• 대한교통학회지
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• 제28권3호
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• pp.39-49
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• 2010

본 연구에서는 감성공학적 분석방법론을 이용하여 운전자가 감성적인 측면에서 효과적으로 반응할 수 있는 교통안전 경고정보 제공방식 도출을 위한 연구를 수행하였다. 교통안전 경고정보는 운전자에게 전방의 위험요소를 미리 알려주어 사고회피를 위한 적절한 반응을 유도하는 역할을 하며 네비게이션과 같은 차내단말기를 통해 제공될 수 있다. 경고정보는 정보 제공방식들의 조합으로 구성되며 9개 시나리오를 설정하고 두 번의 설문조사를 시행하였다. 의미미분법, 상관분석, 수량화I류 이론을 이용한 감성공학I류 분석방법을 통해 연구를 진행하였으며, 성별차이에 따른 운전자 감성특성을 분석하였다. 분석결과 성별차이에 따라 각 정보의 제공방식에 대해 운전자가 느끼는 감성정도가 전체적으로 차이가 나는 것으로 분석되었다. 제공방식의 조합은 '청각적 요소: Beep음+음성안내', '메시지창: Text+픽토그램', '배경점멸: 빨간색 점멸'이 운전자의 감성정도와 선호도가 높게 나타났다. 본 연구의 결과는 운전자의 감성특성을 고려한 효과적인 교통안전 경고정보 설계 및 제공을 위한 유용한 자료로 활용될 것으로 기대된다.

• 제어로봇시스템학회논문지
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• 제15권8호
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• pp.823-830
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• 2009

For developing automotive parts and telematics devices the real car test often shows limitation because it needs high cost, much time and has the possibility of the accident. Therefore, a Vehicle Driving Simulator (VDS) instead of the real-car test has been used by some automotive manufactures, research centers, and universities. The VDS is a virtual reality device which makes a human being feel as if one drives a vehicle actually. Unlike actual vehicle, the simulator has limited kinematic workspace and bounded dynamic characteristics. So it is difficult to simulate dynamic motions of a multi-body vehicle model fully. In order to overcome these problems, a washout algorithm which restricts workspace of the simulator within the kinematic limits is needed, and analysis of dynamic characteristics is required also. However, a classical washout algorithm contains several problems such as time delay and generation of wrong motion signal caused by characteristics of filters. Specially, the classical washout algorithm has the simulator sickness when driver hardly turns brakes and accelerates the VDS. In this paper, a new washout algorithm is developed to enhance the motion sensitivity and improve the simulator sickness by using the vehicle tilt signal which is generated in the real time vehicle dynamic model.

• 해양환경안전학회지
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• 제14권1호
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• pp.71-76
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• 2008

남해안은 우리나라 전체 항만의 입항척수의 58.1%출 차지하며, 위험화물 운반선의 척수를 기준으로 할 경우 68.9%를 차지하여 통항위험에 노출되어 있다. 따가서 남해안 주요항만에 입출항하는 선박의 교통량과 흐름을 조사하여 교통환경스트레스 모델을 적용하여 해역별 위험도를 평가하고, 위험도와 해양사고 및 입출항 척수와의 관계 분석을 통해 주요항만의 문제점과 해결책을 마련할 기초자료를 제시하고자 한다.

• 한국콘텐츠학회논문지
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• 제13권11호
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• pp.807-814
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• 2013

건강관리 및 만성질환관리에 강점을 보이는 한의학의 중요성이 커지고 헬스 커뮤니케이션의 패러다임 변화를 수용한 새로운 한의정보 서비스에 대한 수요가 증대하고 있다. 이러한 변화를 한의학 분야에 확대 적용할 수 있는 방안을 도출하기 위해서 선행연구를 수집하여 헬스2.0의 개념과 서비스의 특징을 분석하고 국내의 한의정보 서비스의 장단점을 파악하였다. 이를 기반으로 인증된 의료정보를 유통하여 의료사고를 미연에 방지하고 의료정보의 가치를 높이며 개별적으로 생산되는 정보를 빅데이터 분석 기술을 활용하여 통합하고 새로운 정보를 추출하고 콘텐츠를 재생산할 수 있는 한의 헬스2.0 프레임워크를 설계하였다.

• 융합보안논문지
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• 제15권5호
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• pp.77-86
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• 2015

조직은 고객 정보 유출과 관련된 비즈니스 위험을 최소화하고, 자발적인 사전 검사를 통해 정보 보안 활동을 강화하고 부주의 방치 사고에 의한 개인 정보의 누출을 검출하는 방법을 발견해야 한다. 최근 많은 기업들이 정보유출방지솔루션을 도입하였으나, 업무산 필요에 의한 허용된 권한을 가진 내부 사용자에 의한 유출가능성이 존재한다. 이에 정보취급행위 및 활동에 대한 정보를 수집하여 분석할 수 있는 환경이 필요하다. 본 연구에서는 내부자의 활동 수준을 평가하기 위해서 RFM 모델을 응용한 SFI 분석기법을 활용, 실제 기업에 적용하여 사례 연구를 수행하였다.

• Nuclear Engineering and Technology
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• 제49권3호
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• pp.459-465
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• 2017

The goal of this study is to evaluate the effective thermal conductivity and diffusivity of containment walls as heat sinks or passive cooling systems during nuclear power plant (NPP) accidents. Containment walls consist of steel reinforced concrete, steel liners, and tendons, and provide the main thermal resistance of the heat sinks, which varies with the volume fraction and geometric alignment of the rebar and tendons, as well as the temperature and chemical composition. The target geometry for the containment walls of this work is the standard Korean NPP OPR1000. Sample tests and numerical simulations are conducted to verify the correlations for models with different densities of concrete, volume fractions, and alignments of steel. Estimation of the effective thermal conductivity and diffusivity of the containment wall models is proposed. The Maxwell model and modified Rayleigh volume fraction model employed in the present work predict the experiment and finite volume method (FVM) results well. The effective thermal conductivity and diffusivity of the containment walls are summarized as functions of density, temperature, and the volume fraction of steel for the analysis of the NPP accidents.

• 시스템엔지니어링학술지
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• 제16권2호
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• pp.67-77
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• 2020

Traditionally nuclear thermal hydraulic and nuclear safety has relied on numerical simulations to predict the system response of a nuclear power plant either under normal operation or accident condition. However, this approach may sometimes be rather time consuming particularly for design and optimization problems. To expedite the decision-making process data-driven models can be used to deduce the statistical relationships between inputs and outputs rather than solving physics-based models. Compared to the traditional approach, data driven models can provide a fast and cost-effective framework to predict the behavior of highly complex and non-linear systems where otherwise great computational efforts would be required. The objective of this work is to develop an AI algorithm to predict the peak fuel cladding temperature as a metric for the successful implementation of FLEX strategies under extended station black out. To achieve this, the model requires to be conditioned using pre-existing database created using the thermal-hydraulic analysis code, MARS-KS. In the development stage, the model hyper-parameters are tuned and optimized using the talos tool.

• Nuclear Engineering and Technology
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• 제54권8호
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• pp.2771-2782
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• 2022

When assessing the radiological consequences of postulated accident scenarios, it is of primary interest to determine the amount of radioactive fission gas accumulated in the fuel rod free volume. The state-of-the-art semi-empirical approach (ANS 5.4-2010) is reviewed and compared with a mechanistic approach to evaluate the release of radioactive fission gases. At the intra-granular level, the diffusion-decay equation is handled by a spectral diffusion algorithm. At the inter-granular level, a mechanistic description of the grain boundary is considered: bubble growth and coalescence are treated as interrelated phenomena, resulting in the grain-boundary venting as the onset for the release from the fuel pellets. The outcome is a kinetic description of the release of radioactive fission gases, of interest when assessing normal and off-normal conditions. We implement the model in SCIANTIX and reproduce the release of short-lived fission gases, during the CONTACT 1 experiments. The results show a satisfactory agreement with the measurement and with the state-of-the-art methodology, demonstrating the model soundness. A second work will follow, providing integral fuel rod analysis by coupling the code SCIANTIX with the thermo-mechanical code TRANSURANUS.

• Nuclear Engineering and Technology
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• 제54권9호
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• pp.3347-3352
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• 2022

In 2013, the International Atomic Energy Agency (IAEA) changed the recommended maximum range of the Emergency Planning Zone (EPZ) to 30 km, and the Kori Nuclear Power Plant in Republic of Korea has also expanded the EPZ to 30 km, following the recommendation. As a result, metropolitan cities with a high population density are contained within the EPZ, and evacuating millions of people should be considered if the 30 km range of evacuation is to take place. This study proposes an evacuation plan using buses (public transportation) to transport people outside of the EPZ, quickly and efficiently. To verify the appropriate mode share ratio of buses that can guarantee the right of vulnerable road users and reduce traffic congestion, a model was built simulating the Kori Nuclear Power Plant in Ulsan Metropolitan City. The scenarios were established by changing the mode share ratio of buses and passenger cars by 10%. Considering a large-scale network analysis at the city level, a cell transmission model was applied to calculate the evacuation time in each scenario. The result shows that the optimal mode share ratio of buses is 40%, with a total evacuation time of 132 min, considering feasible bus fleets in Ulsan Metropolitan City.

• Nuclear Engineering and Technology
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• 제54권12호
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• pp.4585-4600
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• 2022

A pool scrubber is often used as a wet-type design to mitigate the consequence of a severe nuclear accident. While studies indicated higher decontamination performance of a deeper pool, utilizing a very tall pool can be problematic due to potential structural stability and water backflow issues. This study proposes, as an alternative to a single pool system, a pool scrubber system composed of serially connected multiple pools with lower heights. Since large fraction of aerosol removal takes place in the injection region, serially connected pool scrubber system is expected to enhance the overall decontamination capability of a pool scrubber system. To support the analysis of the proposed system's decontamination capability, a new computer model was developed in the study to describe the bubble size dependent effect on aerosol removal including the effect of pool residence time. The accuracy of the new model was examined against experimental data for its validation. The proposed scrubber system composed of serially connected multiple shorter pools is found to have much improved decontamination performance over the current single pool system design.