The new WHO Child Growth Standards confirm that children born anywhere in the world and given the optimum start in life have the potential to develop to within the same range of height and weight.

By using Particle Swarm Optimization (PSO), a model was built up for calculating the optimum dispersion height of intrusive submunition dispenser, and mathematical simulation was carried out.

For influence factors and rules of machined surface roughness, we studied on the influence factors of machined surface roughness such as scallop-height, path interval, feed rate and optimum tool path.