随机性

By use of the properties of ergodicity, randomicity, and regularity of chaos, a chaos genetic algorithm based float encoding is proposed to solve optimal operation of hydropower reservoir.

4利用混沌运动的遍历性、随机性和规律性等特点，提出了一种求解水电站水库优化调度问题的基于浮点数编码的混沌遗传算法。

Chaotic mappings have the features of initial-value sensitivity, ergodicity and randomicity, and are greatly fit for information encryption.

混沌映射具有初值敏感性、遍历性和伪随机性的特点，很适合用于信息加密。

It is found that adding the noise leads to an enhancement of excitability of the system.

若这些涨落或波动的强度足够大，就可以引起一系列的随机性兴奋，使系统从

It is of importance to capture the extreme value distribution of dynamic stochastic response of structures for reliability evaluation of engineering structures.

1引言 在工程实践中，结构的参数或激励往往具有很强的随机性，因而导致结构动力响应是一个随机过程，这使得有效地把握结构的动力反应特别是非线性动力反应和结构动力可靠度迄今为止仍是相当困难的课题t'，'〕。

The stress result conformed to the extreme value distribution, and it also manifested the randomicity of the stress produced by the wind load of tower under wind and ice storms.

得到的应力结果符合极值分布，同时也体现了塔设备在暴风雪下风载荷产生的应力的随机性。

Therefore in this paper the randomness of the FAC has been studied.

为此，本文针对失效评定曲线的随机性进行了研究。

This dissertation investigates the construction of pseudo-random sequences (pseudo-random numbers) from elliptic curves and mainly analyzes their cryptographic properties by using exponential sums over rational points along elliptic curves. The main results are as follows:(1) The uniform distribution of the elliptic curve linear congruential generator is discussed and the lower bound of its nonlinear complexity is given.(2) Two large families of binary sequences are constructed from elliptic curves. The well distribution measure and the correlation measure of order k of the resulting sequences are studied. The results indicate that they are "good" binary sequences which give a positive answer to a conjecture proposed by Goubin et al.(3) A kind of binary sequences from an elliptic curve and its twisted curves over a prime field F_p. The length of the sequences is 4p. The "1" and "0" occur almost the same times. The linear complexity is at least one-fourth the period.(4) The exponential sums over rational points along elliptic curves over ring Z_ are estimated and are used to estimate the well distribution measure and the correlation measure of order k of a family of binary sequences from elliptic curves over ring Z_.(5) The correlation of the elliptic curve power number generator is given. It is proved that the sequences produced by the elliptic curve quadratic generator are asymptotically uniformly distributed.(6) The uniform distribution of the elliptic curve subset sum generator is considered.(7) We apply the linear feedback shift register over elliptic curves to produce sequences with long periods. The distribution and the linear complexity of the resulting sequences are also considered.

本文研究利用椭圆曲线构造的伪随机序列，主要利用有限域上椭圆曲线有理点群的指数和估计讨论椭圆曲线序列的密码性质——分布、相关性、线性复杂度等，得到如下主要结果：(1)系统讨论椭圆曲线-线性同余序列的一致分布性质，即该类序列是渐近一致分布的，并给出了它的非线性复杂度下界；(2)讨论两类由椭圆曲线构造的二元序列的"良性"分布与高阶相关性(correlation of order κ)，这两类序列具有"优"的密码性质，也正面回答了Goubin等提出的公开问题；(3)利用椭圆曲线及其挠曲线构造一类二元序列，其周期为4p(其中椭圆曲线定义在有限域F_p上)，0-1分布基本平衡，线性复杂度至少为周期的四分之一；(4)讨论了剩余类环Z_上的椭圆曲线的有理点的分布估计，并用于分析一类由剩余类环Z_上椭圆曲线构造的二元序列的伪随机性；(5)讨论椭圆曲线-幂生成器序列的相关性及椭圆曲线-二次生成器序列的一致分布；(6)讨论椭圆曲线-子集和序列的一致分布；(7)讨论椭圆曲线上的线性反馈移位寄存器序列的分布，线性复杂度等性质。

This paper analyzes the influence of the probability of line fault position and the transition resistance to the power system security measure .

研究了输电线路的故障地点和故障过渡电阻的随机性对电力系统动态安全性测度的影响。

At foundation of forefathers work, this dissertation goes on the preliminary discussion in conformity with the field of forces of grain and moving rules caused by size of outlet, main research work is as follows: 1 The dissertation analyses the randomness of individual grain and rules as a whole.

在前人工作的基础上，本文就放出口对散体移动规律的影响和散体流动应力场进行了初步的探讨，主要的研究工作如下： 1 分析了单个散体颗粒运动的随机性和整体表现出来的规律性，证明了底部放矿时颗粒在水平方向沿x轴与y轴的移动概率具有独立性。

On the base of finite element analysis and testing on the bearing capacity, set up reliability evaluate model based on the bearing capacity of the bridge-crane structure. The model fully considers the random of the factors that affect the bearing capacity, and evaluate the bearing capacity in certain evaluate norms.

在有限元分析和承载能力测试的基础上，建立了基于常规可靠性理论的桥架结构承载能力可靠性评估模型，充分考虑影响桥架承载能力因素的随机性，按可靠性模型进行桥架承载能力可靠性指标计算，然后按评判准则进行承载能力评估，达到了量化评估的目的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。