IMS网络架构演进及部署

文章介绍了IMS标准制定进展及发展现状，进一步探讨IMS体系结构及其优点，分析了移动运营商引入IMS网络的演进策略，提出了GSM网络向IMS网络演进的步骤，最后对运营商引入IMS存在的问题进行了探讨，为运营商制定网络演进策略提供参考。     

IMS体系研究与网络架构演进

文章介绍了NGN的发展历程，进一步探讨IMS体系结构及其优点．并在综合考虑业务发展需求和保护运营商现有投资的基础上，分析了移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位，最后提出了GSM网络向IMS演进的方案，为运营商制定网络演进策略提供参考。     

IMS体系研究与网络架构演进

文章介绍了NGN的发展历程,进一步探讨IMS体系结构及其优点,并在综合考虑业务发展需求和保护运营商现有投资的基础上,分析了移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位,最后提出了GSM网络向IMS演进的方案,为运营商制定网络演进策略提供参考。     

IMS体系研究与网络架构演进

文章介绍了NGN的发展历程,进一步探讨IMS体系结构及其优点,并在综合考虑业务发展需求和保护运营商现有投资的基础上,分析了移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位,最后提出了GSM网络向IMS演进的方案,为运营商制定网络演进策略提供参考.     

IMS体系研究与网络架构演进浅议

本文主要介绍了NGN的发展历程,再进一步探讨IMS体系结构及其优点。在综合考虑业务发展需求和保护运营商现有投资的基础上,分析移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位。最后提出了GSM网络向IMS演进的方案,为运营商制定网络演进策略提供参考。     

IMS网络架构演进策略

本文主要介绍NGN的发展历程,并且进一步探讨了IMS体系结构及其优点,在综合考虑业务发展需求和保护运营商现有投资的基础上,分析了移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位,最后提出了GSM网络向IMS演进的方案,为运营商制定网络演进策略提供参考.     

IMS网络架构演进策略

本文主要介绍NGN的发展历程，并且进一步探讨了IMS体系结构及其优点，在综合考虑业务发展需求和保护运营商现有投资的基础上，分析了移动通信网络的演进策略以及IMS在网络融合和演进中的角色和地位，最后提出了GSM网络向IMS演进的方案。为运营商制定网络演进策略提供参考。[编者按]     

IMS对移动增值业务发展的驱动

针对IP多媒体子系统(IMS)体系结构及其特点,结合IMS的业务支持和基于IMS的增值业务,分析了IMS系统对移动增值业务的驱动能力。在综合考虑业务发展需求和保护运营商现有投资的基础上,针对移动运营商引入IMS系统面临的机遇和挑战,对移动运营商在网络演进的大趋势下应做的准备提出建议,为运营商制定网络演进策略提供参考。     

基于IMS的固定移动融合的探讨

分析了国内运营商当前所面临的困境与挑战,阐述了通过引入IMS进行固定移动融合解决当前面临的问题,重点对基于IMS的固定移动融合网络构架和实现固定移动融合的网络演进策略进行了相关的研究和探讨。     

基于IMS的下一代融合网络运营研究

文章在分析IP多媒体子系统(IMS)架构及融合应用模式的基础上,提出了运营商引入IMS所面临的软交换平滑演进、会话启动协议(SIP)兼容性、用户接入及数据库融合、网络运维等五类问题,分析了当前主流的IMS解决方案,并从运营角度探讨了IMS技术下的业务融合策略,运营商在了解IMS特有的商业模式的前提下,应针对不同的目标用户引入IMS,并按阶段有计划的推进。     

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