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We present a wearable system that uses ambient electromagnetic interference (EMI) as a signature to identify electronic devices and support proxemic interaction. We designed a low cost tool, called EMI Spy, and a software environment for rapid deployment and evaluation of ambient EMI-based interactive infrastructure. EMI Spy captures electromagnetic interference and delivers the signal to a user;s...
We demonstrate through a pressure sensor matrix, that weight distribution on feet is influenced by body posture. A small cheap carpet equipped with low precision pressure sensor matrix is already sufficient to detect subtle activities and identity of the person on the carpet. By a 0.4 m2 matrix of 32 × 32, 12 bit pressure sensors, we achieve 78.7% accuracy for 11 test subjects performing 7 subtle...
Localization in wireless sensor networks (WSNs) is an essential service, important as both a goal and a mean. It is a goal for WSNs in order to label reported data and a mean for most WSNs to implement networks management services. In distributed localization, there could be a small number of nodes, which have a priori knowledge about their position, called reference nodes and most of the other nodes...
Our prior work suggested the use of power traces of unresponsive sensor nodes to diagnose the cause of anomalous node silence, but suffers from its limitations in scalability. To address these issues, we propose a new concept of power watermarking, a diagnostic service that actively produces unique power watermarks for each system state of interest so as to convey system information over power measurements...
This paper presents an energy-efficient processing platform for wearable sensor nodes, designed to support diverse biological signals and algorithms. The platform features a 0.5V-1.0V 16b microcontroller, SRAM, and accelerators for biomedical signal processing. Voltage scaling and block-level power gating allow optimizing energy efficiency under applications of varying complexity. Programmable accelerators...
Distance measurement between nodes in wireless sensor networks is a prerequisite for a variety of applications and algorithms. However, special hardware allowing such measurements is expensive, especially if dealing with hundreds or thousands of nodes. Fekete et al. presented an approach on distance estimation based on only the neighborhood information available to all nodes in the network. We improve...
Freezing of gait (FOG) is a common gait deficit in advanced Parkinsonpsilas disease (PD). It is often a cause of falls, interferes with daily activities and significantly impairs quality of life. Gait deficits in PD patients are often resistant to pharmacologic treatment; therefore effective nonpharmacologic assistance is needed. In this paper we show the potential of context aware assistance for...
Mobile mapping system has become an irresistible trend used for 3D urban environment modeling, transportation engineering, road survey and other applications during last few years. A typical car-borne laser scanner based mobile mapping system today can be considered as a multi-sensor system that integrates various navigation devices and data acquisition sensors on a rigid, moving platform like a van...
Existing localization approaches are divided into two groups: range-based and range-free. The range-free schemes often suffer from poor accuracy and low scalability, while the range-based localization approaches heavily depend on extra hardware capabilities or rely on the absolute RSSI (received signal strength indicator) values, far from practical. In this work, we propose a mobile-assisted localization...
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