• The Journal of the Korea Contents Association
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• v.19 no.4
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• pp.30-40
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• 2019

As the urban scale changes and the construction technology develops, the living space is being expanded in three dimensions. However, despite the development of construction technology represented by the appearance of skyscrapers, damage to high - rise buildings with dense population can be rather high. In order to solve such a situation, digital twin technology that can control and predict the real world in real time can be an alternative, and it is necessary to utilize pre-constructed spatial information actively. Therefore, this study aims to provide a standardized data model for using existing such information as well as various information produced in the future to the building disaster prevention field. To this end, we developed a data model that extends the CityGML standard, a representative city information model, to disaster prevention.

• Journal of the Korean Geotechnical Society
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• v.24 no.10
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• pp.105-111
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• 2008

To improve the stability of levee structure, it is required to use good quality fill materials, intensive management, appropriate hydraulic structure and construction of cut-off wall. In particular, the most important factor of levee construction technology is to use bed sediment for its safety. In this study, seepage model test and numerical analysis were performed based on a standard section of levee recommended in the river design standard of korea (2005). The results of test and analysis show that most of the bed soil is a sand (SP in USCS), which does not satisfy the permeability criteria for levee materials ($< k=10^{-3}cm/sec$), thus for the safety of levee it is required to adopt a stabilizing method such as good quality soil mixing, water content control.

• Journal of the Korean Recycled Construction Resources Institute
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• v.12 no.2
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• pp.178-187
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• 2024

In this study, it was determined that it was necessary to consider the replacement rate when applying recycled coarse aggregate to concrete, so data on existing research trends and results were collected and the mechanical properties of concrete according to the replacement rate of recycled coarse aggregate were analyzed. In collecting data on recycled coarse aggregate, data without processes such as compressive strength and removal of residual mortar attached to recycled coarse aggregate were collected among the concrete measurement items. In the case of concrete with 50 % and 100 % replacement of recycled coarse aggregate, it was confirmed that the mechanical properties were lower or higher than ordinary concrete by -36.0 ~ 9.9 % and -40.0 ~ 10.4 %, respectively, on average. Accordingly, it is judged that additional water should be mixed in consideration of the absorption rate when mixing, and the replacement rate of recycled coarse aggregate, which has mechanical properties of 80 % or more compared to ordinary concrete, should be less than 50 %.

• Journal of the Society of Disaster Information
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• v.16 no.2
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• pp.331-342
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• 2020

Purpose: This study concerns the cost of safety management in order to prevent accidents and disabilities in the construction industry. The purpose of the Chapter is to draw up problems and improvement measures for these safety management costs. Method: A detailed questionnaire was developed for 20 construction safety managers for the research. This questionnaire was analyzed and implemented by the Expert Group Interview (FGI) analysis method. Results: In order to understand the safety management cost system, alternatives such as preparing a standard manual, implementing regular on-site training, and establishing a monitoring system for the safety management cost were derived. In addition, there is a need to ensure autonomy in the execution of flexible costs so that they can be deployed immediately in case of emergency to improve the 'efficiency and necessity of the safety negligence system'. And it was analyzed as items that should be improved due to excessive demand for documentation. Conclusion: Through this study, problems should be recognized for the improvement of the construction safety management cost system. And it will have to come up with policy-based and institutional-improvement measures for experts.

• Journal of Korean Society of Disaster and Security
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• v.11 no.1
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• pp.23-30
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• 2018

The purpose of this study is to provide an integrated solution which includes construction process that allows effective tunnel grouting and to develop a tunnel grouting programme by establishing an algorithm through theoretical analysis on tunnel grouting construction technique factors. In order to verify the developed tunnel grouting procedure and the effectiveness of the programme, they are applied on certain work sites. Values after the application are Lu = 0.31 and ground-water inflow = 0.191/min where as the pre-application value of ground-water inflow is 6.691/min which is approximately 35 times larger. This shows that Tunnel grouting construction effect is significant and suggests the possibility of the application of the process and the programme on future tunnel grouting construction.

• Journal of the Society of Disaster Information
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• v.16 no.4
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• pp.723-733
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• 2020

Purpose: This study was designed to draw up problems with the safety and health diagnosis system, and designed a hierarchical survey model of the clauses prescribed by the Occupational Safety and Health Act. The purpose of the survey is to derive the effectiveness of the safety and health diagnosis system at the construction site by targeting three groups of experts. Method: This paper set up the legal status analysis and overseas related system analysis and AHP hierarchy analysis survey model. In addition, the validity of the analysis results was verified by a survey. Results: The analysis of the survey items showed a high importance on items included in the human utilization and the precision of the pre-plan. In particular, mid-sized construction companies showed the highest importance for their active activities after the safety and health diagnosis. Conclusion: Through this study, we should recognize problems for improving the safety and health system of construction industry and prepare policy and institutional improvement measures for experts.

• Journal of the Society of Disaster Information
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• v.18 no.2
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• pp.386-394
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• 2022

Purpose: This thesis is to measure construction working environment and to improve health protection of site workers, who are required to take special health check, by analyzing harmful factors that are occurred by each site operation. Method: This thesis explicates the analysis of harmful factors per the operation at construction site, the target of working environment measurement with examined harmful factors, and the variables of special health check. Result: This thesis figures out the target of working environment measurement and the variables of special health check through the analysis of harmful factors per the operation from 12 construction projects. Conclusion: This This thesis is expected to be an instrument for preventing construction site workers from occupational disease, by regular execution of measuring working environment via harmful factors of each operation as well as of special health check.

• Journal of the Society of Disaster Information
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• v.18 no.4
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• pp.769-777
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• 2022

Purpose: This study analyzes and studies the characteristics of the Jeju area and uses them as basic data such as construction method design in the future development project. Method: Based on the ground survey data of the construction conducted in Jeju, the depth, relative density, N value, function state, color tone, groundwater level, and compressive strength were analyzed and studied. Result: Studies show that Jeju has columnar joints consisting of ancient volcanic activity and rapid cooling by nearby seawater, thick sand layers found on the coast, and clinker layers and Seogwipo layers formed by Mercury volcanic activity. Conclusion: It is hoped that it will be used as data for selecting basic design and basic construction method by understanding the special ground form of Jeju area and reflecting its characteristics well when designing construction.

• The Journal of Engineering Geology
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• v.30 no.4
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• pp.617-634
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• 2020

The purpose of this study is to investigate the relationship of between earthquakes and fluctuation of water level in a groundwater well of the active-fault zone and 124 national groundwater monitoring wells in Gyeongju area. The spatial and temporal relationships between the fluctuation of water level and the earthquake were analyzed by the calculation of earthquake effectiveness (ε) and q-factor which are the function of earthquake magnitude and distance from epicenter. Two earthquake events of E1 (April 22, 2019, M 3.8) and E2 (June 11, 2019, M 2.5) show a close relationship with a post-seismic 83 cm decrease and a pre-seismic 76 cm increase in water level at the active fault zone of Dangu-ri, respectively. The spatial analysis of water level fluctuation data in National Groundwater Monitoring Networks caused by earthquake events shows a more distinct response in deep groundwater around fault zones than other area, and a greater change in deep groundwater than shallow groundwater. It's inferred that the decrease and increase in groundwater level are affected by the expansion of fractures and compression of rock mass due to seismic stress, respectively. The effective ranges of ε-value and q-factor of the monitoring well in Dangu-ri were calculated as 2.70E-10~5.60E-10 and 14.4~18.0, respectively.

• The Journal of Sustainable Design and Educational Environment Research
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• v.10 no.1
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• pp.26-33
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• 2011

The deaths caused by industrial accidents during the construction of the mortality rate is considerably higher than in other industries. To prevent such a disaster workers and to minimize unsafe behavior measures to be drawn, and construction companies recently to stimulate the emotions of the workers to participate in voluntary activities are safe. In this study, the construction workers can stimulate emotions and activities on the environment by examining the preferences of the workers on-site management will want to take advantage. This study revealed that the construction workers prefer the incentive most and then working environment.