北京启动DAB手机电视服务挑战原有模式

自9月6日起,北京人民广播电台DAB移动多媒体广播业务正式面向全市用户启动,北京六环路以内地区也首次实现了DAB移动多媒体信号的全面覆盖。这意味着继去年上海文广与中国移动正式开通手机电视“梦视界”之后,北京也开始利用地面数字广播技术尝试手机电视业务了。     

MBBMS启动中国移动"第五媒体"时代

作为移动多媒体的重量级应用,基于广播技术的手机电视业务一直是业界关注的重点,因为这种技术不仅能使基于广播方式播出的视频流在手机上的应用像电视那样普及,同时还能变得可运营、可管理。历经两年打拼,中国移动携手国内7大企业共同研发的MBBMS(MobileBroadcastBusinessManagementSystem)手机电视系统正在让这种期待变成现实。     

一种基于CMMB的蓝牙实现方法的研究

本文概述了当前手机电视的主要方法,提出了一种新的基于中国移动多媒体广播的收看电视节目方法。该方法充分利用了蓝牙无线传输的特性,通过中国移动多媒体广播／蓝牙网关,在蓝牙手机上收看中国移动多媒体广播平台播送的电视节目,从而达到收看电视节目的目的。     

MBBMS启动中国移动“第五媒体”时代

作为移动多媒体的重量级应用，基于广播技术的手机电视业务一直是业界关注的重点，因为这种技术不仅能使基于广播方式播出的视频流在手机上的应用像电视那样普及，同时还能变得可运营．可管理。历经两年打拼，中国移动携手国内7大企业共同研发的MBBMS（Mobile Broadcast Business Management System）手机电视系统正在让这种期待变成现实。[编者按]     

手机电视业务的发展现状与未来

2006年10月，国家广电总局正式颁布了具有我国自主知识产权的中国移动多媒体广播（俗称手机电视）行业标准，确立了今后大规模市场推广的基础。该标准（简称CMMB）规定了在广播业务频率范围内，移动多媒体广播系统广播信道传输信号的帧结构、信道编码和调制，适用于在30MHz到3000MHz频率范围内的广播业务频率，通过卫星和／或地面无线发射电视、广播、数据信息等多媒体信号的广播系统，可以实现全国漫游，传输技术采用STiMi技术，并于同年11月1日起实施。     

新闻点点评

■新闻■我国手机电视标准正式颁布10月24日,国家广播电影电视总局今天颁布了自主研发的中国移动多媒体广播行业标准,确定采用我国自主研发的手机电视技术标准StiMi。该标准用于开展移动多媒体广播业务,面向各类移动便携式终端,提供广播电视节目和信息服务,该标准的实施将会填补广播电视在移动接收方面的服务空白。据介绍,该标准是中国“产、学、研”等部门多年联合开发研究的结果,具有完全自主知识产权,对中国移动多媒体广播和民族工业的发展具有重要意义。点点评:我的标准,我做主!■新闻■联想方正牵头26家企业密造WAPI关键链条由联想…     

移动多媒体广播业务的应用层技术与标准

移动多媒体广播／手机电视业务是跨领域不同技术相结合的一种移动数据业务。本文主要对移动多媒体广播／手机电视业务的应用层的主要技术，及其相关国际标准进行了分析，并提出国内标准化的建议。     

国际手机电视技术现状研究综述

介绍了手机电视技术特点,并比较了3种实现方法.重点阐述了多媒体广播组播业务,DVB-H,T-DMB,S-DMB等技术方案.最后,分析了手机电视技术所面临的一些问题.     

全球手机电视技术及业务分析

随着全球3G商用进程的日益推进，手机电视业务受到了业界的广泛关注。近几年来，全球一些移动运营商相继推出了手机电视业务，他们大多采用的是基于蜂窝网络的流媒体技术。2005年1月，韩国SKT卫星数字多媒体广播（S—DMB）业务推出后，基于数字广播电视网络的手机电视业务开始快速发展。     

构建可运营的广播式手机电视业务

广播式手机电视业务具有广阔的市场前景,中国移动研究院自主设计开发的广播式手机电视业务管理系统（Mobile Broadcast Business Management System,MBBMS）将移动通信网络与广播网络相结合．实现了广播式手机电视业务的可运营、可管理。     

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.     

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.     

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.     

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.     

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.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.