In the complex sound field which,for example,is made up of the sound from several running machines and the noise from environment,the diagnosis for individual machine is severely disturbed by sound from machines surrounded.

This algorithm is good and balanced for various plus noise, multiplicative noise, or complex noise.

A new adapt filtering algorithm based on minimum cumulation-squared error(MCSE) of gradients in neighborhood is proposed for infrared small dim moving target in strong complex noise entironment.

The vibrations of ground and neareby buildings indcuced by running vihcile are studied by means of onsite experiments on a complicated ground near a highway road.

By the analysis to the complex scene,a double-layer visibility culling algorithm is proposed,and the algorithm combines view frustum culling,detail culling and occlusion culling methods.

Some key technologies are discussed,such as the modeling and optimizing of cosmically and complex scene,scene database optimizing,the showing and optimizing of CAD models,the optimizing of data structures.

The complex scene of the block scheduling strategy and its improvement programme are discussed,and it is applyed to "the virtual training system of station" ,soluted the "jump flash" phenomenon in the block scheduling strategy.