IEEE802．16g：2007和IEEE802．16k：2007标准研究

分析了WiMAX标准的分类方法、标准名称、通过时间、发布时间和当前状态,并从参考模型、网络控制与管理系统、网络参考模型、通用分组汇聚子层和媒质无关切换等方面对WiMAX最新标准IEEE 802.1 6g:2007标准进行了研究.最后详细介绍了IEEE 802.16k标准的原理和应用.     

WiMAX最新标准研究

WiMAX得到了业界的广泛支持,其标准化进程不断推进.本文首先分析了WiMAX标准的分类方法、标准名称、通过时间、发布时间和当前状态,并从参考模型,网络控制与管理系统、网络参考模型,通用分组汇聚子层和媒质无关切换等方面对WiMAX最新标准IEEE 802.19g-2007标准进行了研究.最后,对IEEE 802.16k标准的原理和应用进行了详细介绍.     

IEEE 802.16g-2007标准研究

WiMAX得到了业界的广泛支持,其标准化进程不断推进。本文首先分析了WiMAX标准的分类方法、标准名称、通过时间、发布时间和当前状态,并从参考模型、网络控制与管理系统、网络参考模型、通用分组汇聚子层和媒质无关切换等方面对WiMAX最新标准IEEE 802.16g-2007标准进行了研究。     

WiMAX系统架构以及无线资源管理机制

研究了基于IEEE 802.16标准的WiMAX系统架构,给出了端到端的网络参考模型,并就当前WiMAX网络标准现状进行了介绍,特别是详细阐述了WiMAX系统的无线资源管理机制的体系结构,对其中的关键算法进行了详细研究.     

基于IP的WiMAX移动网络的研究

基于IEEE 802.16的WiMAX网络的应用正成为业界的讨论热点,IEEE 802.16m更被选为下一代无线通信标准（IMT-advanced）的候选方案之一。在此深入探讨构建基于IP技术的WiMAX应用网络架构。首先分析IEEE 802.16e规范为支持移动性在物理层和媒质接入层引入的增强技术。随后基于移动IP技术和WiMAX网络参考模型给出基于IP的移动WiMAX网络的可行的应用模型。该应用方案可为基于IEEE 802.16技术的应用提供一个参考。     

WiMAX标准化进展

WiMAX得到了业界的广泛支持,其标准化进程不断推进.文章首先分析了WiMAX标准的分类方法、标准名称、通过时间、发布时间和当前状态,并从空中接口标准、一致性标准和共存标准三方面对IEEE 802.16系列标准的最新发展进行了研究.     

WiMAX技术讲座 第4讲 WiMAX网络架构简介

本文分析了WiMAX网络的体系结构,介绍了WiMAX网络的参考模型,最后对WiMAX网络的主要功能进行了描述。     

WiMAX组网问题及相关探讨

运冒模式是一道关卡数字城市基础建设不可忽略 2007年ITU批准WiMAX即IEEE 802.16e成为3G补充标准.极大地推动了WiMAX的商用网络建设,在全球超过118个国家得到商用部署.与此同时,WiMAX又宣布启动对口IMT-Advariced发展计划的IEEE 802.16m标准研究工作.WiMAX红极一时.2008年之后,英特尔削减了研发投入,北电宣布放弃WiMAX业务,全球主要厂商缩减WiMAX相关开支.WiMAX凉了半截.     

IEEE 802.16标准与WiMAX技术浅析

本文首先介绍了WiMAX的技术基础IEEE 802.16系列标准的制定及发展现状,并着重对该标准的媒体访问控制子层和物理层的技术特点进行了分析.文章将用于构建WLAN的IEEE 802.11系列标准与用于构建WMAN的IEEE 802.16系列标准进行了比较.在文章最后,作者描述了WiMAX技术的应用场景,尝试性提出了WiMAX的几点应用并对该项技术做了展望.     

IEEE 802.16标准和WiMAX组网技术分析

本文详细介绍了IEEE 802.16各种协议标准,比较了各种WiMAX的物理层技术,分析了WiMAX、Wi-Fi和蜂窝系统的各种优劣,重点阐述了WiMAX的组网方案,根据尽量对目前正使用网络兼容和补充的原则,提出了WiMAX组网分3阶段进行的策略,并且给出了每阶段的详细组网方案.     

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.