251 research outputs found
`Q-Feed' - An Effective Solution for the Free-riding Problem in Unstructured P2P Networks
This paper presents a solution for reducing the ill effects of free-riders in
decentralised unstructured P2P networks. An autonomous replication scheme is
proposed to improve the availability and enhance system performance. Q-learning
is widely employed in different situations to improve the accuracy in decision
making by each peer. Based on the performance of neighbours of a peer, every
neighbour is awarded different levels of ranks. At the same time a
low-performing node is allowed to improve its rank in different ways.
Simulation results show that Q-learning based free riding control mechanism
effectively limits the services received by free-riders and also encourages the
low-performing neighbours to improve their position. The popular files are
autonomously replicated to nodes possessing required parameters. Due to this
improvement of quantity of popular files, free riders are given opportunity to
lift their position for active participation in the network for sharing files.
Q-feed effectively manages queries from free riders and reduces network traffic
significantlyComment: 14 pages, 10 figure
Defensive Glands of the Darkling Beetle Mesomorphus villiger
Massive home invasion by the darkling beetle Mesomorphus villiger Blanchard 1853 (Coleoptera: Tenebrionidae) during monsoon season make it a nuisance pest in many regions of south India. Morphology of defensive glands and mode of release and dispersal of the defensive secretion were analysed. Defensive glands were separated from the abdominal sternites by cutting along the posterior margin of the seventh sternite. Glands are evaginations of intersegmental membrane between the seventh and eighth sternites consisting of two long sac-like reservoirs, and glandular secretion is released by exudation and spread through epipleural gutter of elytra. Gradual release of the secretion is a strategy to repel the predators for a longer duration
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