基于模糊神经网络的异构无线网络接入选择算法

针对现有异构无线网络基于模糊逻辑及神经网络的接入选择方法未能合理考虑网络负载状况的问题,提出一种基于RBF(径向基函数)模糊神经网络的接入选择方法.该方法以可接入网络的接入阻塞率相等为模糊神经网络参数强化学习的目标,对网络负载程度具有很好的动态适应性,实现了智能化的接入判决.仿真结果表明,该方法能有效均衡异构无线网络间的负载,保障实时与非实时业务的QoS,并且相对于负载均衡算法(MLB算法)降低了网络的接入阻塞率.     

基于多种异构网络的多链路并行最优网络传输技术

本文提出了一种基于多种异构网络的多链路并行最优网络传输策略,主要包括负载均衡策略,无线网络切换方法,网络设备管理方法,无线网络连接方法.     

下一代异构网络中基于进化博弈论的业务负载均衡

阐述了进化博弈论(EGT)的基本理论和模型，并将其应用于异构(heterogeneous)通信网络的业务负载均衡问题中，给出了一种基于进化博弈理论的异构网络业务分配模型。应用复制动力学的动态学习能力，进化博弈模型中的用户方通过动态调整分配策略，可以获得进化稳定策略(ESS)下均衡的负载分配和改善的期望效用(utility，或适应度fitness)。计算机仿真结果从负载分配的稳定、均衡和改善的平均期望效用三个方面验证了进化博弈模型在异构网络负载均衡问题中的有效性。     

一种软件定义无线网络负载均衡架构及算法

软件定义网络( SDN)为实现异构无线网络中的负载均衡提供了新的思路。设计了一种软件定义的无线网络负载均衡架构,并提出对应算法。首先,根据接收信号强度构建候选网络列表;其次,根据各候选网络的可用负载比率标准差进行负载差异分级;再次,将服务质量匹配度函数和负载均衡指数线性组合成联合优化函数,并根据负载差异分级对联合优化的权重进行动态调整,合理设置门限进行接纳控制。与传统算法相比,所提算法一方面可使各类业务阻塞率明显降低大约20%,另一方面使不同网络的归一化负载更加接近。该算法在进行网络负载均衡的同时,能够有效降低业务阻塞率,从而有效提升异构无线网络的整体性能。     

面向异构网络的动态负载均衡算法及其收敛性分析

资源共享是分布式计算的核心问题,平衡负载是实现资源共享的基本手段。现有的负载均衡算法多局限于同构网络,伴随计算终端多元化的发展趋势,面向异构网络的负载均衡需求也不断增加。该文基于经典的扩散算法,提出一种适用于异构网络环境的新的动态负载均衡算法,并通过严格的数学方法证明了算法中各结点可收敛于平衡点。实验结果表明,该算法的收敛性能优于Rotaru等人(2004)提出的GDA算法,并且对于网状网络、星型网络和花环网络等经典结构都有良好的收敛性,即便在随机生成的网络结构中,仍然保持了较快的收敛速度。     

CPU和GPU混合集群的负载均衡策略

为了充分利用GPU集群(Cluster)中各节点的资源,提高GPU集群(Cluster)整体的计算效率.本文以3G网络中海量视频质量分析为研究背景,提出了一种面向CPU和GPU集群的负载均衡策略,构建了一个GPU异构集群系统.实验表明,该负载均衡策略能很好地利用GPU和CPU计算资源、提高集群计算效率.     

异构无线网络多用户多业务接入中多目标优化控制方法研究

针对多异构网络重叠覆盖、多用户多业务共存环境下,用户最大化传输速率易致网络负载不均衡的问题,提出一种基于非支配排序遗传算法的业务接入控制方法。该方法首先以传输速率最大化及网络负载最均衡为目标,以带宽资源受限为约束,构建了传输速率最大化及网络负载最均衡的双目标优化模型;然后基于多目标优化方法非支配排序遗传算法(Non-dominated Sorting Genetic AlgorithmⅡ,NSGA-Ⅱ)求解该业务接入控制问题。仿真结果表明,所提算法兼顾了用户的传输速率需求及网络间的负载均衡,取得较好的效果。     

无线通信网络中的负载均衡技术研究

对当前无线通信网络中的负载均衡技术进行分类分析综述,并分类进行技术特点的研究,主要内容涵盖了基于无线资源管理的负载均衡研究、基于切换的负载均衡研究以及基于小区选择或重选的负载均衡研究,通过研究这些技术的特点以及分析未来无线通信的发展,指出该技术在未来无线通信网络中可能的研究方向。     

网络收益最大化的异构无线网络呼叫接纳控制

为有效降低异构无线网络拥塞,提高网络收益,提出了网络收益最大化的呼叫接纳控制(Call Admission Control,CAC)算法。首先模拟异构无线网络场景,考虑网络带宽及时延参数,定义网络收益函数,其次解决网络收益最优化问题。仿真结果显示,该算法可以高效地降低网络拥塞,均衡负载并提高网络收益。     

基于5G无人机通信的多智能体异构网络选择方法

摘 要：5G无人机通信网络和各种不同无线接入技术的结合使无线异构网络呈现多样化的发展趋势。然而，用户繁多且不同的业务请求对网络要求也不同，造成网络接入选择问题。提出了一种基于5G无人机通信的多智能体异构网络选择方法，将用户分为多个智能体，从用户端和网络端两个方面出发，将用户侧的时延和传输速率需求与网络侧的负载均衡需求综合考虑作为即时回报的相关参数，通过基于Nash Q-Learning的算法进行学习，得到异构网络环境下的网络选择决策模型。仿真结果表明，所提异构网络选择方法针对不同业务类型用户的需求均能选择合适的网络，同时均衡网络的负载，充分利用异构无线网络的资源。     

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