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RISS 인기검색어
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- 저자 : 한봉훈(Bonghoon Han) (검색결과 5 건)
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한봉훈(Han Bonghoon),민세홍(Min Sehong) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.6
일반적인 건물화재에서 연소 확대의 주 위험은 각 실의 가연물뿐만 아니라 실내 마감재의 표면연소 확산 위험이다. 이러한 이유로 건축관련 법령 및 소방관련 법령에서 건축물 내장 재료의 난연 성능시험방법 및 성능 기준 등을 정하고 있다. 본 연구에서는 최근 단열 및 미관 등의 장점을 내세워 벽지 개념으로 널리 사용하고 있는 폼블럭에 대하여 건축 재료의 화염전파시험(KS F 2844: 2002)을 통하여 화재특성을 분석 연구하였다. 시험 결과 폼블럭은 조정판 홀더를 제거하고 시험체를 시험 위치에 삽입하자 1초(s) 에서 5초(s) 사이에 착화되어 급속하게 연소하였고, 시편(길이 800 0 -5 mm, 나비155 0 -5 mm)의 끝까지 최소 483초(s), 최대 796초(s)에 걸쳐 연소하였다. 최대 열방출률은 시험 시작 후 평균 36초(s)에, 4.038 ㎾/㎡를 나타내었다. 이러한 시험결과를 살펴보면 폼블럭은 화재시 급격한 연소 확대가 우려되므로 불특정 다수인이 이용하는 다중이용시설뿐만 아니라 주택에서도 사용을 자제하여야 하며, 폼블럭을 전기용품 및 생활용품 안전관리법상의 벽지에 포함시켜 「공급자적합성확인대상 생활용품」의 안전기준을 충족할 수 있도록 규제하여야 하겠다. The main risk of combustion expansion in normal building fires is the risk of surface combustion spread of the interior finish as well as combustibles in each room. Therefore, relevant laws and regulations have set the performance test methods for flame retardants and performance standards for building interior materials. In this study, the fire characteristics of foam blocks are analyzed through the flame propagation test of building materials (KS F 2844: 2002). From the result of the test, it was observed that the foam block was ignited between 1 s and 5 s after the specimen was inserted into the test position and burned rapidly. The specimen was burned for at least 483 s and a maximum of 796 s to the end of the specimen (800 0 -5 mm, width 155 0 -5 ㎜). The maximum rate of heat release was 4.038 kW/m² at an average of 36 s after the start of the test. As observed from the result of the test, the foam block should be used not only in the multi-use facilities used by the unspecified majority but also in residences because of the sudden increase in the combustion in case of fire. The foam block should be included in the wallpaper of the electric appliances and also in the household goods safety management law to satisfy the safety standards of household goods.
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흡배기 밸브타이밍이 가솔린엔진의 부분부하 성능에 미치는 영향
이원근(Wongeun Lee),한봉훈(Bonghoon Han),김우태(Wootai Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The potential benefit of dual CVVT was investigated by changing the exhaust valve timing in an intake CVVT engine. Intake/exhaust valve timing affects greatly on the part load performance by the combined effect of increased overlap, late intake valve closing timing, and park load knocking tendency. Pumping loss was reduced more effectively by exhaust cam phasing than intake can phasing. It is shown that there are many additional benefits of both intake/exhaust cam phasing over intake cam phasing only. Brake specific fuel consumption level was improved by about 2%, and addition reduction of about 30% in NOx emission was observed due to increased internal exhaust gas recirculation. Some potential reduction of hydrocarbon emission was also observed.
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엔진 초기 개발 단계에서의 Water Jacket 형상 최적화에 관한 연구
김영남(YoungNam Kim),한봉훈(BongHoon Han),김우태(WooTae Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The flow patterns in the water jacket passage were scrutinized using computational fluid dynamics method. Using the flow patterns in the water jacket passage and the sectional distributions of mass flow rate and Head pressure resistance, the geometric optimization has been performed for the water jacket passage. Geometric influences on the flow patterns in water jacket were easily investigated. With the optimization of water jacket passage, the uniform mass flows in the cooling water passage between exhaust ports which is crucial for the engine head cooling system were obtained. It was possible for the geometric optimization of the cooling system in the early stage of engine design.<br/>
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배기계 내구시험 중의 온도변화 simulation process 개발
이원근(Wongeun Lee),박상준(Sangjoon Park),한봉훈(Bonghoon Han),김우태(Wootas Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Exhaust manifolds suffer from serious temperature variation during the thermal fatigue test. The spatial <br/> distribution of temperature changes at each moment Because transient flow can not be simulated during the long period of temperature change, the simulation can not be conducted by conjugate heat transfer analysis. In this study, a new procedure for transient thermal analysis is established by decoupling fluid-solid analysis. The procedure consists of (l) transient CFD calculation (2 cycle), (2) mapping heat transfer coefficient as a B.C of head conduction analysis and (3) transient heat conduction analysis in the long period (30 min). The realistic temperature change can be predicted by this procedure.<br/>
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가솔린엔진의 흡기유량계수와 포트설계인자의 상관성에 관한 연구
이시훈(Sihun Lee),손진옥(Jin-Wook Son),곽영홍(Young-Hong Kwak),한봉훈(Bonghoon Han),김우태(Wootae Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An Intake Port of SI engines plays a key role on improving engine performance by maximizing full load volumetric efficiency or by optimizing in-cylinder air motion. However, designing an intake port has been usually performed based on port experts' experience and know-how, which means that analytical analyses are relatively insufficient. In this paper, port design parameters which decide an overall port shape were defined in order to correlate them relevantly with flow test results accumulated so far. This was expected to be one of the analytical approaches for future port development.<br/> Test species were composed of all twenty eight SI engines which cover major engine displacements from 1,000cc to 4,000cc. First, they were tested on a steady state flow test rig to find out their flow coefficients. Secondly, those flow coefficients were analyzed based on the port design parameters measured form the engines. The port design parameters were chosen to be measured easily in the real cylinder head, and then re-arranged to be non-dimensional<br/> parameters for further correlation analyses. The most effective parameters are valve height, valve head diameter, and the ratio of port size and cylinder bore diameter. The final correlation equation could predict flow coefficients within 2% deviation.
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