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. 2018 Jul 25;18(8):2411. doi: 10.3390/s18082411

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Detection results using standard deviation (STD) threshold in monitoring parameters u_c: (a) u_c in Figure 8; (b) u_c in Figure 9; and, (c) u_c in Figure 10.