查询词典 stochastic

In financial mathematics, a series of stock prices is regarded as a sample path of stochastic process. Thus the realization of these stock prices is only an event with zero probability.

本文证明了股票市场中，技术分析指标可以从现有的股价模型(例如Black-Scholes模型、随机波动率模型)出发，用平稳过程的理论加以解释。

Stochastic processes of pit generation on zirconium with an anodic oxide film .

磁场和Cl~-作用下硫酸溶液中铁的恒电位电流振荡。

This paper proposed an adaptively stochastic algorithm for solving a log-optimal portfolio problem with risk control.

针对有风险控制的log-最优投资组合问题，提出了一个自适应的随机演算法。

Firstly, soil aspect, the non- balanced time series model for forecasting soil aquiferous capacity is built up by stochastic theory, and the BP network model is set up by MATLAB artificial neural network tool, the forecasting result is very good.

第一，关于土壤方面，利用随机理论建立了预测土壤含水量的非平稳时序模型，同时运用MATLAB人工神经网络工具箱建立了土壤含水量预测的BP网络模型，取得了较为满意的效果。

Full-term pregnancy of primipara 120 cases of illness; Stochastic double divides into three groups: research of group-A group and B group. control group of C group, A group (n=40), 0.75% levobupivacaine 10mg for CSEA, B group (n=40), 3% chloroprocaine the hard membrane pericoel hinders, C group: 0.75% bupivacaine for under the arachnoidea the cavity hinders the anaesthesia, In surgery process, to A and B groups, 2% lidocaine were intermittently injected respective-ly by epidural cathete, effec not enough of anesthesia.

足月初产妇120例随机双盲分成三组：研究组为A组和B组，对照组为c组。A组(n=40)蛛网膜下腔阻滞麻醉用药为0.75%左旋布比卡因10mg，使用腰麻硬膜外联合阻滞行剖宫产术，B组(n=40)以3％氯普鲁卡因为硬膜外麻醉的局麻药，使用硬膜外麻醉阻滞行剖宫产术，c组(n=40)腰麻用药为0.75%布比卡因10mg，使用腰麻硬膜外联合阻滞行剖宫产术。

The paper is organized as follows. In chapter 2, we introduce some concepts about SEA, the abstract SEA model and the convergence definition of algorithm. In chapter 3, we describe firstly the evolution of PMA as an abstract stochastic process, and by characterizing axiomatically the properties of the fundamental selection and evolution operators, we conclude that PMA is essentially a kind of SEA.

本文结构安排如下：第二章介绍了模拟进化算法的一些基本概念、形式化随机过程描述以及收敛性定义；第三章对改进后的 PMA 各操作作了抽象定义，得到了 PMA 的形式化随机过程描述，并公理化地证明了各操作算子为选择或繁殖算子，从而得出 PMA本质上也是一种模拟进化算法；第四章先对选择算子特征数定义作了适当改进，并通过各进化算子的具体特征数指出，如果 PMA 不采取任何执行策略时，算法本身并不收敛。

Port vessel berthing system is a stochastic multi-level queuing system which is very complex and dynamic.

港口船舶航行作业系统是一个随机因素多、动态联系复杂多级排队的随机服务系统。

3D stochastic geological model is built under the control of microfacies model. The spatial distribution of property and calcicolous intercalation are determined.

通过相控随机建模建立研究区三维地质模型，确定了储层物性及钙质夹层的空间分布。

The concept of comparison with probability was also introduced based on NDPSO, and then the stochastic repairing operator was constructed for heuristic search to solve the Winner Determination Problem in combinatory auction.

在NDPSO算法的基础上引入依概率随机比较的概念，并构造了进行启发式搜索的随机修补算子，实现对组合拍卖中的竞胜标确定问题的求解。

The results demonstrate that the stochastic factor of ion channels may be beneficial for information processing in auditory system, the mechanism of which need further discuss.On the other hand, we study on the response characteristics of bushy cell, which is composed of a dendrite, a soma and an axon, with compartmental model of bushy cell.

结果表明，树突和轴突的尺寸会影响信息的传输速度，从而影响信息在神经元间传递的时机；胞体部分是整个神经元响应的核心单元，决定了信息是否能被传递到轴突末端；轴突的主要作用是对胞体的发放响应进行优化，使得轴突末端的发放形式更有利于信息传往下一级神经元。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。