Three-dimensional digital planes

Definitions of 3-D digital surface and plane are introduced. Many geometric properties of these objects are examined. In particular, it is shown that digital convexity is neither a necessary nor a sufficient condition for a digital surface element to be a convex digital plane element, but it is both necessary and sufficient for a digital surface to be a digital plane. Also algorithms are presented to determine whether or not a finite set of digital points is a (convex) digital plane element.     

Three-dimensional digital line segments

Digital arcs in 3-D digital pictures are defined. The digital image of an arc is also defined. A digital arc is defined to be a digital line segment if it is the digital image of a line segment. It is shown that a digital line segment may be characterized by the chord property holding for its projections onto the coordinate planes. It is also shown that a digital line segment may not be characterized by its own chord property. A linear time algorithm is presented that determines whether or not a digital arc is a digital line segment.     

Digital Natives und Digital Immigrants

The article looks at the differences between “digital natives” and “digital immigrants.” Digital natives are the new generation of young people born into the digital age, while “digital immigrants” are those who learnt to use computers at some stage during their adult life. Whereas digital natives are assumed to be inherently technology-savvy, digital immigrants are usually assumed to have some difficulty with information technology. The paper suggests that there is a continuum rather than a rigid dichotomy between digital natives and digital immigrants, and this continuum is best conceptualized as digital fluency. Digital fluency is the ability to reformulate knowledge and produce information to express oneself creatively and appropriately in a digital environment. The authors propose a tentative conceptual model of digital fluency that outlines factors that have a direct and indirect impact on digital fluency namely, demographic characteristics, organizational factors, psychological factors, social influence, opportunity, behavioral intention and actual use of digital technologies.     

基于 TD_SCDMA 电子相框的照片分享方案

随着数码相机的普及,拍摄的数码照片呈几何级数增加,除了少部分会被冲洗成纸质照片以外,大部分数码照片都会被保存在电子存储设备中。电子相框是非常适合的存储设备,兼具展示数码照片的功能,近年来正在蓬勃发展。本文分析了电子相框发展的现状和业务需求,针对传统电子相框面临照片更新与共享的问题,提出了一种基于TD_SCDMA（Time Division-Synchronous Code Division Multiple Access）的照片分享方案,将电子相框接入UMTS（Universal Mobile Telecommunications System,通用移动通信系统）,采用电子相框统一服务平台实现了照片在手机、电脑和电子相框之间的无缝分享。     

论数码与传统相机拍摄

数码相机的大众化发展后,引起了摄影界关于使用数码与传统相机的各类争论,笔者根据使用数码相机与传统相机进行摄影创作的相关状况对数码与传统相机进行对比,从相机性能与创作感受方面阐述数码与传统相机拍摄的优劣,提出在使用数码相机时必须要调整好创作观念、态度,使之与数码相机拍摄相适应,充分的发挥数码相机的优势。     

基于.Net的网上数码冲印系统的设计

专家保守地预测我国的数码冲印市场今后3年内将保持100％的增长率,到2005年数码相片冲印量将超过5亿张。投资数码冲印店被很多人视为新的奶酪,但客户携数码文件去冲印店冲洗照片的方式给客户带来了很大的不便,从而阻碍了数码冲印市场的发展,而网上数码冲印系统则可以有效地缩短客户与冲印店的距离,提高冲印店的运营效率。因此,提出了基于．Net开发网上数码冲印系统的方法。     

基于数字水印技术的安全电子合同系统

本文就电子合同的易仿造和易篡改提出了一种新的解决方案——采用数字水印技术来保证电子合同的完整性和不可否认性。本方案以在某企业的具体应用为背景实现了一套对电子合同进行散列、数字签名,然后通过水印技术将信息隐藏入合同的安全电子合同系统。     

基于DCI的数字作品版权保护研究和设计

互联网的发展使数字作品版权保护面临着历史性的挑战,解决互联网版权问题对于版权产业的发展起着决定性作用。为了有效地保护数字网络环境下的作品版权,对版权保护方案进行设计。通过数字作品版权登记平台为每个数字作品赋予DCI,对数字作品的版权进行标识,通过特定的水印检测算法提取出数字作品中的DCI码,获取作品的权利信息,从而确认数字作品的版权真伪,为实现数字作品版权的检测、跟踪、取证及证据保全等管理工作奠定基础。     

基于网格的联邦数字图书馆

介绍了一种联邦数字图书馆结构,它通过对网络中数字图书馆资源进行一定的服务封装形成数字图书馆资源仓储节点,在此基础上运用网格思想对仓储节点进行整合,形成数字图书馆资源联邦,使用户能够通过联邦门户透明地访问联邦中所有数据仓储节点中的图书馆数据资源。为了满足专业化、个性化数字图书馆建立的需求,联邦提供了以检索为基础的个性化数字图书馆实例的动态定制服务。     

解剖学的数字化实验教学平台的构建探索

随着数字医学及数字医疗技术的迅速发展,针对高等医学院校解剖实验教学中存在的问题,如何提高解剖学教学质量,文章介绍了数字化解剖,并分析了数字化解剖实验室的特点,将云计算技术应用到管理数字化实验教学中。给出了基于云计算技术的数字化解剖实验教学平台解决方案,改革数字化解剖实验室,提出一种新的数字化解剖教学模式。     

基于ARM和STi5x数字网络机顶盒的设计

论文设计了一款基于ARM9和Sti5518的数字网络机顶盒。文中对传统的数字机顶盒和数字网络机顶盒作了比较，通过比较发现．数字网络机顶盒在传统数字机顶盒的基础上增加了ARM9核CPU模块和双口RAM模块，数字网络机顶盒设计实现后．不仅能够完成传统数字机顶盒的所有功能，而且能够完成电视节目的存储、与互联网的连接，以及通过互联网能够完成的其它功能。文中同时给出的数字网络机顶盒的硬件逻辑设计。     

BMP图像的防伪数字水印

近年来,随着数字媒体的大量出现,数字水印作为一种信息安全技术越来越受到人们的关注。目前已经有许多BMP图像的数字水印算法,但是这些算法生成的数字水印图像很容易受到拷贝攻击,所谓拷贝攻击是指敌手将水印从一个作品拷贝到另一个作品的攻击方法。BMP图像的防伪数字水印算法把密码技术和数字水印技术结合起来,其生成的数字水印图像可以克服拷贝攻击。     

Pricing strategies for tied digital contents and devices

Media companies are increasingly offering digital content to consumers. Many of these companies are tying digital content with their proprietary digital devices. In this study, we develop a consumer demand model for digital device and digital content based on a constant elasticity demand function. In modeling consumer valuation of the digital device, we take consumer surplus on digital content into account. We further derive equilibrium prices for digital devices based on an oligopoly competition model with horizontal product differentiation. We analyze the equilibrium prices and how prices affect firm profits. We find product differentiation and the level of product substitutability affect prices. We also find that content price plays a significant role in affecting the price of the digital device. Content price can either increase or decrease the tied digital device price depending on the profit margin and demand elasticity of the digital content. We further analyze how content and device prices affect their respective profits and the overall profit of the firm. We extend our model to vertical product differentiation and find vertical product differentiation and the level of product quality affect prices.     

数字图书馆中数据对象的描述和检索

数字图书馆中最基本的元素是数据对象，对数据对象的描述、存贮和检索构成了数字图书馆的基本功能。该文首先介绍了一个数字图书馆结构框架，并以此为基础提出了数字图书馆中基本元素数据对象的描述方法和目前正在制定中的标准，然后给出了一个基于层次化树状结构的数据对象检索方法。     

Characterizations of simple points,simple edges and simple cliques of digital spaces: One method of topology-preserving transformations of digital spaces by deleting simple points and edges

The notion of a simple point plays an important role in topology-preserving thinning, skeletonization and simplification of digital images. This paper presents new dimension-independent characterizations of simple points, simple edges and simple cliques based on the notion of a digital contractible space and contractible transformations of digital spaces. We show that a given digital space can be transformed to a normal digital space by the removal of simple points, edges and cliques while preserving topology. We describe a topology-preserving thinning algorithm, which transforms a given digital image to a normal one.     

XML技术在数字内容递送中的应用

数字内容递送是发展Internet上数字内容市场的一个关键。数字内容递送技术的目标是平滑的集成递送链上的各种应用、安全递送数字内容以及增强数字内容的可信度。由于XML的优良特性,它能够为数字内容递送技术带来巨大优势。文中探讨了一些应用XML的数字内容递送技术,包括基于XML的数字内容组织和管理技术、数字权限管理技术以及基于XML的安全技术;并对所实现的一个安全递送原型系统作了简单介绍。     

Digital parallelism, perpendicularity, and rectangles

The slope of digital line segments is defined and an algorithm to evaluate it is presented. Parallelism and perpendicularity of two digital line segments are also defined. Finally, rectangular digital regions are defined and characterized, and an algorithm that determines whether or not a given digital region is a digital rectangle is presented.     

From simple digital twin to complex digital twin Part I: A novel modeling method for multi-scale and multi-scenario digital twin

In recent years, the digital twin has attracted widespread attention as an important means of digitalization and intelligence. However, the digital twin is becoming more and more complex due to the expansion of need on the simulation of multi-scale and multi-scenario in reality. The instance of digital twin in references mostly concentrates a particular application, while it is still a lack of a method for constructing the complex digital twin in the total elements, the variable scale of working environments, changeable process, not even the coupling effects. In this paper, a novel modeling method for such a complex digital twin is proposed based on the standardized processing on the model division and assembly. Firstly, the complex model of digital twin is divided into several simple models according to the composition, context, component, and code in 4C architecture. Composition and context make the digital twin focus on the effective elements in a specific scale and scenario. Component and code develop the digital twin in standard-based modularization. Secondly, assemble the simple models of digital twins into the complex model through information fusion, multi-scale association and multi-scenarios iterations. Ontology establishes the complete information library of the entities on different digital twins. Knowledge graph bridges the structure relationship between the different scales of digital twins. The scenario iterations realize the behavior interaction and the accuracy calculation results. It provides an implementable method to construct a complex model of digital twin, and the reuse of components and code also enables rapid development of digital twins.     

Digital diversity among upper secondary students: A multilevel analysis of the relationship between cultural capital,self-efficacy,strategic use of information and digital competence

This paper addresses digital diversity among upper secondary students. Since 2006 digital skills and competence has been embedded as key competence in the Norwegian national curriculum. A sample of 593 Norwegian students from 43 upper secondary schools participated in a survey with a digital competence quiz and a self-report questionnaire. Analysis showed differences in students' digital competence and indication of digital diversity on both student and school level. A multilevel analysis reveals that cultural capital, language integration at home, self-efficacy, strategic use of information and average grades of the students predict 20% of the variation in students' digital competence score and 49% of the variation between schools' average digital competence score.     

Digital and cellular convexity

We introduce a new definition of cellular convexity on square mosaics. We also define digital convexity for 4-connected sets of points on a square lattice. Using these definitions we show that a cellular complex is cellularly convex if and only if the digital region determined by the complex is digitally convex. We also show that a digital region is digitally convex if and only if the minimum-perimeter polygon (MPP) enclosing the digital region contains only the digital region. This result is related to a property of the MPP of the half-cell expansion of the complex determined by the digital region.