查询词典 problem

The basic idea was to discrete the structure and find the load function according to the energy criterion of buckling and the principle of random displacement method. As the critical load is the minimum of the load function, a problem of frame buckling can be transformed into an optimization problem. Therefore, the critical load can be found through solving the optimization problem.

先将结构离散为一个有限自由度系统；然后根据有限自由度系统平衡稳定性的能量准则和随机位移法的基本原理，建立符合能量准则的载荷函数，该函数不为零的最小值即为临界载荷，由此将稳定问题转化为无约束的多维优化问题；最后应用遗传算法求出相应于最优解的目标函数值。

The quasi-phsical method makes the original problem an optimization problem in mathematics. There is often the possibility of going to a local minimum of object function when solving the optimization problem mathematically.

所谓拟物就是主动地向自然界学习解决问题的方法，即寻找与原始数学问题等价的物理世界并观察这个世界中物质运动的生动形象，然后从中得出启发并逐步形式化为算法以求解问题。

In the algorithm, radial-basis function neural network was utilized as forward model, and genetic algorithm was used to solve the optimization problem in the inverse problem, which can avoid the local minimum solution possibly encountered in the iterative inverse algorithm based on gradient descent and consequently achieve the global optimized solution of the inverse problem.

在该算法中，径向基函数神经网络用作前向模型，遗传算法用于求解逆问题中的优化问题，其优点是能够避免基于梯度下降法的迭代逆算法中可能遇到的局部最小问题，并能得到逆问题的全局最优解。

Based on the fundamental principles of the improved method mentioned above, multi-functional computation software package, which can be used to analyze effectively the interference effects of random flaws in plane problem, boundary problem and space problem, is compiled and a number of problems involved in the interference effects of different kinds of flaws such as random equal length through-cracks, random branched throughcracks, random unequal length through-cracks, random holes to through-cracks, unequal length edge cracks, equal length and distance multiple edge cracks, random notches with different aspect ratio, random notch to edge crack, non-coplanar surface cracks with different aspect ratio, staggered surface cracks, surface crack to embedded crack and embedded cracks near free boundary are analyzed and computed by the package.

依据上述改进法的基本原理，本文编制了能有效地分析平面问题，边界问题及空间问题的任意缺陷群相互干涉效应的多功能计算软件包。据此，本文分析计算了各类缺陷群。诸如，任意等长裂纹群。任意折裂纹群；任意不等长裂纹群，任意孔与裂纹群，不等长边裂纹群。等长等间距多裂纹群，任意形状比缺口群，任意缺口与边裂纹，非共面不同形状比表面裂纹群，交错型表面裂纹群，表面裂纹与埋藏裂纹群及自由边界附近埋藏裂纹群等的相互干涉效应问题。

Delay constrained multicast problem is an important part of multipoint routing optimization problem and has been proved to be a NP-Complete problem.

有时延约束的组播问题是通信网络多点路由优化问题中的重要部分，已被证明是NP complete问题。

How to provide route to meet the driver's multiple psychological expectations is the key problem of navigation system. The essence of this problem is resource constrained shortest path problem, which belongs to NP-C problems and can not be solved with the traditional shortest path algorithm.

提供满足驾驶员多个心理期望的路径是导航系统该解决的关键问题，其本质是资源约束最短路径问题，属于NP难问题，无法使用传统的最短路径算法解决。

The circulation problem and the generalized circulation problem cover the whole field of the flow analysis about the generalized network flow problem.

环流问题和一般环流问题构成了一般网络流量分析问题。

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。

Von Neumann proposed that a problem be broken into discrete logical steps, much like the steps in a long division problem, and that intermediate values in the task be stored temporarily in the computer in such a way that those values could be considered input for the next portion of the problem.

冯诺依曼建议，将问题分解为分立的合乎逻辑的阶段，很像一个长期分离的问题，把工作中的中间值临时储存在计算机中，这样一来，那些数值可以被看成是为下一部分问题输入的数据。

This is no longer a Niger Delta problem, nor a Nigerian problem but a global problem.

这已经不再是尼日尔三角洲的问题，也不是尼日利亚的问题了，而是全球性问题。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。