开拓农村市场乡镇企业发展的战略突破点

当前市场问题已成为乡镇企业发展的主要瓶颈制约,而农村市场潜力巨大,前景广阔。不久前,江泽民总书记在苏南视察时指出:“谁率先打开农村市场,谁就能获得大发展的广阔天地”。同时,他用“近水楼台先得月”这句话,指出了乡镇企业在开拓农村市场中的优势。我们应把开拓农村市场摆到十分重要的位置,推动乡镇企业实现新的飞跃。 1 乡镇企业开拓农村市场有着得天独厚的优势。应当吃好“窝边草”。乡镇企业植根于农村,与农村经济血肉相连,下大力     

Peer-Paired Collaboration for On-Demand Streaming Applications and an Improved Error Recovery Technique

Previous studies on streaming media networks have mainly focused on how to conserve the network bandwidth, especially the Internet backbone bandwidth, while maintaining a desired quality. This paper tackles the problem from another perspective, trying to improve the individual streaming quality while not increasing the backbone traffic. Specifically, we apply a peer-paired collaborative streaming architecture that exploits the power of peer-to-peer networking and extends the peer-paired collaboration from a live broadcasting scenario to the more general on-demand streaming scenario by introducing a unique catch-up scheme. Experimental results show that the peer-paired collaboration can bring about a significant performance gain for on-demand streaming application scenarios, in addition, we propose a forward error correction based error recovery technique that can resist up to 50% packet losses regardless of whether the losses are independent or shared.     

Streaming Media over a Color Overlay Based on Forward Error Correction Technique

The number of clients that receive high-quality streaming video from a source is greatly limited by the application requirements, such as the high bandwidth and reliability. In this work, a method was developed to construct a color overlay, which enables clients to receive data across multiple paths, based on the forward error correction technique. The color overlay enlarges system capacity by reducing the bottlenecks and extending the bandwidth, improves reliability against node failure, and is more resilient to fluctuations of network metrics. A light-weight protocol for building the overlay is also presented. Extensive simulations were conducted and the results clearly support the claimed advantages.     

Efficient Error Recovery Techniques in a Novel Multimedia Streaming Framework with Peer-Paired Collaboration

Research on application-level multicast seeks to combine the merits of unicast and IP multicast while avoiding their drawbacks. Efficient error recovery in such a system is still a difficult problem. Current research is primarily focused on developing local error recovery techniques, but these techniques would not work with shared losses, which often occur in application-level multicast. This paper presents a novel multimedia streaming framework called peer-paired pyramid streaming (P3S) which is basically a hybrid client/server and peer-to-peer structure. In P3S, clients are hierarchically organized with those at the same level coupled as peer pairs. P3S uses some controlled delay between packets that are vulnerable to shared losses to reduce the shared losses. The technique is verified by both theoretical and experimental results.