Structural reliability software at the University of California, Berkeley

The paper provides an overview of three software for structural reliability analysis developed at the University of California, Berkeley. These are CalREL, which is a general-purpose structural reliability code written in FORTRAN; FERUM, which is a collection of Matlab^® files that can be used for structural reliability analysis in conjunction with simple finite element models; and OpenSees, which is an object-oriented code for nonlinear structural response simulation with reliability capabilities. Reliability analysis methods featured by these software include FORM, SORM, Monte Carlo simulation, and various importance sampling methods. In addition, variable importance and sensitivity measures are provided.     

DMC数码航摄及制作1：500正射影像图（DOM）的实践与探索

介绍了数码航摄构成和特点，及利用数码数据制作DEM、DOM的工艺流程和成果精度检测。     

应用数字化测图的几点体会

文章简要阐述了数字化测图的概念、特点以及所引起的行业变革.探讨了从数字化测图的数据采集、数据处理和数据输出到图形编辑处理、成果与图形输出的作业流程方法及工作中的注意事项和工作中的体会与思考,展望了数字化成图的发展优势和前景.     

Design and ARM‐embedded implementation of a chaotic map‐based multicast scheme for multiuser speech wireless communication

This paper proposes a chaotic map‐based multicast scheme for multiuser speech wireless communication and implements it in an ARM platform. The scheme compresses the digital audio signal decoded by a sound card and then encrypts it with a three‐level chaotic encryption scheme. First, the position of every bit of the compressed data is permuted randomly with a pseudo‐random number sequence (PRNS) generated by a 6‐D chaotic map. Then, the obtained data are further permuted in the level of byte with a PRNS generated by a 7‐D chaotic map. Finally, it is operated with a multiround chaotic stream cipher. The whole system owns the following merits: the redundancy in the original audio file is reduced effectively and the corresponding unicity distance is increased; the balancing point between a high security level of the system and real‐time conduction speed is achieved well. In the ARM implementation, the framework of communication of multicast–multiuser in a subnet and the Internet Group Manage Protocol is adopted to obtain the function of communication between one client and other ones. Comprehensive test results were provided to show the feasibility and security performance of the whole system. Copyright © 2016 John Wiley & Sons, Ltd.     

氧输送管路动态水试仿真分析

利用AMESim软件针对某型运载火箭氧输送管水试试验进行仿真分析,建立无蓄压器和带蓄压器试验系统仿真模型,模拟试验过程中的主要压力变化,并利用软件自带的FFT变换(快速傅立叶变换)获取管路在与水介质耦合作用下的一阶频率和二阶频率。通过对比分析发现,仿真结果与试验结果比较吻合,验证了仿真模型的有效性。     

基于现场试验的水文地质参数计算可视化程序设计与应用

水文地质参数的计算工作一直是工程地质和水文地质界工程师们所关注的重点问题之一,传统的计算方法比较繁琐、费时,国内外目前也没有比较全面的水文地质求参软件,因此,本文利用Visual Basic语言研究开发了一款基于现场试验的水文地质参数计算的新型软件SHP,通过数据库调用Excel文件录入数据,利用最小二乘法原理拟合直线。实现了手动配线和自动配线两种方法求参。通过南京市玄武湖隧道工程实例的校验,结果表明,该软件实用性强、计算精度较高、人机交互简单,满足工程需要。     

谈数字技术应用于建筑设计创新

建筑是人类生活繁衍的载体,科学技术地运用不断促使建筑设计向更加规范化、高效化、合理化发展。本文针对数字技术对建筑设计创新带来的革命性变革,浅析了数字技术在建筑设计应用中的几个特点和具体的应用方向。     

电梯紧急救援中心软件的直角坐标定位及两点、三点定位

摘要：介绍了一种既利用电子地图进行定位又独立于电子地图的～类电梯紧急救援软件的定位及距离计算模式。着重论述了软件中各数据点（即电梯使用单位和电梯维保单位的位置）的定位方式。当这些数据点离基点较近时,可在电子地图上直接定位;而当这些数据点离基点较远时,则可以用两点或三点定位。应当指出的是。为了避免一些特殊情况,数据分区是必要的。     

结构工程施工虚实结合技术研究的依据和意义

从科学技术和工程应用方面论述结构工程施工虚实结合技术的意义,通过对国内外结构工程施工技术研究现状的回顾,讨论虚实施工控制研究的依据。结合虚实施工研究内容,展望可能取得的技术进步和需解决的关键问题。     

空调负荷的神经计算法

提出了一种新的空调负荷计算方法－空调负荷神经计算法，介绍了其概念，原理及方法。