• Spatial Information Research
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• v.11 no.4
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• pp.371-389
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• 2003

This study aims at defining the concept of a cyber-geospace and proposing how to establish a cyber-geospace fir the entire country in detail. The study defined the cyber-geospace as 'the dynamic second territory of Korea not only to manage the land systematicality and deal with administrative services for the people in aspect of public sector, but also to contain economic activities of corporations and the citizen's everyday lives in aspect of private sector, in a 3D virtual reality made by digitizing various facilities and buildings as well as the entire toterritory including ground, underground and even sea'. In order to establish such a cyber-geospace, the project should be pursued on the national level fir around ten-year period.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.03a
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• pp.359-365
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• 2008

As housing supply ratio has become over 100%, the strategic vision of government's policies has been changed from new construction to maintenance and regeneration of old architectural-structures. This fact has brought a light on the reconstruction and remodeling industries and a need for retrofit and rehabilitation techniques of existing foundation. Various methods of foundation for architectural-structures do exist. Among them, micropiling technologies are increasingly applied in foundation rehabilitation and seismic retrofitting projects. Micropiling techniques provide environmental-friendly methods for minimizing disturbance to adjacent structures, ground, and the environment. The installation is possible in restrictive area and general ground conditions. The fact that the installation procedures cause minimal vibration and noise and require very low ceiling height makes the micropiling methods to be commonly used for underpin existing structures. Specialized drilling equipment is often required to install the micropiles for existing basement facilities. This paper presents a case study in which micropiles were constructed to support a superstructure for vertical extension of existing elevator core and provide accessibility to underground parking lot. It is intended to become useful reference for the similar remodeling project.

• Korean Journal of Construction Engineering and Management
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• v.11 no.5
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• pp.24-31
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• 2010

Today many people live in various risks due to rapid industrialization. High-rise buildings and underground facilities are increasing in the heart of the city. It probably would be developed into a gigantic disasters complicated with sudden climate change. To effectively cope with these disasters, National Emergency Management Agency was set up, but it has been pointed that the Agency's role is limited to treat the problems. Therefore, emergency management system and disaster case study were reviewed and analyzed. And a Proposals for Improvement of the National Emergency Management System based on Past Disaster Cases was suggested in this paper.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.673-679
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• 2005

Urban conditions such as underground facilities and ambient noises due to cultural activity restrict the application of conventional geophysical techniques in general. We used the linear array microtremor technique which uses these noises as strong energy source. The result parameter of the survey is shear wave velocity profile which had been applied as an fundamental information for the determination of the rock support type in tunnel design. This study was the first case in Korea which utilized a surface geophysical technique yielding successful result in urban area especially under the existing rail ways. The quantitative relation between the shear wave velocity from this method and the rock mass rating(RMR) determined from the inspection of the cores recovered from the same boreholes showed high statistical relationship. These correlations were then used to relate the shear-wave velocity to RMR along the entire profile.

• Tunnel and Underground Space
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• v.25 no.1
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• pp.37-45
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• 2015

Recently, many cities have always been affected by large natural disasters such as floods and landslides. As climate change causes more frequent localized heavy rains exceeding the conveyance capacity of sewer, flood damage is expected to increase. For the sake of reducing the urban flood damage by changed rainfall, there has been many trials on installation of runoff-reducing facilities. Therefore, it was required to study about reasonable analysis and countermeasure of rainwater storage facility project for extending it. This study was to review the status of rainwater storage facility project for the urban disaster prevention in Busan, to find out problems, and to propose the countermeasure of rainwater storage facility project for the urban disaster prevention.

• Proceedings of the Korean Geotechical Society Conference
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• 2001.03a
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• pp.249-256
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• 2001

Optical Color Corescanner firstly developed by DMT-GeoTec, Germany and further upgraded through the Korea-Germany joint project is capable of duplicating the core surfaces. The tool uses a digital CCD line camera. As the core is rotated by an electric motor, the camera scans the uppermost line, everytime with a circumferential increment of up to 0.05mm(20pixels/mm) and hence a complete 360$^{\circ}$ unwrapped image(core image) is produced. This paper illustrated diverse research benefits of such core images from several test sites in our country. All scanned images could be stored as a data-base one and easily used with software facilities \circled1 to evaluate a percental distribution of mineral components or grain size etc. not only for the rock classification but also for e.g. the assessment of building stones, \circled2 to study potential reservoirs as a hydrocarbon indicator using ultraviolet fluorescence reflection from cores, \circled3 to facilitate the qualitative and quantitative analysis of fractures, \circled4 to evaluate the fractures and thin bedded reservoirs using spectral color responses. Based on abundant scanning experiments, it would seem that this imaging work should lead to reflecting the future trend in underground survey toward a more comprehensive understanding of the properties and behaviors of in situ rocks.

• Earthquakes and Structures
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• v.18 no.1
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• pp.97-111
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• 2020

Cylindrical steel tanks are important components of industrial facilities. Their safety becomes a crucial issue since any failure may cause catastrophic consequences. The aim of the paper is to show the results of comprehensive FEM numerical investigation focused on the response of cylindrical steel tanks under mining tremors and moderate earthquakes. The effects of different levels of liquid filling, the influence of non-uniform seismic excitation as well as the aspects of diagnosis of structural damage have been investigated. The results of the modal analysis indicate that the level of liquid filling is really essential in the structural analysis leading to considerable changes in the shapes of vibration modes with a substantial reduction in the natural frequencies when the level of liquid increases. The results of seismic and paraseismic analysis indicate that the filling the tank with liquid leads to the substantial increase in the structural response underground motions. It has also been observed that the peak structural response values under mining tremors and moderate earthquakes can be comparable to each other. Moreover, the consideration of spatial effects related to seismic wave propagation leads to a considerable decrease in the structural response under non-uniform seismic excitation. Finally, the analysis of damage diagnosis in steel tanks shows that different types of damage may induce changes in the free vibration modes and values of natural frequencies.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.123-128
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• 2005

Buk-myeon area in Changwon is located near Nakdong river and not short of quantity of river but the water quality and quantity is changed extremely by seasons, and Fe, Mn, Cu are found at the base rock underground water. Therefore, bank filtrated water developing is settled. At this research, Pilot-Plant is built to find out Fe and Mn are detected and eliminated by biological process and the ammonia is exceeded the drinking water quality criteria at the bank filtrated water while designing and facilitating the local water supply facilities at Buk-myeon area. Also, check results of the changed treatment process of automatic precipitating filter, which is producing and supplying drinking water, and analyzing the Biological Process Effectiveness by building and running Buk-myeon Water Treatment Facility, which could provide $10,000m^3/day$.

• Explosives and Blasting
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• v.26 no.1
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• pp.49-55
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• 2008

Mechanical excavation techniques employing tunnel boring machines (TBM) and rock splitters have been proposed to minimize rock damage for tunnel and underground waste repository facilities. Such a mechanical excavation, however, is extremely expensive and not applicable in all cases. For these reasons, controlled blasting using notched charge holes have been suggested to achieve crack growth along specific directions and inhibit growth along other directions. This study introduces a dynamic fracture process analysis code to simulate fracture processes of rock which has a notched charge hole.

• Journal of environmental and Sanitary engineering
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• v.17 no.1
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• pp.20-27
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• 2002

This study has researched the indoor air Pollution in the school classrooms. It focused on the school classrooms in which the students take part in many loaming activities for a long time, not focused on the offices or underground facilities that have occupied the interest so far. First, I investigated the origination sources of indoor air pollution which influences on our health, and researched the data on the consequences of it on the human body. Second, I measured the indoor air Pollution level of the classrooms in which the students take part in activities. I selected CO, $CO_2,{\;}SO_2,{\;}NO_2$and $PM_{10}$ as the research items. Each two schools were chosen in the elementary schools, middle schools and high schools as the ones for measurement. And I distinguished the boys' schools from the girls' schools in the middle and high schools. CO, $SO_2{\;}and{\;}NO_2$were comparatively low comparing with the recommendation of the Ministry of Environment. But, $CO_2{\;}and{\;}PM_{10}$ exceeded the standard concentration in most schools and there was a difference between boys'classrooms and girls'classrooms about them. Also, it was different by the number of members a classrooms. Third, I made a questionnaire on the on the indoor air pollution. The questionnaire showed that many students feel the indoor air pollution directly and they are under the influence of it.