离散群

A discrete particle swarm optimization algorithm is presented to tackle the quadratic assignment problem.

摘要提出了一种求解二次分配问题的离散粒子群优化算法。

A discrete particle swarm optimization algorithm for the collusion problem is also presented based on the optimization model proposed.

在此基础上，提出了基于离散粒子群算法的无线传感器网络共谋问题优化方法。

In this paper,a new routing approach based on discrete particle swarm optimization algorithm is briefly discussed to obtain the optimum path between two nodes in the network.

针对不同的网络实际条件，提出一种改进的离散粒子群算法来寻找网络中任意两个节点间的最优路由。

In 1998, Lee and Chang proposed a group signature scheme based on the discrete logarithm problem.

1998年，L ee和 Chang提出一种基于离散对数问题的群签名方案。

Three solution algorithms for classical transportation continuous/discrete/ mixed network design problems are designed based on particle swarm optimization approach, in which the continuous NDP is studied in detail, discrete and mixed NDP are only described the frameworks of the solution algorithms.2. Generally, road capacity constraints must be added to the lower level problem of classical discrete NDPs bilevel programming model in order to avoid traffic assignment on candidate roads.

本论文研究工作主要有如下几个方面：(1)基于粒子群优化思想设计了求解传统的城市道路交通网络设计问题的算法，其中详细研究了连续网络设计问题，并用两个网络例子进行了数值实验；并给出了离散网络设计问题和混合网络设计问题的求解算法思路和主要步骤。

In 1976 Jorgensen established a fundamental theorem of Mobiusgroup in plane---criterion of discreteness.

Jorfensen在1976年建立了Mobius群的基本定理——离散性准则。

Elliptic curves discrete logarithm ; elliptic curve domain parameter ; point group ; base point ; quadratic remainder ; quadratic congruence equation

椭圆曲线离散对数；椭圆曲线域参数；点群；基点；平方剩余；二次同余方程

The GKS stability theorem for one-dimensional model of hyperbolic initial and boundary value problem, Trefethen's explanation and extension based on the concept of group velocity are generalized firstly. Another possible high-frequency instability mechanism in numerical realization of MTF is pointed out based on his explanation and extension, namely, coupling effect of outgoing harmonic wave along one direction and node motion in the other directions can reverse the energy propagation in multi-dimensional discrete grids.

本文概述了—维双曲型偏微分方程组初边值问题数值稳定性的GKS定理及Trefethen基于群速度概念对这一定理的解释和推广；并应用Trefethen的解释和推广指出了MTF在数值实现中可能出现的另一种高频失稳机制，即在多维离散网格中，沿某一空间方向的外行简谐波，由于与其他空间方向节点运动的耦合效应可以使能量传播方向反向。

In order to satisfy itself to as well as enriches my knowledge with the contemporary science hope, I have not only studied the machine science core curriculum like mechanics, the metal, the process and the material, but also through was the audit method has studied the other curriculum like discrete mathematics, the advanced algebra, the group theory in other and so on.

为了满足自己对与当代科学的渴望以及丰富我的知识，我不仅学习了机械科学的基础课程如机械学、金属、过程与材料，还通过在其他系旁听的方法学习了其他课程如离散数学、高等代数、群论等。

The security of the dynamic group signature is based on the fact that the gap Diffie Hellman problem and discrete logarithm problem are hard problems.

该方案的安全性是建立在间隙群上计算Diffie-Hellaman问题和离散对数问题均是困难问题的基础上。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。