An Unsupervised Local Outlier Detection Method for Wireless Sensor Networks
2017
Recently, wireless sensor networks (WSNs) have
provided many applications, which need precise sensing data
analysis, in many areas. However, sensing datasets contain outliers
sometimes. Although outliers rarely occur, they seriously reduce
the precision of the sensing data analysis. In the past few years,
many researches focused on outlier detection. However, many
of them ignored one factor that WSNs are usually deployed
in a dynamic environment that changes with time. Thus, we
propose a new method, which is an unsupervised learning method
based on mean-shift algorithm, for outlier detection that can be
used in a dynamic environment for WSNs. To make our method
adapt to a dynamic environment, we define two new distances
for outlier detection. Moreover, the simulation shows that our
method performed on real sensing dataset has ideal results; it
finds outliers with a low false positive rate and has a high recall.
For generality, we also test our method on different synthetic
datasets.
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