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유병철(Byungchul Yoo),이건상(Kun Sang Lee),백지환(Jihwan Back) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
With the increase of the interest in environment and the development of technique we need the proper treatment of disused consumer goods (vehicles, white household appliances, yellow household appliances, etc.) of complicated structure. Especially we must make an effort at the development of End-of-life vehicle treatment system with good efficiency and high productivity. This paper represents a study on the method to enhance the productivity and the efficiency of End-of-life vehicle treatment system through line balancing and pitch diagram.
유병철(Byungchul Yoo),이건상(Kunsang Lee),변철웅(Cheolwoong Byun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most products arc composed of many parts in various kinds of materials. For the recycling, they should be easily disassembled and classified by material or kinds of parts after the life cycle of products. Because their shapes and material kinds are, however, specified mainly for the reduction of production cost, it increases the cost of recycling and the total cost in the point of the total product life cycle's view. Therefore the methods and procedures for disjointing the parts must be clearly defined and documented from the initial phase of engineering. In this paper, an engineering procedure for the recycling will be proposed by analyzing the assembled points and directions of the every part. By this methodology the time and cost for disassembling parts will be decreased and the ratio of reusing the parts will be increased and the amount of waste will be reduced.<br/>
유병철(Byungchul Yoo),이건상(Kunsang Lee),홍존희(Johnhee Hong),조종래(Jongrae Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Today recycling has been one of the most important issues in industry as it is required to save the limited amount of natural resources and to keep the environment green. In spite of many efforts to increase recycling rate in industry, however, the practical solutions are very limited. The difficulties are caused by the existence of many parts made of diverse materials and their inevitably complicated assembly structures to satisfy different needs. This paper represents a study on the disassembly sequence generator system for parts recycling. With disassembly costs and revenues, the optimum disassembly sequence can be found with a linear programming.
부품의 결합과 해체를 동시에 고려한 구조 생성에 대한 연구
유병철(Byungchul Yoo),이건상(Kunsang Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a simple and novel structure representation supporting the assembly and disassembly planning of automotive parts. The proposed Relationship Matrix derived from a directed graph represents both the information of the component connectivity and the layout precedence of functional elements. The feasible assembly and disassembly sequences and the minimum service steps for the malfunction component can be easily derived with the corresponding inference rules. The structure representation and the inference kernel can be readily applied to future concurrent design review for assemblabilityb and recyclability.
유병철(Byungchul Yoo),이건상(Kunsang Lee),홍존희(Johnhee Hong),조종래(Jongrae Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Recent decade, recycling has been one of the most important issues in industry as required to save the limited amount of natural resource and keep the environment green. However, in spite of many efforts to increase recycling rates in industry, the solution methods are limited in reality. The difficulties are induced from many parts made of diverse materials and their inevitably complicated assembly structures to satisfy many other needs.<br/> Consequently the research exhibit the method of analysis and framing about Function Structure, Joining Structure, Disassembly Structure by the way for improving easiness of decomposition that is the condition about a loss in quantity of treat of waste matter, reuse of used products and much more.
유병철(Byungchul Yoo),이건상(Kunsang Lee),홍존희(Johnhee Hong),조종래(Jongrae Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper represents the integrated design system for recycling. This system consists of four subsystems, that is, a data base for the already analyzed commercial products, a data base for the design knowledge and principles. a data base for the now developing product, and a subsystem for the optimum disassembly path generation and the module generation.
아초산계 방청제의 전기화학적 방식성능 평가에 관한 실험적 연구
문병철 ( Byungchul Moon ),이한승 ( Hanseoung Lee ),유조형 ( Johyeong Yoo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
It is understood that there are various methods to protect the corrosion of reinforcing steels in concrete, such as the nitrous acid lithium, the nitrous acid calcium and etc. When we use the corrosion inhibitor in large quantities there is some problem that accelerates setting time and affect to durability of concrete. The nitrous acid lithium has a good effect on delays setting time, but it is more expensive the nitrous acid calcium. So the nitrous acid calcium has used more than the nitrous acid lithium. When the nitrous acid calcium is used in large quantity, there is a problem which accelerates setting time. From the results of the experiments, it was confirmed that the calcium nitrite inhibitor over dossage 0.6 (NO<sub>2</sub><sup>-</sup>/Cl<sup>-</sup>) molar ratio is very effective in protecting reinforcement from corrosion in mortar in which chloride ions have contained.
일체형 및 분절형 스틸 단조 피스톤을 장착한 디젤엔진의 연소 특성
김현철(Hyunchul Kim),나병철(Byungchul Na),이봉현(Bonghyun Lee),강정호(Jeongho Kang),김덕중(Duckjung Kim),유연설(Younsul Yoo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To meet the world's ever stringent environment regulation, the focus of current research on diesel engines are to reduce the size and to enhance the power of engine at the same time. Such requirement inherently increases the pressure of the combustion chamber. Under this high pressure, the operational pressure range of the current aluminum piston reaches to the limit requiring a piston. In this study, in order to analyze the change of power, fuel consumption and emitted gas characteristics due to weight and heat transfer characteristics difference between the aluminum piston and the steel forged piston, fuel consumption and emitted gas characteristics are analyzed using a engine dynamometer. Results indicate that the combustion characteristics of the articulated steel forged piston are similar to that the united steel forged piston.
Immediate Post-laparotomy Hypotension in Patients with Severe Traumatic Hemoperitoneum
( Gil Jae Lee ),( Min A Lee ),( Byungchul Yoo ),( Youngeun Park ),( Myung Jin Jang ),( Kang Kook Choi ) 대한외상학회 2020 大韓外傷學會誌 Vol.33 No.1
Purpose: Immediate post-laparotomy hypotension (PLH) is a precipitous drop in blood pressure caused by a sudden release of abdominal tamponade after laparotomy in cases of severe hemoperitoneum. The effect of laparotomy on blood pressure in patients with significant hemoperitoneum is unknown. Methods: In total, 163 patients underwent laparotomy for trauma from January 1, 2013 to December 31, 2015. Exclusion criteria included the following: negative laparotomy, only a hollow viscous injury, and hemoperitoneum <1,000 mL. After applying those criteria, 62 patients were enrolled in this retrospective review. PLH was defined as a decrease in the mean arterial pressure (MAP) ≥10 mmHg within 10 minutes after laparotomy. Results: The mean estimated hemoperitoneum was 3,516 mL. The incidence of PLH was 23% (14 of 62 patients). The MAP did not show significant differences before and after laparotomy (5 minutes post-laparotomy, 67.5±16.5 vs. 68.3±18.8 mmHg; p=0.7; 10 minutes post-laparotomy, 67.5±16.5 vs. 70.4±18.8 mmHg; p=0.193). The overall in-hospital mortality was 24% (15 of 62 patients). Mortality was not significantly higher in the PLH group (two of 14 [14.3%] vs. 13 of 48 [27.1%]; p=0.33). No statistically significant between-group differences were observed in the intensive care unit and hospital stay. Conclusions: PLH may be less frequent and less devastating than it is often considered. Surgical hemostasis during laparotomy is important. Laparotomy with adequate resuscitation may explain the equivalent outcomes in the two groups.