Deployment Support for Sensor Networks in Indoor Climate Monitoring

Yun, Jaeseok,Kim, Jaeho SAGE Publications 2013 International journal of distributed sensor networ Vol.2013 No.-

Visualization of Upper Air Data from Radiosonde Stations using Google Earth API

Jaeseok Yun,Min-Woo Ryu,Sang-Shin Lee 한국산학기술학회 2013 SmartCR Vol.3 No.6

Upper air data is meteorological data measured from weather balloons or aircraft over a particular location. This data has been used to create graphical plots such as Skew-T log-P diagrams for climate analysis and weather forecasting based on various numerical models. Upper air data is generally measured with an upper air sounding system, a radiosonde, consisting of multiple sensors for measuring meteorological conditions and a radio frequency transmitter for transmitting measured signals to radiosonde stations. In this paper, we present the visualization of upper air data collected from radiosonde stations using the Google Earth API. We first survey the literature on upper air data archives and visualizations. In particular, we summarize how to access and read the upper air dataset archived in the Integrated Global Radiosonde Archive provided by the National Climatic Data Center of the National Oceanic and Atmospheric Administration. We also demonstrate the web-based graphical tools provided by the Integrated Global Radiosonde Archive: time-series plots, sounding plots, wind plots, and temperature plots. In order to implement the visualization of upper air data collected from radiosonde stations, we investigate Google Earth API objects and functions, which can be used to build a JavaScript web page with Google Earth embedded. We propose and implement an algorithm which allows us to obtain an optimal view for a given set of radiosonde stations and demonstrate the web pages we implemented using the Google Earth API.

The User Identification System Using Walking Pattern over the ubiFloor

Jaeseok Yun,Seung-Hun Lee,Woon-Tack Woo,Je-Ha Ryu 제어로봇시스템학회 2003 제어로봇시스템학회 국제학술대회 논문집 Vol.2003 No.10

A device software platform for consumer electronics based on the internet of things

Jaeseok Yun,Il-Yeop Ahn,Nak-Myung Sung,Jaeho Kim IEEE 2015 IEEE transactions on consumer electronics Vol.61 No.4

<P>The highly-fragmented and non-standardized landscape of the Internet of Things industry results in forcing both IoT developers and end-users to have to choose their proprietary consumer electronics by a company, eventually becoming a barrier to build an unfragmented IoT ecosystem. This paper proposes an oneM2M standards-compliant device software platform for consumer electronics based on the Internet of Things, called &Cube. It leverages a standardized resource model and REST APIs to work with oneM2M service platforms, leading to interoperability across various IoT consumer electronics built on the &Cube. The growing adoption of the &Cube in consumer electronics will help lower the barriers for the manufacturers and developers to create innovative products and entirely new services.</P>

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

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.

정규화 된 상대좌표와 수용 필드 확장을 활용한 법선 벡터 추정 방법

류재석(Jaeseok Ryu),신민우(Minwoo Shin),김도훈(Dohoon Kim),윤상우(Sangwoo Yun),백준기(Joonki Paik) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

In this paper, we present a novel approach for accurate normal vector estimation in point clouds using normalized relative coordinates. Existing point cloud normal estimation methods suffer from inaccuracies caused by non-uniform point distributions, noise, and varying densities. Point cloud normal Estimation is important for 3D reconstruction and 3D data understanding. The proposed method utilizes scaling and aggregation techniques to solve the problem of weighted surface approximation in non-uniform areas. Experimental results demonstrate that the proposed method outperforms existing methods in areas without noise or with dissimilar densities.

Unconventional Terahertz Carrier Relaxation in Graphene Oxide: Observation of Enhanced Auger Recombination Due to Defect Saturation

Kim, Jaeseok,Oh, Juyeong,In, Chihun,Lee, Yun-Shik,Norris, Theodore B.,Jun, Seong Chan,Choi, Hyunyong American Chemical Society 2014 ACS NANO Vol.8 No.3

<P>Photoexcited carrier relaxation is a recurring topic in understanding the transient conductivity dynamics of graphene-based devices. For atomically thin graphene oxide (GO), a simple free-carrier Drude response is expected to govern the terahertz (THz) conductivity dynamicssame dynamics observed in conventional CVD-grown graphene. However, to date, no experimental testimony has been provided on the origin of photoinduced conductivity increase in GO. Here, using ultrafast THz spectroscopy, we show that the photoexcited carrier relaxation in GO exhibits a peculiar non-Drude behavior. Unlike graphene, the THz dynamics of GO show percolation behaviors: as the annealing temperature increases, transient THz conductivity rapidly increases and the associated carrier relaxation changes from mono- to biexponential decay. After saturating the recombination decay through defect trapping, a new ultrafast decay channel characterized by multiparticle Auger scattering is observed whose threshold pump fluence is found to be 50 μJ/cm<SUP>2</SUP>. The increased conductivity is rapidly suppressed within 1 ps due to the Auger recombination, and non-Drude THz absorptions are subsequently emerged as a result of the defect-trapped high-frequency oscillators.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-3/nn406066f/production/images/medium/nn-2013-06066f_0006.eps'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn406066f'>ACS Electronic Supporting Info</A></P>

Standard-based IoT platforms interworking: implementation, experiences, and lessons learned

Jaeho Kim,Jaeseok Yun,Sung-Chan Choi,Seed, Dale N.,Guang Lu,Bauer, Martin,Al-Hezmi, Adel,Campowsky, Konrad,Jaeseung Song Institute of Electrical and Electronics Engineers 2016 IEEE communications magazine Vol.54 No.7

<P>The Internet-of-Things (IoT) provides a great opportunity to many vertical industries because IoT interconnects various devices such as sensors and actuators and collects/processes data from them in order to improve services and reduce costs. As there exists many IoT technologies in the market, global standards and interworking mechanisms are critical to the success of the IoT. This article introduces standardized interworking interfaces and procedures based on oneM2M global standards, and tests them through use cases involving multiple IoT service platforms. The interworking involves smart city applications/services running on multiple IoT service layer platforms interoperating with each other. The main purpose of the interworking experiment is to show how machine-to-machine (M2M)/IoT service providers are using oneM2M compliant service layer platforms to deliver services more efficiently across multiple technology domains such as smart city. Because the deployment configurations of this interworking experiment span multiple domains, and the IoT devices and platforms are from different companies, we believe that this interworking experiment clearly proves that global IoT standards specifications can foster implementations of a service layer that enables services and interoperability between devices/device networks and cloud-based applications.</P>