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Kdd Review

In:

Submitted By ravage
Words 2170
Pages 9
Similarity based Analysis of Networks of Ultra Low Resolution Sensors
Relevance: Pervasive computing, temporal analysis to discover behaviour
Method: MDS, Co-occurrence, HMMs, Agglomerative Clustering, Similarity Analysis
Organization: MERL
Published: July 2006, Pattern Recognition 39(10) Special Issue on Similarity Based Pattern Recognition
Summary: Unsupervised discovery of structure from activations of very low resolution ambient sensors. Methods for discovering location geometry from movement patterns and behavior in an elevator scheduling scenario

The context of this work is ambient sensing with a large number of simple sensors (1 bit per second giving on-off info). Two tasks are addressed. Discovering location geometry from patterns of sensor activations. And clustering activation sequences. For the former, a similarity metric is devised that measures the expected time of activation of one sensor after another has been activated, on the assumption that the two activations are resulting from movement. The time is used as a measure of distance between the sensors, and MDS is used to arrive at a geometric distribution. In the second part, the observation sequences are clustered by training HMMs for each sequence, and using agglomerative clustering. Having selected an appropriate number of clusters (chosen by the domain expert) the clusters can be used to train new HMM models. The straightforward mapping of the cluster HMMs is to a composite HMM, where each branch of the HMM corresponds to an HMM in the cluster. The authors note that the training for such an algorithm would be quite intensive. As an alternative they propose a binary tree structure, where each node in the tree is a composite HMM of two layers, each layer corresponding to a child node. The tree is a heirarchical model of the entire dataset. It is unclear how to map the agglomerative

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