最优策略

To this kind of problem, we can only design different tactics to seek the approximate optimal solution as soon as possible.

对于此类问题，我们只能设计出不同的策略来尽可能快的求解出尽可能逼近最优解的结果。

The optimal portfolio strategy obtained by the Bellman dynamic programming principle is a special case of our result when the investor only invests the home bond and the stock.

在投资者仅投资国内债券和股票的情况下，前人用贝尔曼动态规划原理所得的最优投资策略仅是我们结果的特殊形式。

The optimal inventory and capacity joint decisions for a continuous time homogeneous inventory system with finite and infinite horizons are discussed.

在此基础上，分别求解了具有容量约束的有限时段和无限时段连续时间问题的最优存储策略。

1A study on the inventory/capacity decisions in homogeneous inventory system.

证明了在有容量约束的情况下等时间间隔补充策略最优。

First, the state～space equation of the circular inverted pend ulum system was established based on the Lagrange Equation. On the base of that, the circular inverted pendulum was swung up by the energy control strategy, and the controller of the system was designed by the pole placement of the optimal control theory. Second, in order to realize the observation for the unknown vari ables, stable state observers were designed based on the equivalent principle of sliding mode variable structure.

该方案在采用 Lagrange 函数建立状态空间方程的基础上，利用能量控制策略实现自动起摆；采用最优控制理论中的极点配置法设计倒立摆系统的控制器；同时利用滑模变结构的等值原理设计观测器，实现对系统未知状态变量的观测。

The primary work of this paper includes: 1 The general process and the fundamental theory of genetic algorithm is introduced systematically, which is also be applied to an example; 2 The penalty function method and the constraint tournament method are introduced in the paper, which are used to process the constraint limit. Via analyzing the basic principle of NSGA-II ,which is elaborated in the paper, the fast non- dominated sorting method, congestion distance and its comparison operator, the elite strategy and the main process of NSGA-II is researched particularly. 3 Via modeling the fire distribution problem, the model is computed by the algorithm of NSGA-II, which is combined with both the penalty function method and the restraint league tournament method The optimization of two goals are also realized in the paper. The results derived from the VC++6.0 indicate that, two algorithms both have the high convergence, simultaneously the Pareto optimal solution also maintain the variety of distribution.

本文所作的主要工作如下：系统地介绍了遗传算法的一般流程和基本理论，并应用于一个函数优化的实例；研究了用于处理约束限制的罚函数法和约束联赛法，论述了NSGA-II的基本原理，并对其提出的快速非支配排序法、拥挤度及其比较算子、精英策略及NSGA-II的主要流程作了详细的研究；建立了火力分配问题的模型，并将NSGA-II算法分别与罚函数法和约束联赛法相结合对该模型进行了计算，实现了对两个目标的最优化；用VC++6.0编程计算后所得的结果表明，两种算法均具有很好的收敛性，同时Pareto最优解也保持了好的多样性分布。

With appropriate crossover parameter and self-adaptive aberrance factor, the convergence of the algorithm is improved and the system's motion precision is leveraged.

同时将改进的遗传算法采用最优个体保留策略，设计交叉参数和自适应变异参数，确保算法具有良好的收敛性。

The strategy the best individual to be reserved in the ameliorated genetic algorithm operation is applied. With appropriate crossover parameter and self-adaptive aberrance factor, the convergence of the algorithm is improved and the system's motion precision is leveraged.

同时将改进的遗传算法采用最优个体保留策略，设计交叉参数和自适应变异参数，确保算法具有良好的收敛性。

Moreover, the crosser were improved, and the optimization reserved strategy was used to accelerate the convergence without leading to premature.

对交叉算子进行改进，实施最优保留策略，加快了算法的收敛，并避免了早熟。

Three ways were first put forward to describe QoS preference information based on the theory of multiple-attribute decision,which were orders vector,AHP matrix and language valuation collection,and the concrete methods of conversion and computation were given out.

基于多属性决策理论，首先提出了QoS偏好信息的三种描述方式：序关系向量、AHP矩阵和语言评价集合，并给出了相应的转化和计算方法。随后，把QoS偏好的处理策略应用于服务选择，提出一个相对最优服务的确定方法，该方法可以反映用户的QoS偏好，满足用户按需服务的需求。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。