公用电话的现状及未来发展方向

本文介绍了公用电话系统新的技术特点，并分析、总结了它的未来发展方向。     

Known Good Die

Advances in reducing size and increasing functionality of electronics have been due primarily to the shrinking geometries and increasing performance of integrated circuit technologies. Recently, development efforts aimed at reducing size and increasingfunctionality have focused on the first level of the electronicpackage. The result has been the development of multichip packaging,technologies in which bare IC chips are mounted on a single high density substrate that serves to package thechips, as well as interconnect them. A number of benefits accruebecause of multichip packaging, namely, increased chip density,space savings, higher performance, and less weight. Therefore, thesetechnologies are attractive for today's light weight, portable, highperformance electronic equipment and devices.In spite of these benefits, multichip packaging has not shown the kind of explosive growth and expansion that was predicted[1]. A major inhibitor for these technologies has been theavailability of fully tested and conditioned bare die, orknown good die. This paper reviews the issues and technologies associated with test and burn-in of bareor minimally packaged IC products.     

硬盘保护卡与局域网映像克隆相结合的机房管理方法

如何对硬盘中的数据进行保护，如何在短时间内迅速地解决计算机的软件安装，维护等问题，确保教学秩序及教学质量，笔者介绍了一种高效经济的管理方法，即硬盘保护卡与局域网映像克隆相结合的方法。     

基于非接触式IC卡的信息管理系统

基于非接触式IC卡的信息管理系统由软硬件组成。硬件主要包括3部分，读写部分，读出或写入射频卡中的数据，其功能主要由SHC1702读写模块完成；显示部分，使用TMl2232A显示芯片以点阵显示代替LED段显示；串口通信部分：负责计算机和刷卡装置之间的通信，使用MAX485芯片以保证足够的通信距离；此外采用的X5043芯片带有4kB的闪存，能在单片机“死机”或掉电的情况下，及时保存重要数据，并尽快使之恢复正常工作状态。软件部分包括单片机的下位机程序，PC机的上位机程序，数据库，实现通信、管理等工作。     

基于SOPC的音乐播放系统

提出了一种基于NiosII的音乐播放系统,主要实现通过对在SD卡存放的音频文件的读取操作,经过Avalon总线送至音频DAC电路播放音频文件。本设计基于SOPC技术,使用NiosII软核处理器实现,包括软硬件设计两个主要部分。硬件部分主要负责对WM8731和SD卡的ip核编写及调试以使其能挂在总线上,使硬件实现其功能。软件部分主要负责对SD卡按其时序进行音频文件的读取操作。     

Java Card技术在数字化校园一卡通中的应用

智能卡在世界范围内得到了广泛的应用,但是其开发确实一个漫长而又复杂的过程。Java Card技术具有编程简单、开发周期短、安全性强、可重用等特点,将Java Card技术应用到校园一卡通当中,可以很好的解决校园卡存在的平台安全隐患、功能单一、移植性不强等问题。     

IC卡式电量检测装置及其数据处理软件

介绍了一种用于检测大功率电动机电量的IC卡式电量检测装置及其数据处理软件。利用基于VB开发环境的数据处理软件,通过分析采集的数据,能够掌握被检测设备的运行状况并预测故障隐患,实现设备的安全高效运行。     

A secure authentication with key agreement scheme using ECC for satellite communication systems

Recently, Liu et al came up with an authentication with key agreement scheme for securing communication over the low‐earth‐orbit satellite communication systems. However, this paper demonstrates that this scheme cannot provide perfect forward secrecy or defend against the smart card stolen attack, and has some very bad design defects, making it unpractical. Thus, to design a truly secure authentication scheme for satellite communication systems, this paper presents a new scheme, making use of the advantages of elliptic curve cryptography and symmetric cryptography. The security analyses by the widely used BAN logic and heuristic discussions demonstrate that our new scheme possesses perfect security properties and can defend against various well‐known malicious attacks. Moreover, our new scheme allows users to update passwords locally in accordance with their wishes, achieving a good user experience.     

指纹识别技术在智能卡中的应用

作为现代个性化的信息工具，智能卡已经呈现出越来越旺盛的生命力。为了加强智能卡的安全认证能力，智能卡商和研究人员在智能卡中引进了指纹生物技术，来取代传统的个人密码鉴定方法。本文先介绍了智能卡和指纹识别系统的组成，然后通过分析智能卡的卡上资源，指出智能卡是资源受限系统，指纹识别技术应用于智能卡时需注意的问题及其相应策略。文章的最后是指纹识别技术在智能卡中的应用系统设计模型。     

一种基于PCI Express总线的DMA高速传输系统

介绍了DMA高速传输系统的结构以及DMA的设计,搭建了×8通道的PCIE系统.在整个系统的板卡终端,连接了两个FIFO,提供标准的FIFO接口,能连接光纤数据、CT图像采集数据、A/D采样数据等.实验验证了DMA读和DMA写两种传输方式的可靠性,测试了DMA读写的传输速度.实验表明,在单次DMA传输大小达到1MB时,×8通道的PCIE系统DMA读和写速度均能达到1 000 MB/s,可满足大部分高速数据传输的要求.