This paper studies a continual-domain ant colony algorithm based on the overlapping mutation operation, which forms a dynamic candidate group to the solution of each component possible value, and records each possibility value information content in the candidate group.

single ramp method,two-crossed ramps method and the new method-two crossed ramps with considering spatial distortion.

Based on the research of the intersection of shot plane,this paper analyzes the important factor which affects the safety of the contemporary shot of many weapons and the reasons of the intersection of shot plane.

In allusion to the conflict points calculation and driveway setting in provincial and national main line grade crossing design as well as the main problems of traffic safety existing in constructed grade crossing, some design ideas and improvement projects are proposed in a view ofengineering design, which can be consulted by designers.