https://repository.kopri.re.kr/handle/201206/15720 2026-03-05T08:33:35Z https://repository.kopri.re.kr/handle/201206/16123 Title: Extreme Cold-region Network Design and Reliable Operations Scenarios for Limited Power-based Extreme Environment Data Collection Authors: Hwang, Ari; Yum, Sun-Ho; Yoon, Dong-Jin; Park, Soo-Hyun Abstract: Today, polar regions such as the Arctic and Antarctic collect a wealth of data on climate, geology, oceanography, ecology, and more, and are utilized in a variety of studies. These data can be collected directly by researchers or transmitted via satellite communication, but there are many limitations due to the characteristics of extreme environments such as snowfall and strong winds. In this paper, we derive the requirements for building and operating network infrastructure in extreme environments, analyze the components and interfaces that meet them, and propose operational scenarios for stable data transmission. We also propose a simulation model that can calculate the traffic and data loss rates that may occur when operating a network in extreme environments, and analyze the traffic and data loss rates in each operational scenario. We propose a reliable data transmission scenario that considers network lifetime, traffic generation, and data loss rate in extreme environments.; 오늘날 북극, 남극과 같은 극한지에서는 기후, 지질, 해양, 생태 환경 등 여러 분야에서 많은 데이터를 수집하여 다양한 연구에 활용하고 있다. 이러한 데이터는 연구자가 직접 회수하거나 위성 통신을 통해 데이터 전송이 가능하지만, 강설, 강풍 등 극한 환경의 특성으로 인해 많은 제약사항이 있다. 또한 네트워크 인프라가 충분히 구축된 지역에서 데이터를 회수하는 방식보다 안정적으로 데이터를 전송받지 못한다. 따라서 본 논문에서는 극한지에서 네트워크 인프라를 구축하고 운영하기 위한 요구사항을 도출하고, 이를 충족하는 구성 개체 및 인터페이스를 분석하여 안정적인 데이터 전송을 위한 운용 시나리오를 제안한다. 또한 극한지 네트워크 운용 시 발생할 수 있는 트래픽과 데이터 유실율을 계산할 수 있는 시뮬레이션 모델을 제안하고, 이를 통해 각 운용 시나리오에서의 트래픽 및 데이터 유실율을 분석한다. 그리고 극한 환경에서의 네트워크 수명, 트래픽 발생량, 데이터 유실율을 고려한 안정적인 데이터 전송 시나리오를 제안한다. 2025-07-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16081 Title: The Development and Preliminary Operation Results of An Icequake Monitoring System Authors: Moon, Jungho; Ko, Chihye; Kim, Hyoung-Kwon Abstract: Icequakes in glaciers serve as critical indicators for understanding glacial dynamics and predicting resultant environmental changes. This paper presents the development and preliminary operation results of an icequake monitoring system capable of real-time measurement, data storage, and wireless transmission to a remote server when connectivity is available. Unlike conventional seismic equipment, the proposed battery-powered system can reliably operate for over six months without operator intervention, even in remote glacial regions. Its performance was validated through domestic tests, confirming its ability to detect seismic events. Additionally, it was deployed near Jang Bogo Station at Browning Pass, Antarctica, where it demonstrated stable operation under extreme environmental conditions.; 빙하에 발생하는 지진은 빙하의 움직임과 이로 인한 환경 변화를 예측하는 데 중요한 지표로 활용된다. 본 논문에서는 빙하 위에 설치하여 빙진을 실시간으로 측정·저장하고, 무선 통신이 가능한 경우 저장한 데이터를 원격 서버로 전송할 수 있는 빙진 모니터링 시스템의 개발과 이의 시험 운영 결과를 제시한다. 기존 지진 측정 장비는 고정식으로 설치 지역이 제한적이며 주기적인 관리가 필요하다는 단점이 있다. 이에 비해 본 시스템은 배터리로 작동하며, 사람이 접근하기 어려운 지역에서도 운영자의 관리 없이 6 개월 이상 안정적으로 운영할 수 있다. 시스템의 성능과 신뢰성을 검증하기 위해 국내에서 시험 운영을 통해 지진 감지 기능을 확인하였으며, 남극 Browning Pass 지역의 장보고 기지 근처 빙하에 설치하여 극한 환경에서도 안정적으로 작동함을 확인하였다. 2025-03-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16054 Title: Synergistic effects of ionic liquid integrated superhydrophobic composite coatings on anti-icing properties Authors: Patil, Aravind H.; Trinh, Ngoc Le; Do, Hackwon; Kang, Youngho; Lee, Joohan; Chung, Changhyun; Lee, Han-Bo-Ram Abstract: Ice accretion on surfaces presents significant challenges across various applications. To address this, hydrophobic polymer/ionic liquid (IL) composite coatings have emerged as effective solutions for enhancing anti-icing properties. In this study, we explored the potential of a poly(dimethylsiloxane) (PDMS)/IL/SiO2 nanoparticle (NP) composite, employing two synergistic strategies: superhydrophobicity to reduce the ice/coating contact area and IL-induced quasi-liquid layer (QLL) formation to improve anti-icing performance. Density functional theory (DFT) calculations and structural analyses were performed to confirm IL dispersion within PDMS matrix, highlighting ion-dipole interactions between PDMS and 1-ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide (EMIMTFSI). IL-integrated PDMS/SiO2 composite exhibited a water contact angle (WCA) and water sliding angle (WSA) of 166.6 f 0.5 degrees and 4 f 1 degrees, respectively. The PDMS/IL/SiO2 NPs composite coating exhibited an ice adhesion strength (IAS) of 19 f 1 kPa, which is four times lower than that of the PDMS/SiO2 NPs composite. Additionally, the IL-integrated superhydrophobic composite exhibited the FDT of 325 f 6 s, representing a 14-fold increase compared to that of a bare Al substrate. Overall, the IL-integrated coatings exhibited superior superhydrophobicity and QLL formation, leading to significantly improved FDT and a notable reduction in IAS. These sprayable IL-based composites show great promise as practical anti-icing coatings for extreme cold environments. 2025-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16360 Title: Airborne and Spaceborne Mapping and Analysis of the Subglacial Lake D2 in David Glacier, Terra Nova Bay, Antarctica Authors: Ju, Hyeon Tae; Kang, Seung-Goo; Han Hyangsun; Beem Lucas H.; Ng Gregory; Chan Kristian; Kim Taewook; Lee, Joohan; Lee, Jong Ik; Kim Yeadong; Pyun Sukjoon Abstract: During the 2018-2019 Antarctic summer, the Korea Polar Research Institute and the University of Texas Institute for Geophysics collaborated on a helicopter-based ice-penetrating radar (IPR) survey over the active subglacial lake D2 (SLD2), located in the midstream of the David Glacier, Terra Nova Bay, Antarctica. This study investigates the relationship between SLD2 water levels and fluctuations in glacial surface elevation (up to 3.6 m) and delineates subglacial lakes within the study area. We provide a comprehensive analysis based on integrated data from IPR (2018), Sentinel-1 double-differential interferogram synthetic aperture radar (DDInSAR) (2017-2022), ICESat-2 laser altimeter (2019-2022), and KOMPSAT-5 synthetic aperture radar (2021 and 2023). The concave bedrock structure and low hydraulic head areas concentrate subglacial meltwater, facilitating water accumulation and retention, forming a lake. The SLD2 lake complex is identified based on bed topography, hydraulic gradient, and relative bed reflection intensity. Its area is approximately 1/9.2 of the lake area estimated through remote sensing. Our analysis suggests that variations in water supply and discharge along the subglacial channel network influence lake water levels, as evidenced by a surface elevation increase of up to 3.69 m in the SLD2 area from 2019 to 2022. Additionally, the presence of crevasses and incoherence in the DDInSAR imagery suggests that these subglacial lakes impact glacier flow velocity. 2025-01-01T00:00:00Z