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김창윤(Changyoon Kim),문현석(Hyoun-Seok. Moon),원지선(Ji-Sun. Won),주기범(Ki-Beom. Ju) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
Recently, Building Information Modeling (BIM) technology has been widely used to improve quality of construction design and productivity of construction projects. However, due to the limited research on Industry Foundation Classes (IFC) extension, there are difficulties on expressing data schema for infrastructure. To address this problem, research efforts have been conducted to extend data schema for infrastructure such as road, bridge, and tunnel. Despite the research efforts on IFC extension of infrastructure, data schema for earth work has not been discussed because of the continuous changes of earth work object shape and irregular shape of the earth work objects. In this research, to express the data model of the earth work object, extension of IFC core schema for earth work object is suggested based on standard drawing of the road and earth work. The suggested IFC core schema for earth work object has potential to overcome current problems on expressing data model of earth work objects.
Jeong, Jaewook,Ji, Changyoon,Hong, Taehoon,Park, Hyo Seon American Society of Civil Engineers 2016 Journal of management in engineering Vol.32 No.2
<P>Evaluating the financial viability of a build-operate-transfer project for highway service areas (HSA BOT project) in South Korea is very important for the private sector because it does not have a risk-allocation agreement with the public sector, such as the minimum revenue guarantee. In this study, a model to evaluate the financial viability of a HSA BOT project is developed based on the discounted cash flow analysis and the real option valuation. The developed model can evaluate the financial viability of the HSA BOT project more robustly and comprehensively than existing methods by considering the characteristics of the HSA BOT project as well as the value of the HSA BOT projects due to the future uncertainty that the existing methods cannot consider. The case study shows that compared to the result from the existing methods, the result from the developed model is close to the actual results of the case project. It is expected that the private sector can use the developed model to determine the investment decision for HSA BOT projects. (C) 2015 American Society of Civil Engineers.</P>
Jeong, Kwangbok,Ji, Changyoon,Kim, Hyunjung,Hong, Taehoon,Cho, Kyuman,Lee, Jaewook Elsevier 2019 Journal of Cleaner Production Vol.239 No.-
<P><B>Abstract</B></P> <P>The sustainable building materials and construction methods have been recently highlighted to reduce the environmental and human health impacts. The steel sump is regarded as a suitable alternative to the concrete sump as it has a lower economic impact, but further research on its environmental and human health impacts has yet to be conducted. Thus, this study conducted an integrated assessment of the environmental, human health, and economic impacts of the concrete and steel sumps using life cycle assessment. When the environmental, human health, and economic impacts are considered at the same time, the installation scenarios of the steel sump were superior to those of the concrete sump by 11.35–152.24%. Especially, SS-3 (i.e., installation scenarios #3 of steel sump) has 93.04 and 89.18% lower environmental and human health impacts, respectively, as well as an 81.47% lower construction cost compared to CS-3 (i.e., installation scenarios #3 of concrete sump). This is because the differences in the building material and the practical construction method used determine the environmental, human health, and economic impacts of the sump. The results will help designers or construction managers determine the installation scenario of the sump by considering its environmental, human health, and economic impacts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An integrated assessment method of building material was proposed in this study. </LI> <LI> An integrated assessment considers environmental, human health, and economic impacts. </LI> <LI> All installation scenarios of steel sump are superior to those of concrete sump. </LI> <LI> Integrated score can be used as a guideline for selecting building material. </LI> <LI> It can help decision-makers to determine the optimal installation scenario of sump. </LI> </UL> </P>
Assessment Model for Energy Consumption and Greenhouse Gas Emissions during Building Construction
Hong, Taehoon,Ji, ChangYoon,Jang, MinHo,Park, HyoSeon American Society of Civil Engineers 2014 Journal of management in engineering Vol.30 No.2
Many studies use life-cycle assessment (LCA) as a tool to quantify the environmental impact of buildings. Most of these studies have focused on the maintenance and operation phases of construction projects, which account for the largest part of energy consumption during the life cycle of buildings. However, the construction phase may cause significant environmental impacts, so a detailed analysis on the construction phase is required to conduct a more accurate assessment of the energy consumption and environmental impact of a building's entire life cycle. To assess energy consumption and greenhouse gas (GHG) emissions, this study developed a model using process-based LCA and input-output (I-O) LCA. This study divided the construction phase into material manufacturing, transportation, and on-site construction, and applied an appropriate methodology for each part. The analysis of an apartment building project using the developed model showed that the material manufacturing stage had the largest amount of energy consumption and GHG emissions. Quantitatively, material manufacturing, transportation, and on-site construction phases were responsible for 94.89, 1.08, and 4.03% of energy consumption, and 95.16, 1.76, and 3.08% of global warming potential, respectively. It is believed that the developed model would allow a more accurate assessment of energy consumption and GHG emissions during a building's construction phase.
Prediction of Environmental Costs of Construction Noise and Vibration at the Preconstruction Phase
Hong, Taehoon,Ji, ChangYoon,Park, Joowan,Leigh, Seung-Bok,Seo, Dong-yeon American Society of Civil Engineers, Engineering M 2015 Journal of management in engineering Vol.31 No.5
<P> Construction noise and vibration in urban areas are environmental impacts that cause damage to humans. A model for predicting the environmental costs of construction noise and vibration was developed in this study. The model uses noise- and vibration-level data of construction equipment to predict the construction noise and vibration levels and estimates the environmental costs based on the predicted noise and vibration levels. Monte Carlo simulation was used to develop the model, considering the uncertainty of the noise- and vibration-level data of construction equipment. As it is difficult to collect actual compensation cost data for noise and vibration, the validity of the model was verified by comparing the actual noise and vibration levels measured at six receiving nodes with the predicted noise and vibration levels. The results showed that the predicted noise and vibration levels differed by 2.76 dBA (4.28%) and -3.76 dBV (-5.35%) from the actual noise and vibration levels, respectively. The correlation coefficients of the predicted and measured results were 0.991 and 0.982, respectively, which show that the model was reasonably accurate. The case study showed that the environmental cost of noise and vibration was US$237,679.25 when the noise barrier was not installed. It is expected that the developed model can be used to establish a mitigation strategy for contractors to reduce damage due to construction noise and vibration in the preconstruction phase. </P>
정광복(Jeong, Kwangboke),지창윤(Ji, Changyoon),김지민(Kim, Jimin),안상전(An, Sangjueon),이재욱(Lee, Jaewook) 한국생태환경건축학회 2021 한국생태환경건축학회 학술발표대회 논문집 Vol.21 No.2
Greenhouse gas emissions management in the construction sector is essential to achieve the carbon neutrality goal in 2050. This study estimated the annual greenhouse gas emissions intensity and regional greenhouse gas emissions from the incineration of construction waste. First, greenhouse gas emissions intensities from the incineration of construction waste were estimated as 0.03285 ㎏CO₂eq./KRW in 2016, 0.03319 ㎏CO₂eq./KRW in 2017, 0.03175 ㎏CO₂eq./KRW in 2018. Second, greenhouse gas emissions from the incineration of construction waste were estimated as 452.9 thousand tons CO₂eq. in 2016, 528.7 thousand tons CO₂eq. in 2017, and 4013 thousand tons CO₂eq. in 2018.