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Association rules are considered to be the best studied models for data mining. In this article, we propose their use in order to extract knowledge so that normal behavior patterns may be obtained in unlawful transactions from transactional credit card databases in order to detect and prevent fraud. The proposed methodology has been applied on data about(More)
Mobile Ad-hoc NETworks (MANETs) are multi-hop ad-hoc wireless networks in which there are no backbone infrastructure. Each Mobile Node (MN) acts either as a host generating flows or being the destination of flows from other MN or as a router forwarding flows directed to other MN. Due to the unpredictable location and mobility of MNs in MANETs, classical(More)
Achieving QoS (Quality of Service) inMobile Ad-hoc NETworks (MANET) has been a research topic in the last years. In this paper we describe a QoS reservation mechanism for Multirate Ad-hoc Networks. By multirate we refer to those networks where the mobile nodes can dynamically switch between several link rates. This allows the mobile nodes to select the(More)
Traditional ad-hoc routing protocols typically choose minimum hop paths for transmissions. In a multi-rate environment, where nodes may elect between several transmission rates in order to accommodate different channel conditions, these protocols usually choose paths that contain long range links, with low effective throughput and low reliability. In this(More)
As the use of WLANs based on IEEE 802.11 increase, the need for QoS becomes more obvious. The upcoming IEEE 802.11e aims at providing QoS, but its contention-based medium access mechanism, enhanced distributed channel access (EDCA), provides only service differentiation. In order to provide QoS guarantees, we have proposed an extension called EDCA with(More)