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외부환경 변화에 따른 단열소재 이용 시멘트 압출패널의 특성 검토
오동욱,이건철,조병영,Oh, Dong-Uk,Lee, Gun-Cheol,Cho, Byoung-Young 대한건축학회 2012 대한건축학회논문집 Vol.28 No.5
The purpose of this study was to analyze the weatherproof for insulation, warpage and unification characteristics of extrusion cement panel(ECP) according to the variation of external environment. Result to analyze mechanical properties of ECP in a preparatory experiment decided 50% about replacement ratio of insulation materials for fine aggregate as optimum mix of ECP. The weatherproof of ECP using 50% insulation materials were as follows; In insulation characteristics, the thermal conductivity after freezing and thawing test was higher than that after change of temperature and humidity. In warpage characteristics, bending strength and deflection were examined. V and PL with low density had low bending strength after freezing and thawing. The deflection of PL in bowing test was higher than another because hollow bead as insulation materials. Finally, unification characteristics of ECP followed from high quality as low length variations and good bond strength.
산업부산물을 이용한 유무기 복합 자전거 도로 포장재의 기초적 특성
오동욱,이건철,김영근,조정기,김나영,Oh, Dong-Uk,Lee, Gun-Cheol,Kim, Young-Geun,Cho, Chung-Ki,Kim, Na-Young 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.3
본 연구에서는 산업부산물로서 고로슬래그 미분말을 이용하는 유무기 복합 자전거 도로 포장재의 개발을 목적으로 바인더 대비 아크릴 수지의 최적 배합 및 고로슬래그 미분말의 최적 치환량 검토에 대한 기초적 특성을 살펴보았다. 실험결과, 아크릴 수지의 비율이 증가할수록 응결시간은 지연되어 플로는 증가하고 재료분리가 발생하며, 강도는 감소하고, 길이변화율은 증가하는 경향이 나타났다. 아크릴 수지의 최적 배합은 작업성을 유지하면서 높은 강도를 발현한 아크릴 수지가 40%인 배합이 최적인 것으로 판단된다. 또한 고로슬래그 미분말은 치환량이 증가할수록 응결시간이 지연됨에 따라 재료분리가 일어나 아크릴 수지와 바인더가 분리되고, 강도가 저하되는 경향이 나타났다. 고로 슬래그 미분말의 치환량이 40% 이하에서 목표 물성을 만족하였다. In this study, in order to develop organic-inorganic hybrid packaging materials(PM) of bike paths using blast furnace slag(BS) as industrial by-products, fundamental properties of organic-inorganic hybrid packaging materials were performed. Test result, the increase of Acryl emulsion polymer(AEP)/binder(B) ratios tends to delay the setting time, to increase the table flow, to decrease the strength by material segregation and to increase the length change. The optimal mix proportion of AEP decides on 40%(AEP/B) due to workability and high strength. The increase of BS replacement ratios also tends to delay the setting time, to separate AEP from B and to decrease the strength by material segregation. When BS replacement ratios were lower than 40%, they are satisfied with goal properties.
실내모형시험을 통한 사질토 지반에서 군말뚝과 터널의 수직 이격거리에 따른 하중분포 및 지반거동 분석
오동욱,이용주,Oh, Dong-Wook,Lee, Yong-Joo 한국터널지하공간학회 2017 한국터널지하공간학회논문집 Vol.19 No.3
도심지에서의 터널굴착은 상부구조물과의 상호거동에 대한 이해가 필수적이다. 도심지에 사용중인 대부분의 구조물은 말뚝기초로 상부의 하중을 지지하고 있어, 터널 굴착 시 반드시 영향을 받는다. 따라서 본 연구에서는 실내모형시험을 통해 기존의 군말뚝 기초 하부 터널굴착에 따른 축력 분포와 지반의 거동을 분석하였다. 말뚝 기초는 2, 3 열 말뚝으로 가정되었으며, 말뚝 선단부와 터널 천단부의 이격거리는 터널직경에 대한 일반화를 위해 터널 직경(D) 대비 0.5D, 1.0D 그리고 1.5D로 고려되었다. 지반은 약 30%의 상대밀도(Dr)를 가지는 느슨한 사질토로 형성되었으며, 말뚝의 축력 분포를 측정하기 위해 말뚝에 변형률게이지(strain gauge)를 부착하였다. 또한, 이격거리에 따른 군말뚝의 침하와 인접지반의 침하를 변위센서(linear variable differential transformer; LVDT)와 다이얼게이지(dial gauge)를 통해 측정였으며, 터널굴착에 따른 지중의 변형을 근거리사진계측기법(close range photogrammetric technique)을 통해 측정하였다. 수치 해석을 통해 실내모형시험 및 근거리사진계측 결과와 비교 분석하였다. 본 연구에서는 체적손실율(volume loss; $V_L$) 개념을 이용하여 터널굴착을 모사하였으며, 1.5%로 적용되었다. 연구결과, 이격거리가 멀어질수록 말뚝의 축력감소는 작게 나타났으며, 침하량은 모두 유사한 경향을 나타내었다. 특히, 말뚝 선단부와 터널 천단부의 이격거리가 0.5D에서 1.0D로 증가할 때 축력과 침하량의 가장 큰 감소율이 가장 큰 것으로 나타났다. Tunnelling in urban areas, it is essential to understand existing structure-tunnel interactive behavior. Serviced structures in the city are supported by pile foundation, since they are certainly effected due to tunnelling. In this research, thus, pile load distribution and ground behavior due to tunnelling below grouped pile were investigated using laboratory model test. Grouped pile foundations were considered as 2, 3 row pile and offsets (between pile tip and tunnel crown: 0.5D, 1.0D and 1.5D for generalization to tunnel diameter, D means tunnel diameter). Soil in the tank for laboratory model test was formed by loose sand (relative density: Dr = 30%) and strain gauges were attached to the pile inner shaft to estimate distribution of axial force. Also, settlements of grouped pile and adjacent ground surface depending on the offsets were measured by LVDT and dial gauge, respectively. Tunnelling-induced deformation of underground was measured by close range photogrammetric technique. Numerical analysis was conducted to analyze and compare with results from laboratory model test and close range photogrammetry. For expression of tunnel excavation, the concept of volume loss was applied in this study, it was 1.5%. As a result from this study, far offset, the smaller reduction of pile axial load and was appeared trend of settlement was similar among them. Particulary, ratio of pile load and settlement reduction were larger when the offset is from 0.5D to 1.0D than from 1.0D to 1.5D.
수직 벤투리관 내부 유동 가시화 및 고속 차압 측정에 관한 실험적 연구
오동욱(Dong-Wook Oh),배재현(Jae Hyun Bae),박장민(Jang Min Park),이정호(Jungho Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Vertical Venturi tube is widely utilized in flow rate and gas volume fraction (GVF) measurement of 2-phase flow. Fast traveling gaseous slugs act as source of pressure fluctuation and distract the differential pressure reading of the Venturi tube. In this paper, flow dynamics of travelling air slug inside a transparent Venturi tube is analyzed through high speed flow visualization system coupled with differential pressure sensor. This investigation is believed to result in better understanding of the flow rate and gas volume fraction measurement of two-phase flow which is frequently encountered in multiphase flow for flow assurance on offshore oil and gas plant.
오동욱(Dong-Wook Oh),남기언(Ki Ean Nam),송찬호(Chan Ho Song),윤석호(Seok Ho Yoon),이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In this paper, heat transfer and pressure drop characteristic of plate-fin heat exchangers for evaporative cooling system is investigated. Thermal performance and pressure drop of heat exchangers with different louver fin pitches are compared. Experiments are conducted for heat exchangers with different louver fins at the average air flow velocity of 3 m/s . 5.5 m/s. The thermal performance data are analyzed by using the effectiveness-NTU method. Pressure drop and overall heat transfer coefficient are measured as a constant temperature condition is given to the heat exchanger unit.