this demo paper presents a new sensor focusing on the measurement of real time foot plantar pressure distribution. IEE S.A. releases a single insole-solution for daily usage in order to acquire information on the plan...
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Cyber-Physical systems are immersed in an environment in which they are expected to operate reliably. the specificity of the target scenario has, however, a unique impact on the system behaviour that is hard to forese...
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the sensing capabilities of most sensor networks are fixed at the time of deployment. Adding new sensing capabilities to such networks is a costly and cumbersome process. We present Passive sensor Tags, battery-free s...
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the restricted energy budget of energy-harvesting sensor nodes demands algorithms for adaptive duty-cycling. However, their comparison and development is hindered by the lack of reproducibility of environmental condit...
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Low-power microcontrollers lack some of the hardware features and most of the memory resources that usually enable multipro-grammable systems. Accordingly, operating system software for these platforms has not provide...
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Measurement of the distribution and magnitude of static and dynamic earth pressures resulting from geostatic and applied stresses is essential to the design and performance of many civil engineering-type structures in...
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ISBN:
(数字)9780784481479
ISBN:
(纸本)9780784481479
Measurement of the distribution and magnitude of static and dynamic earth pressures resulting from geostatic and applied stresses is essential to the design and performance of many civil engineering-type structures involving soil-structure interaction. Seismic soil pressures recorded on a vertical flexible hollow shaft with model scale dimensions of 0.8 m square and 7.0 m in height are compared with predictions from elastic-based analytical approaches found in current literature. the vertical shafts were part of an underground structure system, placed in a laminar soil box, and embedded in a two-layer soil stratigraphy. Two directional ground motions were applied via shake table testing at the E-Defense facility in Japan. Pressure measurements were recorded using recently developed pressure sensors and details pertaining to the design, fabrication, and calibration of the sensor are discussed. Despite of the uncommon geometry of the vertical shaft systems, elastic based methods were able to predict the response reasonably well, in some cases capturing both, pressure magnitudes and pressure distribution.
Location-based services have become an important market. At their core, location-based services generally rely on identifying the location of individuals or objects. In outdoor environments, determining the location i...
ISBN:
(纸本)9781450359528
Location-based services have become an important market. At their core, location-based services generally rely on identifying the location of individuals or objects. In outdoor environments, determining the location is typically accomplished by means of GPS. In indoor environments, Bluetooth Low Energy (BLE) based localization has received a lot of attention. Most recently, an increasing number of mobile devices are capable of supporting ANT as an alternative low-power communication protocol. Unlike BLE, however, the suitability of ANT for localization has not been analyzed extensively. We report the initial results of an experimental study to compare ANT and BLE when used for localization. the results suggest that ANT-based localization can clearly outperform BLE, when using fingerprinting as the underlying localization principle.
the Web of things (WoT) Interest Group (IG) in the World Wide Web Consortium is actively working on standard technologies for IoT interworking. In this IG, they aim to reduce costs through the global reach of Web stan...
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ISBN:
(纸本)9781450359511
the Web of things (WoT) Interest Group (IG) in the World Wide Web Consortium is actively working on standard technologies for IoT interworking. In this IG, they aim to reduce costs through the global reach of Web standards, to enable open markets of services, and to unleash the power of the network effect. In this paper, we introduce the WoT works and show the result of implementation for applying WoT to our IoT device.
Modern microcontrollers come with a selection of clock sources that have widely differing frequencies and power consumptions. For applications whose workloads vary over time, dynamically changing the clock can provide...
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ISBN:
(纸本)9781450359528
Modern microcontrollers come with a selection of clock sources that have widely differing frequencies and power consumptions. For applications whose workloads vary over time, dynamically changing the clock can provide significant energy savings. the varying constraints of embedded hardware environments and the complex interactions of multiprogrammed systems makes this approach burdensome to do in application logic. Power Clocks orchestrates energy optimizing clock management in the kernel, obviating the need for application involvement while still achieving acceptable performance for typical workloads. this poster describes Power Clocks's design and presents preliminary results.
Low-Power Wide-Area Network (LPWAN) heralds a promising class of technology to overcome the range limits and scalability challenges in traditional wireless sensor networks. Recently proposed sensor Network over White ...
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ISBN:
(纸本)9781450354592
Low-Power Wide-Area Network (LPWAN) heralds a promising class of technology to overcome the range limits and scalability challenges in traditional wireless sensor networks. Recently proposed sensor Network over White Spaces (SNOW) technology is particularly attractive due to the availability and advantages of TV spectrum in long-range communication. this paper proposes a new design of SNOW that is asynchronous, reliable, and robust. It represents the first highly scalable LPWAN over TV white spaces to support reliable, asynchronous, bi-directional, and concurrent communication between numerous sensors and a base station. this is achieved through a set of novel techniques. this new design of SNOW has an OFDM based physical layer that adopts robust modulation scheme and allows the base station using a single antennaradio (1) to send different data to different nodes concurrently and (2) to receive concurrent transmissions made by the sensor nodes asynchronously. It has a lightweight MAC protocol that (1) efficiently implements per-transmission acknowledgments of the asynchronous transmissions by exploiting the adopted OFDM design;(2) combines CSMA/CA and location-aware spectrum allocation for mitigating hidden terminal effects, thus enhancing the flexibility of the nodes in transmitting asynchronously. Hardware experiments through deployments in three radio environments -in a large metropolitan city, in a rural area, and in an indoor environment - as well as large-scale simulations demonstrated that the new SNOW design drastically outperforms other LPWAN technologies in terms of scalability, energy, and latency.
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