• Title/Summary/Keyword: 건물률

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A Numerical Study to Estimate the Lateral Responses of Steel Moment Frames Using Strain Data (변형률 데이터를 이용한 철골모멘트골조의 횡응답 예측을 위한 해석적 연구)

  • Kim, Si-Jun;Choi, Se-Woon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.6
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    • pp.113-119
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    • 2016
  • In this study, the method to predict the lateral response by using strain data is presented on the steel moment frame. For this, the reliability of the proposed method by applying the example of five-story frame structure were verified. Using the strain value of columns, it predicted the lateral response of structure. It is assumed that all of four strain sensors for one column set up and the strain responses of both end of the column are utilized. The lateral response of member is calculated by using the slope deflection method. Also, using the acceleration response of the one layer, the stiffness of the rotation spring located in the supporting point is predicted. As a result, it was effective to understand the lateral displacement and acceleration responses and to predict local damage and location.

저탄소 녹색성장 - 부문별.업종별.연도별 온실가스 감축목표 확정

  • 대한설비건설협회
    • 월간 기계설비
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    • s.253
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    • pp.40-42
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    • 2011
  • 우리나라 전체 온실가스 배출량을 2020년까지 배출 전망치(BAU) 대비 30% 줄이기로 한 것에 맞춰 각 부문과 업종이 분담해야 할 감축 목표량이 정해 졌다. 수송 부문이 34.3%로 감축률이 가장 높고 다음은 건물 26.9%, 발전 26.7%, 공공 기타 25% 순이다. 관심을 끌었던 산업 부문 온실가스 배출량 감축률은 18.2%로 정해졌다. 폐기물은 12.3%이고, 농림어업은 상대적으로 부담이 덜하도록 5.2% 감축률을 배정받았다. 정부는 이같은 내용의 '부문별 업종별 연도별 국가 온실가스 감축목표'를 지난 7월 12일 국무회의에서 확정했다.

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Transmissibility Effect Evaluation of Buildings Near Railroad Areas (철도인접지역 건물에 대한 진동전달율의 영향성 평가)

  • Kim, Ji-Hyeon;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
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    • v.11 no.1
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    • pp.131-138
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    • 2011
  • For train vibration influence assessment of newly constructed buildings in building design levels, 4 train measured vibration acceleration responses were used to compare with TR theory values and suitability of TR values was proposed. Through this TR method, construction planned grounds located near railroad areas were selected and ground vibration measurement was conducted. Through natural frequency by MIDAS, vertical acceleration response, and ground frequency from measured vibration response, TR was calculated and vibration prediction was conducted. As a result of comparing acceleration response estimate applying TR and measured value of train vibration acceleration response, it was found that it was in 3.61%~37.1% of margin of error. Clear peak of 7.19~10.61Hz in KTX, Gyungeuisun, and cement train were confirmed.

NIR reflecting properties of TiO2/Ag/TiO2 multilayers deposited by DC/RF magnetron sputtering (DC/RF 마그네트론 스퍼터링법을 이용한 TiO2/Ag/TiO2 하이브리드 다층박막의 적외선 반사 특성)

  • Kim, Seong-Han;Kim, Seo-Han;Song, Pung-Geun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.158-158
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    • 2016
  • 최근 화석연료의 고갈과 환경 보전 및 에너지 절약에 대한 관심이 높아짐에 따라 화석연료의 소비를 최소화하고 실내조건을 쾌적하게 유지하려는 연구가 진행되고 있다. 국내의 경우 전체 에너지 소비의 30%이상을 차지하고 있는 건물부문에서의 에너지 소비를 줄이기 위한 활발한 연구가 진행되고 있으며 이에 따른 에너지절약 소재개발이 활발하게 진행되고 있다. 1975년 이후 여러 차례에 걸친 단열강화 조치를 통해 건물에서의 에너지 소모를 줄이고 있었으나 건물의 외벽에 대한 사항으로 한정되어있었고, 또한 건물의 창 면적이 증가함에 따라 창을 통한 열손실량과 열획득량이 더욱 증가하게 되었다. 이러한 문제를 해결하기 위해 열반사유리에 대한 많은 연구가 진행되고 있다. 열반사유리는 근적외선(열선)영역의 빛을 반사시켜 실내의 열손실량 및 외부에서의 열획득량을 감소시켜 에너지의 소비를 줄일 수 있는 유리을 말한다. 이러한 열반사유리은 fresnel 방정식을 통해 빛의 파장대에 따른 반사율 및 투과도를 예측할 수 있는데, 다층박막구조인 Oxide-Metal-Oxide(OMO)구조는 Oxide의 높은 굴절률과 Metal의 낮은 굴절률을 통해 가시광영역대의 높은 투과도와 근적외선 영역의 높은 반사율을 얻을 수 있다. 또한 Metal층을 삽입함으로서 flexible한 코팅이 가능하고, 높은 carrier density와 mobility로 표면 플라즈몬 공명을 통해 특정 파장대의 반사율을 높일 수 있으므로 많은 연구가 진행되고 있다. $TiO_2$는 고굴절률 및 낮은 광흡수성의 특성을 가지는 산화물반도체로 기존의 $In_2O_3$계 산화물에 비해 값이 싸고 높은 안정성과 광촉매특성을 보이므로 외부에 노출된 환경에 적합한 재료이다. Ag는 저굴절률과 낮은 광흡수성을 가지는 재료로 금속층에 적합하다. 본 연구에서는 fresnel 방정식을 통해 반사도 및 투과도를 예측하고 마그네트론 스퍼터링법으로 다층박막을 열선인 적외선 영역에서의 반사율 및 반사 효율을 평가하였다. Index-matching 시뮬레이션을 통해 $TiO_2/Ag/TiO_2$ 다층박막의 투과도와 반사도를 이론적으로 검토하였다. 시뮬레이션 프로그램은 Macleod프로그램을 이용하였고 재료 각각의 굴절률은 Ellipsometry를 이용하여 측정하였다. 두께 40 nm 와 8 ~ 16 nm를 가지는 $TiO_2$층과 Ag층을 각각 RF/DC 마그네트론 스퍼터링법을 이용하여 Glass기판 위에 증착하였다. 직경 3 in 의 $TiO_2$, Ag 소결체 타깃을 이용하였고 스퍼터링 파워는 각각 200 W, 50 W로 설정하였고, 스퍼터링 가스는 Ar가스의 유량을 20 sccm으로 설정하였다. 작업압력은 모두 1 Pa로 설정하였고 타깃 표면의 불순물 및 이물질 제거를 위해 Pre-sputtering을 10분 진행하였다. 박막의 두께는 reflectometer와 Alphastep을 이용하여 측정하였고 Hall effect measurement를 이용하여 비저항, carrier density, mobility등 전기적 특성을 측정하였다. 또한 UV-VIS spectrometer와 USPM-RU-W NIR Micro-Spectrophotometer를 통해 광학적 특성을 측정하였고 계산 값과 비교분석하였다. 또한 열반사 특성을 평가하기 위해 직접 set-up한 장비를 이용하였다. 단열 박스에 샘플을 장착해 적외선 램프를 조사하였을 때의 열 반사효율을 평가하였고, IR Camera를 이용하여 단열 박스 내부의 온도 변화를 관찰하였다.

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Agronomic Characteristics and Silage Quality of Corn Hybrids Produced from Yoju and Ichon Dairy Farms (여주 및 이천지역 낙농목장 옥수수의 생육특성과 사일리지의 품질)

  • Kim, Dong Am;Jo, Mu Hwan;Gwon, Chan Ho;Han, Geon Jun;Kim, Jong Gwan
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.13 no.4
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    • pp.305-311
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    • 1993
  • Although corn (Zea mays L.) hybrids are now widely grown as a silage crop in Korea, but agronomic data and silage quality of the corn hybrids produced from farmer's fields have not been published. Therefore, a research survey assessing forage yield and quality of the corn hybrids was conducted at 8 and 13 dairy farms in 1988 and 1989, respectively. in Yoju and Ichon. Kyeongi Province. In 1988, percent ear bearing plants, plant population, ear/total dry matter ratio. percent dry matter and dry matter yield of corn hybrids were 75.3%, 75,826 plants/ha, 38.3%, 23.8% and 12,661 kg/ha. respectively. compared with corresponding values of 79.5%. 79,981 plants/ha, 41.1%. 20.7% and 16.152 kg/ha in 1989, but 11.9% of rice black streaked dwarf virus (RBSDV) was recorded in 1989. The Flieg's score of corn silage made by dairy farmers ranged from 70 to 100 and averaged 91. The corn silage produced from dairy farms was characterized as a high quality grade. Survey data indicated that late maturing types of corn hybrids with a higher plant population were grown at farmer's fields. As a result, the performances of the corn hybrids produced by farmers were much lower than those of research institutes. Therefore, dairy farmers in the mid-northern regions of Korea should grow more early maturing corn hybrids and use much lower plant population than those of the present.

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Nonlinear Finite Element Analysis of PHWR Containment Building (가압중수형 격납건물의 비선형 유한요소해석)

  • Lee, Hong-Pyo;Song, Young-Chul
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.287-290
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    • 2009
  • 이 논문에서는 가압중수형(Pressurized Heavy Water Reactor) 프리스트레스 콘크리트 격납건물의 1/4 축소모델에 대한 극한내압능력과 전반적인 비선형거동에 관한 유한요소 해석을 수행하였다. 가압중수형 격납건물은 원통형 벽체와 돔으로 구성되었고, 4개의 부벽을 갖는다. 유한요소해석을 위해서 상용코드 ABAQUS를 이용하였고, 콘크리트, 철근 및 텐던에 대한 수치모델링을 작성하여 자중과 내압하중을 적용하였고, 텐던의 2% 변형률을 기준으로 극한내압능력을 평가하였다. 이때 사용된 재료모델로 콘크리트는 Concrete Damaged Plasticity 모델을 사용하였고, 철근과 텐던은 Elasto-Plastic 모델을 적용하였다. 유한요소 해석결과 콘크리트의 초기균열 0.41MPa에서 발생하였고, 극한내압은 0.56MPa 정도로 평가되었다.

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Development of a Planting Density-Growth-Harvest Chart for Common Ice Plant Hydroponically Grown in Closed-type Plant Production System (식물 생산 시스템에서 수경재배한 Common Ice Plant의 재식밀도-생육-수확 도표 개발)

  • Cha, Mi-Kyung;Park, Kyoung Sub;Cho, Young-Yeol
    • Journal of Bio-Environment Control
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    • v.25 no.2
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    • pp.106-110
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    • 2016
  • In this study, a planting density-growth-harvest (PGH) chart was developed to easily read the growth and harvest factors such as crop growth rate, relative growth rate, shoot fresh weight, shoot dry weight, harvesting time, marketable rate, and marketable yield of common ice plant (Mesembryanthemum crystallinum L.). The plants were grown in a nutrient film technique (NFT) system in a closed-type plant factory using fluorescent lamps with three-band radiation under a light intensity of $140{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ and a photoperiod of 12 h. Growth and yield were analyzed under four planting densities ($15{\times}10cm$, $15{\times}15cm$, $15{\times}20cm$, and $15{\times}25cm$). Shoot fresh and dry weights per plant increased at a higher planting density until reached an upper limit and yield per area was also same tendency. Crop growth rate, relative growth rate and lost time were described using quadratic equation. A linear relationship between shoot dry weight and fresh weights was observed. PGH chart was constructed based on the growth data and making equations. For instance, with within row spacing (= 20 cm) and fresh weight per plant at harvest (= 100 g), we can estimate all the growth and harvest factors of common ice plant. The planting density, crop growth rate, relative growth rate, lost time, shoot dry weight per plant, harvesting time, and yield were $33plants/m^2$, $20g{\cdot}m^{-2}{\cdot}d^{-1}$, $0.27g{\cdot}g^{-1}{\cdot}d^{-1}$, 22 days, 2.5 g/plant, 26 days after transplanting, and $3.2kg{\cdot}m^{-2}$, respectively. With this chart, we could easily obtain the growth factors such as planting density, crop growth rate, relative growth rate, lost time and the harvest factors such as shoot fresh and dry weights, harvesting time, marketable rate, and marketable yield with at least two parameters, for instance, planting distance and one of harvest factors of plant. PGH charts will be useful tools to estimate the growth and yield of crops and to practical design of a closed-type plant production system.

The Evaluation in Displacement Response of Tapered Tall Buildings to Wind Load (풍하중을 받는 테이퍼 고층건물의 진동변위응답 평가)

  • Cho, Ji-Eun;You, Ki-Pyo;Kim, Jong-Soo;Kim, Young-Moon
    • Journal of Korean Association for Spatial Structures
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    • v.5 no.4 s.18
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    • pp.101-108
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    • 2005
  • The investigations for mitigating wind-induced excitations of tall buildings have been carried out. The aerodynamic modification of a building shape changing the cross-section with height through tapering, which alters the flow pattern around the building, could reduce wind induced excitations of tall buildings. The fart that a tapered tall building might spread the vortex-shedding over a broad range of frequencies makes more effective for reducing acrosswind responses has been established. In this paper, to investigate the tapering effect for reducing wind-induced responses of a tapered tall building, high-frequency force-balance test was conducted. The six types of building models which have different taper ratio of 2.5%, 5%, 7.5%, 10%, 15% and one basic building model of a square cross-section were tested under the two typical boundary layers representing suburban and urban flow environment. The effect of wind direction was also considered.

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