面向DTV中间件的QT/Embedded图形库的改造与实现

数字电视(DTV)系统需要为用户提供良好的图形用户交互界面.在DTV平台中,如果采用QT/Embedded作为底层图形库,则需要帧缓冲(FrameBuffer)设备处理相关的底层命令.针对DTV目标平台不支持FrameBuffer的问题,对Qt/Embedded的底层图像抽象层进行了深入地分析,提出了Qt/Embedded的改造方案,将Qt/Embedded图形库成功地移植到目标平台上,对嵌入式图形库的移植有很好的借鉴价值.     

FrameIDTV: A framework for developing interactive applications on digital television environments

Digital TV technologies are stretching out the horizons for interactive applications to end users. However, developing interactive applications for this new environment is not as straightforward as developing Internet applications. In order to make this development process easier in the context of interactive digital TV (iDTV), one of the solutions is the development of Frameworks. However, after investigating some of the existing iDTV framework solutions, we have found a limitation on the range of the interactive application domain to DTV available in these current frameworks, which mainly show solutions for local interactive (enhanced TV). Thus, in this paper, we propose an iDTV Framework (called FrameIDTV) that makes possible a broader solution in the DTV domain for the construction of interactive applications, both local and remote. The remote interactivity is possible using a generic and easy to customize communication protocol that is specified in the framework for the application layer. Furthermore, applications such as voting, home banking, and t-commerce, which are executed locally in the set-top box and are integrated to remote services using a return channel, can use the proposed framework. FrameIDTV also allows the establishment of secure communications and is developed following a specific framework methodology. This framework has primarily targeted the Brazilian Digital TV standard and its procedural middleware, called Ginga-J. Nevertheless, FrameIDTV can be broadly used worldwide, since it is compliant with the Globally Executable MHP (GEM) standard.     

Broadcast to Broadband: Unlicensed Access to Unused TV Channels?

Although much public attention has focused on the US digital TV transition- and the resulting reallocation of analog TV channels by auction to wireless carriers - the US Federal Communications Commission will decide how to reallocate an even larger swath of prime TV band spectrum this year: the unused "white space" between occupied DTV channels. This reallocation of unused spectrum from broadcasting to broadband permits unlicensed access for both fixed and mobile applications. Although this policy is strongly supported by high-tech companies and consumer advocates, it's just as strongly opposed by broadcast licensees and other incumbent users of the TV band.     

一种TCP友好的Internet DTV组播发送速率控制机制

当前的Internet没有对流媒体应用提供足够的QoS的保证,同时Internet DTV的组播发送速率必须满足以下两点要求:1)能够自适应网络拥塞的变化;2)能够适应节目码率的要求,因此需要在服务器端进行组播发送速率控制.分析了Internet DTV组播的难点,提出了一种基于缓冲区管理的具有网络自适应特性的组播发送速率控制方法.通过合理地控制发送方的发送速率,既能自适应网络状况的变化,又能满足流媒体实时播放的需求.仿真实验结果表明,该算法在保证服务器端发送缓冲区不溢出前提下,与单纯采用TFMCC方法比较,减少了接收端的平均丢包率,提高了网络电视节目流的传输质量.     

社区宽带综合业务网服务质量保证的研究

社区宽带综合业务网络系统使用交换式以太网技术,在一个物理网络上为社区用户提供Internet接入、数字电视、IP电话等服务,对三网融合进行了实践性探讨。提出并实现了一套保证系统服务质量的方法,并在测试中取得了满意的效果。     

基于数字电视中间件平台的媒体播放器的研究与实现

在数字电视硬件平台的基础上，参考DVB MHP标准分析了数字电视中间件模型的结构与功能，研究了JavaTV业务选择与JMF媒体呈现机制，设计完成了媒体播放器，实现了中间件平台的音/视频媒体控制和业务信息访问两个功能模块。在数字电视嵌入式平台上进行了性能测试，并获得良好的播放效果。     

Using Broadcast Networks to Create On-demand Extremely Large Scale High-throughput Computing Infrastructures

A growing number of very simple parallel applications can benefit from the availability of very large computing resource pools that are exploited in an opportunistic way to considerably speed up the processing of these applications. In particular, many applications can scale out to take advantage of the availability of thousands, or even millions, of processors that can be simultaneously used. Some large-scale distributed computing infrastructures (DCI) have already been successfully assembled to this end. However, these DCI are normally designed to cater to specific kinds of applications, and their assemblage is not only costly, but also time consuming. We propose a novel architecture, named OddCI (On-demand DCI), for the cheap, fast and on-demand instantiation and dismantle of very large DCI. These characteristics allow application users to dynamically commission DCI that can cost-effectively be customized to their particular needs, and disposed after being used. Our approach leverages on broadcast communication as an efficient mechanism to enable aggregation of geographically distributed computing resources, including millions of non-traditional processing devices such as mobile phones, and digital television (DTV) receivers. We discuss how the proposed architecture can be implemented on top of a network of DTV receivers, providing evidences of both the technical, as well as the operational feasibility of the OddCI architecture.     

Dynamic IP configuration of terminals in broadcasting networks

The concept of synergy between broadcasting and telecommunication networks has been strengthened by the emergence of multi-modal terminals, which are used in a broadcast environment (mainly in DTV-Digital Television networks) to provide IP-based multimedia services. The migration of IPv4/IPv6 applications, either interactive or not, in a broadcasting network, requires that certain parameters, such as Host, Gateway and DNS IP addresses are configured in the terminals, either statically or dynamically. This paper discusses issues of dynamic configuration of IP parameters for DTV terminals, based on an overview of relevant mechanisms usually used in access networks. It proposes an IP-based auto-configuration protocol tailored to the needs of an IP/DTV access platform, describes its implementation and evaluates its behaviour in a laboratory-based DVB-T network.     

数字电视机顶盒在线软件升级协议规范化

软件在线升级是数字电视机顶盒必备功能之一,存在的问题是不同厂商采用私有的方法,不利于产业的发展和数字电视有线网络的维护。在介绍数字电视机顶盒软件升级的常用方法基础上,采用标准数据轮播的方法进行软件升级。该方法使用简便,考虑了现有软件升级描述的需要,有利于在线软件升级协议规范化。     

面向DTV的嵌入式中间件研究与实现*

在数字电视(DTV)系统中,如何解决异构平台和操作系统对上层应用支持的问题,是实现数字电视普及的关键。数字电视中间件作为一种采用组件思想设计的软件,具有实时嵌入式特性,符合数字电视系统对效率和资源的要求及限制。它使多媒体应用能在不同硬件厂商开发的数字电视平台上运行,实现了应用程序“一次编写,多处运行”的思想,降低了数字广播服务运营的成本,用更少费用能享受到更加丰富多彩的数字化服务。     

An empirical investigation of the consumer demand for digital television application services

In the era of convergence of digital television (DTV) broadcasting and internet, DTV application services will be the key to success. Through theoretical and empirical analysis, this study showed that the integrated model which includes basic products/services, value-added services, interactive services, and behavioural intention is applicable to explain consumer's demands of DTV application services. Results indicated that value-added services is the most important factor affecting the behavioural intention to adopt DTV application services, while interactive services is the best way to create consumer's emotional value. In addition, this study also provided some impetus for both researchers and practitioners.     

基于QT/E的嵌入式图形支持系统

面向消费电子的嵌入式技术迅速发展，对图形支持系统提出了更高的要求。该文给出了一种资源受限系统的轻型高效的嵌入式图形系统解决方案，结合数字电视应用的具体需求，阐述了该系统的体系结构、移植技术和实现方法。该图形支持系统已经成功运行于目标平台，证明了技术方案是可行有效的。 关键词：     

Assessment visual fatigue of watching 3DTV using EEG power spectral parameters

Although the three-dimensional television is popular for its stereoscopy, the fatigue caused by the prolonged watching of 3DTV should not be underestimated. Electroencephalogram (EEG) has been widely used for monitoring the brain’s functional activities. Based on our previous research of 3DTV fatigue, one more objective and effective 3DTV fatigue evaluation model is proposed on gravity frequency of power spectrum and power spectral entropy. As the fatigue changes, the gravity frequency reflects the transition of EEG power spectrum and the power spectral entropy describes the level of chaos of EEG. 16 channels of EEG data of twenty-five subjects watching 2DTV and 3DTV were collected, and gravity frequency of power spectrum and power spectral entropy were then calculated and analyzed. These two parameters of the 3D group changed more significantly comparing with that of the 2D group on several electrodes. There are significant decreases in gravity frequency and power spectral entropy in several brain regions after long time of watching 3DTV, which indicates the decline of subjects’ alertness level. Based on the subjective evaluation and two significant parameters, gravity frequency and power spectral entropy, an accurate evaluation model for 3DTV fatigue was established using the regression equation.     

一种实时纠错的P2P模式网络立体电视播放系统

随着宽带网络飞速发展,网络立体电视将成为未来视频主流业务.提出一种实时纠错的P2P模式网络立体电视播放系统的解决方案,该方案利用P2P技术进行视频传输,利用LDPC码进行纠错.经实验证明,在高斯噪声下,纠错后的立体视频与未纠错的相比,PSNR值平均提高约15dB.通过在CERNET2网络中测试,系统充分保证了立体视频的正常观看,同时系统配备认证功能,并且兼容IPv4和IPv6网络环境,能够为未来网络立体电视产业化发展提供有力支持.     

New projection tubes using spherical phosphors and an electron gun having an impregnated cathode

Today, demand for flat and large displays are increasing dramatically. One of the solutions is a projection CRT system, which has significant advantages of low cost and high picture quality.1 We have newly developed projection tubes that combine spherical phosphors and a new electron gun that uses an impregnated cathode, resulting in a 40% improvement in resolution as well as a 5% increase in brightness compared with conventional tubes. The new projection tubes are suitable for high‐resolution displays for DTV and HDTV applications.     

基于UCL的DTV Commerce安全认证模型

基于UCL技术和互补结构网络的理论,提出了一种在数字电视平台上实现具有高度安全的和信息认证功能的数字电视电子商务系统模型,给出了数字电视电子商务的系统组成和模型的层次结构,实现了电子商务信息和PKI认证系统要素的UCL标引和映射,给出了一种安全认证机制。     

基于高性能计算环境的科学计算应用平台设计与实现

为了提升高性能计算环境的易用性并降低使用门槛,本文提出了一种基于高性能计算环境的通用科学计算应用平台构建方案,旨在为用户提供更便捷、体验更友好、简单高效的科学计算服务。用户通过访问网页即可输入计算参数、提交任务、查看执行结果并集中管理不同应用的计算任务和历史数据,无需安装相关工具或者记忆操作命令。该方案设计充分考虑了应用间的差异性,拥有良好的扩展性,易于部署和迭代,同时拥有良好的安全性。     

Forum Theatre as a requirements gathering methodology in the design of a home telecommunication system for older adults

The ability to elicit requirements in the design of new technology has proved to be particularly problematic with older generations of users who have not grown up with the same level of familiarity and understanding of present day user interfaces as younger generations have. It is also widely acknowledged that older people are poorly represented in the development process of mainstream technology. In this paper, we critically examine how 'Forum Theatre' can be used as a requirements gathering methodology in the development of a novel digital television (DTV) based communication system. We demonstrate how live theatre established a 'common ground' between audience participants and actors in the facilitation of new ideas, and discuss how live theatre can be used to stimulate interest and understanding from designers and relevant professionals in the development of an unfamiliar and largely undefined technology for older adults.     

基于日志挖掘的电商查询建议方法

查询建议可以有效减少用户输入、消除查询歧义,提高信息检索的便捷性和准确率。随着电子商务的发展,查询建议也越来越多地应用于电子商务网站的商品搜索中。然而,传统的基于Web搜索的查询建议方法在电商领域并不能完全适用。针对电商这一特定领域,对不同的查询建议技术进行比较,提出了一种综合考虑用户的搜索以及购物行为的查询建议方法,运用MapReduce技术对用户日志进行挖掘,以此生成检索词词库;并通过在线计算与离线计算结合的方法,为用户提供实时查询建议。实验结果表明,本文提出的基于日志挖掘的电商查询建议方法能有效提高查询建议的准确率,并且具有良好的处理性能。     

使用SQL实现数字电视业务计费算法与仿真

基于数据库和SQL语言在数据查询方面高效的特性,通过对数字电视包月业务的计费规则、数据特性的分析,使用SQL语言实现数字电视包月业务计费处理算法.在对数字电视业务运营中的计费规则、计费算法和数据特性分析基础上,按照数据分类处理原则进行算法分解;在用SQL语言构造大批量数据计费处理算法时,通过构造临时字段来优化查询效率;通过数据库的自动调度机制,实现定时执行计费结算任务.不同数量级别数据对算法的仿真实验表明,算法在数字电视包月业务的计费处理中具有很高的效率.为数据库系统应用数据处理提供了一种模式.