• Journal of the East Asian Society of Dietary Life
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• v.3 no.2
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• pp.155-163
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• 1993

This study was conducted to investigate the optimal condition of the extraction of red pepper oleoresin. The yield of oleoresin form red pepper was 24~28% when it was extracted by ethanol and methanol. and 8~10% by acetone, ethylene dichloride and n-hexane. But more than 60% of portion in alcohol extracts were moisture and sugars. Capsaicin and pigment were extracted more than 70% of those in red pepper when it was extracted by ethylene dichloride Those useful components were extracted most efficiently by mixed solvents of ethanol and ethylene dichloride at the ratio of 50:150. other extracting conditions were investigated in this studies, such as optimal extraction time was more than 3 hours, temperature was 55$^{\circ}C$ and particle size was finer than 250 mesh

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.13 no.1
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• pp.18-24
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• 2001

Woven wire wick is very effective structure because of its easiness to insert inside of pipe for a miniature heat pipe. The present study was conducted to investigate the effect of the effective flow passage with respect to wire helix angle. Also effective thermal conductivity were examined by defining mean porosity considering effective liquid flow passages. Effective heat transfer area is varied with respect to wire helix angle, and in the range of $\thet=60~65^{\circ}C$, heat transfer area is decreased about 15~20%. Permeability of woven wire wick shows similar value of 200 mesh screen wick. And comparison of experimental results on effective thermal conductivity shows a fairly good agreement with the analytical results.

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.1
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• pp.104-109
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• 1996

고추의 효능을 높이기 위한 방법의 하나로 향신성 분을 보유하면서 자기저자이 가능한 oleoresin을 추출하여 유화제로 수용성을 부여시킨 후, 이때의 유화안 정성과 고온에서 조리를 하였을 때 고추 oleoresin의 항산화 활성을 검토하였다. 100mesh로 분쇄한 고추에 증류수에 가하여 감압증류시켜 정유성분을 추출하고, 잔사에 에틸 알코올을 가하여 $25^{\circ}C에서$ 3시간 진탕 추출한 후 여과, 농축시켜 정유성분과 합하였다. 여기에 물과 유화제 (PGDR)를 첨가, 유화시켜 고추 oleoresin으로 하였다. $60^{\circ}C에서$ 24시간 방치했을때의 enulsion 생성율은 PGDR을 4% 첨가한 경우가 94.5%로 가장 높았고, 또한 100분간 원심분리(200$\times$g) 시킨 후에도 emulsion 잔존율은 80%정도로서 유화안전성이 가장 좋았다. 고추 oleoresin의 항산화 활성은 가열조리 온도 100$\times$의 경우 BHA의 효과 만큼은 미치지 못하나 상당한 항상화성을 나타내었고, 온도 $150^{\circ}C의$ 경우는 BHA 첨가와 마찬가지로 항산화성 효과를 인정하기 어려웠다.

• Proceeding of EDISON Challenge
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• 2012.04a
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• pp.57-60
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• 2012

본 연구에서는 현재 국내외에서 연구 중인 Blended Wing Body(BWB) 항공기의 엔진흡기 유동을 해석하기 위해 익형과 비행조건을 변화시켜 가며 전산유체해석을 수행하였다. 엔진의 위치에 따라 엔진이 효율적으로 동작하기 위한 조건인 흡기에서의 유동 속도와 그 분산을 중심으로 해석한 결과 익형 표면에서는 경계층의 영향으로 엔진흡기에서 유동속도가 낮고, 속도분산이 높음을 확인할 수 있었다. 한편, 익형 아랫면에서는 높은 비행속도에서 속도분산이 급격히 증가하였다. 이를 통해, 해석에 사용한 익형이 BWB의 동체로 활용하기에 적합한 엔진흡기조건을 갖는지 판별하였다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.29 no.3
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• pp.442-447
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• 2000

당귀 유용성분의 신속한 추출방법을 개발하기 위한 기초연구로써, 기존 추출방법들에 비하여 환경친화적이고 경제적인 장점이 알려진 마이크로웨이브의 추출조건을 검토하였다. 가용성 당귀성분의 MAP추출에서 당귀의 입자 크기는 60 mesh, 시료와 용매의 비는 1:10(g/mL) 이 적당하였고, microwave power는 80 W에서 당귀성분의 추출효율이 높았다. 가용성 고형분과 decursin 함량을 동시에 가장 많이 추출할 수 있는 50% 에탄올을 용매로 하였을 경우 5분간 3회 반복 추출로써 decursin을 포함한 대부분의 가용성 성분을 추출할 수 있었다.

• 한국연소학회:학술대회논문집
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• 2012.04a
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• pp.25-27
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• 2012

In this paper, combustion process in the perforated silicon carbide(SiC) tube using a two dimensional approaches with GRI Mechanism 1.2 was investigated. The computational mesh structure which is divided into $60{\times}15$ and boundary conditions are set to constant mass flow rate at the inlet and constant pressure condition at the outlet respectively. Its result shows that the temperature on this peak was roughly 100K higher than the adiabatic flame temperature of 2223K for a free laminar flame at these conditions.

• Korean journal of food and cookery science
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• v.7 no.4
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• pp.9-13
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• 1991

Nochi is a kind of Korean traditional food made from glutinous rice or millet. This study attempted to examine the effects o( the various factors and to clarify the factors which affect the overall eating quality of Noch. The results were summarized as follows. 1. Starch content of waxy rice was 72.4% and IBC was 0.017%. 2. $\alpha$-amylase and $\beta$-amylase activity of malt were 40.13 and 8.94 units respectively. 3. Waxy rice soaked for 3 hours was ground to flour then sifted 20 mesh sieve. The mixture of waxy rice and malt was steamed for 20 minutes. 4. In sensory evaluation on varying the amount of malt and incubation time, the most favorite tendancy of the overall eating quality was at the level of 8hours incubation made by 5% addition of malt. 5. Total sugar contents, reducing sugar contents and the intensities of iodine stain at the incubation temperature of $60^{\circ}C$ were significantly different from those at $50^{\circ}C$.

• Journal of the Korean Society of Visualization
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• v.16 no.1
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• pp.54-60
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• 2018

It is important to develop more efficient and productive casting processes for an automated high precision molten-metal casting system. Detailed analysis of molten-metal flow in the casting process by the numerical approach will help to optimize the control of a ladle. In this study, the smoothed particle hydrodynamics method was applied to analyze casting flow characteristics with different tilting angular speed and initial molten-metal level. The smoothed particle hydrodynamics technique has advantages to easily handle non-linear free surface behavior with the absence of a computational mesh. We found that tilting angular speed has relatively greater effect on the casting flowrate and that the effect of the initial molten-metal level is only minor. Further extensive study will be necessary to find an optimal condition for high efficient casting system.

• Journal of the Korean Wood Science and Technology
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• v.24 no.2
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• pp.42-45
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• 1996

A residue from the newsprint waste was investigated as a filler in adhesive for bonding southern pine plywood. The residue was prepared by drying the wet residue to 8% moisture content and grinding the dry material using a laboratory Wiley mitt with a 75-${\mu}m$(200-mesh) screen. The residue was compared to a commercial filler commonly used in structural plywood adhesives. A total of 48 three-ply panels. 12.7mm nominal thickness and 0.3 by 0.3 m in size, were fabricated at two press times(4 and 5 min) and three assembly times(20, 40 and 60 min). Evaluations of the residue were carried out by performance tension shear tests after two 4-hour boil accelerated aging tests on plywood. The test results included tension shear strength and estimated wood failure values. All plywood made with the residue filler were comparable to the control-bonded plywood. These results indicate that residue from the newsprint waste streams would be suitable as filler for plywood adhesives.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.179-182
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• 2011

노트북컴퓨터 및 스마트폰을 비롯한 무선랜을 사용하는 이동기기들의 폭발적인 보급에 따라 과도한 무선 트래픽을 처리하기 위한 기술개발이 절실하다. 본 논문에서는 MIM기능이 구현된 무선인터페이스를 가지는 노드들의 적절한 배치를 통해 시스템성능을 향상시키는 방법에 대해서 소개한다. 두 노드간의 거리에 기반한 간단한 MIM캡쳐 확률 모델을 바탕으로 무선 메시노드를 배치하면 동시전송이 가능해져서 기존의 IEEE802.11 DCF를 기반으로 동작하는 무선메시망에 비해 데이터 처리율이 크게 향상될 수 있다. 우리는 시물레이션을 통한 성능검증을 통해 MIM캡쳐를 활용하는 무선메시망 배치구조가 DCF에 기초해서 동작하는 망에 비해서 약 60% 정도의 처리량 향상이 있는 것을 확인하였다.