随机函数

A class of stationary models of singular stochastic control is discussed, in which the functions in cost structure are n ot restricted to even functions, and the state processes are diffusions with "n onsymmetric" drift and diffusion coefficients.

该文讨论了一类奇异型随机控制的平稳模型，其费用结构中的函数不限于偶函数，其状态过程为扩散型且具有&非对称的&漂移及扩散系数。

Fourthly, the concentration processes for liquid membrane separation are studied. The feed tank levels are difficult to be tracked efficiently in the random-rinsing and continuous-discharging nanofiltration process.The tracking control of feed tank levels is improved by the selective control and the transparent predictive functional control.

针对液体膜分离浓缩过程采用纳滤随机清洗连续排料操作方式时原料罐液位的不能有效跟踪控制问题，提出了原料罐液位的选择性控制及以预测函数控制PFC为监督层、常规PID为控制层的透明控制结构，实现了以常规PID为基础控制、PFC为设定值给定的原料罐液位的跟踪控制。

The probability density function of non-following headway and formulations of random variables of two kins of traffic flows are deduced.

本文以爱尔朗分布为基础，将高速公路上车辆分为队状跟车和非跟车两种类型交通流，用大量实地观测数据检验分布的特性，推导出非跟车流车头间隔的概率分布函数和仿真用的两种交通流的随机变量公式。

From the analysis of automobile vibration sources and the human responses to vibration, a mechanic model of man-chair-vehicle system with 13 degrees of freedom is built by vibration pattern analyzing technology. Using the random vibration theory, the calculating methods are developed for parameters, including vibration pattern, transfer function, wheel transient load, and acceleration of seat, automobile ride quality simulation software is developed.

通过分析汽车振动源和人体对振动的反应，用模态综合技术，建立了十三自由度人－椅－车系统的动力学模型，运用随机振动理论，给出了振动形态、传递函数、悬架动挠度、车轮动载荷、座椅加速度等参量的计算方法，开发了一套&汽车平顺性仿真软件&并利用已有的汽车数据，对汽车行驶时的振动特性进行了仿真，得到了重要结论：发动机与轮胎刚度、阻尼，后桥阻尼对驾驶员座椅处的振动影响不大；驾驶员座椅的垂直刚度增加很大时，对垂直方向振动响应比较大；前桥刚度、阻尼对驾驶员座椅处的振动影响较大；前轮胎刚度对前桥振动影响较大，前轮胎刚度增加，则振动加强；后桥刚度对汽车平顺性有一定影响，后桥刚度减小，则座椅处垂直加速度减小。

Several problems, such as calculation of vargiom and model selection resulted from sparse well and lack of production data, are analyzed, and resolvents are presented.

针对勘探阶段油藏钻井少、生产数据缺乏的实际情况，对储层随机模拟过程中出现的问题，如变异函数求取、模型的筛选等，进行了初步的分析，并提出了相应的解决方法。

Influences of the conditions, such as seed value of randomizer, the form parameter of statistical distributing function m, cell number, stress strain state, if there are weak areas in the center of specimens, limit conditions, random evaluating method of material factor on the elastic-plastic failure process of rock specimen are discussed.

分别研究随机数发生器种子值、统计分布函数的形态参数m、单元数目、应力应变状态、试样中心有无弱区、边界条件、材料参数随机赋值方式等条件对岩石试样弹塑性破裂过程的影响。

School Education ; School Quality ; Wage Function ; Stochastic Frontier

中文关键字学校教育；学校品质；学生表现；工资函数；随机边界法

According to the fractal dimension, the disturbed distance between upper and lower fracture surfaces and the ratio of area contact (the proportion of contact area to whole area of fracture) of fracture, the random Brown Function is used to generate a rough-walled fracture with position-dependent aperture.

根据裂隙面分形维数、裂隙面位错值和裂隙面上的面积接触率，用随机布朗函数生成裂隙的开度分布。

To overcome target expansion, shape transformation and occas ional frame lost due to the missile phase motion of television guided bombs , a modified weightˉrelated function, t arget tracking strategy, template updating and modifiˉ cation, and tracking point positioning method as well as a predict ion method to solve the frame loss of target were proˉ posed. Based on this, an improved weightˉrelated matching tracking a lgorithm was realized.

针对电视制导炸弹中弹目相对运动变化而导致的目标尺度变化、几何形变以及随机因素造成的暂短丢帧现象，文中对相关测度函数进行了基于弹-目距离的中心加权修正，提出了相应的模板更新与修正策略、基于线性预测的目标位置的预测方法、跟踪点的定位方法等，在此基础上，实现了基于加权相关的图像匹配跟踪算法。

It is good consistent with the result of simulation. The first-passage reliability functions of structure with stochastic initial deflections are derived.

在计算结构受宽带载荷作用下的可靠性中，定义结构存在随机初始缺陷时的首次超越的可靠性函数。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。