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This study explores the combination of photovoltaic (PV) panels with a reflector mounted on a building to improve electricity generation. Globally, PV panels have been widely used as a renewable energy technology. In order to obtain more solar irradiance and improve electricity output, this study presents an advanced strategy of a reflector combining PV panels mounted on a building in Calgary, Canada. Based on an experimental database of solar irradiances, the simulation presents an optimal shape designed and tilt angles of the reflector and consequently improves solar radiation gain and electricity outputs. Polished aluminum is selected as the reflector material, and the shape and angle are designed to minimize the interruption of direct solar radiation. The numerical approach demonstrates the improvement in performance using a PV panel tilted at 30°, 45°, 60°, and 75° and a reflector, tilted at 15.5° or allowed to be tilted flexibly. A reflector tilted at 15.5° can improve solar radiation gains, of the panel, by nearly 5.5–9.2% at lower tilt angles and 14.1–21.1% at higher tilt angles. Furthermore, the flexibly adjusted reflector can improve solar radiation gains on the PV panel, by nearly 12–15.6% at lower tilt angles and 20–26.5% at higher tilt angles. A reflector tilted at 15.5° improves the panel’s output electricity on average by 4–8% with the PV panel tilted at 30° and 45° respectively and 12–19% with the PV panel tilted at 60° and 75°, annually. Moreover, a reflector that can be flexibly tilted improves electricity output on average by 9–12% with the PV panel tilted at 30° and 45° and 17–23% with the PV panel tilted at 60° and 75°. Therefore, the utilization of a reflector improves the performance of the PV panel while incurring a relatively low cost.
Moon Kim; Khalid Abdulkadir; Jiying Liu; Joon-Ho Choi; Huiqing Wen. Optimal Design Strategy of a Solar Reflector Combining Photovoltaic Panels to Improve Electricity Output: A Case Study in Calgary, Canada. Sustainability 2021, 13, 6115 .
AMA StyleMoon Kim, Khalid Abdulkadir, Jiying Liu, Joon-Ho Choi, Huiqing Wen. Optimal Design Strategy of a Solar Reflector Combining Photovoltaic Panels to Improve Electricity Output: A Case Study in Calgary, Canada. Sustainability. 2021; 13 (11):6115.
Chicago/Turabian StyleMoon Kim; Khalid Abdulkadir; Jiying Liu; Joon-Ho Choi; Huiqing Wen. 2021. "Optimal Design Strategy of a Solar Reflector Combining Photovoltaic Panels to Improve Electricity Output: A Case Study in Calgary, Canada." Sustainability 13, no. 11: 6115.
The zero-energy building (ZEB) concept has a high potential for securing energy savings in the building sector. To achieve ZEB, various active systems, including renewable systems such as photovoltaic, solar heating, and geothermal systems, have been developed. However, the existing systems are costly or not optimized. To overcome these issues, the authors previously developed an integrated tri-generation system. In this research, the previously developed system was comprehensively analyzed considering the indoor thermal comfort and energy efficiency to develop a design and operation method for the integrated system. Two different heating systems (convective heating and radiant floor heating) were employed in the tri-generation system, and their system performance, predicted mean vote (PMV), and predicted percentage of dissatisfied (PPD) were compared using simulations. The results showed that the heating coefficient of power of the radiant floor heating system was 18.8% higher than that of the convective heating system. Moreover, the radiant floor heating system (Case 4) met the PMV and PPD standards during all the heating periods. Overall, radiant floor heating was found to be more efficient than convective heating. The results confirm that radiant floor heating is more suitable than convective heating considering the indoor thermal comfort of occupants.
SangMu Bae; Yujin Nam; Joon-Ho Choi. Comparative Analysis of System Performance and Thermal Comfort for an Integrated System with PVT and GSHP Considering Two Load Systems: Convective Heating and Radiant Floor Heating. Energies 2020, 13, 5524 .
AMA StyleSangMu Bae, Yujin Nam, Joon-Ho Choi. Comparative Analysis of System Performance and Thermal Comfort for an Integrated System with PVT and GSHP Considering Two Load Systems: Convective Heating and Radiant Floor Heating. Energies. 2020; 13 (20):5524.
Chicago/Turabian StyleSangMu Bae; Yujin Nam; Joon-Ho Choi. 2020. "Comparative Analysis of System Performance and Thermal Comfort for an Integrated System with PVT and GSHP Considering Two Load Systems: Convective Heating and Radiant Floor Heating." Energies 13, no. 20: 5524.
This study investigated the adaptations of traditional dwellings to the complex regional microclimate in southern Zhejiang, China. Typical traditional dwellings in a village in the foothills and a village on the mid-slopes of Zhejiang’s alpine region were selected to study traditional construction strategies for climate responsiveness and the comfort level of indoor environments during the very humid plum rain season in early summer. Fundamental analysis of the climate and architecture, a response analysis of the dwelling form, an occupants’ comfort satisfaction survey, and field measurements of indoor and outdoor thermal environmental parameters were performed. The traditional dwellings and their design strategies for various regional environmental factors were explored from the perspective of (1) regional climate-adaptive strategies, (2) the thermal, airflow, lighting, and acoustic qualities of the indoor environment, and (3) the occupants’ indoor environment satisfaction. The results indicated that traditional dwellings in southern Zhejiang incorporate strategies of various effectiveness in ensuring indoor comfort.
Ruifeng Zheng; Yufeng Zheng; Lei Cong; Joon-Ho Choi; Hyun Jung. Climate Adaptive Design Improvement Strategies of Traditional Dwellings in Southern Zhejiang for the Plum Rain Season Considering Comfort Conditions. Energies 2020, 13, 1428 .
AMA StyleRuifeng Zheng, Yufeng Zheng, Lei Cong, Joon-Ho Choi, Hyun Jung. Climate Adaptive Design Improvement Strategies of Traditional Dwellings in Southern Zhejiang for the Plum Rain Season Considering Comfort Conditions. Energies. 2020; 13 (6):1428.
Chicago/Turabian StyleRuifeng Zheng; Yufeng Zheng; Lei Cong; Joon-Ho Choi; Hyun Jung. 2020. "Climate Adaptive Design Improvement Strategies of Traditional Dwellings in Southern Zhejiang for the Plum Rain Season Considering Comfort Conditions." Energies 13, no. 6: 1428.
The quality and controllability of the building façade can significantly contribute to building indoor environmental quality (IEQ) as well as the building’s energy efficiency. Advanced technologies that support a façade’s dynamic response to climatic changes, such as electrochromic (dynamic) glazing, have emerged as smart systems for IEQ and environmental sustainability. This research summarizes a four-season study of office workers moving from a floor with conventional blinds to work environments equipped with smart dynamic glazing which changes tint in response to weather condition to control daylighting levels. Multiple occupant environmental satisfaction surveys were conducted over one year to investigate differences in environmental and psychological responses to office settings with manual, and often static, facades as compared to offices with dynamic glazing. This research confirms that dynamic glazing significantly affected occupants’ environmental satisfaction—enhancing individuals’ environmental perceptions and psychological health—as compared to manual blinds. It reveals that the occupants in work environments with dynamic glazing reported 21.7% higher productivity gains, 24.8% increased ability to relax, 12.7% improved concentration, 25.3% better moods and 29.4% greater alertness than when they were in offices in the same building with manual shading devices. Also, the dynamic feature of the smart glazing showed a significant contribution to perceived work productivity while enhancing positive emotional responses by an average of 26%.
Joon-Ho Choi; Vivian Loftness; Danny Nou; Brandon Tinianov; Dongwoo Yeom. Multi-Season Assessment of Occupant Responses to Manual Shading and Dynamic Glass in a Workplace Environment. Energies 2019, 13, 60 .
AMA StyleJoon-Ho Choi, Vivian Loftness, Danny Nou, Brandon Tinianov, Dongwoo Yeom. Multi-Season Assessment of Occupant Responses to Manual Shading and Dynamic Glass in a Workplace Environment. Energies. 2019; 13 (1):60.
Chicago/Turabian StyleJoon-Ho Choi; Vivian Loftness; Danny Nou; Brandon Tinianov; Dongwoo Yeom. 2019. "Multi-Season Assessment of Occupant Responses to Manual Shading and Dynamic Glass in a Workplace Environment." Energies 13, no. 1: 60.
Predicting thermal comfort is one of the primary building research domains due to its technical and environmental significance. A metabolic rate, one of the significant variables for predicting an individual's thermal comfort, is primarily based on the human body's activity level. While other human and environmental factors, such as air temperature and relative humidity are easily measured and collected, with the help of sensory devices, a metabolic rate varies with time, and is not easy to measure to determine an accurate thermal comfort estimation in reality. Therefore, this study investigated the potential use of Deep Learning algorithm to accurately estimate the metabolic rate for a better thermal comfort estimation. A series of chamber tests were conducted with 23 test participants. The Kinect sensor was adopted to detect a user's physical motion, by capturing the motion images. With the help of a wearable sensor, a user's heart rate was also measured to estimate a metabolic rate. This study found that males showed higher MET than females, and the high BMI group generated higher MET than the low BMI group. The result also indicated that an estimated accurate range of 77%–89% was reasonably acceptable in the self-MET prediction modeling, while it was 65% in the third-party MET prediction. Therefore, the outcome of this research confirms that it is possible to use the Kinect sensor as a remote sensing device to estimate a user's metabolic rate, based on the use of a Deep Learning algorithm developed per individual.
Hooseung Na; Joon-Ho Choi; Hoseong Kim; Taeyeon Kim. Development of a human metabolic rate prediction model based on the use of Kinect-camera generated visual data-driven approaches. Building and Environment 2019, 160, 106216 .
AMA StyleHooseung Na, Joon-Ho Choi, Hoseong Kim, Taeyeon Kim. Development of a human metabolic rate prediction model based on the use of Kinect-camera generated visual data-driven approaches. Building and Environment. 2019; 160 ():106216.
Chicago/Turabian StyleHooseung Na; Joon-Ho Choi; Hoseong Kim; Taeyeon Kim. 2019. "Development of a human metabolic rate prediction model based on the use of Kinect-camera generated visual data-driven approaches." Building and Environment 160, no. : 106216.
The goal of this research is to investigate and determine whether the effect of an IVE condition on an occupant's environmental sensations and physiological responses is different from the effect of a real environmental condition in the indoor environment. The research included a series of human subject experiments, with 16 participants in an environmental chamber. A thermal quality condition was selected as a primary environmental parameter, based on current IEQ-relevant studies. While the ambient thermal condition was gradually changed from 20 °C to 30 °C, the participants were asked to report their overall thermal sensations. Their skin temperatures were also continuously measured to collect physiological signal information in real time. The results of this experimental study revealed that the participants mostly generated higher skin temperature at the selected seven skin areas. Their reported thermal sensations were significantly higher in the IVE condition, than in the real environment, showing a difference of 12%.
Dongwoo Yeom; Joon-Ho Choi; Sin-Hwa Kang. Investigation of the physiological differences in the immersive virtual reality environment and real indoor environment: Focused on skin temperature and thermal sensation. Building and Environment 2019, 154, 44 -54.
AMA StyleDongwoo Yeom, Joon-Ho Choi, Sin-Hwa Kang. Investigation of the physiological differences in the immersive virtual reality environment and real indoor environment: Focused on skin temperature and thermal sensation. Building and Environment. 2019; 154 ():44-54.
Chicago/Turabian StyleDongwoo Yeom; Joon-Ho Choi; Sin-Hwa Kang. 2019. "Investigation of the physiological differences in the immersive virtual reality environment and real indoor environment: Focused on skin temperature and thermal sensation." Building and Environment 154, no. : 44-54.
Adaptive kinetic architecture has emerged from a need for innovative designs that adapt to the environment and changing needs of the occupants. Architectural design and modes of egress are critical in an emergency. Flocking describes a certain collective behavior where agents are brought together in groups and move as a cohesive unit from place to place. Collective behavior may be observed in microscopic as well as macroscopic environments. Crowd modeling incorporates the study of human behavior, mathematical modeling, and molecular or fluid dynamics. The simulation of agents and their movement in the built environment is beneficial for design professionals, scientists, and engineers. Human behavior in panic situations is notably similar to fluids and molecules. The objective of this research was to evaluate the movement of agents in buildings using discrete dynamic simulation. We used a novel discrete molecular dynamics technique to simulate the evacuation of agents in panic situations. Various adaptive geometric configurations were analyzed for improved crowd flow. Kinetic walls were modeled in order to evaluate design optimization as it relates to rates of egression. This research proposes the use of kinetic walls to improve safety and efficiency during an emergency evacuation. Adaptive geometric configurations show improvements over the conventional design framework.
Angella Johnson; Size Zheng; Aiichiro Nakano; Goetz Schierle; Joon-Ho Choi. Adaptive Kinetic Architecture and Collective Behavior: A Dynamic Analysis for Emergency Evacuation. Buildings 2019, 9, 44 .
AMA StyleAngella Johnson, Size Zheng, Aiichiro Nakano, Goetz Schierle, Joon-Ho Choi. Adaptive Kinetic Architecture and Collective Behavior: A Dynamic Analysis for Emergency Evacuation. Buildings. 2019; 9 (2):44.
Chicago/Turabian StyleAngella Johnson; Size Zheng; Aiichiro Nakano; Goetz Schierle; Joon-Ho Choi. 2019. "Adaptive Kinetic Architecture and Collective Behavior: A Dynamic Analysis for Emergency Evacuation." Buildings 9, no. 2: 44.
The purpose of this study is to investigate and determine the relationship between occupants’ thermal satisfaction and physiological responses in an office environment, and to estimate their thermal satisfaction level via human physiological signals. This study adapted the heart rate and seven local body skin temperatures as physiological signals, as well as human factors (gender, age, BMI), to determine establish a thermal satisfaction prediction model by combining human factors and physiological signals. The results revealed significant correlations between overall thermal satisfaction levels and local body skin temperatures, as well as heart rates. The heart rates showed a negative correlation with overall thermal satisfaction, and the skin temperature of the forehead, arm, wrist (back and front), chest, and belly also revealed a significant correlation with the thermal satisfaction levels of the study participants. This study also determined the order and priority of local skin temperatures (as well as gender and BMI) by their impact on thermal satisfaction. Considering all human physiological factors and practical application of the results, the local skin temperatures of the forehead, wrist (back), and gender demonstrated 88.52% accuracy for estimating thermal satisfaction, which provided significant validation for practical use of this procedure.
Joon-Ho Choi; Dongwoo Yeom. Development of the data-driven thermal satisfaction prediction model as a function of human physiological responses in a built environment. Building and Environment 2019, 150, 206 -218.
AMA StyleJoon-Ho Choi, Dongwoo Yeom. Development of the data-driven thermal satisfaction prediction model as a function of human physiological responses in a built environment. Building and Environment. 2019; 150 ():206-218.
Chicago/Turabian StyleJoon-Ho Choi; Dongwoo Yeom. 2019. "Development of the data-driven thermal satisfaction prediction model as a function of human physiological responses in a built environment." Building and Environment 150, no. : 206-218.
Post-Occupancy Evaluation (POE), as an architectural and technical tool, has been researched for decades to support an effective design decision process and also for indoor environmental quality control, such as thermal, air, lighting, and acoustic quality, as well as spatial quality. However, a one-time data collection has been frequently adopted that includes survey and field measurements, even though these data acquisition approaches have been moderately changed and revised. For modern office buildings, where a large number of time-varying architectural and environmental parameters are available, and the demands of individual occupants for specific environmental conditions vary per season, day, or even hour, little research effort has been made to validate whether the one-time data collection-based POE is still effective in a modern structure. To address this challenge, this research project included four different POE studies in two commercial office buildings, in Southern California in the U.S. At 189 individual workstations, selected in two buildings, an environmental satisfaction survey and spot measurements were repeatedly made during 4 seasons while considering seasonal and daily factors. This study found that human factors, such as gender and age, contributed to inconsistent environmental perceptions, depending on the season and/or month. This research revealed that multiple-time data collection is required to provide a vigorous environmental design solution which would enhance building occupants' environmental comfort, while considering time-varying environmental factors, such as a season.
Joon-Ho Choi; Kyeongsuk Lee. Investigation of the feasibility of POE methodology for a modern commercial office building. Building and Environment 2018, 143, 591 -604.
AMA StyleJoon-Ho Choi, Kyeongsuk Lee. Investigation of the feasibility of POE methodology for a modern commercial office building. Building and Environment. 2018; 143 ():591-604.
Chicago/Turabian StyleJoon-Ho Choi; Kyeongsuk Lee. 2018. "Investigation of the feasibility of POE methodology for a modern commercial office building." Building and Environment 143, no. : 591-604.
Recognizing the value of open-source research databases in advancing the art and science of HVAC, in 2014 the ASHRAE Global Thermal Comfort Database II project was launched under the leadership of University of California at Berkeley's Center for the Built Environment and The University of Sydney's Indoor Environmental Quality (IEQ) Laboratory. The exercise began with a systematic collection and harmonization of raw data from the last two decades of thermal comfort field studies around the world. The ASHRAE Global Thermal Comfort Database II (Comfort Database), now an online, open-source database, includes approximately 81,846 complete sets of objective indoor climatic observations with accompanying “right-here-right-now” subjective evaluations by the building occupants who were exposed to them. The database is intended to support diverse inquiries about thermal comfort in field settings. A simple web-based interface to the database enables filtering on multiple criteria, including building typology, occupancy type, subjects' demographic variables, subjective thermal comfort states, indoor thermal environmental criteria, calculated comfort indices, environmental control criteria and outdoor meteorological information. Furthermore, a web-based interactive thermal comfort visualization tool has been developed that allows end-users to quickly and interactively explore the data.
Veronika Földváry Ličina; Toby Cheung; Hui Zhang; Richard de Dear; Thomas Parkinson; Edward Arens; Chungyoon Chun; Stefano Schiavon; Maohui Luo; Gail Brager; Peixian Li; Soazig Kaam; Michael A. Adebamowo; Mary Myla Andamon; Francesco Babich; Chiheb Bouden; Hana Bukovianska; Christhina Candido; Bin Cao; Salvatore Carlucci; David K.W. Cheong; Joon-Ho Choi; Malcolm Cook; Paul Cropper; Max Deuble; Shahin Heidari; Madhavi Indraganti; Quan Jin; Hyojin Kim; Jungsoo Kim; Kyle Konis; Manoj K. Singh; Alison Kwok; Roberto Lamberts; Dennis Loveday; Jared Langevin; Sanyogita Manu; Cornelia Moosmann; Fergus Nicol; Ryozo Ooka; Nigel A. Oseland; Lorenzo Pagliano; Dušan Petráš; Rajan Rawal; Ramona Romero; Hom Bahadur Rijal; Chandra Sekhar; Marcel Schweiker; Federico Tartarini; Shin-Ichi Tanabe; Kwok Wai Tham; Despoina Teli; Jorn Toftum; Linda Toledo; Kazuyo Tsuzuki; Renata De Vecchi; Andreas Wagner; Zhaojun Wang; Holger Wallbaum; Lynda Webb; Liu Yang; Yingxin Zhu; Yongchao Zhai; Yufeng Zhang; Xiang Zhou. Development of the ASHRAE Global Thermal Comfort Database II. Building and Environment 2018, 142, 502 -512.
AMA StyleVeronika Földváry Ličina, Toby Cheung, Hui Zhang, Richard de Dear, Thomas Parkinson, Edward Arens, Chungyoon Chun, Stefano Schiavon, Maohui Luo, Gail Brager, Peixian Li, Soazig Kaam, Michael A. Adebamowo, Mary Myla Andamon, Francesco Babich, Chiheb Bouden, Hana Bukovianska, Christhina Candido, Bin Cao, Salvatore Carlucci, David K.W. Cheong, Joon-Ho Choi, Malcolm Cook, Paul Cropper, Max Deuble, Shahin Heidari, Madhavi Indraganti, Quan Jin, Hyojin Kim, Jungsoo Kim, Kyle Konis, Manoj K. Singh, Alison Kwok, Roberto Lamberts, Dennis Loveday, Jared Langevin, Sanyogita Manu, Cornelia Moosmann, Fergus Nicol, Ryozo Ooka, Nigel A. Oseland, Lorenzo Pagliano, Dušan Petráš, Rajan Rawal, Ramona Romero, Hom Bahadur Rijal, Chandra Sekhar, Marcel Schweiker, Federico Tartarini, Shin-Ichi Tanabe, Kwok Wai Tham, Despoina Teli, Jorn Toftum, Linda Toledo, Kazuyo Tsuzuki, Renata De Vecchi, Andreas Wagner, Zhaojun Wang, Holger Wallbaum, Lynda Webb, Liu Yang, Yingxin Zhu, Yongchao Zhai, Yufeng Zhang, Xiang Zhou. Development of the ASHRAE Global Thermal Comfort Database II. Building and Environment. 2018; 142 ():502-512.
Chicago/Turabian StyleVeronika Földváry Ličina; Toby Cheung; Hui Zhang; Richard de Dear; Thomas Parkinson; Edward Arens; Chungyoon Chun; Stefano Schiavon; Maohui Luo; Gail Brager; Peixian Li; Soazig Kaam; Michael A. Adebamowo; Mary Myla Andamon; Francesco Babich; Chiheb Bouden; Hana Bukovianska; Christhina Candido; Bin Cao; Salvatore Carlucci; David K.W. Cheong; Joon-Ho Choi; Malcolm Cook; Paul Cropper; Max Deuble; Shahin Heidari; Madhavi Indraganti; Quan Jin; Hyojin Kim; Jungsoo Kim; Kyle Konis; Manoj K. Singh; Alison Kwok; Roberto Lamberts; Dennis Loveday; Jared Langevin; Sanyogita Manu; Cornelia Moosmann; Fergus Nicol; Ryozo Ooka; Nigel A. Oseland; Lorenzo Pagliano; Dušan Petráš; Rajan Rawal; Ramona Romero; Hom Bahadur Rijal; Chandra Sekhar; Marcel Schweiker; Federico Tartarini; Shin-Ichi Tanabe; Kwok Wai Tham; Despoina Teli; Jorn Toftum; Linda Toledo; Kazuyo Tsuzuki; Renata De Vecchi; Andreas Wagner; Zhaojun Wang; Holger Wallbaum; Lynda Webb; Liu Yang; Yingxin Zhu; Yongchao Zhai; Yufeng Zhang; Xiang Zhou. 2018. "Development of the ASHRAE Global Thermal Comfort Database II." Building and Environment 142, no. : 502-512.
In the domain of building science and architectural design, the immersive virtual environment is being commonly adopted due to its convenience and cost-effectiveness, especially for research relevant to occupant behaviour in a building indoor environmental control. The goal of this study is to investigate whether such an immersive virtual environment condition could affect an occupant's thermal sensation and physiological response to ambient conditions differently, as compared to a real indoor environment, even though those two thermal conditions are the same or very similar. A series of human subject experiments using 18 participants was conducted in an environmental chamber. While thermal conditions were controlled at 20℃ to 30℃ in each environment, respectively, participants were asked to periodically report their thermal sensations on their body. Their heart rates were also continuously measured. The result of our experiments revealed that overall thermal sensations on the whole and local body areas showed some significant differences between the indoor environment and immersive virtual environment conditions during the same thermal conditions. Also, the heart rate difference between two environmental conditions was statistically significant at every thermal sensation level. These findings support the idea that significant physiological response differences could be affected by the immersive virtual environment condition.
Dongwoo Yeom; Joon-Ho Choi; Yimin Zhu. Investigation of physiological differences between immersive virtual environment and indoor environment in a building. Indoor and Built Environment 2017, 28, 46 -62.
AMA StyleDongwoo Yeom, Joon-Ho Choi, Yimin Zhu. Investigation of physiological differences between immersive virtual environment and indoor environment in a building. Indoor and Built Environment. 2017; 28 (1):46-62.
Chicago/Turabian StyleDongwoo Yeom; Joon-Ho Choi; Yimin Zhu. 2017. "Investigation of physiological differences between immersive virtual environment and indoor environment in a building." Indoor and Built Environment 28, no. 1: 46-62.
In spite of prolific research on the energy performance of buildings in the last decades, and the growing focus on reducing their operational energy, buildings still prevail as the main end users of energy in the U.S. The goal of this research is to investigate the potential use of building facade information to estimate its energy performance, and to find significant facade attributes depending on different climate conditions in the U.S. This study adopted Energy Use Intensity (EUI) for total consumption and described building information, including window-wall ratio, orientation, aspect ratio, and other building components. Concentration was given to achieve a balanced data collection from best practices and green certified non-residential projects located in different climate conditions in the U.S. Data mining techniques, such as classification tree and statistical tools that included Analysis of Variance (ANOVA), a 2-sample t-test, and regression, were adopted for analysis of this group of buildings. It was found that there were common functional and technical features, as well as similar performances of existing buildings linked to these buildings’ energy consumption. These findings could not only inform the new design of facades, but facade retrofits could be strategically established based on lessons learned from real practice.
Andrea Martinez; Joon-Ho Choi. Exploring the potential use of building facade information to estimate energy performance. Sustainable Cities and Society 2017, 35, 511 -521.
AMA StyleAndrea Martinez, Joon-Ho Choi. Exploring the potential use of building facade information to estimate energy performance. Sustainable Cities and Society. 2017; 35 ():511-521.
Chicago/Turabian StyleAndrea Martinez; Joon-Ho Choi. 2017. "Exploring the potential use of building facade information to estimate energy performance." Sustainable Cities and Society 35, no. : 511-521.
Joon-Ho Choi; Dongwoo Yeom. Investigation of the relationships between thermal sensations of local body areas and the whole body in an indoor built environment. Energy and Buildings 2017, 149, 204 -215.
AMA StyleJoon-Ho Choi, Dongwoo Yeom. Investigation of the relationships between thermal sensations of local body areas and the whole body in an indoor built environment. Energy and Buildings. 2017; 149 ():204-215.
Chicago/Turabian StyleJoon-Ho Choi; Dongwoo Yeom. 2017. "Investigation of the relationships between thermal sensations of local body areas and the whole body in an indoor built environment." Energy and Buildings 149, no. : 204-215.
Joon-Ho Choi; Dongwoo Yeom. Study of data-driven thermal sensation prediction model as a function of local body skin temperatures in a built environment. Building and Environment 2017, 121, 130 -147.
AMA StyleJoon-Ho Choi, Dongwoo Yeom. Study of data-driven thermal sensation prediction model as a function of local body skin temperatures in a built environment. Building and Environment. 2017; 121 ():130-147.
Chicago/Turabian StyleJoon-Ho Choi; Dongwoo Yeom. 2017. "Study of data-driven thermal sensation prediction model as a function of local body skin temperatures in a built environment." Building and Environment 121, no. : 130-147.
Joon-Ho Choi. Investigation of the correlation of building energy use intensity estimated by six building performance simulation tools. Energy and Buildings 2017, 147, 14 -26.
AMA StyleJoon-Ho Choi. Investigation of the correlation of building energy use intensity estimated by six building performance simulation tools. Energy and Buildings. 2017; 147 ():14-26.
Chicago/Turabian StyleJoon-Ho Choi. 2017. "Investigation of the correlation of building energy use intensity estimated by six building performance simulation tools." Energy and Buildings 147, no. : 14-26.
Joon-Ho Choi; Jehyun Moon. Impacts of human and spatial factors on user satisfaction in office environments. Building and Environment 2017, 114, 23 -35.
AMA StyleJoon-Ho Choi, Jehyun Moon. Impacts of human and spatial factors on user satisfaction in office environments. Building and Environment. 2017; 114 ():23-35.
Chicago/Turabian StyleJoon-Ho Choi; Jehyun Moon. 2017. "Impacts of human and spatial factors on user satisfaction in office environments." Building and Environment 114, no. : 23-35.
Joon-Ho Choi; Rui Zhu. Investigation of the potential use of human eye pupil sizes to estimate visual sensations in the workplace environment. Building and Environment 2015, 88, 73 -81.
AMA StyleJoon-Ho Choi, Rui Zhu. Investigation of the potential use of human eye pupil sizes to estimate visual sensations in the workplace environment. Building and Environment. 2015; 88 ():73-81.
Chicago/Turabian StyleJoon-Ho Choi; Rui Zhu. 2015. "Investigation of the potential use of human eye pupil sizes to estimate visual sensations in the workplace environment." Building and Environment 88, no. : 73-81.
In this study, the experimental specimens composed by the extra-high tensile strength concrete called as ESCON and the high yield strength steels called as USD685 were prepared to clarify the seismic performance of the ultra high strength fiber RC columns under cyclic bending loading. Compared to the experimental results of normal strength RC columns, the yielding capacity and the maximum capacity of the high strength one were improved. In addition, the crack distributions and the failure modes were different by the polyvinyl alcohol fiber contained in ESCON. Moreover, the trace analyses using the Finite Element Method (FEM) of these experiments of RC columns were conducted. As a result, it was identified that the experimental hysteresis curves could be traced by FEA. Lastly, it was calculated that how much cross section with equivalent strength of the normal strength specimen by using ESCON and USD685 could be reduced. The calculations showed that the cross section of area of RC columns using these high strength materials could be reduced by about 40% of normal one.
Masahiro Hattori; Tadaaki Nozawa; Yoshiki Hamaguchi; Joon-Ho Choi; Hisanori Otsuka. Application of Ultra Strength Fiber Reinforced Concrete to Bridge Piers. IABSE Conference, Nara 2015: Elegance in structures 2015, 1 .
AMA StyleMasahiro Hattori, Tadaaki Nozawa, Yoshiki Hamaguchi, Joon-Ho Choi, Hisanori Otsuka. Application of Ultra Strength Fiber Reinforced Concrete to Bridge Piers. IABSE Conference, Nara 2015: Elegance in structures. 2015; ():1.
Chicago/Turabian StyleMasahiro Hattori; Tadaaki Nozawa; Yoshiki Hamaguchi; Joon-Ho Choi; Hisanori Otsuka. 2015. "Application of Ultra Strength Fiber Reinforced Concrete to Bridge Piers." IABSE Conference, Nara 2015: Elegance in structures , no. : 1.
In this study, in order to clarify the influence of connection part modelling method of dissipation device installed in oblique direction on an I-girder bridge, case studies using time series analysis with material nonlinearity were conducted. Here in, fixed connected models and pin connected models in between dissipation devices and bridge members were analysed respectively in a few models varied with the installing angle of dissipation device. The parametric analyses were conducted by inputting single earthquake wave in longitudinal direction and vertical direction respectively. From the time series analyses, it was identified that the connection parts modelling of dissipation device contribute little to the response of the dissipation device and it has the influence on the vertical and longitudinal displacement at girder.
Joon-Ho Choi; Koichi Hozoji; Hitoshi Yatsumoto. Analytical Study on Connection Part Modelling Method of Dissipation Device Installed in Oblique Direction on I-Girder Bridge. IABSE Symposium, Madrid 2014: Engineering for Progress, Nature and People 2014, 1 .
AMA StyleJoon-Ho Choi, Koichi Hozoji, Hitoshi Yatsumoto. Analytical Study on Connection Part Modelling Method of Dissipation Device Installed in Oblique Direction on I-Girder Bridge. IABSE Symposium, Madrid 2014: Engineering for Progress, Nature and People. 2014; ():1.
Chicago/Turabian StyleJoon-Ho Choi; Koichi Hozoji; Hitoshi Yatsumoto. 2014. "Analytical Study on Connection Part Modelling Method of Dissipation Device Installed in Oblique Direction on I-Girder Bridge." IABSE Symposium, Madrid 2014: Engineering for Progress, Nature and People , no. : 1.