• Current Research on Agriculture and Life Sciences
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• 제1권
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• pp.159-163
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• 1983

저장(貯藏)사과주의 산막(産膜)을 방지(防止)할 목적(目的)으로 사과주 양조장내(釀造場內)의 산막(産膜)이 형성(形成)된 저장(貯藏) 사과주에서 산막효모(産膜酵母) 45종(種)을 분리(分離)하고 그중(中) 가장 뚜렷한 산막생성능(産膜生成能)을 나타내는 균주(菌株) FY-4, FY-5를 선별(選別)하였다. 2균주(菌株) 중(中) FY-5는 분류학적(分類學的) 제성질(諸性質)로 보아 Hansenula beijerinckii 또는 그 근연균(近緣菌)으로 동정(同定)되었다.

• Food Science and Biotechnology
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• 제18권4호
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• pp.889-894
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• 2009

Barley proteins are expected to have unique functional properties due to their high content of alcohol soluble protein, hordein. Since the barley proteins obtained by conventional isoelectric precipitation method cannot represent hordein fraction, barley proteins were fractionated to albumin, globulin, glutelin, and hordein with respect to extraction solvents. Functional properties and film-forming properties of solubility-fractionated barley proteins were investigated to explore their potential for human food ingredient and industrial usage. The 100 g of total barley protein comprised 5 g albumin, 23 g globulin, 45 g glutelin, and 27 g hordein. Water-binding capacities of barley protein isolates ranged from 140-183 mL water/100 g solid. Hordein showed the highest oil absorption capacity (136 mL oil/100 g), and glutelin showed the highest gelation property among the fractionated proteins. In general, the barley protein fractions formed brittle and weak films as indicated by low tensile strength (TS) and percent elongation at break (E) values. The salt-soluble globulin fraction produced film with the lowest TS value. Although films made from glutelin and hordein were dark-colored and had lower E values, they could be used as excellent barriers against water transmission.

• JSTS:Journal of Semiconductor Technology and Science
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• 제15권1호
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• pp.16-21
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• 2015

In this study, the effects of forming gas post metallization annealing (PMA) on recessed AlGaN/GaN-on-Si MOSHFET were investigated. The device employed an ICPCVD $SiO_2$ film as a gate oxide layer on which a Ni/Au gate was evaporated. The PMA process was carried out at $350^{\circ}C$ in forming gas ambient. It was found that the device instability was improved with significant reduction in interface trap density by forming gas PMA.

• 미생물학회지
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• 제49권3호
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• pp.286-291
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• 2013

한국인의 저염 섭취 필요성에 부응하기 위해 14% (w/w) 염도의 된장 대신 8% (w/w) 저염 된장을 제조하였다. 숙성 후 8% 저염 된장 시료들은 14% 염 된장과 달리 모두 산막을 형성하였고, 이 산막 형성균들을 동정한 결과 8종 모두 효모인 Pichia kudriavzevii에 속하였다. 장류 고유한 풍미를 유지하기 위해 발효 특성이 우수한 11종의 Bacillus 균들을 전통 장류에서 분리했고, 이들의 생화학적 특성 및 16S rRNA 염기 서열 분석 결과 B. subtilis, B. licheniformis, B. methylotrophicus로 동정되었다. 이 균주들은 8종의 산막 효모에 대해 증식 억제 능력을 보였으며, 항균 계면활성제인 lichenysin 또는 surfactin 유전자들을 함유하고 있었다.

• International Journal of Air-Conditioning and Refrigeration
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• 제14권2호
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• pp.66-75
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• 2006

The effect of antifreeze solution liquid film on the frost prevention is experimentally investigated. It is desirable that the antifreeze solution spreads widely on the heat exchanger surface forming thin liquid film to prevent frost nucleation while having small thermal resistance across the film. A porous layer coating technique is adopted to improve the wettability of the antifreeze solution on a parallel plate heat exchanger. The antifreeze solution spreads widely on the heat exchanger surface with $100{\mu}m$ thickness by the capillary force resulted from the porous structure. It is observed that the antifreeze solution liquid film prevents a parallel plate heat exchanger from frosting. The reductions of heat and mass transfer rate caused by the thin liquid film are only $1{\sim}2%$ compared with those for non-liquid film surface.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1833-1836
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• 2008

Recently as the micro surface features become higher and diverse in their shapes, the releasing of the molded features becomes more crucial for manufacturing of the micro patterned products. The higher aspect ratio of the features or more complex shape of the features results in larger releasing force, elongation or cohesive failure of the features during the releasing. Another issue would be the uniformity of the released surface features after molding, especially for applications with large area surface. The micro patterned optical film, one of typical applications for micro surface features, consists of two layers, the thermoplastic base film and the micro formed UV resin layer. Therefore two interfaces are typically involved during the forming of this micro featured film; one is between the base film and the UV resin and another is between the resin and the pattern master. To improve the releasing of the molded surface features, the adhesive characteristic was investigated at these two interfaces. A PET film was used as a base film and two UV curable resins with different surface energy were prepared for different adhesiveness. Also the two different pattern masters were employed; one is made from brass-copper alloy and fabricated with PMMA. The adhesiveness at each interface was measured for some combinations of these base film, UV resins and the masters and the effect of this adhesiveness on the releasing was investigated.

• 공업화학
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• 제34권6호
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• pp.603-607
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• 2023

수성막포(aqueous film forming foam, AFFF)는 함정 유류화재 대응에 핵심적인 역할을 하는 주요 소화약제 중 하나이다. 이 형태의 소화약제는 막 형성, 열 제거, 연소 억제, 그리고 화학 물질 혼합물을 이용하여 화재를 진압하는 데 효과적이다. 이러한 특성은 유류화재 대응에 있어서 큰 장점을 제공하지만, AFFF는 폼 형태로 분사되어 화재에 대응하는 과정에서 기존 유체와 차별점을 가진다. 따라서 AFFF 폼의 레오미터를 활용한 유변학적 특성 분석은 함정 유류화재 대응을 위한 AFFF 분사 특성 예측에 핵심적인 역할을 수행하며, 이는 효과적인 화재 진압과 밀접한 연관이 있다. 본 연구에서는 레오미터 실험을 통해 AFFF 폼의 비뉴턴 유체(전단박화) 거동을 확인하였으며, 폼의 안정성과 직결되는 데이터들을 얻을 수 있었다. 이러한 실험 데이터들은 AFFF를 활용한 소화 시스템의 효율성을 높이는데 기여할 것으로 기대된다.

• Tribology and Lubricants
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• 제11권2호
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• pp.34-43
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• 1995

The boundary films formed in sliding on steel surfaces were characterized using various lubricants. The mechanism of boundary film formation and loss was investigated over a range of temperature. The thickness of the boundary films was monitored in-situ by an ellipsometer, and the composition of the films was analyzed by XPS. The performance of the lubricants is closely associated with boundary film forming ability. In order to achieve high load carrying capacity, a boundary film must be formed on the surface. Sliding is necessary to form the films and some time is also required. As temperature increases, chemical reactivity increases the film formation rate, while the film removal rate increases due to thg decrease of durability of the boundary film material. There is a balance between these two competing mechanisms and this balance is reflected in the boundary film thickness.

• Journal of the Korean Wood Science and Technology
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• 제23권2호
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• pp.55-69
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• 1995

The primary objective of this research was to investigate optimum manufacturing condition of thin composite panels composed of sawdust, polyethylene film and polypropylene net. At the study the experiment was designed to make thin board in which sawdust offers effectiveness as core composing material, polyethylene as adhesive with added urea resin, and polypropylene as stiffness and flexibility in the composition panel. 100 types of thin composite panels were manufactured according to press-lam and mat-forming process of various hot pressing conditions(pressure, temperature and time). They were tested and compared with control boards on bending properties(MOR, MOE, SPL, WML), internal bond strength, thickness swelling, linear expansion and water absorption. At the same time the visual inspections of each types of panels were accomplished. The physical and mechanical properties of composite types passed by visual inspection were analyzed by Tukey's studentized range test. From the statistical analysis, the optimum manufacturing condition of thin composite panels were selected. Compared with two manufacturing processes, mat-forming process performed better than press-lam process in all tested properties. The optimum manufacturing conditions resulted from the experiment and statistical analysis were able to determine as following: the press temperature was shown the most good result at 130$^{\circ}C$ in mat forming process and 140$^{\circ}C$ press lam process, the press time 4 min in both processes, but the press pressure was 25-10kg/$cm^2$ in mat forming and 15k/$cm^2$ press lam process.

• 소성∙가공
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• 제31권1호
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• pp.29-38
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• 2022

Recently, the composite material market is gradually growing. Various composite forming processes have been developed in order to reduce the production cost of the composite material. Unlike the conventional forming process, the microwave composite forming process has the advantage of reducing the processing time because the composite material is heated directly or indirectly at the same time. Due to this advantage, in this study, a double cantilever beam test was conducted with specimens manufactured by the microwave composite forming process. The purpose of this study was to compare mode-I energy release rate for specimens manufactured by prepreg compression forming and microwave composite forming processes. First, a microwave oven was proposed to conduct the microwave composite forming process. Double cantilever beam specimens were manufactured. After that, the double cantilever beam test was conducted to obtain the mode-I energy release rate. Mode-I energy release rates of specimens manufactured by the microwave composite forming and prepreg compression forming processes were then compared. As a result, mode-I energy release rates of specimens fabricated by the microwave composite forming process were similar to those fabricated with the prepreg compression forming process with a relatively reduced process time.