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• W2082823418 abstract "The problem of detecting an anomaly (or abnormal event) is such that the distribution of observations is different before and after an unknown onset time, and the objective is to detect the change by statistically matching the observed pattern with that predicted by a model. In the context of asymmetric threats, the detection of an abnormal situation refers to the discovery of suspicious activities of a hostile nation or group out of noisy, scattered, and partial intelligence data. The problem becomes complex in a low signal-to-noise ratio environment, such as asymmetric threats, because the ldquosignalrdquo observations are far fewer than ldquonoiserdquo observations. Furthermore, the signal observations are ldquohiddenrdquo in the noise. In this paper, we illustrate the capabilities of hidden Markov models (HMMs), combined with feature-aided tracking, for the detection of asymmetric threats. A transaction-based probabilistic model is proposed to combine HMMs and feature-aided tracking. A procedure analogous to Page's test is used for the quickest detection of abnormal events. The simulation results show that our method is able to detect the modeled pattern of an asymmetric threat with a high performance as compared to a maximum likelihood-based data mining technique. Performance analysis shows that the detection of HMMs improves with increase in the complexity of HMMs (i.e., the number of states in an HMM)." @default.
• W2082823418 created "2016-06-24" @default.
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• W2082823418 date "2009-01-01" @default.
• W2082823418 modified "2023-10-18" @default.
• W2082823418 title "Anomaly Detection via Feature-Aided Tracking and Hidden Markov Models" @default.
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• W2082823418 doi "https://doi.org/10.1109/tsmca.2008.2007944" @default.
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