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유혜란,권기혁,Yu, Hye-Ran,Kwon, Ki-Hyuk 한국건축역사학회 2012 건축역사연구 Vol.21 No.3
This study is intended to Mindori structure which is general private houses' structural type among traditional types and is a basic study to confirm structural characteristics of Hwatong connection which is general connection type of column-beam-cross beam. It is aimed to analyze how main member, column, such as size, figure, thickness of Sungetuk and Dugeup affect on structure. Following conclusions are drawn. 1. According to connection conditions, models with big coefficient of friction show stable hysteretic behavior until the angle rotation of member reaches 1/60 and models with small coefficient of friction show dramatical increase in load after the angle rotation of member reaches 1/24. After the angle rotation of member reaches 1/30, separation distance of members is identified physically and cracks are not observed. 2. Specimens with big coefficient of friction show similar inner force regardless of column size(except column size 150mm) and models with small coefficient of friction show increasing inner force as the column size increases. Specimens with same sectional area have similar inner force even though the column figures are different. The thickness of Sungetuk and Dugeup doesn't affect inner force greatly, however, when the thickness of Sungetuk is thin, it could lead to failure of structure as it breaks. 3. The bigger the size of column and the coefficient of friction are, the smaller Bending stiffness depreciation ratio is. 4. Energy Dissipation Efficiency differs from the coefficient of friction. When the coefficient of friction is big, square column shows bigger than round one and it is bigger when the thickness of Sungetuk and Dugeup is thicker. When the coefficient of friction is small, round column shows bigger than square one.
탄소섬유판 삽입공법에 의한 목재보 보강효과에 관한 연구
유혜란,정원철,최민석,권기혁,Yu. Hye-Ran,Jung. Won-Chul,Choi. Min-Seok,Kwon. Ki-Hyuk 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
In repairing and reinforcing modem architecture, altering the features must be minimized. We concluded that inserting CFRP(Carbon Fiber Reinforcement Polymer) plate method is the most appropriate reinforcing method that minimize altering the features. This study focuses on the effect of reinforcement by inserting CFRP plate in the timber beam of the modem architecture`s roof truss. We concluded that inserting CFRP plate method is highly influenced by its parent material, however, it is obvious that materials had reinforced by this method in general. We guess that this method is applicable to reinforcement in the modern architecture`s roof truss in various ways.
Ducted Marine Propeller의 점성유동 수치해석
유혜란(Hye-Ran Yu),정영래(Young-Rae Jung),박원규(Warn-Gyu Park) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
The present work solved 3D incompressible RANS equation on a rotating, non-orthogonal multi-blocked grid system to efficiently analyze ducted marine propulsor with rotor-stator interaction. To handle the interface boundary between a rotor and a stator maintaining the conservative property, the sliding multi block technique using the cubic spline interpolation and the bilinear interpolation technique were applied. To validate present code, a turbine flow having rotor-stator interaction was simulated. Time averaged pressure coefficients were compared with experiments and good agreement was obtained. After the code validation, the flowfield around a single-stage ducted marine propulsor was simulated.
전치 가이드베인을 가지는 수중 덕트 프로펠러 주위의 전산 유동 해석
유혜란(Hye-Ran Yu),정영래(Young-Rae Jung),박원규(Wam-Gyu Park) 한국전산유체공학회 2004 한국전산유체공학회지 Vol.9 No.2
The present work solved 3D incompressible RANS equations on a rotating, multi-blocked grid system to efficiently analyze ducted marine propulsor with the interaction of propeller guidevane and annular duct. To handle the interface boundary between the guidevane and the propeller, a sliding multiblock technique based on the cubic spline interpolation was applied. To validate the present code, a turbine flow was simulated and the time-averaged pressure coefficients were compared with experiment. After the code validation, the flowfield around a ducted marine propeller with pre-swirl guidevane was simulated.
근대 건축물에 사용된 서양식 목조 지붕 트러스의 구조요인 및 기타 영향요인에 관한 연구 - 공공기관이 관리하는 문화재 중 근대건축물 기록을 중심으로 -
이윤희,유혜란,권기혁,Lee, Yoon-Hee,Yu, Hye-Ran,Kwon, Ki-Hyuk 한국건축역사학회 2011 건축역사연구 Vol.20 No.4
Western style timber roof trusses used as typical roof structures of buildings during a modern period have been developed with the interactions with their facade and functionality. The shapes of trusses and member sizes have been diversely changed by the purposes of architects, historical circumstances, and structural characteristics. For this reason, the change in the shapes of western style timber trusses along the times is one of important technology assets demonstrating the development of their structures during the modern period. Therefore, the purpose of this paper is to find out their structural characteristics throughout parametric analysis of which parameters were determined from the collected and classified documents on western style timber roof structure built in the modern period carefully obtained from public institutions. Results of the parametric analysis are as follows. The number of king-post trusses and modified king-post trusses built between 1920 and 1937 reaches almost half of the total number of truss types investigated. The mean values of their spans, distances, tributary areas, and height are respectively, 10.5m, 2.4m, $24.37m^2$and 3.24m. The cross-section areas of trusses tend to reduce since the city construction law was enacted in 1920. Also, this study found that western architects usually used larger structural members than eastern architects and usages and finishing materials of roof trusses are not always considered as one of the important design parameters.
탄소섬유판 삽입공법으로 보강된 목재보 휨강도에 관한 연구
권기혁,유혜란,이진혁,최민석,Kwon. Ki-Hyuk,Yu. Hye-Ran,Lee. Jin-Hyuk,Choi. Min-Seok 한국방재학회 2008 한국방재학회논문집 Vol.8 No.1
문화재의 보수 보강은 모재 및 외형의 손상을 최소화하면서 부재의 강도를 증가시킬 수 있어야 한다. 목조 문화재에서 보부재에 대한 기존의 여러 보강법 중 CFRP 삽입공법은 모재의 손상을 최소화하면서 원목재의 강도를 효과적으로 증가시킬 수 있어 향후 근대건축물의 보수보강 공사에 적용성이 높은 방법이 될 수 있을 것이다. 따라서 본 연구에서는 근대건축물의 지붕구조체를 보존하기 위한 보부재의 보강방법 중 부재의 외연적 손상을 최소화할 수 있는 탄소판 삽입공법을 목재보에 적용하여 보강효과와 파괴 성상 등을 실험을 통해 조사, 분석하고 이 보강법의 실제 적용을 위해 보의 휨응력 산정을 위한 기초적 자료를 제시하였다. 본 실험에서는 CFRP의 배열형태와 보강량을 주요변수로 하였으며, <TEX>$0.3{\sim}0.7%$</TEX>의 CFRP보강량을 사용하였을 경우 원목재의 강도에 비해 최대 173%까지 보강효과를 발휘하는 것으로 나타났으나, 옹이 등 모재의 특성에 의하여 크게 영향을 받는 것으로 관찰되었다. 향후 이 공법의 적용성을 높이기 위해 목재에 대한 기초적 연구들이 활성화되어야 할 것이며, 목재의 비파괴 실험에 관한 연구도 필요할 것으로 사료된다. When historical or cultural buildings need to be repaired or reinforced, the changes of original features should be minimized, and the strengths of structures should be improved. Among the existing methods to reinforce historical wood structures, the carbon fiber reinforcement polymer (CFRP) installation method is one of the best ones to achieve the afore-mentioned requirements. Therefore, this study aims at investigating the reinforcing effects and failure modes of timber beams reinforced with the inserted CFRP, a part of roof trusses in modern wood structures, and at providing the fundamental test data to estimate the CFRP rein-forced timber beam in the application of this reinforcing method. The primary parameters in this study were the layout and amount of CFRP. It was observed that, when <TEX>$0.3{\sim}0.7%$</TEX> of CFRP were installed, the strengths of reinforced timber beams increased up to 173% compared to its original strength, but their strengthening effects were heavily influenced by the characteristics of timber such as burls. In order to improve the applicability of this strengthening method, fundamental understandings on the characteristics of wood would be necessary, and there would be in need of researches on the non-destructive test for wood structures as well.
권기혁,황완선,유혜란,Kwon. Ki-Hyuk,Hwang. Wan-Seon,Yu. Hye-Ran 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
In Korean Building Code 2005(KBC-2005), the Seismic Zone Factor is regulated by separating the seismic zone into two part. This seismic zone factor is not matched to regional seismic characteristics of our country because the factor is based on International Building Code 2000 (IBC-2000) of USA. This study inquiry for having a sufficient grasp of the seismic characteristics of south Korea region and appling for the seismic cope plan. We have collected and analyzed earthquake record happened in domestic region. There are two kinds of earthquake record. One is Historical earthquake data, another is Instrumental earthquake data. I used Instrumental earthquake record data which reliance is higher than historical earthquake data for proposing attenuation formulas by analyzing a correlation the epicenter and the distance.