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Hyungseok Oh,Rohae Myung,Sang-Hyeob Kim,Eun-Hye Jang,Byoung-Jun Park 대한인간공학회 2013 大韓人間工學會誌 Vol.32 No.2
Objective: The aim of this study was to predict human performance time in finding objects on multi-display monitors using ACT-R cognitive architecture. Background: Display monitors are one of the representative interfaces for interaction between people and the system. Nowadays, the use of multi-display monitors is increasing so that it is necessary to research about the interaction between users and the system on multi-display monitors. Method: A cognitive model using ACT-R cognitive architecture was developed for the model-based evaluation on multi-display monitors. To develop the cognitive model, first, an experiment was performed to extract the latency about the where system of ACT-R. Then, a menu selection experiment was performed to develop a human performance model to find objects on multi-display monitors. The validation of the cognitive model was also carried out between the developed ACT-R model and empirical data. Results: As a result, no significant difference on performance time was found between the model and empirical data. Conclusion: The ACT-R cognitive architecture could be extended to model human behavior in the search of objects on multi-display monitors.. Application: This model can help predicting performance time for the model-based usability evaluation in the area of multi-display work environments.
기둥 측면 충돌에서의 WorldSID 더미 착좌 위치에 따른 어깨 상해치의 영향성 연구
오형석(Hyungseok Oh),박진용(Jinyong Park),김승진(Seungjin Kim),이양두(Yangdoo Lee) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
ENCAP(유럽 신차 안전도 평가)에서는 최근 측면 충돌 안전성 향상을 위해 기둥 측면 충돌시 시험조건을 29kph, 90도에서 32kph, 75도로 변경하였으며, 인체 모형 더미 또한 기존에 사용하던 EuroSID-2 를 생체 충실도(biofidelity)가 향상된 WorldSID(국제 측면 충돌 더미)로 변경하여 2015년부터 충돌시험 평가에 적용하고 있다. 인체 모형 더미가 변경되면서 그에 따른 상해치 기준도 바뀌게 되었는데, 기존 EuroSID-2 에서는 평가하지 않았던 어깨 상해치가 WorldSID에 추가되었고, 그 상해치가 일정 수준을 넘어서면 감점(Modifier)을 적용하도록 변경되었다. 기둥 측면 시험에서 더미 어깨는 도어 및 B-pillar 등의 차량 측면과 아주 가까운 위치에 있으며, 어느 부분에 어깨가 위치하느냐에 따라 충돌시 어깨 움직임이 달라지게 되므로, 본 연구에서는 어깨 위치 즉, 더미 착좌 위치에 따라 어깨 상해치가 어떻게 달라지는지 확인하는 과정을 진행하였고, 해석 모델을 바탕으로 한 충돌 시험에서 위치 변화에 따른 어깨 상해치의 개선을 확인할 수 있었다. 가슴 상해치 전체를 판단하는데 있어서는 어깨 및 흉부가 함께 고려되어야 하므로, 더미 위치에 따른 어깨 상해치 변화를 근거로 흉부 상해치 개선 연구가 추가적으로 진행된다면 기둥 측면 충돌에서의 가슴 상해치를 줄이는 연구에 도움을 줄 수 있을 것이라 본다.
북미 측면 충돌 시험 후석(後蓆)Data의 상관 관계 분석과 대응 방안
오형석(Hyungseok Oh),이호준(Hojoon Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The method of evaluating total vehicle safety of NA USNCAP Rating condition applied after 2010 has been changed for evaluating vehicles by giving weight to the result of the each evaluate rating from the Frontal, Side MDB, Side Pole, Rollover test. Therefore, the strategy of enhancing total safety of certain vehicle is needed to be changed with verifying the difference of vehicle crash characteristics. Even though injury of the Dummy on the 2<SUP>nd</SUP> row is one of the important roles in rating of side performance, in order to reduce the product cost, the trend of the safety restraints applied to the relatively small vehicle has been changed for applying the curtain airbags but the side airbags in the 2<SUP>nd</SUP> row. In this case, 2<SUP>nd</SUP> row performance of the side MDB will be affected by only the characteristic of test vehicle because of the absence of restraints to absorb the crash energy delivered to the ATD.
Oh, Sumi,Lee, Chankyu,Kim, SungHwa,Choi, HyungSeok,Kim, Mi-Ja,Lee, JaeHwan Wiley (John WileySons) 2017 Journal of the American Oil Chemists' Society Vol.94 No.11
<P>Effects of deuteron (D+) and electron donors on the oxidative stability in linoleic acid-water model systems were evaluated by analyzing headspace oxygen content and headspace volatiles. Acetic acid-d and tetrakis(dimethylamino)ethylene (TDAE) were selected as a deuteron and an electron donor, respectively. Samples containing acetic acid-d had significantly lower headspace oxygen content than controls while those containing TDAE had significantly higher headspace oxygen content (p < 0.05). Combination of acetic acid-d and TDAE accelerated the consumption of headspace oxygen. Volatiles including t-2-heptenal, 2-octenal, or 2,4-octadienal had higher mass to charge ratio (m/z) of (molecular weight +1)/molecular weight in samples with deuterium oxide than in samples with deuterium free water. However, no significant difference was observed in the m/z ratio of (molecular weight +1)/molecular weight of those volatiles among samples with or without deuteron or electron donors. Also, lipid hydroperoxides with deuterium, were not found in samples containing deuterium oxide and acetic acid-d. Therefore, added acetic acid-d may not be involved on the formation of lipid hydroperoxides and volatiles directly.</P>
지형석(Hyungseok Ji),오형민(Hyungmin Oh),김명원(Myeongwon Jang),김종규(Jongkyu Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
세계 주요국가들은 선점식 해양이용에 따른 문제에 대응하기 위해 해양공간계획(Marine Spatial Planning)을 도입하였고, 국내에서도 이에 발맞춰 효율적인 해양공간관리를 위해 해양공간계획 및 관리에 관한 법률을 제정하여 2019년부터 시행하고 있다. 따라서 현행 해양공간계획 수립 이후 해양공간 통합관리 체제에 대한 가시적 분석이 필요하지만 효과적인 해양공간관리(Marine Spatial Management)와 성과평가가 가능한 해양공간 관리지표는 부족한 실정이다. 본 연구에서는 해양공간관리 효율성·접근성을 증진시키고 실수요 기반의 해양정책을 지속적으로 지원할 수 있는 관리지표를 제안하였다. 이를 위해 해양수산정보를 최대한 수집하여 8개 분야로 재분류하고 해양수산부 최신 정책추진 방향을 분석하여 해양공간관리에 대한 5개 비전을 도출하였다. 관리지표는 해양공간관리 비전별로 구분하여 해양수산정보 2개 이상을 융합한 변수/결과형으로 개발하였다. 본 연구결과는 효율적 해양공간관리를 위한 객관적이고 과학적인 근거자료를 구축하는데 활용하고자 한다. Major countries around the world have implemented marine spatial planning to cope with problems caused by preemptive use of the ocean, and in line with this, laws on marine spatial planning and management have been enacted and implemented since 2019. Therefore, a visible analysis of the integrated marine spatial management system is needed after the current marine spatial planning was established, but marine spatial management indicators for effective marine spatial management and performance evaluation are insufficient. In this study, management indicators were proposed that can improve the efficiency and accessibility of marine spatial management and continuously actual demand-based marine policies. To this end, marine and fishery information was collected as much as possible, reclassified into 8 fields, and 5 visions for marine spatial management were derived by analyzing the latest policy direction of the Ministry of ocean and Fisheries. Management indicators were classified by marine spatial management vision and developed in a variable/result type in which two or more marine and fishery information were fused. The result of this study are intended to be used to build objective and scientific evidence for efficient marine spatial management.
강형석(Hyungseok Kang),최성만(Seongman choi),오성환(Seonghwan Oh) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
본 수치해석 연구는 초음속 항공기에 적용되는 이차원 축소-확대 노즐의 기계적인 피치 편향각 변화에 따른 추력편향노즐의 특성을 이해 하고자 수행 되었다. 수치해석은 Fluent를 이용하여 진행되었으며 해석결과는 동일한 조건에서의 실험결과와 비교검토 하였다. 노즐의 피치 편향각은 0° 와 20°로 각각 설정하였으며 피치 플랩의 길이를 노즐 출구 높이의 0.5배에서 2.5배까지 설정하여 피치플랩의 길이에 따른 편향효율과 유동특성을 분석하였다. 연구결과 피치플랩의 길이에 따라 피치추력의 변화가 크게 나타났으며, 이러한 피치추력변화는 피치플랩 길이비의 변화에 따라 노즐 내부에서 발생하는 충격파의 상호간섭현상에 의해 좌우됨을 알 수 있었다. A numerical analysis has been conducted to determine the pitch thrust vectoring characteristics of a two-dimensional convergent divergent exhaust nozzle for supersonic aircraft application. The numerical analysis was done by Fluent and verified by the experimental test result. The analysis was performed with pitch angle of 0° and 20° each at the ambient temperature condition. To see the effect of a ratio of pitch flap length and pitch flap height, the ratio was varied from 0.5 to 2.5. The numerical analysis show that pitch thrust is changed much with pitch flap length. The big differences of the pitch thrust with pitch flap length is due to the shock interaction in the nozzle.