Vega Prime集成运行环境设计

Vega Prime集成运行环境解决了基于Vega Prime开发程序独立运行的难题,分析了无VP环境运行程序存在的问题和运行环境需要的模拟license和运行数据,提出了Vega Prime集成运行环境由集成运行环境引擎和集成运行环境Shell组成,并具体实现了集成运行环境。     

浅议变电站变电运行管理措施

随着我国科技水平的不断提高和经济水平的不断发展,使变电站变电运行的设备和规模都有了一定程度的变化,变电运行的主要作用是电力设备的维护管理和运行操作,变电运行是电网运行的基础,只有做好变电运行电网才可以得到安全稳定的发展。为了符合变电运行变化的要求应对传统的变电运行管理方式进行改革和优化,保证电网的安全稳定运行。本文对变电站倒闸的管理措施和操作管理规定进行了分析,总结了变电站运行管理的要求,对变电站变电运行的安全管理、运行模式、运行中存在的问题进行了探讨。     

220kv变电运行故障及其排除分析

220kV变电运行的主要工作是电力设备的维护管理和运行操作,在变电运行过程中,需要维护的电力设备较多,变电运行发生故障和出现异常的机率很大。为了保障220kV变电运行的安全稳定性,必须要针对220kV变电运行故障,积极采取有效措手,做好故障的排除工作,保障我国电力系统的正常运行。本文分析了220kV变电运行的设备检修,阐述了220kV变电运行的故障分析和排除策略。     

采用策略的IP网络运行质量评估方法实现

针对目前IP网络运行质量评估的需求和评估中存在的灵活性和可扩展性问题,提出IP网络运行质量指标体系和采用策略的网络运行质量评估模型.给出了网络运行质量评估流程,制定了网络运行质量评估信息模型.采用B/S结构开发了评估原型系统,将模糊综合评估方法应用于运行质量评估并给出了其伪代码.原型系统运行结果表明该系统能够实现高效、自动、定量和可扩展的网络运行质量评估.     

变频器的控制功能第5讲变频器的运行方式

变频器的运行方式是指变频器应该选择如何负载的工作方式。普通运行,是最常用的运行方式,它是在变频器最初设置的频率给定方式和运转指令方式下的运行方式。点动运行,就是变频器在停机状态时,接到点动运转指令后按点动频率和点动加减速时间运行。多段速运行,是指通过多功能输入端子的逻辑组合,可以选择多段频率进行多段速运行。另外本文还阐述了PID运行和简易程序运行。     

基于BP神经网络的信息系统运行质量评价模型

信息系统运行质量评价是供电企业信息系统运维的重要工作,其中关键的一项就是对信息系统运行质量进行分析评估,这对于信息系统运行可靠具有重要意义。在分析影响信息系统运行质量因素的基础上,构建了信息系统运行质量评价指标体系,将遗传算法神经网络原理引入信息系统运行质量评价,构建了基于遗传算法和神经网络的信息系统运行质量评价模型,为供电企业的信息系统运行质量评估研究提供模型和方法的支撑。实证结果表明:模型具有较强的自组织、自学习和自适应能力,模型评估结果比较客观合理。     

SMT产品制造网格组织与运行模式的研究

在分析SMT-MG宏观组织模式基础上,深入研究面向资源节点微观组织模式,讨论了SMT-MG的运行基础、运行过程、运行环境和运行目标,最后给出了SMT-MG运行实例。     

分布仿真运维管理系统运行监控工具研究与实现

运维管理系统是支撑分布式仿真系统部署、运行和评价的工具集。运行监控工具是该系统实现仿真节点管理、运行过程控制、运行结果反馈和运行效能评价的关键环节。介绍运维管理系统的结构与组成,并指出运行监控工具在其中的作用;基于它的实现原理和功能需求提出设计思路;阐述运行监控工具的结构组成,并对节点管理、辅助分析、命令管理和状态监控等组件工作机制和设计实现方法进行详细的分析;总结运行监控工具的特点及应用前景。     

基于.NET公交运行计划图的实现

介绍了公交运行计划图,对其基本算法进行了描述,包括坐标系转换算法和运行计划图绘制算法,通过.NET平台进行实现。介绍了运行计划图定义的类,并以一个类为例说明类的属性和方法,详细说明了运行计划图各种操作的实现,包括运行线图元的增加、删除、拖动和线上点位置的移动,以及图形的序列化,并能实现撤销或重做。程序运行结果表明,该运行计划图比表格式运行计划更能满足实际需要。     

基于HLA的分布仿真系统运行全过程管理

分布仿真系统运行管理是应用仿真系统的重要环节,运行管理工具是重要的仿真系统支撑工具。现有的工具都是基于MOM,单纯对运行过程的管理工具,不能满足实际中对运行全过程管理的需求。文章总结并扩展了运行期间的关键管理技术,将其扩展到对运行全过程的管理,并将运行全过程分为运行前后的调度准备、运行过程的基于MOM的管理和对系统的负载监控及调度。文章对每部分的需求、内容和关键技术进行了分析,最后给出了实现方案。     

OWA aggregation of intuitionistic fuzzy sets

We recall the concept of an intuitionistic fuzzy subset (IFS). Fundamental to an IFS is the fact that it is defined using two values, a degree of membership and degree of non-membership. The ordered weighted averaging (OWA) operator is introduced and several of its features are described. Particularly notable is the idea of the dual of an OWA operator. We next discuss the aggregation of a collection of IFS using a prescribed OWA operator. It is shown that while the aggregation of the degrees of membership is performed using the prescribed OWA operator, the aggregation of the degrees of non-membership requires use of the dual of the prescribed OWA operator. The Choquet integral aggregation operator is introduced and applied to the aggregation of IFSs. Here again the concept of the dual is needed to perform the aggregation of the degrees of non-membership. We also discuss the aggregation of IFSs using the Sugeno integral. Fundamental to this work is our realisation of the importance of the concept of the dual operators in dealing with the aggregation of IFS.     

Computer simulation studies of recombination of ions in multi ion-pair ensembles—I. Diffusion-controlled processes

The problem of the diffusion-controlled recombination of ions for the case in which initially two or more non-separable pairs of oppositely charged ions are present in the system is treated by means of a computer simulation method.In the first part of the project, the calculations were performed for the media with the short mean free path of the free movement of ions between scattering events, i.e. for the conditions of the diffusion model of the ion transport. The movement of an ion is simulated by a superposition of random walk and drift in the electric field of all the other ions in the system. Thus, the calculations belong to the class of stochastic dynamics methods.The simulations assumed the partition of an ion ensemble into small independent clusters of up to ten ion pairs. Results were obtained on the probability of ion survival as a function of time and the probability of ion escape from recombination at infinite time. The scale of the deviations of the kinetics of the recombination process in the multi-pair clusters from the kinetics for the isolated pairs was estimated. Another series of the computer experiments simulate diffusion-controlled recombination (annihilation) of ions in model supersaturated solutions with different concentrations of ionic solutes and different dielectric constant of the solutions. The simulations yield the ion survival probability as a function of time and allow us to calculate the rate constant of the ion recombination as a function of the ion concentration.     

Computation tool for assessing the probability characteristics of the stress state of the pipeline part defected by pitting corrosion

One of the factors affecting the life-time of the main pipelines is their susceptibility to different types of corrosion. A common type of pipeline corrosion is pitting corrosion which is a form of localized corrosion – a random process occurring in a certain section of the pipeline, leading to walls thinning under the influence of the external environment. Such a change in the pipeline geometry accompanied by a significant change in the local stress–strain state leads to a large number of emergencies.This work deals with the analysis of probability characteristics of the stress–strain state arising in the areas damaged by pitting corrosion. To determine the parameters of the stress–strain state the finite element method is used. The pipe material is modeled as elastoplastic with a bilinear diagram of plasticity.Pitting corrosion is modeled as a set of randomly positioned half-spheres with the same radius subtracted from the volume of the pipe. Coordinates of pitting defects centers obey to a uniform probability density function (PDF). Using this approach we take into account the mutual influence of defects on the pipe stress–strain state.A special macro was developed to determine the parameters of the stress–strain state of the corroded pipe. It allows performing automatic calculation and processing of the data for pitting corrosion defects. Parameters of the PDF of stress concentration factor depending on the radius of the defect were determined in accordance with the results of simulation. The kernel density estimation and generalized extreme value distribution was chosen as PDF approximation on the basis of the conditions of the Fisher–Tippett–Gnedenko theorem. The change of the PDF shape was investigated for different defect radii. The coefficient of variation, mean and standard deviation of stress concentration factor as function of defect radii were studied as well as reliability function of the pipe part was obtained using the criterion of plastic deformation occurrence.     

Soil-structure interaction and effect of axial force on the dynamics of offshore structures

The offshore structures are flexible systems subjected to various types of loadings. The heavy gravitational loads on the top decks, wind and water wave pressures acting on the platforms are transferred to the soil through the piles or mat foundations. Under the vibration, the variation in the pore pressures induces additional effects on the embedded part of the piles. The effect of the soil-structure interaction on the dynamics of the structure is taken into account as the deformations of the soil caused by the motion of the structure which in turn modify the response of the structure. The effect of the axial forces, within the individual members, on the vibration of the structure is included in the formulation. The dynamic stiffness matrix of the members are developed by considering the actual mass distribution and the effect of the axial force of the members. For the members embedded into soil, the soil reactions and the skin frictions are also considered as continuously varying over the members. Therefore, the equations of motion are satisfied along any infinitesimal element of the members. The new formulation is introduced in the general purpose computer code STDYNL, then the sensitivity of the overall dynamic response of the deep water platforms to the variation of the soil characteristics and to the effect of the axial forces of the members are investigated.     

一种实用的LCD驱动电路的硬件设计

本文介绍一种实用的段码式LCD驱动电路的硬件设计。文章先分析了液晶显示器(LCD)的显示原理和液晶显示材料的特性,继而给出了LCD驱动电路的电路图,该电路无需软件驱动程序,易于在大规模或超大规模集成电路中实现。然后用Hspice和Verilog_xl两种仿真工具分别对该电路的COM端口和SEG端口进行了功能验证并给出了仿真波形和晶体管的设计参数(W/L)。从模拟验证的结果看,该电路的设计符合了LCD的驱动要求。     

基于深度相机的手腕识别与掌心估测

目的当手和手臂都进入深度相机所设定的有效深度范围时,它们将被作为一个整体来提取,若处理时也把它们作为一个整体,这可能会影响手势交互的一些重要算法,如掌心估测、手朝向估测、手的跟踪等。掌心是手势交互中较为稳定的点,掌心与手簇中心的连线常被用来估测手的朝向。因此提高掌心估测算法的性能有助于提高手势交互的整体性能。方法为了有效地分割手与手臂,从分析手腕的运动特征和手的轮廓特点入手,并利用内切矩形的几何特征,提出手腕识别算法;为了提高掌心估测的性能,从手势交互的特点入手,分析了锐角三角形和最大内切圆的几何特征,提出新的掌心估测算法。结果本文算法在空气多点触摸系统中进行了实验,新的掌心估测算法较之原算法在性能上提高了近7倍,且仍然能保持掌心坐标的稳定性,坐标偏差不大于3个像素。同时手腕识别算法的引入也提高了掌心估测的准确性。结论实验结果表明,手腕识别算法能较好地分割出手与手臂,新的掌心估测算法能很好地支持实时交互。     

A tool for computing computer network reliability

The computation of the reliability of a computer network is one of the important tasks of evaluating its performance. The idea of minimal paths can be used to determine the network reliability. This paper presents an algorithm for finding the minimal paths of a given network in terms of its links. Then, it presents an algorithm for calculating the reliability of the network in terms of the probabilities of success of the links of its minimal paths. The algorithm is based on a relation that uses the probabilities of the unions of the minimal paths of the network to obtain the network reliability. Also, the paper describes a tool that has been built for calculating the reliability of a given network. The tool has two main phases: the minimal paths generation phase, and the reliability computation phase. The first phase accepts the links of the network and their probabilities, then implements the first proposed algorithm to determine its minimal paths. The second phase implements the second proposed algorithm to calculate the network reliability. The results of using the tool to calculate the reliability of an example network are given.     

柔性密封条截面误差自动视觉测量方法

目的 在柔性密封条误差测量过程中,密封条容易弯曲且形变较大,直接匹配精度较低,测量误差大。针对此问题,提出了一种新的柔性密封条截面误差自动视觉测量方法。方法 通过两步图像轮廓配准来获取测量图段和设计图段之间的匹配关系,然后进行误差度量和质量检验。1）通过基于多分辨率的轮廓角点提取算法提取出密封条轮廓的角点,然后基于最小化均方误差的思想进行穷举搜索,计算初始配准结果,再使用线性回归进行微调进一步提高初始配准结果;2）利用形状描述子进行局部轮廓配准,进一步获得两张轮廓图之间的精确局部配准结果;3）进行不同类型的误差定量计算和结果对比,主要测量的误差类型包括点偏移误差、点极限距离误差和角度位置误差等形位误差。结果 对密封条进行了逐步轮廓配准和多种误差测量,并在实际生产中进行了测试。实验结果表明,该系统配准结果好,测量精度高。该系统测量精度远高于密封条测量系统精度标准0.2 mm,且系统检测结果与实际人工检测结果完全一致,能有效促进柔性密封条自动化检测的发展。结论 提出了一种新的柔性密封条截面误差自动视觉测量方法,该系统具有良好的稳定性和可靠性,能有效进行柔性产品误差测量和质量检验。     

The MISCAN simulation program for the evaluation of screening for disease

The computer program MISCAN is developed for use in evaluation of mass screening for disease. The program uses Monte Carlo simulation. It produces output on the results of screening projects and on the effects of screening on morbidity and mortality on the individual and population level. The calculations are based on models of the natural history of the disease and of the impact of screening on the natural history. The approach is such that considerable flexibility exists in specifying the structure of the model and its parameters. The program consists of two parts. The DISEASE part can be used for simulating the epidemiology of the disease when no screening is taking place; it requires input on the population and on the disease process. The SCREENING part is to be used in combination with the DISEASE part. It is intended for simulation of the results and effects of a screening project. It requires input on the properties of the screening tests, the consequences of early detection by screening, and the policy (ages and intervals between screens) of the project. MISCAN can be used for finding model assumptions regarding the disease process and the impact of screening that give a good explanation of the observed results of a screening project. Such an analysis proceeds in two steps. First, MISCAN is used to calculate simulated results of the project, based on specific assumptions. Next, these results are tested against the observed results, in order to assess the acceptability of the assumptions. MISCAN can also be used for optimization of the screening policy by simulating the cost and benefit components of a large number of different screening policies.     

线结构光光条中心提取算法

目的 线结构光视觉测量是一种利用可控光源和数字图像的主动视觉测量方法,光条中心提取是线结构光视觉测量的关键技术,直接影响到线结构光视觉测量的精度。传统灰度重心法只在图像的横向或纵向上计算光条的灰度重心,没有考虑光条的法线方向,精度较低。本文提出一种改进的光条中心提取算法,以期实现光条中心的精确提取。方法 在分析线结构光的光条灰度特性基础上,基于传统的灰度重心法,提出一种改进的两步提取算法。基于图像差分法从原始图像中分离出有效的线结构光光条,采用传统灰度重心法对光条中心进行粗提取;在粗提取的光条中心点处通过自定义的方向模板确定光条的法线方向,以粗提取的光条中心点为中心,沿法线方向采用灰度重心法进行二次提取,获取线结构光光条的中心。结果 本文采用CCD相机、镜头、线激光器及辅助机构搭建线结构光视觉系统,采用提出的算法对线激光器投影产生的直线型光条、非连续光条和弯曲光条的中心进行提取。通过光条中心提取实验获取的光条中心线的走向与光条的走向大致相同,符合预期的光条中心线。本文将Steger法作为评价标准,分别计算本文算法、传统灰度重心法与Steger法提取的光条中心的偏差,通过对比实验可知,本文算法提取的光条中心的偏差更小,并且程序运行时间比Steger法减少了3 s以上。结论 本文研究线结构光的光条中心提取算法,对传统灰度重心法进行改进,能够实现直线型光条、非连续光条和弯曲光条等不同形状光条的亚像素级中心提取,并且在保证较少的程序运行时间的同时,能够提高传统灰度重心法的光条中心提取精度。