• 한국응용과학기술학회지
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• 제14권2호
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• pp.41-48
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• 1997

Separation of EPA and DHA from fish oil fatty acid ethyl ester (FAFE) by urea adductive crystallization method was carried out in the supercritical carbon dioxide (SC $CO_2$) as a solvent. Our results showed that SC $CO_2$ is a good candidate as a solvent in the urea adductive crystallization to separate FAFE by the number of unsaturated bonds. Compared to the separation process using methanol. SC $CO_2$ yielded better performance in the overall selectivity of EPA and DHA. The effect of process variables on separation of EPA and DHA was discussed in detailed. A hybrid technology of SC $CO_2$ fractionation and urea adductive crystallization with SC $CO_2$ was conformed as a viable process to separate and concentrate EPA and DHA from fish oil.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2006년도 PARALLEL CFD 2006
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• pp.381-381
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• 2006

• 한국막학회:학술대회논문집
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• 한국막학회 2001년도 제13회 심포지엄 : 분리막 청정기술과 전기투석
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• pp.33-37
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• 2001

• 한국막학회:학술대회논문집
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• 한국막학회 2003년도 The 4th Korea-Italy Workshop
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• pp.61-64
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• 2003

Optical resolution of a-amino acid (tryptophan and tyrosine) optical isomers was achieved by a pressure driven membrane separation process, using self-supporting crosslinked membranes base on polysaccharide with different swelling indices that ranged from 100 to 70%. The membranes prepared by casting and drying the polymer solution containing 5wt% acetic acid on an acryl plate followed by crosslinking with glutaraldehyde were characterized using such analytical methods as FTIR and swelling index measurements. On the way of separating the optical isomers, several experimental factors such as the concentration of the feed solutions, operating pressure and temperature, and degree of crosslinking of the membranes have been studied. When the chitosan membranes with 70% of swelling index were used , almost complete optical resolution was obtained; 97.92% of enantiomeric excess (ee %) and 2.26 g/$m^2$ㆍh of flux. The operating pressure and the concentration of feed solutions were respectively 1.0 kgf/$\textrm{cm}^2$ and 0.49 mmol/L.

• 한국식품과학회지
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• 제9권1호
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• pp.68-72
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• 1977

충격방법(衝擊方法)에 의(依)하여 고추씨를 분리(分離)할 수 있으나 그 수율(收率)을 45%이상(以上) 올릴 수는 없었다. 따라서 보다 높은 씨분리수율(分離收率)을 이룩하기 위하여 고추 조직(組織)에 대(對)한 가열효과(加熱效果)를 시도(試圖)한 결과(結果) 씨의 분리(分離)가 용이(容易)하게 이룩될 수 있는 고추 내(內)의 공격(空隔)이 증가(增加)되었다. 이와같은 가열효과(加熱效果)를 씨의 분리(分離)에 이용(利用)키 위하여 회전사식원통형(回轉篩式圓筒型) 씨분리기(機)에 $65^{\circ}C$, 0.61m/sec의 열풍(熱風)을 송입(送入)하면서 씨를 분리(分離)할 경우 93%까지 분리수율(分離收率)을 높일수 있었다. 열풍하(熱風下)에서의 씨의 분리(分離)는 고추의 절단부위(切斷部位)에 따라 차이(差異)는 있었으나 고추 건조(乾燥)가 완료(完了)되기 이전(以前)에 씨의 분리(分離)를 완료(完了)할 수 있었으므로, 동시탈종(同時脫種) 건조방법(乾燥方法)이라는 새로운 고추의 가공방법(加功方法)을 개발(開發)하게 되었다.

• 멤브레인
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• 제23권6호
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• pp.393-408
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• 2013

고분자 분리막을 이용한 기체 분리막은 높은 에너지 효율, 경제적인 장점으로 최근 수년간 지속적으로 개발되어 왔다. 최적화된 경제적 성능을 얻기 위하여 기체 분리막은 높은 투과도와 선택도를 가져야 한다. 따라서 기체분리 분리막용으로 다양한 고분자를 시험한 연구 결과들이 보고되어 왔다. 다양한 소재 중, 폴리이미드는 다양한 기체인자에 대하여 높은 투과 선택도와 높은 화학적 열적 안정성, 그리고 물리적 안정성으로 많은 주목을 받아왔다. 따라서 본고에서는 기체분리용 폴리이미드 소재의 개발동향과 분리막의 제조방법, 기체 분리의 원리에 대하여 다루었다.

• Smart Structures and Systems
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• 제26권2호
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• pp.135-146
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• 2020

This paper deals with an application of adaptive blind source separation (BSS) method, equivariant adaptive separation via independence (EASI), and Teager Energy Operator (TEO) for online identification of structural modal parameters. The aim of adaptive BSS methods is recovering a set of independent sources from their unknown linear mixtures in each step when a new sample is received. In the proposed approach, firstly, the EASI method is used to decompose structural responses into independent sources at each instance. Secondly, the TEO based demodulation method with discrete energy separation algorithm (DESA-1) is applied to each independent source, and the instantaneous frequencies and damping ratios are extracted. The DESA-1 method can provide the fast time response and has high resolution so it is suitable for online problems. This paper also compares the performance of DESA-1 algorithm with Hilbert transform (HT) method. Compared to HT method, the DESA-1 method requires smaller amounts of samples to estimate and has a smaller computational complexity and faster adaption due to instantaneous characteristic. Furthermore, due to high resolution of the DESA-1 algorithm, it is very sensitive to noise and outliers. The effectiveness of the proposed approach has been validated using synthetic examples and a benchmark structure.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권4호
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• pp.357-363
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• 2006

Monolithic molecularly imprinted columns were designed and prepared by an in-situ thermal-initiated copolymerization technique for rapid separation of tryptophan and N- CBZ-phenylalanine enantiomers. The influence of polymerization conditions and separation conditions on the specific molecular recognition ability for enantiomers and diastereomers was investigated. The specious molecular recognition was found to be dependent on the stereo structures and the arrangement of functional groups of the imprinted molecule and the cavities in the molecularly imprinted polymer (MIP). Moreover, hydrogen bonding interactions and hydrophobic interactions played an important role in the retention and separation. Compared to conventional MIP preparation procedures, the present method is very simple, and its macroporous structure has excellent separation properties.

• 한국응용과학기술학회지
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• 제28권4호
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• pp.386-392
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• 2011

We are crystallized to the linear low density polyethylene(LLDPE) particles by a thermally induced phase separation(TIPS). TIPS process based on the phase separation mechanism was performed for the LLDPE system which undergoes liquid-solid phase separation. The linear low density polyethylene particle formation occurred by the nucleation and growth mechanism in the metastable region. Although the growth rates depended on the experimental conditions such as the polymer concentration and temperature, the particles were larger when the polymer concentration was higher or temperature was higher. The particles were observed by SEM. The LLDPE particle size distribution became broader when the polymer concentration was higher.

• 한국정보전자통신기술학회논문지
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• 제4권2호
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• pp.77-82
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• 2011

본 논문에서는 패닝 기법을 이용하여 믹싱된 스테레오 음원에서 음원을 분리하는 방법에 대하여 고찰한다. 음원 분리 알고리즘은 다채널 포맷 변환을 위한 업믹스나 음질 개선, 고품질 음원 분리 등 다양한 응용분야에 사용될 수 있다. 본 논문에서 사용하는 음원 분리 알고리즘은 믹싱된 스테레오 채널을 시간-주파수 별로 PCA(Principal Component Analysis) 분석 방법을 이용하여 각각의 음원들이 패닝된 방향을 추정하며, 추정된 방향의 성분만을 추출하는 방향 필터링 과정을 거쳐 음원들을 독립적으로 분리 해 낸다. 실험을 통해 각 음원 분리 알고리즘의 성능을 평가하였다.