LPG 액상분사식 인젝터에서 후적에 의한 아이싱 특성 연구

박철웅,김창업,최교남,강건용,Park, Cheol-Woong,Kim, Chang-Up,Choi, Kyo-Nam,Kang, Kern-Yong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5

Since the liquid phase LPG injection(LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a dropping of LPG fuel but also icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of HC emissions. The experimental investigation was carried out on the bench test rig in this study. It was found that n-butane, that has a relatively high boiling point($-0.5^{\circ}C$), was a main species of droplet composition and also found that the droplet problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the an engine head temperature was increased, although a large amount of icing deposit was still observed in the case of $87^{\circ}C$. Also, it was observed that the icing phenomenon is improved by using anti-icing bushing.

배연가스의 $NO_x$제거용 코로나 방전장치에서 OH 발광 스펙트럼 측정 및 관련 반응 연구

박철웅,한재원,신동남,Park, Chul-Woung,Hahn, Jae-Won,Shin, Dong-Nam 한국연소학회 1999 한국연소학회지 Vol.4 No.1

We constructed a wire-cylinder type pulsed corona discharge system for $NO_x$ removal, which was operated in room temperature. A emission spectrometer was built with a boxcar averager and monochrometer equipped with photo-multiplier tube detector. The sensitivity of the emission spectrometer was greatly improved by synchronizing the emission spectrometer with pulsed corona discharge system using a triggered spark-gap switch. $N_2$ spectrum($c^3{\Pi}_u{\rightarrow}X^1{\Sigma}_g{^+}$) was measured in the range of 300 - 450 nm and oxidizing OH radical emission($A^2{\Sigma}^+{\rightarrow}X^2{\Pi}$) was measured in case $N_2$ was supplied with water bubbling. As wet gas composition of inlet $N_2$ supplied in the discharge system increased, the intensity of OH emission was increased and saturated at wet gas composition 50%. We also investigated additive effect of $C_2H_4,\;H_2O,\;H_2O_2$ on the intensity of OR emission and $NO/NO_2/NO_x$ reduction and analysed the related reaction mechanism in corona discharge process. $H_2O_2$ additive increased the intensity of OH emission and $NO/NO_x$ reduction.

인삼특작분야 산업현황 및 중장기 연구계획

박철웅(Churl Woong Park) 한국원예학회 2010 한국원예학회 학술발표요지 Vol.2010 No.10

LPG 액상분사식 인젝터의 후적 및 아이싱 특성에 관한 연구

박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi),강건용(Kernyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Since the liquid phase LPG injection (LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a post-accumulation of fuel but also an icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of harmful emissions. The experimental investigation was carried out on the bench test rig during this study. It was found that n-butane, that has a relatively high boiling point (- 0.5℃), was a main species of post-accumulation and also found that the post-accumulation problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the temperature of an engine head was increased, although a large amount of icing deposit was observed in the case of 87℃.

HD 드라마타운 유치에 따른 대전지역 영상산업의 발전 방안

박철웅 ( Chur Woong Park ),이종탁 ( Jong Tak Lee ) 한양대학교 현대영화연구소 2011 현대영화연구 Vol.7 No.1

Daejeon city`s film & video industry faces important opportunity to develop itself because the HD drama town was decided to be hosted in Daejeon city. However, unless the business of HD drama town helps the development of Daejeon city`s film & video industry, it`s success will be limited. Thus, the promotion policy for the regional film & video industry is the most important thing that should be set up for the HD drama town. Above of all, the protective policy for the regional film & video companies should be prepared as same time as making an active incubating system for them. The regional film & video companies should find the parts which they can work for before the real operation of HD drama town and make environment for it. Currently, Daejeon`s production supporting policy for films & dramas generates controversy because of selecting standard. It`s very significant thing to pay attention on because there will be much more cases after building HD drama town. In order to cease controversy about the present production supporting, the regional film & video commission should recover it`s own role and function. The production supporting policy should make standards which induces to make the works of regional culture and identity. At the end of it, the system which arranges regional infrastructures and produce works should be set up. Otherwise, unlike expectation for HD drama town, when it operate, the regional film&video industry will become the structure that makes products just following for orders from outside.

액상분사식 LPG엔진 익젝터의 후적 및 아이싱 특성에 관한 연구

박철웅 ( Cheol Woong Park ),김창업 ( Chang Up Kim ),최교남 ( Kyo Nam Choi ),강건용 ( Kern Yong Kang ) 한국분무공학회 2007 한국액체미립화학회지 Vol.12 No.1

연료분사기 및 점화플러그의 상대적 위치 변화에 따른 직접분사식 초희박 LPG 엔진의 연소 및 배기특성

박철웅(Cheolwoong Park),조시현(Seehyeon Cho),김태영(Taeyoung Kim),오승묵(Seungmook Oh) 한국가스학회 2014 한국가스학회 학술대회논문집 Vol.2014 No.6

알폰소 쿠아론의 롱테이크 미학

박철웅(Park Chur Woong) 한국영화학회 2010 영화연구 Vol.0 No.45

Alfonso Cuaron started his career in Hollywood film industry, had successful debut with his first film 〈Solo con tu pareja〉(1991)that was based on Hollywood classical form and gained fame with his film 〈Great Expectation〉 that was consist of contemporary film's main characters like rapid speed editing, free range camera movement and simple storyline. Afer then, he begin to form his own style with cinematographer Lvezki on 〈Yi tu mama tabien〉. That is longtake style. The longtake style is the style that early frontier like Orson Wells, Jean Renoir and Misikuzi Kenzi began to direct and arranged aesthetically by Andre Bazin. But, it's use have been reduced and Only certain art or independent film treate with it, nowdays. However, Alponso Cuaron dare to deal with it on his works. He developed his own longtake style based on traditional way. He followed the traditional longtake style in using frame depth and proceed the story by using of the layers of frame depth. In the same time, he created the continuous hand held longtake style which make spectators feel if they were in the frame and which complete editing by itself with ready_made choreography. The longtake style is the spot that Cuaron has met in his way to develop his own style without staying his success in Hollywood. It is different from the other foreign directors who used to be talented, and now just followed the way Hollywood system demand, finally was exhausted.

김기덕 감독 작품 분석

박철웅(Park Chur Woong) 한국영화학회 2005 영화연구 Vol.0 No.26

Kim, Ki-Duk, who directs 12 films from 1996, has been hot issued in Korea film industry and critics. Among those issues, The most critical one was sadomasochism in his works. However, his style on the works was not studied in detail, compared to the content. This theme's mayor is the stylistic analysis of his works. Here, I divide his works to three period, the first one is the period which follows the classic Hollywood style, The second one is which the transitional period which change to a poetic language and the last one is the period of a poetic language. The works in first period have common-things, regarding to the creation of cinematic space, the use of props which bring in oneself's ruin and peeping as narrative tool, director's romanticism. I can find Kim, Ki-duk's careful attitude to a world in 〈Spring, Summer, Fall, Winter and Spring〉. He doesn't conflict with it anymore. In stylistic term, the cuts become larger and longer, the beauty of character's movements appears and the montage between image and sound just starts in the work. 〈Samaria〉's last sequence which characterized the cars with a parenthood is the beginning of a poetic language. The period of a poetic language is 〈Empty house〉 and 〈The Bow〉. In 〈Empty house〉, main character deletes by himself to get one's love and it represents director's mature attitude compared to previous works. The director show main character' attempt which try to disappear and finally make him disappear, but viewers believe that he is still in frame. It is very remarkable cinematic method which nobody try before. The main character sacrificed by himself in 〈The Bow〉 and it means that his behavior for pure love reaches to religious realm. This work is full of metaphor and the metaphor attains a higher level. Kim, Ki-Duk's work becomes mythological and poetic language at last.

초희박 LPG 직접분사식 엔진에서 질소산화물 저감을 위한 배기재순환 적용성 평가

박철웅(Cheolwoong Park),조시현(Seehyeon Cho),김태영(Taeyoung Kim),조규백(Gyubaek Cho),이장희(Janghee Lee) 한국가스학회 2015 한국가스학회지 Vol.19 No.4

LPG가 수송용 연료로서 경쟁력을 유지하기 위해서는 지속적인 기술개발을 통해 휘발유와의 연비격차를 감소시키고 후처리시스템 등에 의한 가격 부담을 낮추어야 한다. 이에 본 연구에서는 안정적인 희박연소 구현을 통한 연비개선을 얻기 위해 실린더 중앙에 점화플러그와 연료분사기가 인접해 있고, 연료가 분사된 후 바로 점화가 이루어지도록 하는 분무유도방식의 LPG 직접분사엔진을 개발의 일환으로 연소제어인자의 변화에 따른 연소 특성을 분석하였다. 안정적인 연소를 위해 국부적으로 농후한 혼합기를 형성하는 성층희박연소의 특성상 일정 수준이상의 질소산화물이 배출되는 문제점을 갖고 있다. 질소산화물 저감을 위해 EGR을 적용한 결과 연료소비율과 THC의 배출은 약간 증가하지만 NOx배출은 약 15% 저감되었다. EGR 적용에 의한 연소속도의 감소는 초기 화염발달 시기에 집중되어 나타났으며 흡입공기의 희석효과에 의해 EGR율이 증가할수록 최대 열방출율 및 열방출율 증가 기울기가 감소하였다. In order to keep the competitiveness of LPG fuel for transportation fuel, the difference in fuel consumption with gasoline and cost for an aftertreatment system should be reduced with continuous development of technology for LPG engine. In the present study, spray-guided type direct injection combustion system, whose configuration is composed of direct injector in the vicinity of spark plug, was employed to realize stable lean combustion. A certain level of nitrogen oxides(NOx) emits due to a locally rich mixture regions in the stratified mixture. With the application of EGR system for the reduction of NOx, 15% of NOx reduction was achieved whereas fuel consumption and hydrocarbon emission increased. By the application of EGR, the combustion speed reduced especially appeared at initial flame development period and peak heat release rates and increasing rates for heat release rate decreased as EGR rate increased due to the dilution effect of intake air.