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- 저자 : 이정준(Jung J. Lee) (검색결과 2 건)
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오봉식(Bong S. Oh),박상철(Sang C. Park),장중순(Joong S. Jang),이정준(Jung J. Lee) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.3
Purpose: Reliability and safety-based message queuing telemetry transport (MQTT) communication applications and artificial intelligence (AI)-smart sensor development are considered in the smart factory to ensure competitiveness by minimizing risks in manufacturing, pre-failure diagnosis, and failure prediction prognostics and health management (PHM) technology. Methods: The algorithm was implemented to ensure that the MQTT Publisher software technology application conforms to the standard by applying it as a process design method in the smart factory. In the functional safety standard and reliability prediction methods, safety risk data were collected, analyzed, and verified as an evaluation procedure in the smart factory. Results: The performance of MQTT communication as well as the safety data collection and database (DB) storage functions were confirmed in the smart factory. The contents of the literature search were confirmed in relation to the evaluation of the reliability feature extraction factors and functional safety-related failure prognosis parameters of the AI-smart sensor, center control server, monitoring-related design, and development products to be used as the basis for reliability and safety in smart factories. Conclusion: The process of sensor input using Arduino, the transmission of measured values, and storage of collected data into a DB using the resistive temperature device was developed as a software algorithm and demonstrated in the smart factory using MQTT communication. According to a literature search related to priority-based MQTT, this partial application can be effectively used in small and medium-sized smart factories that require a real-time priority algorithm. It can be used as a price-competitive communication method.
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스마트센서시스템의 기능안전을 위한 Lora 통신 필드 적합성 테스트 연구
오봉식(Bong S. Oh),박상철(Sang C. Park),장중순(Joong S. Jang),이정준(Jung J. Lee) 한국신뢰성학회 2022 신뢰성응용연구 Vol.22 No.2
Purpose: Three types of LPWA LoRa module were investigated as candidate smart sensor systems in a smart factory. A long-distance communication success test was conducted to determine which module type best satisfied functional safety requirements. Methods: The three types of LoRa communication module considered in this paper were 1. sLory, 2. RYLR890 using UART interface and 3. P2P UART communication module RAK811. A communication success field demonstration test was performed at 3.24 km in the city center and in a flat area (Ansan-si). Results: The RYLR890 module type achieved communication success up to 3 km. However, the communication success rate from departure to arrival was unstable. The RAK811 achieved communication up to 2 km and the field test demonstrated that the transmission/reception performance was stable from departure to arrival. Conclusion: Three types of LoRa module were selected for LPWA and the worlds first field verification test was conducted. It was verified that the RAK811 model’s field communication success rate meets functional safety requirements. However, it is still necessary to ensure the functional safety of sensor-node, communication system and PHM technology by examining structural aspects such as longitudinal axis, lateral side and height.
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