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정흥철(Heung-Cheol Jeong),정지원(Ji-Won Jung),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The objective of this study is to simulate the etching characteristics under different process parameters for the optimization of etching process. The etching characteristics such as the etching factor were investigated under different operating conditions and compared with the spray characteristics. The spray characteristics were measured by using Phase Doppler Anemometer. The correlation between the etching characteristics and the spray characteristics was analyzed to simulate the etching characteristics under the actual parameters of the etching process. The parameters were distance of nozzle tip and pipe pitch. To improve the uniformity and value of etching factor in the etching process, the process parameters should be designed optimally. The distribution of spray was simulated by the Monte-Carlo Method and the process parameters were optimized by the design of experiments(DOE).
정흥철(Heung-Cheol Jeong),김영진(Young-Jin Kim),정지원(Ji-Won Jung),김덕줄(Duck-Jool Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The objective of this study is to simulate the etching characteristics with oscillation angle for the optimization of etching system. The etching characteristics were analyzed under different etching conditions. The spray characteristics were measured by Phase Doppler Anemometer (PDA). The correlation between the spray characteristics and the etching characteristics was investigated and used for fundamental data to simulate the etching characteristics with oscillation angle. The smaller coefficient of variation, the more uniform etching characteristic distribution became. It was found that numerical predictions of etching factor generally agreed well with the measured results with distance from nozzle tip. Oscillation leads to decrease of etching factor and increase of uniformity.
정흥철(Heung-Cheol Jeong),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The objective of this study is to simulate the etching characteristics for the optimization of lead frame process. And also it was carried out by application of spray technology. The correlation between the etching characteristics and the spray characteristics obtained by measurement were analyzed to simulate the etching factor under the parameters in the actual process conditions. These process parameters were spray pressure, distance from nozzle tip, pipe pitch, nozzle pitch and feed speed. To improve the etching characteristics in the etching process, the process parameters should be choosed optimally. The spray characteristics obtained by results of experiment using PDA system were simulated by the Monte-Carlo method. It was found that simulation results generally agreed well with the measured results.
산업용 에칭노즐을 이용한 Invar합금판의 식각에 분사각과 압력이 미치는 영향
정흥철(Heung-Cheol Jeong),김동욱(Dong-Wook Kim),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.8
The purpose of this study was to investigate the significant characteristics in spray of industrial etch-nozzle for the design of process. The experiment was carried out with different spray pressure and industrial nozzle in wet etch. The characteristics of liquid spray, such as axial velocity and sauter mean diameter measurements were obtained by PDA. And impact force was calculated from spray characteristics. It was found that the fluid with higher spray pressure resulted in the smaller SMD and the higher droplet velocity and impact force. The depth of etch was increased in case of high spray pressure. In the case of injection angle oscillated between 20°, the result indicated constant effect of etch. The correlation between the spray characteristics and etch ones were analyzed. The depth of etch had good positive correlation with axial velocity and impact force. The result clearly shows that the characteristics in wet etch are strongly related to the spray characteristics with process.
Lead-Frame 에칭공정에서 몬테카를로 시뮬레이션을 이용한 에칭특성 예측
정흥철(Heung-Cheol Jeong),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.1
The objective of this work is to simulate the etching characteristics for the optimization on the etching process of Lead-Frame. The etching characteristics such as etching factor, etching uniformity were investigated under different the actual operating conditions. The correlation between the etching characteristics and the spray ones were analyzed to simulate the etching characteristics in the etching process. To improve the etching characteristics in the etching process, effects of the various operating conditions such as pressure, distance from nozzle tip, pipe pitch, and feed speed should be understood in detail. The spray characteristics obtained by experiment using PDA system were simulated by the Monte-Carlo simulation. The etching process model was coded by Java language. It was found that the spray characteristics were correlated with the etching ones and simulation results generally agreed well with the measured results of etching characteristics in the etching process of Lead-Frame. The optimal operating parameters were successfully found under variable conditions.
나노구조기판의 형상 및 온도변화에 따른 액체 클러스터의 거동에 대한 분자동역학적 연구
고선미 ( Sun Mi Ko ),정흥철 ( Heung Cheol Jeong ),최경민 ( Gyung Min Choi ),김덕줄 ( Duck Jool Kim ),( Masahiko Shibahara ) 한국액체미립화학회 2008 한국액체미립화학회지 Vol.13 No.1
Molecular dynamic simulations have been carried out to study the effect of the nano-structure substrate and its temperature on cluster laminating. The interaction between substrate molecules and liquid molecules was modeled in the molecular scale and simulated by the molecular dynamics method in order to understand behaviors of the liquid cluster on nano-structure substrate. In the present model, the Lennard-Jones potential is applied to mono-atomic molecules of argon as liquid and platinum as nano-structure substrate to perform simulations of molecular dynamics. The effect of wettability on a substrate was investigated for the various beta of Lennard-Jones potential. The behavior of the liquid cluster and nano-structure substrate depends on interface wettability and function of molecules force, such as attraction and repulsion, in the collision progress. Furthermore, nano-structure substrate temperature and beta of Lennard-Jones potential have effect on the accumulation ratio. These results of simulation will be the foundation of coating application technology for micro fabrication manufacturing.