512 research outputs found
Security Aspects of Internet of Things aided Smart Grids: a Bibliometric Survey
The integration of sensors and communication technology in power systems,
known as the smart grid, is an emerging topic in science and technology. One of
the critical issues in the smart grid is its increased vulnerability to cyber
threats. As such, various types of threats and defense mechanisms are proposed
in literature. This paper offers a bibliometric survey of research papers
focused on the security aspects of Internet of Things (IoT) aided smart grids.
To the best of the authors' knowledge, this is the very first bibliometric
survey paper in this specific field. A bibliometric analysis of all journal
articles is performed and the findings are sorted by dates, authorship, and key
concepts. Furthermore, this paper also summarizes the types of cyber threats
facing the smart grid, the various security mechanisms proposed in literature,
as well as the research gaps in the field of smart grid security.Comment: The paper is published in Elsevier's Internet of Things journal. 25
pages + 20 pages of reference
Quickest Anomaly Detection in Sensor Networks With Unlabeled Samples
The problem of quickest anomaly detection in networks with unlabeled samples
is studied. At some unknown time, an anomaly emerges in the network and changes
the data-generating distribution of some unknown sensor. The data vector
received by the fusion center at each time step undergoes some unknown and
arbitrary permutation of its entries (unlabeled samples). The goal of the
fusion center is to detect the anomaly with minimal detection delay subject to
false alarm constraints. With unlabeled samples, existing approaches that
combines local cumulative sum (CuSum) statistics cannot be used anymore.
Several major questions include whether detection is still possible without the
label information, if so, what is the fundamental limit and how to achieve
that. Two cases with static and dynamic anomaly are investigated, where the
sensor affected by the anomaly may or may not change with time. For the two
cases, practical algorithms based on the ideas of mixture likelihood ratio
and/or maximum likelihood estimate are constructed. Their average detection
delays and false alarm rates are theoretically characterized. Universal lower
bounds on the average detection delay for a given false alarm rate are also
derived, which further demonstrate the asymptotic optimality of the two
algorithms
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