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김문수(Munsoo Kim),서정수(Jungsoo Suh),이종호(Jong Ho Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The European design for the APR1400 reactor includes an ex-vessel device, so called Core Catcher, to retain molten core material that could potentially be discharged from the Reactor Pressure Vessel(RPV) if severe core damage event were to occur. The Core Catcher body made of carbon steel is to be placed inside the reactor cavity under a reactor vessel. The reactor cavity area modified in a rectangular shape will provide a surface area for spreading and heat transfer. Molten corium discharged from the reactor vessel is collected and spread inside the Core Catcher body. The cooling channel is made of a single channel between the Core Catcher body and inside wall of the reactor cavity. The width of the gap between the Core Catcher body and concrete body is designed to have enough flow rate. The gap size of cooling channel is maintained uniformly and the cooling channel also has an inclination angle to increase natural circulation.
스크린 필터 구조를 가진 Partial DPF의 PM 저감 특성
김충희(Chunghui Kim),김현철(Hyunchul Kim),이기수(Geesoo Lee),최정황(Jeonghwang Choi),전문수(Munsoo Chon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In this work, the 1 liter grade integrated metal DOC-DPF filter that can install in engine manifold was developed to investigate the effect of platinum-coating amount of filter on the improvement of filter activation temperature and reduction of particulate matter (PM). This filter was installed in 2.9 liter CI engine which meet the EURO-4 emission regulation. Tests for PM reduction efficiency and load condition of filter were conducted under ND-13 mode with full-load test condition. It was revealed that the time to reach the activation temperature of metal filter (280℃) was shorter as the amount of platinum-coating increased. This short activation time can be helpful for the reduction of CO and HC emissions during cold start condition. At the same time, PM was reduced as the coating amount increased. The reduction percentage of DOC40, DOC20, and DOC0 were 96.7% (2.34 ㎎/㎾’h), 95.1% (3.47 ㎎/㎾’h), and 94.5% (3.69 ㎎/㎾’h) compared to previous result (71.4 ㎎/㎾’h), respectively.
SI 단기통기관에서 PDA 밸브에 의한 배기 성능 특성에 관한 연구
김대열(Daeyeol Kim),한영출(Youngchool Han),백두성(Doosung Baik),김미수(Misoo Kim),주신혁(Pyongwan Park),박병완(Shinhyuk Jook),전문수(Munsoo Chon) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, our planet faced with very serious problems related to the air pollution and to the lack of energy resources. So, lots of researchers have studied to reduce the exhaust emission of Automobile that influenced the environment strong. Therefore. this paper was studied characteristics of emission performance by variation combustion chamber and PDA valve in single spark ignition engine. These studies in a spark ignition engine is one of the best solution for improvement of fuel economy and reduction of emission level. Two combustion chamber which have slightly different shaper in order to apply on SI single engine to improve combustion and to reduce emission gas. And PDA valve has been used to satisfy the requirements of sufficient swirl generation to improve combustion and performance to effect on flow profile on a combustion chamber. It is forced that injection timing, spark timing and intake air motion govern the stable combustion. Using the results of the test, the effects of the variable combustion chamber and PDA can be improved fuel consumption and be reduced exhaust emission.
디젤 엔진용 Metal DPF의 재생평형온도(BPT) 특성에 관한 연구
김충희(Chunghui Kim),김현철(Hyunchul Kim),이기수(Geesoo Lee),최정황(Jeonghwang Choi),전문수(Munsoo Chon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, a sample of the metal diesel particulate filter (MDPF) was fabricated, which was mounted on a 2.9 L mid-sized diesel engine to evaluate and analyze BPT and thus consider its application to actual diesel engine vehicles. The exhaust gas temperature on the front end of MDPF was changed at one hour interval from 20 ℃ to 30 ℃, and the resulting differential pressure and back pressure characteristics of the filter were analyzed. The international sample and D and K type samples were used for the evaluation, which were classified according to the filter structure. The BPT of the filter were 362 ℃ for the international sample, 350 ℃ for the D type sample, and 336 ℃ for the K type sample. Considering the actual vehicle temperature frequency for each section in prior studies, the results satisfied the regeneration condition in all sections other than the crowded downtown sections.
김문수,정지운,홍옥란,임형문 한국심리학회 한국심리학회지 생물 및 생리 Vol.13 No.1
본 연구의 목적은 능동적 회피반응에 잘 숙달되면 조건자극(CS)에 대한 공포가 감소되는가를 검토하는 것이었다. 조건공포의 측정치로는 CS의 제시에 대한 전반적 활동성의 변화에 바탕한 억압비를 사용하였다. 실험 1에서는 흰쥐들에게 불빛 CS와 전기충격 US를 1, 3, 9, 또는 27회 짝지어 제시하여 고전적 조건형성을 시켰는데, 조건형성시행을 많이 경험한 집단일수록 CS에 대한 조건공포가 컸다. 실험 2에서는 3, 9, 또는 27회 연속회피반응이 나올 때까지 능동적 회피학습을 시켰는데, 이런 회피학습의 정도와 상관없이 CS에 대한 조건공포의 강도는 세 집단 사이에 유사했다. 동물이 회피반응에 잘 숙달되어도 CS에 대한 조건공포가 감소되지 않는다는 본 연구결과는 기존의 결과와 상반되는 것으로서, 이러한 불일치를 설명할 수 있는 가능한 원인들을 논의하였다. The present study examined whether conditioned fear to a CS would decrease after extensive active avoidance training. Suppression ratios calculated from the change of general activity induced by CS presentation in an activity box were used as a measure of conditioned fear. In experiment 1, rats received classical conditioning by pairing a light CS with footshock US 1, 3, 9, or 27 times and were tested for conditioned fear. The more conditioning trials the animals received, the higher the conditioned fear to the CS. In experiment 2, animals received 15 active avoidance training trials on day 1 and assigned to 3 groups based on their performance. On day 2, they were trained to a criterion of 3, 9, or 27 consecutive avoidance responses, and one day later, tested for conditioned fear to the CS. All three groups showed similar degree of conditioned fear. This result indicating that extensive active avoidance training does not decrease conditioned fear to the CS is not consistent with the results of most of the previous studies, and possible reasons for this discrepancy is discussed.