• 지식경영연구
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• 제16권4호
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• pp.35-45
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• 2015

Fintech, which means the convergence of finance and information technology, becomes a hot topic in the financial sector. Through innovative activities on financial services, ICT(Information and Communication Technology) is integrated into the overall financial industry, and a new form of financial services could be expected to improve the existing financial system. On the other hand, fintech services are relatively vulnerable to security issues. Due to the process simplication and the channel fusion, the leakage of personal and financial informations, authentication bypass, phishing, and pharming are getting more concerned. In this study we investigated the security risk of fintech services in the viewpoints of service provider, technology adoption, and security policy. The possible countermeasures to reduce those risks are suggested because security is an important criterion for selecting financial services. This study basically offers quantification of the potential security risks and step-by-step control measures about business processes in the fintech services. The suggested security model includes user authentication, terminal security, payment information protection, API(Application Programming Interface) security, and abnormal transaction monitoring. This study might contribute to an understanding of the security risks and some possible measures for mitigating those risks on the practical perspective.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.347-349
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• 2014

Model verification and validation (V&V) is a current research topic to build computational models with high predictive capability by addressing the general concepts, processes and statistical techniques. The hypothesis test for validity check is one of the model validation techniques and gives a guideline to evaluate the validity of a computational model when limited experimental data only exist due to restricted test resources (e.g., time and budget). The hypothesis test for validity check mainly employ Type I error, the risk of rejecting the valid computational model, for the validity evaluation since quantification of Type II error is not feasible for model validation. However, Type II error, the risk of accepting invalid computational model, should be importantly considered for an engineered products having high risk on predicted results. This paper proposes a technique named as the response-adaptive experimental design to reduce Type II error by adaptively designing experimental conditions for the validation experiment. A tire tread block problem and a numerical example are employed to show the effectiveness of the response-adaptive experimental design for the validity evaluation.

• 대한안전경영과학회지
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• 제13권4호
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• pp.91-100
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• 2011

Main motivation for this study was to identify the relationship between high-risk hospital jobs and their symptoms associated. This study has three objectives; 1) Evaluate major jobs of hospital workers based on Criterion(Notification number 2003-24 from Ministry of Labor in Korea) for high-risk musculoskeletal disorders(MSDs), 2) Relate each jobs in criterion and the hospital jobs considered in this study, 3) Relate each jobs in criterion and MSDs symptoms of hospital workers. A total 141 hospital jobs was evaluated. Specifically, a total 688 hospital workers participated in the questionnaire survey in this study. There were two most jobs belonged to the numbers 2 and 4 from criterion. Most hospital workers participated in this study thought that the numbers 1 and 2 from criterion were associated with their jobs. In terms of MSDs symptoms, the numbers 1 and 2 from criterion were associated with their jobs as well. Further study for hospital jobs should be focused on breaking down quantification levels of each numbers in the criterion due to its atypical and non-repetitive job characteristics of hospital jobs.

• Nuclear Engineering and Technology
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• 제50권8호
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• pp.1234-1245
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• 2018

The risk of multi-unit nuclear power plants (NPPs) at a site has received considerable critical attention recently. However, current probabilistic safety assessment (PSA) procedures and computer code do not support multi-unit PSA because the traditional PSA structure is mostly used for the quantification of single-unit NPP risk. In this study, the main purpose is to develop a multi-unit Level 2 PSA method and apply it to full-power operating six-unit OPR1000. Multi-unit Level 2 PSA method consists of three steps: (1) development of single-unit Level 2 PSA; (2) extracting the mapping data from plant damage state to source term category; and (3) combining multi-unit Level 1 PSA results and mapping fractions. By applying developed multi-unit Level 2 PSA method into six-unit OPR1000, site containment failure probabilities in case of loss of ultimate heat sink, loss of off-site power, tsunami, and seismic event were quantified.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2020년도 학술발표회
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• pp.167-167
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• 2020

Annual sediment deposition in reservoirs behind weirs poses flood risk, while its accurate prediction remains a challenge. Sediment management by hydraulic flushing is an effective method to maintain reservoir storage. In this study, an integrated approach to predict sediment inflow and sediment flushing simulation in reservoirs is presented. The annual sediment inflow prediction was carried out with Artificial Neural Networks (ANN) modelling. RESCON model was applied for quantification of sediment flushing feasibility criteria. The integrated approach was applied on Sangju Weir and also on estuary of Nakdong River (NREB). The mean annual sediment inflow predicted at Sangju Weir and NREB was 400,000 ㎥ and 170,000 ㎥, respectively. The sediment characteristics gathered were used to setup RESCON model and sediment balance ratio (SBR) and long term capacity ratio (LTCR) were used as flushing efficiency indicators. For Sangju Weir, the flushing discharge, Q_f = 140 ㎥/s with a drawdown of 5 m, and flushing duration, T_f = 10 days was necessary for efficient flushing. At NREB site, the parameters for efficient flushing were Q_f = 80 ㎥/s, T_f = 5 days, N = 1, El_f = 2.24 m. The hydraulic flushing was concluded feasible for sediment management at both Sangju Weir and NREB.

• 융합정보논문지
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• 제11권8호
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• pp.84-91
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• 2021

21세기에 들어 급변하는 기후변화로 인한 풍수해 재해가 증가하여 건설현장에서의 침수사고가 증가하고 있다. 하지만 침수사고에 안전관리가 제대로 작동하지 않아 구체적인 저감 대책은 제시되고 있지 않다. 따라서, 본 연구에서는 굴착공사현장에서의 침수사고에 대한 침수양상을 해석하고 침수위험도 정량화 기법을 활용하여 위험등급을 구분하였다. 마지막으로 어골도를 활용하여 복합적인 침수원인을 도출하였다. 소규모 굴착공사 현장과 터파기 현장의 침수양상을 모의한 결과 굴착면을 타고 흘러 들어오는 유체에 의해 굴착면 내 침수심이 3 m를 초과하였다. 또한 굴착지점에 따라서 일시적으로 고유속이 발생하다 저류효과에 의해 감소하거나 10 m/s 이상의 고유속이 지속되기도 하였다. 이와 같은 침수 양상은 대부분의 작업자 혹은 모든 작업자에게 위험을 초래할 수 있는 수치이기 때문에 관리대책 미흡과 동시에 곱의 사상으로 발생한다면 치명적인 인명·재산 피해를 초래할 수 있었다. 이러한 재해 원인 고찰은 인명피해를 유발하는 침수사고에 대한 원인을 파악하여 사고 저감 대책을 제시할 때 도움을 줄 것으로 판단된다.

• 한국가스학회지
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• 제17권6호
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• pp.83-89
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• 2013

에너지 산업시설물은 다양한 종류의 가스나 유해물질을 다루고 있어 화재, 폭발, 독성물질 노출로 인한 대규모 중대사고로 전이되어 산업시설 종사자뿐만 아니라 외부 민간인에게도 치명적인 피해를 입힐 수 있다. 이러한 사고를 방지하기 위해 정량적 위험성평가를 활용하여 인체나 건물에 미칠 수 있는 영향에 대한 정량화를 시도하고 있지만 예외적인 상황에 즉각적인 처리가 어렵고 시나리오를 위한 전문가적 지식이 많이 필요하였다. 본 논문은 에너지 대규모 산업시설에서 실제 환경의 데이터를 실시간으로 이용함으로써 동적인 시나리오를 생성하여 예외적인 상황과 전문가적 지식을 최소화하고 개인 인지적 환경에 적합하게 위험을 표현하는 것이 목적이다. 이를 위해 본 연구는 실시간 정보를 기반으로 현 시점의 지역 내 위험도를 실시간으로 연산할 수 있는 데이터베이스와 증분적 모델을 적용한 지역기반 위험 분석 시스템을 설계하고 구현하였다.

• 한국안전학회지
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• 제35권1호
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• pp.87-96
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• 2020

The purpose of this paper is to develop a fire HRA (Human Reliability Analysis) procedure for full power operation of domestic NPPs (Nuclear Power Plants). For the development of fire HRA procedure, the recent research results of NUREG-1921 in an effort to meet the requirements of the ASME/ANS PRA Standard were reviewed. The K-HRA method, a standard method for HRA of a domestic level 1 PSA (Probabilistic Safety Assessment) and fire related procedures in domestic NPPs were reviewed. Based on the review, a procedure for the fire HRA required for a domestic fire PSA based on the K-HRA method was developed. To this end, HRA issues such as new operator actions required in the event of a fire and complexity of fire situations were considered. Based on the four kinds of HFE (Human Failure Event) developed for a fire HRA in this research, a qualitative analysis such as feasibility evaluation was suggested. And also a quantitative analysis process which consists of screening analysis and detailed analysis was proposed. For the qualitative analysis, a screening analysis by NUREG-1921 was used. In this research, the screening criteria for the screening analysis was modified to reduce vague description and to reflect recent experimental results. For a detailed analysis, the K-HRA method and scoping analysis by NUREG-1921 were adopted. To apply K-HRA to fire HRA for quantification, efforts to modify PSFs (Performance Shaping Factors) of K-HRA to reflect fire situation and effects were made. For example, an absence of STA (Shift Technical Advisor) to command a fire brigade at a fire area is considered and the absence time should be reflected for a HEP (Human Error Probability) quantification. Based on the fire HRA procedure developed in this paper, a case study for HEP quantification such as a screening analysis and detailed analysis with the modified K-HRA was performed. It is expected that the HRA procedure suggested in this paper will be utilized for fire PSA for domestic NPPs as it is the first attempt to establish an HRA process considering fire effects.

• 한국건축시공학회지
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• 제18권6호
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• pp.611-619
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• 2018

현재까지의 건설 안전관리와 리스크에 관한 연구들은 건설현장 내부(근로자)에 한정되어 있어 건설현장 외부(제 3자)에 대한 연구는 미비한 실정이다. 그 결과, 건설현장 주변의 일반인들이 피해를 받고 있으며 산재 다발이라는 부정적인 이미지로 언론이나 일반 대중들에게 투영되고 있다. 일반 대중들에게 부정적인 이미지를 탈피하기 위해서는 건설현장 내부(공종, 건축물)에만 집중되어있는 기존의 안전관리가 아닌 건설 현장 외부(제 3자)에 대해서도 고려된 종합적 안전관리체계를 구축해야 한다. 이에 본 연구에서는 건설 현장 외부(제 3자)의 인명사고 리스크를 정량화하고 몬테카를로 시뮬레이션을 활용하여 리스크가 어떻게 변화할 것인지 예측하고자 한다. 이를 위하여 첫째, 선행연구를 고찰하여 불안전한 상태와 인명사고 발생형태를 정의한다. 둘째, 14년 간 건설현장 외부에서 발생한 제 3자 인명 손해배상액 데이터를 수집한다. 셋째, 수집된 데이터의 사고내용을 분석하여 사고 발생분석 모델을 설정한다. 넷째, 리스크 정량화 모델을 구축하고 불안전한 상태, 인명사고 발생형태별 사고발생확률과 손해배상액 확률분포를 제시한다. 마지막으로 몬테카를로 시뮬레이션을 통해 도출된 사고 형태별 분포결과를 분석한다. 본 연구의 결과는 향후 건설현장 내 외부 안전관리 체크리스트 개발 및 인명사고 예측 관리 시스템 개발의 참고 자료로 활용될 것으로 기대된다.

• 한국환경보건학회지
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• 제36권5호
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• pp.391-401
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• 2010

A reduction in risk of occupational exposure to chemical hazards within the workplace has been the focus of attention both through industry initiatives and legislation. The aims of this study were to develop an exposure matrix by industry and process, and to apply this matrix to control the risk of occupational exposure to Dichloromethane (DCM). The exposure matrix is a tool to convert information on industry and process into information on occupational risk. The exposure matrix comprised industries and processes involving DCM, based on an exposure database provided by KOSHA (the Korean Occupational Safety and Health Agency), which was gathered from a workplace hazards evaluation program in Korea. The risk assessment of the exposure matrix was performed using Hallmark risk assessment tool. The results of the risk assessment were indicated by a Danger Value (DV) calculated from the combination of hazard rating (HR), duration of use rating (DUR), and risk probability rating (RPR) of exposure to the chemical, and were divided into four control bands which were related to control measures. The applicability of the risk assessment of the exposure matrix was evaluated by a field study, and survey of the employees of the exposure matrix groups. Among 45 industries examined, this study found that greater attention should be paid to two industries: the manufacture of other optical instruments and photographic equipment, and the manufacture of printing ink, and to one process among 47 examined, the packing process in the manufacture of printing ink, because these were regarded as carrying the highest risk. This tool of a risk assessment for the exposure matrix can be applied as a general exposure information system for hazard control, risk quantification, setting the occupational exposure limit, and hazard surveillance. The exposure matrix includes workforce data, and it provides information on the numbers of exposed workers in Korea by agent, occupation, and level of exposure and risk.