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13351 Publications
collected from a compatible aggregator


  • Analysis of a Smartphone-Based Architecture with Multiple Mobility Sensors for Fall Detection with Supervised Learning

    José Antonio Santoyo-Ramón; Eduardo Casilari; José Manuel Cano-García (2018)
    This paper describes a wearable Fall Detection System (FDS) based on a body-area network consisting of four nodes provided with inertial sensors and Bluetooth wireless interfaces. The signals captured by the nodes are sent to a smartphone which simultaneously acts as another sensing point. In contrast to many FDSs proposed by the literature (which only consider a single sensor), the multisensory nature of the prototype is utilized to investigate the impact of the number and the positions of t...

    A New Black Carbon Sensor for Dense Air Quality Monitoring Networks

    Julien J. Caubel; Troy E. Cados; Thomas W. Kirchstetter (2018)
    Low-cost air pollution sensors are emerging and increasingly being deployed in densely distributed wireless networks that provide more spatial resolution than is typical in traditional monitoring of ambient air quality. However, a low-cost option to measure black carbon (BC)—a major component of particulate matter pollution associated with adverse human health risks—is missing. This paper presents a new BC sensor designed to fill this gap, the Aerosol Black Carbon Detector (ABCD), which incor...

    Artificial Vector Calibration Method for Differencing Magnetic Gradient Tensor Systems

    Qingzhu Li; Zhining Li; Yingtang Zhang; Gang Yin (2018)
    The measurement error of the differencing (i.e., using two homogenous field sensors at a known baseline distance) magnetic gradient tensor system includes the biases, scale factors, nonorthogonality of the single magnetic sensor, and the misalignment error between the sensor arrays, all of which can severely affect the measurement accuracy. In this paper, we propose a low-cost artificial vector calibration method for the tensor system. Firstly, the error parameter linear equations are constru...

    High-Precision Ionosphere Monitoring Using Continuous Measurements from BDS GEO Satellites

    Haiyan Yang; Xuhai Yang; Zhe Zhang; Kunjuan Zhao (2018)
    The current constellation of the BeiDou Navigation Satellite System (BDS) consists of five geostationary earth orbit (GEO) satellites, five inclined geosynchronous satellite orbit (IGSO) satellites, and four medium earth orbit (MEO) satellites. The advantage of using GEO satellites to monitor the ionosphereis the almost motionless ionospheric pierce point (IPP), which is analyzed in comparison with the MEO and IGSO satellites. The results from the analysis of the observations using eight trac...

    An Energy-Efficient Compressive Image Coding for Green Internet of Things (IoT)

    Ran Li; Xiaomeng Duan; Xu Li; Wei He; Yanling Li (2018)
    Aimed at a low-energy consumption of Green Internet of Things (IoT), this paper presents an energy-efficient compressive image coding scheme, which provides compressive encoder and real-time decoder according to Compressive Sensing (CS) theory. The compressive encoder adaptively measures each image block based on the block-based gradient field, which models the distribution of block sparse degree, and the real-time decoder linearly reconstructs each image block through a projection matrix, wh...
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