基于SDN和NFV的5G移动通信网络架构的设计思路

5G移动通信网络是一种以"用户需求"为出发点的新型融合性网络,它的主流技术就是SDN技术和NFV技术。y文章分析了SDN技术与NFV技术的应用优势,基于此,提出了基于SDN与NFV的5G移动通信网络架构的设计思路,并设计了5G移动通信网络架构,促使网络能力的开放性发展,提升网络容量、传播独立以及时延性能。     

基于区块链的联邦学习应用研究

联邦学习区块链应用领域、架构特性和隐私机制等,具有很强的互补性和兼容性。将这两种技术结合起来,以增加隐私保护。数据交换是在计算性能的机制进行。基于区块链的联邦学习,了解有关开发基于区块链的联邦学习最新研究成果。人工智能离不开大数据,由于目前的数据管控政策和行业竞争造成的数据孤岛严重限制了大数据技术的使用价值。联邦学习可以消除数据孤岛,在多个参与者不公开数据集的情况下,共同完成模型学习。由于中心化的相互依赖,以及隐私泄露的风险,基于区块链的联邦学习方法已进入人工智能研究领域。基于此,本文讨论了联邦学习和区块链的概念,结合区块链和联邦学习进行了分析。     

车联社会网络综述

车联社会网络是一种融合了社会科学与无线通信技术的移动通信网络,旨在为车载用户提供基于社会关系的数据投递服务。在分析国内外移动社会网络及车载网络研究现状基础上,提出了车联社会网络的基本架构及其典型应用,深入分析了车载网络与社会网络之间的关系,探讨了车联社会网络中信息投递、带宽分配、分布式存储和安全隐私等技术中存在的关键问题及其解决策略,最后讨论了该领域中新的研究方向与挑战。     

面向未来移动通信的核心网架构

伴随着信息化技术的快速发展,移动通信网络处于快速创新和发展阶段,移动通信的核心网架构逐渐成为移动通信领域发展的必然方向。对此,文章提出一种基于虚拟化以及SDN的虚拟核心网架构,并借助该架构简化核心网的接口以及协议,并融合业务链的处理,引出智能化的管理模块,实现多元化的功能。     

移动交换平台的智能化发展

我国的移动通信技术已经进入了快速发展的阶段,从早期的技术发展到现在的3G、4G网络技术,基于移动通信的各种应用层出不穷,人们对移动通信网络的依赖也变得强烈,交换技术作为移动通信的核心技术,可以实现数据的临时存储与转发,在保证基本话音通信的前提下,更需要朝着满足人们不断变化的数据业务智能化平台发展。     

面向卫星通信的6G通感算融合架构、技术与挑战

为了适应第六代移动通信(6G)技术在卫星通信领域的发展需求,亟需将感知、通信、计算(通感算)融合一体化,兼顾6G通信对于极低时延、极高带宽、极低功耗和极高算力的要求,发展通感算融合理论和关键技术。卫星通信凭借其覆盖面积大、成本低和算力强的特点,成为6G通感算融合的关键场景,其通过边缘计算、联邦学习等技术构建6G通感算融合网络,设计实现一体化终端功能结构,从而有效提升系统性能。目前面向卫星通信中的通感算融合研究还处于起步阶段,架构与关键技术的相关研究都在加速进行中。基于此,首先对6G通感算背景和研究现状进行介绍;然后提出面向卫星通信的6G通感算架构,概述其系统功能模块构成和关键技术;接着提出基于联邦学习的卫星通感算融合架构,并详细阐述架构组成和性能指标;最后探讨了面向卫星通信的6G通感算融合面临的挑战和未来的发展趋势。     

基于5G网络的联邦学习架构及关键技术

针对5G网络下的联邦学习架构及关键技术展开研究，通过5G网络的帮助来提升移动终端收集的小样本数据对于训练全局模型的重要意义。从具有不同本地数据集的终端可以加速模型训练和增强模型泛化能力的理论分析入手，详细阐述了如何利用5G系统优势，实现在通信资源约束下选择具有典型特征的终端成员，从而达到联邦学习效果最大化的目的。基于3GPP 5G系统现有架构，提出了支持联邦学习的5G架构以及典型解决方案流程，最后给出了仿真结果，证明了5G网络对于联邦学习具有良好增益。     

5G:智能移动通信1.0

移动通信发展的下一阶段是智能化:即移动通信网络技术从蜂窝网络走向协同异构智能融合网络,移动通信无线传输技术从提高传输速率走向提高传输能力,并实现移动通信技术与智能计算、云存贮、大数据、虚拟现实等信息技术的高度结合。5G将启动标准化进程,开启移动通信智能化时代。5G是智能移动通信的1.0,移动通信智能化将持续几十年或更长。     

未来移动通信网络架构的发展趋势

目前5G技术的研究在全球ICT的范围内受到广泛的关注,其需求愿景及5G整体架构的方案研究都取得了重要的阶段性进展。基于未来移动通信网络架构的发展趋势分析其所涉及的关键技术SDN、NFV。信息感知技术和ICN及其在网络发展构架上的重要作用。本文从当今移动通信技术的热点及国外移动通信的现状和其发展情况出发,并从多个角度分析了我国目前移动通信网络遇到的问题,进而指出我国未来移动通信网络的发展趋势。     

基于联邦学习模型的电力客户隐私保护方法

为提升电力物联网中用户数据安全性，提出了电力物联网LDP联邦学习框架。该框架将物联网用户分为常规用户和敏感用户两部分。常规用户通过与电力供应商互通模型与数据，基于横向联邦学习技术学习局部模型并参与更新全局模型；敏感用户利用异构联邦迁移学习技术将全局模型关联到局部模型中，从而保证敏感用户数据安全性。将联邦学习框架应用于GRU、LSTM网络，验证了所提联邦学习框架能够提升网络性能。     

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.