全程实时程线的冷链NEC的RFID解决方案帮助泰凌实现了国内领先的冷链管理系统

冷链必须是全程的 实时的 作为国内拥有雄厚实力的进口疫苗分销商,泰凌医药集团旗下的海南泰凌生物制品有限公司肩负着一些垒球知名厂商的疫苗产品在中国的分销和冷链配送服务.每当看到专用的冷藏车将一箱箱的疫苗运送到仓库的时候,泰凌人的心中感受到更多的是责任.     

收视价值的迷失 高端人群在远离卫视 2008目睹中国电视之怪现状

近两个月来,本刊网站的论坛里又不太安静。有个叫"高清迷"的香港网友遭到了广东一些网友的质疑。彼此论战的焦点大部分在说香港电视好看或不好看。"高清迷"网友说大陆电视越来越好,水平已经超过香港的电视节目。广东网友们则是缅怀香港电视的辉煌历史。这原本是简单的我说你好你说我好,互相捧场的事情,但是网络的奇妙性在于事情并没有朝积极的方向发展,其结果是吵架不可避免的发生了。外来的和尚是不是会念经,我们先不去管他。重要的是我们要弄清楚自己是怎么回事。本文,是专业电视人对我国各省卫视台做的调查评估。让我们了解一下我国的电视台的现状吧。     

ADSL服务

现在使用ADSL上宽带网的用户是越来越多了,对ADSL设备的维护也成了一个不容忽视的问题.只有维护保养好它,不但让你的"宽带之旅"省心又省力,还能延长其寿命.ADSL的维护可分为软件和硬件两个方面来分析,软件主要是PPPOE协议的问题,和计算机本身的气操作系统,和网卡方面的事情.硬件主要是局端的节点设备,和用户端猫的问题.还有通信的线路等一些因素.     

谁卡住了中国3G的脖子高通公司大中华区前总裁雷鸣告诉你鲜为人知的内幕

热闹了多年,也翻炒了多年,但中国的3G进程到现在仍处于一片迷茫当中。是谁卡住了中国3G进程的脖子？毫无疑问,部分跨国公司设置的高昂专利费是阻碍中国3G步伐前进的一块巨石。2005年4月23日,信息产业部副部长奚国华在参加2005年博鳌亚洲论坛年会时公开表示,跨国公司收取过高3G专利费这一行为导致3G进程缓慢,并呼吁这些跨国公司降低专利费用。奚国华副部长的一席话成为“3G专利谈判受阻”事件的最好注解。据悉,在这场关于WCDMA的专利费谈判过程中,高通公司在其他专利拥有者摩托罗拉、诺基亚、爱立信等同意降低专利费的情况下,谈判最终因高通公司的拒绝接受而搁浅。作为世界最大的通讯市场,中国通讯业的每一步进展都充满着坎坷;作为世界知名的通讯公司,高通公司已演变成CDMA生态圈里的巨鳄,其拥有的1400多项专利足以让人望而却步。这家出售知识产权的公司真的是阻拦中国3G进程的巨石吗?也许,从另一侧面观察,更能了解高通的真实面目。雷鸣先生是高通公司大中华区前总裁,他见证了高通的成长,更熟悉高通的一切事务。到底谁是卡住中国3G脖子的幕后主角?现在,经过雷鸣先生的观察和反思,一件件鲜为人知的事终于曝光在读者的面前。相信看完此文披露的诸多内幕,答案就在你的心中！     

电磁环境对人体健康的危害效应和剂量学中存在的若干问题

高频电磁辐射作用于人体后,一部分被反射,一部分会被人体吸收,被吸收的电磁能量使人体组织内的分子和电介质的偶极子产生振动,媒质的磨擦把动能变为热能,从而导致使人体产生温升的热效应.电磁辐射的功率、频率、波形、环境温度以及人体被照射的部位等因素影响热效应伤害的深度和程度.     

一种适用于协作多点联合传输的自适应PMI反馈方法

作为下一代无线通信系统的关键技术,协作多点传输能够有效降低相邻小区之间的干扰,提高小区边缘用户的频谱效率。在频分双工系统中,其性能依赖于各基站获取的基于有线反馈的信道状态信息的准确性。然而,所有协作基站都获得相同精确程度的信道状态信息会导致用户终端的反馈开销随着协作基站数线性增长。本文关注于如何在性能增益和反馈开销之间取得折中,提出一种适用于协作多点联合传输的自适应预编码矩阵索引反馈方法。用户终端根据不同协作基站下行链路的信道质量指示的相对大小,自适应的用不同的比特数表示不同强度链路的预编码矩阵索引,即用较多比特数表示具有较高信道质量指示的预编码矩阵索引,反之亦然。仿真结果表明,与传统反馈方案相比,该方法在几乎不牺牲频谱效率的前提下,大幅降低了反馈开销。      

中國精神六大重構之五传媒理念重构:信息开放的力量

汶川5·12大地震,这场突如其来的灾难让大半个中国遭受重创.我们每天被迫面对无数死伤的同胞和几乎被夷为平地的城市和村镇,悲痛欲绝的同时却又让我们达到空前的团结,5·12是悲惨的,也是悲壮的.我们感受到了全方位的力量,灾民、政府、同胞……尤其媒体的表现让所有人震撼,电视、广播、网络成为灾难的发言人,成为灾区与整个中国乃至全世界连接的信息生命线.     

ADSL用户需求解决方案

通信技术的进步推动了电信市场的发展,当前ADSL用户的需求旺盛,给北京通信的发展创造了有利的商机,同时也给我们带来一些急需解决的新课题,如何利用北京通信的传统优势克服发展瓶颈、充分满足ADSL市场的需要.本文首先分析了目前阻碍ADSL发展的原因,结合北京通信的实际情况提出了利用语音分配点安装OSLAM设备以解决瓶颈问题的新思路,然后介绍了新研制的多功能有源交接箱的设计特点和应用前景及用户纤光缆交换点的建立储备.最后对采用本文的思路和应用新设备的投资、回报等进行了经济性分析,从而系统完整地提出了一套可行的解决方案和相关实施建议.     

声音的动态处理

声音的动态处理包括压缩、扩展、限制等几个环节.随着音频工作站的普及和数字技术的发展,在音频制作与编辑的过程中,动态处理就越来越显得重要了.本文结合作者的实际工作经验,主要以其中的压缩环节作为出发点,着重探讨了声音的动态处理的理论与实践的运用,并列举了如今我们常用的效果器插件Wave L3和iZotope Ozone的具体应用,对许多缺乏实践的相关工作者提供了很好的参考价值.     

基于模式比较的漏洞分析技术研究

介绍了一种利用厂商发布的漏洞补丁信息分析漏洞细节的方法.该方法的关键是利用PE文件在安装补丁前后的不同,综合运用模式比较的方法建立模式匹配图,从而分析处漏洞的细节以及问题代码.该方法函数比较算法的清晰,以及模式图的差异的直观性,很容易分析出问题代码的位置,从而有效地提高了漏洞分析的成功率.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.