基于5S理念的图书馆数字设备管理

在论述5S管理内涵的基础上，将现代企业的5S管理理念引入图书馆数字设备的管理，并分析了图书馆数字设备管理的现状与存在的问题，探讨了5S方法在图书馆数字设备管理中的具体应用。     

基于DSP的全数字交流伺服驱动器的设计与实现

阐述了交流永磁式同步电机的磁场定向控制原理，设计了一款采用高性能的DSPTMS320LF12407A作为核心运动控制芯片，以智能功率模块FM100CVA120的IPM为逆变器开关元件，辅以AT89S52的单片机进行控制参数设定、键盘处理、状态显示、串行通讯的全数字交流伺服驱动器．该驱动器具有控制接口丰富、结构紧凑、宽调幅比等特点．     

基于机群并行通信处理HCP的选播通信操作算法

在我们自行研制的并行通信处理器HPC基础上，给出了一种基于Hypercube互连网络环境下的通信处理器HCP的选播通信算法，该算法可实现网络上的一个HCP向其他任意多个HCP发送相同的Frame的操作。     

Two-Way Digital Video Transmission over Medium-Voltage Power-Lines Using Time-Domain Synchronous Orthogonal Frequency Division Multiplexing Technology

This paper describes field trials of two-way digital video transmissions over a 700-m long medium-voltage power cable using a frequency division duplex scheme. The purpose is to check the feasibility of using time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) technology in powerline communication (PLC). TDS-OFDM is the core technology in digital multimedia broadcasting-terrestrial (DMB-T), developed by Tsinghua University for digital television terrestrial multimedia broadcast applications and successfully adopted in the Chinese Digital Terrestrial Television Broadcasting Standard. PLC systems are widely believed to be bandwidth or data throughput limited. However, the use of known pseudo random sequences as guard intervals for synchronization and channel estimation in TDS-OFDM greatly reduces the system overhead and increases the spectrum efficiency. These experiments show that TDS-OFDM is appropriate not only for broadcasting but also for PLC applications with appropriate modifications.     

数字图书馆对馆员继续教育的影响

论述了数字图书馆对传统图书馆的变革,并就数字图书馆馆员应具备的素质及馆员继续教育的途径与方法进行了探讨。     

SGB1000型陀螺罗经接口设计与实现

由于SGB1000型罗经生产较早，没有预留接口，不能满足直接在指挥监控系统显示信息的需要．在此，在SGB1000型罗经传向系统原理基础上，提出了应用单片机将罗经所提供的航向信息进行处理，通过转换电路，转换成标准的RS-232C接口信号输出，供计算机等外部设备接收的接口改造方法．具有一定的实用价值．     

DSP+ARM微处理器在电动机微机保护装置设计中的应用

本文提出了一套基于DSP ARM的新型电动机测控保护装置的硬件设计方案。在对电动机故障原因及总体设计思想做了分析的基础上,重点介绍了硬件构成的测控板、交流变换板、开入开出板、显示板、总线板和扩展板模块,并对电动机测控保护装置的具体设计实现和关键技术进行了论述。     

A FRAMEWORK FOR REAL-VALUED CIPHER SYSTEMS

Most cipher systems designed thus far are binary-valued or integer-valued cipher systems. Their security relies on the assumption that one-way functions exist. Though the existence of one-way functions has not been proved yet, most cryptographic researchers believe that one-way functions exist. In addition, many candidates for one-way functions have been proposed. Therefore, the key step for developing real-valued cipher systems is to define real one-way functions and to propose candidates for them. In this paper, based on computational complexity theory over the real field, we give two definitions of real one-way functions; one is for digital one-way functions and the other is for general one-way functions. Candidates for these two classes of one-way functions are also proposed. Moreover, we present two examples to demonstrate that the candidates for both digital one-way functions and general one-way functions can be applied to construct secure real-valued cipher systems.     

一种基于DDS技术实现的雷达信号模拟器

介绍一种基于直接数字合成 (DirectDigitalSynthesis,DDS)技术的雷达信号回波模拟器的信号仿真及硬件实现方案。这种模拟器可以模拟生成脉冲雷达接收机末端的视频信号输出 ,并能灵活地实现对回波中的目标、噪声和杂波特性的控制 ,具有良好的可编程性。     

非线性编辑系统的应用

非线性编辑系统是近年来普遍推广的由计算机与视频技术相结合开发出的一门新技术，它向用户提供了一种全新的工作方式，给电视后期制作人员带来了新的概念，新的方法。电视制作中制作人员的艺术追求将不再因技术和设备绝缘而显得被动和无奈。通过本文可以了妥到什么是非线性编辑及非线性编辑系统的应用。