最优步长

Spectral methods and the classical Crank-Nicolson scheme are applied to deduce the full discrete system for the continuous model, then the variational adjoint assimilation approach is used to derive the gradient and the corresponding adjoint system.

从这个全离散问题出发，结合全局或局部已知的观测数据，分别构造梯度下降算法求解相应的最优化问题。我们分析了采用不同方法计算梯度所需的代价，另外，还给出一种选择最优迭代步长的算法。

The simulation results show that this scheme can realize the global optimization of the MEA algorithm and can avoid the selection and adjustment of parameters such as iteration step lengths, threshold values, etc.

仿真结果表明，该算法不仅实现了MEA算法的全局最优求解，还可避免步长、间值等参数的选择与调整。

Presented a mathematic model for the algorithm and proved its convergence characteristic, this image reconstruction algorithm made the iteration step was optimal on the premise of convergence.

给出了算法的数学模型，完成了算法的收敛性分析和证明，算法在图像重建中使迭代步长在保证收敛的情况下达到最优。

The same way can be used to find the value of n in the method of multi-time moving average.

用同样的方法可以寻找2次或更多次移动平均法中的最优移动步长n。

The same way can be used to find the value of n in themethod of multi-time moving average.

用同样的方法可以寻找2次或更多次移动平均法中的最优移动步长n。

By use of first-order linear expansion of Taylor series, the linearization process of both nonlinear constraints and objective function of long-term optimal scheduling model are performed and an optimal scheduling model based on seccessive linear programming is built; an approach to solve Optimal scheduling of cascade hydropower station problem by seccessive linear programming is put forward, the scale-down factor of iteration step length is used to ensure that the algorithm can converge to the optimal solution of optimization problem quickly and accurately.

通过采用泰勒级数一阶描述形式，对优化调度目标函数和约束条件中的非线性约束进行线性化处理，建立了基于连续线性规划算法的优化调度数学模型，提出了用连续线性规划技术求解梯级水电站优化调度问题的算法，并采用迭代步长的动态比例缩减因子保证算法能快速准确地收敛到优化问题的最优解。

On the basis of ideas of 3D-structure arithmetic model and resolvents, a concrete quasiphysical and anthropopathic algorithm is formulated.

并设计了变步长梯度下降法来求局部最优格局和拟人跳坑策略来求全局最优格局。

This article puts forward algorithm of a kind of improvement man-made shoal of fish, in forage man-made fish lets direct move in behavior relatively actor position, in order to accelerate algorithmic search rate, trends adjusts the eye shot of man-made fish and pace to grow, make its maintain maximum in algorithmic moving initial stage, and gradually by big decrescent.

该文提出一种改进的人工鱼群算法，在觅食行为中让人工鱼直接移动到较优位置，以加快算法的搜索速度，动态调整人工鱼的视野和步长，使其在算法运行初期保持最大值，并逐渐由大变小。

For the Hopfield network in solving the traveling salesman problem offen getting unvalid and not optimal solution, this paper introduced a suitable radom initialization of the output values Vxi of permutation matrix to guarantee an effective solution, used the error produced by taking a larger step size and required new solution to be better than or equal to old solution so that the final result can jump out local minima to find the global optimal solution.

摘 要：针对Hopfield网络解旅行商问题经常出现无效解和局部优化解，本文给出置换矩阵的满足一定条件的元素Vxi作为初始值，以便得到有效解。此外，还利用较大的步长所产生的误差和对当前解必须优于或等于已有解的要求，使计算结果能从局部优化解达到全局最优解。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。