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Choongwan Koo
Division of Architecture & Urban Design, Incheon National University, Incheon, 22012, Republic of Korea

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Journal article
Published: 22 June 2021 in Journal of Cleaner Production
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The Korean government has initiated a “Green New Deal” policy, in which a smart energy platform was proposed for more efficient building energy management that could monitor energy consumption in real time and control electrical installation and appliance in a timely manner. With the energy bigdata collected via IoT-based smart energy meter, this study aimed to develop a scalable platform for investigating the space-specific features of the temporal energy usage pattern and the relevant energy saving potential by electrical installation (i.e., lighting, electrical appliances, heating & cooling systems) in a building. This study was conducted in four stages: (i) real-time bigdata collection; (ii) development of dashboard; (iii) scalable analysis of energy usage pattern; and (iv) scalable analysis of energy saving potential. Main finding can be summarized as follow. First, more than 50% of the energy usage in main spaces (i.e., classrooms) was consumed by the heating & cooling systems. Second, the total energy saving potential was estimated at 11.50% when applying the developed actuator to the standby power and electrical radiator. Third, the annual cost saving potential as economic feasibility was estimated at 11.13%. The proposed scalable platform can contribute to investigating the energy usage pattern by electrical installation from a spatio-temporal perspective and to changing the occupants’ behaviors for energy savings by considering space-specific features and occupancy patterns. The proposed novel approach can be extended to various types of buildings.

ACS Style

Junsoo Lee; Tae Wan Kim; Chansik Lee; Choongwan Koo. A scalable platform for investigating the space-specific features of the temporal energy usage pattern and saving potential with real-time bigdata. Journal of Cleaner Production 2021, 314, 128028 .

AMA Style

Junsoo Lee, Tae Wan Kim, Chansik Lee, Choongwan Koo. A scalable platform for investigating the space-specific features of the temporal energy usage pattern and saving potential with real-time bigdata. Journal of Cleaner Production. 2021; 314 ():128028.

Chicago/Turabian Style

Junsoo Lee; Tae Wan Kim; Chansik Lee; Choongwan Koo. 2021. "A scalable platform for investigating the space-specific features of the temporal energy usage pattern and saving potential with real-time bigdata." Journal of Cleaner Production 314, no. : 128028.

Journal article
Published: 22 April 2021 in Sustainability
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Hong Kong’s government has recently introduced the feed-in tariff scheme to promote the photovoltaic (PV) system as a promising way to address global warming. The feed-in tariff scheme depends on the type of the PV system and its installed capacity. This study aimed to investigate the techno-economic feasibility of mono-Si and poly-Si PV systems in the rooftop area of a commercial building, Pao Yue-Kong Library of Hong Kong, under the feed-in tariff scheme. The analysis was carried out in two phases: (i) technical analysis of the rooftop PV systems by considering the shading effect and solar radiation and (ii) economic feasibility of the rooftop PV systems under the feed-in tariff scheme from the life cycle perspective. The main findings of the case study can be summarized: (i) the rooftop area of the target building would not be significantly affected by surrounding buildings; (ii) the highest amount of solar radiation was estimated at 136.96 kWh/m2 in October, while the lowest value was 55.64 kWh/m2 in February; (iii) the total amount of module energy yield from the mono-Si PV system was estimated at 917.58 kWh/kW, indicating that it was very similar but a little bit lower (i.e., 0.48%) than that for the poly-Si PV system (i.e., 921.98 kWh/kW); and (iv) payback periods for mono-Si and poly-Si PV systems were estimated at 8.67 and 8.31 years, respectively. The feasibility study can contribute to providing facility managers with a practical guideline to determine the appropriate strategy in implementing the PV systems in buildings under the feed-in tariff scheme.

ACS Style

Ke Shi; Chuangyi Li; Choongwan Koo. A Techno-Economic Feasibility Analysis of Mono-Si and Poly-Si Photovoltaic Systems in the Rooftop Area of Commercial Building under the Feed-In Tariff Scheme. Sustainability 2021, 13, 4709 .

AMA Style

Ke Shi, Chuangyi Li, Choongwan Koo. A Techno-Economic Feasibility Analysis of Mono-Si and Poly-Si Photovoltaic Systems in the Rooftop Area of Commercial Building under the Feed-In Tariff Scheme. Sustainability. 2021; 13 (9):4709.

Chicago/Turabian Style

Ke Shi; Chuangyi Li; Choongwan Koo. 2021. "A Techno-Economic Feasibility Analysis of Mono-Si and Poly-Si Photovoltaic Systems in the Rooftop Area of Commercial Building under the Feed-In Tariff Scheme." Sustainability 13, no. 9: 4709.

Journal article
Published: 07 May 2020 in Renewable and Sustainable Energy Reviews
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Since a traditional centralized control system (e.g., building energy management system) with a fixed schedule and manual control is not appropriate to irregularly occupied rooms, it is expected to have a large amount of energy saving potential in operating the HVAC system. To overcome this challenge, this study aimed to develop a novel operation approach for the energy efficiency improvement of the HVAC system in office spaces. The real-time indoor environmental indicators were collected and analyzed to evaluate the current operation status of the HVAC system as well as to propose a novel control strategy in two ways. The significant findings can be illustrated as follows. First, it could be stated that occupants would tend to establish a lower set-point temperature for a cooler indoor environment. To solve this issue, a basic control strategy was proposed to detect the anomaly detection of the HVAC system and to automatically adjust the indoor temperature within a preferred range. Second, it could be evaluated that the HVAC system would be kept operating since occupants would forget to turn off the HVAC system after the meetings. To solve this issue, an advanced control strategy was proposed to operate the automatic on/off control of the HVAC system by considering the indoor temperature and CO2 concentration in real time. The proposed strategies can contribute to a large amount of energy savings in operating the HVAC system of irregularly occupied spaces.

ACS Style

Wenzhuo Li; Choongwan Koo; Taehoon Hong; Jeongyoon Oh; Seung Hyun Cha; Shengwei Wang. A novel operation approach for the energy efficiency improvement of the HVAC system in office spaces through real-time big data analytics. Renewable and Sustainable Energy Reviews 2020, 127, 109885 .

AMA Style

Wenzhuo Li, Choongwan Koo, Taehoon Hong, Jeongyoon Oh, Seung Hyun Cha, Shengwei Wang. A novel operation approach for the energy efficiency improvement of the HVAC system in office spaces through real-time big data analytics. Renewable and Sustainable Energy Reviews. 2020; 127 ():109885.

Chicago/Turabian Style

Wenzhuo Li; Choongwan Koo; Taehoon Hong; Jeongyoon Oh; Seung Hyun Cha; Shengwei Wang. 2020. "A novel operation approach for the energy efficiency improvement of the HVAC system in office spaces through real-time big data analytics." Renewable and Sustainable Energy Reviews 127, no. : 109885.

Erratum
Published: 25 April 2020 in Renewable Energy
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ACS Style

Choongwan Koo; Wenzhuo Li; Seung Hyun Cha; Shaojie Zhang. Corrigendum to “A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques” [Renew. Energy 133 (2019) 575–592]. Renewable Energy 2020, 156, 1389 -1394.

AMA Style

Choongwan Koo, Wenzhuo Li, Seung Hyun Cha, Shaojie Zhang. Corrigendum to “A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques” [Renew. Energy 133 (2019) 575–592]. Renewable Energy. 2020; 156 ():1389-1394.

Chicago/Turabian Style

Choongwan Koo; Wenzhuo Li; Seung Hyun Cha; Shaojie Zhang. 2020. "Corrigendum to “A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques” [Renew. Energy 133 (2019) 575–592]." Renewable Energy 156, no. : 1389-1394.

Construction management
Published: 11 March 2020 in KSCE Journal of Civil Engineering
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Life cycle CO2 emissions (LCCEs) including embodied and operational CO2 emissions (ECEs and OCEs) should be comprehensively understood for establishing strategies for reducing CO2 emissions of buildings. Meanwhile, as the climate has a huge impact on building energy consumption, ECEs and OCEs should be investigated considering the climate. This study investigated the relation between ECEs and OCEs of buildings in different climate zones by conducting life cycle assessment and statistical analysis of 39 elementary school buildings in South Korea. As a result, the climate zone was determined to be the significant influence factors. The mean values of ECEs, OCEs, and LCCEs in central region were 611, 2,81 7, and 3,428 kg-CO2/m2, respectively, and those in southern region were 620, 1,652, and 2,273 kg-CO2/m2. The OCEs in central region was significantly higher than that in southern region, but the ECEs was not. In particular, ECEs and OCEs had a significant inverse correlation in central region but not in southern region. The results indicate that different strategies should be established depending on the climate zone. For instance, the thermal insulation levels should be further strengthened to reduce OCEs in central region compared to those of southern region.

ACS Style

Changyoon Ji; Taehoon Hong; Kwangbok Jeong; Jimin Kim; Choongwan Koo; Minhyun Lee; Seungwoo Han; Youngcheol Kang. Embodied and Operational CO2 Emissions of the Elementary School Buildings in Different Climate Zones. KSCE Journal of Civil Engineering 2020, 24, 1037 -1048.

AMA Style

Changyoon Ji, Taehoon Hong, Kwangbok Jeong, Jimin Kim, Choongwan Koo, Minhyun Lee, Seungwoo Han, Youngcheol Kang. Embodied and Operational CO2 Emissions of the Elementary School Buildings in Different Climate Zones. KSCE Journal of Civil Engineering. 2020; 24 (4):1037-1048.

Chicago/Turabian Style

Changyoon Ji; Taehoon Hong; Kwangbok Jeong; Jimin Kim; Choongwan Koo; Minhyun Lee; Seungwoo Han; Youngcheol Kang. 2020. "Embodied and Operational CO2 Emissions of the Elementary School Buildings in Different Climate Zones." KSCE Journal of Civil Engineering 24, no. 4: 1037-1048.

Journal article
Published: 01 October 2019 in Building and Environment
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ACS Style

Seung Hyun Cha; Choongwan Koo; Tae Wan Kim; Taehoon Hong. Spatial perception of ceiling height and type variation in immersive virtual environments. Building and Environment 2019, 163, 1 .

AMA Style

Seung Hyun Cha, Choongwan Koo, Tae Wan Kim, Taehoon Hong. Spatial perception of ceiling height and type variation in immersive virtual environments. Building and Environment. 2019; 163 ():1.

Chicago/Turabian Style

Seung Hyun Cha; Choongwan Koo; Tae Wan Kim; Taehoon Hong. 2019. "Spatial perception of ceiling height and type variation in immersive virtual environments." Building and Environment 163, no. : 1.

Journal article
Published: 13 October 2018 in Renewable Energy
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As a clean and sustainable energy resource with lower environmental impact, the Chinese government encourages the application of solar energy system. The global solar radiation on the horizontal surface in the specific site should be investigated in advance so that the solar energy system could be implemented properly and efficiently. However, the monthly average daily solar radiation (MADSR) in China has complex spatial patterns, and its observation stations are still lacking due to the high cost of equipment. To address these challenges, this study aimed to develop a novel estimation approach for the MADSR with its complex spatial pattern over a vast area in China via machine-learning techniques (i.e. a clustering method (k-means) and an advanced case-based reasoning (A-CBR) model). The MADSR and the relevant information were collected from 97 cities in China for 10 years (from 2006 to 2015). The average prediction accuracy of the proposed approach was determined at 93.23%, showing a promising way. The proposed novel approach is expected to be generalized via the interpolation methods (e.g. kriging method in a geographical information system) so that decision-makers (e.g. construction manager or facility manager) can determine the appropriate location, size and form in implementing the solar energy system.

ACS Style

Choongwan Koo; Wenzhuo Li; Seung Hyun Cha; Shaojie Zhang. A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques. Renewable Energy 2018, 133, 575 -592.

AMA Style

Choongwan Koo, Wenzhuo Li, Seung Hyun Cha, Shaojie Zhang. A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques. Renewable Energy. 2018; 133 ():575-592.

Chicago/Turabian Style

Choongwan Koo; Wenzhuo Li; Seung Hyun Cha; Shaojie Zhang. 2018. "A novel estimation approach for the solar radiation potential with its complex spatial pattern via machine-learning techniques." Renewable Energy 133, no. : 575-592.

Journal article
Published: 23 August 2018 in Building and Environment
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For indoor environmental quality (IEQ), previous studies only focused on one-sided aspect (e.g. monitoring, diagnostic, or intervention), and have not fully considered excessive pollutants and dew condensation in meeting rooms. Based on a real-time sensor network, this study newly implemented a three-phase cyclic process (i.e. monitoring-diagnostic-intervention process), with which a novel real-time method for HVAC system operation was developed to improve IEQ in meeting rooms. In particular, this study conducted two kinds of analyses and controls: (i) basic analysis and control for excessive pollutants by utilizing temperature and CO2 concentration; and (ii) advanced analysis and control for dew condensation on the diffuser of HVAC system by utilizing temperature, humidity, and CO2 concentration. The main findings were summarized as follows. For the "basic analysis", the CO2 concentration was estimated to exceed 1000 ppm at 14.8% and 31.7% in two meeting rooms. To avoid it, a real-time "basic control" strategy was developed: if the CO2 concentration would exceed 1000 ppm, the ventilation volume of the outdoor air could increase in real time. For the "advanced analysis", dew condensation on the diffuser was estimated to happen at 40.7% and 82.6% in two meeting rooms. To avoid it, a real-time "advanced control" strategy was developed: if the estimated supply air temperature would be lower than the calculated dew-point temperature, the supply-air temperature and ventilation volume of HVAC system could increase. The novel real-time method can be easily applied to HVAC system operation in existing buildings where events are hard to be predicted and recognized.

ACS Style

Wenzhuo Li; Choongwan Koo; Seung Hyun Cha; Taehoon Hong; Jeongyoon Oh. A novel real-time method for HVAC system operation to improve indoor environmental quality in meeting rooms. Building and Environment 2018, 144, 365 -385.

AMA Style

Wenzhuo Li, Choongwan Koo, Seung Hyun Cha, Taehoon Hong, Jeongyoon Oh. A novel real-time method for HVAC system operation to improve indoor environmental quality in meeting rooms. Building and Environment. 2018; 144 ():365-385.

Chicago/Turabian Style

Wenzhuo Li; Choongwan Koo; Seung Hyun Cha; Taehoon Hong; Jeongyoon Oh. 2018. "A novel real-time method for HVAC system operation to improve indoor environmental quality in meeting rooms." Building and Environment 144, no. : 365-385.

Chapter
Published: 31 July 2018 in Smart and Sustainable Planning for Cities and Regions
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The residential progressive electricity tariffs (RPET), which can affect the economic performance of the photovoltaic (PV) system, was recently amended in South Korea. In this regard, this study aimed to analyze the effect of RPET on the economic performance of the building-integrated photovoltaic blind (BIPB). This study was conducted in three steps: (i) development of an estimation model for the techno-economic performance of BIPB, (ii) establishment of representative household types, and (iii) impact analysis of RPET on the economic performance of BIPB. The main findings can be summarized as follows. First, the yearly based mean absolute percentage error of the developed finite element model was determined to be 4.54%. Second, considering RPET, the economic performance of BIPB was analyzed to be higher in the case of the households with a larger amount of electricity consumption. This study can provide decision-makers with intuitive results on the economic performance of BIPB considering RPET.

ACS Style

Jeongyoon Oh; Choongwan Koo; Taehoon Hong. Energy Efficiency in the Building Sector: The Effect of Residential Progressive Electricity Tariffs on the Economic Performance of the Building-Integrated Photovoltaic Blind. Smart and Sustainable Planning for Cities and Regions 2018, 793 -808.

AMA Style

Jeongyoon Oh, Choongwan Koo, Taehoon Hong. Energy Efficiency in the Building Sector: The Effect of Residential Progressive Electricity Tariffs on the Economic Performance of the Building-Integrated Photovoltaic Blind. Smart and Sustainable Planning for Cities and Regions. 2018; ():793-808.

Chicago/Turabian Style

Jeongyoon Oh; Choongwan Koo; Taehoon Hong. 2018. "Energy Efficiency in the Building Sector: The Effect of Residential Progressive Electricity Tariffs on the Economic Performance of the Building-Integrated Photovoltaic Blind." Smart and Sustainable Planning for Cities and Regions , no. : 793-808.

Journal article
Published: 06 July 2018 in Applied Energy
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There has been growing interest in the distributed solar generation (DSG) system in accordance with the ‘Post-2020 Climate Change Agreement’, especially for the reduction of greenhouse gas emissions from buildings. In this respect, this study aimed to develop an integrated model for estimating the techno-economic performance of the DSG system on building façades, with a focus on energy demand and supply. The integrated model was developed in five stages: (i) definition of design variables affecting the DSG system on building façades; (ii) establishment of a standard database for the DSG system on building façades using energy simulation; (iii) technical analysis of the DSG system on building façades using the finite element method; (iv) economic analysis of the DSG system on building façades through life-cycle cost analysis; and (v) systemization. Detailed analyses were conducted in three aspects: (i) nonlinearity analysis; (ii) validation of the developed model; and (iii) practical application (to the ‘S’ apartment block in South Korea). With the newly developed integrated model (i-FEM), it was found that the technical performance of the DSG system could be accurately estimated in only 6 s: (i) heating energy demand (1.01%); (ii) cooling energy demand (9.27%); and (iii) building energy supply (3.55%). It is expected that decision-makers (e.g. construction managers or facility managers) can use the newly developed integrated model (i-FEM) to evaluate the potential impact of the DSG system on building façades in a timely and accurate manner.

ACS Style

Jeongyoon Oh; Choongwan Koo; Taehoon Hong; Seung Hyun Cha. An integrated model for estimating the techno-economic performance of the distributed solar generation system on building façades: Focused on energy demand and supply. Applied Energy 2018, 228, 1071 -1090.

AMA Style

Jeongyoon Oh, Choongwan Koo, Taehoon Hong, Seung Hyun Cha. An integrated model for estimating the techno-economic performance of the distributed solar generation system on building façades: Focused on energy demand and supply. Applied Energy. 2018; 228 ():1071-1090.

Chicago/Turabian Style

Jeongyoon Oh; Choongwan Koo; Taehoon Hong; Seung Hyun Cha. 2018. "An integrated model for estimating the techno-economic performance of the distributed solar generation system on building façades: Focused on energy demand and supply." Applied Energy 228, no. : 1071-1090.

Journal article
Published: 06 July 2018 in Applied Energy
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To cope with the approaching POST-2020 scenario, the national CO2 emission in the building sector, which accounts for 25.5% of the total CO2 emissions, should be managed effectively and efficiently. To do this, it is essential to forecast the national CO2 emissions in the building sector by region. As the South Korean government does not currently do this by region, regional characteristics are rarely taken into consideration when managing the national CO2 emissions in the building sector. Towards this end, this study developed an optimized gene expression programming model for forecasting the national CO2 emissions in 2030 using the metaheuristic algorithms. Compared to the forecasting performance of the gene expression programming model, the forecasting performance of the optimized gene expression programming – harmony search optimization model has improved by 7.11, 2.05, and 2.06% in terms of the mean absolute error, root mean square error, and mean absolute percentage error, respectively. Various national CO2 emissions scenarios in the building sector were established in order to better analyze the variation range of the national CO2 emissions in the building sector. Compared to the national CO2 emissions in 2016 (i.e., scenario 1: 41,337 ktCO2; scenario 2: 45,373 ktCO2; scenario 3: 46,024 ktCO2) in multi-family housing complexes, the national CO2 emissions in 2030 (i.e., scenario 1: 37,579 ktCO2; scenario 2: 37,736 ktCO2; scenario 3: 37,754 ktCO2) in multi-family housing complexes are forecasted to increase by 10.00–21.91%. The developed optimized gene expression programming – harmony search optimization model will potentially be able to assist policymakers in central and local governments forecast the national CO2 emissions in 2030. Through this, national CO2 emission management that more closely reflects the characteristics at the regional or national level can be supported.

ACS Style

Taehoon Hong; Kwangbok Jeong; Choongwan Koo. An optimized gene expression programming model for forecasting the national CO2 emissions in 2030 using the metaheuristic algorithms. Applied Energy 2018, 228, 808 -820.

AMA Style

Taehoon Hong, Kwangbok Jeong, Choongwan Koo. An optimized gene expression programming model for forecasting the national CO2 emissions in 2030 using the metaheuristic algorithms. Applied Energy. 2018; 228 ():808-820.

Chicago/Turabian Style

Taehoon Hong; Kwangbok Jeong; Choongwan Koo. 2018. "An optimized gene expression programming model for forecasting the national CO2 emissions in 2030 using the metaheuristic algorithms." Applied Energy 228, no. : 808-820.

Journal article
Published: 01 June 2018 in Building and Environment
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People have negative perceptions of underground environments on account of the absence of natural elements. To alleviate negative perceptions, many investigators have proposed indoor plants and artificial windows. Although a few studies have provided quantitative evidence of the benefits of indoor plants and artificial windows in an otherwise windowless environment, research has yet to systematically investigate these effects in an underground environment. To address this gap in our knowledge, the present study investigated the effects of indoor plants and artificial windows in an underground environment by means of a room-assessment questionnaire, an electrodermal activity (EDA) measure, and a response-time task. The findings indicate that indoor plants in an underground environment increase positive perceptions along the semantic-differential scales “Artificial–Natural”, “Unsuitable for a task–Suitable for a task” and “Monotonous–Diverse”, and that they reduce response times. By contrast, artificial windows are effective only on the “Monotonous–Diverse” scale, and are associated with increased response time. These findings should contribute to improvements in underground environments using indoor plants and artificial windows, so that people can maintain above-ground ways of living and working.

ACS Style

Jeonghwan Kim; Seung Hyun Cha; Choongwan Koo; Shiu-Keung Tang. The effects of indoor plants and artificial windows in an underground environment. Building and Environment 2018, 138, 53 -62.

AMA Style

Jeonghwan Kim, Seung Hyun Cha, Choongwan Koo, Shiu-Keung Tang. The effects of indoor plants and artificial windows in an underground environment. Building and Environment. 2018; 138 ():53-62.

Chicago/Turabian Style

Jeonghwan Kim; Seung Hyun Cha; Choongwan Koo; Shiu-Keung Tang. 2018. "The effects of indoor plants and artificial windows in an underground environment." Building and Environment 138, no. : 53-62.

Journal article
Published: 01 April 2018 in Applied Energy
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As interest in the distributed generation of solar power system in a building façade continues to increase, its technical performance (i.e. the amount of electricity generation) should be carefully investigated before its implementation. In this regard, this study aimed to develop the nine-node-based finite element model for estimating the technical performance of the distributed generation of solar power system in a building façade (FEM9-node), focusing on the improvement of the prediction performance. The developed model (FEM9-node) was proven to be superior to the four-node-based model (FEM4-node), which was developed in the previous study, in terms of both prediction accuracy and standard deviation. In other words, the prediction accuracy (3.55%) and standard deviation (2.93%) of the developed model (FEM9-node) was determined to be superior to those of the previous model (FEM4-node) (i.e. 4.54% and 4.39%, respectively). The practical application was carried out to enable a decision maker (e.g. construction manager, facility manager) to understand how the developed model works in a clear way. It is expected that the developed model (FEM9-node) can be used in the early design phase in an easy way within a short time. In addition, it could be extended to any other countries in a global environment.

ACS Style

Choongwan Koo; Taehoon Hong; Jeongyoon Oh; Jun-Ki Choi. Improving the prediction performance of the finite element model for estimating the technical performance of the distributed generation of solar power system in a building façade. Applied Energy 2018, 215, 41 -53.

AMA Style

Choongwan Koo, Taehoon Hong, Jeongyoon Oh, Jun-Ki Choi. Improving the prediction performance of the finite element model for estimating the technical performance of the distributed generation of solar power system in a building façade. Applied Energy. 2018; 215 ():41-53.

Chicago/Turabian Style

Choongwan Koo; Taehoon Hong; Jeongyoon Oh; Jun-Ki Choi. 2018. "Improving the prediction performance of the finite element model for estimating the technical performance of the distributed generation of solar power system in a building façade." Applied Energy 215, no. : 41-53.

Journal article
Published: 01 February 2018 in Renewable and Sustainable Energy Reviews
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ACS Style

Taehoon Hong; Hyunji Yoo; Jimin Kim; Choongwan Koo; Kwangbok Jeong; Minhyun Lee; Changyoon Ji; Jaewook Jeong. A model for determining the optimal lease payment in the solar lease business for residences and third-party companies – With focus on the region and on multi-family housing complexes. Renewable and Sustainable Energy Reviews 2018, 82, 824 -836.

AMA Style

Taehoon Hong, Hyunji Yoo, Jimin Kim, Choongwan Koo, Kwangbok Jeong, Minhyun Lee, Changyoon Ji, Jaewook Jeong. A model for determining the optimal lease payment in the solar lease business for residences and third-party companies – With focus on the region and on multi-family housing complexes. Renewable and Sustainable Energy Reviews. 2018; 82 ():824-836.

Chicago/Turabian Style

Taehoon Hong; Hyunji Yoo; Jimin Kim; Choongwan Koo; Kwangbok Jeong; Minhyun Lee; Changyoon Ji; Jaewook Jeong. 2018. "A model for determining the optimal lease payment in the solar lease business for residences and third-party companies – With focus on the region and on multi-family housing complexes." Renewable and Sustainable Energy Reviews 82, no. : 824-836.

Review
Published: 08 December 2017 in Sustainability
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To cope with ‘Post-2020’, each country set its national greenhouse gas (GHG) emissions reduction target (e.g., South Korea: 37%) below its business-as-usual level by 2030. Toward this end, it is necessary to implement the net-zero energy building (nZEB) in the building sector, which accounts for more than 25% of the national GHG emissions and has a great potential to reduce GHG emissions. In this context, this study conducted a state-of-the-art review of nZEB implementation strategies in terms of passive strategies (i.e., passive sustainable design and energy-saving technique) and active strategies (i.e., renewable energy (RE) and back-up system for RE). Additionally, this study proposed the following advanced strategies for nZEB implementation according to a building’s life cycle: (i) integration and optimization of the passive and active strategies in the early phase of a building’s life cycle; (ii) real-time monitoring of the energy performance during the usage phase of a building’s life cycle. It is expected that this study can help researchers, practitioners, and policymakers understand the overall implementation strategies for realizing nZEB.

ACS Style

Jeongyoon Oh; Taehoon Hong; Hakpyeong Kim; JongBaek An; Kwangbok Jeong; Choongwan Koo. Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle. Sustainability 2017, 9, 2272 .

AMA Style

Jeongyoon Oh, Taehoon Hong, Hakpyeong Kim, JongBaek An, Kwangbok Jeong, Choongwan Koo. Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle. Sustainability. 2017; 9 (12):2272.

Chicago/Turabian Style

Jeongyoon Oh; Taehoon Hong; Hakpyeong Kim; JongBaek An; Kwangbok Jeong; Choongwan Koo. 2017. "Advanced Strategies for Net-Zero Energy Building: Focused on the Early Phase and Usage Phase of a Building’s Life Cycle." Sustainability 9, no. 12: 2272.

Journal article
Published: 01 November 2017 in Journal of Management in Engineering
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From a managerial perspective, prediagnosis of emergency response potential and decision support during rescue operations are essential for improving emergency response capability. Toward this end, this paper introduces a novel index to measure equipment availability at a certain location and time: rescue equipment mobilization potential within standard emergency response time (REMPSERT), which was estimated and visualized in a map based on the geographic information system (GIS). It is shown that the accuracy of the proposed map was in a highly acceptable range (i.e., 92.4%) compared with a commercialized navigation system. Using the validated map, two case studies are presented: (1) the prediagnosis of response potential (case: Seoul), and (2) the decision support for optimal dispatching of rescue equipment (case: Mauna Ocean Resort collapse), through which the utility and efficacy of the proposed map in emergency management were verified.

ACS Style

Daeho Kim; Taehoon Hong; Minhyun Lee; Choongwan Koo; Jimin Kim; Kwangbok Jeong. Mapping the Rescue Equipment Mobilization Potential: Decision Support Tool for Emergency Management. Journal of Management in Engineering 2017, 33, 04017037 .

AMA Style

Daeho Kim, Taehoon Hong, Minhyun Lee, Choongwan Koo, Jimin Kim, Kwangbok Jeong. Mapping the Rescue Equipment Mobilization Potential: Decision Support Tool for Emergency Management. Journal of Management in Engineering. 2017; 33 (6):04017037.

Chicago/Turabian Style

Daeho Kim; Taehoon Hong; Minhyun Lee; Choongwan Koo; Jimin Kim; Kwangbok Jeong. 2017. "Mapping the Rescue Equipment Mobilization Potential: Decision Support Tool for Emergency Management." Journal of Management in Engineering 33, no. 6: 04017037.

Journal article
Published: 18 October 2017 in Applied Sciences
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This study aims to design and develop the prototype models of the smart photovoltaic system blind (SPSB). To achieve this objective, the study defined the properties in three ways: (i) the photovoltaic (PV) panel; (ii) the tracking system; and (iii) the monitoring system. First, the amorphous silicon PV panel was determined as a PV panel, and the width and length of the PV panel were determined to be 50 mm and 250 mm, respectively. Second, the four tracker types (i.e., fixed type, vertical single-axis tracker, horizontal single-axis tracker, and azimuth-altitude dual-axis tracker) was applied, as well as the direct tracking method based on the amount of electricity generated as a tracking system. Third, the electricity generation and environmental conditions were chosen as factors to be monitored in order to evaluate and manage the technical performance of SPSB as a monitoring system. The prototype model of the SPSB is designed and developed for providing the electricity generated from its PV panel, as well as for reducing the indoor cooling demands through the blind’s function, itself (i.e., blocking out sunlight).

ACS Style

Kwangbok Jeong; Taehoon Hong; Choongwan Koo; Jeongyoon Oh; Minhyun Lee; Jimin Kim. A Prototype Design and Development of the Smart Photovoltaic System Blind Considering the Photovoltaic Panel, Tracking System, and Monitoring System. Applied Sciences 2017, 7, 1077 .

AMA Style

Kwangbok Jeong, Taehoon Hong, Choongwan Koo, Jeongyoon Oh, Minhyun Lee, Jimin Kim. A Prototype Design and Development of the Smart Photovoltaic System Blind Considering the Photovoltaic Panel, Tracking System, and Monitoring System. Applied Sciences. 2017; 7 (10):1077.

Chicago/Turabian Style

Kwangbok Jeong; Taehoon Hong; Choongwan Koo; Jeongyoon Oh; Minhyun Lee; Jimin Kim. 2017. "A Prototype Design and Development of the Smart Photovoltaic System Blind Considering the Photovoltaic Panel, Tracking System, and Monitoring System." Applied Sciences 7, no. 10: 1077.

Journal article
Published: 01 October 2017 in Applied Energy
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Reducing a building's energy consumption and providing better indoor environmental quality (IEQ) are the two major issues that building professionals are facing all over the world. It is not easy, however, to simultaneously address both issues. Therefore, this study aimed to establish the optimal occupant behavior that can simultaneously reduce total energy consumption and improve the IEQ, using an energy simulation and optimization tool. This study also developed an integrated IEQ score by combining three different IEQ indices (i.e., thermal comfort, indoor air quality (IAQ), and visual comfort) for building users to easily understand the IEQ condition. To analyze the effects of occupant behavior by region, the education facility was selected as the target facility, and five target regions were selected considering the Koppen climate classification system and the C40 Cities Climate Leadership Group. Finally, a total of 5 x 1.01 x 10(22) occupant behavior combinations can be generated in the five target regions. As a result, among the four target variables (i.e., total energy consumption, thermal comfort, IAQ and visual comfort), the total energy consumption of the optimal solution was found to have changed most dramatically compared to that of the basic condition in terms of percentage (94.7%), due to its strong correlation with the overall occupant behavior (the highest correlation coefficient: 0.879). Therefore, it is shown that occupant behavior has more influence on the total energy consumption than on the three IEQ indices. Among the three IEQ indices, the IAQ of the optimal solution decreased most significantly compared to that of the basic condition (the highest reduction ratio: 4.04% in Ulsan), which indicates that the IAQ has more influences on the integrated IEQ score than thermal and visual comfort. The facility manager and the building user can operate the building for reducing total energy consumption and improving the IEQ considering occupant behavior, which can be used as the building management guideline in various regions.Department of Building Services Engineering2016-2017 > Academic research: refereed > Publication in refereed journalbcr

ACS Style

Jimin Kim; Taehoon Hong; Jaemin Jeong; Myeonghwi Lee; Minhyun Lee; Kwangbok Jeong; Choongwan Koo; Jaewook Jeong. Establishment of an optimal occupant behavior considering the energy consumption and indoor environmental quality by region. Applied Energy 2017, 204, 1431 -1443.

AMA Style

Jimin Kim, Taehoon Hong, Jaemin Jeong, Myeonghwi Lee, Minhyun Lee, Kwangbok Jeong, Choongwan Koo, Jaewook Jeong. Establishment of an optimal occupant behavior considering the energy consumption and indoor environmental quality by region. Applied Energy. 2017; 204 ():1431-1443.

Chicago/Turabian Style

Jimin Kim; Taehoon Hong; Jaemin Jeong; Myeonghwi Lee; Minhyun Lee; Kwangbok Jeong; Choongwan Koo; Jaewook Jeong. 2017. "Establishment of an optimal occupant behavior considering the energy consumption and indoor environmental quality by region." Applied Energy 204, no. : 1431-1443.

Journal article
Published: 01 October 2017 in Energy and Buildings
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ACS Style

Kwangbok Jeong; Taehoon Hong; Myeongsoo Chae; Jimin Kim; Minhyun Lee; Choongwan Koo; Changyoon Ji. Development of the hybrid model for estimating the undisturbed ground temperature using the finite element method and geostatistical technique. Energy and Buildings 2017, 152, 162 -174.

AMA Style

Kwangbok Jeong, Taehoon Hong, Myeongsoo Chae, Jimin Kim, Minhyun Lee, Choongwan Koo, Changyoon Ji. Development of the hybrid model for estimating the undisturbed ground temperature using the finite element method and geostatistical technique. Energy and Buildings. 2017; 152 ():162-174.

Chicago/Turabian Style

Kwangbok Jeong; Taehoon Hong; Myeongsoo Chae; Jimin Kim; Minhyun Lee; Choongwan Koo; Changyoon Ji. 2017. "Development of the hybrid model for estimating the undisturbed ground temperature using the finite element method and geostatistical technique." Energy and Buildings 152, no. : 162-174.

Journal article
Published: 01 October 2017 in Building and Environment
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Psychological response based on the indoor environmental quality (IEQ) condition changes and activities of the occupants, can be assessed via indoor air quality (IAQ) satisfaction and thermal comfort. However, it is difficult to analyze both indices at the same time because they are measured on different scales. Therefore, this study aimed to develop an integrated psychological response score of the occupants based on 22 experimental participants' activities and the IEQ condition changes by using the weighted Euclidean distance. For this purpose, the experiment was designed with three scenarios to simulate the IEQ condition changes (i.e., CO2 concentration and operative temperature) during an 8-h working period. In each scenario, six cognitive tasks that simulate office work were performed to consider the activities of the occupants. A questionnaire survey on IAQ satisfaction and thermal comfort was conducted before and after (i) office work and (ii) IEQ condition changes. As a result, when the operative temperature was changed from 18.70 degrees C (cold) to 25 degrees C (neutral), the best psychological response score was calculated as 0.335. In addition, the occupants were more affected by the operative temperature than the CO2 concentration. It was shown that the mental health status based on IEQ condition, while considering both the indoor air pollutant and indoor climate, could be expressed as a single index. The mechanical system designer and facility manager can design or operate the IEQ condition considering the integrated psychological response score of the occupants, which can be used as an IEQ condition management guideline for mental health.Department of Building Services Engineering2016-2017 > Academic research: refereed > Publication in refereed journalbcr

ACS Style

Jimin Kim; Taehoon Hong; Jaemin Jeong; Choongwan Koo; Minjin Kong. An integrated psychological response score of the occupants based on their activities and the indoor environmental quality condition changes. Building and Environment 2017, 123, 66 -77.

AMA Style

Jimin Kim, Taehoon Hong, Jaemin Jeong, Choongwan Koo, Minjin Kong. An integrated psychological response score of the occupants based on their activities and the indoor environmental quality condition changes. Building and Environment. 2017; 123 ():66-77.

Chicago/Turabian Style

Jimin Kim; Taehoon Hong; Jaemin Jeong; Choongwan Koo; Minjin Kong. 2017. "An integrated psychological response score of the occupants based on their activities and the indoor environmental quality condition changes." Building and Environment 123, no. : 66-77.