Training with synthesised data for disaggregated event classification at the water meter

Wonders, Martin, Ghassemlooy, Zabih and Hossain, Alamgir (2016) Training with synthesised data for disaggregated event classification at the water meter. Expert Systems with Applications, 43. pp. 15-22. ISSN 0957-4174

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Official URL: http://dx.doi.org/10.1016/j.eswa.2015.08.033

Abstract

Activity recognition in monitored environments where the occupants are elderly or disabled is currently a popular research topic, with current systems implementing ubiquitous sensing or video surveillance techniques. Using disaggregated data from smart meters could be a viable alternative to what is often perceived as intrusive recognition technology. Disaggregation methods have proven to perform exceptionally well when trained with large quantities of data, but gathering and labelling this data is, in itself, an intrusive process that requires significant effort and could compromise the practicality of such promising systems. Here we show that by synthesising labelled training data, using a domain specific algorithm, an innovative water meter disaggregation system that uses Artificial Neural Networks (ANN), Support Vector Machine (SVM) and K-Nearest Neighbour (KNN) classifiers can be trained in minutes rather than hours. We show that by artificially synthesising labelled data accuracies of 83%, 79% and 85% with the SVM, ANN and KNN classifiers, respectively can be achieved. Though these values are marginally lower than 89%, 83% and 89% achieved with no synthesis, the measure of accuracy masks the underlying imbalance of representative classes in the data set.

Item Type: Article
Uncontrolled Keywords: Assisted living, load disaggregation, machine learning, training data synthesis
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Nicola King
Date Deposited: 27 Oct 2015 09:53
Last Modified: 03 Nov 2016 15:29
URI: http://nrl.northumbria.ac.uk/id/eprint/24149

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