• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.546-550
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• 2012

본 연구에서는 홍수시 제내지 침수로 인한 큰 인명 및 재산 피해의 가장 큰 원인이 되는 제방 붕괴과정을 제방의 침식 및 세굴이론 등 물리적 이론에 근거하여 해석하고 이를 토대로 하천제방 붕괴 모형을 개발하였다. 개발된 모형을 이용하여 하천제방 붕괴 모의를 수행하여 제내지의 2차원 침수양상을 분석하고 이를 이용하여 침수위험도를 작성하였다. 작성된 침수위험도는 제내지에 거주하는 주민들이 효율적으로 제방붕괴에 대한 대처할 수 있을 뿐만 아니라 제방붕괴로 인한 홍수재해보험 보험요율 산정시 침수위험도에 근거한 합리적 산정이 가능할 것으로 판단되었다. 본 모형의 적용 결과 홍수로 인한 제내지 침수위험도 산정을 위해 하천흐름-제방붕괴-제내지 침수해석을 연계하여 일관성 있게 모의할 수 있는 수치모형을 개발하여 실제 유역에 적용한 결과 제내지에서의 침수심, 침수면적, 하천 홍수위, 제방붕괴 폭 등이 합리적으로 계산됨을 알 수 있었다. 시간에 따른 제방 붕괴폭은 기존의 모형에서 사용하고 있는 순간적, 선형적인 붕괴가 아니라 포물선형의 붕괴가 이루어지고 있었으며 시간에 따라 붕괴폭도 합리적으로 계산되고 있음을 알 수 있었다. 제내지의 침수심을 토대로 제내지 홍수시 침수위험도 산정기법을 개발하여 위험도를 산정한 결과 하천변에 위치한 지역이 위험도가 무조건적으로 높은 것은 아니라 지형에 따라 달라질 수 있음을 나타내었다.

• The Journal of the Korea Contents Association
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• v.17 no.1
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• pp.50-57
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• 2017

This study investigated the causes and problems of train operation impediments through the statistics analysis of 8 years'internal data of Daejeon Metropolitan Express Transit. By evaluating the risks regarding the system, equipment, and parts of high risk group, this study measured the Risk Index Severity, and applied the $5{\times}5$ Risk Assessment Matrix which is a method of risk management to calculate the scale of risk to analyze the safety level and allowance range. As a result, the car sector, the most serious risk, followed by machinery and equipment sector showed that the inherent risk. In particular, the door broken and the door rail signaling and control devices due to defects of the vehicle is high, but also the severity, and frequency are showing very frequent additional potential accidents. PSD also had defects in the machinery sector appeared to be the most dangerous of the PSD poor safety gates, it was found that the glass also involve the risk of mishandling and breakage of the PSD. This study intended to contribute to the transportation benefits through the safety and stable operation of Metropolitan Express Transit.

• Journal of Science and Technology Studies
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• v.8 no.2
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• pp.27-56
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• 2008

The controversy over the mad cow disease in Korea can be understood as a demonstration of complex and skeptical public sentiments toward the government that were all mixed with expectations, demands, hope and mistrust. The governments decision to resume the import of American beef turned such expectations into mistrust and public hope into nationwide resistance expressed in the form of candlelight vigils. This phenomenon can not be simply explained as a fear of risks. Concerns over mad cow disease were a trigger but they were riot sufficient cause to explain the nationwide controversy involving all the Koreans. It was mad cow disease that triggered a sharp confrontation between the government trying to stick to its decision to resume the import of American beef and the opponents who were not convinced by the government. In fact, this is not simply an issue of a disease. It is rather a complex issue of the acceptance of risks, the consistency of the government policy, trust in the government, and the public consensus on the government policy. In this context, this study analyzes the controversy over the mad cow disease from the perspectives of risk management, public policy-making, and public trust and social consensus-building.

• The Transactions of the Korea Information Processing Society
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• v.7 no.5
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• pp.1401-1408
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• 2000

Critical prediction models that determine whether a design entity is fault-prone or non fault-prone play an important role in reducing system development cost because the problems in early phases largely affected the quality of the late products. Real-time systems such as telecommunication system are so large that criticality prediction is more important in real-time system design. The current models are based on the technique such as discriminant analysis, neural net and classification trees. These models have some problems with analyzing cause of the prediction results and low extendability. In this paper, we propose a criticality prediction model using fuzzy rulebase constructed by genetic algorithm. This model makes it easy to analyze the cause of the result and also provides high extendability, high applicability, and no limit on the number of rules to be found.

• International Area Studies Review
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• v.14 no.3
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• pp.221-246
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• 2010

The paper is basically attempted to reveal a mechanism of exchange rate determination in global foreign exchange markets. For a theoretical framework, uncovered interest rate parity(UIRP), covered interest rate parity(CIRP), and real interest rate parity(RIRP) are tentatively adapted, and GARCH-M model is employed for an econometric methodology. Empirical evidence shows that the UIRP is superior to others, and the RIRP is better than the CIRP in explaining how exchange rates are determined in global exchange markets. All of them, however, is not fully supported by economic theories. Following Frankel(1989), country premium, volatility premium, and currency premium are evaluated to see if which premium is a crucial in disturbing the RIRP, and it is found that country and currency premiums are a major components in disturbing the RIRP. To this end, market-oriented and market-determined systems has to be built to avoid currency disputes which is undergoing hot issue in global foreign exchange market.

• Journal of the Society of Disaster Information
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• v.18 no.3
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• pp.609-621
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• 2022

Purpose: Natural Disaster has well formed framework more than social disaster, because natural disaster is controlled by one department, such as MOIS, but social disaster is distributed. This study is on the design of the integrated service platform for the social diaster data. and then, apply to the local governments. Method: Firstly, we design DB templates for the incident cases considering the incident investigation reports. For the risk management, life-damage oriented social disaster risk assessment is defined. In case of the real-time incident data from NDMS, AI system provides the prediction information in the life damage and the cause of the incident. Result: We design the structured and unstructured incident data management system, and design the integrated social disaster and safety incident management system. Conclusion: The integrated social disaster and safety incident management system may be used in the local governments

• Journal of the Korean Institute of Gas
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• v.27 no.4
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• pp.92-101
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• 2023

To solve the problem of climate change, carbon neutrality has now become a necessity rather than an option. Hydrogen is not only a energy storage that can supplement the intermittent production of renewable energy, but is also considered a good alternative in the field of utilization as it does not emit carbon dioxide after reaction. In order to revitalize hydrogen vehicles, one of the fields of hydrogen utilization, the construction of hydrogen station infrastructure must be preceded. Prioritization of risk factors is necessary for efficient operation and risk assessment of hydrogen stations, but due to the short operation period of domestic hydrogen stations, there is a lack of frequency data on accidents and their reliability is low. In this study, we aim to identify the causes and consequences of deviations in hydrogen stations through HAZOP analysis. Additionally, we intend to analyze them using Fuzzy-AHP. Through this, we intend to derive the decision values for the causes of deviations in hydrogen stations and apply them to hydrogen accident cases and risk assessments to confirm the reliability and utility of the data.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.414-414
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• 2012

하천에 산사태, 하천 주변 개발, 제방 및 댐 붕괴 등으로 인하여 다량의 토사가 돌발적으로 유입될 경우 유입된 토사가 하천의 거동에 미치는 영향은 막대하다. 또한 하도 내에 설치되어 있는 교량, 보와 같은 수공 구조물로 인하여 단면형태가 갑작스럽게 변화하는 경우나, 구조물로 인하여 토사가 퇴적되는 경우 하천의 수위 변화를 크게 유발하여 하천 범람과 제방 침식 등을 발생시키며 하천의 안전에 큰 위험 요인으로 작용하게 된다. 현재 다량의 토사가 하천에 돌발적으로 유입되는 위험으로부터 안전하게 보호하기 위해서 토사 유입 방지 대책에 대하여 많은 연구와 사업이 실시되고 있지만 이러한 치수대책이 완전하다고 하기에는 다소 어려운 상황이다. 따라서 홍수 조절 및 방재를 위한 수방대책 수립 및 수자원의 집중적인 관리가 무엇보다 절실히 요구되며, 이와 같은 토사에 의한 방재대책 수립을 위해서 수리학적 특성을 정확히 파악할 필요가 있다. 본 연구에서는 2011년 7월에 발생한 강우에 의하여 침수피해가 발생된 경기도 이천의 오천천을 대상으로 수치해석을 통한 침수 범람 원인을 분석하였으며, 하류부에 위치하고 있는 공장의 경우 내부가 1m이상 침수됨에 따라 흔적수위 및 현장 상황을 조사하였고, 당일 강우를 통한 홍수위를 산정하여 여러 가지 원인별 홍수 원인을 분석하였다. 2011년 7월에 발생된 강우는 복하천 하천정비기본계획에 제시되어 있는 설계빈도로 30년 빈도에 못 미치는 것으로 나타나 강우에 의한 영향보다는 외부 영향으로 판단되며, 상류로부터 순간적으로 유입된 토사의 과다 퇴적에 의한 수위 상승에 의하여 교량 및 보 등의 수공구조물과 연계된 통수 단면적의 부족 등의 영향으로 홍수 범람이 발생된 것으로 분석되었다. 홍수 범람에 의한 영향을 분석하기 위하여는 단순히 강우에 대한 영향을 고려하는 것 보다 하천의 전반적인 특성을 고려하여 정확한 원인 규명을 통한 대처방안이 수립되어야 하며, 지속적인 모니터링을 통하여 하천에 의한 피해를 최소화 할 필요가 있다.

• Korean journal of communication and information
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• v.70
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• pp.246-276
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• 2015

From a historical perspective of risk communication, risks can be classified by their associated level of responsibility. In the case of technical risks such as hazardous chemical accidents, people perceive that risk-related organizations have a high level of responsibility; however, they do not in traditional risks such as natural disasters. This study aims to examine risk information seeking and processing, as seen in two types of risk, based on the Risk Information Seeking and Processing(RISP) model. For this purpose, hypotheses and a research question are developed with current domestic risk issues, and the results show significant differences in risk information seeking and processing between the two types of risk. Specifically, in the case of the chemical spill accident, negative emotion against relevant institutions makes different information seeking and processing compared to the natural disaster. The low level responsibility risk such as typhoon comparatively follows the flow of the original RISP model. However, the high level responsibility risk such as the hydrofluoric acid spill did not match with the RISP model. Based on the research results, theoretical implications were discussed.

• Journal of Preventive Medicine and Public Health
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• v.28 no.2 s.50
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• pp.473-486
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• 1995

A hospital-based, matched case-control study was carried out to evaluate the relation ship of various suspected risk factors including snoring and serum level of cholesterol to cerebrovascular disease in Korea. A total of 127 incident cases of cerebrovascular disease(74 cases of cerebral infarction and 53 cases of intracerebral hemorrhage) admitted to. the department of neurology in a university hospital from December, 1993 to March, 1995 were compared with 127 matched controls admitted to same hospital in same period. A multivariate analysis suggested that ECG abnormality(left ventricular hypertrophy and atrial fibrillation), family history of cerebrovascular disease, fundoscopic abnormality, previous history of transient ischemic attack and hypercholesterolemia were risk factors of cerebrovascular disease, ECG abnormality, fundoscopic abnormality, smoking and hypercholesterolemia were also suggested as risk factors of cerebral infarction.