基于子结构法的土-地下空间结构体系地震反应高效计算系统研究

为研发适用于土-地下空间结构相互作用体系地震反应分析的高效计算系统,本文基于子结构方法,综合利用ABAQUS软件和SASSI 2010的各自优势,通过二次开发,构建了一个适于土-地下空间结构动力相互作用分析的高效计算系统(ABAQUS-SASSI 2010 Combined System,简称ASCS)．该计算系统实现了ABAQUS软件和SASSI 2010的无缝连接,用户可以按照ABAQUS软件的可视化前处理功能,方便地建立包括土-地下空间结构相互作用体系在内的各种有限元模型,并调用和执行SASSI 2010程序的不同模块,按子结构方法对整个体系实施高效计算．为验证ASCS计算系统的有效性,文中首先采用ASCS计算系统对日本阪神地震中大开地铁车站的震害进行了模拟;然后,采用ABAQUS软件建立土-大开地铁车站结构相互作用体系的整体有限元分析模型,通过对比分析ASCS计算系统的子结构法结果和ABAQUS软件的整体有限元法结果,进一步验证了ASCS计算系统的计算精度和效率．结果表明：基于本文ASCS计算系统的数值模拟结果与阪神地震中大开地铁车站的震害结果一致;ASCS计算系统的子结构法结果与整体有限元法结果基本吻合,但前者的CPU时间是后者的1/21,明显提高了计算效率．     

对CAI的三点认识

计算机和网络的发展正在引发一场教育史上的革命,这是一件好事．笔者曾多次参加或主持ＣＡＩ软件的开发工作,在实践中感到树立正确的观念可以帮助我们自觉地参与这场革命．这里,谈谈自己对ＣＡＩ的一些认识和思考．计算机可以“实时”处理数字化的视频和音频信息,网络...     

基于LabVIEW的便携式锚杆长度检测系统开发

基于LabVIEW软件平台开发了便携式锚杆长度检测系统。该系统包括一个带有信号激励接收功能的便携式工控机、探头和上层控制软件。首先通过软件设置硬件参数,TB-1000信号激励接收卡在探头上激励出超声导波信号并采集反射回波,经模拟滤波器处理后进入NIPCI-5102数据采集卡,将模拟信号转换为数字信号输入PC计算机。本系统软件可对激励接收卡设置激励信号参数,并具有对采集到的信号进行频域变换、希尔伯特变换、小波降噪、快速傅利叶变换(STFT)、扫频成像等处理功能。通过实验,证明了该软件系统具有较高的实时性和可操作性,较好地实现了锚杆长度的快速检测,扩大了超声导波在此领域的应用。     

Operation and Optimization of a Linux PC farm for Physics Analysis in the ZEUS Experiment

The ZEUS experiment has migrated its reconstruction and analysis farms to a PC-based environment.More than one year of experience has been acquired with successful operation of an analysis farm designed for several hundred users.Specially designed software has been used to proveide fast and reliable access to large amounts of data (30 TB in total),After the ongoing upgrade of the HERA luminosity,higher requirements will arise in terms of data storage capacity and throughput rate,The necessity of a bigger disk cache has led to consideration of solutions based on commodity technology,PC-based file servers are being tested as a cost-effective storage system,In this article we present the hardware and software solutions deplogyed and discuss their performance.scalability and maintenance issues.     

城市地下管网图形信息管理系统的开发框架设计与应用

论述了图形信息系统的组成，并通过城市地下管网图形信息管理系统的开发实例探讨了有关图形信息管理系统开发的各种框架模式及其特点。     

加速器控制系统及其进展

目前加速器控制系统普遍采用了分布式体系结构,使用系统集成工具进行开发,当前加速器界主流的系统集成工具有.EPICS、TANGO和商业SCADA产品.在硬件方面,PGA、DSP芯片广泛地用于硬件模块中实现数字化控制,嵌入武EPICS IOC智能控制器是当今研究的一个热点.软件方面,除系统集成工具之外,各大实验室都建立了自己的软件开发环境,对软件开发进行标准化管理,其中开放的软件平台Eclip8,beans活跃在控制系统软件开发中.目前具有挑战性的课题是系统高可用性研究.本文将介绍加速器控制系统及技术方面的现状和进展.     

高校学生收费系统的开发

概要地介绍了笔者自行开发的高校学生收费软件的特色、性能、所采用工作平台和开发工具、主要的功能模块及各模块的基本功能,给出了高校学生收费系统的功能模块图。     

The ALICE Data Challenges

Since 1998,the ALICE experiment and the CERN/IT division have jointly executed several large-scale high throughput distributed computing exercises:the ALICE data challenges.The goals of these regular exercises are to test hardware and software components of the data acqusition and computing systems in realistic conditions and to execute an early integration of the overall ALICE computing infrastructure.This paper reports on the third ALICE Data Challenge (ADC III) that has been performed at CERN from January to March 2001.The data used during the ADC Ⅲ are simulated physics raw data of the ALICE TPC,produced with the ALICE simulation program AliRoot.The data acquisition was based on the ALICE online framework called the ALICE Data Acquisition Test Environment (DATE) system.The data after event building,were then formatted with the ROOT I/O package and a data catalogue based on MySQl was established.The Mass Storage System used during ADC III is CASTOR.Different software tools have been used to monitor the performances,DATE has demonstrated performances of more than 500 MByte/s.An aggregate data throughput of 85 MByte/s was sutained in CASTOR over several days.The total collected data amounts to 100 TBytes in 100.00 files.     

Software Process Improvement in CMS—Are we Different？

One of the most challenging issues faced in HEP in recent years is the question of how to capitalise on software development and maintenance experience in a continuous manner.To capitalise inour context means to evaluate and apply new technologies as they arise,and to further evolve technologies arlready widely in use,It also implies the definition and adoption of standards,while ensuring reproducibility and quality of results.The CMS process improvement effort is two-pronged.It aims at continuous improve ment of the ways we do Object Oriented software,as well as continuous improvement in the efficiency of the working enviuronment.In particular the use and creation of de-facto software process standards within CMS has proven to be key to our successful software process improvement program.We describe the successful CMS implementation of a software process improvement strategy,following ISO 15504 since three years.We give the current status of the most important processes families formally established in CMS,and provide the guidelines we followed both for tool development,and methodology establishment.     

DEPUTY：Analysing Architectural Structures and Checking Style

The DepUty(dependencies utility)can be classified as a project and process management tool.The main goal of DepUty is to assist by means of source code analysis and graphical representation using UML,in understanding dependencies of sub-systems and packages in CMS object Oriented software,to understand architectureal structure,and to schedule code release in modularised integration.It also allows a new-comer to more easily understand the global structure, of CMS software,and to void circular dependencies up-front or re-factor the code,in case it was already too close to the edge of non-maintainability.We will discuss the various views DepUty provides to analyse package dependencies and illustrate both the metrics and style checking facilities it provides.