优值

First, the optimal approximating network is presented and the invariance property of the marginal distribution of some variables is studied.

首先解决了在Bayes网络中删除一条弧之后的最优近似网络中的参数赋值问题，并研究了最优近似网络中某些结点子集的边缘分布在近似以后所具有的不变性，给出了边缘分布保持不变的最大结点子集。

The so-called maximum principle is the necessary condition for an optimal control, one of the most principal and most commonly used approaches when facing a optimal control problem.

最大值原理，即最优控制满足的必要条件，是处理最优控制问题时最重要也是最常用的方法之一。

The single source and single sink network and the multiple sources and multiple sinks network are considered,respectively.We first construct an auxiliary network and convert the min-cost flow problem in origial network into the min-cost circulation problem in the auxilary network,and then find the optimal solution of min-cost circulation problem in the auxiliary network by using out-of-kiltem algorithm.

分别就单源单汇和多源多汇情况构造不同的辅助网络，将原网络中的最小费用流问题转化为辅助网络中的最小费用循环流问题，然后用瑕疵算法求最小费用循环流问题的最优解，这样在求出原网络中最小费用流的同时，也获得了总流量的最优取值。

Optimal consumption and investment ; stochastic volatility ; stochastic optimal control ; value function

最优消费和投资；随机方差；随机最优控制；值函数

By exploring the properties of the optimal value function, several simple and realistic sub-optimal policies are presented.These sub-optimal policies are of threshold structure, which are featured only by a number of threshold parameters.

分析了生产两种品种的纸机的最优策略的结构品质，提出了一种简易可行的次优控制策略：阈值控制策略。

In the study of open-loop optimal control problems, a useful tool is the so-called "Pontryagin"s Maximum Principle which gives a set of necessary conditions to optimal open-loop controls.

对于开环控制的研究，在最优控制理论中已经有了Pontryagin最大值原理这个有效的工具，它提供了最优开环控制的一个必要条件。

By means of the semigroup theory, spectrum theory, positive cone theory, integrated equation theory and optimal control theory, we obtain the existence of thresholds of these models, the existence and stability of the infection- free equilibrium and the endemic steady state, and the existence of optimal vaccination strategies, etc.

运用泛函分析中的半群理论、谱理论、正锥理论以及积分方程理论和最优控制理论，系统地研究了这些模型的阈值的存在性，无病平衡态和地方病平衡态的存在性和稳定性，最优接种疫苗策略的存在性等。

The parabola method is used in the process ef one dimensionoptimum solution of the coordinate transformation method.And also,difference coefficient proportionality is made use of jud...

在坐标轮换法的单维寻优中使用抛物线法，并且利用差商值之比判定框架梁、柱目标函数曲线的单调性，提高了寻优效率。

Based on the theory of analogy of structural mechanics and optimal control, the optimal induced norm γ-2 of state feedback H∞ control is shown to be the fundamental Rayleigh quotient eigen value in structural vibration or Euler stability problems.

文摘：根据结构力学与最优控制的模拟理论，指出状态反馈H∞控制黎卡提方程中的最优参数γ－2，实质上就是结构振动或稳定理论中的瑞利商最小本征值。

Viability Theory is applied to the optimal control problem for this class of hybrid dynamic time varying systems in this dissertation for the first time. And the statement about a characterization of the extended value functions as the unique lower semicontinuous solution to a Bensoussan-Lions type QVI is proved.

本文首次将生存理论应用到这一复杂系统的最优控制问题中来，得到了最优控制问题中的值函数是一类拟变分不等式唯一的下半连续解的重要结论。

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。