基于流水式电路交换的混合容错路由算法

随着芯片集成度的提高和IP核的增多,片上网络（NOC）已成为片上系统[1]（soc）芯片设计的重点。当节点和链路由于网络规模的增大从而导致故障率大大增加,这样,运用容错技术提高系统的可靠性就成为NOC的设计重点.本文在对PCS的研究基础上,基于2D-mesh拓扑结构,提出了一种基于流水式电路交换机制（PCS）改进型的容错路由算法,并在OPNET仿真平台对其进行了仿真和性能分析。     

多域光网络中基于优先级的波长路由分配算法

本文提出一种在多域光网络中基于优先级的路由波长分配算法.算法设计旨在解决复杂网络拓扑下,多任务请求路由波长分配问题.本文首先根据复杂网络拓扑情况与任务请求状况,完成多域的划分,对跨域任务的最短路由进行路由分裂;其次依据域内与域间优先级设定策略,完成多任务请求优先级设定;按照优先级顺序,采用模糊优化波长分配算法完成波长分配.仿真结果表明本算法在处理复杂网络拓扑、多任务路由波长分配问题上效果明显,有效的降低了网络请求阻塞率,提高了光网络资源利用率.     

WDM 网络中基于优先级的多任务波长路由分配算法

提出了一种在WDM网络中基于优先级的多任务波长路由分配算法。算法设计旨在提高光网络资源的利用率、降低网络请求阻塞率。分析了任务请求的路由类型以及负载容量对请求优先级划分的影响方式,给出了网络请求优先级划分策略,结合网络的实时状态提出了一种基于优先级的多任务波长路由分配算法。仿真结果表明,该算法相比现有算法降低了网络请求阻塞率,提高了资源利用率。     

一种基于校园网的流媒体拥塞控制路由策略

文章针对6PE校园网的特点,提出一种基于节点拥塞度约束的拥塞控制路由算法,在保证用户流QoS请求的同时,通过调整节点拥塞度来进行负载均衡,从而达到拥塞避免的目的.仿真实验结果表明,该策略能从一定程度上提高网络吞吐量及减少请求包的阻塞率,有利于流媒体传输.     

稀疏城市车载网络中的静态结构动态权重路由

以上海市4 000辆出租车为期两年的GPS数据为依托,设计仅存在于理论意义上的车载网络路由最优算法并对其进行仿真,一方面,最优路由算法的结果揭示了现有路由算法的不足;另一方面,根据最优路由算法的宴际路径特点,设计了基于地图的静态结构动态权重的路由策略来逼近车载网络路由的理论最优性能,这一路由算法相对干传统的地理路由和其变种算法在性能方面有超过50%的提升.     

基于链路失效模型的多级电力业务路由规划

该文从智能电网中电力业务多样性的角度出发,分析不同类型业务对网络的可靠性需求。建立链路失效函数模型,并基于该模型设计面向可靠性的路由规划方法。以网络阻塞率和资源利用率为指标,通过与传统链路失效路由算法的比较分析来验证所提出方法的有效性。传统链路失效路由规划算法忽略了电力业务多样性,对接入网络的业务请求无差别处理,路由规划约束条件相对单一,导致网络阻塞率较高。该文所提路由算法充分考虑了不同业务对网络需求的多样性,依据业务等级调整目标函数并分别进行路由分配,从而降低网络阻塞率,提升网络可靠性和资源利用率。     

基于量子遗传算法的网络拥塞控制路由算法研究

由于传统算法在网络拥塞时的适应度较差,为此提出基于量子遗传算法的网络拥塞控制路由算法研究。利用量子遗传算法对网络路由进行迭代计算,计算出符合网络延时、延时抖动、分组丢失等方面约束条件的路由;利用KMB方法寻找网络中的Steiner点,以此作为网络宽带约束最小路由结果输出,文章实现了基于量子遗传算法的网络拥塞控制路由算法设计。经实验证明,利用此次设计算法得到的路由适应度优于传统算法,能够满足网络拥塞路由控制的需求。     

一种基于Dijkstra+策略的路由空洞算法GEAR+

针对无线传感器网络中地理位置和能量路由(GEAR)算法可能产生的路由空洞问题,GEAR算法通过改变自身和邻居节点的代价来解决问题,但同一节点可能会再次遇到同一路由空洞.文中提出了一种基于Diikstra+策略的路由空洞GEAR+算法可以避免上述问题.仿真分析表明,该算法在平均能量消耗和节点发送数据分组的数量上都优于GEAR算法.     

片上网络容错路由算法研究

随着集成电路制造工艺的不断发展,集成在芯片上晶体管的数量也随之增多,已超过几十亿晶体管的规模,因此芯片上可以集成越来越多的IP核。随着芯片中IP核数量的增多,基于总线结构的片上系统(System-on-Chip,So C)已不能满足数据的通信要求,为了解决这个问题,片上网络(Network-on-Chip,No C)作为一种全新的互联结构被提出来。其核心是把网络设计的思想移植到芯片设计中,将片上资源互连起来,并将计算与通信分离。片上网络具有很好的空间可扩展性,采用的全局异步一局部同步的通信机制使并行通信效率更高。NOC带来了一种全新的片上通信方式,它的引入有利于提升可重用设计、解决通信瓶颈和全局同步等难题。本文在研究片上网络结构的基础上,针对片上网络多播通信的特点提出了一种多播容错路由算法。     

NOC基于2D MESH的路由算法的比较

NOC设计的目的就是从体系结构上解决片上通信的瓶颈问题和时钟问题,片上网络的每条传输路径都包含若干路由器,经过每个路由器都要消耗数个时钟周期,当网络拥塞时,包传输会产生更大的延时,因此采用合适的路由算法来达到延时、吞吐率等的平衡是关键。本文使用NIRGAM仿真器对XY和OE两种算法在4×4的MESH拓扑上进行算法研究,结果显示OE算法的吞吐率和包延时的比值是2.5358,比XY路由算法的比值2.1126大,因此OE路由算法更适用于Mesh拓扑。     

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.     

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.     

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.