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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.
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박철웅 ( Cheol Woong Park ) 한국지형학회 2014 한국지형학회지 Vol.21 No.1
This paper reports, based on field survey and literatures, The so-called Hoodoo rock landscape features on Yehliu promontory, Yehliu Geopark, in northeast Taiwan. In this area, the most abundant hoodoos are pedestals, which are locally called mushroom rocks, and Ginger rocks, which are stand up calcareous concretions occurring in a thin bed tone, also micro honeycomb weathering rocks, different colors of oxidation in rocks, Joint patterns of sandstone beds like a ‘Bean Curd Rock’, sea caves in company with macro Cuesta. Research revealed that these rock landscape is as a result of the interactions of internal and external agency, what we call polygenesis. According to works, Hoodoo rocks exposed not only arid region but also various climatic environments, and have identified various weathering and erosion agents. It is also a significant classroom of fieldwork that understands rock coastal la ndscape and micro tafoni as gotbawi, Bange-sum, Sodle and so on in korean coast.
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지석묘의 입지특성과 축조방식에 대한 지형학적 고찰 -효산리,대신리를 중심으로-
박철웅 ( Cheol Woong Park ),김인철 ( In Cheol Kim ) 한국지형학회 2012 한국지형학회지 Vol.19 No.3
This study aims to think about the problem of dolmens: the reasons for the presence of dolmens and how to construct it, at the point of view of geographical and geomorphological. The subjects of this study is the dolmens which locate between at Dogok Hyosanri and Chunyang Daesinri Hwasoon-gun, Jeonlanamdo. The study areas in Hyosanri, Daesinri has been observed as follows. First, the long axis direction of Dolmen upper stone and the slope one are the same. Second, tor, block stream, hockey stick, etc. Third, Composition of the soil silt> sand> clay is distributed in the order. Forth, The soil of high quality silt and the roundness of angular, sub-angular-level and the high frequency, peaks of quarts and illite clay minerals show. Fifth, in the result of SiO2/Al2O3, SiO2/R2O3, and CIA(Chemical Index of Alteration), Hyosanri, Daesinri areas show mechanical weathering was dominant and chemical weathering environment was not being progressed. The blocks used in construction of dolmens had moved to the bottom of slopes by mass movement such as solifluction then them which had been placed in the position seem to be used by people of Bronze. Based on the above results, the process of construction of dolmens can be estimated as follows. They would dig up the ground under the upper stone of dolmens, put the supporting stone in the place, then dig up earth, place into remains, close the obturating stones, then heal up earth.
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박철웅(Cheol Woong Park) 한국지역지리학회 2001 한국지역지리학회지 Vol.7 No.2
본 연구는 지리 교육에서 급변하는 지식·정보화 사회의 변화에 적응하고 앞으로 적용될 제7차 교육과정 특히 수준별 수업의 원활한 실현을 위한 방안을 모색한 것이다. 이를 위해 우선 지리 영역의 지형단원을 중심으로 지리과 심화·보충형 수준별 수업을 위한 교과서의 재구성하여 홈페이지를 구축하였다. 과제해결학습을 통한 수준별 교수·학습과정의 모형을 통해 수업설계를 탐색하였다. 이 모형을 구성주의 학습 원리에 적합한 웹 기반 수업(WBI)에 접목하여 웹활용 수준별 수업을 설계 제시하였다. 이를 통해 지리교과의 현장 적용과 교수·학습 방법을 개선하고자 하며 동시에 이를 통한 지리교육의 활성화 방안을 모색하고자 한다. The present education situations are rapidly changing to adapt to `the Knowledge & Information-based Society`. Especially, the implementation of `the 7th National Curriculum` put strong emphasis on the learner-centered education that refers to the ability grouping. Therefore, it is necessary that the change from a traditional teaching method to a learner-centered one in geography education will take place. This study will present a design of geography ability grouping through the Task-Solving Learning. This ability grouping method is suitable for the large class. And this study also presents a strategy by applying WBI, which make use of the advantage of computer and constructivism. This WBI model can be applied properly to many teaching-learning methods that includes Self-Directed Learning, Collaborate Learning, Ability Grouping, and Applying ICT Instruction. Actually they are demanded in the current education. A geography-classroom will have an accessible internet program as a precondition for this instruction.
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박철웅 ( Cheol Woong Park ) 한국지형학회 2011 한국지형학회지 Vol.18 No.4
This paper describes a dune field on shoreline of Young Gwang. To clarify geomorphic characteristics, made an analysis of grain size of the sand sediments samples and surface texture of quartz grains, and field survey. The following results were obtained : 1) Young Gwang sand dune is taking to pieces by human impact, and dose not move ahead the process of sand dune. 2) there was a turbulence of sand sediments outcrops saying to the cryoturbation that represents cold climatic environments, 3) Constituents of sand dune are mainly fine and very fine sand(2.5~4.5f) consisted by quartz and feldspar. Young Gwang sand grians have some analogy with different sites in west coast 4) In surface texture, roundness is thought to have been formed sub-angular, and some V cracks represented mechanical weathering environments. Especially, the dune environment has significant cultural and archaeological values arising from the occupation of human in the past. Those areas where occupation is known provide a valuable source of past records relating to human settlement.
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