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. 2009 Nov 18;9(11):9175–9195. doi: 10.3390/s91109175

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© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 3. — ROC curves for detection of internal masqueraders (a) and external masqueraders (b) using our immunity-based method, the single-sensor HMM method and the uniqueness method. The parameters are as follows: L = 100, K = 100, N = 10, δ = e⁻²⁰⁰, N^int = 20, N^ext = 25, C = 1,000. The number of internal masqueraders is 25, and the number of external masqueraders is the same as that of internal masqueraders. The horizontal axis is a logarithmic scale, so we can focus on the missed alarm rate at the low false alarm rate.