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증발 액적 내부 유동의 스케일링 관계 및 액적 표면 점착 조건의 영향
이희웅(Hee Woong Lee),강관형(Kwan Hyoung Kang),이정묵(Choung Mook Lee),이상준(Sang Joon Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We analyzed the Rayleigh-type natural convection inside an axisymmetric, two-element evaporating droplet numerically, and the numerical results are verified by experimental results obtained by PIV technique. We found experimentally that the boundary condition on the droplet surface is close to the no-slip condition, which is assumed to be due to the Marangoni effect. The effect of boundary condition on the flow and concentration distribution is discussed based on the numerical results. From the numerical results verified by the experimental results, it is found that the governing scaling factor for the flow field inside a naturally evaporating droplet is the Rayleigh number. It is also shown, as predicted before, that there exists a pseudosteady condition for the velocity field.
이희웅 ( H. W. Lee ),권숙인 ( S. I. Kwun ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.2
The influence of the cooling condition after solution treatment on the high temperature fatigue resistance of 23Cr-26Ni heat resistant steel was investigated. Two different cooling conditions were applied to the steel after solution treatment at 1200℃ for 3 hours. One specimen was water quenched immediately after the solution treatment. The other one was furnace cooled at a rate of 0.5℃/min down to 750℃ after the solution treatment. Then, both specimens were aged at 750℃ for 5 hours. Under two different heat treatment conditions, the low cycle fatigue (LCF) test was performed at 600℃ and room temperature (RT). Only cyclic hardening continued from the beginning until fracture at all strain amplitudes during LCF at 600℃. This phenomenon was attributed to the increase in the dislocation density due to cyclic deformation, which resulted in the interaction between the newly created dislocations and precipitates. Cyclic hardening followed by saturation and cyclic softening was observed at RT. Cyclic softening was attributed to the dislocation annihilation rate exceeding the dislocation generation rate. Other probable factor for cyclic softening was some cavities formed around grain boundaries after 20 cycles. WQ and FC have a similar LCF behavior at RT and 600℃ as shown in the cyclic stress response curves.
종설(綜說) : 금궤요략 온톨로지 구축을 위한 구조 설계 연구
이희웅 ( Heui Woong Lee ),정태영 ( Tae Young Jung ),박종현 ( Jong Hyun Park ) 대구한의대학교 제한동의학술원 2013 東西醫學 Vol.38 No.1
Gumgueyolak(金櫃要略), written by Zhang Zhung-Jing(張仲景) in late Han(漢) Dynasty of China, is believed to be the professional book about divers disease of oriental medicine, So, this book is consideredone of the medical Bibles. This study was started to establish intelligent database to increase search and practical use of Gumgueyolak. So we decided to establish structure of Gumgueyolak ontology to set up the relationships of each list, For this, we analyzed construction of content and extracted some lists needed for ontology to establish the relationships between them.