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내부 브레이스 보강 yLRC 합성기둥의 압축강도 및 거동에 관한 실험 연구
김명한,Kim. Myeong Han 한국방재학회 2012 한국방재학회논문집 Vol.12 No.1
y형강판과 L형강으로 기둥의 외부를 구성하고 내부에 콘크리트를 타설하여 완성하는 yLRC (Reinforced Concrete with y-shape steel sheets and L-shape steel angles) 합성기둥의 연성거동 능력을 보완하기 위하여 내부 브레이스를 설치한 실험체를 제작하였으며, 이에 대한 압축거동 실험을 수행하였다. 기존에 제안되었던 yLRC 합성기둥에 대한 축방향 압축강도 실험은 이미 수행되었으며, 최대하중 이후에 좀 더 연성적인 거동을 위한 보완이 필요하다는 의견이 제시되었다. 또한 기존 yLRC 합성기둥의 압축강도를 예측하기 위해 제안된 식의 타당성을 검토하는 과정이 필요하였다. 내부 보강 브레이스가 기둥의 전체적인 압축거동에 미치는 영향을 분석하기 위해서 브레이스의 설치유무, 브레이스의 종류 및 개수 등을 실험변수로 하는 총 6개의 실험체를 제작하고, 이 실험체에 대하여 중심축하중 실험을 수행하였다. 실험결과를 바탕으로 보강 yLRC 합성기둥의 압축강도 및 거동에 대한 역학적인 특성을 분석하고 기존 제안식의 타당성 여부를 검토하였다. Compressive strength tests on yLRC (Reinforced Concrete with y-shape steel sheets and L-shape steel angles) composite column supplemented by inner braces are performed. Although axial compressive strength tests of Non-supplemented yLRC column were performed, in the previous study, the columns showed comparatively sudden strength reduction after peak load. This study aims to verify ductile behaviors of the supplemented yLRC columns beyond the maximum load and to examine the suggested equation for calculating the compressive strength of the composite column. The experimental variables of this study are 1) the existence of inner braces, 2) the type of inner braces and 3) the number of inner braces. Total of six specimens having practical section size are fabricated for concentrically axial load test. Based on the test results, the axial behavior of the supplemented yLRC composite column are analysed and the applicability of the suggested equation is examined.
CIS태양전지 박막내 Na의 균일 첨가기술에 대한 연구
김명한 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
CuInSe2 (CIS) thin films are considered to be the most reasonable materials for high efficiency solar cells owing to their appropriate bandgap, long-term stability, and low-cost production. As the electrodeposition could produce thin films over a large area and easily be scaled up to a commercial process at a lower charge, electrodeposition is highly practical technique for developing CIS-based solar cells. It has been observed that CIS solar cells containing small amounts of Na achieve higher efficiencies compared to those without Na. The most significant effects are (a) increased hole density and film conductivity and (b) suppression of the formation of the ordered defect compound. Other more additional effects were seen such as, improved film morphology, orientation, and grain sizes, increased uniformity of photocurrent and short-circuit current, higher open circuit voltage, and higher fill factors. In the present paper, Na-doped Mo thin films were deposited on soda lime glass at room temperature in order to incorporate Na by using dc magnetron sputtering. Mo thin films were deposited on the Na-doped Mo thin films in the same procedure. CIS precursor films were electrodeposited on Mo/glass substrate in acidic solutions containing Cu2+, In3+ and Se4+ ions at -0.5V(SCE) and pH 1.8. In order to induce recrystallization, the electrodepositied Cu1.00In0.81Se2.08 precursor films were annealed under a high Se gas atmosphere for 30 min at 500℃. The results of these experiments are as follows. The sheet resistance of Mo-Na/Mo bi-layer was outstandingly lower than the back cantact of Mo. According to the increases of the thickness of Mo-Na, the sheet resistance of back contact was increased. The grain size of back contact and the amount of Na in the CIS absorber layer were also increased. In case of depositing only Mo without Na, the grain was uniformed. However, the faceted phases occurred, resulting in rough surface morphology of the CIS films
김명한,권숙인,강춘식,나달주 ( M . H . Kim,S . I . Kwun,C . S . Kang,D . J . Na ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.3
This paper presents experimental data for the computerization of green sand control. The results can be summarized as follows: 1. To obtain the proper compactability at the mixer, the addtion of moisture is far more efficient than the control of mixing time or addtion of clay. 2. The log R(% clay/% moisture) vs. log compactability curve moves upward as the amount of clay increases and moves downward as the amount of seacoal, dead bentonite or coked seacoal increases. 3. The ratio of dead to initial clay amount or coked to initial seacoal amount is changed according to sand to metal ratio, mainly, and according to pouring temperature, partly, at a shake out time of 12hrs.