数字

The article takes balancing all quarter copyright benefit as discussion entrance, analyses the questions of copyright benefit management, and proposes strategies to constructing benefit management mechanism of the digital copyright public interests management and the copyrighter's interests. in the end, the author thinks we should construct a kind of digital copyright benefit management mechanism which regards policy as a guide, takes the law as criterion, regards protection as the means, and takes utilization as goal, based on interests equilibrium. the management mechanism will stimulate creation, maintain interests fair, advance resources utilization, and promote culture art thriving.

文章以平衡各方利益为切入点，在分析当前数字版权利益管理中存在的问题的基础上，从数字版权的公众利益管理和数字版权人利益管理两方面入手，详细分析了各自管理机制构建策略，认为数字版权领域里应该构建一种以政策为先导、以法律为准绳、以利益平衡为基础、以合理保护为手段、以利用为目标的刺激创作、维护公平、推进共享、促进文化科学艺术繁荣的公众利益与私人利益和平共处的管理机制。

The article takes balancing all quarter copyright benefit as discussion entrance, analyses the questions of copyright benefit management, and proposes strategies to constructing benefit management mechanism of the digital copyright public interests management and the copyrighter抯 interests. In the end, the author thinks we should construct a kind of digital copyright benefit management mechanism which regards policy as a guide, takes the law as criterion, regards protection as the means, and takes utilization as goal, based on interests equilibrium. The management mechanism will stimulate creation, maintain interests fair, advance resources utilization, and promote culture art thriving.

文章以平衡各方利益为切入点，在分析当前数字版权利益管理中存在的问题的基础上，从数字版权的公众利益管理和数字版权人利益管理两方面入手，详细分析了各自管理机制构建策略，认为数字版权领域里应该构建一种以政策为先导、以法律为准绳、以利益平衡为基础、以合理保护为手段、以利用为目标的刺激创作、维护公平、推进共享、促进文化科学艺术繁荣的公众利益与私人利益和平共处的管理机制。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

Translated Description: Digital Signage Network in China is about the Digital Signage (digital signage, multimedia information distribution system) and professional research analysts, is the number signs, multimedia information distribution system, information display systems, digital signage, electronic bulletin board system,...

Description：中国数字标牌网是关于数字标牌（digital signage，多媒体信息发布系统）的专业研究分析机构，是数字标牌，多媒体信息发布系统，信息显示系统，数字告示，电子公告系统，。。。

Digital circuit experiment teaching is very important in the electrotechnics and electronics series experiments teaching.

一、我校数字电路实验教学发展的主要历史沿革杭州电子科技大学是浙江省最早开设数字电路的学校之一，早在80年代就开展有关数字电路CAD的教学和科研，同时开设数字电路实验，所处的电工电子实验中心为国家级电工电子实验示范中心，其水平处于国内领先地位。

The basic technology of PKI include encipher digital signature data integrity mechanism digital envelope double digital signature, digital certificate etc.

PKI的基础技术包括加密、数字签名、数据完整性机制、数字信封、双重数字签名，数字证书等。

At last we compare the difference between digital fingerprinting and digital watermark.

介绍了几种经典的数字指纹方案，讨论了数字指纹系统的攻击手段并将数字指纹与数字水印技术进行比较。

On the basis of theoretical analysis of digital holography, the preliminary study carries out through computer simulation and experiments. The main work is as follows:Firstly, on the basis of off-axis Fresnel diffraction, the principles of optical holography and digital holography are introduced. Besides, the theories such as recording digital hologram, numerical reconstruction and the related digital image processing methods are analyzed.

本论文从理论分析、计算机仿真和实验三个方面对数字全息技术进行了初步的研究，主要完成了以下工作：首先，介绍了传统的光学全息术和数字全息技术的基本原理，以离轴菲涅耳全息为例对数字全息的记录条件、数值重现算法、以及相关的数字图像处理方法进行了详尽的理论分析。

Acer digital technologies are now the main product lines: ADSL2 / 2 +, WLAN, VOIP, FWT, will soon market the product has: VDSL2, IPTV STB. In 2001, Acer digital technology on its own development and production of ADSL CPE, through the Ministry of Information Industry of the network detection, the indicators are good; in 2003, the company successfully passed the National Product Quality Compulsory Certification (3C Certification); 2003 December, macro digital technology passed the China Import and Export Commodity Inspection Corporation Quality Certification Center of the ISO9001: 2000 quality system certification assessment, and obtained ISO9001: 2000 Quality Management System Certification. In 2004, Acer digital technology VOIP terminal equipment in the Canton Post ASTRI compatibility testing of the indicators are very good; in August 2004, Acer ADSL terminal equipment into the company through a strict CE certification, obtained in license permits the sale of the European Union.

宏成数字科技目前主要产品线为：ADSL2/2＋、WLAN、VOIP、 FWT，即将投放市场的产品有：VDSL2、IPTV STB.2001年，宏成数字科技自行研制与生产的ADSL用户端设备通过了信息产业部的入网检测，各项指标均优良； 2003年，公司顺利通过了国家产品质量强制性认证（3C认证）；2003年12月，宏成数字科技顺利通过了中国进出口商品检验总公司质量认证中心的ISO9001：2000质量体系认证的评审，并获得了ISO9001：2000质量管理体系认证证书。2004年，宏成数字科技的VOIP终端设备在广州邮科院的兼容性检测中各项指标非常优秀；2004年8月份，宏成公司ADSL终端设备通过了严格的CE认证，获得了在欧盟销售许可的通行证。

In this dissertation, digital lock-in detection techniques under integer period sampling and non-integer period sampling are separately investigated (1) Under integer period sampling, digital signal sequence is acquired through sampling the measured signal, but digital reference sequence is acquired through mathematical operation, then digital lock-in detection can be realized by calculating crosscorrelation function of digital signal sequence and digital reference sequence Harmonic measure is also analyzed, and a method of measuring harmonic of a periodic signal under aliasing is put forward.

本文对使用采样ADC把模拟信号转换为数字信号并通过计算数字信号的相关函数来实现锁定检测的技术进行了研究，在此基础上设计了一个多功能的数字LIA并在一些科学实验中进行了应用。本文对整周期采样和非整周期采样时的数字锁定检测技术分别进行了研究。(1)在整周期采样时，对被测信号进行采样得到信号序列，而参考序列由数学运算得到，通过计算信号序列和参考序列的互相关函数就可实现锁定检测。

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。