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A Disembarking Notification System in Public City Buses using Smart Device and High Frequency

  • 투고 : 2020.07.30
  • 심사 : 2020.08.20
  • 발행 : 2020.08.31

초록

최근 대중교통을 이용하면서 스마트 기기를 이용하여 유투브, 넷플릭스, 왓챠 등과 같은 동영상이나 음악을 즐기는 사람들이 많아졌다. 그러나 이러한 현상으로 사람들은 자신이 하차해야 할 곳을 지나쳐 내리는 경우가 빈번히 발생한다. 따라서 본 논문에서 우리는 버스 내부의 스피커에서 발생하는 고주파 신호를 이용한 스마트 기기 기반 시내 공공 버스 하차 알림 서비스 시스템을 구축하였다. 고주파 신호는 버스의 정류장 안내 방송과 함께 발생하며, 스마트 기기는 내장 마이크를 통해 입력되는 신호를 분석하여 사용자가 설정한 하차 역에 도달할 경우 스마트 기기에서 하차 알림을 발생한다. 제안 애플리케이션과 서비스 시스템의 성능 검증을 위해 총 1,000 번의 실시간 알림을 측정하였으며, 그 결과 제안 시스템은 98.9%의 정확도를 나타냈으며, 기존 Open API만을 이용한 알림 서비스에 비해 우수한 성능을 보였다. 따라서 제안 시스템은 시내 공공 버스를 이용하는 사람들에게 목적지 도착 시 하차 지점을 정확히 알려줄 수 있는 유용한 기술이 될 것이다. 또한, 이 기술은 스피커로 도착지를 안내 방송하는 세계의 다양한 대중교통 서비스에 활용할 수 있는 우수한 기술이 될 것이다.

Recently, people have come to enjoy using movies and music applications, such as YouTube, Netflix, and Watcha Play, on their smart devices while riding public transportation. However, they sometimes miss their destination stations because of these activities. Therefore, in this paper, we propose a disembarking notification system for public city buses using smart devices and high frequencies generated via the buses' speakers. The high frequencies are generated by the public buses' station information broadcasters. Smart devices then analyze the high-frequency signals with their inner microphones, and the proposed application displays a disembarking notification to the user when the user's destination or stop-over station's signal is the same. To evaluate this system's performance, we tested 1,000 real-time disembarking notifications, and the test results showed 98.9% accuracy. Moreover, we compared these results to those using only OpenAPI, and our proposed system featured far better outcomes. Thus, this proposed notification system can prove a useful technology for many people who often use public city buses, as it can notify specific users of their destination stations. Furthermore, this system will become innovative technology for global public transportation by informing users of their desired stations using speakers.

키워드

참고문헌

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피인용 문헌

  1. User Visit Certification System using Inaudible Frequency vol.26, pp.7, 2020, https://doi.org/10.9708/jksci.2021.26.07.057