• 예술인문사회 융합 멀티미디어 논문지
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• 제8권6호
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• pp.957-966
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• 2018

최근 들어 고령화 및 1인 가구 증가로 인해 IoT기반 원격환자모니터링에 대한 요구가 증대되고 있다. 본 논문에서는 원격환자모니터링을 위한 다중의 IR-UWB레이더를 이용한 비접촉식 생체신호측정시스템을 제안하였다. 기존에는 생체신호처리를 위해 배경차분알고리즘을 적용하였으나, 전압노이즈, 계단현상 등의 에러 발생을 없애고자 다중 배경차분 알고리즘을 적용하였다. 다중배경차분알고리즘은 이전 클러터와 현재 클러터의 변화량을 계산하여 신호를 추출하며, 본 연구에서는 SVD알고리즘을 이용하였다. 개선된 다중배경차분알고리즘을 생체신호측정에 응용하여 고속 푸리에 변환을 통해 호흡수를 계산하였다. 제안한 IR-UWB레이더를 이용한 시스템 및 다중배경차분알고리즘의 검증을 위해 호흡수 측정을 진행하였다. Neulog사의 부착형 공기압착식 호흡측정기를 대조군으로 실험한 결과 97.36%의 정밀도를 확보함으로서 본 연구의 타당성을 검증하였다. 구현된 알고리즘은 기존의 접촉식 웨어러블 방식의 불편함을 개선하였다.

• 한국인터넷방송통신학회논문지
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• 제18권4호
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• pp.211-218
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• 2018

근래에는 IoT 및 스마트팩토리 산업분야의 확산으로 인하여 IIoT와 관련한 다양한 기술들이 지속적으로 소개되고 있다. 본 논문에서는 이러한 다양한 기술들을 이용한 공장 설비 감시용 양방향 무선 네트워크 시스템의 구축을 제안한다. 본 논문에서 사용되는 주요 기술들은 다양한 현장의 설비상태를 모니터링하기 위한 초소형 센서 노드의 설계기술, 개별 센서 노드에서 처리된 다양한 정보를 무선 시스템을 이용해 서버로 전송하고 또한 서버에서 새롭게 설정된 각종 센서의 임계치들을 개별 센서 노드로 무선 전송하기 위한 Wi-Fi 기반의 MQTT 기술, 수집된 데이터를 저장하고 유무선으로 사용자에게 손쉽게 표시할 수 있는 Node-RED 기반의 설계 기술 등이다. 아울러 개별 센서 노드에서의 이상상태의 판단시에 이를 상황실로 알리고 상황실의 무선조정에 의해 현장의 화면영상을 상황실에서 확인할 수 있는 무선 양방향 카메라 시스템도 함께 구현하였다.

• International journal of advanced smart convergence
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• 제8권4호
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• pp.16-25
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• 2019

The Internet of things (IOT) is remodeling the agribusiness empowering the agriculturists through the extensive range of strategies, for example, accuracy as well as practical farming to deal with challenges in the field. The paper aims making use of evolving technology i.e. IoT and smart agriculture using automation. The objective of this research paper to present tools and best practices for understanding the role of information and communication technologies in agriculture sector, motivate and make the illiterate farmers to understand the best insights given by the big data analytics using machine learning. The methodology used in this system can monitor the humidity, moisture level and can even detect motions. According to the data received from all the sensors the water pump, cutter and sprayer get automatically activated or deactivated. we investigate a remote monitoring system using Wi-Fi. These nodes send data wirelessly to a central server, which collects the data, stores it and will allow it to be analyzed then displayed as needed and can also be sent to the client mobile.

• 사물인터넷융복합논문지
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• 제6권1호
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• pp.17-22
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• 2020

본 논문은 사물인터넷 기반의 스마트 휴지통에 관한 연구이다. 현대 사회에서 쓰레기 처리는 여러 사회 문제를 일으킨다. 특히 유동인구가 많은 주말의 도심에서 쓰레기 처리 용량이 쓰레기 배출량을 따라가지 못해 문제가 발생하고 있다. 넘쳐나는 쓰레기로 악취가 발생하고, 미관을 해지고, 벌레가 생기는 등의 문제가 있다. 이러한 문제를 해결하기 위해 스마트 휴지통을 제안하였다. 제안된 스마트 휴지통은 쓰레기 압축 기능, 휴지통 자동 개폐 기능, 쓰레기양 표시기능, 휴지통 모니터링 및 제어 기능을 제공한다. 제안된 스마트 휴지통은 유동인구가 많은 옥외의 쓰레기 처리에 유용하게 활용될 수 있을 것으로 기대한다.

• 한국멀티미디어학회논문지
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• 제21권8호
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• pp.897-908
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• 2018

In this paper, we propose a security framework for a cluster drones network using the MAVLink (Micro Air Vehicle Link) application protocol based on FANET (Flying Ad-hoc Network), which is composed of ad-hoc networks with multiple drones for IoT services such as remote sensing or disaster monitoring. Here, the drones belonging to the cluster construct a FANET network acting as WTRP (Wireless Token Ring Protocol) MAC protocol. Under this network environment, we propose an efficient algorithm applying the Lightweight Encryption Algorithm (LEA) to the CTR (Counter) operation mode of WPA2 (WiFi Protected Access 2) to encrypt the transmitted data through the MAVLink application. And we study how to apply LEA based on CBC (Cipher Block Chaining) operation mode used in WPA2 for message security tag generation. In addition, a modified Diffie-Hellman key exchange method is approached to generate a new key used for encryption and security tag generation. The proposed method and similar methods are compared and analyzed in terms of efficiency.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.890-891
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• 2015

최근 한국은 고령화 사회에 접어들면서 독거노인의 사회적 관계들이 단절로 인한 위험이 높아지고 있으며, 이에 따른 사회적 관계 회복과 일상생활 능력을 보조할 수 있는 건강검진, 간병서비스, 가사서비스, 필요한 정보 제공을 위한 콘텐츠 구성 등의 대안 마련이 필요로 하고 있다. 본 논문에서는 고령자 및 돌봄이 필요한 휴먼케어 시스템으로 건강상태 모니터링를 위한 IoT 환경에서의 스마트폰 애플리케이션으로 다양한 콘텐츠를 결합한 상황인식, 체감, 센서 모듈을 결합한 소형화, 휴대성이 가능한 휴먼케어 시스템을 제안한다.

• International Journal of Contents
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• 제15권2호
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• pp.75-78
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• 2019

The Integration technique of combining the measurement method with the fine precision of the sensor collecting the satellite-based information to determine the displacement space is available to a variety of diagnostic information. The measurement method by a GNSS with the sensors is needed since there will always be occasional occurrence of natural disasters caused by various environmental factors and the surroundings. Such attempts carried out nationally by distributed torsional displacement of the terrain and facilities. The combination of the various positioning analysis of mm-class for the facility of main area observed is required constantly in real time information of the USN/IoT Smart sensors and should be able to utilize such information as a precisely fine positioning information for the precisely fine displacement of the semi-permanent main facilities. In this study, for the installation of the receiving system, the USN/IoT base line positioning are easily accessible for the target bridges. Transmitting hourly from the received data is also executed in real time using the wireless Wi-Fi/Bluetooth bridges and related facilities to automatically process a fine position displacement. The results obtained from this method can be analyzed by real-time monitoring for a large structure or facilities for disaster prevention.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1123-1140
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• 2019

Many Internet of Things (IoT) applications involving bursty traffic have emerged recently with event detection. A power management scheme qualified for uplink bursty traffic (PM-UBT) is proposed by distinguishing between bursty and general uplink traffic patterns in the IEEE 802.11 standard to balance energy consumption and uplink latency, especially for stations with limited power and constrained buffer size. The proposed PM-UBT allows a station to transmit an uplink bursty frame immediately regardless of the state. Only when the sleep timer expires can the station send uplink general traffic and receive all downlink frames from the access point. The optimization problem (OP) for PM-UBT is power consumption minimization under a constrained buffer size at the station. This OP can be solved effectively by the bisection method, which demonstrates a performance similar to that of exhaustive search but with less computational complexity. Simulation results show that when the frame arrival rate in a station is between 5 and 100 frame/second, PM-UBT can save approximately 5 mW to 30 mW of power compared with an existing power management scheme. Therefore, the proposed power management strategy can be used efficiently for delay-intolerant uplink traffic in event-driven IoT applications, such as health status monitoring and environmental surveillance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권12호
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• pp.4385-4399
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• 2021

The Internet of Things (IoT) eHealth systems composed by Wireless Body Area Network (WBAN) has emerged recently. Sensor nodes are placed around or in the human body to collect physiological data. WBAN has many different applications, for instance health monitoring. Since the limitation of the size of the battery, besides speed, reliability, and accuracy; design of WBAN protocols should consider the energy efficiency and time delay. To solve these problems, this paper adopt the end-edge-cloud orchestrated network architecture and propose a transmission based on reinforcement algorithm. The priority of sensing data is classified according to certain application. System utility function is modeled according to the channel factors, the energy utility, and successful transmission conditions. The optimization problem is mapped to Q-learning model. Following this online power control protocol, the energy level of both the senor to coordinator, and coordinator to edge server can be modified according to the current channel condition. The network performance is evaluated by simulation. The results show that the proposed power control protocol has higher system energy efficiency, delivery ratio, and throughput.

• International Journal of Computer Science & Network Security
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• 제22권11호
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• pp.33-42
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• 2022

One of the most pressing socioeconomic problems confronting humanity on a worldwide scale is food security, particularly in light of the expanding population and declining land productivity. These causes have increased the number of people in the world who are at risk of starving and have caused the natural ecosystems to degrade at previously unheard-of speeds. Happily, the Internet of Things (IoT) development provides a glimmer of light for those worried about food security through smart agriculture-a development that is particularly relevant to automating food production operations in order to reduce labor expenses. When compared to conventional farming techniques, smart agriculture has the benefit of maximizing resource use through precise chemical input application and regulation of environmental factors like temperature and humidity. Farmers may make data-driven choices about the possibility of insect invasion, natural disasters, anticipated yields, and even prospective market shifts with the use of smart farming tools. The technical foundation of smart agriculture serves as a potential response to worries about food security. It is made up of wireless sensor networks and integrated cloud computing modules inside IoT.