• Journal of the Society of Disaster Information
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• v.15 no.4
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• pp.459-468
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• 2019

Purpose: The cavity exploration of the lower part of the road is carried out to prevent ground-sinking. However, the detected communities cannot be identified by the cavity location and history information, such as repackaging the pavement. Therefore, the field applicability of RFID systems was evaluated in this study to enable anyone to accurately identify information. Method: During temporary recovery, tag recognition distance and recognition rate were measured according to underground burial materials and telecommunication tubes using RFID systems with electronic tag chips attached to the bottom of the rubber cap. Result: The perceived distance and perceived rate of depth for each position of the electron tag did not significantly affect the depth up to 15cm, but it did have some effect if the depth was 20cm. In addition, water effects from nearby underground facilities and rainfall are relatively small, and the effects of wind will need to be considered during the weather conditions of the road. Conclusion: The RFID tags for field application of the pavement management system store various information such as location and size of cavity, identification date, cause of occurrence, and surrounding underground facilities to maximize cavity management effect with a system that can be computerized and mobile utilization.

• Journal of Korean Society of societal Security
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• v.1 no.1
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• pp.53-62
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• 2008

Recently, the potential risks of tank lorry transportation from the petrochemical plant have been increasing, so the research was performed to build up the evaluation criterion of the transportation safety, as well as aggressive risk+assessment of a variety of chemical materials. This research was applied to the Maximum Credible Accident Analysis technique and modeled on the risk management of chemical transportation using the following four steps for risk evaluation, firstly the comparison of representative fype and standard of hand ling chemical materials transported by tank vehicles secondly, specific classification of potential hazards thirdly, grasp and recognition of virtual accident scenario at last, the risk evaluation of virtual accident scenario(qualitative/quantitative - chemical release modeling).

• Journal of the Society of Disaster Information
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• v.8 no.1
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• pp.27-35
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• 2012

The main objective of this paper is to evaluate the field applications and the noise reductions of micro surfacing pavement, which is often used to reduce environmental problems. A traffic noise mechanism was analyzed and a modified mix design method was proposed for nighttime constructions. Results on noise measurements using the statistical pass-by method showed noise reductions of 2.0 to 7.1 dB were observed. In addition, results on noise measurements using the close proximity method demonstrated that noise reductions of 5.6 to 6.7 dB were recorded under vehicle speed of 80km/h. The noise measurements revealed that the close proximity method was more stable than the statistical pass-by method. As a result, the effect of micro surfacing pavement on noise reductions was proved through the research. It is considered that the micro surfacing pavement method could be used as a preventive maintenance method and a comfortable noise reducing pavement technique.

• Journal of the Society of Disaster Information
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• v.14 no.2
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• pp.141-153
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• 2018

Purpose : The subject site selected in this study was a place that was prepared through the reclamation of foreshore completed in 1973. Since then, the site has been occupied by the industry of ship repair for over 30 years. Method : The results of a precise soil examination conducted in 2013 showed that the site was seriously contaminated with TPH over an area of $10,000m^2$ and GL(-)3.0m in depth, with an expanding coverage of contamination. Results : The soil contamination by refined petroleum products often results in adverse effects to human health and ecological systems, thus the contamination should be purified as soon as possible. Conclusion : Hydrogeological investigation can be employed to assess the groundwater movement and propagation of contamination to determine the potential agents or contaminants in the soil contaminated with high concentration TPH.

• Journal of the Society of Disaster Information
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• v.9 no.4
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• pp.469-475
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• 2013

The purpose of this experimental research is to estimate compressive strength and resistance to freezing and thawing of recycled aggregate concrete containing ground granulated blast furnace slag. For this purpose, concrete specimens according to substitution ratio of recycled aggregate were made for different replacement ratio of ground granulated blast furnace slag(GGBFS), and then compressive strength and resistance to freezing and thawing were evaluated for those. It was observed from the test results that compressive strength at 28 days of recycled aggregate concrete containing GGBFS of 20% was much more excellent than plain concrete and when air content of concrete was maintained 4 to 6%, influence of substitution ratio of recycled aggregate and replacement ratio of GGBFS on resistance to freezing and thawing was little up to 300 cycles of freezing and thawing.

• Journal of Environmental Impact Assessment
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• v.32 no.5
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• pp.338-352
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• 2023

As of 2019, Korea's fine dust is the most severe among 38 OECD countries, and in the same year, 「the Framework on Disaster and Safety Management」 was revised to define fine dust as a social disaster. Currently, the government is working to achieve its emission reduction goals by preparing a comprehensive fine dust management plan (2022-2023) consisting of a total of five areas, 42 tasks, and 177 detailed tasks. However, it is necessary to come up with measures in consideration of the various spatial characteristics of the city, not just as a source of emission. Therefore, in this study, the shape of the city was classified using the LCZ (Local Climate Zone) classification system into 17 types by building type and land cover type in Busan, and the average annual PM10 and PM2.5 concentration were mapped using the IDW technique. In addition, Fragstats and Moving Window were used to quantify the LCZ classification system. Finally, correlation analysis and regression analysis were conducted to analyze the relationship between the LCZ classification system and PM10 and PM2.5. As a result, it was confirmed that the type of low height of the building and the type of green space with trees had a positive effect on the concentration of PM10 and PM2.5. Therefore, this study is expected to be used as basic data to establish fine dust reduction policies based on efficient spatial planning.

• Journal of the Society of Disaster Information
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• v.10 no.1
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• pp.40-48
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• 2014

A number of attempts has been made to reinforce ballasted track substructure to meet the requirement of high-speed operation and effective rehabilitation of existing railroads. For the purpose of this, the use of geogrid has been applied, and the benefit of its use has been recognized via previous studies. In this study, an experimental pullout test was carried out to investigate the influence of normal stress on pullout strength of geogrid using different types of soil and geogrid. The results revealed that the pullout resistance generally tends to increase proportional to normal stress while the pullout coefficient interaction decreases, which is a function of material interface properties, such as the friction angle of soil, and interlocking condition between soil and geogrid. In addition, a methodology based on work-energy concept was proposed to evaluate effectiveness of geogrid and limitedly verified using test results.

• Journal of Korean Society of societal Security
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• v.1 no.2
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• pp.79-85
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• 2008

In this study, a new procedure (Unified Dynamic Analysis Method) to evaluate the dynamic responses a bridge under earthquakes is proposed, which is not only considering the bridge motions but also the soil layer motions nearby the bridge footing in order to include the soil-structure interactions. lt is found that the dynamic responses of the whole bridge systems can be properly evaluate from using the proposed UDAM. The properties of the soil layers where the bridge is located can be included into the seismic analysis, and the multi-seismic excitations can also be considered easily.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.33-33
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• 2022

팔당댐 유역은 수도권 2600만 인구의 상수원으로, 수도권 전체 물 소비량의 90.2%에 달하는 물을 공급하고 있어 중요성이 상당히 크다. 하지만 기후변화로 한반도에 극한기후의 발생 빈도가 증가하면서 미래 수자원 관리가 더욱 어려워질 전망이다. 이에 본 연구에서는 모형 구축을 통해 기후변화가 팔당댐 유역의 수자원에 미치는 영향을 정량적으로 평가하고자 하였다. 본 연구는 저수량이 높은 다목적댐이자 상류에 위치하는 소양강댐, 충주댐의 유역의 유입량을 수문모형인 VIC model로 모의하였다. 댐의 존재에 따른 하류의 유량 교란을 고려하기 위해 딥러닝 기반의 LSTM 예측 모형을 활용하였고 각 댐의 방류량을 예측하였다. 보정 기간(1986-2019), 검증 기간(2020)에 대한 방류량 예측 모형의 NSE는 0.9407, 0.6449로 높은 예측성능을 보였다. 팔당댐 유입량 예측에도 LSTM이 활용되었고 소양강댐, 충주댐의 방류량과 두 유역을 제외한 잔여유역의 기상변수인 강우량, 온도, 풍속이 입력되었다. 팔당댐 유입량 예측 모형의 NSE는 보정 기간(1986-2019), 검증 기간(2020)에 대해 각 0.9990, 0.7878로 유입량을 정확도 높게 예측하였다. 기후변화의 영향을 평가하기 위해 기상청에서 제공하는 RCP4.5의 상세화된 고해상도(1km) 미래 기상자료를 구축된 모형에 입력하여 미래의 팔당댐 유입량을 모의하였다. 모의 결과, 미래 기간에는 팔당댐 일 유입량의 변동성이 증가하면서 유황이 불안정해지고 극한에 해당하는 빈도 갈수량이 크게 감소하는 것으로 예측되었다. 따라서 극한기후로 인해 물 공급이 제한되는 재난 상황에 대비하여 물 공급에 대한 자립성을 높일 수 있는 새로운 물관리 정책이 필요할 것이다.

• Journal of the Society of Disaster Information
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• v.20 no.1
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• pp.93-105
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• 2024

Purpose: This study aims to quantitatively determine the impact on nearby risidents by selecting the amount of chemicals emitted from the workplace among the substances subject to the chemical emission plan and predicting the concentration with the atmospheric diffusion program. Method: The selection of research materials considered half-life, toxicity, and the presence or absence of available monitoring station data. The areas discharged from the materials to be studied were selected as the areas to be studied, and four areas with floating populations were selected to evaluate health risks. Result: AERMOD was executed after conducting terrain and meteorological processing to obtain predicted concentrations. The health hazard assessment results indicated that only dichloromethane exceeded the threshold for children, while tetrachloroethylene and chloroform appeared at levels that cannot be ignored for both children and adults. Conclusion: Currently, in the domestic context, health hazard assessments are conducted based on the regulations outlined in the "Environmental Health Act" where if the hazard index exceeds a certain threshold, it is considered to pose a health risk. The anticipated expansion of the list of substances subject to the chemical discharge plan to 415 types by 2030 suggests the need for efficient management within workplaces. In instances where the hazard index surpasses the threshold in health hazard assessments, it is judged that effective chemical management can be achieved by prioritizing based on considerations of background concentration and predicted concentration through atmospheric dispersion modeling.