MPEG-4标准系统部分初论

对ISO／IEC14496的第一部分MPEG－4系统作概要论述。先从MPEG－4的整体结构分析出发,分别描述了MPEG－4系统中的主要工具,包括对象描述框架、场景的二进制描述、定时和同步等,最后归纳了MPEG－45系统的一些关键特性,并展望了其今后的发展。     

PCR域的校正及在MPEG-2复用器中的实现

在研究MPEG－2标准的时间模型的基础上,分析了MPEG－2系统不恒定延时的原因,并提出了一种在多路复用器中保持恒定延时的PCR域的校正方法,并在MPEG－2复用器中准确实现。     

移动卫星信道中的视频传输

为向远程便携通信提供低速率的视频服务，提出了一种基于卫星信道的级联编码系统，该系统综合运用了实时信道估计、软判决译码、TCM、深度交织和纠错编码等技术，它不仅可用于语音通信，也适用于MPEG－4标准的图像传输。     

MPEG—4终端的系统组成及特点

从MPEG－4系统的分层结构出发，介绍了场景描述、交互性、基本流和同步机制等关键技术问题。叙述了各层所涉及到的基本功能和一些常用的MPEG－4系统工具。最后展望了MPEG－4系统在IP上的发展。     

基于HFC网络视频点播系统MPEG-2 TS传输的实现

MPEG－2传输流（MPEG－2 TS）的传输问题是视频点播系统中的关键技术。分析了MPEG－2传输流的结构特性，详细讨论了基于HFC网络视频点播系统MPEG－2 TS传输的实现。     

MPEG-2/DVB解码器芯片CX24430及其在数字电视机顶盒中的应用

数字电视机顶盒（STB）实现接收数字电视和接入Internet网络两种基本应用功能，传统的解决方案必须由两种主要芯片来完成。CX24430是机顶盒设备的核心芯片，它集成了一个Cable Modem和一个互动电视MPEG解码器，由单芯片来代替两种芯片，因此可以减少系统的软硬件开销，降低系统的成本开支。介绍CX24430的主要特点、内部结构及其典型应用。     

多媒体系列标准MPEG的发展研究

通过对MPEG－1到MPEG－21发展过程的分析，详细论述了MPEG系列标准的技术原理及应用领域；并对MPEG－4，MPEG－7和MPEG－21标准的主要技术进行了重点研究。     

MPEG视频的发展趋势

随着技术的发展，为了便于视频市场的健康发展，MPEG标准包括MPEG－1、MPEG－2、MPEG－4、MPEG－7和MPEG－21。MPEG在商业上取得了成功的应用，并将商业的需求转为相应的技术规范，目前MPEG标准继续深入发展。本文将主要从MPEG视频的发展历史探讨其今后的发展趋势。     

基于ARMulator扩展的AMBA总线及性能分析

系统芯片面临的重大挑战在于设计之初对软硬件进行划分,并对系统的性能评估。针对这一挑战,阐述在ARM指令集模拟器基础上扩展片上总线(AMBA)模型、SDRAM控制器模型和SDRAM模型。实验结果显示,对MPEG4解码算法进行软硬件划分,采用模型可以准确地评估MPEG 4解码系统的性能和功耗。     

MPEG-4视频编码算法研究

MPEG－4由于引入视频对象（VO）和基于内容的存取概念而为多媒体信息处理提供了广阔的应用平台。系统地分析了MPEG－4视频编码算法，并形象地解释了MPEG－4视频标准的一些关键概念。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first