SHADOW GRAPHIC법을 이용한 동물 유지의 바이오 디젤 분무 형상에 관한 연구

박현창(Hyun Chang Park),윤석주(Suck Ju Yoon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

Bio-diesel(BD) has similar properties with diesel as the fuel for automotive engines. Therefor BD can be used as the alternative fuel for diesel engine without any modification and be more favorable in terms of environmental issues than diesel. In this paper, we were performed a study on the spray formation of the animal fat bio-diesel using shadow graphic technique. Animal fat bio-diesel were made from Palm,Lard and Beef-tallow. The experiments were conducted for different injection pressure varied from 25MPa to 160MPa by setting the injection duration at 1.5ms and the images of the spray formation developed from the diesel fuel injector captured by high speed digital camera were analysed. As the experimental results, BDs are longer spray penetration than diesel and similar spray cone angle with at the same injection pressure. The spray penetration increased and the spray cone angle decreased with increasing injection pressure.

공동체 사목의 단초를 위한 ‘덴칭거’의 유의미한 비전 탐색

박현창(Hyun-Chang Park) 한국가톨릭신학학회 2017 가톨릭신학 Vol.0 No.30

이 논문은 우리 시대에 더는 유보할 수 없는 신앙 공동체의 쇄신을 이유로 이에 상응할 만한 ‘덴칭거’의 유의미한 비전을 탐색하고자 하였다. 그관건은 교회의 본질을 바라보는 시대징표의 입장에 달려 있다. 19세기 신학이 계몽주의의 유산과 첨예한 논쟁을 벌이며 몰두한 두 가지 주제는 종교적 인식의 물음, 곧 ‘신앙과 이성의 관계’이고 다른 하나가 ‘교회의 본질’ 에 관한 물음이다. 20세기 초까지도 세상과 소통이 더뎠던 교회가 호교론의 입장에서 교회의 본질에 관한 이해를 ‘그리스도의 몸’ 또는 ‘그리스도의 신비체’ 개념에 의지해왔다. 그러나 20세기 중반에 이르러 ‘하느님의 백성’ 개념이 신학적 논쟁을 거쳐 제2차 바티칸 공의회의 신학사상 정립에 기여 하였다. 이는 공동체 사상과 사목을 위해서도 유의미한 발전이 아닐 수 없다. 덴칭거의 ‘신경 편람’도 교회가 각 시대마다 전통과 쇄신 사이에서 ‘자 기정체성’을 발견하려는 고민의 흔적들을 역력히 반영하고 있다. 그러나 지금까지 ‘덴칭거’에 수록된 본문들의 선택이 보여 주듯, 교황의 교도권 문헌들을 강조하느라 상대적으로 개별 공의회와 지역 공의회의 가르침, 개별 주교들의 가르침 또는 교부들과 평신도에 관한 증언들이 상당히 가려져 있다. 따라서 교도권 형식의 모든 결정과 선언이 자리하고 있는 전체 맥락을 살펴야 한다. 또한 그 속에서 ‘시대의 징표’를 지속적으로 탐색하는 일이야 말로 신학도의 중요한 과제가 아닐 수 없다. This article deals with the meaningful vision of ‘Denzinger’ for correspond to the reason of renewal of the faith community, which can not be moved in our time. The key is based on the point of signs of the times related to the essence of the church. The two themes of the 19th-century theology controversy with the Enlightenment are the question of religious perception, ‘the relationship between faith and reason’, and the question about ‘the essence of the church.’ The church, which had been slow to communicate with the world until the beginning of the 20th century, has relied on the concept of ‘the Body of Christ’ or ‘mystical of Christ’ to understand the essence of the church from the standpoint of paganism. However, by the middle of the 20th century, the concept of ‘the People of God’ had undergone a theological debate and contributed to the establishment of the theological thought II. Vatican Council’s. This is also a significant development for community thought and pastoral theology. ‘Enchiridion’ of H. Denzinger is also reflects the traces of finding the ‘self-identity’ of church between tradition and renewal in the process of the facing each age. The selection of texts in previous editions of ‘Denzinger’ severely relegated to the background the magisterial witnesses of particular and provincial synods and of individual bishops and Testimonies of the Fathers and laymen in favor of papal doctrinal documents. It is necessary to consider the overall context in which all definitions and declaration of a magisterial sort appear. From there, search continuously ‘the signs of the times’ will be one of the important tasks of theologian.

바이오 디젤의 무화 특성 비교 연구

박현창(Hyun Chang Park),윤석주(Suck Ju Yoon) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

Bio-diesel has similar properties with diesel as the alternative fuel and is more favorable form environmental issues. In this pater, we were performed a study on the atomization characteristics of bio-diesel. we used the beef-tallow and lard of animal fats BD and palm of vegetable BD As experimental fuels and performed different injection pressure varied form 25MPa to 160MPa by experiments conditions. by using high speed digital camera, we were analysed for macroscopic characteristics of spray, such as spray angle , spray penetration and spray velocity, on injection duration at 1.5ms. Also, When using LDPA device, we were known about the microscopic characteristics of spray, such as SMD and Dmax, on injection duration 4ms. As the experimental results, The spray penetration increased with increasing injection pressure. Beef-tallow BD was shown adjacent to diesel. The spray angle showed almost similar distributions regardless of BDs and injection pressure. also, The mean droplet size such as SMD and Dmax of BDs decreased with increasing injection pressure. In the case of injection pressure of 25MPa, Dmax showed that about BDs in the size fo the difference was caused significantly.

바이오 디젤 혼합율이 미립화 특성에 미치는 영향

박현창(Hyun-Chang Park),윤석주(Suck-Ju Yoon) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

The bio diesel became one of the environmentally friendly alternative fuel when applied to the combustor. In this paper, we were performed atomization characteristics by bio diesel blended rate for injection pressure varied form 0.8MPa to 1.8MPa. the LDPA(Laser Diffraction Particle size Analyzer) was measured atomization characteristics such as SMD, Dmax and Span-factor. To the experimental result, Particle size showed the tendency to be increase according to the blending rate of the bio diesel, and Variation of particle size was less when compared kerosene within blending rate of 30%.

축류펌프 안내깃 설계변수가 성능에 미치는 영향

박현창(Hyun-Chang Park),김성(Sung Kim),이경용(Kyoung-Yong Lee),김준호(Jun-Ho Kim),윤준용(Joon-Yong Yoon),최영석(Young-Seok Choi) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11

축류펌프 안내깃의 성능 향상을 위한 수치해석적 연구

박현창(Hyun-Chang Park),김성(Sung Kim),윤준용(Joon-Yong Yoon),최영석(Young-Seok Choi) 한국유체기계학회 2012 한국유체기계학회 논문집 Vol.15 No.6

미립화 및 분무장치 : 동물성 바이오 디젤의 미립화 특성연구

박현창 ( Hyun Chang Park ),윤석주 ( Suck Ju Yoon ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-

Rapid depletion of Fossil fuel resources and increased environmental pollution are requiring development of alternative fuels form renewable resources. Bio-diesel(BD) can be alternative for existing fuels and solve environmental problems. BD produced form vegetable oils have been done many studies. But, vegetable oil BD is the expansive production expense because of the rise in crop price. Thus, Researches of cheap BDs are needed expect vegetable oils. Animal fat is one of them. Animal fat BD is similar properties as commercial diesel and lower cost of production than vegetable BD. In this pare, we were performed atomization characteristics of animal fat BD, for Lard and Beef-tallow, according to increasing injection pressure and analyzed by using LDPA. Also, it was compared with Palm oil. The experimental results indicate the mean droplet size of animal fat BDs that is smaller than the mean droplet size of Palm oil BD.

광회절법 입경측정기에서 수광렌즈의 영향

박창운 ( Chang Un Park ),정성욱 ( Seong Uk Jeong ),박현창 ( Hyun Chang Park ),윤석주 ( Suck Ju Yoon ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-

LDPA(Laser diffraction Particle size Analyzer),that is measuring the size of the particle according to the degree of diffraction of the laser by light scattering, was selected the light-receiving lens in accordance with the working distance and measuring range. In this paper, we were performed about the effect of the light-receiving lens form R3 to R6 and used the five sprayers such as Diesel injector, Humidifier, Syringe, Burner nozzle, Paint sprayer. We were analysed the association of the both liht-receiving lens and sprayers though SMD, Dmax, Distribution. As the experimental results, The light-receiving lens form R3 to R4 were showed more accurate results for small particles than this of R5 and R6 because R3 and R4 were able to collected more of the relativelt small praticles by small measuring ranges. So, LDPA was used to measure large particles in the case of the R5 and R6. Thus, the sprayers should be a reasonable choice of the light-receiving lens.

분사압력 변화에 따른 바이오 디젤 무화 특성 연구

박창운 ( Chang Un Park ),박현창 ( Hyun Chang Park ),윤석주 ( Suck Ju Yoon ),( Seong-uk Jeong ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-

The bio diesel had similar properties with diesel, and was well-known as the powerful alternative of the diesel and kerosene. It was available to the trafficking source for energy as well as operation fuel of the home combustor. In this paper, we were studied the atomization performance of the bio diesel in which it controls the boiler performance, and analyzed the effect of the injection pressure varied form 0.4MPa to 2MPa by experiments conditions. As the results, the flow-rate of bio diesel was increased according to increase the injection pressure, and Injection pressure of 1.5MPa was showed Fully developed bio diesel spray. Dmax, MMD and SMD were decreased with increasing injection pressure.

다수 쌍의 L-Slot을 이용하여 무선 휴대 단말기용 MIMO 안테나 시스템의 격리도를 향상시키는 방법

이현석(Hyun-Seok Lee),윤상원(Sang-Won Yoon),박현창(Hyun-Chang Park),박형무(Hyung-Moo Park) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.8

본 논문에서는 2.3~2.4 ㎓ 대역 무선 휴대 단말기용 내장형 MIMO 안테나 시스템의 격리도를 향상시키는 방법을 제시하였다. 제안된 MIMO 안테나 시스템은 2개의 안테나 사이의 그라운드 기판에 다수 개의 L-slot으로 구성된 multi-slots를 위치시키며, multi-slots가 대역 차단 필터처럼 작용하여 안테나 간의 상호 결합을 억제시켜 격리도를 향상시킨다. 6쌍의 L-slots를 채택한 MIMO 안테나 시스템은 -26.4 ㏈의 반사 손실과 -37.5 ㏈의 격리도를 나타내었다. A method to improve isolation characteristics of internal MIMO antenna systems for wireless portable devices operating in the 2.3~2.4 ㎓ band is presented. The proposed system incorporates multiple pairs of L-slots between the two antennas in the ground plane, which operate like a band-stop filter, suppressing mutual coupling between the antennas and resulting in improved isolation. A MIMO antenna system with 6 pairs of L-slots shows reflection loss of -26.4 ㏈ and isolation of -37.5 ㏈.