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도심지 터널 근접시공에 의한 기존 지하철 구조물 안정성 평가
한상민,이동혁,박두희,Han, Sangmin,Lee, Donghuk,Park, Duhee 한국터널지하공간학회 2021 한국터널지하공간학회논문집 Vol.23 No.5
As the construction of trans infrastructure using the underground tunnel have been rapidly increased, various nearby excavation of existed underground facility including subway structure has been occurred in urban tunnelling. The concern and worry relating to the safety and stability of the existed facility by nearby excavation is becoming the key issues in urban tunnelling. In this study, it was conducted for existed the subway station structure at Seoul subway line which was closely located in the new Dongbuk urban metro railway to determine the behavior characteristics of station structure according to adjacent tunnel construction. Also, it was reviewed the evaluation of the safety zone and excavation method for subway structure. And after a review of damage evaluation, track irregularities and structural calculation by using a numerical analysis, stability of the subway structure according to nearby tunnel excavation was evaluated to be secured. This study is expected to be applied as useful reference in advance if you need to review the effects of existed structure according to nearby construction in complex urban tunnelling. 도심지에서의 교통인프라 개발이 활발해 지고, 대심도 지하터널을 이용한 도시의 기반시설 확충으로 인하여 기존 운영되거나 설치된 시설물 또는 구조물 상호 간의 근접시공이 많이 이루어지고 있다. 이에 따라 근접시공으로 인한 시설물 또는 구조물에 미치는 안정성 확보여부는 중요한 이슈가 되고 있으며, 관련법에 의하여 지하터널공사에 따른 지하안전영향 평가를 반드시 수행하여야 한다. 본 연구에서는 근접시공으로 인한 정거장구조물 의 거동특성을 파악하기 위해 동북선도시철도 터널이 계획된 노선 상부의 지하철 6호선 고려대역 정거장 구조물을 대상으로 신설터널에 의한 기존 구조물에 미치는 안전영향평가를 수행하였다. 이를 위하여 정거장구조물의 안전영역 평가 및 굴착방법에 대한 검토와 3차원 수치해석을 통한 상세검토를 수행하였다. 구조물 손상도 평가, 궤도 틀림 및 기존 구조물과 건물 안정성 평가 결과 근접터널공사에 따른 기존 정거장 구조물의 안정성은 확보되는 것으로 평가되었다. 본 연구는 도심지 터널공사에서 근접시 공시 기존의 인접구조물에 미치는 영향을 사전에 검토하는 경우 기본적인 기초 참고 자료로 활용될 수 있을 것으로 기대된다.
6G 위성통신망을 위한 군집 저궤도 위성의 통신 서비스 분석
한상민(Sangmin Han),김경록(Kyeongrok Kim),신원재(Wonjae Shin),김재현(Jae-Hyun Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
5G 성능 최적화 및 6G 상용화를 목적으로 군집 저궤도 위성을 활용한 비지상 네트워크 (Non-Terrestrial Network, NTN)가 최근 학계 및 산업계 모두에서 각광받고 있다. 본 논문에서는 국내 지상국 위치에 따른 단일 궤도 군집 저궤도 위성의 통신 연결성을 분석한다. SpaceX 가 운용하고 있는 Starlink 위성의 정보가 포함된 Two-Line Element (TLE) 파일을 사용하여 10 개의 군집 저궤도 위성을 단일 궤도로 설계한다. 저궤도 위성과 지상국 간의 통신 link 는 Line-of-Sight (LoS) link 로 설정하여 국내에 배치되어 있는 지상국과 군집 저궤도 위성 간 연결성과 통신 처리량을 분석한다.
한상민(Sangmin Han),정도영(Doyoung Chung) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Mechanical vacuum pump (MVP) is a device making vacuum by getting the drive from engine. The main function of vacuum pump is to evacuate the air from the brake booster tank and create vacuum in the auxiliary tank for actuating the turbo charger waste gate actuation mechanism and EGR valve. Mechanical vacuum pump always rotates during engine running by the oldham coupling connection with engine camshaft. MVP friction torque affects engine fuel economy directly. Recently the usage of vacuum pump in the engine is increasing. According charged gasoline engine as well as charged diesel engine are increasing in number for improving engine fuel economy. In this study, the various ideas of MVP friction reduction were proposed by experimental study of MVP design factors. And optimized design factors composition was found without negative side effect using DFSS process. The selected DFSS control factors also should be more robust factors for noise and part production variation. After measuring the friction torque reduction effects of selected design, Negative side effects were investigated. Finally Improved MVP was validated with real engine dynamometer endurance test.
엔진 밸브 융착부의 잔류 응력 최적화 공법에 대한 연구
한상민(Sangmin Han),홍재웅(Jaewoong Hong),오재욱(Jaeook Oh),김현승(Hyunseung Kim),이경태(Kyoungtae Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Many gaseous fuel (LPG and CNG) engines are being developed due to economic efficiency compared with gasoline engines. Wear-resistant material development of engine valves and valve seat insert (VSI) is important for the gaseous engine development. The use of gaseous fuels often result in significant increases valve seat insert (VSI) wear and valve seat wear due to the lack of the lubricity of the fuel. The hardened materials are adapted for valve seat insert (VSI) and welded valve seat material. The heavy wear and thermal/mechanical impact can make cracks in welded valve in the last of engine endurance test. The brittleness of hardening material and residual stress made by welding are also reasons of valve cracks. Developments of valve welding material and valve seat insert material (VSI), welding quality and heat treatment process after welding are required for increased gaseous engine life. In this study, the measurement method of residual hoop stress was developed for welded valve head. The optimized control factors in post weld heat treatment are defined without any negative side effect using DFSS process. The selected control factors have to be more robust factors for noise. After finding the effects of control factors on optimized heat treatment using DFSS process, Negative side effects are investigated. Finally the improved fatigue characteristics of welded valve are validated with real engine dynamometer endurance test.
MARK-Ⅲ LNG 방열시스템의 펌프타워 및 베이스서포트 강도 평가
한상민(Han Sangmin),사티쉬쿠마(Y.V. Satish Kumar),서용석(Suh Yongsuk) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The present paper discusses the thermo-mechanical strength analysis of pump tower and pump tower base support of MARK-Ⅲ insulation system of LNG carriers. The loading condition includes the sloshing, inertial, thermal, hydrostatic, gravity loads and reaction forces, which are assessed under pessimistic conditions. A very pragmatic idealization of the insulation system is implemented in order to simulate the realistic behavior of the structures under the given loading conditions. The pump tower and pump tower base support are found to have high stresses at 10% filling ratio of the tank. The paper emphasizes the loading scenarios, idealization schemes and the behavior of insulation and pump tower systems in LNG carriers.