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Network-adaptive HD MPEG-2 video streaming with cross-layered channel monitoring in WLAN

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 885-893页

作者： PARK Sanghoon YOON Hayoung KIM Jongwon Networked Media Laboratory Department of Information and Communications GwangJu Institute of Science and Technology Gwangju 500-712 Korea

In this paper, we propose a practical design and implementation of network-adaptive high definition (HD) MPEG-2 video streaming combined with cross-layered channel monitoring (CLM) over the IEEE 802.11a wireless local area network (WLAN). For wireless channel monitoring, we adopt a cross-layered approach, where an access point (AP) periodically measures lower layers such as medium access control (MAC) and physical (PHY) transmission information (e.g., MAC layer loss rate) and then sends the monitored information to the streaming server application. The adaptive streaming server with the CLM scheme reacts more quickly and efficiently to the fluctuating wireless channel than the end-to-end application-layer monitoring (E2EM) scheme. The streaming server dynamically performs priority-based frame dropping to adjust the sending rate according to the measured wireless channel condition. For this purpose, the proposed streaming system nicely provides frame-based prioritized packetization by using a real-time stream parsing module. Various evaluation results over an IEEE 802.11a WLAN testbed are provided to verify the intended Quality of Service (QoS) adaptation capability. Experimental results showed that the proposed system can mitigate the quality degradation of video streaming due to the fluctuations of time-varying channel.

关键词： Wireless video, Adaptive video streaming, Cross-layered design, prioritized packetization, MPEG-2

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THE RELATIONS BETWEEN NONMONOTONIC TRUTH MAIN-TENANCE AND NONMONOTONIC LOGICS

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Journal of Shanghai Jiaotong university(Science) 1999年第1期4卷 24-28页

作者：杨杰凌旭峰杨勇

Nonmonotonic reasoning and nonmonotonic truth maintenance are two important research aspects of artificial intelligence, which have close relations. Existing nonmonotonic truth maintenance systems can be used as the theorem provers of conventional nonmonotonic logics, but they can't represent and deal with prioritized nonmonotonic reasoning. This paper presented stratified truth maintenance systems which can represent and deal with prioritized justifications. It will be shown that the stratified ATMS can be used as a theorem prover of prioritized nonmonotonic logics.

关键词： artificial intelligence nonmonotonic truth maintenance stratified truth maintenance prioritized nonmonotonic logics

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