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Distributed storage systems provide reliable storage service by storing data, with a certain amount of redundancy, into a substantial number of storage nodes. In order to compensate the data loss incurred by node failures, the lost data should be regenerated. Tree-structured regeneration, during which storage nodes may relay the network traffic, has shown its potential to improve the efficiency of...
Distributed storage systems, built on peer-to-peer networks, can provide large-scale data storage and high data reliability by redundant schemes, such as replica, erasure codes and linear network coding. Redundant data may get lost due to the instability of distributed systems, such as permanent node departures, hardware failures, and accidental deletions. In order to maintain data availability, it...
Interference channels (IFC) with generalized feedback (GF) model wireless channels where every node overhears the transmission of other nodes and uses it to engage in cooperative communication strategies. The overheard signals, instead of being treated as interference, furnish the basis for cooperation among otherwise uncoordinated users. Although cooperative communications is not equivalent to virtual...
Peer-to-peer applications require high cooperation among users. User cooperation consists of two aspects, upload and download operations. However, not all users are willing to cooperate, and free-riders with little upload bandwidth are widely seen in the applications. Hereby, we put forward the relation between data block probability and the node distance in static situations. Then we discuss the...
Interference channels (IFC) model peer-to-peer networks where several source-destination pairs compete for the same channel resources. IFCs with generalized feedback (IFC-GF) further model scenarios where the sources can sense the current channel activity, like in wireless channels. The signal overheard from the channel provides information about the messages sent by the other users, and furnishes...
In this paper we discuss the problem of network fairness. Traditional network fairness focuses on treating uneven resource (such as bandwidth) allocation in TCP congestion control mechanisms. Hereby, we present a novel definition of application- based network fairness as an extension to the traditional one. We explain the significance of fairness scheduling in real-time network businesses, analyze...
The properties and limitations of human visual system (HVS) are usually incorporated into objective video quality techniques for better correlation with subjective methods. In this paper, we propose a new objective assessment algorithm based on reduced reference video quality metrics (RR-VQM). The key point of our method is to design multilayer Spatial-Temporal (ST) regions based on human's fovea...
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