群智优化路径技术在风景园林规划设计中的运用

风景园林规划设计过程中计算机辅助技术起到了越来越大的作用,特别是在园林道路路径设计方面,有效的最短路径规划可以提升游客的体验。因此,提出一种基于群智优化的dijkstra最短路径规划算法。首先基于风景园林应用创建环境地图;然后对典型的dijkstra最短路径算法进行分析;最后采用群智优化对dijkstra最短路径算法进行改进,并给出信息素浓度更新的方法。仿真测试结果表明,相比传统dijkstra算法,提出的群智优化算法的路径长度更小,可以有效满足园林道路规划的需求。     

基于选择性迭代的KSP低轨卫星负载均衡路由方法

低轨卫星(Low Earth Orbit,LEO)系统具有传输时延低、路径损耗小和运行周期短的特点,但大规模卫星部署和地面业务非均匀性的特点,导致卫星网络局部拥塞和局部空闲,为优化卫星网络全局负载均衡和回避拥塞问题,文章提出一种基于选择性迭代的K最短路径算法(Selective Iteration of K Shortest Paths,SI-KSP)。与传统K最短路径方法相比,所提的SI-KSP负载均衡路由方法网络吞吐量增加且丢包率大幅下降;与CA-KSP方法相比,所提方法网络吞吐量相近但丢包率和平均时延均降低。该文所提方法能实现根据全局负载情况选择路径分布,有效避免链路拥塞,达到更优化的负载均衡效果。     

时延PCNN及其用于求解最短路径

本文在脉冲耦合神经网络(PCNN-Pulse Coupled Neural Network)的基础上,提出了时延脉冲耦合神经网络(DPCNN-Delay PCNN),并将其成功地用于求解最短路径,同时给出了基于DPCNN的最短路径求解算法.Caulfield与Kinser提出了用PCNN求解迷宫问题的方法,虽然他们的方法也可用于求解最短路径,但所需神经元的数量巨大,而本文的方法所需的神经元的数量远小于他们的方法.同时,本文的方法充分利用了DPCNN脉冲快速并行传播的特点,可迅速地求出最短路径,其所需的计算量仅正比于最短路径的长度,与路径图的复杂程度及路径图中的通路总数无关.计算机仿真结果表明,采用本文的方法,用少量的神经元就可迅速地求出最短路径.     

高级量测电气信息流多服务质量传输约束路由算法

智能微电网是实现可再生能源高效利用的有效途径,系统要求具有鲁棒自愈性。高级量测和可靠通信技术是实现以上目标的核心支持技术。基于流量工程理论和分布式代理技术,该文提出一种应用于智能微电网高级量测(AMI)系统的电气信息流传输多服务质量(QoS)保证路由算法(EIF-MQC)。首先设计了基于IEC61850电气标准的信息分形差分服务代码点(DSCP)映射模型,实现异构电气参量数据整形标记。并通过电气信息流多服务质量传输约束路由算法(EIF-MQC)选择满足流量QoS需求的最优路由。理论证明算法计算传输路径是有效最短路径。仿真实验采用电气可靠性技术解决方案联合会(CERTS)微网系统结构进行算法性能评价,在轻度和重度通信负载条件下,算法均具有较好带宽利用率,并比基于链路状态路由协议(OSPF)和负载均衡最短路径路由协议(LB-SPR)配置路径传输延迟低且丢包率小,从而有效避免网络拥塞,提升AMI系统传输性能。     

基于PCNN的迷宫最短路径求解算法

本文根据脉冲耦合神经网络(PCNN)并行运行的特点,提出了基于PCNN模型的迷宫最短路径搜索算法。从理论上对该算法进行了分析和讨论,并给出了具体的算法和实验结果,验证了该方法的有效性。与其他算法相比,该方法可以在最短的时间内完成最短路径的搜索。     

多链接透明互联技术及应用

传统的IEEE 802.1局域网使用STP构建层次化的无环路的网络,但是随着网络规模的扩大和网络内部横向流量的增多,这种模型逐渐不适应大范围二层网络的接入和扩展。文中介绍了一种IETF工作组定义的新技术———TRILL,在现有的IEEE 802.1框架内,将网络层的路由协议应用到链路层,实现数据最短路径和多路径的转发,满足了大规模园区网络和数据中心的建设。     

大型团体操队形变换路径计算机模拟算法的研究

目前计算机模拟技术越来越受到体育科研工作者和计算机模拟技术研究人员的重视.计算机模拟技术能够为体育工作者和运动员提供更加有效的、崭新的训练指导.本文通过对大型团体操队形变换路径的研究,提出了一个路径变换算法一最短路径算法,同时提出了路径冲突时的解决办法,从而为计算机模拟提出了算法基础.根据大型团体操队形变换路径计算机模拟结果,就能更加直接的找到团体操队形变换时每个队员的行进路线,为团体操的演练提供了很好的辅助手段.     

求解最短路径问题的改进人工鱼群算法研究

最短路径问题是交通网络分析中的一个重要问题,它是组合优化领域内经典问题之一。文中分析基本人工鱼群算法模型,指出其在求解交通路网最优路径问题中的不足,对人工鱼初始化和行为进行了改进。仿真实验表明,改进的人工鱼群算法(AFSA)具有更快的全局收敛速度,能有效地克服"早熟"收敛,是一种有效解决最短路径问题的寻优模式。     

基于RapidIo高速信号处理系统的网络枚举技术

介绍了RapidIo总线的特点,以及RapidIo总线初始化过程中面临的系统网络结构探测和最短路径路由选择问题。针对该问题,本文研究了深度优先(DFS)网络拓扑探测方法在RapidIo总线枚举过程中的实现,并采用Dijkstrad算法解决了RapidIo总线枚举过程中的最短路径选择问题。在某高速信号处理系统中对本文设计的RapidIo网络枚举算法进行了分析验证,结果表明该方法能正确的完成RapidIo网络的建立和最短路径的选择。该方法对基于Ra-pidIo总线的系统设计具有一定的参考价值。     

基于多链路权值减小的动态SPT算法研究

分支更新的动态最短路径算法可以有效提高动态最短路径计算的效率。通过分析动态最短路径算法研究的现状和问题,文章对Nfixed(v)的定义进行了改进,解决了原算法中的边检查冗余问题,改进了Min D和Max R算法边检查步骤,有效地减少了重复检查次数。仿真结果显示,改进后的算法具有更高的效率。     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.