• Title/Summary/Keyword: LoRaWAN

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Through-the-inner Bulkhead Signal Characteristics and Distance based Analysis on Receiving Rate using LoRaWAN (LoRaWAN을 이용한 선박 내부 격벽통과 신호의 특성 및 거리에 따른 수신율 분석)

  • Park, Moon Su;Oh, Jung Soo
    • Journal of Korea Multimedia Society
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    • v.23 no.2
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    • pp.255-261
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    • 2020
  • As the accidents of cargo and passenger carrying ships occur, the stress faced by the vessel users is increasing. The risk factors for accident deterioration in remote marine area are stronger than those in road accidents, and therefore the need for safety control is greatly emphasized. To overcome such issue, a lot of effort has been made in terms of conducting research and development of the passengers and freights location tracking system. However, the inner bulkhead structures are made of aluminum/steel which is a difficult material to transfer location information through. This study aims to measure the receiving rate of LoRaWAN signal inside the aluminum/steel bulkhead structures with variation in reception strength and distance. The test was taken place at platforms with 6T and 8T enclosures to reflect the same conditions found in fishery patrol boats. The receiving rate of through-the-wall communication at 10M distance turned out to be 86% in case of using two 6T enclosures, and 73% in case of using one 8T enclosure. The result showed that the receiving rate was more affected by the thickness rather than the number of enclosures.

Design and Application of LoRa-based Network Protocol in IoT Networks (사물 네트워크에서 LoRa 기반 네트워크 프로토콜 설계 및 적용)

  • Lee, Sung-Keun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.6
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    • pp.1089-1096
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    • 2019
  • Recently, small-scale IoT services using a small amount of information through low-performance computing have been spread. It requires low cost, low-power, and long-distance communication technologies with wide communication radius, relatively low power consumption. This paper proposes a MAC layer and routing protocol that supports multi-hop transmission in small-scale IoT environment distributed over a large area based on LoRa communication and delivering a small amount of sensing data. The terminal node is mobile and the communication type provides bidirectional transmission between the terminal node and the network application server. By applying the proposed protocol, a production line monitoring system for smart factory was implemented. It was confirmed that the basic monitoring functions are normally performed.

The Smart Outdoor Cultivation System using Internet of Things (사물인터넷을 이용한 지능형 노지 농작물 관리 시스템 개발)

  • Youm, Sungkwan;Hong, SungKwang;Koh, Wan-Ki
    • Journal of the Korea Convergence Society
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    • v.9 no.7
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    • pp.63-68
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    • 2018
  • Research on smart farms centering on greenhouse cultivation is actively under way due to the decrease in agriculture population and aging, but in the case of vegetables such as vegetables, outdoor cultivation is 70%. Therefore, there is a need to improve productivity and prevent soil contamination by automating, cultivating, and intelligentizing the outdoor cultivation of agriculture crops. In this paper, we show the case of establishing a outdoor production system using the Internet of things and define the environmental variables in the outdoor production system. By measuring soil temperature, water content, electrical conductivity and acidity through sensors, LoRa communication module transmits the information to the outdoor production system. The outdoor production system controls the amount of fertilizer and the volume of water based on this sensor data. We have developed a system that manages a wide range of crops using LoRa technology, which is a suitable communication method for cultivating crops, and manages production volume and sales performance.

Exploiting Spatial Reuse Opportunity with Power Control in loco parentis Tree Topology of Low-power and Wide-area Networks (대부모 트리 구조의 저 전력 광역 네트워크를 위한 전력 제어 기반의 공간 재사용 기회 향상 기법)

  • Byeon, Seunggyu;Kim, Jong Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.2
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    • pp.239-250
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    • 2022
  • LoRa is a physical layer technology designed to secure highly reliable long-range communication with introducing loco parentis tree network and chirp spreading spectrum. Since since a leaf can send message to more than one parents simultaneously with a single transmission in a region, packet delivery ratio increases logarithmically as the number of gateways increases. The delivery ratio, however, dramatically collapses even under loco parentis tree topology due to the limitations of ALOHA-like primitive MAC, . The proposed method is intended to exploit SDMA approach to reuse frequency in an area. With the view, TxPower of each sender for each message in a concurrent transmission is elaborately controlled to survive the collision at different gateway. Thus, the gain from the capture effect improves the capacity of resource-hungry Low Power and Wide Area Networks.

Implementation of IoT Application using Geofencing Technology for Mountain Management (산악 관리를 위한 지오펜싱 기술을 이용한 IoT 응용 구현)

  • Hyeok-jun Kweon;Eun-Gyu An;Hoon Kim
    • Journal of Advanced Navigation Technology
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    • v.27 no.3
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    • pp.300-305
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    • 2023
  • In this paper, we confirmed that an efficient sensor network can be established at a low cost by applying Geofencing technology to a LoRa-based sensor network and verified its effectiveness in disaster management such as forest fires. We detected changes through GPS, gyro sensors, and combustion detection sensors, and defined the validity size of the Geofencing cell accurately. We proposed a LoRa Payload Frame Structure that has a flexible size according to the size of the sensor information.

Exploiting Spatial Reuse Opportunity with Power Control in loco parentis Tree Topology of Low-power and Wide-area Networks (대부모 트리 구조의 저 전력 광역 네트워크를 위한 전력 제어 기반의 공간 재사용 기회 향상 기법)

  • Byeon, Seunggyu;Kim, JongDeok
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.10a
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    • pp.194-198
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    • 2021
  • LoRa is a physical layer technology that is designed to provide a reliable long-range communication with introducing CSS and with introducing a loco parentis tree network. Since a leaf can utilize multiple parents at the same time with a single transmission, PDR increases logarithmically as the number of gateways increases. Because of the ALOHA-like MAC of LoRa, however, the PDR degrades even under the loco parentis tree topology similarly to the single-gateway environment. Our proposed method is aimed to achieve SDMA approach to reuse the same frequency in different areas. For that purpose, it elaborately controls each TxPower of the senders for each message in concurrent transmission to survive the collision at each different gateway. The gain from this so-called capture effect increases the capacity of resource-hungry LPWAN. Compared to a typical collision-free controlled-access scheme, our method outperforms by 10-35% from the perspective of the total count of the consumed time slots. Also, due to the power control mechanism in our method, the energy consumption reduced by 20-40%.

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A Study on IoT/LPWA-based Low Power Solar Panel Monitoring System for Smart City (스마트 시티용 IoT/LPWA 기반 저전력 태양광 패널 모니터링 시스템에 관한 연구)

  • Trung, Pham Minh;Mariappan, Vinayagam;Cha, Jae Sang
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.18 no.1
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    • pp.74-82
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    • 2019
  • The revolution of industry 4.0 is enabling us to build an intelligent connection society called smart cities. The use of renewable energy in particular solar energy is extremely important for modern society due to the growing power demand in smart cities, but its difficult to monitor and manage in each buildings since need to be deploy low energy sensors and information need to be transfer via wireless sensor network (WSN). The Internet of Things (IoT) / low-power wide-area (LPWA) is an emerging WSN technology, to collect and monitor data about environmental and physical electrical / electronics devices conditions in real time. However, providing power to IoT sensor end devices and other public electrical loads such as street lights, etc is an important challenging role because the sensor are usually battery powered and have a limited life time. In this paper, we proposes an efficient solar energy-based power management scheme for smart city based on IoT technology using LoRa wide-area network (LoRaWAN). This approach facilitates to maintain and prevent errors of solar panel based energy systems. The proposed solution maximizing output the power generated from solar panels system to distribute the power to the load and the grid. In this paper, we proved the efficiency of the proposed system with Simulink based system modeling and real-time emulation.

System Implementation for Dew Condensation Prevention of Distributing Boards based on the Dew Point (이슬 결로점 기반 수배전반 결로 방지 장치 제작)

  • Kim, Tae-Myoung;Jee, Suk-Kun;Kim, Young-Wan
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.645-650
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    • 2018
  • IT-based automatic controller that control the temperature and humidity to prevent dew condensation of distributing board was designed and implemented in this paper. The dew condensation temperature was deduced from room temperature and humidity of distributing board. Based on the comparisons between the deduced dew condensation temperature and the temperature of surface condensation, the facilities that can prevent the condensation was implemented to be operated in due order. Also, the remote monitoring module to monitor operation status of controller was implemented using LoRa technique. The performances for controller operation and data transmission were validated from the transmission and operation test for dew condensation prevention. The controller can be put to good use at the facilities that requires the condensation prevention.

Design and Function Analysis of Dust Measurement Platform based on IoT protocol (사물인터넷 프로토콜 기반의 미세먼지 측정 플랫폼 설계와 기능해석)

  • Cho, Youngchan;Kim, Jeongho
    • Journal of Platform Technology
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    • v.9 no.4
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    • pp.79-89
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    • 2021
  • In this paper, the fine dust (PM10) and ultrafine dust (PM2.5) measurement platforms are designed to be mobile and fixed using oneM2M, the international standard for IoT. The fine dust measurement platform is composed and designed with a fine dust measurement device, agent, oneM2M platform, oneM2M IPE, and monitoring system. The main difference between mobile and fixed is that the mobile uses the MQTT protocol for interconnection between devices and services without blind spots based on LTE connection, and the fixed uses the LoRaWAN protocol with low power and wide communication range. Not only fine dust, but also temperature, humidity, atmospheric pressure, volatile organic compounds (VOC), carbon monoxide (CO), sulfur dioxide (SO2), nitrogen dioxide (NO2), and noise data related to daily life were collected. The collected sensor values were managed using the common API provided by oneM2M through the agent and oneM2M IPE, and it was designed into four resource types: AE and container. Six functions of operability, flexibility, convenience, safety, reusability, and scalability were analyzed through the fine dust measurement platform design.