By means of variable substitution and partial integration,this paper gives the integral conditions of one kind of first- order differential equation and puts forth the expression of general solution,and gets the simplified method of seeking solutions.

This paper points out the variable substitution method of triple integral of ellip-tical volume and examples its applications.

Two techniques of chaos synchronization, variable substitution and variable feedback, are applied to Lorenz systems.

This paper discusses the different mothods of progamming between a multi--usernetwork information system, involving the problems of setting of share environment,collisiontreatment,array variable replacement and data integrity.

In this paper,the author sums up how to choose the variable replacement.

,the active control method,global control method and variable replacement method.

In the scheme,macroblock(MB)coding modes provided by the encoder are used to decide the location of embedding,energy mapping function guarantees the visual quality and re-synchronization strategy improves the robustness of watermarking system.