基于LAN的分布式教学环境的研究和设计

文章讨论了现代教学模式的特点和需求,提出了分布式教学环境的目标。在此基础上,设计了一个基于ＬＡＮ的支持多媒体信息实时传输的分布式教学环境模型,并描述了模型支持的授课演示、提问举手、分组讨论、资源播放、个人自学和管理、教学管理等功能模块和多媒体通道的建立方法。     

分布式多媒体系统的主要研究领域与发展现状

分布式多媒体系统集多媒体信息的综合性、计算机的交互性、通信的分布性、电视的真实性等于同一个系统,按全新方式在众多领域为用户提供新型分布式多媒体信息服务。由于分布式多媒体系统是多媒体信息处理技术、分布式处理技术、高速网络技术等相互融合的产物,因此涉及的研究领域非常广泛。本文作者试图在较为全面地总结国内外已有研究成果的基础之上,结合多年从事分布式多媒体系统开发与应用的理论研究与工程实践的实际经验,对分布式多媒体系统涉及的主要研究领域作一概要综述,以期对分布式多媒体系统及其应用在我国的研究与发展能起到一定的推动作用。     

面向声音监测的多媒体传感器节点硬件设计与实现

多媒体传感器网络能够采集和传输信息丰富的音频、视频、图像等多媒体信息,具有十分广泛的应用前景,是近年来无线传感器网络的研究热点。目前,国外多媒体传感器节点主要针对图像传输;国内使用的节点大多都难以满足多媒体信息处理和传输等方面的应用要求。本文针对鄱阳湖鸟类声音监测的应用,设计实现了一种新型的高性能多媒体传感器节点。实验结果表明,由该节点组成的多媒体传感器网络,能有效建立路由,实时地感知和采集网络覆盖区域内的多媒体信息。     

基于MPEG-7本体的多媒体信息互操作研究

传统本体技术不能很好地解决多媒体信息系统的互操作问题。为实现多硬件平台下分布式、异构多媒体信息的互操作,采用MPEG-7本体描述多媒体信息。并在此基础上提出了基于MPEG-7本体的多媒体信息互操作框架,该框架采用MPEG-7本体,领域本体与应用本体等三个层次来描述对象。给出了框架的分层描述及具体功能。该框架已在高性能宽带信息网应用示范E-Show数字博览平台系统设计中采用,并取得了良好的应用效果。     

分布式多媒体系统同步机制的研究

分布式多媒体系统将是未来国家信息基础设施（NII）的重要组成之一。多媒体同步机制是分布式多媒体系统及CSCW系统中的一个关键问题,多媒体同步机制的优劣直接影响着分布式多媒体系统及CSCW系统的应用。在文章中,对分布式多媒体系统的关键技术--多媒体同步进行了讨论。着重分析了分布式多媒体同步、同步参考模型及形式化描述技术。     

2006环太平洋多媒体国际会议

http://www·pcm2006·org由浙江大学主办的2006环太平洋多媒体国际会议(Pacific-Ri m Conference on Multi media2006)将于2006年11月2~4日在杭州举行·PCM2006征文范围主要有多媒体分析与检索、多媒体传输与编码、多媒体终端应用以及多媒体信息安全·本次大会将举办若干分会进行相关议题的讨论,同时将举办讲座和展览·PCM2006诚请广大计算机界研究人员投稿·征文范围(但不限于此)·多媒体分析与检索多媒体分析与理解多模态处理多媒体编码和压缩多媒体内容表达和索引基于内容的多媒体检索跨媒体交叉索引与检索·多媒体系统和网络流媒体…     

一种分布式多媒体系统模型

一、引言 高速网络技术和多媒体工作站技术的进步为分布式多媒体系统的发展奠定了基。人们已经成功地开发出了很多新型的分布式多媒体应用,如远程学习,计算机会议、远程医诊断、分布式多媒体信息点播、远程多媒体数据库访问、多媒体电子邮件     

多媒体信息表现中资源竞争的研究

多媒休信息的表现与同步是多媒体系统,特别是多媒体电子邮件、计算机支持的协同工作虚拟现实模拟及分布式多媒体计算的关键技术。应用Petri网理论描述多媒体的同步技术刚刚起。增广对象     

多媒体数据压缩技术

多媒体技术把电视式的视听信息传播能力与计算机交互控制功能相结合,使计算机多媒体化,具有数字化全运动、播放、编辑和创作多媒体信息功能。多媒体信息经数字化处理后的数据量非常大,如何在多媒体系统有效地保存和传送这些数据就成为多媒体系统面临的一个最基本的问题,也是最大的难题之一。多媒体数据压缩技术有效地解决这一问题。     

走近流媒体技术

当今网络技术发展迅速,从网络上浏览多媒体信息已经成为网络应用新的热点。但多媒体文件一般比较大,不能从网上实时传输。为了提高视频数据在网络上的传输效率,各厂商竞相开发流文件与流媒体技术,以实现视频的实时播放。     

实时动态信息发布系统实现及发展

实时动态信息发布系统正是在这种背景环境下诞生的一种新型的媒体发布应用系统。实时动态信息发布系统是一种通过数字化音、视频多媒体处理,通过网络实现远程多点分布式播放和集中管理控制的系统,播放的信息是实时动态系统;一个操作员可以集中建立、编辑和分配内容给网络环境中的数量庞大的显示终端,即实现一台服务器集中管理,向多个不同场所地点的显示终端发布实时动态的多媒体信息。     

RFID-enabled real-time manufacturing information tracking infrastructure for extended enterprises

In extended enterprises, real-time manufacturing information tracking plays an important role and aims to provide the right information to the right person at the right time in the right format to achieve optimal production management among the involved enterprises. However, many enterprises are caused by lack of timely, accurate and consistent manufacturing data. The laggard information transfer flow and the unmatched information transfer method bring extended enterprises much more uncertainty and unknowingness. This paper proposes a RFID-enabled real-time manufacturing information tracking infrastructure (RTMITI) to address the real-time manufacturing data capturing and manufacturing information processing methods for extended enterprises. Following the proposed infrastructure, the traditional manufacturing resources such as employees, machines and materials are equipped with RFID devices (Readers and Tags) to build the real-time data capturing environment. In addition, a series of manufacturing information processing methods are established to calculate and track the real-time manufacturing information such as real-time manufacturing cost, progress, WIP (Work-in-progress) inventory etc. in parts/assemblies/products at machines/shop floors/enterprises/ extended enterprises levels. Finally, a case study is given to demonstrate the developed framework and corresponding methodologies.     

分布式多媒体教学信息传输控制系统

研究了“分布式多媒体教学信息传输控制系统”的体系结构、信息传输控制过程和实现方法,并对视频编解码技术和网络编程技术进行了详细探讨。     

Designing a Multimedia Information System Using Internet Techology

This paper presents major technical requirements for designing and developing future distributed multimedia information system using Internet technology. The key requirements of this system are to allow users to search, access, and communicate multimedia documents consisting of text, audio, video and image. We emphasize the role of object-oriented technology for information management and real-time communication protocols to guarantee QoS. it presents a reference architecture for Web-based real-time distributed multimedia system which provides several functionalities including real-time distributed multimedia system which provides several functionalities including real-time streaming, multimedia indexing and searching, and distributed object management.     

基于网格的煤矿安全应用网格体系研究

煤矿安全应用工作中数据信息分布、计算资源闲置、异构以及计算功能单一严重制约着行业应用和信息化的发展。网格（grid）是新一代高性能计算环境和信息服务基础设施,能够实现动态跨地域的资源共享和协同工作。该文基于新兴的网格技术,参照OGSA体系,提出并构建了从信息获取、处理到应用的完整的煤矿安全应用网格（CMSAG）体系结构。同时结合行业应用需求,着重研究了其资源表示、资源管理、存储访问以及数据缓存等关键技术,最后通过具体应用示例的工作流程论证了该网格体系的应用模式。     

A CORBA Based QOS Support for Distributed Multimedia Applications

Advance object oriented computing platform such as the Common Object Request Broker Architecture (CORBA) provides a conducive and standardized framework for the development of distributed applications. Most of the off-the-shelf CORBA are implemented over legacy network transports and distributed processing platforms such as TCP/IP and RPC. They are not suitable for real-time applications due to their high processing overheads, and lack of features and mechanisms in supporting quality of service both at the network level and at the end-host level. To overcome this limitation we have designed and implemented a CORBA-based Real Time Stream Service (RTSS) that allows real-time streams to be managed through the CORBA channel but by-passing the heavy CORBA protocol stacks. RTSS aims to achieve an integrated QOS framework that incorporates both host scheduling and end-to-end network-level QOS to better support the processing of distributed multimedia applications over ATM networks. For host scheduling, a novel scheme of frequency-based scheduling mechanism has been proposed to cope with dynamic CPU load condition. The scheme has been implemented for a stand-alone host and will be extended to the networked environment. At the network-level QOS, RTSS provides object-oriented application programming interfaces (APIs) which guarantee end-to-end QOS when operating directly over ATM adaptation layers. The benefits of RTSS for the development of real-time multimedia distributed applications are demonstrated through a number of experiments.     

DIPCS: An interprocess communication architecture for distributed multimedia systems

This paper presents the Distributed InterProcess Communication System (DIPCS) as a framework for managing communication in a distributed multimedia system. Within DIPCS, connection level management is provided through a novel distributed process group model called ADP-Group communication. The ADP-Group paradigm defines a new type of group message passing, calledqos-reliable. Qos-reliable semantics are appropriate to controlling real-time multimedia communication, by allowing a spectrum of performance and reliability specifications to co-exist within one group. DIPCS also provides an abstract programming model of multimedia devices, easing control of a heterogeneous multimedia system. Distributed multimedia applications can be rapidly developed using simple group operation primitives. We show how ADP-Group message delivery semantics can be directly mapped into an efficient Integrated Services Network support policy.Supported by Computational Diagnostics, Inc., and the Benjamin Franklin Fund for the Commonwealth of Pennsylvania.Supported by the Rome Laboratory (RL) of the Air Force Material Command and the Defense Advanced Research Projects Agency (Contract F30602-93-C-0038).