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In this paper, we consider a delay and energy constrained wireless ad hoc network with node density of $\lambda_{n}$, where a packet should be delivered to the destination within $D(\lambda_{n})$ seconds using at most $E(\lambda_{n})$ energy in joules while satisfying the target outage probability. The performance metric for analyzing the network is the delay and energy constrained random access...
These days, with the implementation of ubiquitous computing concept, sensor networks that collect analyze and process information of things and environment through sensors have become a huge interest as the technology that would realize this concept. However, sensor network technology has wireless communication infrastructure as its foundation and fundamentally has security weakness with limitations...
While a lot of important information is being sent and received on the Internet, the information could be exposed to many threats, and the more the multicast service is various and generalized, the more the service range is widened. When a new member joins in or leaves from the multicast group, the group key, which the existing member used, should be newly updated. The existing method had a problem...
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