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레이저산란패턴 기반 나노 래핑 표면 거칠기의 실험적 모델링 및 추정에 관한 연구
홍연기(Yeon Ki Hong),김경범(Gyung Bum Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6
본 논문에서는 나노 래핑 표면의 형상과 레이저산란 패턴 사이의 실험적 모델링에 관한 연구를 하였다. 우선, 반사표면에서 나타나는 산란광 속성들을 고찰하여 암시야 기반의 레이저산란 검사 메커니즘을 구성하였다. 이 메커니즘을 이용한 레이저산란 패턴 분석의 경우, 나노 래핑 표면 형상으로부터 산란된 레이저산란 성분은 불규칙하게 사선형태로 교차됨을 알 수 있다. 또한, 실험 계획법을 기반으로 도출된 매개변수로 적용된 최적의 레이저산란 영상에서 나노 래핑 표면 거칠기와 레이저산란 성분 사이의 상관관계를 회귀분석법을 이용하여 수학적 모델링을 시도 하였다. 이 모델의 검증을 위해 나노 래핑 표면 3 종류의 거칠기에 대해 50 번의 반복실험을 수행한 결과, 제시된 수학적 모델은 실제 거칠기 값에 근접하게 추정할 수 있음을 보였다. In this paper, an experimental modelling between nano-lapping shape and its laser scattering pattern has been studied. Laser scattering attributes on reflected surface are investigated and then laser scattering mechanism is implemented based on dark-field method. When it comes to the investigation of laser scattering patterns, scattering components resulting from nano-lapping shape are appeared in the shape of crossed irregular lattice. In addition, the correlation between nano-lapping surface roughness and its laser scattering features is identified using regression analysis, in optimum laser scattering images from the design of experiment. As a result of fifty times experiments against three kinds of nano-lapping surface roughness, it is shown that the presented mathematical modelling can be estimated up to real roughness values.
분리기술 열역학 : 관형 PDMS / 세라믹 복합막을 이용한 수용액상에서의 잔류페놀에 대한 투과증발 특성
홍연기(Yeon Ki Hong),김용운(Yong Woon Kim),홍원희(Won Hi Hong) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
PDMS(Polydimethylsiloxane)/ceramic composite membrane was used in pervaporation process in order to enhance the flux with maintaining proper selectivity. In pervaporation of trace phenol from aqueous phenol solution, selectivities of phenol decreased and fluxes increased with concentration of phenol in feed mixtures. And selectivities of phenol increased with operating temperature. This phenomenon could be explained by coupling of each components, plasicization of PDMS membrane, and capillary condensation of water in ceramic pores.
레이저 산란 영상을 이용한 표면거칠기의 실험적 규명에 관한 연구
홍연기(Yeon Ki Hong),김경범(Gyung Bum Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.1
본 논문에서는 레이저 산란 영상을 이용하여 표면거칠기를 실험적으로 규명하였다. 우선, 레이저 산란 매개변수들과 표면형상에 따라 나타나는 광로의 편향성에 대해 고찰하였고, 이를 이용하여 레이저 산란 검사시스템을 구성하였다. 연삭표면에서 획득한 레이저 산란 영상을 분석한 결과 영상에서 수직방향으로 나타나는 산란광 분포영역이 증가와 감소를 반복하는 특징이 나타났다. 이러한 차별적 특징을 표현하는 레이저 산란 영상을 획득하기 위해 실험계획법을 이용하여 레이저 산란변수들의 최적조건을 선정하였고, 연삭표면에서 표면거칠기가 증가함에 따라 레이저 산란 영상 내에서 수직방향으로 나타나는 산란광 분포 영역이 선형적으로 증가함을 알 수 있었다. 이러한 정보는 마이크로 표면의 평가 및 거칠기 측정 시 주요한 인자로 사용될 수 있을 것이다. In this paper, surface roughness has been experimentally identified using laser scattering images. The parameters and optical deflected rays of laser scattering are investigated on laser scattering system, and then their optimum parameters on grinding surfaces are selected using design of experiment. The application of the optimum parameters results in featured laser scattering images, in which the mean of vertical scattering distributions is regarded as a feature. It is shown that the feature of laser scattering distributions is linearly increased according to grinding surface roughness and so the information can be used as important factor for the measurement and evaluation of various surface roughness. In the future, the performance of the proposed laser scattering method will be evaluated using AFM.
레이저산란패턴 기반 나노 래핑 표면 거칠기의 실험적 모델링 및 추정에 관한 연구
홍연기(Yeon Ki Hong),김경범(Gyung Bum Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1
본 논문에서는 나노 래핑 표면의 형상과 레이저산란 패턴 사이의 실험적 모델링에 관한 연구를 하였다. 우선, 반사표면에서 나타나는 산란광 속성들을 고찰하여 암시야 기반의 레이저산란 검사 메커니즘을 구성하였다. 이 메커니즘을 이용한 레이저산란 패턴 분석의 경우, 나노 래핑 표면 형상으로부터 산란된 레이저산란 성분은 불규칙하게 사선형태로 교차됨을 알 수 있다. 또한, 실험 계획법을 기반으로 도출된 매개변수로 적용된 최적의 레이저산란 영상에서 나노 래핑 표면 거칠기와 레이저산란 성분 사이의 상관관계를 회귀분석법을 이용하여 수학적 모델링을 시도 하였다. 이 모델의 검증을 위해 나노 래핑 표면 3 종류의 거칠기에 대해 50 번의 반복실험을 수행한 결과, 제시된 수학적 모델은 실제 거칠기 값에 근접하게 추정할 수 있음을 보였다. In this study, a correlation between the roughness of nanoscale lapping surface and its laser scattering pattern has been identified experimentally. The characteristics of laser scattering on a reflected surface are investigated, and a laser scattering mechanism is newly designed by adopting the dark-field method. Laser scattering patterns resulting from nanoscale lapping shape are in the shape of crossed irregular lattice. In addition, optimum laser scattering images are obtained by the design of experiment, and the roughness of nanoscale lapping surface is estimated using regression analysis certain useful features of the laser scattering patterns. The results of fifty experiments on three types of nanoscale lapping surfaces show that the roughness of nanoscale lapping surfaces can be accurately estimated by the proposed mathematical modeling method.
총설 : 1,3-프로판디올의 생물학적 생산을 위한 분리공정
홍연기 ( Yeon Ki Hong ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
As the biodiesel production is increasing rapidly, the crude glycerol, which is principal by-product of biodiesel production, has also been generated in a large amount. Many research studies on value-added utilization of glycerol are under investigation. 1,3-Propandiol is a promising chemical which can be produced from fermentation of glycerol because the application of 1,3-propanediol is mainly in the production of bio-PTT (Poly(trimethylene terephthalate). However, the cost of downstream processes in the biological production of 1, 3-propanediol can make a high portion in the total production cost. This review summarizes the present state of separation processes in each step studied for the removal of impurities and the recovery of 1, 3-propanediol from its fermentation broth. Furthermore, ATPE (Aqueous Two Phases Extraction) process is suggested as an attractive alternative for the primary separation process of 1,3-propanediol because ATPE is convenient for the simultaneous removal of microbial cells and impurities such as salts of organic acids and the separation of 1,3-propanediol from fermentation broth.
수상이성분계에 의한 1,3-프로판디올 추출특성에 대한 알콜과 카르복실산의 영향
홍연기 ( Yeon Ki Hong ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.5
1,3-Propandiol is a promising chemical which can be produced from fermentation of glycerol because the application of 1,3-propanediol is mainly in the production of bio-polytrimethylene terephthalate (bio-PTT). However, the cost of downstream processes in the biological production of 1,3-propanediol can make a high portion in the total production cost due to the large amount of water and the by-produced carboxylic acids such as succinic, lactic and acetic acids in 1,3-propanediol fermentation broth. In this study, aqueous two-phases systems composed of hydrophilic alcohols and phosphate salts were applied to the recovery of 1,3-propanediol from its artificial aqueous solution. Formation of aqueous biphases in hydrophilic alcohols and phosphate salts was due to the salting-out effect of salts in bottom phase, thereby 1,3-propanediol in bottom phase was moved into top phase. Extraction efficiency for 1,3-propanediol was proportional to the polarity of hydrophilic alcohols and the basicity of salts and the maximum value of extraction efficiency was more than 98%. In the aqueous two-phases systems after extraction, there was no carboxylic acid in top phase. Therefore, it was concluded that the aqueous two-phases systems composed of hydrophilic alcohols and phosphate salts were effective for the selective recovery of 1,3-propanediol without any coextraction of carboxylic acids.
분리기술 열역학 : 아민추출제를 이용한 반응추출에서 숙신산의 분리특성
홍연기(Yeon Ki Hong),홍원희(Won Hi Hong) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.2
Succinic acid has recently been drawing much interest as a raw material for biodegradable polymer. In this study succinic acid was separated by reactive extraction with tertiary amines dissolved in various diluents. Distribution coefficients were determined as the function of TPA(tripropylamine) concentrations, diluents, and chain length of tertiary amines. The extraction capacity increased with the polarity of diluents, the concentration of TPA in organic phase and the chain length of amines. Furthermore, the coextracted water into the organic phase enhanced the solubility of succinic acid into organic phase.