查询词典 optimal

We show that the value function satisfies a free_boundary problem, prove the existence of the optimal policy by variational equation and get the optimal policy.

给出了价值函数满足的自由边界，用求解变分方程的方法证明了最优控制的存在性，并找到了最优控制策略。

This dissertation is mainly concerning digital image watermarking problems. In Chapter 2, a detailed survey on digital image watermarking is presented. In Chapter 3, an optimal scheme is proposed to use Human Visual System model to compute masking function. It will be used to control the strength of watermark signal for optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vector quantization.

本文讨论了数字图像水印及其在多媒体安全中的应用，主要围绕下列问题进行研究和创新： 1、优化的水印嵌入模型：本文对基于直接序列扩频技术的水印算法进行了改进，根据人类视觉系统感知模型，提出了优化的水印嵌入模型，在不可感知性条件的限制下，使水印的鲁棒性达到最高。

In Chapter 2, a detailed survey on digital image watermarking is presented. InChapter 3, an optimal scheme is proposed to use Human Visual System model tocompute masking function. It will be used to control the strength of watermark signalfor optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vectorquantization. Some important transform coefficients of the original image are firstlymapped into the nearest neighboring lattice points by using lattice vector quantizer,then watermark signal is added to the lattice points.

本文讨论了数字图像水印及其在多媒体安全中的应用，主要围绕下列问题进行研究和创新：1、优化的水印嵌入模型：本文对基于直接序列扩频技术的水印算法进行了改进，根据人类视觉系统感知模型，提出了优化的水印嵌入模型，在不可感知性条件的限制下，使水印的鲁棒性达到最高。2、基于格矢量量化的图像水印：本文提出了基于格矢量量化的多比特盲水印算法，不需要原始图象就可以实现水印信号的检测和译码。

In order to do this, the width of narrow annuli cooling channel of beryllium beam pipe was designed by optimization method, the theoretical analysis and finite element method were used, then the optimal width was chosen, the influence of concentrated heat on the temperature of inner and outer wall was studied, and the optimal working velocity of cooling fluid was given.

本文结合理论分析和有限元数值模拟对束流铍管的冷却环形窄通道尺寸进行优化设计，确定了窄通道最佳间隙，研究了集中热负荷对内外壁温度场的影响，并确定了冷却液最佳工作流速。

In this paper, a path planning method based on GA is presented. Firstly, the model of the space robot is built to display the mapping of the end velocity and the joint velocity. Then the optimal algorithm based on genetic algorithm is presented to search the optimal solution which minimizes the disturbance of base attitude in the feasible solution space. Finally, an illustrative example is used to verify the feasibility of the algorithm.

基于GA研究机械臂运动对基座的姿态扰动问题，首先，建立空间机器人的运动学模型及空间机器人末端与关节速度之间的映射关系；接着，应用GA作为最优化算法，在空间机器人可行解空间中，寻找最优解得到最优路径，以达到对基座姿态干扰最小的目的；最后，通过数值仿真实验验证算法的实用性。

The theoretical model of uniform droplet spray process had been established in this thesis. The calculation method for theoretical value of jet velocity and optimal frequency had been developed. Therefore the theoretical value and regularity of jet velocity and optimal frequency under different spray pressure were obtained, so the theoretical prediction for spray result had been realized. This not only offers comparison parameter for simulation results, but also will guide the proper determination of process parameters.

本文建立了均匀液滴喷射过程的理论模型，导出了射流速度和最优频率的理论值计算方法，从而得出了不同喷射压强下的射流速度和最优频率的理论值及所存在的规律，实现了对喷射结果的理论预测，不但为模拟结果提供了对比参数，而且对于合理选取工艺参数具有指导意义。

In CRS gather method, we derived the quantitative relationship between optimal three parameter and migration velocity field, and then put forward ray-tracing method to get migration velocity field using optimal three parameter in CRS stack. The applications proved its effectiveness and adaptability.

在CRS道集偏移速度建模中，推导了优化三参数与偏移速度场之间的定量关系，提出了利用CRS叠加中的优化三参数求取偏移速度场的射线追踪法，模型试算表明了方法的有效性和适应性。

It is presented that the optimal scheme of the structure parameters of the heat pipe waste heat boiler and the step of the optimal algorithm is discussed.

目前，热管式余热锅炉已在多种余热回收中广泛应用，达到了回收余热、节能降耗的目的，取得了十分显著的经济效益[1]。

The method employs characteristic values such as hinge node voltage at dividing place between the large district grid and the provincial grid and tie line reactive power and so on as a coordinated variable of wattless control of the large district grid and the provincial grid, and real-timely calculates an optimal set value of the coordinated variable in the large district grid which is sent down to the provincial grid via wide area communication. In the coordinated control of the provincial grid, the method can not only realize the control object of original grid, but can also realtimely track the optimal set value of the coordinated variable given by the large district grid.

本方法选择大区电网与省级电网分界处枢纽节点电压和联络线无功等特征量作为大区电网与省级电网无功控制的协调变量，通过大区电网的无功优化，实时计算出大区电网中协调变量的最优设定值，该设定值通过广域通信下发到省级电网，在省级电网的协调控制中，除了满足本级电网的控制目标外，还实时跟踪由大区电网给出的协调变量的最优设定值。

Results showed that optimal selection achieved greater selection response than either standard QTL or regular BLUP selections. The influence of economic weight to optimal selection was significant, and the optimization was better as the economic weight of D100 increased.

经济权重对优化选择的影响较明显，随着达100 kg日龄赋予的经济权重的增加，优化选择的优势越明显。

Looking to bounce back from defeat against Cesena last weekend, the Calabrian boss will be sticking to his tried and tested 4-3-3, with Lopez and Sedivic joined up front in Giampaolo's absence by either Nanni or Plasmati.

鉴于上周末对切塞纳的比赛中反败为胜，这支南方球队将会更坚持其一贯而有效的4-3-3阵型，洛佩斯和塞德维奇将取代受伤缺席的詹保罗，和纳尼或者帕斯马蒂中的一个搭档锋线。

Meanwhile, their exposure to the more freewheeling ways of the West broadened dramatically.

另外，西方较自由的生活方式对年轻人的影响增大。