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Data Grids provide services and infrastructure for distributed data-intensive applications accessing massive geographically distributed datasets. An important technique to speed access in Data Grids is replication, which provides nearby data access. Much of the work on the replica placement problem has focused on average system performance and ignored quality assurance issues. In a data grid environment,...
This paper studies the problem of constructing application-layer multicast trees for end-system based voice conferences in which voice mixing and replication are performed at end systems. This problem is formulated as a degree-constrained node-weighted Steiner tree problem with a degree-dependent cost associated with each node, which is a generalization of the degree-constrained node-weighted Steiner...
The widespread use of ICT equipment is expected to increase the power consumed by ICT rapidly and it is recognized that the energy consumption of ICT equipment themselves (Green of ICT) should be one of key issues. This paper first identifies the need of the collaboration among end systems, the communication network and the power network, in order to reduce the total power consumption by the entire...
DCCP is proposed to replace UDP for its ability of congestion control while maintaining its promptness by ignoring lost packets as UDP does. The network would suffer less congestion. However, whether the applications that switch from UDP to DCCP can maintain their needed performance or not is a big question. This paper investigates this problem by evaluating DCCP based VoIP vs. a variety of TCPs using...
In this paper we present a network resource management framework, based on an home network model, that ensures the QoS (Quality of Service) of distributed multimedia applications. The latter are deployed, on the user demand, on the heterogeneous devices and the heterogeneous communication links of the home network. The resource management framework contains dedicated components to estimate the required...
In peer-to-peer video-on-demand (P2P VoD) streaming services, a video server load is reduced by peers who cache data of the viewed videos and send these data to other peers instead of the video server. Although FIFO is typically used as the caching algorithm, it is not efficient for using upload bandwidth of the peers because the peers can cache the data of unpopular videos and cannot be requested...
In a wireless ad hoc network, multiple end-to-end flows that traverse through the same wireless communication range compete for the shared wireless bandwidth. Then, how to allocate those shared bandwidth among flows is one of most critical issues for the system performance. To that end, this paper proposes an auction-based bandwidth allocation with multi-hop flow coordination mechanism to enhance...
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