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The book is divided into 14 chapters, including Introduction, continuous control system theory, process and discrete sampling, Z transform, sampled-data systems, discrete approximation of continuous system the equivalent, based on mathematical transform the classical design method, based on state space pole placement design methodology, multi-variable system of quadratic optimal control, quantitative effects, the choice of sampling period, the digital control system modeling, digital control system for a variety of design methods, variables quadratic optimal control systems, sampling cycle of selection, non-linear control of the problem, as well as digital control system, a typical application - Disk drive servo control design.

全书共分14章，内容包括概论、连续控制系统理论、采样过程和离散化、Z变换、采样数据系统、连续系统的近似离散等效、基于数学变换的经典设计方法、基于状态空间的极点配置设计方法、多变量系统的二次型最优控制、量化效应、采样周期的选择、数字控制系统的建模问题、数字控制系统的各种设计方法、变量系统的二次型最优控制、采样周期的选择、非线性控制的有关问题，以及数字控制系统的一个典型应用——磁盘驱动器的伺服控制设计等。

The development direction changed direction according to the four-wheeler, the domestic and international company changes direction organization to control to the four-wheeler currently main adoption of is a numeral control, this is owing to a lot of advantages of numerical control:the procedure turn a control, the controller carries on the processing of operation and numerical information according to the control regulation designed, mainly passing procedure to carry out, if change control regulation need to change software, but need not change the hardware structure of system: control the accuracy is high, in the emulation the control the system, the accuracy of the controller from the accuracy of the component but settle, numerical controller accuracy from word long decision;Stability good;The software replies to use, needing a hardware environment of using the homology realization in the emulation the system, the numerical controller is a procedure control, the sub- procedure mold piece which need to be designed and write to carry out its model, can immediately carry out several links of functions expediently.

目前各个厂家大多采用的是PLC、单片机应用于四轮转向控制器中，功能基本能够实现，相比较之下，信号处理能力较强的数字信号处理器各方面均性能优于以上三种处理器。DSP是新世纪数字化革命的核心。它是一种独特的微处理器，具有可编程性，且实时运行速度远远超过通用微处理器。强大的数据处理能力和高速的运行速度，是DSP最值得称道的两大特色。DSP芯片是一种特别适合进行数字信号处理的微处理器。它强调运算处理的实时性，因此除了具备普通微处理器所强调的高速运算和控制功能外，主要针对实时数字信号处理，在处理器结构、指令系统和数据流程上做了很大的改动。它具有灵活、精确、可靠性好、体积小、功耗低和易于大规模集成等优点。

At this text I bring forward effective project strategy of non-maturity haleness watermark model arithmetic. Making use of time-frequency local characteristic of wavelet switch, I bring forward digital image watermark insetting project basing on block of wavelet switch, at the first ,make the image disporting to block of 8×8,then make use of the characteristic of Haar wavelet switch,then make the image the second layer wavelet switch and carry through power modulus transaction.

本文提出了非完备性鲁棒性数字水印典型算法中的行之有效的设计策略，利用小波变换良好的时频局部特性，提出了基于块的小波变换的数字图像水印嵌入方案，把宿主图像分为8×8的小块，利用 Haar小波变换的特性，对图像进行二层小波变换分解，对变换系数进行权重处理，然后把每一个水印象素隐藏在相应的图像块的中低频小波系数之中，提高了数字水印的隐蔽性和鲁棒性。

The method comprises the steps of: constructing a testing system which inputs digital codes and outputs simulated values of the analog-digital converter; obtaining a comparison table which is output through inputting responded simulated values of different digital codes from 0 to 2N-1 of the analog-digital converter; calculating to obtain an integration non-linear error comparison table corresponding to different digital code input of the analog-digital converter; compensating integration non-linear errors of the analog-digital converter through a hardware compensating method of adding a subtracter; and obtaining accurate analog-digital converter output.

搭建数模转换器的数字码输入-模拟值输出的测试系统；获得数模转换器从0到2 N -1的不同数字码输入响应的模拟值输出的对照表；计算得到数模转换器相应于不同数字码输入的积分非线性误差的对照表；通过加入减法器的硬件补偿方法，补偿数模转换器的积分非线性误差，获得准确的数模转换器输出。

The bulk seven is considered lucky by gamblers, numerologists and the slew of couples who chose Saturday as theirss wedding date.

&7&被赌徒、数字命理学家视为幸运数字，很多新手者也将上周六定为她们的姻缘日。

These methods will be applied to the design of oscilloscopes, digital oscilloscope measurements can be realized weak signal functions.

将上述方法运用到数字示波器设计中，可增加数字示波器测量微弱AM 信号的功能。

This can be seen in terms of its concept setting, historical development and present condition.

从数字图书馆个性化服务的概念、历史及现状着手，论述了个性化服务的必要性、服务方式、存在问题以及实行时需注意的事项，提出随着数字图书馆不断完善，它就能满足不同用户的需求，为图书馆的生存与发展带来了新的思路与希望；随着科学与信息技术的不断进步和图书馆服务概念的更新，数字图书馆个性化服务必将有一个广阔的未来。

Lining figures: A design of arabic numerals in general use.

齐线数字：常用的阿拉伯数字设计。

Always can use an arabic numerals and very decent place all should use an arabic numerals.

梗概： 凡是可以使用阿拉伯数字且很得体的地方均应使用阿拉伯数字。

Training in methodologies for planning digital libraries and the use of free software for their creation will be provided from 21 to 25 February 2005 in Fortaleza, Brazil, during a workshop organized by UNESCO, the Federal University of Ceará, Brazil , and the Centre for Training and Development in Fortaleza.

2005年2月21日到25日，数字图书馆计划方法论以及使用自由软件建立数字图书馆培训在巴西福塔莱萨举行；期间，由联合国教科文组织、巴西塞阿拉州联邦大学（Federal University of Ceará）和培训发展中心（Centre for Training and Development ，CETREDE）组织的一个研讨会同时在福塔莱萨举行。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。