激光数码全息在DVD光盘产业的应用

本文介绍了一种激光数码全息在DVD光盘产业中的应用.包括数码全息图像设计、母版光刻、金属模版制作,注塑模加工和DVD全息图像注塑等工序.DVD光盘采用数码全息版面装饰,一方面可免去对环境空气有严重污染的光盘油墨印刷工序,更为重要的是可为正版光盘提供版权保护.并分析讨论了数码全息与DVD光盘结合的产品质量因素及其在光盘产业中的应用前景.     

DVD光学头误差探测器性能参数检测与评价

DVD光学头误差探测器的性能参数对其伺服精度的读出信号均有重要的影响，本文介绍了误差探测器的结构及信号检测原理，重点探讨了离焦误差探测器和道跟踪误差探测器的安装精度对光学头在DVD模式和CD模式下聚焦和寻迹伺服性能的影响，同时给出了具体的性能参数评估公式，并根据实验测试结果对误差探测器性能参数的检测和评价方法进行了探讨。     

基于GPIB总线的DVD光学头动态信号测试与评价系统

文章阐述了研制DVD光学头参数测试与评价系统的意义和作用，介绍了系统的总体方案和设计思路，以及在硬件开发和软件设计中需要考虑的问题和难点。     

Encryption and watermarking for the secure distribution of copyrighted MPEG video on DVD

This paper presents a complete system for the secure distribution of a copyrighted MPEG-1/2 video stored on a DVD-ROM disc. A combined selective watermarking and encryption method that operates in the compressed MPEG domain is introduced. Watermarking resistant to a number of attacks is used for copyright protection. The video quality deteriorates significantly due to encryption, thus restraining unauthorized viewers from viewing it. The video can only be viewed using the developed Secure MPEG Player, which performs real-time decryption of the encrypted video. The decryption requires a secret key that is extracted from the DVD-ROM disc in a cryptographically secure manner.This work was supported by the EU IST Project "ASPIS"     

浅谈大学英语口语教学

根据Krashen的语言教学理论,现代大学英语口语教学,应利用DVD技术进行完全英语情景的地道口 语教学。     

DVD在线租赁业务中的数学模型

2005国大学生数学建模竞赛B、D题背景是DVD在线租赁业务。本文对竞赛论文中出现的主要模型和方法进行简要介绍和分析，并指出以此为背景还有很多问题可以继续研究。     

DVD跨轨伺服控制的优化设计

针对DVD光盘技术要求伺服控制系统的控制精度不断提高,尤其是对于跨轨伺服控制的要求更加苛刻的问题,为了更好地优化伺服控制的控制策略,利用Matlab提供的模糊控制工具箱,计算出模糊PD控制的系数整定规则表。系统根据外界干扰的变化实时改变相应的控制参数,达到提高DVD跨轨伺服控制环路的控制要求和控制精度的目的。实验表明,该方法使激光读取头能够以更短的时间和更快的速度到达目标轨迹。     

用于DVD的MPEG2实时解码器研制

MPEG2作为数字视频压缩技术的国际通用标准,其实时解码器在数字视频产品中有着广泛的应用。本文介绍了一种采用部分总线结构的,用于DVD的MPEG2实时解码器的设计及硬件实现,并对系统的特点和其中的几个关键问题作了详细的分析与讨论,最后给出了实验结果及分析。     

Survey of the 1997, 1998 and 1999 annual technical reports on patent information activities (part II: I to Z)

The activities of 59 intellectual property offices and organisations worldwide in the field of patent information are summarised for the period 1997–1999. The summary is presented under eight standard headings, as far as relevant, for each country. Activity varies enormously from just a handful of applications through to RU (24K), GB (30K), DE (58K), KR (80K), EP (121K), US (270K utility patents), and Japan (405K); the numbers are continuing to increase significantly in most countries. This part (second of two) covers 35 countries and organisations, with WIPO codes starting I to Z.The author concludes, inter alia, that

(i) the number of patent applications is increasing at such a rate that the granting or registration activities of many IP Offices are unable to keep up;

(ii) the development of electronic filing systems is proceeding apace;

(iii) the IPC, or derivatives such as ECLA, continue to be the primary tools for allocation, classification, and search in all IP Offices, except US and GB;

(iv) automated search systems continue to be developed and are used in tandem with manual search files, commercial and free Internet online databases; and

(v) the use of complex jukebox systems to handle the vast numbers of patent specifications on CD-ROM continues to increase.

共焦双光头多层数据存储系统

为了实现双光子多层数据存储系统的实用化,利用现有DVD高精度聚焦、循迹伺服技术,构建了共焦双光头多层数据读写系统,实现读写焦点在三维存储材料中的精确定位.同时由D/A输出选层信号控制音圈电机,实现了层间跳转,达到了多层读写之目的.本文通过建立光学头的音圈电机模型以及音圈电机控制器模型,实现对共焦双光头多层存储系统的建模与仿真,并给出已有的实验结果.