A triaxial accelerometer and portable data processing unit for theassessment of daily physical activity

The present study describes the development of a triaxial accelerometer (TA) and a portable data processing unit for the assessment of daily physical activity. The TA is composed of three orthogonally mounted uniaxial piezoresistive accelerometers and can be used to register accelerations covering the amplitude and frequency ranges of human body acceleration. Interinstrument and test-retest experiments showed that the offset and the sensitivity of the TA were equal for each measurement direction and remained constant on two measurement days. Transverse sensitivity was significantly different for each measurement direction, but did not influence accelerometer output (<3% of the sensitivity along the main axis). The data unit enables the on-line processing of accelerometer output to a reliable estimator of physical activity over eight-day periods. Preliminary evaluation of the system in 13 male subjects during standardized activities in the laboratory demonstrated a significant relationship between accelerometer output and energy expenditure due to physical activity, the standard reference for physical activity (r=0.89). Shortcomings of the system are its low sensitivity to sedentary activities and the inability to register static exercise. The validity of the system for the assessment of normal daily physical activity and specific activities outside the laboratory should be studied in free-living subjects     

Freeway-traffic data processing

Two basic data processing problems associated with freeway traffic are formulated: estimation of traffic variables (section mean speed and density) and detection of occurrence of an incident or accident within a given section of the road. The existing traffic sensors and the current estimation techniques and their shortcomings are reviewed. Stochastic models for traffic variables are developed and used to design optimum recursive estimators. The incident detection problem is introduced as a potential area where many interesting research topics exist.     

中波红外制导模拟系统图像处理单元设计

作为红外制导模拟系统的重要组成部分,该系统基于MFC设计开发了后端图像处理软件,主要完成以下功能:红外视频的显示、目标检测、多种算法的目标跟踪(包括质心跟踪、相关跟踪以及基于这两种算法的组合跟踪)、视频压缩存储以及系统控制和状态显示.在不增加任何硬件设施的前提下为系统实现了录像功能,且软件的自动目标提取有效弥补了弹上跟踪器的不足,为导引头操控提供了极大便利.     

CCD测量位移的数据处理

提要:利用CCD及相应的硬件得到物体始末位置的数据,通过插值,利用两点非均匀性校正对数据进行处理,利用函数相关计算出位移,计算结果的精度很高。     

基于MPC8260的WCDMA协议处理单元的实现

本文给出了一种利用微处理器MPC8260实现WCDMANodeB(基站)中协议处理单元的设计方案,具体硬件实现方法和软件体系结构。     

PC-compatible optical data acquisition unit

A personal computer compatible optical data acquisition unit is described. The unit hardware architecture consists of optical analog sensors, optical digital sensors, and standard digital-to-analog converters. It can be accessed and programmed using a variety of programming languages. The unit has several applications in color sorting, data communication, aerospace guidance, and remote optical sensing.     

国务院第一次全国经济普查领导小组办公室数据处理组副组长倪志良谈--第一次全国经济普查数据处理的安全

全国第一次经济普查将于2004年12月31日在全国展开。这次经济普查与以往搞过的人口普查、工业普查、基本单位普查等单项普查不同,是一项大规模的综合性普查。这次普查的对象是中国境内从事第二、第三产业活动的全部法人单位、产业活动单位和个体经营户,其规模之大、范围之广、内容之丰富在我国普查史上是前所未有的,也是有史以来调查样本最多、数     

基于数据挖掘的快速记录存储器数据处理技术

针对目前国内缺少专门分析快速记录存储器(QAR)数据的有效手段的情况,研究了一种新的基于数据挖掘的QAR数据的分析方法。首先结合聚类和概率分析对k-means算法进行改进,解决了聚类数目难以确定的难题,形成了良好的聚类效果;然后,在此基础上结合加权最小距离分类器及概率分析的方法,对待分类的QAR数据的类别属性进行判断以确定异常数据;最后给出了仿真实验,验证了该方法的可行性和有效性。     

数据表示形式在信息处理中的重要作用

随着现代社会信息化的加速,数据处理的作用日益重要,数据和数据库的使用量迅猛上升,文中分析了不同应用阶段对数据表示格式的不同要求,并提出在网络环境下数据表示形式的基本特点.     

The execution unit for the VLSI 432 general data processor

The microinstruction execution unit (MEU), which is one of two chips that implement a 32-bit VLSI object-oriented general data processor, is described. A functional overview of the MEU is given and important design tradeoffs are described, including some of the motivations for the particular partitioning of the functions between the two chips. Finally details of circuit implementation are described for some of the more interesting and important circuits on the chip.     

Pulsar receivers and data processing

The rapid variabilty of pulsar signals and the dispersive nature of the interstellar medium introduce a number of problems which are not inherent in other radio-astronomical observations. These problems are discussed and some of the techniques currently being used to cope with them are described.     

Wave-orientated processing of scattering data

Windowed transforms applied to scattering data gathered along an elevated track parallel to a scattering surface are shown to provide local plane wave spectra which can be backpropagated to synthesise distinct features of the scattering environment. The method is illustrated for plane wave scattering from a truncated array of pitched strips.<>     

The instruction decoding unit for the VLSI 432 general data processor

The instruction decoding unit (IDU), which is one of the two components used to implement a 32-bit VLSI, object-oriented general data processor is described. The instruction decoder is particularly novel in its ability to decode variable length, bit-aligned instructions at high speed. A brief discussion is given on both the organization of the variable length instructions and the microarchitecture of the general data processor. Some of the extensions made to classic state machine concepts are presented, along with a discussion of the circuits used to implement these extensions. Finally, the timing requirements and their associated circuit constraints are discussed.     

The data processing technique for integrated-optics acousto-optic RF spectrum analyzer

The system of Integrated-Optics Acousto-Optic RF Spectrum Analyzer (IOAOSA)consists of a laser diode, an Acousto-Optic (A-O) modulator, geodesic lenses and CCD detectorarray. The optical signal projected on the CCD array is converted into electrical signal andprocessed by the signal processing center which consists of a TMS 32010 system and an IBM-PC.The TMS 32010 with very high speed is used in a microcomputer system. A cycle sample methodis adopted to collect the data of the CCD video signal, sampling one per 40-point. After theprocessing, the frequency bandwidth, the resolution and the dynamic range of the system aremeasured to be 100 MHz, 8 MHz and 20 dB, respectively.     

Projections of data processing memory usage

An overview of the demand for various types of memory used with computer systems is presented. The types of memory and the major memory applications are discussed and analyzed for trends which will affect the amount and type of memory required for future computer systems. General business and scientific computers are by far the largest users of memory. This trend will continue with the advent of centralization of files, teleprocessing, and the use of virtual memory techniques to reduce the cost of memory and provide for machine-controlled memory management. The amount of on-line or direct-access memory available to users will continue to increase permitting extremely large files, program libraries, and information libraries which will be accessed by remote terminals and CPU's. Additional large demands for memory are developing in minicomputer-and microcomputer-based systems for industrial, business, and scientific uses as well as in intelligent terminal and data entry devices. These smaller processors, while contributing to the trend toward distributed processing, will also serve as the controllers for distributed file storage. The recent developments in the field of "mini" storage devices will be extended to provide even lower cost storage for use with small systems.     

Wavefront processing of radio-frequency wavefront data

A class of special-purpose processors is described. These processors are for use in holographic imaging systems that utilize electromagnetic waves with radio frequencies. The systems, which operate in very nearly real time, consist of arrays of receiving antennas with a receiver at each antenna. The received intensities control modulation in a second array of antennas that radiate waves generated by a coherent source at a frequency higher than the received waves. The processors are wavefront processors in two senses because they process received wavefronts and because the data flow resembles a wavefront. The processors are data driven so they require no clock, and they operate in parallel. Measurements with a prototype system are described, and a diffraction theory analysis of images is given. Extension to phase receivers and holograms are described, along with a discussion of visible image production in real time.     

一种基于网格的LiDAR数据处理平台架构

激光扫描测距技术迅速发展导致数据获取量急剧增长,已有集中式处理软件在处理速度、共享方式等方面显得不足.网格技术为复杂科学计算提供了性价比较高的解决方案.分析LiDAR数据处理流程,结合开放网格服务体系结构(OGSA),提出一种LiDAR数据处理平台体系,将数据处理任务合理划分并分配到各个分布的网格节点上,通过各节点并行、协同计算,达到提高运算速度的目的.最后以对激光点云重采样生成格网DEM为例,说明算法在该体系下的计算过程.     

基于CPCI总线的一体化数据处理中心的研究与实现

为了满足工业控制系统多功能和数据处理能力的需求,设计了基于CPCI总线的一体化数据处理中心。系统以FPGA芯片为硬件控制核心,利用硬件描述语言Verilog进行编程,采用自顶向下和模块化的设计方法,实现了在同一嵌入式产品上集成光纤通信、A／D、D／A、CPCI总线、SDRAM存储等功能,实现了系统的一体化、小型化。实际应用表明本系统稳定可靠、易于维护,满足工业控制领域的需求。