• Title/Summary/Keyword: wireless optical sensor network

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Performance Analysis of Scanning Scheme Using ToF for the Localization of Optics-Based Sensor Node (광신호 기반 무선 센서 노드 위치 인식을 위한 ToF 기법의 성능 분석)

  • Jang, Woo Hyeop;Park, Chan Gook
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.3
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    • pp.268-274
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    • 2013
  • In this paper, the performance analysis of optics-based sensor node localization using ToF (Time of Flight) scheme is conducted. Generally, the position of the sensor node is calculated on the base station. And the base station scans neighboring sensor nodes with a laser. The laser which is reflected from one sensor node, however, can be reached to the base station at different angles according to the scanning resolution. This means that the error of the reached angle can increase and one node may be recognized as different nodes. Also the power of laser can decrease because the laser signal spread. Thus the sensor node which is located at a long distance from the base station cannot be detected. In order to overcome these problems which can be occurred in localization using ToF, the beam spot, the scanning resolution, the size of reflector and the power of laser at the sensor node were analyzed. It can be expected that the consequence of analysis can be provided in acquisition of accurate position of sensor node and construction of optics-based sensor node localization system.

Development of a Monitoring Equipment of Current and Potential on Power Transmission Line for 66kV

  • Nisiyama, Eiji;Kuwanami, Kenshi;Kawano, Mitsunori;Matsuda, Toyonori;Oota, I.
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.41-44
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    • 2003
  • We propose portable equipment that monitors current and voltage of high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to an insulator that supports a power transmission line: A clamped to the power line and the detected current signal is transmitted to the ground station by a wireless optical link using transmission line is detected by a high resistance element, zinc oxide (ZnO). That acts as a potential divider between the power line and ground. We make an experimental device for 66kV power line and demonstrate that it can monitor currents proposed equipment is small-sized, light, and inexpensive in comparison with the conventional CT (current transformer) and PT (potential transformer) since it does not require high potential insulators and magnetic cores, further, the equipment is easily installed owing to its small size and its simple structure.

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Flicker-Free Spatial-PSK Modulation for Vehicular Image-Sensor Systems Based on Neural Networks (신경망 기반 차량 이미지센서 시스템을 위한 플리커 프리 공간-PSK 변조 기법)

  • Nguyen, Trang;Hong, Chang Hyun;Islam, Amirul;Le, Nam Tuan;Jang, Yeong Min
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.8
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    • pp.843-850
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    • 2016
  • This paper introduces a novel modulation scheme for vehicular communication in taking advantage of existing LED lights available on a car. Our proposed 2-Phase Shift Keying (2-PSK) is a spatial modulation approach in which a pair of LED light sources in a car (either rear LEDs or front LEDs) is used as a transmitter. A typical camera (i.e. low frame rate at no greater than 30fps) that either a global shutter camera or a rolling shutter camera can be used as a receiver. The modulation scheme is a part of our Image Sensor Communication proposal submitted to IEEE 802.15.7r1 (TG7r1) recently. Also, a neural network approach is applied to improve the performance of LEDs detection and decoding under the noisy situation. Later, some analysis and experiment results are presented to indicate the performance of our system