开放互联网环境下电信运营商视频业务技术演进策略

首先论述了视频业务对电信运营商的重要性,结合电信运营商视频业务运营的探索和实践,分析比较了IPTV、OTT TV、IPTV+OTT融合架构等体系架构的产生背景和优劣势,在此基础上提出,既吸取OTT TV开放化、智能化的特点,又保持IPTV可运营、差异化网络优势的“互联网化IPTV”是电信运营商视频业务技术架构的演进方向,并针对视频编解码、流传输、CDN、多播、用户交互界面、端到端质量保障等关键技术提出技术发展策略.     

广电网络融合视频分发系统架构规划研究

面向大视频时代VOD业务与OTT业务的融合分发趋势,提出了一种广电网络融合视频分发系统(CDN)的设计架构,对内容注入/分发机制、视频点播机制、全局调度机制、认证鉴权机制进行了阐述,并初探了CDN系统的信息安全体系构建.     

三网融合流媒体技术应用探讨

随着固定互联网和移动互联网技术的发展以及国家三网融合规划快速推进,使得开展三网融合视频业务成为可能.结合黑龙江联通的核心流媒体业务平台现状,提出基于现状实现三屏视频互动业务的方案,同时提出规划架构方案,为推进三网融合业务建设抛砖引玉.     

视频中台与边缘云技术融合应用的研究与实践

随着我国互联网建设不断发展，当前视频业务对计算、存储、时延等各方面能力的需求也在飞速增长。针对这一现状，提出一种基于边缘云架构的视频中台解决方案，重点介绍视频中台这一新生业务形态的建设思路以及各基本功能点的要求，并从实例出发，阐述视频中台与边缘云技术相融合的应用价值以及在应用中的主要考量因素和总体成效。     

基于云网融合的大视频业务平台网络规划与建设策略研究

随着终端计算和图形处理能力的增强、网络性能的持续提升,视频已成为人们信息交互的重要媒介.结合用户对视频业务的清晰度、流畅性和实时交互等体验指标需求,研究和分析了大视频业务与云网融合发展的内在关系,提出了新时期大视频业务平台、网络架构、规划与建设策略.     

面向固移融合视频业务的平台研究

随着4G网络的大规模建设,网络质量不断提升,移动视频用户呈井喷之势,固移融合将成为趋势。视频业务,将和4G,宽带一起全业务融合发展,成为移动抢占家庭入口、实施移动和家庭战略的抓手业务。文章针对运营商视频的发展情况,探讨了面向固移融合视频业务平台建设的迫切性。通过对融合视频平台技术方案多层面进行对比,提出面向固移融合视频业务平台推荐方案和功能架构,以期对运营商构建融合视频平台起到指导和促进作用。     

中兴通讯首发基于IMS的网真系统

2009年11月27日,中兴通讯在2009"IMS技术峰会"宣布全球首个IMS高清视频会议系统在中国移动正式商用,并同时发布业界第一款基于IMS的网真系统-IMS"幻真"TrueSee远程呈现系统. 向IMS架构演进是全业务运营网络的发展方向,IMS灵活的业务网络架构支持快速的业务分发和生成,实现固定移动融合.     

大视频业务来袭电信运营商该如何进行网络规划?

近几年“宽带中国”、“提速降费”等国家战略陆续落地,新媒体和视频技术不断成熟,以4K/8K、VR等为代表的大视频类业务需求日益旺盛,随着此类业务的逐步发展应用,对网络带宽的需求也不断增长,可以预见未来大视频类业务应用是拉动运营商网络流量高速增长的主要驱动力,对运营商网络的接入带宽、承载容量、网络架构提出更高要求.     

“去电信化”融合视频通信产品方案分析

从网络实现架构、业务开通方式、功能、可靠性、接入协议、号码、QoS、终端、与现有业务的互通性等多方面对互联网模式的视频通信和运营商实现的IMS视频通信进行了详细对比分析,提出了"去电信化"是影响运营商视频通信业务成功的关键要素,即终端非定制化、体系架构开放化、管理流程互联网化、部署集中化、运营集约化等,并在此基础上,对运营商如何提供融合视频通信的产品实现方案、产品形态以及推广策略给出了初步建议。     

新一代集成智能数字前端

有线运营商作为三网融合的运营主体,视频业务是其最重要的发展方向.在此背景下,有线运营商需要对现有前端进行改造,部署新一代集成智能前端服务于多重业务与应用.作为路由交换与视频技术的领导者,思科公司在新一代集成智能前端架构的设计、部署中具有领导性的地位,在此,我们提出新一代集成智能前端的推荐架构.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks