• Journal of the Korean Geotechnical Society
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• v.19 no.6
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• pp.325-334
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• 2003

It is very difficult to rehabilitate the damaged earth dam core to manage it stably against development of flow path and increase of leakage by hydraulic fracture. In this study, application of CGS (Compaction Grouting System) to damaged earth dam core was noticed by analyzing and comparing the results of the in-situ data and FEM. Results of in-situ data showed that according as progress of rehabilitation works tip pressures increased and volume of injection decreased, voids of damaged dam core were filled with materials similar to origin dam core. Rehabilitations caused turbidity and volume of leakage to decrease at the same water level. Also, results of FEM analysis indicated that permeability decreased by rehabilitation. Through this study, it is proved that CGS is able to decrease permeability coefficient, volume of leakage and turbidity on damaged earth dam core.

• Korean Journal of Construction Engineering and Management
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• v.17 no.3
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• pp.116-124
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• 2016

Work efficiency of earth work which is one of the main works occurring in construction site mainly depends on the performance of individual operators of earth work equipment. Consequently, the skill of individual operators of earth work equipment can significantly affect overall construction schedules. Many invisible areas inevitably exist in construction site because of the nature of construction site where occlusions occur from structures being built, installed or moving equipment, moving workers, etc. The lack of visual information regarding tasks critically impedes the effective performance of operators of earth work equipment. AR (Augmented Reality) is a computer technology that superimposes virtual objects onto the real world scene. This characteristic of AR may address the lack of visual informations in earth work process, thus helping to improve the work efficiency of operators of earth work equipment. The purpose of this study is to present a task-visual information map that identifies visual informations required in tasks of earth work and which of the tasks are suitable for AR technology. This study focuses on visual informations in tasks of earth work with excavators. The map was created based on the investigations on the problems of each task of earth work with excavators and visual informations required to address the problems. Through the map, four visual informations were found to be suitable for AR technology to improve the work efficiency of excavator operators. Based on the findings of this study, AR systems for excavators can be developed more effectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.385-392
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• 2021

In general, earth retaining work in construction works enables the construction of structures, prevents the displacement of the surrounding ground to the maximum extent, and plays an important role in ensuring the safety of the surrounding structures and field workers. The earth retaining work and the construction method differ according to the various ground characteristics, surrounding topographical characteristics, repair environment, and design conditions. In particular, in the case of Seoul city, the environments and ground conditions differ according to the area. This study analyzed the earth retaining work cost mainly for the apartment construction project in Seoul and calculated the approximate earth retaining work cost at the project planning stage. A model was developed to predict the cost of earth retaining work that matches the characteristics of Seoul City and predict the construction cost for earth retaining work. This paper presents the predicted earth retaining work cost using a multiple regression model that applies 10 project outlines as independent variables. The error rate of the prediction result of the earth retaining work cost of the apartment construction project in Seoul using multiple regression models was 10.75%.

• Proceedings of the Korean Geotechical Society Conference
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• 1999.11c
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• pp.117-128
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• 1999

Geosynthetics have been studied especially Korean Railway earth works from the outset and have proved successful in both technical and economic terms. Hitherto Geosynthetics have been given consideration chiefly in dimensioning the requisite track subbase thickness, but have not been considered when calculating the thickness of the frost protection layer. this often made it impossible to reduce the thickness of the subbase. The article therefore puts forward a proposal for considering the German Geosynthetics in dimensioning the requisite thickness of the frost protection layer.

• Journal of the Korean Geophysical Society
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• v.9 no.1
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• pp.21-25
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• 2006

Aerial photo process with digital camera has some benefits. It is fast and simple by digital way incomparison with aerial photo based on film. Also it works with GPS/INS device to do direct geo-referencing. Sdata and digital map and GCP is produced. In base on it, ortho images are produced and compared with surveying data.

• Journal of KSNVE
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• v.5 no.1
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• pp.67-73
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• 1995

In earth moving construction equipment used for rough and dangerous works, seat suspension system is the only means for reducing the vibration transmitted to the operator. Thus ISO(International Organization for Standardization) 7096 suggests a recommendation for the vibration characteristics of the seat suspension system in order to protect the human beings from excessive vibrationl. In this research, a new mechanical type seat suspension system is designed and a mathematical model, effective design parameters of the seat suspension system are determined and concept design strategy is presented.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.36 no.4
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• pp.279-286
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• 2018

In the civil works, the measurement of earth-volume is one of the important elements in the estimation of the reasonable construction cost. Related studies mainly used GPS (Global Positioning System) or total station to obtain information on civil work areas. However, these methods are difficult to implement in inaccessible areas. Therefore, the aim of this paper is to use the UAV (Unmanned Aerial Vehicle) to measure the earth-volume. The study area is located in a reservoir construction site in Sangju-si, Gyeongsangbuk-do, Republic of Korea. We compared the earth-volume amounts acquired by UAV-based surveying to ones acquired by total station-based and GPS-based surveying, respectively. In the site, the amount of earth-volume acquired by GPS was $147,286.79m^3$. The amount of earth-volume acquired by total station was $147,286.79m^3$, which is the 96.13% accuracy compared to the GPS-based surveying. The earth-volume obtained by UAV was $143,997.05m^3$ when measured without GCPs (Ground Control Points), $147,251.71m^3$ with 4 GCPs measurement, and $146,963.81m^3$ with 7 GCPs measurement. Compared to the GPS-based surveying, 97.77%, 99.98%, and 99.78% accuracies were obtained from the UAV-based surveying without GCP, 4 GCPs, and 7 GCPs, respectively. Therefore, it can be confirmed that the UAV-based surveying can be used for the earth-volume measurement.

• Journal of the Korean earth science society
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• v.44 no.1
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• pp.62-78
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• 2023

The purpose of this study is to analyze the field of Earth science at a science fair. For this purpose, 566 pieces of data spanning 21 years (2000 to 2020), acquired from entries in the Earth Science section on the science fair website, were analyzed using the semantic network method. As a result, geoscience topics have been actively explored in works submitted for the Earth Science section of the science fair. Fossils from the Cretaceous period of the Mesozoic Era were particularly predominant. Together with these, keywords corresponding to astronomy, space science, and atmospheric science formed a small-scale network. Astronomy and space science mainly dealt with the dynamic characteristics of asteroids, Venus, and Jupiter. Other subjects included the solar system, sunspots, and lunar phases. Atmospheric science has focused on atmospheric physics, atmospheric observation and analysis technology, atmospheric dynamics, air quality monitoring, while marine science has been limited to physical oceanography and geologic oceanography. This study, is expected to help select Earth Science topics and conduct inquiry activities in schools.

• Journal of Daesoon Thought and the Religions of East Asia
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• v.3 no.2
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• pp.13-34
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• 2024

This article is a compilation of civilizational crises and their overcoming from the worldview of Daesoon Jinrihoe, based on the premise that religion can offer advice on the crises faced by modern civilization. It is a reinterpretation of human history from a religious perspective, focusing on mutual contentions, grievances, grudges, and their overcoming. Daesoon Jinrihoe explains that modern civilizational crises were first recognized by divine beings in the 18th and 19th centuries, and then later recognized by humans in the 20th and 21st centuries. Unable to resolve the civilization crises, the divine beings asked the Supreme God to intervene in human history, and the Supreme God was born in a human body to reveal the root causes and development of various civilizational crise sand to propose solutions to overcome them. These solutions encompass setting the world aright and ushering in a new era through the Reordering Works of Heaven and Earth (天地公事), attaining enduring peace by practicing grievance resolution for mutual beneficence (解冤相生), and reconstructing the relationship between divine beings and humans in harmonious coexistence. Devotees hold that Daesoon Jinrihoe is a religion that originated as a solution to a problem faced by God rather than humankind. As such, it considers the crises of civilization and their overcoming as the reason for existence. According to the religion's worldview, the Supreme God has already provided the solution to these civilizational crises. With a tip of the hat to the film Interstellar (2014), it could be said, "God Found a Way. He Always Has." Now, Daesoon Jinrihoe posits that it is up to humans to implement the way that God found.

• Journal of Science and Technology Studies
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• v.20 no.1
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• pp.113-155
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• 2020

This paper reviews literature from history, media studies, and anthropology to provide an expansive spatio-temporal framework that examines the epistemic and material aspects of computing technologies in the Anthropocene. Reconceptualizing computing as planetary technology has become imperative in the Anthropocene, in which digital sensors, devices, and infrastructures are increasingly mediating human activities to understand, utilize, and consume the Earth. Drawing upon the previous works that have examined the social, political, and cultural elements of information and communication technology (ICT), we provide three perspectives to reconsider the relationship between computing technology and the planet. Computing technologies are increasingly being adopted to measure the anthropogenic impacts on the plant, while these technologies themselves also take part in leaving deep social and material traces upon the Earth's surface. In this sense, we argue that the Anthropocene and computing technologies are co-constructive. Such a renewed perspective on computing and the Anthropocene, we hope, would bring new scalar imaginations to future studies on ICT.