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김귀남(Gwi-Nam Kim),김지혜(Ji-Hey Kim),성헌진(Heon-Jin Seong),전종훈(Jong-Hoon Jeon),허선철(Sun-Chul Huh) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This study was designed to examine the physical disintegration of graphene(GN), the excellent heat conductor, by using the planetary ball mill, the simple and convenient means to produce particles arbitrarily. The conditions for the disintegration of grapheneGN were distinguished by the rotation of planetary ball mill (200 rpm, 400 rpm, and 600 rpm) and by the duration of its operation (30 min., 60 min., and 90 min.), respectively. At this result, when experimental condition is 200rpm with 60min, particle size was the smallest to 328nm and results of thermal conductivity was the highest. In results of absorbance, grapheneGN was well dispersed because value of absorbance is high.
In-line형 심해 유수분리기의 분리 효율에 관한 연구
김현지 ( Hyun-ji Kim ),김귀남 ( Gwi-nam Kim ),김영주 ( Young-ju Kim ),우남섭 ( Nam-sub Woo ),허선철 ( Sun-chul Huh ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.3
The implementation of subsea separation and liquid boosting is becoming a common development scheme for the exploration of deep water fields. Subsea separation is an attractive and economic solution to develop deep offshore fields producing fluid without hydrate or wax. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. Subsea separation system should be reliable to ensure successful operation in a wide range of 3-phase flow regime. In this study, multiphase flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system.
배경태(Gyeong-Tae Bae),김귀남(Gwi-Nam Kim),최부영(Boo-Young Choi),문홍만(Hong-Man Moon),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.1
To improve the accuracy of a machine, research needs to be conducted on the relationship between the output variables and design variables of a spindle-shaped part from the thermal and static viewpoints. Therefore, research was carried out by examining the correlation of each variable to find the optimum conditions. Moreover, DOE (design of experiments) was extensively used. The model used in this study was a grinding spindle to which a hydrostatic bearing was applied. This model was used in a preliminary analysis based on the experimental results of the previous studies. The influences of the output variables and design variables were compared through a main effect analysis. Generated response surfaces were applied to the Kriging model. To optimize the model, a screening method was selected. In comparison with the initial model, the deformation of the optimized model designed by DOE decreased by 4.1 ㎛, while the thermal deformation decreased by 1.2 ㎛. Therefore, it was efficient to design a spindle-shaped part through DOE to improve the accuracy of the machine.