• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.185-186
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• 2022

2012년 9월부터 건설현장 위험성평가는 안전관리 업무로 의무화되었으나, 해당 근로자가 사전위험성을 추정하고 대책을 수립하여 재해예방 활동으로 연계되기에는 위험성평가 작성부터 어려움이 있다. 위험성평가 운영시스템 구축을 통해 건설현장 근로자가 해당작업의 위험요인 및 안전대책을 쉽게 파악할 수 있도록, 작업 공종 선택만으로 해당작업의 다양한 위험요인과 안전대책을 제시하고, 해당 공종에서 발생한 재해사례를 보여줌으로써 동종 재해 재발방지 대책수립이 가능하도록 시스템을 구축하였다. 이러한 위험성평가 활동의 효과분석을 위해 H건설사의 운영평가에서, 위험성평가 운영시스템 구축 이후 건설현장 근로자가 위험성평가 활용에 쉽게 접근할 수 있고 해당공정의 위험요인 추정 및 위험예방 대책 수립이 가능하게 되었으며, 평가기간 동안 재해율 감소에도 영향이 있는 것으로 분석되었다.

• Journal of Convergence for Information Technology
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• v.10 no.8
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• pp.187-193
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• 2020

This study analyzed how risk factors in management affect the management of working capital in general hospitals in Korea. The data used accounting information for three years (2016~2017 and 2018) of 271 general hospitals using the medical institution accounting information disclosure system. The independent variables were the working capital level and the cash conversion cycle, The dependent variables were operational risk and market risk, Control variables were selected as components of working capital(cash, accounts receivable, inventory assets, accounts payable). According to the study, the lower the operational risk, the higher the level of working capital hospitals in Korea. Working capital decisions were confirmed to be attributable to operating risks, cash, inventory assets and accounts payable. And the lower the market risk (Operating Margin), the higher the cash conversion cycle. Therefore, it is necessary to review appropriate management measures of operational risks, cash, inventory assets and accounts payable identified as operating capital determinants so that medical institutions can also have economic response capabilities in consideration of the specificity of their operations.

• Korean Journal of Construction Engineering and Management
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• v.10 no.1
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• pp.78-90
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• 2009

Recently, operation of highway is the complex digital Infrastructure based on complicated IT. The application of IT is increasing more and more in digital Infrastructure. Though IT is very convenient, if unpredicted operating risk of highway occurs, widespread damage can be large. When operating risk of highway occurs, road users are out of smoothly-run service because of the operating interruption. This risk causes unpredicted operating management cost and additional maintenance cost. It will excess over the planned operating cost, which may leads to users's unsafety and operator's insolvency because of income loss. Until now, related studies to find out the risk are not sufficient. The purpose of this study is to suggest risk cost items and to estimate the reasonable risk cost by using simulation method in case of occurring the huge power failure at the operating digitalized highway. This study indicates the several plans to hedge against risk cost and the management of highway project. From now on, it will be used as basic data to confirm the soundness of operating system in Digital Infrastructure.

• Journal of Korea Port Economic Association
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• v.36 no.3
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• pp.55-74
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• 2020

With globalization and the development of information and communication technology, the supply chain is becoming more widespread and complex, which increases the occurrence and damage caused by supply chain risks. Supply chain risk management has a great impact on corporate performance through the analysis of risk factors and proactive and strategic approaches. This study aims to analyze the effects of supply chain risk factors on risk management strategies and corporate performance empirically. In the research model for empirical analysis, supply chain risk factors were classified into supply, demand, operation, network, and external environment, while the risk management strategies were divided into active and passive strategies, as well as financial and operational performance for corporate performance. The data obtained via the questionnaire were analyzed for the path of the structural equation model. As a result of the analysis, companies are actively pursuing risk management for internal risk factors, rather than external factors, in terms of internal and external risk factors, and it was found that these strategies have a significant effect on corporate performance. Therefore, in the future, companies should conduct risk management strategies more proactively and preemptively through a thorough analysis of various risk factors affecting business operations.

• Journal of Space Technology and Applications
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• v.3 no.3
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• pp.280-300
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• 2023

This paper includes the development and operational status of the space object collision risk management system operated by the Korea Aerospace Research Institute. Currently, it monitors 6 low-orbit satellites and 3 geostationary satellites for collision risks 24 hours, enabling prompt collision avoidance maneuvers to ensure safe and stable operations. Since Chinese anti-satellite test (ASAT) in 2007, the monitoring of collision risks between space objects and operational satellites has been taken seriously, leading to the development of various collision risk management systems to respond quickly and efficiently to such situations. This paper provides an introduction to the space object collision risk management system developed from 2007 to the present, the current status of artificial space objects around Earth, and the system currently in operation. Additionally, it outlines future prospects and plans for the system.

• Journal of Korea Port Economic Association
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• v.25 no.2
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• pp.57-72
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• 2009

The purpose of this paper is to show the empirical measurement way of operation risk evaluation in domestic seaports for overcoming the limitations which the traditional DEA method has by using 13 Korean ports in 2003 for 4 inputs(birthing capacity, cargo handling capacity, number of coastal guard vessel, number o f coastal special guard vessel ) and 5 outputs(Export and Import Quantity, Number of Ship Calls, number of coastal accident, number of coastal crime, number of coastal pollution). Because traditional DEA method has produced the limited set of information, negative DEA mixed with tier, stratification and layering methods should be adopted. The goal of negative DEA is to set up DEA models that will place the poor operating ports on or close to the empirical frontier. The core empirical results of this paper are as follows. First, Donghae ports should benchmark the operation way of Yeasu, Busan, Woolsan ports in terms of the middle and longterm base. Second, 5 ports(ports of Taean, Yeasu, Tongyoung, Busan, Sokcho) which were revealed as the poor operating ports in Negative DEA analysis should benchmark Incheon, Woolsan, Pohan, and Donhae ports. The policy implication to the Korean seaports and planners is that Korean seaports should introduce the new methods like Negative DEA of this paper for predicting the poor operating in the ports.

• Journal of Korean Society of Transportation
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• v.34 no.5
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• pp.421-436
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• 2016

Public-Private-Partnerships tend to be committed high project development cost and recover the cost through future revenue during the operation period. In general, long-term concession can bring on more revenue to private investors, but short-term concession less revenue due to the short recovering opportunities. The concession period is usually determined by government in advance or by the private sectors's proposal although it is a very crucial factor for the PPPs. Accurate traffic forecasting should be most important in planing and evaluating the operation period in that the forecasted traffic determines the project revenue with user fees in PPPs. In this regards, governments and the private investors are required to consider the traffic forecast risk when determining concession period. This study proposed a model for the optimal concession period in the PPPs transportation projects. Monte Carlo simulation was performed to find out the optimal concession period while traffic forecast uncertainty is considered as a project risk under the expected return of the private sector. The simulation results showed that the optimal concession periods are 17 years and 21 years at 5.5% and 7% discount level, respectively. This study result can be applied for the private investors and/or any other concerned decision makers for PPPs projects to set up a more resonable concession period.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.523-523
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• 2016

본 연구에서는 두 지역의 실제 상수관망에 대해서 부정류해석을 수행하였고 각각의 상수관망에 필요한 부정류피해 최소화방안을 제시하였다. 본 연구에서는 실제 도시 상수관망인 광탄 GT1-1 소블럭 상수관망을 대상으로 부정류해석을 수행하였고 신뢰성해석을 통하여 구역별 파괴 확률을 산정하였다. 또한 상수관망의 운영인자로써 물 사용량지수와 급수전지수, 사용연수지수, 수압지수, 사고이력지수를 개발하여 광탄 GT1-1 소블럭 상수관망의 운영지수에 의한 구역별 위험도를 분석하여 상대적으로 안전에 취약한 구역을 선정할 수 있었다. 광탄 GT1-1 소블럭 상수관망을 7개 구역으로 나누어서 신뢰성해석과 운영지수에 따른 위험도 분석을 수행하였고 상대적으로 수격압으로 인한 관로파괴에 취약한 구역을 선정할 수 있었다. 또한 광탄 GT1-1 소블럭 상수관망에서는 구역별 파괴확률과 운영지수에 따른 위험도 순위가 같게 나타났다. 본 연구에서 개발된 상수 관망의 신뢰성해석모형과 운영지수를 운영관리에 적용한다면 향후 개량이나 교체가 필요한 상수 관로의 우선순위 선정에 유용하게 사용될 것으로 판단된다.

• Fire Science and Engineering
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• v.24 no.2
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• pp.1-8
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• 2010

Accidents cases about hazardous materials in university laboratories and other places are reviewed in this thesis. Then the curriculums that are currently operated in related educational institutions are researched. The researched educational institutions include 'National Fire Service Academy', local 'Fire Service Academies' that are located in Gyeonggi, Busan, Gwangju, Gyeongbuk, and Chungcheong and nationwide 'universities'. A questionnaire survey about hazardous materials with fire officers who are on educational courses in National 119 Rescue Services and local 'Fire Service Academies' is also performed and analyzed. The analyzed results suggest several implications. First, the education courses concerning hazardous materials and the experiment manual should be developed very soon. Second, hazardous materials related courses should be performed by lecturers who has degree in related majors. The third, to prevent the accidents about hazardous materials, the professionals should be trained more. In sum, the experiment centered education courses about hazardous materials should be achieved.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.546-546
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• 2016

본 연구에서는 모의 강우 및 실제 발생된 강우 자료를 이용하여 우수관망도의 신뢰도와 위험도를 산출하였다. 모의 강우의 경우 과거 강우자료를 바탕으로 Markov Chain을 이용하여 모의강우발생을 하였으며, 과거 강우자료의 경우 IETD분석을 통해 대표 강우사상을 선정하였다. 또한, 우수관망도의 신뢰도와 위험도를 정량적으로 분석하기 위해 이정호(2012)에서 개발한 방법론을 이용하여 분석하였다. 또한, 우수관망의 경우 강우의 특성에 따라 발생되는 월류특성이 달라질수 있어 본 연구에서는 산정된 대표 강우사상을 그룹화 하여 그룹화된 강우 특성에 따른 위험도를 평가하였다. 우수관망의 경우 배수분구에서 발생되는 내수침수를 방어하기 위해 빗물펌프장이 운영되어 지고 있으며 본 연구에서 빗물펌프장의 운영수위 조건을 시나리오 제작하여 빗물펌프장 운영 수위에 따른 침수저감효과를 분석하였다. 운영수위 조건에 따라 가장 큰 침수저감효과를 보이는 시나리오와 현재운영수위의 월류량을 침수면적으로 변환하기 위해 서울안저누리에서 제공하는 침수흔적도를 이용하여 침수면적으로 변환하였다. 가장 큰 침수저감효과를 보이는 시나리오를 적용하여 침수면적을 산정한 결과 기존의 침수면적에 비해 5.20%의 침수면적이 감소하였다. 본 연구의 결과를 바탕으로 다양한 강우조건 및 펌프의 운영조건을 조합롭게 활용한다면 향후 비구조적 침수저감에 도움을 줄 것으로 판단된다.