• International Journal of Contents
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• 제15권3호
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• pp.1-6
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• 2019

The purpose of this study was to identify the psychometric properties of the vocational ability scale used in the 8th Panel Survey of Employment for the Disabled in Korea by using the Rasch model. The sample data was collected from 398 individuals with intellectual disabilities. Item fitness, item difficulty, the appropriateness of the rating scale, and the separation index of the vocational ability scale were evaluated. All 15 items show an appropriate fitness level. The analysis of item difficulty indicate that modifications are required. Specifically, the need for the addition of less difficult question items is identified. The use of a 5-point rating scale is shown to decrease the test difficulty in terms of clarity and readability when appropriate and a 4-point modification is also determined as appropriate. With respect to the outcomes of the analysis, the person separation reliability value and separation index are high, and the reliability of the items is also high.

• Applied Biological Chemistry
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• 제40권1호
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• pp.48-52
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• 1997

다양한 가공 적성을 갖는 변성 전분을 토마토 케찹의 제조에 첨가하여 변성 전분의 종류 및 첨가량이 토마토 케찹의 유동 특성, 층분리 및 관능적 성질에 미치는 영향에 관하여 조사하였다. 케찹을 Herschel-Bulkley계 유체로 간주하여 분석한 결과 항복응력와 점조도지수는 ADA(acetylate distarch adipate)>SA(starch acetate)>HDP(hydroxypropyl distarch phosphate)>RCS(raw corn starch)>NS(no starch)의 순으로 크게 나타났으며 거동유동지수는 SA와 HDP의 경우 첨가량에 관계없이 거의 일정하였으나 ADA와 RCS는 첨가량이 증가할 수록 감소하는 경향을 보였다. 원심분리에 의한 층분리 검사에서는 ADA>SA>HDP>RCS>NS의 순으로 층분리가 방지되는 안정성을 나타냈다. 관능검사 결과 전반적으로 ADA(2%)>SA(2%)>RCS(2%)>NS>HDP(2%)의 순으로 기호도가 높게 나타났다.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2006년도 춘계학술대회 논문집
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• pp.477-478
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• 2006

• 멤브레인
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• 제22권2호
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• pp.77-94
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• 2012

내열성, 용매 저항성의 특징을 갖는 다공성 세라믹 소재를 이용한 무기 멤브레인이 기체분리(수소 분리, 이산화탄소 분리 등), 액체 분리(수처리, 폐수처리, 유기용매 분리 등) 등 여러 가지 분야로 그 응용이 확대되고 있다. 본 논문에서는 다공성 세라믹 멤브레인의 소재, 제조 방법에 따른 멤브레인의 구조 제어 및 성능 평가에 관한 연구를 소개하고, 멤브레인의 세공 크기에 따른 구조, 멤브레인의 특성을 이용한 여러 가지 기체 분리 및 액체 분리에 관한 연구 동향을 정리하였다.

• 펄프종이기술
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• 제32권4호
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• pp.87-94
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• 2000

The morphological properties of the traditional handmade papers made in Korea, China and Japan were identified using CLSM(Confocal Laser Scanning Microscope). It was shown that the primary and secondary wall of the Hanji fibers were separated. The lumen of the fibers was not observed. Dochim, a traditional way of Hanji calendering, was turned out to accelerate the separation of the two walls, by which the unique effects of Dochim could be obtained. There were no separation of the two walls in Chinese handmade paper and Japanese handmade paper. Lumen was not observed in Senji fibers but it was observed in Whasi fibers. It was postulated that the morphological properties of the fibers are closely related with the calligraphic writings or drawings properties of handmade papers.

• 멤브레인
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• 제24권5호
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• pp.409-415
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• 2014

본 연구에서는 석유화학공정 중에서 많은 에너지를 소비하는 NCC(Naphtha Cracking Center) $C_3$ splitter를 대신하여 에너지 소비가 적고 친환경 공정인 막분리법을 이용하여 프로필렌/프로판의 분리특성을 예측하고자 한다. 막소재로는 프로필렌/프로판 분리에 대하여 우수한 성능을 나타내는 것으로 잘 알려진 촉진수송막을 사용하였다. 실험에 사용된 촉진수송막은 한양대학교에서 제조한 은나노입자가 함유된 VP/$AgBF_4$/TCNQ 용액을 에어레인에서 다공성 폴리이서이미드 중공사에 얇게 코팅하여 소형 중공사 막모듈로 제작하였다. 제작된 촉진수송막 모듈의 투과성능을 평가하기 위하여 프로필렌과 프로판에 대한 단일기체 테스트를 진행하였다. 분리막의 투과현상을 예측하기 위하여 전산모사 프로그램을 개발하였다. 개발된 전산모사 프로그램에 단일기체 테스트를 통해 얻어진 투과도와 선택도를 이용하여 95/5 vol% $C_3H_6$ / vol% $C_3H_8$ 혼합가스를 공급하였을 경우, 공급측 및 투과측 압력 변화에 따른 투과측 프로필렌의 농도가 99.5 vol%를 유지하는 단일 분리막 공정을 설계하였다.

• 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.

• 센서학회지
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• 제25권3호
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• pp.213-217
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• 2016

The superhydrophobic and superoleophobic meshes surfaces have been used in various applications such as self-cleaning, anti-icing, gas exchange, oil-water separation, sound-wave penetrable anti-wetting structures, etc. In particular, there are many studies for oil-water separation with environmental issues. Because of high pressure and dynamic environment, oil-water separation filters must have stable surface properties as super-hydrophobicity and superoleophobicity. The oleophobicity of surface depends on the surface chemistry and roughness of the surface. The roughness of oleophobic surface enhances its static contact angle and stability. The multi-scale hierarchical structure provides a stable superhydrophobic state by maintaining a Cassie state. In this research, we fabricated a superoleophobic mesh with a multi-scale hierarchical structure to increase the pressure resistance and adjusted a size of the mesh hole.

• Korean Membrane Journal
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• 제4권1호
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• pp.12-19
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• 2002

Nanofiltration of aqueous dye solutions was carried out using polyamide (PA) nanofiltration (NF) composite membranes. The PA composite membranes were prepared by the interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC) on the surface of microporous polysulfone (PSf) ultrafi1tration (UF) membranes. After characterization in terms of their permeation performance and surface ionic property, they were used for the separation of dye solutions such as Direct Red 75, 80, 81, and Direct Yellow 8 and 27. The separation conditions were varied to study the factors affecting on the permeation performance of the membranes: different concentrations of dye solutions, operating temperature and time, and flow rate of a feed solution. The surface property of the membrane, especially its ionic property, as a function of operating time was examined with a zeta-potentiometer and the relationship between the surface chemistry of the membrane and its permeation properties was also studied.

• 한국막학회:학술대회논문집
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• 한국막학회 2003년도 The 4th Korea-Italy Workshop
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• pp.87-89
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• 2003

Thermoplastic polyurethane(PU)-based blend membranes were prepared by the solvent evaporation process. The gas sorption, diffusion, and permeation properties of PU-based blend membranes have been studied. The morphology of PU-based blend membranes was investigated by SEM. The result showed that phase separation occurred with increasing blend ratio. $CO_2$ permeation behaviors of blend membranes were affect by blend composition. Thermoplastic polyurethane(PU)-based membranes showed high $CO_2$ permeation and $CO_2$/$N_2$ selectivity of the blend membrane was improved with increasing the blend ratio.