武进全区广电网络双向互动全覆盖的实施和改造

本文介绍了武进广电在原有网络的基础上,进行了既经济又高效的双向网改造和建设方案。对已经建设双向网络的CMTS覆盖区域和未进行双向网改造的区域进行基于EPON EOC的双向网改造技术方案。对新建小区住宅楼采用EPON LAN的接入方案。这两个区域的双向网改造和建设方案均考虑到了互动业务的发展,能很好地支撑上网和互动业务,对未来的OTT等高带宽业务也有很好的可扩展性。     

基于联合调度和DHT补偿的P2P直播系统播放质量改善策略

In Peer-to-Peer (P2P) streaming systems, video data may be lost since peers can join and leave the overlay network randomly, thereby deteriorating the video playback quality. In this paper we propose a new hybrid mesh and Distributed Hash Table (DHT) based P2P streaming system, called HQMedia, to provide high playback quality to users by maintaining high data dissemination resilience with a low overhead. In HQMedia, peers are classified into Super Peers (SP) and Common Peers (CP) according to their online time. SPs and CPs form a mesh structure, while SPs alone form a new Streaming DHT (SDHT) structure. In this hybrid architecture, we propose a joint sched-uling and compensation mechanism. If any frames cannot be obtained during the scheduling phase, an SDHT-based compensation mechanism is invoked for retrieving the missing frames near the playback point. We evaluate the performance of HQMedia by both theoretical analysis and intensive simulation experiments on large-scale networks to demonstrate the ef-fectiveness and scalability of the proposed system. Numerical results show that HQMedia significantly outperforms existing mesh-based and treebased P2P live streaming systems by improving playback quality with only less than 1% extra maintenance overhead.     

浅谈管理学的发展趋势——管理信息化

介绍管理学的发展变迁,阐述信息管理作为管理的一种活动,其本身所具有的特点和它对管理学的发展所起到的推动作用。     

有粘弹薄层负载时薄板中的Lamb波传播

从弹性波理论出发,结合边界条件,导出了一面有粘弹薄层负载时薄板中Lamb波的色散方程,通过数值计算,研究了薄板中Lamb波传播色散、衰减等特性及负载层参数对Lamb波传播的影响。最后提出了一种结合Lamb波和SH波微传感实现粘弹薄膜材料复Lamē参数λ^*和μ^*的定征方法。