Inspection of four-sensor falls detector
Journal Title: Bulletin of the Military University of Technology - Year 2015, Vol 64, Issue 2
Abstract
The studies presented in this article are the continuation of previous work to develop a mobile fall detector. The algorithm is based on a discrete wavelet transform of the signals from the sensors available at the detector and a linear support vector machine as a classifier. Fisher score method is used for feature selection in the proposed algorithm. As a result of reducing the number of features, the number of support vectors has been also reduced — it has a direct impact on the upper estimate of the classification error. On the basis of the obtained results, the classifier parameters have been calculated. This allows presenting the developed concept in the field of ROCROCROC curves (Receiver Operating Characteristics) and their comparison with the results obtained for individual sensors. The developed concept gives much better results than each of the sensors acting independently. The findings of this study have given very good results in comparison with the previous findings, with a significant reduction in the number of required features. Due to the close relationship between the number of training data and the number of support vectors which directly affect the upper estimate of the classification error, the number of features has been reduced. Finally, satisfactory results have been obtained with the reduction of the number of features from 38 to just six, ensuring that the upper estimation of the classification error in the set of the new test data does not exceed 5.3%.[b]Keywords[/b]: falls detection, data fusion, discrete wavelet transform, support vector machine
Authors and Affiliations
Bartłomiej Wójtowicz, Andrzej P. Dobrowolski
Keywords
Related Articles
- EP ID EP62765
- DOI -
- Views 86
- Downloads 0
Analiza drgań kładki kompozytowej wywołanych działaniem wiatru
W pracy omówiono sposób przeprowadzenia uproszczonej, numerycznej analizy drgań kładki kompozytowej wywołanych działaniem wiatru. Rozważaniom poddano swobodnie podpartą konstrukcję o rozpiętości 16 m i przekroju w kształ...
Projekt TanDEM-X radarowych obserwacji powierzchni Ziemi prowadzonych z pułapu satelitarnego - założenia i status misji
TanDEM-X jest projektem Niemieckiego Centrum Kosmicznego — DLR (Deutsches Zentrum für Luft- und Raumfahrt) — zastosowania wysokiej rozdzielczości interferometrii SAR. Otwiera on nową erę w dziedzinie teledetekcji opartej...
Study on the influence of finite element formulation and equation of motion solution scheme on FEM analysis results based on the asymmetrically loaded plate problem
Computer simulations of physical phenomena are at the moment common both in science and industry. The possibility of finding approximate solutions for complicated systems of differential equations, mathematically describ...
Moduł czujników wielu gazów zagrożeń chemicznych
[b]Streszczenie[/b]. W artykule przedstawiono opis budowy oraz badania modułu czujników wielu gazów substancji chemicznych. Moduł jest w stanie wykrywać 11 różnych substancji w stanie gazowym jednocześnie i liczba ta moż...
Integrity and confidentiality three-level protection of the transmitted data in the industrial network
Mini-DCS containing process stations, operator stations, and engineering stations are considered in the paper. Process stations provide the control of the process. Operator stations are designed to process visualization,...