In this paper,a survey on video transcoding in DCT-domain,including several typical architectures,key techniques and an optimal transcoding strategy,and various existing algorithms to analyze their advantages and disadvantages respectively are presented.

Study on mine fire comprehensive prevention of genetic algorithms optimal strategy;

Realization of optimal strategy for power system low-frequency and low-voltage load reduction;

Aim at the countermeasure between missiles and targets in space,the space simulation model based on differential games for SAM was established and its optimal strategy of resistance was deduced Moreover the adaptive critic neural networks arithmetic method was presented and used to calculated the simulation model.

In this paper we discuss the optimal problem on a discrete-time,single item, periodic review inventory system with yield and demand uncertainty, the main objective is to analyze how the uncertainty of yield rate and demand affect the optimal policy and cost in the system.

By using the dynamic programming method the optimal policy is obtained.

Revise the value coefficient of linear programming about production plan problem whose optimum solution had been obtained,and build mathematical model of cost minimization,give optimal policy that total revene increase the fixed value under the condition of unchangeable optimum base of original linear programming.

Using the method of entending state space, we build the optimal equations (OE) and supply some conditions under which the solution of OE and optimal policies existe.

The problems of the intrinsic structures of some optimal policies are discussed.

The optimum strategy based on fixed embedding principle is determined and a multi-period SUE assignment model as well as the algorithm is given.