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프리캐스트 콘크리트 모듈러 보 시스템의 휨 성능에 대한 실험적 연구
노경민,조창근,이영학,Ro, Kyong Min,Cho, Chang Geun,Lee, Young Hak 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.3
Precast concrete (PC) modules have been increased its use in modular buildings due to their better seismic performance than steel modules. The main issue of the PC module is to ensure structural performance with appropriate connection methods. This study proposed a PC modular beam system for simple construction and improved structural and splicing performance. This modular system consisted of modules with steel plates inserted, and it is easy to construct by bolted connection. The steel plates play the role of tensile rebar and stirrup, which has the advantage of structural performance. The structural performance of the proposed PC modular beam system was evaluated by flexural test on one reinforced concrete (RC) beam specimen consisting of a monolithic, and two PC specimens with the proposed PC modular beam system. The results demonstrated that the proposed PC modular beam system achieved approximately 86% of the structural performance compared to the RC monolithic specimen, with similar ductility of approximately 1.06 fold greater.
노경민,김민숙,이영학,Ro, Kyong Min,Kim, Min Sook,Lee, Young Hak 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4
As an alternative to coupling beam in shear wall system, application of the damper which can dissipate energy is increasing. In this study, lintel beam type steel damper which is simple to construct and change depending on design load was proposed. Cyclic loading test was conducted to compare reinforced concrete coupling beam and lintel beam type steel damper. The test results showed that lintel beam type steel damper has higher initial stiffness and energy dissipation capacity than reinforced concrete coupling beam.
승강기 검사주기 조정을 위한안전품질 등급제 핵심항목 선정 및 중요도 평가
노경민,한관희 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.4
Recently, elevator inspection and self-examination were strengthened through the revision of the Elevator Safety Management Act, but there have been no significant reduction in serious accidents and major failures. Therefore, the government intends to lay the foundation for reflecting the safety quality rating system, which adjusts the elevator inspection cycle, as a policy to induce safety management of preemptive and active management entities. This study systematically reviewed and classified the safety quality rating system for elevator inspection cycle adjustment in previous studies, collected expert opinions, and re- constructed the key items into realistic evaluation items, and evaluated and scored the relative importance of each factor through the AHP technique.
Geostationary Orbit Surveillance Using the Unscented Kalman Filter and the Analytical Orbit Model
노경민,박은서,최병규 한국우주과학회 2011 Journal of Astronomy and Space Sciences Vol.28 No.3
A strategy for geostationary orbit (or geostationary earth orbit [GEO]) surveillance based on optical angular observations is presented in this study. For the dynamic model, precise analytical orbit model developed by Lee et al. (1997) is used to improve computation performance and the unscented Kalman filer (UKF) is applied as a real-time filtering method. The UKF is known to perform well under highly nonlinear conditions such as surveillance in this study. The strategy that combines the analytical orbit propagation model and the UKF is tested for various conditions like different level of initial error and different level of measurement noise. The dependencies on observation interval and number of ground station are also tested. The test results shows that the GEO orbit determination based on the UKF and the analytical orbit model can be applied to GEO orbit tracking and surveillance effectively.
GNSS 실시간 서비스를 위한 파일럿 프로젝트 동향 조사
노경민,조정호,조성기 한국우주과학회 2010 한국우주과학회보 Vol.19 No.1
이 연구는 국제항법서비스(IGS)에서 진행 중인 실시간 IGS 산출물 서비스 구축을 위한 실시간 파일럿 프로젝트(Real-Time Pilot Project; RTPP)의 진행 현황의 파악을 위한 것이다. 본 동향조사에서는 RTPP의 구성요소 별 진행현황과 현재 기술 수준 및 해결해야 할 이슈 등에 대해 분석하였다. 조사결과 현재 4개의 분석센터의 실시간 산출물이 예비 서비스를 하고 있으며, 이를 활용한 연구도 활발히 진행되고 있는 현황이다. 하지만, 실시간 자료 전송을 위한 자료형식과 전송방식의 표준이 정해지지 않았고, 이온층과 대류층 정보의 경우도 아직 논의가 진행 중이다. IGS가 목표로 하는 실시간 서비스는 고정밀 위치결정, 우주환경, 자연재해 감시, 기상 및 기후 연구 등의 분야에 매우 활용도가 높은 서비스로 본 동향 조사를 통해 이를 활용하기 위한 관련 연구와 기술 개발에 있어 참고자료가 될 것으로 기대된다.
DGPS기반 GRACE의 상대궤도결정과 Equatorial Spread F의 영향
노경민,Hermann Luehr,박상영,조정호 한국우주과학회 2009 Journal of Astronomy and Space Sciences Vol.26 No.4
In this paper, relative orbit of Low Earth Orbit satellites is determined using only GPS measurements and the effects of Equatorial Spread-F (ESF), that is one of biggest ionospheric irregularities, are investigated. First, relative orbit determiation process is constructed based on doubly differenced GPS observations. In order to see orbit determination performance, relative orbit of two GRACE satellites is estimated for one month in 2004 when no ESF is observed. The root mean square of the achieved baselines compared with that from K-Band Ranger sensor is about 2 » 3 mm and average of 95% of ambiguities are resolved. Based on this performance, the relative orbit is estimated for two weeks of two difference years, 2003 when there are lots of ESF occurred, and 2004 when only few ESF occurred. For 2003, the averaged baseline error over two weeks is about 15 mm. That is about 4 times larger than the case of 2004 (3.6 mm). Ionospheric status achieved from K-Band Ranging sensor also shows that more Equatorial Spread-F occurred at 2003 than 2004. Investigation on raw observations and screening process revealed that the ionospheric irregualarities caused by Equatorial Spread-F gave significant effects on GPS signal like signal loss or enhancement ionospheric error, From this study, relative orbit determination using GPS observations should consider the effect of Equatorial Spread-F and adjust orbit determination strategy, especially at the time of solar maximum.