云计算技术在开放大学信息化管理中的应用

文章通过介绍云计算概念和特点,分析地方开放大学对云计算技术的需求,在此基础上探讨云计算技术在地方开放大学信息化管理的新思路和途径,可供同行参考。     

办一所“大学” 打造一个“平台”——国家开放大学云平台探究

据国际知名的IT咨询公司Gartner所列出的十大最具战略意义技术排名显示,“云计算”从2010年开始便一直高居榜首。“云计算”的到来,彻底颠覆了人们以往对计算机、互联网的理解。恰逢国家开放大学成立之际,“国开”与“云计算”不谋而合,缔造出崭新的国家开放大学远程教育云平台。笔者将结合对“云计算”的认识,对国家开放大学远程教育云平台的建设进行探讨。     

云计算对高校信息化教学资源建设的影响

随着现代计算机技术的不断发展,高校信息化教育资源建已经成为了一种必然,为推动高校教学资源的增长以及教学效率的提高做出了很大的贡献.而云计算的出现为信息化教学资源的整合和高校教学质量的提高提供了一条便捷的道路,因此,很有必要对云计算的概念进行分析,进而探索出云计算下的高校信息化教学资源建设模式,最后得出云计算对高校信息化教学资源建设的影响,以提醒人们注重云计算对高校信息化教学资源建设的意义.     

开放大学云平台环境下的教与学模式研究

随着计算机网络的深入发展,云计算以其独特的优势成为信息技术越来越重要的发展方向,也是未来网络学习的基本环境与平台。办好开放大学构建终身教育体系是电大系统新的课题,开放大学的建设需要信息化技术的发展作保障。随着云计算和云服务快速发展,我们必须思考如何将云服务技术应用到开放大学终身教育体系中。搭建终身学习立交桥,为学习者、教师、学校、社会等提供综合性的教育服务云平台,教育资源平台,满足不同受众的学习需求。     

基于云计算的教学资源平台构建研究

高校信息化建设要得到发展,提高教学资源的利用效益,尽快实现数字教学资源共建共享是一个亟待解决的问题。本项目以保定职业技术学院网络技术专业为例阐述基于云计算的教学资源平台的建设与应用,主要包括以下3方面内容：一是云计算理念下的专业教学资源平台介绍,二是专业教学资源平台的架构,三是云计算下的网络技术专业教学资源平台建设和使用。     

军校教学资源整合中云计算技术的应用研究

当前,军校教学资源存在着共享性不足、建设维护成本高、发展不均衡、建设主体单一等问题。利用云计算技术进行教学资源的整合,可有效解决这些问题。文章介绍了云计算技术的涵义和特点,分析了其优势,并探讨了军校利用云计算技术进行教学资源整合的策略。     

基于“云计算”理念的数字化资源平台的构架设想

本文基于云计算的理念对教学资源平台的应用需求进行可分析,并提出了“云计算”教学资源平台的构建和功能实现构。     

基于“云计算”理念的数字化资源平台的构架设想

本文基于云计算的理念对教学资源平台的应用需求进行可分析,并提出了“云计算”教学资源平台的构建和功能实现构。     

基于云计算的高职网络教学资源平台建设探究

网络教学资源平台建设作为教育信息化建设的重要内容,成为现代教育推进和发展的方向,本文列举了现有网络教学资源存在的问题,分析了云计算环境下建设网络教学资源平台优势,提出了基于云计算的高职网络教学资源平台建设方案,为进一步平台建设提供了建设思路。     

面向开放式实验室的云计算教育功能组建

目前的开放实验室存在着教学资源分布不均、教学资源共享程度低、教学资源孤岛现象严重、缺乏相互协作等问题,云计算可以将分散的资源集中存储和管理。云计算是传统计算机和网络技术发展融合的产物,如今云计算发展突飞猛进,云计算可以促使开放实验室教与学趣味化,也可以促使实验室的制度化。     

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.