数字孪生城市——新型智慧城市建设的基础

数字孪生城市（Digital Twin City）的概念自提出之日起,便凭借其在虚拟空间、实体空间以及虚实空间之间的信息交互等方面的创新理念,而获得了来自学术界与产业界的极大关注。通过在虚拟数字空间构建数字孪生城市,作为物理城市在虚拟空间的镜像实体,实现对实体城市空间从宏观表象到微观细节的精准、全面、智能的数字化还原,从而为我国新型智慧城市的建立提供全新的思路与方法。     

基于本体的虚拟空间模型的研究

虚拟空间模型是由空间对象及其之间的空间关系构成,它为虚拟场景的构建提供了重要的语义信息。然而,由于空间对象和空间关系本身的复杂性,构建的虚拟空间模型通常是不全面的、非具体的。针对这种问题,在充分研究本体以及UML的基础上,提出了利用本体标记虚拟空间对象及对象之间的空间关系,从而构建了虚拟空间本体。论文首先提出虚拟空间中方向关系的计算方法,然后使用UML描述虚拟空间本体的空间结构,并使用OCL描述虚拟空间本体中虚拟对象的约束信息。最后通过一个虚拟办公室的实例,证明了该方法的可行性以及有效性。     

大学生短视频生产传播中的民族认同研究

以藏族大学生短视频的生产和传播行为为研究对象,关注到新媒体技术下短视频的生产和传播对藏族大学生媒介表达的意义,以及对虚拟社区意识和文化认同的重构,指出藏族大学生的短视频生产和传播过程,是视频生产者对藏族地域、文化、现代化发展进行媒介表达、传播,并形成新的认同感的过程。     

超媒介叙事视角下科普内容生产策略研究——以《工作细胞》为例

媒介融合背景下,超媒介叙事在多元化的新兴媒介助推下成为一种新型媒介生产方式,为科普带来全新的内容创作方式和文化生产体验。本文将超媒介叙事理论与科普内容生产实践相结合,构建出科普内容生产模型,以科普作品《工作细胞》为分析对象,从元叙事、叙事碎片、媒介选择、内容集成、交互生产等维度进行个案研究,全面剖析了科普内容生产流程及成功经验,验证了超媒介叙事在科普内容生产中的适用性和有效性。基于此,本文为科普内容生产提出以下新策略：建立组织协同网络,构建科普资源服务体系;搭建IP化内容矩阵,促进科技资源的可持续开发;鼓励用户参与叙事,形成科学知识交流共创社区;依托技术平台优势,打造科普内容产业生态。     

地铁公共艺术与城市美学构建——以南京地铁公共艺术设计为例

<正>城市美学形象的建立是城市化建设发展过程中不可或缺的一部分,它是城市形象与审美艺术二者的完美结合。本文以地铁公共艺术与城市美学形象的关系为线索,进行地铁与城市美学形象经典案例的探究。城市美学形象在建设的过程中对于地铁公共艺术能够做到会用和善用,推动城市美学形象向着更深层次的高度发展下去。现如今,城市地铁不仅仅是普通的交通工具,而是成为城市文化建设的延伸与拓展。地铁空间中的公共艺术设计不仅能够展现城市的精神与面貌,而且也是在建构城市新兴美学。本文以南京地铁特色艺术设计为例,分析作为公共艺术空间的地铁,与城市美学建构的关系。     

计算机图形学、计算机视觉

本文集为宽频空间信息处理专辑。收录的5篇论文主要涉及:针对3维虚拟空间的附带视差的结构适用法的研究,基于 VRML 的三维虚拟空间的共有化研究,虚拟环形空间内的导向图对移动的影响,电子共享用的虚拟环境,城市建筑物3维数据的自动生成方法等。     

基于虚拟空间的交互影像视觉设计

从虚拟空间中的交互影像出发，从现有的多线性可交互影视、虚拟现实（Virtual Reality,VR）空间及游戏案例中归纳其视觉表现特征以及应用；围绕满足“人”对新空间、新身份、超现实互动模式的定向期待与创新期待，探讨虚拟空间对人感官的影响以及VR体感交互带来的多维度体验，基于此，进行交互设计与视觉设计，让主体充分调动其专注力，高效率地接受空间信息。     

修正的虚拟空间平滑算法

对虚拟空间平滑方法进行了修正,提出了一种适用于直线信号(如调幅、二进制相移键控信号等)的修正虚拟空间平滑解相干方法.该方法无需对信号初始相位作特别假定,并可在不损失阵列有效孔径和工作阵元的情况下完成信号解相干,经其预处理后的特征子空间分解信号波达方向(DOA)估计方法的性能要优于传统空间平滑方法.     

“第七媒体”地下传奇

<正>同样是用多媒体占领感官,地铁和楼宇却不同,更像是一个公共而又封闭的空间,因此事情就有了更多的回味。"他"和"她",在末班地铁相遇,然后,就有了若干次看似漫不经心的相遇和一场浪漫爱情。这是香港数码传媒集团(DMG))前几年玩的一个"小把戏":在DMG控制下的上海地     

论特殊文化影像系统中的“特”——以《盗梦空间》为例

电影作为七大艺术门类之一,其艺术媒介的表达形式为运动的声画影像。在影像系统中,黄琳教授在《电影学原理》一书中按照影像系统的性质把它为七大类别,即象征影像系统、真实影像系统、抽象影像系统、特殊文化影像系统、兼容式影像系统、神话影像系统和解构型影像系统。本文以《盗梦空间》为例来具体阐明特殊文化影像系统的"特"在何处。     

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.     

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.