• Journal of the Korean Society of Systems Engineering
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• v.6 no.1
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• pp.1-13
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• 2010

KC-100 is a 4 seats, single piston engine, civil aircraft whose type certificate is applied for KAS 23 (FAR 23) for the first time in Korea. Its system safety assessment and analysis have been conducted to meet the minimum safety requirement in KAS 23 and to verify the safety of equipment, system, and installation in accordance with the requirement of ${\S}$23.1309 and the guidelines in FAA AC 23.1309-1D and SAE ARP 4761. This safety assessment begins with the FHA (Functional Hazard Assessment) at aircraft and system level in preliminary design phase, and all of the safety assessment and analysis reports including the preliminary version of SSA (System Safety Assessment) have been prepared during detail design phase. The revised version of these safety reports will be approved by Airworthiness Authority through the ground and flight test phases. In this paper, the safety assessment requirement in ${\S}$23.1309, safety assessment guideline in AC 23.1309-1D, and safety assessment and analysis methods in ARP 4761 will be explained based on the application example for KC-100 development. The experience and knowledge of this system safety assessment for civil aircraft can be applied to commuter aircraft of FAR 23 class or large transport airplane of FAR 25 class.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.890-898
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• 2022

Dispersion of suspended sediment, caused by coastal and marine development, is a key item in assessing marine environmental impact as it adversely affects marine life by increasing the level of turbidity and decreasing the amount of sunlight in seawater. However, its estimation has not been reliable because of the absence of a standard for the data measurement and divergent approaches to the impact assessment. In this study, we examined the estimation models from 58 Marine Environmental Impact Statements (MEISs, 2012-2014) to identify the gaps in the assessment and devise ways of improving the estimation. We developed four index items-grid system; unit load, particle size, and settling velocit-to evaluate their reliability in the estimation. The mean reliability score of each index was overall low-25 for grid system, 60 for unit load, 34 for particle size, and 17 for settling velocity. To ensure high reliability, it is important to develop a standard guideline that defines precise measurement of suspended sediment for unit load and settling velocity by particle size, followed by a grid system with compatible size for modelling. This can improve the estimation and thus underlie coherent impact assessment of suspended sediment dispersion on marine environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.215-225
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• 2021

The purpose of this study was to empirically verify the correlation between the characteristics of safety officers and managers handling disaster and safety management, competence, and performance among disaster and safety work-level officers in medium-sized companies in South Korea. For this study, the researcher surveyed 509 disaster and safety management officers of various companies and analyzed the resultant data. The results of the analysis showed that, first, the characteristics of the safety officers handling the disaster and safety management systems had a significantly positive impact on performance. Second, the characteristics of the safety officers handling the disaster management systems had a significantly positive impact on competence. Third, the disaster and safety management competence of the safety officers had a significantly positive impact on performance. Fourth, in the relationship between the characteristics of the safety officers handling the disaster and safety management systems of businesses and their performance, the competence of the safety officers had a mediating effect.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.12 no.4
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• pp.335-344
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• 2014

The safety case program has been prepared for the development of the disposal facility of low- and intermediate-level radioactive waste in Korea. For the development of the radioactive waste disposal facility, this program can be applied for the safety demonstration of the facility and for the safety judgment of development step based on the international standards and domestic development environment. Systematic safety approach of this program includes the safety strategies such as optimization, robustness, demonstrability and defense-in-depth principle which are based on the safety principle and objectives. From the quality of assessment basis, safety arguments focused on the uncertainty management and the confidence building can assure the disposal safety during the step-wise safety assessment.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.10a
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• pp.55-61
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• 1998

본 논문에서는 비밀성 메커니즘의 암호학적인 안전성에 대한 체계적인 분석을 통하여 난수열의 각종 암호학적, 통계적 성질에 기반한 평가 기법을 소개하고 이를 패키지로써 구현하였다. 본 패키지는 기존의 알려진 통계적 검정 기법들 뿐만 아니라 다양한 암호학적 특성에 기반한 검정 기법들을 종합적으로 분석하여 구현함으로써 차후 개발이 예상되는 새로운 스트림 및 블록 암호 알고리즘의 설계와 안전성 평가에 유용하게 적용될 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.66-72
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• 2019

To improve ride quality and running stability of high speed train(HST), it is important that connection between coaches adopts the articulated bogies by using a gangway ring, unlike the conventional independent bogies assembled with car bodies. Although the gangway ring should be ensured absolute safety against passenger movement between coaches during train operation, there is still a lack of quantitative durability criteria of that. Therefore, in order to improve the passenger safety of HST, it is important to study the test requirements on durability evaluation for the ring. In this study, seven mixed loading cases were derived from the triaxial loading(vertical/lateral/longitudinal) modes. The safety factor of each component is at least 2.4 or more from the results of the finite element analysis. In addition, fatigue safety was evaluated through durability analysis from the viewpoint of strain-life design. Durability tests for the gangway ring carried out a total of 10 million cycles in 4 phases load conditions. After the durability test, the defect of each component was investigated using nondestructive testing techniques.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.1
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• pp.79-92
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• 2019

In this paper, we propose a method to determine whether to install the accommodation facility of the multi-utility tunnel more effectively in the basic planning phase, and to set up an evaluation system to determine the configuration and kind of accommodation facility. For the configuration of the accommodation facility, 98 alternatives were analyzed for 7 accommodation facility. For the evaluation system of the accommodation facility, index related to feasibility and economic in basic planning phase were selected. The evaluation system classified as spatial, effective, and cost evaluation was presented reflecting the selected index, and AHP analysis was performed for weight setting. The results of this study will be helpful for users including designers to shorten the time and increase the efficiency in the process of determining accommodation facility of the multi-utility tunnel in basic planning phase.

• Journal of the Korean Society of Marine Environment & Safety
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• v.23 no.5
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• pp.462-472
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• 2017

Sunken vessels on major fairways can cause many problems in terms of maritime safety and the marine environment. In order to prevent secondary marine pollution accidents caused by sunken vessels, information on sunken vessels has been collected, a risk assessment has been conducted, and the relevant vessels are being managed according to the results of each assessment. However, there is still a demand for improvements. The most important of the improvement plans is a paradigm shift. In other words, the management of sunken vessels needs to be transformed according to a new paradigm to manage all sunken vessels within three years from the time of sinking. Legislative improvements are also needed for the reporting system for sunken vessels, risk assessment tools, the implementation of risk mitigation measures, and criteria for the implementation cost of risk mitigation measures. In addition, close coordination between marine pollution response and sunken vessel management efforts is needed. As the division of duties between the Korea Coast Guard and the Ministry of Oceans and Fisheries is vague, collaboration between the two ministries is required. Close collaboration is also needed between the departments of navigation safety management and sunken vessel management. Therefore, it is necessary to more clearly establish the relationship between the two systems and create a synergy effect between the two administrative operations using the results of the risk assessment in the Marine Environment Management Act to determine the navigational risk posed by obstacles with regard to the Maritime Safety Act.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2016.11a
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• pp.171-174
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• 2016

각종 크고 작은 재난이 반복되면서 안전에 대한 국민 요구가 증가하고 스스로 재난에 대비할 수 있는 역량을 제고할 수 있도록 생애주기별 안전교육의 필요성이 강조되고 있다. 국민은 각종 재난으로부터 안전하게 보호받을 수 있는 교육을 받을 기회가 거의 없기 때문에 국가적인 차원에서 국민에게 안전교육을 받을 수 있는 기회를 제공하고, 사업자가 영업행위를 함에 있어서 국민의 안전을 우선적으로 생각하고 보호해야하는데, 2016년 5월 19일 제19대 국회 본회의에서 '국민 안전교육 진흥 기본법'이 의결되어 2017년 5월 30일에 시행된다. 이 법은 안전교육기본계획 수립 시행, 안전교육에 대한 점검 평가, 안전교육 교재와 프로그램 개발 보급, 학교 다중이용시설 사회복지시설 등에서의 안전교육, 안전교육 전문 인력 양성 활용 등을 담고 있다. 이에 따라 현행 각종 안전교육에 관한 사항을 하나의 단일 법안에 규정해 종합적이고 체계적인 안전교육을 실시하고 지원할 수 있는 법적 근거가 마련됐다.

• Tunnel and Underground Space
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• v.5 no.4
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• pp.297-307
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• 1995

터널은 긴 선상구조물로서 사정조사결과와 다른 지질조건이 나타날 수 있으므로, 안전하고 합리적인 터널공사를 위해서는 시공중 지질조건에 적합한 지보설계를 실시하는 것이 필수적이다. 이를 위해서는 시공중 터널주변자반에 대한 정량적이고 공학적인 평가가 매우 중요하다. 그러나 시공중 암반을 평가하는 것은 매우 어렵고 조사자의 경험과 지식의 차이에 의해 평가정도가 크게 달라져 그 불합리성이 심화되고 있는 실정으로 터널주변암반에 대한 합리적인 평가방법이 절실히 요구되고 있다. 본 연구에서는 터널화상처리, GeoCAD, 역해석으로 구성된 평기시스템을 개발하였다. 본 시스템은 터널막장에서의 조사.시험 및 화상처리기법을 통하여 암반분류.평가를 실시하고, 터널주변 지반구조 및 굴착/지보과정의 3차원 모델링을 통하여 전방지질을 예측가능하게 하며, 터널계측자료의 역해석을 통하여 터널주변 지반의 물성을 정량적으로 평가할 수 있는 체계적이고 종합적인 평가시스템이다. 또한 이를 NATM 공법으로 시공되는 터널현장에 적용하므로써 본 시스템의 현장적용성을 검증하였으며, 이를 통해 적절한 지보공을 시공하여 터널의 안정성을 확보하고 합리적인 시공관리를 달성할 수 있었다.