampling angle for maximum precision.