디지털 트윈 연구 및 표준화 동향 분석

윤재석(Yun, Jaeseok),김진민(Kim, Jinmin) 표준인증안전학회 2022 표준인증안전학회지 Vol.12 No.1

디지털 트윈은 물리적 세계와 동일한 디지털 세계를 구현하여 실제 세계의 현상을 모니터링하고 미래를 시뮬레이션하여 최적화하는 4차 산업혁명 시대의 주요 미래 기술이다. 디지털 트윈에 대한 관심과 디지털 트윈을 구성하는 기술들의 급속한 발전에 따라 다양한 연구들이 이뤄지고 있다. 본 연구에서는 2018년 이후 최근 4년간 진행된 디지털 트윈 관련 국내외 기존 연구를 논문 유형, 관련 산업, 구현 단계, 그리고 주요 기술에 따라 분류하였다. 또한, 국내외 표준화 기구에서 진행하고 있는 디지털 트윈 관련 표준화 동향에 대해 조사하여 향후 연구 방향을 제안하고자 한다. 디지털 트윈 관련 연구는 여러 산업 분야에서 이뤄지고 있지만 실제로 디지털 트윈을 적용한 사례의 구현 단계는 디지털 트윈 모델에 속성 정보를 입력하여 단순히 3D 모델링으로 시각화한 1단계와 IoT 플랫폼을 통해 모니터링하는 수준인 2단계가 많았다. 디지털 트윈 실제로 구축한 사례에 대한 연구와 함께 진행되고 있는 일반적인 표준화에 기반하여 각 산업 분야마다의 표준화가 필요한 것으로 보인다. Digital Twin is a major future technology in the era of the Fourth Industrial Revolution to monitor phenomena in the real world, simulate and optimize the future by realizing the same digital world as the physical world. Various studies are being conducted with interest in digital twins and the rapid development of technologies constituting digital twins. In this study, existing Korea and international papers related to digital twins conducted over the past four years were classified according to the type of thesis, related industries, implementation stages, and major technologies. In addition, I would like to propose future research directions by investigating the trend of standardization related to digital twins conducted by domestic and foreign standardization organizations. Although research related to digital twins is being conducted in various industries, there were many first and second stages, which are the level of replicating and monitoring reality. Based on the general standardization underway with research on actual digital twin construction cases, it seems necessary to standardize each industry field.

사물인터넷 이해하기

윤재석(Jaeseok Yun) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.12

In this paper, we propose an well-organized lecture note for giving a better understanding on the Internet of Things (IoT) to people including non-computer majors without computing and communication knowledge. In recent years, the term ‘IoT’ has been popularized, and IoT will make a huge impact on our industries, societies, and environments. Although there are large amount of literature on presenting IoT from technological perspectives, few are published that are organized for teaching students having non-computer-related majors. Based on research and education experiences on IoT, we tried to make a lecture note focusing on the process of collecting data from everyday objects, transmitting and sharing data, and utilizing data to create new values for us. The proposed lecture note was employed in teaching a liberal arts class, and it was shown that students could have an understanding of what IoT really means and how IoT could change our world.

사물인터넷 파일럿 서비스

윤재석(Jaeseok Yun),안일엽(Il-Yeop Ahn),이상신(Sang-Shin Lee),김재호(Jaeho Kim) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.1

사물인터넷 융합을 통한 스마트 기기의 발전 동향

김재호,윤재석,이장원,Kim, Jaeho,Yun, Jaeseok,Lee, Jang-Won 한국정보통신학회 2013 한국정보통신학회지 Vol.14 No.2

Dynamic Service Composition and Development Using Heterogeneous IoT Systems

Minwoo Ryu(류민우),Jaeseok Yun(윤재석) 한국컴퓨터정보학회 2017 韓國컴퓨터情報學會論文誌 Vol.22 No.9

IoT (Internet of Things) systems are based on heterogeneous hardware systems of different types of devices interconnected each other, ranging from miniaturized and low-power wireless sensor node to cloud servers. These IoT systems composed of heterogeneous hardware utilize data sets collected from a particular set of sensors or control designated actuators when needed using open APIs created through abstraction of devices’ resources associated to service applications. However, previously existing IoT services have been usually developed based on vertical platforms, whose sharing and exchange of data is limited within each industry domain, for example, healthcare. Such problem is called ‘data silo’, and considered one of crucial issues to be solved for the success of establishing IoT ecosystems. Also, IoT services may need to dynamically organize their services according to the change of status of connected devices due to their mobility and dynamic network connectivity. We propose a way of dynamically composing IoT services under the concept of WoT (Web of Things) where heterogeneous devices across different industries are fully integrated into the Web. Our approach allows developers to create IoT services or mash them up in an efficient way using Web objects registered into multiple standardized horizontal IoT platforms where their resources are discoverable and accessible. A Web-based service composition tool is developed to evaluate the practical feasibility of our approach under real-world service development.

Detection of Moving Direction using PIR Sensors and Deep Learning Algorithm

Jiyoung Woo(우지영),Jaeseok Yun(윤재석) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.3

In this paper, we propose a method to recognize the moving direction in the indoor environment by using the sensing system equipped with passive infrared (PIR) sensors and a deep learning algorithm. A PIR sensor generates a signal that can be distinguished according to the direction of movement of the user. A sensing system with four PIR sensors deployed by 45° increments is developed and installed in the ceiling of the room. The PIR sensor signals from 6 users with 10-time experiments for 8 directions were collected. We extracted the raw data sets and performed experiments varying the number of sensors fed into the deep learning algorithm. The proposed sensing system using deep learning algorithm can recognize the users’ moving direction by 99.2 %. In addition, with only one PIR senor, the recognition accuracy reaches 98.4%.

Voice-based Device Control Using oneM2M IoT Platforms

Isu Jeong(정이수),Jaeseok Yun(윤재석) 한국컴퓨터정보학회 2019 韓國컴퓨터情報學會論文誌 Vol.24 No.3

In this paper, we present a prototype system for controlling IoT home appliances via voice-based commands. A voice command has been widely deployed as one of unobtrusive user interfaces for applications in a variety of IoT domains. However, interoperability between diverse IoT systems is limited by several dominant companies providing voice assistants like Amazon Alexa or Google Now due to their proprietary systems. A global IoT standard, oneM2M has been proposed to mitigate the lack of interoperability between IoT systems. In this paper, we deployed oneM2M-based platforms for a voice record device like a wrist band and LED control device like a home appliance. We developed all the components for recording voices and controlling IoT devices, and demonstrate the feasibility of our proposed method based on oneM2M platforms and Google STT (Speech-to-Text) API for controlling home appliances by showing a user scenario for turning the LED device on and off via voice commands.

HRV 센서와 표준 사물인터넷 플랫폼을 활용한 스트레스 측정 시스템

안은솔(Eunsol Ahn),윤재석(Jaeseok Yun) 한국컴퓨터정보학회 2019 한국컴퓨터정보학회 학술발표논문집 Vol.27 No.1

유비플로어를 이용한 사용자 인증 시스템

이승헌(Seunghun Lee),윤재석(Jaeseok Yun),류제하(Jeha Ryu),우운택(Woontack Woo) 한국정보과학회 2005 정보과학회논문지 : 소프트웨어 및 응용 Vol.32 No.4

본 논문에서는 사용자의 발걸음 정보를 이용하여 유비쿼터스 컴퓨팅 환경 중 가정과 같이 규모가 크지 않은 곳에서 사용자의 위치 추적 및 인식이 가능한 유비플로어 시스템을 제안한다. 유비쿼터스 환경에서 개인화 된 위치 기반 서비스를 제공하기 위해서는 사용자 및 위치 정보가 반드시 필요하다. 기존의 시스템은 이를 위해서 태그등의 센서를 휴대하거나 카메라등의 비접촉 센서를 사용하였다. 그러나 이들은 사용자에게 불편함을 주거나 주변 노이즈에 민감한 단점이 있다. 이를 극복하기 위해, 사용자가 걸을때의 지면 반력을 이용한 플로어-기반의 인증 시스템이 제안되었으나 시스템을 구성하는 센서와 주변 기기가 비싸다는 단점이 있다. 제안된 시스템은 싼 ON/OFF 스위치 센서들을 사용해 일상생활에서 걷는 사용자의 발걸음 패턴을 파악하여 사용자를 인증한다. 성인 남녀 10명을 대상으로 실험하여 평균 90% 의 인식률을 얻었으며, 사용자는 인증받기 위해 특별한 장치의 착용이나 특정한 행동을 취할 필요가 없다. We propose the ubiFloor system to track and recognize users in ubiquitous computing environments such as ubiHome. Conventional user identification systems require users to carry tag sensors or use camera-based sensors to be very susceptible to environmental noise. Though floor-type systems may relieve these problems, high cost of load cell and DAQ boards makes the systems expensive. We propose the transparent user identification system, ubiFloor, exploiting user's walking pattern to recognize the user with a set of simple ON/OFF switch sensors. The experimental results show that the proposed system can recognize the 10 enrolled users at the correct recognition rate of 90% without users' awareness of the system.

건물 에너지 관리 시스템을 위한 추론 엔진 설계

류민우(Min-Woo Ryu),윤재석(Jaeseok Yun),김재호(Jaeho Kim),이상신(Sang-Shin Lee) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1