• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.02a
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• pp.29-34
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• 2002

주요 결과를 요약하면 다음과 같다. 가. 벼 종자, 상토, 흔합 접착액 등 펠렛재료를 스크류 컨베이어에 의해 회전 성형롤에 공급, 압축성형 배출함으로써 직경 12 mm의 구형 벼 펠렛종자를 제조할 수 있는 벼 펠렛종자 제조장치를 설계·제작하였다. 나. 설계·제작된 벼 펠렛종자 제조장치의 제조능력은 시간 당 약 13,000 개 ∼ 37,000 개인 것으로 나타났고 이때 성형률은 약 61% ∼ 71%였다. 하지만 벼 종자 손실률은 약 17% ∼ 48%로 매우 큰 것으로 나타나, 펠렛재료의 손실과 종자손상을 줄이기 위한 성형롤 및 펠렛재료 공급장치의 개선이 필요한 것으로 보인다. 다. 제조된 펠렛종자의 무게는 제조 직후에는 1.66 g, 완전 건조 후에는 약 1.3 g으로 나타났으며, 제조된 펠렛종자의 직경은 약 12.0 mm에서 건조 후 약 11.2 mm로 축소되었다. 라. 제조된 한 개의 벼 펠렛종자 내 포함된 벼 종자의 개수는 상토와 벼 종자의 혼합비에 따라 다르게 나타났는데 혼합비 6 : 1에서 펠렛종자 당 종자 개수는 4.1 립, 혼합비 7 : 1에서 3.6 립, 그리고 혼합비 8 : 1에서는 3.1 립으로 나타났다. 마. 건조 후 벼 펠렛종자의 압축강도를 측정한 결과 건조기를 이용한 경우는 118 N ∼ 137 N, 음지 건조의 경우는 88 N ∼ 108 N으로 조사되었으며, 대체적으로 운반 및 파종 과정에서의 취급성은 문제가 없을 것으로 보인다.

• Korean Journal of Head & Neck Oncology
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• v.9 no.1
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• pp.88-90
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• 1993

병변의 양상에 따른 감별진단 재발성 이하선 종대를 보이는 경우 타액선조영술이 영상진단방법중 1차적인 선택이 된다. Stensen 씨관이나 중심선관(central glandular duct)의 확장을 보이는 경우 만성 타액선염으로 진단할 수 있다. 소아에서의 단일성 양성종괴의 감별진단은 임파절, 혈관종, 양성혼합종양, 저급점액상피암, 임파관종 등이다. 성인에서의 단일성, 양성으로 관찰되는 종괴는 양성혼합종양, Warthin씨 종양, 저급점액상피암, 선상낭성암, 소포상세포암 등이다. 여러개의 종괴를 보이는 경우 Warthin씨 종양, 소포상세포암, 임파종, 육아종, 전이암 등이며 단일성 낭성종괴의 경우는 branchial cleft cyst,, Warthin씨 종양, 상피낭포 등이다.

• Journal of the East Asian Society of Dietary Life
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• v.6 no.2
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• pp.177-186
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• 1996

This study attempted to examine the sensory quality, the degree of gelatization, color, texture and moisture content of Backsulgi added with Jobs'tears and Brown rice. The results were as follows: In sensory quality Backsulgi added with 10% Jobs'tears and Brown rice showed the most favorable sensory evaluation. In view of color, flavor, afterswallowing and overall quality, 10% Backsulgi was preferable than those of other Backsulgi added with Jobs'tears and Brown rice. The moisture contents was about 36-40%. There are not changed after 24hr and 48hr. L-value on the control group was high, 90.08. and Al, A2, A3 and A4 group were 80.65, 71.63, 68.66 and 61.50 respectively. L-value on the Backsulgi added with Jobs'tears was decreased as the amount of Jobs'tears. The gelatinization of Backsulgi added with Jobs'tears and Brown rice was Increased as the amount of Jobs'tears and Brown rice.

• Journal of the Korean Wood Science and Technology
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• v.31 no.4
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• pp.81-90
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• 2003

In this study, we investigated the weathering properties of Korean Rhus lacquers containing tung oil and their potential use as exterior coatings. The finished lacquers were prepared with a raw Korean Rhus lacquer or refined Korean Rhus lacquer content of 10, 20, 30 and 40 wt.% (corresponding to ratios of 10/90, 20/80, 30/70 and 40/60 by weight of Korean Rhus lacquer/tung oil, respectively). The curing temperature of the prepared lacquer increased with increasing the content of the raw Korean Rhus lacquer. This increased curing temperature is related to higher proportion of hydroxyl groups in the prepared lacquer, due to the content of the raw Korean Rhus lacquer. In accelerated weathering testing, the changes in the gloss and contact angle of the prepared lacquers showed a similar trend to that of traditional exterior oil stain. In addition, the prepared lacquers containing tung oil showed greater discoloration than traditional exterior oil stain. However, the discoloration of the prepared lacquer with a raw Korean Rhus lacquer content of 40 wt.%, and that of the prepared lacquer with refined Korean Rhus lacquer contents of 30 wt.% and 40 wt.%, showed a similar trend to that of traditional exterior oil stain. Consequentially, these prepared lacquers showed a potential for being used as exterior coatings.

• Composites Research
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• v.17 no.4
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• pp.25-31
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• 2004

In this study, a refined beam analysis model has been developed for multi-celled composite blades with elliptic cross-sections. Reissner's semi-complimentary energy functional is introduced to describe the beam theory and also to deal with the mixed-nature of the formulation. The wail of elliptic sections is discretized into finite number of elements along the contour line and Gauss integration is applied to obtain the section properties. For each cell of the section, a total of four continuity conditions are used to impose proper constraints for the section. The theory is applied to single- and double-celled composite blades with elliptic cross-sections and is validated with detailed finite element analysis results.

• Proceedings of the Korean Vacuum Society Conference
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• 2000.02a
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• pp.161-161
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• 2000

Ferromagnetic 3d 전이금속과 paramagnetic 5d 금속으로 이루어지진 Pt-Co 계는 자기이방적 (magnetic anisotropy) 성질로 인하여 많은 관심을 모으고 있는 계로서는 다층박막 및 합금박막에 대한 지기적 성질에 대한 많은 연구가 있어 왔다. 최근 sputtering method 에 의해 제작된 Pt-Co 합금박막에 대해 Ar 기체분압에 따라 보자력 (coercivity)이 변화되고 PMA (perpendicular magnetic anisotropy)를 갖는 것을 관측하였다. PMA의 근원은 주로 계면에서의 anisotropy 에너지와 관련이 있는 것으로 이해되기 때문에 합금박막의 경우는 PMA가 불가능한 것으로 여겨져 왔다. 그럼으로서 PMA에 대한 근원에 대한 명확한 해석이 필요하게 되었다. 또한 보자력(coercivity)은 불순물의 함량이 감소할수록, 그리고 내부적 변형이 제거될수록 감소하기 때문에, 계면 및 결정구조와 관련이 있는 것으로 알려져 있다. 이러한 자기적 특성을 관찰하고자 [Pt(51 )/Co(112 )]4, [Pt(90 )/Co(66 )]4, 그리고 [Pt(121 )/Co(30 )]4, 다층박막과 이들 박막을 80kV Ar+ 이온선 혼합후 박막의 결정성 변화를 관찰하기 위하여 GXRD (glancing x-ray diffraction) 스펙트럼을 얻어보았다. 그 결과 세 system 모두 disordered fcc 합금박막임을 확인하였다. fcc(111) 방향에 대한 평균 격자공간(lattice spacing)의 크기변화는 한층 당의 Co 두께가 두꺼울수록 거의 선형적으로 감소함을 볼수 있었다. MOKE 실험에 의하면, 이들 다층박막이나 합금박막의 경우 모두, in-plane 방향에 대해 자화 용이축(easy magnetization axis)을 가지고 있었다. 그리고 보자력의 크기에 있어서, 다층 박막의 경우에 있어서 Co 층에 두께 두꺼울수록 보자력의 크기가 감소하였지만 그림1에서와 같이 합금박막의 경우는 정반대로 Co층의 두께가 얇을수록 보자력의 크기가 감소함을 관찰하였다.

• Tuberculosis and Respiratory Diseases
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• v.47 no.6
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• pp.836-842
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• 1999

Background: Mixed obstructive and restrictive pattern of spirometry can not be concluded in the presence of true restrictive disorders because pure obstructive disorders can also show reduced vital capacity. However, it is not known how many patients with mixed spirometric pattern really have restrictive disorders in Korea whose pattern of pulmonary diseases is somewhat different from foreign countries. To answer this question, I performed this study and tried to answer it according to diseases in addition. Method: Test results from 413 patients who undergone both spirometry and lung volume measurements on the same visit from August 1, 1998 to July 31, 1999 were included. Spirometry data were classified as mixed obstructive-restrictive pattern when spirometry showed '$FEV_1/FVC$<70% (<65% if age$\geq$60)' and FVC<80% of predicted value'. TLC by the method of nitrogen washout was considered as gold standard to diagnose restrictive disorders in which TLC is less than 80% of predicted value. Results: Out of 404 patients who could be evaluated, 58 had mixed pattern of spirometry. 58 patients were suffered from airway diseases(39 patients) such as COPD(22 patients, 38%), asthma(11, 19%), bronchiectasis (6,10%), and sequelae of pulmonary tuberculosis(15, 26%) or other diseases(4,7%). Only 18 out of 58(31%) were confirmed to have true restrictive disorders by TLC. The proportion of true restrictive disorders was different according to diseases, 20.5%(8/39patients) in patients with airway diseases and 53.3%(8/15) with sequelae of pulmonary tuberculosis(p<0.05). Conclusion: Many patients whose spirometry showed mixed pattern didn't have restrictive disorders but had pure obstructive disorders. This was true for more patients with airway diseases. Therefore it would be prudent that lung volume be tested to diagnose restrictive disorders in patients with mixed spirometric pattern.

• Journal of Life Science
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• v.21 no.7
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• pp.1016-1024
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• 2011

The concentrations of bioactive material (polyphenolics and flavonoids) and the biological activities of antioxidative (DPPH [${\alpha},{\alpha}'$-diphenyl-${\beta}$-picrylhydrazyl] free radical scavenging activity, peroxidation of rat liver microsome, and Fe/Cu reducing power), ${\alpha}$-glucosidase inhibition, tyrosinase inhibition, and fibrinolytic activity were tested by in vitro experimental models using 70% methanolic extract from Ganoderma lucidum, Momordica charantia, Fagopyrum tataricum and their mixtures. The highest yield and the concentrations of polyphenolics and flavonoids were shown in the mixture extract. Mixture extract was shown to have the highest activities of ${\alpha}$-glucosidase inhibition and tyrosinase inhibition, fibrinolytic, DPPH free radical scavenging, and Fe/Cu reducing power in a concentration-dependent manner. From these results, mixture methanol extract was shown to have the most potent bioactive properties and to contain large amounts of biological materials such as polyphenolics and flavonoids. This mixture could be a good dietary supplement material candidate, such as for antidiabetic functional foods.

• Journal of Energy Engineering
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• v.14 no.1
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• pp.62-71
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• 2005

An experimental study on thermal mixing of steam jet condensation through the I-Sparger of APR1400 design using B&C (Blowdown and Condensation) test facility. Due to the limit of the steam supply capability of the pressurizer, transient thermal mixing experiments were conducted. Temperature distributions in the quench tank were measured using thermocouples located at various positions. From the experimental data, local temperature variations for various locations and vertically cross-sectional temperature distributions for several times were depicted and presented. The result shows the characteristics of thermal mixing of the I-Sparger depending on the design features of the I-Sparger.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.11 no.8
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• pp.1392-1398
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• 2000

In this paper, Sub Harmonic Ring Mixer using Anti-Parallel Diode Pair is studied. Conventional mixers mix LO signal with RF signal and, obtain IF signal from the difference between LO and RF. Sub harmonic ring mixers using APDP mix RF signal with the second harmonic of LO signal, LO frequency needed for conventional receiver is reduced by 1/2.The produced mixer showed 12 dB conversion loss, and 1 dB compression point of IF signal, in respect to RF signal, was found at the 0 dBm RF signal. Isolation LO/IF and LO/RF is 24.6 dB and 22.5 dB respectively. Isolation RF/LO and LO/RF is 32.6 dB and 22.5 dB respectively.