• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.164-165
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• 2015

Modular construction technique is an adaptation of factory-based mass production concept in ordinary manufacturing industries to construction industry and it assumes that panels, units, etc. are fabricated in factories and assembled in construction sites. Given its structural limitations, modular construction technique is primarily used in low-story buildings whose maximum height is usually five stories, but researchers are actively studying possible adaptation of modular construction technique to high-rise building designs these days as in the case of infill-type modular construction design. Infill-type modular construction technique, most frequently used in high-rise building construction projects, completes frame construction first in reinforced concrete structures and fills unit modules in such structures. However, infill-type modular construction technique leads to longer construction schedule accompanying increase in construction cost, cost overrun due to additional of temporary work, and possible damage to units in the wake of facility construction. Accordingly, this study is performed as a basic study for the development of bottom-up infill-type modular construction technique intended to construct structural frames and fill in units sequentially in a bid to address such drawbacks of current infill-type modular construction technique.

• Fire Science and Engineering
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• v.24 no.4
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• pp.27-32
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• 2010

Recently, increases of population density due to the industrialization in the metropolitan cities has caused the high-density and integration of life environment. Then various high-rise buildings are constructed for accommodation. However, high-rise building fires can cause high casualties due to increases of smoke spread velocity through the vertical shaft. In this study, the new program based on the enthalpy conservation for analysis of energy transfer for smoke control system, CAU_ESCAP, was developed. CAU_ESCAP was validated by comparing with the result of ASCOS. The characteristic of smoke control was analysed by using CAU_ESCAP for high-rise building fires.

• Journal of the Korean Society of Safety
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• v.26 no.4
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• pp.102-110
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• 2011

For decreasing of the casualties and designing of the smoke control systems in the ultra high-rise building, the programs for analysis of smoke control were developed for prediction of smoke spread and distributions of pressure and temperature in building fire situation. In this study, coupling algorithm between mass and enthalpy conservations was modified for improving the applicability of the CAU_ESCAP which program can consider the energy transfer. The fire situation in ultra high-rise building was applied by using the modified CAU_ESCAP. Results of pressure difference predicted by modified CAU_ESCAP are higher than results of ASCOS as stack effect is generated due to the increasing of stairway temperature. Moreover, theoretically, the result of the neutral plane is more accurate than the result of ASCOS, in fire situation of ultra high-rise building.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.29 no.2
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• pp.59-66
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• 2013

This is a fundamental study for safety management for high-rise building towercrane operators. There has been lots of studies related to the towercrane concentrating on the automation, system and equipment development and its implementation. The current studies strengthens only the limited domain of instrumental rationality and technical efficiency and the basic concepts of human resouce management seem to be strangely ignored. Thus, this study is based on the hypothesis that the construction workers, especially towercrane operators, should experience more difficulties doing their job on high-rise building job conditions than doing on general building job conditions related to the climate, physiological and psychological elements. This study focuses on the survey and analyisis of towercrane operators' current work condition to establish the frame of the further research. The study tried to find out major problems to make the further safety guidelines for the high-rise buidling towrecrane operators. This study is anticipated to provide basic data-based processing the research on safety management for high-rise building construction workers.

• International Journal of High-Rise Buildings
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• v.1 no.3
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• pp.169-179
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• 2012

The development history, the current situation and the future of the performance-based seismic design of building structures in China are presented in this paper. Firstly, the evolution of performance-based seismic design of building structures specified in the Chinese codes for seismic design of buildings of the edition 1974, 1978, 1989, 2001 and 2010 are introduced and compared. Secondly, in two parts, this paper details the provisions of performance-based seismic design in different Chinese codes. The first part is about the "Code for Seismic Design of Buildings" (GB50011) (edition 1989, 2001 and 2010) and "Technical Specification for Concrete Structures of Tall Building", which presents the concepts and methods of performance-based seismic design adopted in Chinese codes; The second part is about "Management Provisions for Seismic Design of Outof-codes High-rise Building Structures" and "Guidelines for Seismic Design of Out-of-codes High-rise Building Structures", which concludes the performance-based seismic design requirements for high-rise building structures over the relevant codes in China. Finally, according to those mentioned above, this paper pointed out the imperfections of current performance-based seismic design in China and proposed the possible direction for further improvement.

• 한국태양에너지학회:학술대회논문집
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• 2012.03a
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• pp.345-353
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• 2012

Recently rapid urbanization facilitates development of high-rise building complex including apartment and office building in urban area. Many problems related with high-rise building are reported. Especially, unpleasant strong winds in pedestrian area are frequently encountered around the high-rise building. CFD simulation methods are used to analyze the wind environment of pedestrian level in high-rise building block. However the results show differences between CFD and measurement. The reason for the difference is that conventional CFD simulation couldn't consider the effect of trees, shrubs and plants which affect the wind environment. Canopy model is a solution to solve the limitation of CFD analysis. In this paper, the canopy model to predict wind environment of pedestrian level by CFD simulation will be proposed and the validity will be analyzed by comparison of measurement and CFD prediction.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.30 no.9
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• pp.69-78
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• 2014

Tact scheduling is accepted as an efficient method that can reduce idle times during construction. To achieve an optimized tact system, various conditions should be satisfied. Many existing studies addressed various aspects related to applying tact system on construction job-site, including 1) crew balancing by working site rotation in a condominium construction with multiple buildings, 2) the tact system involved in synchronizing a single type of crew on finishing work, and 3) the development of a scheduling model of structural framing construction by working space zoning in a high-rise building. However, no existing studies attempt to apply the tact scheduling method to the structural framing construction for the single building having multiple units. Therefore, this study develops the optimization model and presents its application, which can schedule the tact system for a high-rise building. It is concluded that the proposed method can efficiently optimize the tact scheduling in case of multi-crew to milti-process model.

• Journal of Environmental Impact Assessment
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• v.19 no.6
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• pp.583-590
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• 2010

To determine nocturnal inversion characteristics at the leeward side of high-rise building, air temperature data were observed at 10 minute interval from February 22, 2010 to April 15, 2010. The observed data were compared, analyzed and examined to illustrate air temperature differences between the roof (XAR) and surface (XAG) of X apartment. The wind speed, wind direction and precipitation data were also observed at XAR and YJL (Yangjae Stream) sites at the same time. After the analysis, the maximum nocturnal inversion was observed by $4.0^{\circ}C$ at 3:40, 3:50, 4:10 on February 24th 2010, at that time the weather condition was clear and weak wind. Air temperature inversions at the leeward side of high-rise building were observed on whole day in wintertime and air temperature inversion intensity was also higher than other nearby area (SMG).

• Journal of the Korean Society of Industry Convergence
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• v.23 no.2_2
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• pp.271-280
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• 2020

Due to the development of the urban economy, high-density buildings and skyscrapers have continued to increase in order to alleviate high population densities and to make efficient use of urban space. However, a fire in a high-rise building is a disaster that can lead to massive casualties and property damage because of the difficulty of firefighting and escaping. Various studies have been conducted on these high-rise buildings because they are sympathetic to these difficulties all over the world. In this paper, trends of researches and technologies related to fire in high-rise buildings are analyzed synthetically through thesis and patent data. In other words, we explored the trends of various studies that have been carried out so far through the thesis, and performed technical monitoring on actual implemented technology and newly implemented technologies through patent data. Through this research, we have studied the present and the future of technology for high-rise building fire.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.29 no.3
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• pp.285-292
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• 2013

This study approaches a new way to determine a correction coefficient for calculation of occupant's vertical travel speed in a high-rise building when a fire protection engineer uses Simulex, one of the most widely used egress model in Korea. It is used to analyse human evacuation behaviours and travel times. In case of a high-rise building fire, occupant's vertical travelling up and down speeds tend to be distributed wider than low-rise buildings due to one's fatigue. It is needless to say that occupant's travel speeds have to be calculated extremely precise, especially evacuee going up through staircases to reach a refuge area located within every 30 floors or top floor. However, most correction coefficients of egress models for calculating occupant's vertical travel speed are usually from one's free walking speed but this can bring about significant errors. To summarise, this study compares occupant's vertical walking speed from a full-scale experiment with a result from Simulex modelling and suggests a new correction coefficient based on free walking speed for predicting the time more accurately.