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중저층 공동주택의 가변성 향상에 따른 내진성능과 사업성 분석
유지성(Yu Ji-Sung),최현훈(Choi Hyun-Hoon),김진구(Kim Jin-Koo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Recent trend in apartment buildings is to reduce interior load-bearing walls to improve spatial flexibility and ease of remodeling. This study investigates the seismic performance and cost of apartment buildings as a function of spatial flexibility. According to nonlinear analysis results, shear wall type apartment buildings show superb seismic performance. Combined wall and column-slab type buildings with improved spacial flexibility can also be designed to satisfy current seismic design code. In low-rise apartment buildings wall-type structures, combined structures, and flat slab structures require similar amount of structural materials to satisfy the design loads. However as the number of story increases the structural materials, especially reinforcing steel, rapidly increase in flat-slab buildings.
기하 비선형성을 고려한 철근콘크리트모멘트골조의 연쇄붕괴 해석
김진구(Kim Jin-Koo),유지성(Yu Ji-Sung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
The objective of this study is to investigate the progressive collapse potential of reinforced concrete moment frame structures considering geometric nonlinearity. To this end 3-, 6-, and 15-story RC moment frames were designed as analysis model structures with and without considering seismic load, and their progressive collapse potentials were investigated by performing nonlinear static and dynamic analyses. It was observed from the analysis results that the catenary action is activated by the reinforcing steel and is proportional to the amount of the reinforcement. It was also observed that the amount of stirrup affects the onset of the catenary action and the progressive collapse behavior at large deformation. According to the nonlinear dynamic analysis results the structures not designed for seismic load turned out to be highly vulnerable for progressive collapse, whereas the structures designed considering seismic load showed superior performance against progressive collapse.
내진 및 연쇄붕괴 저항성능 향상을 위한 기존 구조물의 효율적인 보강방법에 관한 연구
김진구(Kim Jin-Koo),최현훈(Choi Hyun-Hoon),유지성(Yu Ji-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2
Passive energy dissipation devices (PEDD) are generally used to reduce structural responses caused by earthquake or wind loads. This study presents combined system of rotational friction damper connected to cables to enhance both seismic and progressive collapse resisting capacity of existing structures. To this end 3-, 6-, and 15-story RC moment frames were designed considering only gravity loads. Rotational friction dampers were designed according to the capacity spectrum method (CSM) to satisfy given performance objectives against seismic load. Nonlinear dynamic analysis results showed that the structures retrofitted by rotational friction dampers showed superior performance against seismic load especially in the 3-story structure. It was also observed that the retrofitted structures showed more stable behavior against progressive collapse.
중저층 공동주택의 가변성 향상에 따른 내진성능과 사업성 분석
김진구(Kim Jin-Koo),최현훈(Choi Hyun-Hoon),유지성(Yu Ji-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.1
Recent trend in apartment buildings is to reduce interior load-bearing walls to improve spatial flexibility and for ease of remodeling. This study investigates the seismic performance and cost of apartment buildings as a function of spatial flexibility. To improve spatial flexibility the length of shear walls was gradually reduced. According to nonlinear analysis results, shear wall type apartment buildings show superb seismic performance. However for low to medium-rise apartment buildings, the combined system of shear wall and flat plate with improved spacial flexibility can also be designed to satisfy current seismic design code without difficulty. In low-rise apartment buildings wall-type structures, combined structures, and flat plate structures require similar amount of structural materials to satisfy the design loads. However as the number of story increases the structural materials, especially reinforcing steel, rapidly increase in flat plate buildings.
수직자성박막에서 자구벽 속도 측정을 통한 샘플 재현성 확인 방법
문준(Joon Moon),이성협(Seong-Hyub Lee),김기태(Kitae Kim),박정현(Jung-Hyun Park),장준영(Jun-Young Chang),유지성(Ji-Sung Yu),최석봉(Sug-Bong Choe) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
In this study, a method was developed to confirm the deposition reproducibility of the magnetic layer thickness through the magnetic domain wall velocity analysis in the perpendicular magnetic thin film. We analyzed the effect of magnetic layer thickness and magnetic anisotropy on the magnetic domain wall motion occurring in a perpendicular magnetic thin film composed of Pt/Co/Pt. It was confirmed that the creep scaling constant (α) changed rapidly in the thickness regime of the magnetic layer where perpendicular magnetic anisotropy was formed. Using this, it is possible to check the change of α with respect to the change in the thickness of the magnetic layer of several A.
비외상성 성인 심폐소생술 간호업무 프로토골 개발 : 무수축 환자를 대상으로
유지성,최희강,황진향,김부자,김주원,김윤희,오현식 병원간호사회 2007 임상간호연구 Vol.13 No.1
Purpose: The purpose of this study was to develop a useful protocol for nurses participating in cardiopulmonary resuscitation (CPR) process for non-traumatic adult victims of cardiopulmonary arrest (CPA) in regional emergency center. Method: The preliminary standards of the protocol were selected by the process of referring to the known protocols for CPR nursing activity, reviewing textbooks and published papers on CPR, and analyzing the medical records of non-traumatic adult victims of CPA. The validity of protocol standards was measured with a questionnaire survey developed by experts panel, consisting of 8 emergency physicians and 22 nurses, and then the standards were revised. Throughout repeating the validating and revising process once more, the final standards were completed. The clinical effects in applying the new protocol on CPR nursing activity were analysed with comparison on time of CPR performance between with and without protocol use. Result: Thirty-one standards which showed more than 80% CVI (content validity index) were selected. With applying the new protocol, such CPR nursing activities as vasoconstrictors infusion and the confirmation of endotracheal tube depth were done (maximally 46sec, totally 152.79sec) than without it. Conclusion: New nursing protocol for CPR, developed throughout this research process would be useful for the quality of CPR in the regional emergency center. It also can could be used as an effective educational tool for nurse novice in CPR.