Néstor M. Peña

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Cooperation among nodes is fundamental for the operation of mobile ad hoc networks (MANETs). In such networks, there could be selfish nodes that use resources from other nodes to send their packets but that do not offer their resources to forward packets for other nodes. Thus, a cooperation enforcement mechanism is necessary. Trust models have been proposed(More)
The scarce resources of a mobile ad hoc network (MANET) should not be wasted attending selfish nodes (those nodes that use resources from other nodes to send their own packets, without offering their own resources to forward other nodes’ packets). Thus, rational nodes (those nodes willing to cooperate if deemed worthy) must detect and isolate selfish nodes(More)
In this paper we estimate the end-to-end total bandwidth (BW) and available bandwidth (ABW) of a path between a pair of nodes in an IEEE 802.11b ad hoc network, both as functions of packet length, using dispersion traces between probing packet pairs of different lengths. The pairs of packets that suffer the minimum delay are used to estimate the maximum(More)
Colonization of a novel plant by herbivorous insects is frequently accompanied by genetic changes that progressively improve larval or adult performance on the new host. This study examined the genetic basis of adaptation to a marginal host (lentil) by the seed beetle Callosobruchus maculatus (F.). Quasi-natural selection in the laboratory rapidly increased(More)