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이상곤,김동성,황철승,조원철,이태식,Lee. Sang-Gon,Kim. Dong-Sung,Hwang. Cheol-Seung,Cho. Won-Cheol,Lee. Tae-Shik 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Due to the benefit of QRA(Quantitative Risk Analysis) method, we can evaluate the risk, and it helps us to make our safe. We also depend to some of correlation equations to assess the jet fire at high pressurized transmission line. However, we can evaluate the risk within limitations. After comparing the current model to investigation report of natural gas transmission line accident at EL-Paso in U.S., this study concludes that more research and study are required because currently developed model cannot expect factors of the fire risk such as flame configuration.
Die design in the complex shape drawing of cross roller guide to improve the dimensional accuracy
이상곤,J. E. Lee,B. M. Kim,S. M. Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.10
A drawing process allows for a smooth and clean surface, metal savings, low cost tooling, and closely controlled dimensions to be obtained in long products that have constant cross-sections. Recently, rods having irregular sections more complex than a rectangle or ellipse are necessary to produce mechanical parts. A cross roller guide is one of the parts produced by complex cold-shaped drawing. A cross roller guide has a linear bearing system that rolls along a guide way. A cross roller guide is one of the most important components in terms of equipment because the quality of the linear rail influences the precision linear motion. Therefore, the final dimensional accuracy of the linear rail in cold-shaped drawing is very important. The aim of this study is the optimization of the optimal die angles to improve the dimensional accuracy and straightness of the final product using design of experiment, FE-simulation, and the Taguchi method. Based on the analytical results, experiments for real industrial products have also been implemented to verify the results. From the experimental results, it was possible to improve the dimensional accuracy and straightness of final product.
도심항공 모빌리티(UAM)를 위한 틸트 덕티드 팬 형 eVTOL의 초기 사이징
이상곤,고보성,안성호,황호연,Lee, Sang Gon,Ko, Bo Sung,Ahn, Seong Ho,Hwang, Ho Yon 한국항공운항학회 2021 한국항공운항학회지 Vol.29 No.3
A large amount of time and cost is consumed due to congestions caused by an increasing number of cars which results in a lot of emissions. To overcome these problems, a new electric vertical takeoff and landing (eVTOL) aircraft is being considered. Since vertical take off and landing without a separate runway is realized and electricity is used as a power source, it could solve the saturated ground traffic congestions without emissions. In this paper, the initial sizing was performed based on the Nexus 6HX of Belltextron which is a tilt-ducted fan type. In this study, the electric propulsion system that only uses battery was implemented instead of current Nexus 6HX hybrid electric propulsion. Aerodynamic analyses were performed using OpenVSP and XFLR5. Power-to-weight ratio, wing loading, estimated weight were calculated with these analyses.
직접형 디지탈 주파수 합성기 동작 속도 향상을 위한 파이프라인형 위상누산기의 설계
이상곤,유흥균 ( Sang Gon Lee,Heung Gyoon Ryu ) 충북대학교 산업과학기술연구소 1994 산업과학기술연구 논문집 Vol.8 No.2
Abstract_Roman In this paper, we design the logic circuit of pipelined phase accumulator in DDFS(direct digital frequency synthesizer) with dynamic D F/F, and simulate it. The design methods of the adder and D F/F are described. To design and verify th