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In this work, algorithms are developed and evaluated to detect physical activities from data acquired using five small biaxial accelerometers worn simultaneously on different parts of the body. Acceleration data was collected from 20 subjects without researcher supervision or observation. Subjects were asked to perform a sequence of everyday tasks but not(More)
Three tools for acquiring data about people, their behavior, and their use of technology in natural settings are described: (1) a context-aware experience sampling tool, (2) a ubiquitous sensing system that detects environmental changes, and (3) an image-based experience sampling system. We discuss how these tools provide researchers with a flexible toolkit(More)
A new software tool for user-interface development and assessment of ubiquitous computing applications is available for CHI researchers. The software permits researchers to use common PDA mobile computing devices for experience sampling studies. The basic tool offers options not currently available in any other open-source sampling package. However, the(More)
Many algorithms have been used to cluster genes measured by microarray across a time series. Instead of clustering, our goal was to compare all pairs of genes to determine whether there was evidence of a phase shift between them. We describe a technique where gene expression is treated as a discrete time-invariant signal, allowing the use of digital(More)
Ubiquitous, context-aware computer systems may ultimately enable computer applications that naturally and usefully respond to a user's everyday activity. Although new algorithms that can automatically detect context from wearable and environmental sensor systems show promise, many of the most flexible and robust systems use probabilistic detection(More)
  • Ling Bao, Martin Cederwall, Bengt EW Nilsson
  • 2008
We discuss various aspects of dimensional reduction of gravity with the Einstein–Hilbert action supplemented by a lowest order deformation formed as the Riemann tensor raised to powers two, three or four. In the case of R we give an explicit expression, and discuss the possibility of extended coset symmetries, especially SL(n + 1,Z) for reduction on an(More)
This paper presents reliable high power and high brightness 9xx-nm single emitter laser diodes, which have been designed for various multi-emitter fiber-coupled modules. Diode lasers from legend generation have been life-tested with currents up to 14A at heat-sink and junction temperatures of 50°C and 80°C respectively, and have accumulated more than 15,000(More)
Mannanases can be useful in the food, feed, pulp and paper industries. In this research a Bacillus subtilis strain (named Bs5) which produced hign-level β-mannanase was isolated. Maximum level of β-mannanase (1231.41 U/mL) was reached when B. subtilis Bs5 was grown on konjac powder as the carbon source for nine hours at 32°C. The β-mannanase was a typical(More)
The hypermultiplet moduli space in Type IIA string theory compactified on a rigid Calabi-Yau threefold, corresponding to the “universal hypermultiplet”, is described at tree-level by the symmetric space SU(2, 1)/(SU(2)×U(1)). To determine the quantum corrections to this metric, we posit that a discrete subgroup of the continuous tree-level isometry group(More)
We formulate a theory of topological membranes on manifolds with G2 holonomy. The BRST charges of the theories are the superspace Killing vectors (the generators of global supersymmetry) on the background with reduced holonomy G2 ⊂ Spin(7). In the absence of spinning formulations of supermembranes, the starting point is an N = 2 target space supersymmetric(More)