With the pervasive influence of rich sensing technologies and internet connectivity, Social Sensing based Edge computing (SSEC) is gradually becoming the forefront of context-aware sensing applications in smart cities...
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Wireless sensor Networks is growing very fast in today's era. The ideas of of this circuitry's digital is, wireless transceiver, and micro electro-mechanical systems (MIELMESY) has made it possible that all th...
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The dynamic measurement of strain is needed in several applications where frequent bending is experienced. For example, in the case of robotics and prosthesis, the strain sensors could indicate the bending of fingers ...
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ISBN:
(纸本)9781538693049
The dynamic measurement of strain is needed in several applications where frequent bending is experienced. For example, in the case of robotics and prosthesis, the strain sensors could indicate the bending of fingers or hand joints [1] , [2] . Likewise, it is needed to detect the damages to interconnects due to frequent bending in the flexible and wearable electrouics [3] - [5] . To this end, microchannel based teclmology can provide an efficient solution. This paper presents a flexible microfluidic channel-based sensor for the detection of dynamic strain. The sensor has been developed using Polydimethylsiloxane (PDMS). The micro-channel (dia~175 pm), fabricated using replica molding technique, was made conductive by filling with poly (3.4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) polymer. The developed strain sensor was subjected to various strains, which led to changes in the channel diameter and hence the resistance. We observed about 3 order (Δ R / R ~2800) increase in the resistance ( R ) value for 10% applied strain (Δ L / L. L = length of sensor) This lead to a gauge factor (GF= (Δ R / R )/(Δ L / L )) of ~280 for 10% applied strain, which is better (~70 tunes) than reported polymer based strain sensors [6] - [9] .
Dense distributedsensorsystems deployed to monitor and control the built environment open up wide application areas for improving the quality of life through smart spaces. By implementing these systems in residentia...
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ISBN:
(纸本)9781728140698
Dense distributedsensorsystems deployed to monitor and control the built environment open up wide application areas for improving the quality of life through smart spaces. By implementing these systems in residential or commercial buildings, more efficient, pervasive, real-time and finally more robust decision support is achieved. As one of the key tasks, high accuracy occupancy detection and estimation within buildings offers the potential to improve HVAC utilization while reducing maintenance needs, enhancing energy savings for building operators as well as a more suitable thermal comfort for occupants. In this context the main contribution of the paper consists of an assessment of supervised machine learning techniques namely random forests and extreme machine learning neural networks for indirect occupancy profile estimation. The methods are applied on a benchmarking dataset of indoor carbon dioxide measurements and ventilation damper positions as collected from the building information system. The impact of data preprocessing through filtering and smoothing as well as hardware constraints and cloud distributed processing for algorithm deployment are also discussed. We highlight key challenges and discuss how the learned models can be integrated for online operation to improve energy efficiency.
In recent years, the implementation of distributedsensor networks has been allowing to create more and more sophisticated systems especially for environment monitoring. Among those applications are detecting, locatin...
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This paper presents a novel quartz crystal resonator (QCR) sensor, which embeds a conductive planar coil connected to the QCR electrodes that enables electromagnetic contactless interrogation techniques. The planar co...
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ISBN:
(纸本)9781538693049
This paper presents a novel quartz crystal resonator (QCR) sensor, which embeds a conductive planar coil connected to the QCR electrodes that enables electromagnetic contactless interrogation techniques. The planar coil and the QCR electrodes are printed on a 330 μm-thick bare piezoelectric quartz crystal exploiting the aerosol-jet printing technology. The printed coil acts as the secondary coil of a pair of coupled inductors, allowing for a self-contained sensing element which avoids the need to connect an external coil for interrogation. The adopted interrogation technique, which advantageously enables distance-independent operation, is based on the measurement of the reflected impedance of the QCR sensor through the planar primary coil of the coupled inductors. The resonant frequency of the QCR has been measured without contact using the primary coil connected to an impedance analyser. The measured resonant frequency is 4.790260 MHz, and has a maximum deviation of about 50 Hz, i.e. 10.5 ppm, with respect to reference measurements taken via contact probes. Contactless operation distances up to 12.2 mm have been obtained.
This paper presents a printed microwave humidity sensor with an original sensing principle in phase shifting para- digm, derived from the combination of slots, transmission lines and printing technologies. A composite...
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Viewshed analysis is an indispensable part of digital terrain analysis and is widely used in many application domains. High-resolution raster DEM data bring significant computational challenges to the existing viewshe...
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This research presents the results of an innovative process that relies on three sequential steps for silver nanowire (AgNWs) post processing to improve the stability and electrical performance: thermal embossing, inf...
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ISBN:
(纸本)9781538693049
This research presents the results of an innovative process that relies on three sequential steps for silver nanowire (AgNWs) post processing to improve the stability and electrical performance: thermal embossing, infrared sintering and plasma treatment. By conducting the three processing steps, a demonstration of a highly conductive film with a sheet resistance of 2.5 Ω sq −1 and high transmittance of over 85% is possible. This is one of the highest performing AgNWs electrodes reported to date. Moreover, we show that the stability to electrical biasing is greatly enhanced by conducting the post processing, thus improving the industrial applicability of the technology.
UV radiation from the sun is the primary cause of skin cancer and warrants continuous monitoring to prevent excessive exposure. Accordingly, we present a wearable, capacitive UV sensor based on ZnO thin-film coated PV...
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