一种基于HINOC网络动态带宽分配新算法的实现

本文提出一种新型的HINOC动态带宽分配算法,利用令牌桶给各个HM分配令牌,在每个MAP周期都重新进行一次计算,以分配在本MAP周期内HM所需发送的令牌数,并按比例进行截断依次来对HM的数据进行均衡。这样将最大程度的合理分配每个HM的数据发送时间,即保证每个HM分配带宽的公平性又能有效的降低发送时延。     

以太无源光网络动态带宽分配算法研究

动态带宽分配是以太无源光网络的重点研究领域之一,其中光网络单元(ONU)内的带宽分配影响到用户的服务质量.文中在分析已有算法的基础上,提出了一种用于ONU内带宽分配的改进令牌桶算法,即每个分配周期中累积的令牌数取决于ONU分配的带宽,而不是ONU的基本带宽.给出了该算法详细的代码描述,并通过在模拟流量下的仿真,证明了该算法能保证不同类型数据的优先顺序,并能保证各种负载条件下带宽分配的公平性,因此相对于已有算法有更好的适用性.     

扩展令牌桶排队算法的设计与实现

本文提出了一种可以对局域网内IP分配固定带宽的扩展令牌桶算法(etbf),etbf扩展了tbf的令牌桶个数,一个令牌桶控制一个IP,消除了tbf共享带宽的缺点,实验结果表明每一个IP得到的带宽都是固定的,达到了希望的效果.     

一个基于令牌桶的带宽动态分配研究

令牌桶算法是最常采用的一种流量监管方法,广泛的应用于约定访问速率技术、通用流量整形技术以及物理接口总速率限制等技术中。然而,在标准化文件里,令牌桶算法只是应用于一种类型的流量,在基于区分服务的网络框架下,多种类型的流量使用预先分配的固定带宽,容易出现带宽资源闲置的情况。在这篇文章里,提出一种关联令牌桶策略来解决上述问题,该策略以令牌为介质,通过令牌的选择性放置来实现剩余带宽的借用,同时借出令牌的流量类型也获得“补偿承诺”,有效地实现带宽动态分配,保证用户所定制的带宽能得到充分利用。     

扩展领牌桶排队算法的设计与实现

本文提出了一种可以对局域网内IP分配固定带宽的扩展令牌桶算法（etbf）．etbf扩展了tbf的令牌桶个数，一个令牌桶控制一个IP．消除了tbf共享带宽的缺点．实验结果表明每一个IP得到的带宽都是固定的．达到了希望的效果。     

GPON动态带宽分配算法研究

针对GPON系统动态带宽分配过程中存在的时延特性,将经过最小均方误差算法修正的线性预测模型引入基于T-CONT的周期轮询动态带宽分配算法中,通过预测每个T-CONT在等待时间内到达的数据流量,来提高ONO向OLT申请带宽的准确度,降低业务传输时延.最后利用OPNET软件对改进算法进行仿真验证,仿真结果表明引入预测机制后...     

一种适于卫星IP广播网中的带宽分配策略

提出了一种适用于卫星IP广播网络的带宽分配策略。与现有的带宽分配策略相比,该策略采用的保证带宽分配和动态带宽分配相结合的方法,可以最大限度地利用系统的剩余带宽,提高了系统的带宽利用率。这种带宽分配策略是通过令牌桶算法实现的,实现起来比较简单,并可以和基于业务类别的服务质量保证机制结合起来使用。通过OPNET建模仿真,结果表明这种算法不但能对链路的总带宽进行预分配,还能对链路的剩余带宽实时地进行动态分配,实现了基于用户的服务质量的保证。     

一种保证EPON系统QoS的预估DBA算法

文章提出一种保证以太无源光网络(EPON)系统服务质量(QoS)的预估动态带宽分配(DBA)算法,该算法把多个子周期组合为一个超周期,在超周期中预估各级业务带宽,然后在子周期内参考预估值进行带宽分配;并对用户上行数据进行接入管理,维持QoS的稳定.实验结果表明,该算法既能保证各级业务的带宽利用率和时延要求,又能提供更加稳定的QoS.     

EPON支持QoS的动态带宽算法研究

本文给出了一种支持多优先级业务的带宽分配算法。其中高优先级业务固定带宽分配和低优先级业务动态带宽分配，将上行帧分为第一时隙和第二时隙两部分，各ONU高优先级业务在上行第一时隙发送，第二时隙用于低优先级业务，同时采用固定周期的带宽分配方案，因此降低了高优先级业务的时延和时延抖动。通过ONU实行内部调度并且参与上行接入计算，避免了上行复杂的同步问题，提高了链路利用率。     

P2P流媒体中的多发送端选择算法

 在多对单P2P流模式下,如何选择多个发送端,并为其最优地分配发送速率和数据是一个难题.为此,提出了一种新的多发送端选择和最优速率及数据分配算法(MSRDA).首先把待解决的问题模型化为线性最优化问题,然后给出了求解最优化问题的算法.不同于已有的算法只按链路的丢包率来选择发送端,MSRDA根据到各发送端链路的丢包率与链路的可用带宽比升序排序来选择多发送端,并最优地分配发送速率和数据.理论分析和仿真实验结果表明:在不同的网络条件下MSRDA能有效地减少聚合带宽的丢包率,并具有自适应性,优于现有同类算法.     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.