共查询到18条相似文献,搜索用时 62 毫秒
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由于国内不同网络运营商之间的网络访问瓶颈,在北方点播位于中国电信的江苏广电网站视频节目,访问速度非常缓慢。江苏广电网站通过采用CDN(ContentDeliveryNetwork)技术,突破这一瓶颈,使得全国以及海外的网民都能快速便捷地浏览网络视频。本文对CDN技术核心、解决方案以及应用情况进行了介绍和说明。 相似文献
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网格计算是信息技术的又一次革命,它的出现为分布式资源的共享和服务提供了一种新的方式。在网格计算的发展过程中,先后主要出现了两种体系结构“五层沙漏结构”和OGSA开放网格体系结构。主要介绍了OGSA体系结构并对它和Web服务进行了一个比较。 相似文献
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视频传输的流畅性和便捷性成为广电客户急迫的要求,而CDN (Content Delivery Network)技术将为互联视频业务插上腾飞的羽翼.CDN网络即“内容分发网络”,利用二八热点原则.将热点预先分发到边缘节点上,使得用户实现就近访问,提高用户的互联视频业务体验. 相似文献
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网络是继Internet和Web技术之后的第三个信息技术浪潮。本文简述了网络的定义、特点和基本体系结构,并且分析了网格技术在广播电视中的应用。 相似文献
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Tero Kangas Timo D. H?m?l?inen Kimmo Kuusilinna 《The Journal of VLSI Signal Processing》2006,44(1-2):79-95
Evolving video coding standards demand functional flexibility for implementations, not only at design time but also after
fabrication. This paper presents a System-on-Chip design approach with a feasible combination of performance, scalability,
programmability, area efficiency, and design time effort for a video encoder. The encoder is based on a homogeneous master-slave
processor architecture. Each slave encodes a part of the frame in the Single Program Multiple Data (SPMD) data parallel model.
Both shared and distributed memory architectures are presented. Design effort is reduced by identical program codes, automated
assembly of software and hardware modules independent of the number and type of processors, as well as our flexible on-chip
communication network called Heterogeneous IP Block Interconnection (HIBI). A case study implementation with two to ten simple
ARM7 processors, 32-bit HIBI bus and non-optimized processor-independent software gives the performance from 6 to 53 fps for
QCIF. The whole encoder area ranges from 173 to 770 kgates excluding the memories. The relation scales reasonably well to
systems with more powerful processors and optimized code. The optimization of the communication network shows that with more
than six slaves even a serial HIBI connection with 100 MHz speed is feasible. HIBI and the parallelization approach allow
exploration and optimization of the communication both at the application and architecture layers.
Tero Kangas, MSc ’01, Tampere University of Technology (TUT). Since 1999 he has been working as a research scientist in the Institute
of Digital and Computer Systems (DCS) at TUT. Currently he is working towards his PhD degree and his main research topics
are system architectures and SoC design methodologies in multimedia applications.
Kimmo Kuusilinna, PhD ’01, TUT. His main research interests include system-level design and verification, interconnection networks, and parallel
memories. Currently he is working as a senior research engineer at the Nokia Research Center.
Timo D. H?m?l?inen, MSc ’93, PhD ’97, TUT. He acted as a senior research scientist and project manager at TUT in 1997-2001. He was nominated
to full professor at TUT/Institute of Digital and Computer Systems in 2001. He heads the DACI research group that focuses
on three main lines: wireless local area networking and wireless sensor networks, high-performance DSP/HW based video encoding,
and interconnection networks with design flow tools for heterogeneous SoC platforms. 相似文献
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基于多层次网络结构,以"服务"为中心,构建了从信息获取、集成、处理到应用的完整的7层体系结构,提出了从数据库层、算法工具层、分析逻辑层到应用系统层4层资源管理逻辑模型,着重研究资源管理、资源交易等关键技术,实现重型机械领域的资源共享和信息服务。 相似文献
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“十二五”期间,国家电网公司信息系统应用不断深化,一级部署的大型管理信息系统数目不断增加,覆盖范围广,用户数量庞大,软硬件资源池、云计算等新技术对电力数据网提出了新的挑战.CDN是一个由分布在不同区域的节点服务器群组成的虚拟网络.CDN将信息资源推向网络边缘,使得客户快速访问到所需的内容.对电力信息业务的加速需求、电力CDN承载要求、关键技术进行了深入剖析.结合电力信息系统架构及电力数据网络,提出二级网络架构三层存储架构的电力CDN体系,深入分析CDN安全防护要求,最后设计开发了电力CDN管控平台和电力CDN实验床. 相似文献