광학 및 레이다를 이용한 저궤도인공위성 추적 및 감시 시스템의 타당성 연구

노경민,윤재철,박은서,최규홍 한국우주과학회 2000 한국우주과학회보 Vol.9 No.2

Numerical Solution of Minimum-Time Reorientation Maneuver of Three-Axis Stabilized Satellite using Magnetic Torquer

노경민,최규홍,박상영,이상욱 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-

인방형 강재댐퍼의 구조성능에 대한 실험적 연구

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.

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.

태양활동을 고려한 태양간섭현상 연구와 무궁화 위성에의 응용

노경민,최규홍,배석희 한국우주과학회 1999 Journal of Astronomy and Space Sciences Vol.16 No.1

CT Analysis of Retropharyngeal Abnormality in Kawasaki Disease

노경민,이선화,유정현 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.6

Objective: To retrospectively compare the imaging characteristics of retropharyngeal density and associated findings for Kawasaki disease with those for non-Kawasaki disease, and identify the distinguishing features which aid the CT diagnosis of Kawasaki disease with retropharyngeal low density. Materials and Methods: Among the enhanced neck CT performed in children less than 8-years old with clinical presentation of fever and cervical lymphadenopathy over a 6-year period, only cases with retropharyngeal low density (RLD) were included in this study. The 56 cases of RLD were divided into two groups; group A included cases diagnosed as Kawasaki disease (n = 34) and group B included cases diagnosed as non-Kawasaki disease (n = 22). We evaluated the CT features including the thickness of RLD and its extent into the deep neck spaces, as well as soft tissue change in the adjacent structure. We also scored the extent of RLD into the deep neck spaces and the soft tissue changes in the adjacent structure. Results: The thickness of RLD was greater in group A than in group B (group A, 6.0 ± 2.1; group B, 4.6 ± 1.5, p = 0.01). The score of the RLD extent into the deep neck spaces was significantly greater in group A than in group B (group A, 2.3 ± 1.3; group B, 0.8 ± 1.0, p < 0.01). Also, the score of the adjacent soft tissue changes was greater in group A than in group B (group A, 2.0 ± 1.1; group B, 1.0 ± 1.0, p < 0.01). Conclusion: If children present with fever and cervical lymphadenopathy that display retropharyngeal low density with extension into more deep neck spaces as well as changes in more adjacent soft tissue, the possibility of Kawasaki disease should be considered. Objective: To retrospectively compare the imaging characteristics of retropharyngeal density and associated findings for Kawasaki disease with those for non-Kawasaki disease, and identify the distinguishing features which aid the CT diagnosis of Kawasaki disease with retropharyngeal low density. Materials and Methods: Among the enhanced neck CT performed in children less than 8-years old with clinical presentation of fever and cervical lymphadenopathy over a 6-year period, only cases with retropharyngeal low density (RLD) were included in this study. The 56 cases of RLD were divided into two groups; group A included cases diagnosed as Kawasaki disease (n = 34) and group B included cases diagnosed as non-Kawasaki disease (n = 22). We evaluated the CT features including the thickness of RLD and its extent into the deep neck spaces, as well as soft tissue change in the adjacent structure. We also scored the extent of RLD into the deep neck spaces and the soft tissue changes in the adjacent structure. Results: The thickness of RLD was greater in group A than in group B (group A, 6.0 ± 2.1; group B, 4.6 ± 1.5, p = 0.01). The score of the RLD extent into the deep neck spaces was significantly greater in group A than in group B (group A, 2.3 ± 1.3; group B, 0.8 ± 1.0, p < 0.01). Also, the score of the adjacent soft tissue changes was greater in group A than in group B (group A, 2.0 ± 1.1; group B, 1.0 ± 1.0, p < 0.01). Conclusion: If children present with fever and cervical lymphadenopathy that display retropharyngeal low density with extension into more deep neck spaces as well as changes in more adjacent soft tissue, the possibility of Kawasaki disease should be considered.

The Effects of the IERS Conventions (2010) on High Precision Orbit Propagation

노경민,최병규 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.1

The Earth is not perfectly spherical and its rotational axis is not fixed in space, and these geophysical and kinematicirregularities work as dominant perturbations in satellite orbit propagation. The International Earth Rotation Service (IERS)provides the Conventions as guidelines for using the Earth’s model and the reference time and coordinate systems definedby the International Astronomical Union (IAU). These guidelines are directly applied to model orbital dynamics of Earthsatellites. In the present work, the effects of the latest conventions released in 2010 on orbit propagation are investigated bycomparison with cases of applying the previous guidelines, IERS Conventions (2003). All seven major updates are tested, i.e.,for the models of the precession/nutation, the geopotential, the ocean tides, the ocean pole tides, the free core nutation, thepolar motion, and the solar system ephemeris. The resultant position differences for one week of orbit propagation rangefrom tens of meters for the geopotential model change from EGM96 to EGM2008 to a few mm for the precession/nutationmodel change from IAU2000 to IAU2006. The along-track differences vary secularly while the cross-track components showperiodic variation. However, the radial-track position differences are very small compared with the other components inall cases. These phenomena reflect the variation of the ascending node and the argument of latitude. The reason is that thechanged models tested in the current study can be regarded as small fluctuations of the geopotential model from the pointof view of orbital dynamics. The ascending node and the argument of latitude are more sensitive to the geopotential than theother elements. This study contributes to understanding of the relation between the Earth’s geophysical properties and orbitalmotion of satellites as well as satellite-based observations.

내 마음에 꽃이 핀다 외 1편

노경민 고요아침 2016 한국동시조 Vol.- No.1

철도의 형성과 발전을 중심으로 본 심양의 근대도시 발전과정에 관한 연구(1898~1945)

노경민,Lho, Kyung-Min 한국건축역사학회 2016 건축역사연구 Vol.25 No.2

Shenyang was one of the representative transportation hub of Northeast China during the modern period. The formation and development of the railway network gave great influence on Shenyang's city development. In order to understand the relationship between railway and city development, first, we classified Shenyang's city development period by the railway network's formation and expansion process. Then, we analyzed the relationship between railway and city space by five categories. The results of this study are as follows. First, before railway was constructed, Shenyang was a castle city, which also was the economic center of Northeast China. This was the main reason Shenyang was chosen as a railway zone. During the modern period, the castle structure became an obstacle to city transportation and environment, therefore, it was disposed. During the period of railways' expansion, South Manchuria, Jingfeng and Shenhai railway line was constructed in Shenyang. Since each line had different operation organizations, city sites along the railways were planned separately. However, these operation organizations had one common purpose, which was to use railway as an accelerator for economic development. During the period of railway's military usage, railway was reorganized as military supply transport for the Japanese, which also was used as a tool for the expansion of colonialism. Second, after Shenyang's city space was reconstructed along the railway, it created a close connection with city structure, city facilities, landscape and city transportation system. Hence, the railway system played a key role in modern city planning.

The Study of Korea National Firefighters’ Physical Fitness over 6-year Period (2011~2016)

노경민,송욱,박세영,이충근,이한준,박정준,서동일,강현주,안연순 한국체육학회 2018 International journal of human movement science Vol.12 No.2

The purpose of this study is to examine the changes of the physical fitness of firefighters from 2011 to 2016 on each gender. The data of the six physical fitness tests (grip strength, back strength, sit and reach, standing long-jump, sit-up, and shuttle-run) were analyzed by using ANOVA and multiple regression analysis. The results were statistically significant improvements in all physical fitness tests from past to recent (p <0.001). The back strength was not only the steepest improvement rate by the year (B = 6.114, p <0.001) but also the difference of the absolute value between gender. The interaction was the greatest (B = 80.276, p <0.001 and B =.668, p <0.001) in back strength. Sit and reach was the slowest rate of growth (B = .668, p <0.001) and was only fitness test that female firefighters’ was superior to male firefighters (B = .173, p <0.001). Both firefighters improved their Shuttle-run (p <0.001). Although all fitness level was increased, the female firefighters might have more effort to improve their physical fitness to perform firefighting tasks.