基于Web的VOD视频点播系统的构建

VOD是以"用户自主"为基础的交互式多媒体视频点播系统,通过给出一个视频点播系统的具体构建方案,详细介绍了VOD视频点播/直播系统的各模块功能及实现技术.     

建立多媒体职工培训资源库的探讨

本文讨论了适合于职工培训的多媒体信息资源库的定义、建设目标原则，多媒体资源库主要由多媒体素材库、VOD视频点播系统和多媒体课件库等部分组成结构和工作原理。多媒体信息资源特性分析等方面的内容。     

基于Web的VOD服务器的设计与实现

VOD(Video On Demand)即视频点播,是随着计算机技术和网络通信技术的发展,综合了计算机、通信技术、电视技术而迅速新兴的一门综合性技术。介绍了流媒体技术的基本概念,基本主流技术,VOD系统的基本结构及工作原理以及实现的过程,设计出一种基于Web的VOD服务器,实现视频点播。     

高校视频点播VOD系统初探

视频点播VOD系统,是实现网上视及时播放的完全个体化学习的手段之一。它采用国际先进的视频流控制技术,利用网上视频点播VOD手段,结合多种媒体制作工具,实现教学模式的由集体教学向远程教学、最终向个体化教学模式的变革。视频点播VOD系统,即Open Video系统利用网络技术和视频压缩流媒体技术,提供在装有Windows网络系统的计算机上播放、创作和编辑电影、电视、声音、图像和其他媒体形式的简便方法。目前国际上比较流行的视频点播VOD系统,有基于Realplay和Quicktime的两种格式。高校可选择基于Realplay的网络视频点播VOD系统。该系…     

基于流媒体技术的校园网WebVOD的构建

在当今的计算机与信息技术时代,视频点播(VOD)技术作为一种网络媒体迅速渗透到人们的日常生活和学习当中。文章根据视频点播(VOD)流媒体的播放要求,介绍了流媒体技术的相关知识,阐述了基于校园网Web VOD系统的构建原理和软件工具选择,给出了一种基于流媒体技术的Web VOD系统构建方案。     

基于WEB实时视频点播系统的设计

VOD(Video on Demand)即视频点播,也称交互式电视点播系统.传统的电视系统信息单向传送,用户只能被动接收.而VOD是以"用户自主”的崭新概念为基础的双向视音频信息系统,实现了按用户需要播放视音频节目的理想.VOD是未来信息高速公路构架的重要组成部分,是未来信息服务中宽带业务的灵魂.     

一种基于P2P的视频共享系统的研究与实现

视频点播(VOD)是一种以用户为主导的音视频信息系统。传统的VOD系统多是C/S模式采用服务器机群或者代理缓存的方式来实现,这会带来较大的硬件和管理开销,系统扩展性也难以得到保证。文中提出了一种基于P2P结构的视频点播的设计方案,分析了采用P2P技术以后视频点播系统对于节点闲散资源的利用和保证播放质量等方面的优势,并探讨了在系统设计与实现中的相关技术与方法。     

基于P2P网络的视频点播系统设计

视频点播(VOD)是以用户需求为主导的视频系统,如何提高视频点播(VCD)系统的可扩展性和在动态环境中的可靠性,成为视频点播系统大规模应用的关键.文中提出了一种新的基于P2P(Peer to peer)的VCD(video-on-demand)系统,并阐述了系统设计所采用的相关技术与方法.系统中考虑了节点均衡负载对系统整体性能的影响,采用服务器集中调度与节点分布协调管理相结合的资源定位方式,灵活的候选父节点策略使节点失效后能进行快速的失效恢复,提高了VOD系统的可扩展性和动态环境中的可靠性.     

视频点播系统的开放式分布处理视点

1 引言分布式多媒体系统是计算机网络技术、通信技术、多媒体信息处理技术、分布计算技术、数据压缩技术等众多技术相互结合的产物,其应用已涉及相当多的领域,如教育、办公、新闻、出版、医疗、金融、计算机支持协同工作(CSCW)等。分布式多媒体系统中一个十分重要的应用是视频点播(VOD),它将远程视频服务器上的媒体信息,通过计算机网络或其它通信设施传送到本地的媒体处理器和媒体终点上。本文利用ODP(开放式分布处理)方法讨论了VOD实验系统的设计。     

视频点播系统中客户机端Buffer控制策略的新算法

为了确保Qos质量,合理利用有限的服务器和网络资源,提出了一种新颖的视频点播(VOD)系统中客户机端buffer的控制策略,即从视频点播(VOD)系统的整体设计出发,首先通过分析系统,并细化功能需求,提出了系统对客户机端buffer控制子模块的功能要求;然后,提出了一种新颖的buffer控制策略,从而成功实现了对buffer的控制.试验结果表明,该Buffer控制策略,能够达到系统整体对buffer提出的要求,且简单,灵活.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.