一种基于电压瞬时值反馈的数字化逆变电源的研究

介绍一种基于数字PID控制算法的电压瞬时值反馈逆变电源，分析了其控制算法及控制框图，仿真表明该系统具有良好的输出响应特性。     

FIR滤波器的一种新型设计方法

System Generator是一款新型的FPGA辅助设计工具。本文首先简要介绍了System Generator的主要特色及设计流程，并以一个64阶的FIR滤波器的设计为例，给出了FIR滤波器设计的一种新方案。实验结果表明：该方法具有操作简单，设计灵活，效率高等优点。     

公开密钥基础设施PKI

公钥基础设施(PKI)基于公钥密码原理和技术，提供身份认证、机密性、数据完整性、不可否认性和安全时间戳等安全服务，是现阶段网络信息安全问题的综合解决方案。本文在对PKI的基本原理、技术标准、实施细节进行深入研究的基础上，主要论述PKI的组成、功能、相关标准以及PKI系统的主要应用。     

数字电视中的频域频率同步技术

提出了一种宽带数字电视地面广播（BDB-T）系统的同步解决方案，重点研究了频域中的频率同步部分，通过对各种算法的仿真分析比较，给出易于实现、节省资源的频域频率同步算法并完成了相应的FPGA硬件电路设计，经BDB—T功能样机在实际无线环境中的传输测试，证明了算法及其电路的良好实际工作性能。     

Monitoring of Paint Drying Process by Digital Speckle Correlation

The state of drying paint is monitored from the dynamic behaviors of the speckle pattern arising from laser illumination of the region inspected. Temporal variation of the peak height of the cross-correlation function between successive frames taken with a fixed interval is plotted until the peak maintains a stationary maximum value. We used a speckle pattern in the diffraction field for monitoring of a single region and that in the image field for simultaneous monitoring of various regions. Both the normal and the phase-only algorithms were compared for cross-correlation computation. The former showed more distinct variation of peak height.     

数字技术与科技进步

本文讨论并提出数字技术与数学科学的内在联系 .并根据实际的分析和研究 ,认为数字化技术只是信息化促进科技发展的一个阶段 ,尽管数字技术已经并将继续推动科技和生产力的发展速度     

A NEW ANONYMITY CONTROLLED E－CASH SCHEME

E-cash is a type of very important electronic payment systems.The complete anonymity of E-cash can be used for criminal activities,so E-cash should be anonymity controlled.Moreover,Elliptic Curve Cryptography(ECC)has been regard as the mainstream of current public cryptography.In this paper,a new anonymity controlled E-cash scheme based on ECC for the first time and using a new technology-one-time key pairs digital signature is designed,and its security and efficiency are analyzed.In our scheme,the coin tracing ,and owner tracing can be implemented.     

移动虚拟专用网业务

介绍在数字移动通信中虚拟专用网技术的业务特点，实现及原理及发展前景。     

Cost-Effective Migration from Sub-Lambda to Wavelength-Based Metro Networks

This article will discuss the importance of hybrid coexistence of sub-lambda grooming with wavelength-based services for driving down costs and maximizing the use of metro bandwidth, as well as enabling next-generation lambda-based services. The article will also address migration to all optical metro networks.     

一种用于神经计算的竞争电路的设计

作为一种重要的神经元网络的竞争电路，以往的电路实现结构往往有电路复杂度大和相互联接过多的缺点，不利于ＶＬＳＩ实现。在ｒａｉｌ－ｔｏ－ｒａｉｌ放大器结构的基础上，提出了一咱新的ＣＭＯＳ电路实现方法，解决了这些问题。ＨＳＰＩＣＥ的模拟结果证明了设计的正确性。