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Vol. 18, Special Issue, January 2013, pp. 177-187

 

Selected papers from the 3rd International Conference on Sensor Device Technologies and Applications (SENSORDEVICES' 2012)
and The 6th International Conference on Sensor Technologies and Applications (SENSORCOMM' 2012),

19 - 24 August 2012, Rome, Italy

 

Bullet

 

Faults in Sensory Readings: Classification and Model Learning

 
1 Valentina Baljak, 2 Tei Kenji, 1 Shinichi Honiden

2 National Institute of Informatics, Hitotsubashi 2-1-2, Chiyoda Ku, 101-8430 Tokyo, Japan

1 University of Tokyo, Hongo 7-3-1,Bunkyo ku, 113-8656 Tokyo, Japan

Tel./ fax: +81-3-4212-2000

E-mail: valentina@nii.ac.jp, tei@nii.ac.jp, honiden@nii.ac.jp

 

 

Received: 17 November 2012   /Accepted: 14 December 2012   /Published: 22 January 2013

Digital Sensors and Sensor Sysstems

 

Abstract: Faults in wireless sensor networks are a common occurrence and their accumulation can have a significant negative influence on the reliability of the network. Accuracy of sensory readings decreases over time.  We focus on detection of faults as they can be observed in sensory readings. Trace that faults leave in data can be used for classification of faults independently of the underlying cause. We propose a complete and consistent fault classification based on two aspects. The first aspect is continuity and frequency of the occurrence, and the second is the existence of observable and learnable patterns. The network can learn a model of a fault from the past behavior and patterns visible in the data. We rely on centralized and straightforward detection methods using neighborhood vote and time series analysis. For the full classification phase, we propose the use of statistical pattern recognition, specifically, decision trees and regression. Current results show that this method works comparatively well when applied to dense data-centric wireless sensor network.

 

Keywords: Fault tolerance, Model learning, Wireless sensor networks, Statistical pattern recognition

 

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