以IMS为核心的下一代融合业务网络

引言 鉴于IMS在未来融合网络中会话控制的核心地位,其成为移动和固定网络发展中的热点,本文阐述了IMS融合网络的体系结构和特点.IMS体系中业务和控制分离更加彻底,IMS只是完成会话控制功能,提供开放接口给上层应用,开放、融合的业务架构可快速提供新业务.本文阐述了IMS业务提供架构、POC和PTX业务和业务运营.     

IMS业务体系架构中业务触发机制分析

分析了IP多媒体子系统(IMS)业务体系结构中的业务触发机制,包括业务触发数据、S-CSCF上的处理流程等,结果说明,该触发机制保证用户发起IMS呼叫时能够正常使用IMS业务体系结构中所提供的业务.     

3GPP组织的IP多媒体子系统研究

基于3GPP IMS的网络架构支持固定网络接入需求和未来网络的各种业务需求,有利于实现未来固定、移动网络在核心业务控制层的共享和融合,并提供对高层多种业务的支特．已经成为下一代网络的发展方向。介绍了3GPP IMS的体系结构和工作原理,并对3GPP IMS的业务模型与业务提供能力进行了分析。     

3GPP IMS研究

基于3GPP IMS的网络架构支持固定网络接入需求和未来网络的各种业务需求,有利于实现未来固定、移动网络在核心业务控制层的共享和融合,并提供对高层多种业务的支持,已经成为下一代网络的发展方向。本文介绍了3GPP IMS的体系结构和工作原理,并对3GPP IMS的业务模型与业务提供能力进行了分析。     

IP多媒体子系统框架结构研究

基于IMS的网络架构支持固定网络接入需求和未来网络的各种业务需求.有利于实现未来固定.移动网络在核心业务控制层的共享和融合,并提供对高层多种业务的支持,已经成为下一代网络的发展方向.介绍了中期体系结构和远期体系结构.然后引入了IMSR00参考体系结构,最后对IMS主要实体,接口与参考点进行了分析.     

IMS的初始过滤准则和业务提供技术研究

IP多媒体子系统(IMS)是下一代网络的核心技术,是被业界认可的实现移动和固定网络融合的理想方案。介绍了IMS的业务体系架构、初始过滤准则(iFC)和基于IMS的业务提供技术,并在实际的系统中进行了实现。实验结果表明,该触发机制保证用户发起IMS呼叫时能够正常使用IMS业务体系结构中所提供的业务。     

CATV网络接入IMS控制的核心网的体系结构

由于IP多媒体子系统（IMS）的特征是采用SIP协议进行呼叫控制、与接入无关和能够提供多种业务，3GPP、ETSI和ITU-T等组织都在研究基于IMS架构的下一代网络（NGN）。在介绍IMS体系结构、有线电视（CATV）网络改造实现IP通信的基础上，提出CATV网络接入IMS控制的核心网的体系结构。     

HSS架构及安全性分析

多媒体子系统(IMS)是最初由3GPP制定的,用采提供实时和非实时的IP多媒体业务的通用体系结构.归属位置寄存器(HSS)是该系统的数据中心,是支持用户移动性和呼叫控制的关键.文章介绍了IMS网络中HSS的功能结构,并着重对其安佥性进行了分析.     

IMS业务架构研究

3GPP在UMTS R5中提出的IP多媒体子系统(IMS)采用无线技术，能使任何移动用户能随时随地享用到Internet业务，UMTS前面版本中提出的PS域也可提供实时多媒体业务，但PS域是在没有QoS条件下，提供尽力而为的服务，这样导致了实时多媒体会话的质量难以保证。R5中提出的IMS在以下三个方面进行了改善：QoS．计费和对不同业务的融合，为进一步在PS域上开展新业务提供了很好的平台基础。本文主要对IMS系统的网络结构进行了详细分析．包括实现IMS处理多媒体会话控制的各种功能单元，并在此基础上研究了IMS的业务框架。     

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。     

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.