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In this decade, peer-to-peer (P2P) applications have emerged as popular tools for sharing data and they have gained much attention. Such P2P applications build overlay networks on top of existing infrastructure networks and disseminate data in a peer-to-peer manner. How well the P2P overlay network maps onto the underlying physical network topology can significantly impact P2P application performances...
The standard transmission control protocol(TCP) can not distinguish between the random packet losses due to high bit error rate(BER) and the packet losses due to network congestion. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance in wireless and lossy systems. Meanwhile, the performance of TCP would be deteriorated very...
In this paper we study how the connectivity affects the performance of insular parallel genetic algorithms (PGAs). Seven topologies PGAs were proposed, with growing number of connections. We used three instances of the well-known traveling salesman problem as benchmark. Each island of the PGA had different parameters and we established a fixed migration policy for all islands. Experiments were done...
Mathematical models of many real life optimization problems turn out to be so complex that traditional optimization techniques such as gradient based methods and other deterministic techniques etc are not applicable for them. A new class of optimization techniques called population-based meta-heuristics (PBM) is applied for the solution of these problems. Particle Swarm Optimization algorithm (PSO)...
Based on the assumption of a single wiring open in a signal net, it is known that the non-tree topology for a signal net has no adjacent loop. In this paper, based on RC non-tree transformation in Elmore delay model, an optimal algorithm for timing analysis is firstly proposed to compute the timing delays of all the reference nodes in a non-tree topology. Compared with the SPICE tool, the experimental...
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