• Journal of Korea Water Resources Association
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• v.41 no.8
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• pp.825-834
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• 2008

Riverbank filtration for water supply has been employed for about 150 years in developed countries. In Korea, the feasibility of riverbank filtration has been investigated since 1990's for large river basins, to find a solution to stably meet the ever-increasing demand for water. Recently, some cites in the Nak-dong River Basin have been supplying the water through riverbank filtration. This research studies the feasibility of riverbank filtration in Seoul. Analytic Hierarchy Process (AHP), which selects the most optimal alternative by hierarchically classifying various attributes and then quantifying the importance of each attribute, was applied to candidate locations for the selection of riverbank filtration site. The Kwangnaru district, which has advantages in water quality and close connectivity to the existing water purification facility, was selected as the most optimal site.

• Journal of the Korea Institute of Building Construction
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• v.18 no.5
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• pp.479-488
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• 2018

The issue of waste and its recycling is perceived as a worldwide environmental problem, and the plastic waste is perceived as the biggest social problem threatening the lives of mankind. The vertical protective net, manufactured by using the plastic resin is vertically installed on the outside in case of formwork at the construction site, in order to prevent the fallen objects and scattered dusts. The objective of this study is to understand the actual use status of vertical protective net in the construction site, to examine the changes in the environment-related regulations recently strengthened in the construction site, and also to improve the field technicians' perception of it. And based on it, this study aims to suggest the measures for using the rational and environment-friendly materials and also for promoting the recycling of vertical protective net as the vertical protective nets made of plastic resin are thoughtlessly used in the construction site.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.27 no.3
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• pp.231-237
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• 2017

Objectives: This study was conducted to determine firefighters' work-related accident rate and investigate the factors affecting their on-site safety. Methods: We developed a web-based self-reported questionnaire designed to inquire into firefighters' work-related accident experience and the factors (4M; Man, Machine, Media, Management) affecting firefighters' on-site safety. We distributed questionnaires to all members of firefighting organizations in South Korea by e-mail and 9,149 were returned, resulting in a response rate of 23.1%. Results: Fifteen point seven percent of the respondents reported work-related injuries within the past one year, and 35.1% answered that current accident investigation reports are not helpful for preventing the same accident from recurring. Among the 4M factors, the one most affecting firefighters' on-site safety in the order of priority is the Man factor, followed by Machine, Media, and Management. However, the results from detailed sub-categorical factors showed some differences. 'Lack of human resources', one of the Management factors, was the most influential (70.3%), followed by 'worn-out equipment' under the Machine factor (67.2%). The viewpoint of elements of the Man factor including 'forgetting instructions' and 'fatigue and illness' were significantly different according to firefighters' rank. The higher the firefighter's rank, the more they answered 'forgetting instructions,' while the opposite was the case for 'fatigue and disease'. Conclusions: The present firefighters' accident investigation report needs to be improved, and the 4M method could prove very useful. In addition, it is necessary to set up a proper firefighters' accident investigation and prevention system.

• Korean Journal of Materials Research
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• v.1 no.4
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• pp.184-190
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• 1991

Oxygen chemisorption on single crystal ZrC(111) surface was studied by high-resolution electron energy loss and ultraviolet photoelectron spectroscopy. At a low amount of oxygen exposure, adsorbed oxygen atoms construct $(\sqrt{3}{\times}\sqrt{3})R30^{\circ}$ structure. On the other hand, oxygen adsorption changes into $1{\times}1$ structure as the amount of oxygen exposure increases. The adsorbed oxygen atoms show smaller vertical distance from the Zr topmost layer in the $1{\times}1$ structure than in the $(\sqrt{3}{\times}\sqrt{3})R30^{\circ}$ structure and approach to the bridge site rather than 3-fold hollow site. The two different oxygen adsorption behavior comes from the two different surface stales of the clean ZrC(111) surface.

• The Journal of Engineering Geology
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• v.22 no.2
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• pp.185-194
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• 2012

The efficient maintenance and management of steep slopes often require excessive professional resources and quantitative investigations. Therefore, it is important to develop technology for objective scientific site investigations and quantitative evaluations of steep slopes. This study proposes a 'Mobile System' for steep slopes in order to improve the effectiveness of site investigations compared with conventional methods using anevaluati on table. By analyzing site investigations and desktop studies, the required software and hardware are identified to develop the 'Mobile System', consisting of a 'Field Information Input System' and an 'Analysis System'. The applicability of the system is verified by its application to an area with steep slopes affected by debris flows. The use of this system is expected to increase the efficiency of maintaining steep slope sand to reduce the time and resources required.

• Journal of the Korea Institute of Building Construction
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• v.20 no.4
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• pp.367-373
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• 2020

As the supervision in site is integrated into construction management, the organization's work is expanded, and the perspective and goals of the work have changed, so there is a high possibility that the conflict situation within the organization will increase. Organization conflict increase a job stress of workers, so it acts as a negative factor in deriving organizational performance. Therefore, the purpose of this study is to analyze the correlation between organization conflict and job stress of construction manager in construction site. As a result of the study, the organization conflict of the construction manager was generally low, and the job stress was also less than that of other area's workers. In addition, correlation analysis revealed that organization conflict and job stress were related. The results of this study may help to improve the organization structure in the construction management site organization.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.46-53
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• 2001

Differing Site Conditions('DSC') Claims among construction claims are on the increase as a direct result of the steady construction of Social Overhead Capital Facilities initiated by Government. As DSC claims generally became apparent during the intial stage of the construction project, it is necessary to timely review and study the proposal on the prevention of DSC claims because delayed settlement will incur more substantial damages to all parties concerned. This research is focused on the identification and analysis of the causes for DSC claims as applicable to design-build project in public sector and it presents the possible short term, medium and long term proposals on the improvement of causes related with DSC claims. The major results of this research are summarized as follows: 1. Improvement of contractor's tender practice 2. Contractor's division of responsibility on the site survey 3. Improvement of owner's exculpatory clause 4. Flexibility on the adjustment of contract amount The proposals stated above could be useful in resolving the DSC claims between owner and contractors.

• Journal of the Korean Association of Geographic Information Studies
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• v.3 no.4
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• pp.33-49
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• 2000

This research demonstrates the application of GIS to the selection of the waste landfill site through the case study of a urban area. The estimation factors for the suitability analysis of the waste landfill site were determined. The database was built through collection, input, and transformation of data. The recent land cover classification data and NDVI data which were obtained through processing of satellite imagery were incorporated into GIS data as estimation factors. The relative weights of importance among 2nd category estimation factors were determined by the pairwise comparison method. Also relative weights of 1st category estimation factors which are divided into the social-economical factor and the natural environmental factor were combined with those of 2nd category estimation factors. As the results of this case study, the suitability analysis was conducted in accordance with various estimation criteria. The highest suitability index was obtained in the case where we considered the relative weights of 2nd category estimation factors as different in the viewpoint which regards the social economical factor as important.

• Journal of the Korean Geographical Society
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• v.40 no.3 s.108
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• pp.274-284
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• 2005

On the subject of Yeoungsan River Yeoungbon c and Seumjin River Seumbon e site discussing as the measuring points of discharge and Quality by the Department of Environment, this study executes the tests of proprieties and examines the methods of flow measuring and assessment. The result of this study may summarize as belows. According to the hydrogeomorphological aspects and artificial effects, Yeoungbon c and Seumbon e site are not proper for the measuring points of the water levels. Also, the methods of river discharge measuring by the specific discharge method, first tried in this study, has an enough reliability which can be used to measure the site where is difficult to measure the flow directly or to select the representative site to measure on the up and downstream. In case of accumulating the specific discharge data throughout the flow observation by seasons and periods for a long time, these may be used to measure the flow as well.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.392-395
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• 2007

Recently, the construction wastes rapidly increase because of redevelopment, the development of new urbanization of large housing development, the expansion of social infrastructure. With increase of the construction noise caused by these developments, environmental conflicts and civil appeals increase. Moreover, the Government will reduce construction noise level to 65dB from 70dB in January 2009. Therefore, it will be expected to increase environmental conflicts and civil appels related to construction noise. To minimize environmental conflicts and civil appels, this study compared and analyzed measured noisy values of a crusher for the site-recycling to predicted value of simple noisy prediction program developed by "National Institute of Environmental Research". Based on the results, a crusher for the site-recycling can be arranged to minimize the noise.