查询词典 descent method

Based on this, this paper develops the modal series method, expounds its mathematic foundation and theory system, and compares it with the linear modal analysis and the method of norm form of vector fields.

开发了基于模态级数法的HVDC/AC互联电力系统分析软件包，通过此软件可以得到系统的非线性响应，获得非线性系统零输入响应的近似闭式解，进行系统模态分析、非线性模态交互作用分析，并为控制系统设计提供有价值的特征信息。

At the same time, the time taken to solve the system of normal equations for the least-square method is also reduced by using matrix updating techniques associated with Broydens quasi -Newton method.

同时运用拟牛顿矩阵校正技术解最小二乘方程组也减少了大量的计算时间。

For the LS problem, the method of normal equations needs less computation but its computed solution has poor accuracy. If QR factorization is used, more accurate solution can be got. However, its computation is nearly as twice as the method of normal equations.

对于线性最小二乘问题，混合方法的提出是企图在法方程法与QR分解方法之间取得某种平衡，希望能够节省计算量又同时保持计算解达到较高精度，但后者在理论上并未得到证明。

At present,the hybridization of Differential Evolution with local search method confines to DE with a crossover based local search method.A novel differential evolution algorithm with best-individual based Local Search strategy is proposed.In LSDE,a normal distribution operator is introduced to automatically modify search length,and time-varying factors are introduced to modify the two parameters of DE.

针对目前差分进化与局部搜索相结合仅局限于基于交叉的局部搜索的方法，提出了一种基于最佳个体局部搜索策略的差分进化算法，并引入正态分布算子自动调整搜索步长和时变差分进化因子调整DE的两个参数。

The validity of two non-linear analysis methods for low frequency oscillation in power systems, i.e. normal form method and modal series method, are analyzed and compared from many aspects in this dissertation.

本文从多方面分析比较了电力系统低频振荡的正规形法和模态级数法这两种非线性模式分析法的有效性。

In the meantime, a new relation between the coefficient of variation for a normal variate and its sample size is achieved, where the probability to make mistake Ⅱ is considered 5 The probability distribution of fatigue strength at given life under large sample size determined by a new method is found to follow the log-normal distribution and normal distribution, and a new method are developed to estimate the characteristic parameters of probability distribution of fatigue strength from the probability distribution of traditional tensile properties.

根据P-S-N曲线的要求，采用概率统计方法，导出了考虑犯Ⅱ类错误的概率时获取给定精度P-S-N曲线所需的最少子样容量，引入了不同方法获取的P-S-N曲线结果是否趋同的判别标准，得到了P-S-N曲线的寿命求解法和系数求解法获得趋同结果的条件。 5）研究了大子样条件下指定寿命时疲劳强度的概率分布，并提出了根据拉伸性能的分布估算材料疲劳强度概率分布参数的一种方法。

In the design and implementation of the database applications part,this paper introduces a method of progressive expansion to design concept structure of the database, and put forward the "pseudo-code" to solve the existing problem in modification complexity and large data redundancy after using the traditional method of normalization theorem to process the database.

在该系统数据库设计与实现部分，本文介绍了运用逐步扩张的方法设计本数据库概念结构过程，并提出了"伪码"的概念以解决利用传统规范化理论处理后数据库存在的修改复杂、数据冗余度大的问题。

Each method can be used in conjunction with normalization method.

每种方法还可以结合使用"归一化"的方法。

This method, based on the normalized cross-correlation function, is the modified Speckle Pattern Correlation method in the application of the digital image processing technique to the speckle pattern metrology.

该法实质上是借助数字图像处理技术，通过物体位移前后二个散斑场之间的相关性来进行位移测量方法的发展。

The theory of north finding is first introduced, and the measuring method of north azimuth is brought forward according to a fast north finding theory based on analysis method; the hardware structure of northing finding system is introduced too, which provides the theory basis and hardware environment for north finding system software design.

文中首先介绍了寻北系统的工作原理，根据基于解析方法的快速寻北原理，提出了北向方位角的测量方法；介绍了寻北系统硬件平台的构成，为寻北系统软件设计提供了相关理论基础和硬件环境。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。