商场商品进销存管理信息系统的设计与实现

介绍了一个覆盖大型商厦基于NOVELLNETWARE3．12网络操作系统,以ORACLE7分布式数据库为支撑的商厦MIS中商场商品进销存管理系统的设计与实现。     

基于数据质量的机电系统BIT虚警研究

机电系统机内自测试(BIT)虚警问题一直是困扰其发展和应用的重要因素.本文首先明确了数据质量在机电BIT检测过程中的作用,对数据质量的属性及数据异常判断方法做了简要介绍.在分析了数据异常将可能导致BIT虚警之后,提出在BIT诊断和决策前加入数据异常判断环节,分析结果表明,此方法能够有效地降低机电BIT系统虚警率,提高其故障检测率.     

银行数据卫星通信系统总体设计概要

重点介绍了于1989年10月开始试验和运行的银行数据卫星通信系统总体设计,包括建设规模、业务量估计、技术体制、通信设备硬件配置和软件支持等。     

Mesh deformation on 3D complex configurations using multistep radial basis functions interpolation

The Radial Basis Function (RBF) method with data reduction is an effective way to perform mesh deformation. However, for large deformations on meshes of complex aerodynamic configurations, the efficiency of the RBF mesh deformation method still needs to be further improved to fulfill the demand of practical application. To achieve this goal, a multistep RBF method based on a multilevel subspace RBF algorithm is presented to further improve the efficiency of the mesh deformation method in this research. A whole deformation is divided into a series of steps, and the supporting radius is adjusted in accordance with the maximal displacement error. Furthermore, parallel computing is applied to the interpolation to enhance the efficiency. Typical deformation problems of the NASA Common Research Model (CRM) configuration, the DLR-F6 wing-body-nacelle-pylon configuration, and the DLR-F11 high-lift configuration are tested to verify the feasibility of this method. Test results show that the presented multistep RBF mesh deformation method is efficient and robust in dealing with large deformation problems over complex geometries.     

Statistical analysis of geomagnetic field variations during solar eclipses

We investigate the geomagnetic field variations recorded by INTERMAGNET geomagnetic observatories, which are observed while the Moon’s umbra or penumbra passed over them during a solar eclipse event. Though it is generally considered that the geomagnetic field can be modulated during solar eclipses, the effect of the solar eclipse on the observed geomagnetic field has proved subtle to be detected. Instead of exploring the geomagnetic field as a case study, we analyze 207 geomagnetic manifestations acquired by 100 geomagnetic observatories during 39 solar eclipses occurring from 1991 to 2016. As a result of examining a pattern of the geomagnetic field variation on average, we confirm that the effect can be seen over an interval of 180?min centered at the time of maximum eclipse on a site of a geomagnetic observatory. That is, demonstrate an increase in the Y component of the geomagnetic field and decreases in the X component and the total strength of the geomagnetic field. We also find that the effect can be overwhelmed, depending more sensitively on the level of daily geomagnetic events than on the level of solar activity and/or the phase of solar cycle. We have demonstrated it by dividing the whole data set into subsets based on parameters of the geomagnetic field, solar activity, and solar eclipses. It is suggested, therefore, that an evidence of the solar eclipse effect can be revealed even at the solar maximum, as long as the day of the solar eclipse is magnetically quiet.     

平面度误差原始测量数据的平差处理及微机数据处理

本文介绍了平面度误差原始测量数据平差处理的方法,给出了微机数据处理的高级语言程序的流程框图,将平差处理的计算结果与按平板检定规程计算的结果进行了比较,并分析了两种处理方法的精度。     

基于高速数据采集技术的脉冲幅度测量方法研究

介绍了几种脉冲幅度的测量方法和它们的优缺点,可以根据测试的实际需要选择最适合的测量方法。文中作者提出了一种新的利用高速数据采集技术测量脉冲幅度的设想,给出了系统基本组成及测量原理、数据计算方法和软件设计思路,该方法可以解决高速、高精度、窄脉冲的实时测量问题。该测试系统组成灵活,可以根据不同的脉冲信号周期、脉宽和测试精度灵活选择不同的数据采集卡,满足测试要求,并达到最高性价比。     

用修正数据映射方法实现快速稳健子空间跟踪

为改善现有子空间跟踪方法的运算量大或鲁棒性/稳定性差等缺点,基于原数据映射方法(DPM),采用新的正交归一化,提出了一种快速稳健的修正DPM(MDPM)算法。通过改变符号选择跟踪信号子空间或噪声子空间,同时提供了子空间基的正交矢量,运行时无累积性误差。研究和仿真结果表明:与传统子空间跟踪算法相比,MDPM算法的鲁棒性/稳定性好、收敛速度快、运算量小。     

微小型大气数据采集系统设计与实现

大气数据采集对飞行器自动控制具有重要的意义。根据系统实时性和小型化的要求,设计了一种微小型大气数据采集系统。该系统以TMS320F2812为控制器,采用高精度A/D转换器和均值滑动滤波的方法来提高测量精度;由于软件采用了μC/OS-II,大大简化了系统的管理、维护工作。该系统结构简单、体积小、成本低,试验结果表明该系统测量精度高,具有较高的实际应用价值。