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이현성(Hyeon Sung Lee),김민재(Min Jae Kim),구할본(Hal Bon Koo),황연(Yeon Hwang),김혜정(Hye Jeong Kim),김정호(Jeong Ho Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Conventional grinding of BK7 glass will normally result in brittle fracture at the surface, generating severe sub-surface damage and poor surface finish. The precision grinding of BK7 glass in parallel grinding modes has been investigated. Grinding process, maximum chip thickness, ductile/brittle regime, surface roughness and sub-surface damage have been addressed. Special attention has been given to the condition for generating a ductile mode response on the ground surface. This study gives an indication of the strategy to follow to achieve high quality ground surfaces on brittle materials.
이현성(Hyeon sung Lee),김민재(Min Jae Kim),구할본(Hal Bon Koo),황연(Yeon Hwang),김혜정(Hye Jeong Kim),김정호(Jeong Ho Kim) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
Conventional grinding of BK7 glass will normally result in brittle fracture at the surface, generating severe sub-surface damage and poor surface finish. The precision grinding of BK7 glass in parallel grinding modes has been investigated. Grinding process, maximum chip thickness, ductile/brittle regime, surface roughness and sub-surface damage have been addressed. Special attention has been given to the condition for generating a ductile mode response on the ground surface. Experiments reveal that the level of surface roughness and depth of sub-surface damage vary differently for different condition. This study gives an indication of the strategy to follow to achieve high quality ground surfaces on brittle materials.
황연(Yeon Hwang),이현성(Hyeon-Sung Lee),김혜정(Hye-Jeong Kim),김정호(Jeong-Ho Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Glassy carbon is widely used for high temperature melting process such as quartz due to its thermal stability. For utilizing Classy Carbon to glass mold press(GMP) optical lens, brittleness of Glassy Carbon is main obstacle of ultraprecision machining. Thus authors investigated ductile machining of Glassy Carbon adopting turning and grinding process respectively. From the experiments, ultraprecision turning surfaces resulted brittle crack in all machining conditions and ultraprecision grinding surfaces showed semi-ductile mode in small undeformed chip thickness conditions.
공항건설사업 편익분석 산정모형 개발에 관한 연구 - 여객터미널을 중심으로 -
최길준(Choi, Kil-Jun),이현성(Lee, Hyeon-Sung),최하정(Choi, Ha-Jeong) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
The airport construction project judges the economic feasibility, and since the standard is not established systematically and the analysis method is unclear, the public opinion is being get losted. The economic feasibility of the airport construction project is increasing in controversy over the effect of the project because the research is not structured in providing the basis for the project Benefit cost and loss cost. If the application criteria are systematized for the estimation and benefit of the correct construction cost, it can be easily solved. In this paper, based on the analysis of existing literature and performance data, the study on the development of the benefit model for economic analysis of airport construction projects. In case of airport construction, it takes much time to analyze the benefits, but it is expected that this model can be analyzed easily and accurately.
최길준(Choi, Kil-Jun),이현성(Lee, Hyeon-Sung),최하정(Choi, Ha-Jeong) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
The airport construction project pushed ahead with the government is expected to be going forward briskly in the future. The reason is that a lot of engineers and technologies are being invested in the construction for overseas airports, as well as airports to be bulit in Korea. The resources required construction projects of airport consist of many factors, including cost, method, materials, manpower, and technical skills, but the most important one among these factors is the construction cost. However, the standard regarding airport construction costs in Korea is not established systematically. The global market is becoming global, and the criteria for the cost of airport construction projects is based on the contents of the "3rd long-term plan for airport development" presented by the Ministry of Land, Infrastructure and Transport. However, this is inconsistent with the current situation, and a huge difference is being generated. Therefore, I suggest the differences found and suggested by analyzing the costs applied to the construction of the airport used in the current feasibility analysis, And this study is to propose suggestions of the new construction costs by analyzing the cost differences between the ones in real and the standard provided by the government.
김민재(Min Jae Kim),이준기(Jun Key Lee),윤영곤(Yeong Gon Yun),이현성(Hyeon Sung Lee),김혜정(Hye Jeong Kim),김정호(Jeong Ho Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
There is an immense need to obtain nanometric surface finish on optical glass owing to the advantage of improved performance of the components. But owing to brittleness and hardness, optical glass is one of the materials that is most difficult to ultra-precision turning. According to the hypothesis of ductile mode machining, regardless of their hardness and brittleness, will undergo a transition from brittle to ductile machining region below a critical undeformed chip thickness. Below this threshold, it is believed that the energy required for plastic formation. Thus, plastic deformation is the predominant mechanism of material removal in machining these materials in this mode. An experimental study is conducted diamond cutting for machining BK7 glass. The investigation presents the feasibility of achieving nanometric surface and the understanding the mechanism of cutting glass, proving the cutting edge radius effect.
김민재(Min Jae Kim),이준기(June Key Lee),윤영곤(Yeong Gon Yun),이현성(Hyeon Sung Lee),황연(Yeon Hwang),김혜정(Hye Jeong Kim),김정호(Jeong Ho Kim) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.4
There is an immense need to obtain nanometric surface finish on optical glass owing to the advantage of improved performance of the components. But owing to brittleness and hardness, optical glass is one of the materials that is difficult to ultra-precision turning. According to the hypothesis of ductile mode machining, regardless of their hardness and brittleness, will undergo a transition from brittle to ductile machining region below a critical undeformed chip thickness. Below this threshold, it is suggested that the energy required for plastic formation. Thus, plastic deformation is the predominant mechanism of material removal in machining these materials in this mode. An experimental study is conducted diamond cutting for machining BK7 glass. The investigation presents the feasibility of achieving nanometric surface and the understanding the mechanism of cutting glass, proving the cutting edge radius effect.