• Title/Summary/Keyword: 라디오비콘

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An Efficient Beacon Management Technique for Senor Network-Based Indoor Location Systems (센서네트워크 기반의 실내 위치인식 시스템에서 효율적인 비콘 관리 기법)

  • Kim, Jong-Hyun;Chung, Kwang-Sue
    • Journal of KIISE:Information Networking
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    • v.36 no.4
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    • pp.330-338
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    • 2009
  • Various applications based on the location information of things are developed as entering by the ubiquitous computing age. Wireless sensor networks are suitable to indoor location-based service because of the important features such as low-power consumption, low-cost, easy deployment, etc. To recognize the distance between nodes, the indoor location-based system transmits both ultrasound signal and radio signal periodically. However, increment of the number of deployed sensor nodes make lots of collision and interference among the signals and it can degrade the accuracy of location-based system. In this paper, we propose a beacon management mechanism to increase the probability of transmission chance to the nearest beacon from the listener. It can minimize collision and interference and reduce the error probability due to the characteristics of ultrasound.

A Study on the DGPS Radiobeacon Propagation Measurement of Domestic Ferry Lines (우리나라 선박 항로구간의 DGPS 전파 특성에 관한 연구)

  • Jeon, Joong-Sung;Lee, Seo-Jeong
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.4
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    • pp.491-499
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    • 2011
  • Starting with maritime DGPS base stations of Palmido, Ochongdo which have been operated since 1999, truly our nation has become the most powerful country possessed with total of 17 DGNSS base stations in the field of DGNSS operation infrastructure. This paper examines into the country's DGNSS services as measuring the service range of the maritime DGPS base stations in the domestic ferry lines which sections are from Jeju to Incheon, from Busan to Jeju, from Jeju to Nokdong, the propagation characteristics of the radio waves of 300 kHz bands on sea and land path. As a result of identifying the service range of the DGPS in the sea routes of the southern sea and the western sea, the measured results of the DGPS signals are confirmed more than 100 NM(recommended service range). It can be possible to practical use the position information, which is safe navigation and various marine traffic management systems. It will be useful an expansion of maritime DGPS reference station in the near future.

Unauthorized person tracking system in video using CNN-LSTM based location positioning

  • Park, Chan;Kim, Hyungju;Moon, Nammee
    • Journal of the Korea Society of Computer and Information
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    • v.26 no.12
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    • pp.77-84
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    • 2021
  • In this paper, we propose a system that uses image data and beacon data to classify authorized and unauthorized perosn who are allowed to enter a group facility. The image data collected through the IP camera uses YOLOv4 to extract a person object, and collects beacon signal data (UUID, RSSI) through an application to compose a fingerprinting-based radio map. Beacon extracts user location data after CNN-LSTM-based learning in order to improve location accuracy by supplementing signal instability. As a result of this paper, it showed an accuracy of 93.47%. In the future, it can be expected to fusion with the access authentication process such as QR code that has been used due to the COVID-19, track people who haven't through the authentication process.