자동차 촉매장치의 유동 특성에 관한 연구

박찬준,이상원 서울産業大學校 2000 논문집 Vol.51 No.2

The flow characteristics in a typical dual-monolith automotive catalytic converter were investigated using a computational simulation method. A non-reacting, adiabatic model was considered in the flow simulation. The monolithic brick resistance was formulated using the experimental pressure drop data. It was introduced as an additional source term into the non-dimensional momentum governing equation within the monolithic brick. The flow distribution within the catalytic converter was found to depend strongly on the diffuser angle. The diffuser angles were varied from 90˚ to 27˚ and a disk was inserted at inlet of diffuser. The inlet flow of catalytic converter was assumed as a uniform distribution and it was varied from 5.9 m/s to 29.5 m/s. A distribution index was formulated to quantify the degree of uniformity at test cases considered. When the angle of the diffuser was decreased from 90˚ to 27˚, the distribution index was increased from r=0.67 to r=0.78. The gap of between dual-monolith had a good effect on uniformity because the radial flow in the gap was increased. Also the disk which was inserted at inlet of diffuser could control the uniformity, but increased the flow restriction.

흡기포트 밸브주위의 유동특성에 관한 실험적연구

박찬준 서울産業大學校 1991 논문집 Vol.33 No.1

The objective of this research is to investigate the flow characteristics around the intake valve in S.I. engine. The experiments were conducted using hot-wire anemometry and impulse swirl meter in a steady flow rig. The three components of velocities at the curtain area of the intake valve and the swirl ratios are measured under a variety of intake port configurations, valve lifts and the positions of intake valve. It was found that the effect of port configuration on the velocity distribution around the intake valve is significant. The tangential velocity profiles in the helical port are independent to the variation of the valve lifts and the measuring positions. In direct port, the flow direction near the valve is same with the valve seat angle, when the valve lifts are 6mm and 3mm. The velocity profiles at the middle plane of the valve lift are not uniform in the direct port which has 15。 port angle, because of the flow momentum occurred by the curvature of port. The swirl ratios are increased when the eccentricity is increased, and those have the maximum values at 0。 orientation angle of port.

이탈리아 산업디자인의 텔레시스적 의미와 상관성 연구 : 초 일류 상품개발 기업을 중심으로

박찬준 계원조형예술전문대학 예술공학연구소 1996 계원논총 Vol.1 No.1

제품디자인은 지적 노력의 가치물로서 환경적응적 도구 이상의 내외적 텔레시스한 의미들을 발전시켜 나가고 있다. 즉, 문화적 역사성을 감성적 상징성으로 일류상품화에 성공한 시장지향적(Market Oriented Research) 이탈리아 제품디자인을 토대로 그 가치성을 인식하고자 한다. 본 연구는 문화 산업으로서 이탈리아 제품디자인의 텔레시스적 의미와 역할을 기초로 진행하였다. 또한 예술로서 이탈리아 디자인의 철학적 배경과 물적 이미지네이션을 다원적 코드로 발전시켜 성공한 자동차, 조명, 주방용품 외에 유리, 가구디자인 관련 기업들을 모델로 연구방향성을 좁혀 나갔다. 이탈리아 제품디자인의 텔레시스적 가치는 소유중심에서 사용중심, 나아가 종적, 횡적 양면적 가치를 수용하여 만족중심으로 부가가치의 척도를 새롭게 만들어 가는데 있다. 따라서 실용적 기능 가치와 신기술, 고성능에 가리워져 규정할 수 없는 인간 심성의 실험적 패러다임(Paradigm)을 정신세계의 미디어적 제품으로 전환시킨 이탈리아 디자인의 의미와 상관성의 이해를 돕고자 한다.

연료 조성에 따른 대체 연료의 공연비 산정법의 비교

박찬준,엄인용,이정만 서울産業大學校 2005 논문집 Vol.54 No.1

This paper is to compare the various Air-Fuel ratio determination methods for alternative fuels. In the previous work, expansion of Eltinge chart, unburned hydrocarbon compensation, comparison of the results from various methods were discussed. It has been also concluded that Eltinge method might be regarded as the most general equation, of AFR determination among the existing ones. In the recent years, however, increasing demand for the environmental preservation, including global warming-up protection, and energy conservation lead to introduce the alternative fuel to the internal combustion engine. Therefore, the exact calculations of AFR for these fuels are needed. Especially, for the fuel that contains oxygen, all AFR calculation equations except Eltinge have to be re-formulated. In this paper, the AFR for alternative fuel were calculated by re-formulated carbon balance, accuracy of which was already confirmed, and linear equations, which are newly proposed by statistical method for each fuel. The results show that AFRs based on carbon balance have a little more error compared with gasoline, however, the accuracy is enough for this formula to apply to various fuel. The proposed linear equation also have excellent accuracy up to X = 1.2.

불꽃점화기관에서 흡기포트 형상이 성능에 미치는 영향에 관한 연구

박찬준 서울産業大學校 1995 논문집 Vol.42 No.1

The present study is to investigate the effect of intake port shape on the performance of spark ignition engine. The experiments were conducted using an eddy current engine dynamometer and an impluse swirl meter in a steady flow rig. Three different shape intake ports were used. One had straight port and the others had helical ports. The swirl ratios of helical ports were 3.841, 5.442, respectively, when a SCV was closed. It was found that effect of port configuration on the performance in S.I engine is signficant. when the radius of throat in the port is increased, the power is increased in WOT, but that is decreased in part load conditions. The LML in case of helical port engine is larger than that of a standard engine because of straified flow condition and increased turbulent intensity. The NOx in a helical port engine is reduced by 50% than that in a standard engine, but the HC is increased slightly. when the direction of injection is changed from center to side, the performance of engine is increased in L2 engine.

12주간의 태권도 수련이 비만 어린이들의 신체조성, 골밀도 및 슬관절 근기능 발달에 미치는 영향

박찬준,김창환 한국스포츠리서치 2006 한국 스포츠 리서치 Vol.17 No.5

옥외 조명디자인의 미적 패러다임에 관한 연구 : 국내 리조트타운의 Lighting Fixture Design을 중심으로

박찬준 계원조형예술전문대학 예술공학연구소 1997 계원논총 Vol.2 No.1

Site and environment of outdoor lighting fixture design has physical, physiological and psychological impact. This is because medium known as light can open emotional breadth of human beings broadly with the language of light. Hence in this treatise the writer attempted to study esthetical paradigm of lighting fixture design in connection with control of light which is a motif for variety of human actions and empathy apparent in natural and architectural environment of outdoor resort town. Furthermore it is also attempted to identify symbolic images of conceptual analogy of outdoor lighting fixture design from the perspective of morphology. Practical items, being planned and developed by this writer with a view that outdoor lighting fixture design and creation of environment from the dimension of resort landscape promote spiritual contact between man and nature, were restructured as focus for solution of problems. Accordingly attempt was made to graft self-reflection on lighting fixture designs being installed in uniformity irrespective of site and environment to significance and order of environments in terms of time, place and sight. The significance of this study may be deduced from renewed awareness of importance of esthetical paradigm unique to outdoor lighting fixture design to heighten the quality of resort landscape.

기계번역 사후교정(Automatic Post Editing) 연구

박찬준,임희석 한국융합학회 2020 한국융합학회논문지 Vol.11 No.5

Machine translation refers to a system where a computer translates a source sentence into a target sentence. There are various subfields of machine translation. APE (Automatic Post Editing) is a subfield of machine translation that produces better translations by editing the output of machine translation systems. In other words, it means the process of correcting errors included in the translations generated by the machine translation system to make proofreading. Rather than changing the machine translation model, this is a research field to improve the translation quality by correcting the result sentence of the machine translation system. Since 2015, APE has been selected for the WMT Shaed Task. and the performance evaluation uses TER (Translation Error Rate). Due to this, various studies on the APE model have been published recently, and this paper deals with the latest research trends in the field of APE. 기계번역이란 소스문장(Source Sentence)을 타겟문장(Target Sentence)으로 컴퓨터가 번역하는 시스템을 의미한다. 기계번역에는 다양한 하위분야가 존재하며 APE(Automatic Post Editing)이란 기계번역 시스템의 결과물을 교정하여 더 나은 번역문을 만들어내는 기계번역의 하위분야이다. 즉 기계번역 시스템이 생성한 번역문에 포함되어 있는 오류를 수정하여 교정문을 만드는 과정을 의미한다. 기계번역 모델을 변경하는 것이 아닌 기계번역 시스템의 결과 문장을 교정하여 번역품질을 높이는 연구분야이다. 2015년부터 WMT 공동 캠페인 과제로 선정되었으며 성능 평가는 TER(Translation Error Rate)을 이용한다. 이로 인해 최근 APE에 모델에 대한 다양한 연구들이 발표되고 있으며 이에 본 논문은 APE 분야의 최신 동향에 대해서 다루게 된다.

가솔린 엔진에서 밸브 개폐시기 변화에 따른 엔진성능의 수치해석 연구

박찬준 서울산업대학교 산업대학원 1996 大學院論文集 Vol.4 No.-

The object of this research is to investigate the effects of valve timing on the performance of engine considered and develop the simulation model for performance and gas exchange processes in an internal combustion engine. The simulation model used the method of characteristic for gas dynamics in gas exchange process and the Wiebe function for power process. The simulation model was then used to find the effects of the valve timing of intake and exhaust valve on the performance of a gasoline engine. The engine speed was varied from 2000rpm to 5500rpm in W.O.T. It was shown that the performance of engine was increased in all engine speed range considered when the valve timing was 18/50/50/18 in case the valve open period of engine was same with standard valve timing. On the other hand, when the valve timing was 8/52/52/8 such as the overlap period of engine was decreased compared with the standard valve timing, the performance of engine was increased in low engine speed range and was decreased in high engine speed. It was also founded that the simulation model could be used to design the components of engine such as the length of intake and exhaust manifolds, the valve timing and the valve lift.

불꽃 점화 기관에서 점화 장치가 성능에 미치는 영향

박찬준 서울産業大學校 1994 논문집 Vol.40 No.1

This study is to investigate the effect of ignition system on performance in S.I. engine. The ignition systems considered were TCI(Transistorized ignition), CDI(Capacitive Discharge Ignition), and WJR ignition system which was combined CDI system and Full Transistor system. The spark plugs used were Bosch(WR8HP) and Champion(RC7YC). The gap sizes of spark plus were varied from 1.0mm to 1.8mm and coil system used were Poongsung, Daejun, Bosch, Lucas, Nipondenso. The mixture response tests were conducted in part load condition such as 2400 rpm and 2.4 bar BMEP. The NOx and HC emissions were measured to investigate the efficiency of combustion and misfire limit. The ignition timings were also measured. It was found that the misfire limit was increased when the gap size of spark plug was increased until 1.5mm. The WJR system had the higher misfire limit than that of CDI system because the spark energy of CDI system is strong but too short.