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소규모저수지의 예·경보를 위한 계측기 설치에 관한 연구
김선국(Sunkuk Kim),정인주(InJu Jeong),안동희(Donghee An) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.6
기후변화로 인해 국지성 집중호우가 빈번하게 발생하고, 연속적인 폭우 등으로 인하여 2015년부터 2019년까지 101개의 저수지 붕괴가 발생하고 있다. 본 논문은 저수지 조기경보 및 예·경보 시스템의 운영과 유지관리 효율성의 극대화를 위해 현장상황에 맞는 계측기를 선정하고 적절하게 배치하는데 중점을 두었다. 이에 따라, 본 연구에서는 6개소의 소규모 저수지를 대상으로 연구를 수행하였으며, 저수지 제체 내에 중앙점토 코어 존의 존재 유무에 따른 침투수를 비교·분석하였다. 연구 결과, 저수지 파이핑 붕괴 예측을 위하여 제체 하류사면 길이(L)에 대한 습윤길이(l)를 산정하여 습윤비율((l/L)은 50%를 적용하는 것이 적절한 것으로 검토되어 계측기기의 위치를 선정하는데 방법론을 제시하였다. Climate change is causing the collapse of 101 reservoirs due to localized torrential rains and continuous heavy rains. To minimize the damage to human life and property, this article focuses on selecting appropriate local instruments for the efficient maintenance and proper arrangement of these instruments to maximize the efficiency of the early warning and predictive warning systems. In this study, six small-scale reservoirs were studied, and two cases were considered and compared, namely an embankment with a central clay core and a simply earth-filled embankment. The results showed that to predict the collapse of the reservoir by piping, it was considered appropriate to apply 50% of the wetness ratio (l/L) by calculating the wet length (l) on the length (L) of the downstream slope of the embankment. Finally, a methodology was presented for selecting the location of the measuring device.
김기호 ( Kim Ki-ho ),김도영 ( Kim Do-yeong ),장덕배 ( Jang Duk-bae ),김선국 ( Kim Sunkuk ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
As the building becomes more sophisticated, indoors and outdoors exterior decoration of construction has been increased. However, it is very difficult to produce an FDM(Free-form Decorative Mold) that meets the requirements of quality, durability, and ease of installation, resulting in a high cost. Therefore, the objective of this study is basic research for economical production of FDM production technology while satisfying the above requirements. For this study, the authors analyze the details of the shape and requirements of the FDM, and the production details and processes that reflect the characteristics. The results of this study can utilize to develop algorithms for production and management of academically efficient FDM and can utilize to secure FDM production technology at commercial level.
BIM 기반 형상코드를 이용한 보 철근길이 자동 산장 기초 연구
다니엘 ( Widjaja Daniel Darma ),김선국 ( Kim Sunkuk ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Construction of reinforced concrete structures required massive amounts of concrete and steel rebar. The current procedure to estimate the quantity of rebar requires tedious and time-consuming manual labor. Consequently, this circumstance made the engineers vulnerable to error and mistake, which led to the rebar waste. No system that is capable of automatically calculating rebar length has yet been developed Thus, this study proposes a preliminary investigation of automatic rebar length estimation of beam element by using BIM-based shape codes drawn in Revit. Beam is chosen due to its complexity in the rebar arrangement. In addition, the development of this study could assist engineers on the construction site and effectively contribute to the minimization of rebar waste in the future.
BIM 기반 형상코드를 이용한 내력벽 철근길이 자동 산정 기초 연구
임지영 ( Lim Jeeyoung ),김선국 ( Kim Sunkuk ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Reinforced concrete structures require large amounts of concrete and rebar in the construction stage. Rebar is a major resource for reinforced concrete structures, and generates more CO<sub>2</sub> per unit weight than other materials. To solve this problem, it was confirmed that the cutting waste can be close to zero when the special length of the rebar is calculated in the drawing created after structural design. However, a system for automatically calculating the length of reinforcing bars to efficiently calculate the total amount of reinforcing bars has not been established. Therefore, the objective of this study is a basic study of automatic rebar length estimate algorithm of bearing wall by using BIM-based shape codes built in Revit. The bearing wall rebar can be automatically derived using the developed model. Furthermore, through applying the developed model to the construction field, it will greatly contribute to reducing greenhouse gas emissions by reducing rebar cutting waste.
홍희기(Hiki Hong),김선국(Sunkuk Kim),유호선(Hoseon Yoo) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
This study was performed to determine the heating energy savings and CO₂ reduction resulting from turning off ondol heating in housing units in Korea. Lowering the room temperature and intermittent heating of a room are effective methods for reducing heating energy consumption. These techniques were proven by modeling simulations in our previous studies. To confirm the simulations, schedule controllers which automatically turned off the ondol heating in the living room and kitchen from 10 pm to 6 am were in stalled at the hot water distributor in five households. The heating gas used in each of the housing units was measured over a period of five years, with and without the schedule controllers. We found that approximately 30% of gas consumption, mainly used for heating, can be saved compared to turning on the appliance during the night.
거더교 상판 콘크리트 타설용 거푸집 개발 및 경제성 분석
임지영 ( Jeeyoung Lim ),김선국 ( Sunkuk Kim ),손기영 ( Kiyoung Son ) 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.3
In the case of South Korea, steel girder bridge (steel box or H-steel) and PSC (Pre-Stressed Concrete) girder bridge are the representative upper structures of railroad and road bridges. These structures account for 75% of the total bridge constructions and 80% of the total construction cost. Since the form work for concreting bridge slab is difficult, various construction methods developed and applied. However, several problems in those methods did not solve partially, including cost increase by material loss and rise of labor costs, quality deterioration by unskilled workers, increased construction time by complicated method, reduced productivity, safety accident by high place work, difficult transportation by big member, and rise of maintenance cost by material characteristic. Alternative method is needed to solve problems of as-is methods. Therefore, the purpose of this study is development of the purlin hanging system form for the girder bridge slab and its economic analysis. Through the findings of this study, it was verified that the purlin hanging system form is possible 60% reduction in cost and 80% reduction in time as comparison with conventional method.