• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.115-116
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• 2022

자율운항선박 원격제어시스템 구현을 위해서는 통신네트워크의 활용은 필수적이다. 하지만 현재 VSAT, LTE, WIFI를 활용한 통신네트워크의 방해요인중 하나는 시간지연이다. 다양한 연구를 통해 시간지연의 측정과 감소를 위한 연구가 진행중에 있다. 본 연구에서는 이러한 시간지연에 따라 항해사의 제어형태를 파악하기 위한 준비단계로 해양사고 재결서를 통해 분석한 결과를 바탕으로 시나리오를 개발하여 시뮬레이션을 통한 선박조종성능 만족도 평가를 시행하였다. 향후 이를 바탕으로 시간지연에 따라 원격제어자에게 선박조종성능을 저해하는 요인을 식별하고 이를 제거 및 방지하기 위한 방법에 대해 제안하고자 한다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.22 no.7
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• pp.791-799
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• 2016

The purpose of this work is to analyse the impact of new accident risks on maritime safety in Korea. The new accident risks have been induced from new/rare or unprecedented events in world maritime transportation, as identified by 46 experts in the previous study. To measure the impact of these new accident risks on maritime safety in Korea, the statistical accident data reported by the Korean Maritime Safety Tribunals (KMST) has been used for calculation, and the concept of Risk Index (RI) = Frequency Index (FI) + Severity Index (SI)established in a Formal Safety Assessment (FSA) by the IMO has also been introduced. After calculating two kinds of weight for FI and SI from the statistical accident data, high ranked scenarios were identified and their relationships between new risks and these scenarios were analysed. The results from this analysis showed, the root cause of the top-ranked scenario to be "developing high technology", which leads to "shorten cargo handling time". These results differed from optimum RCOs such as "business competition" and "crewing problems" which were identified in the previous study.

• Science of Emotion and Sensibility
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• v.4 no.2
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• pp.33-38
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• 2001

This analysis has been projected as a preliminary analysis to develop the therapy program for people who is suffering from stress disorder after car accident such as sense of fear or anxiety using virtual reality. The analysis verified the effect of driving scenario which is core technology of stress disorder program and of anxiety reduction training such as relaxation training through clients. The relaxation training has been tested to 8 people; 7 normal and 1 sufferer from car accident presenting them 3 different types of driving scenarios. As a result, relaxation training was effective but, it was not statistically good enough although it showed incensement of uneasiness by each different driving scenario. In spite of normal clients, it is interesting that anxiety lever after relaxation training using VR is lowered, but this result need to verify to client suffering real car accident.

• Journal of the Korean Society of Marine Environment & Safety
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• v.23 no.6
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• pp.661-668
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• 2017

The purpose of this study is to analyze the chemical reaction pathway for explosion accident of mixed cargo. The analysis used a structural scenario using event-tree analysis. Structural scenarios were constructed by estimating various chemical reaction paths in the content of the mixed cargo accident recorded in the written verdict. The analytical method was applied to three kinds of analysis: chemical analysis based on chemical theory, quantitative analysis using chemical reaction formula, and probabilistic analysis through questionnaire. As a result of analysis, the main pathway of the accident occurred in three ways: the path of explosion due to the reaction of concentrated sulfuric acid with water, the path of explosion due to the reaction of metal and mixed acid, and the path of explosion by synthesizing with special substances. This result is similar to the path recorded in the validation, and it leads to thar the proposed path analysis method is valid. The proposed method is expected to be applicable to chemical reaction path estimation of various chemical accidents.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.6
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• pp.83-89
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• 2021

With the recent development of information and communication technology, there have been many attempts to apply various IT technologies in the railway field. Until now, the safety control system has been installed at the site and operated using actual data, but there is a problem that it is difficult to verify the function of the railway safety control system in that no accidents occur in real situations. In this study, accident data is generated randomly to verify that the safety control system is functioning properly, and to this end, simulation data is prepared according to the simulator, accident scenario and scenario. Real-time railway safety monitoring system collects and transmits data from interface devices to common protocol called DDS.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2008.11a
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• pp.195-196
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• 2008

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2015.10a
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• pp.539-540
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• 2015

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.17-19
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• 2014

해양사고 발생 직후 2차적인 피해로의 확산을 방지하기 위한 조치로 사고선박을 안전한 장소로 이동하게 된다. 사고선박의 크기와 상태 그리고 해상조건을 고려하여 예선의 크기와 척수가 결정된다. 이 과정에서 사고선박의 선체저항을 계산하게 되는데, 기존의 이론식을 적용하여 계산하고 이에 대한 검증 단계로 예인실험을 실시하였다. 대상선박은 목포해양대학교 실습선 새유달호이며, 장력계, 외력 측정장치 등 실험장치는 실습선에 탑재하여 계측하였다. 실험장소는 목포해양대학교 인근 묘박지이며, 당시 풍속은 7m/s, 조류는 0.7m/s 전후이었으며, 횡방향 예인, 전방 2척 예인, 전 후방예인, 프로펠러고착, 예인속력의 변화 등 다양한 시나리오에 대하여 실험을 실시하였다. 장력의 계측은 예선의 예인삭을 사용하였으며, 실습선 선수미 비트에 장력계를 연결하여 측정하였고, 장력계의 최대측정 범위는 20톤을 사용하였다. 예인속력은 정지에서 3m/s까지 단계적으로 증가시키면서 해당 속력별 장력을 계측하여 속력증가에 따른 예인력을 확인하였다. 최종적으로 이론계산 결과와 실선실험 결과를 상호 비교하여 이론계산식의 유효성을 검증하였다.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.181-188
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• 2019

The purpose of this study is to implement the convergence thinking in problem-based learning (PBL) on paramedic education. PBL scenario course was conducted for 78 students in the third year of emergency medical technology during the first semester of 15 weeks in 2017. After 15 weeks, data of 73 students were analyzed. Among questions about learning interest in PBL, 'neutral' was the most frequent response with 38% for "PBL scenario classes were more effective in learning and acquiring knowledge than lecture class". For "The lessons learned in the class helped to improve the ability to come up with appropriate solutions for problem solving", 57.5% responded 'agree', and for "The lessons learned in the class helped with confidence in the emergency scene", 50.7% responded 'agree'. PBL will be an effective and efficient way of teaching as a learning curriculum for understanding the field situation.

• Congress of the korean instutite of fire investigation
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• 2011.04a
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• pp.137-160
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• 2011

본 사고분석을 통해 154 kV 절연부싱에서의 폭발사고에 대한 원인을 규명하였다. 결과적으로, 절연부싱의 사양은 국제표준에 적합하였다. 사고당일 기록된 자료에 의하면 R상과 S상에서 거의 동시에 지락사고가 발생하였으며, 지락지속시간은 약 75 ms로써 사고의 영향을 준 시간은 약 67 ms인 것으로 나타났다. R상은 아크에 의한 탄화 흔적, S상은 아크에 의한 탄화흔적과 외부열에 의한 탄화흔적, T상은 외부열에 의한 탄화흔적, 용융흔적은 R상과 S상의 케이블접속부와 플랜지에서 각각 발생하였다. S상의 절연부싱을 이용하여 탄화패턴 중 아크에 의한 것과 일반 열에 의한 것을 분류하여 연면방전이 발생한 것을 입증하였다. 사고추정 시나리오는 현장조사과정에서 나타난 현상과 목격자 진술, 사고원인 분석자료 등을 토대로 하여 작성되었다. 따라서 사고추정을 통해 분석된 자료는 아크생성단계, 열폭주 단계, 폭발단계, 화재단계로 구성하였다. 사고원인 가능성은 사고의 원인, 형태, 영향을 통해 나타난 연결고리를 검토하여 가능성이 낮은 부분을 배제하는 방식으로 진행되었다. 절연부싱의 사고원인은 표면의 오염물질 부착 가능성이 가장 높았다. 이를 근거로 하여 제조, 시공, 관리적 측면에서의 방지대책을 고려하는 것이 바람직할 것으로 판단된다.