• 한국진공학회:학술대회논문집
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• 한국진공학회 1999년도 제17회 학술발표회 논문개요집
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• pp.79-79
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• 1999

The varous techniques for fabrication of si or metal tip as a field emission electron source have been reported due to great potential capabilities of flat panel display application. In this report, 240nm thermal oxide was initially grown at the p-type (100) (5-25 ohm-cm) 4 inch Si wafer and 310nm Si3N4 thin layer was deposited using low pressure chemical vapor deposition technique(LPCVD). The 2 micron size dot array was photolithographically patterned. The KOH anisotropic etching of the silicon substrate was utilized to provide V-groove formation. After formation of the V-groove shape, dry oxidation at 100$0^{\circ}C$ for 600 minutes was followed. In this procedure, the orientation dependent oxide growth was performed to have a etch-mask for dry etching. The thicknesses of the grown oxides on the (111) surface and on the (100) etch stop surface were found to be ~330nm and ~90nm, respectively. The reactive ion etching by 100 watt, 9 mtorr, 40 sccm Cl2 feed gas using inductively coupled plasma (ICP) system was performed in order to etch ~90nm SiO layer on the bottom of the etch stop and to etch the Si layer on the bottom. The 300 watt RF power was connected to the substrate in order to supply ~(-500)eV. The negative ion energy would enhance the directional anisotropic etching of the Cl2 RIE. After etching, remaining thickness of the oxide on the (111) was measured to be ~130nm by scanning electron microscopy.

• 한국어병학회지
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• 제11권2호
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• pp.119-127
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• 1998

기생성 요각류 2종, Clavellopsis hugu(Lernaeopodidae; Siphonostomatoida)와 Taeniacanthus yamagutii(Taeniacanthidae; Poecilostomatoida)이 한국산 양식 황복의 구강, 코, 표피 등에 기생하고 있음을 국내에서 처음으로 보고하며, 아울러 이종의 형태학적 특징을 상세히 기술하였다. Clavellopsis huge의 체형, 제2 촉각, 큰 턱 및 제2 소악 등은 다른 종과 쉽게 구별된다. 암컷의 두흉부는 동쪽으로 휘어져 있으며, 제2 촉각은 2분지, 큰 턱의 날은 톱니 모양, 제2 소악은 두흉부 기저에 완전히 융합될 bulla 형태이다. 수컷의 두흉부와 몸통은 완전히 융합된 난형이며, 두쌍의 악각은 집게형이다. Taeniacanthus yamagutii의 주요 특징은 제2소악이 견고하고, 악각의 갈고리 기저에 돌기가 있으며, 제2-4 바깥 다리의 가시 끝에 촉각이 1개씩 있다. 이들은 모두 한국 미기록종이며, 양식산 복어(Takifugu obscurus)는 새로운 숙주이다.

• 한국전산유체공학회지
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• 제18권3호
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• pp.8-13
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• 2013

Drag reduction of a running vehicle is very important issue for the energy savings and emission reduction of its power train. Especially for a solar powered electric vehicle, the drag reduction and weight lightening are two serious problems to be solved to extend its driving distance under the given energy condition. In this study, the ground effect of an airfoil shaped road vehicle was studied for an optimum body design of an ultra-light solar powered electric vehicle. Clark-Y airfoil type was adopted to the body shape of the model vehicle to reduce aerodynamic drag. From the study, it was found that the drag of the model vehicle was reduced as the height(h) between ground and the lower surface of the model vehicle was decreased. It is due to the reduction of the down-wash decreasing the induced drag of the vehicle. The lift was also decreased as the height decreased. It is due to the turbulent boundary layer developed beneath the vehicle body. The drag is classified into two types; the form and friction drag. The fraction of form drag to friction one is 76 to 24 on the model vehicle. As the height(h) of the model vehicle from the ground surface increases the form drag also increases but the friction drag is in reverse.

• 한국수산과학회지
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• 제37권6호
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• pp.478-484
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• 2004

On 11 June 1991, eggs from the brood stock of small yellow croaker (Larimichthys polyactis) were artificially fertilized using the standard dry method and were hatched. Each of the fertilized eggs (1.1-1.2 mm in diameter) had an oil globule and was transparent and buoyant. The fertilized eggs hatched in a range of water temperatures $(17.5-20.3^{\circ}C)$ 44 hrs after fertilization. The total lengths of the newly hatched larvae were 3.1-3.3 mm, and these hatchlings had 31 myotomes (10+21). Melanophores and yellow-brown chromatophores were concentrated on the head, at the ventral part of the yolk, and in the middle of the tail. Four days after hatching, the larvae completely absorbed the yolk and became flexions of 5.1-5.5 mm in total length. Fifteen days after hatching, one spine (the anterior tip of the maxillary) appeared in the upper jaw and three spines developed at the upper parts of the eyes and on the posterior part of the head. At this stage, the larvae were approximately 8.3 mm long. Thirty-nine days after hatching, juveniles (1.9-3.4 mm in total length) had a pointed tail fin. By 66 days after hatching, the juvenile fish (about 4.0-6.5 mm in total length) were similar to adult fish in body shape. The larvae of L. polyactis could be distinguished from those of L. croacea by two distinct characteristics: the large number of vertebrae (28-29), and a relatively small bony ridge on the occipital region of the head.

• 복식문화연구
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• 제13권1호
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• pp.102-120
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• 2005

Three Jang-Ue's and eleven drapery were investigated in the excavated costume in Ue-Ryeong, Gyeong-Sang-Nam-Do. Three Jang-Ue's have three different colors. the length, the width, and the wide of quilting are different as well. The outer collar of a coat is a double collar while the inturned collar is a single collar. In case of Dark blue and Pink Jang-Ue. The large section of cloth forming the body of a Korean coat is getting narrower while the reinforcing cloth strip is getting wider as the time is passing by. All the three Jang-Ue's have the different handling methods of a attached to the top border of a Korean coat, and Pink Jang-Ue doesn't have a attached to the tip border of a Korean coat. The handling method of the hemline are all different. And the handling method of the cuffs are all different. The silk is main in the woven goods, partly hemp, mixed fabrics and cotton. Especially complex gauze with supplementary wefts that were found unusually in Cho-Sun Dynasty are very import to study the complex gauze. The fond relics of the Jeon-Ui Lee family reveal various formational methods and specific characters of the excavated costume. There fore these that bring the Jang-Ue shape and the textile's feature in Gyeong-Sang-Nam-Do region, from 16th to 17th are very valuable.

• 한국산림과학회지
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• 제80권3호
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• pp.296-302
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• 1991

본 연구(硏究)는 압축이상재가 현저하게 발달되어 있는 낙우송(落羽松)(Taxodium distichum Rich.)의 기재(技材)로부터 압축이상재율과 편심율 변이에 따른 압축이상재와 대응재의 해부학적(解剖學的) 특성(特性)을 비교(比較)하고자 실시하였다. 압축이상재의 조직학적(組織學的) 특성(特性)은 가도관의 둥근형태, 춘재로부터 추재로의 매우 점진적인 가도관 이행(移行), 가도관 선단부의 뒤얽힘 및 나선강(螺旋腔)과 세포간극의 존재 등에 있어 대응재와 다른 특성(特性)을 나타내었으며, 이러한 조직학적(組織學的) 특성(特性)은 압축이상재율과 편싱심률에 관계없이 유지하는 경향을 보였다. 수량적(數量的) 특성에 있어서도 압축이상재는 가도관장(假導管長)이 대응재보다 짧은 특성을 보였으나 방사조직(放射組織) 밀도(密度)와 단열방사조직(單列放射組織)의 수(數)는 압축이상재가 대응재보다 많았다. 그리고 단열방사조직의 세포고(細胞高)는 대응재가 압축이 상재보다 더 큰 특성(特性)을 나타내었다.

• 한국강구조학회 논문집
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• 제23권6호
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• pp.691-704
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• 2011

본 연구는 데릭크레인과 인양중인 새그먼트 자중에 의한 외력이 작용하는 시공중인 폐합 직전 사장교의 기하비선형성 및 재료비선형성을 고려한 비선형 해석을 통해 극한 거동을 규명하였다. 시공중 사장교의 상태를 수치적으로 구현하기 위해 초기형상 해석과 역방향 시공단계 해석을 순차적으로 진행하였고, 이후에는 데릭크레인 및 인양중인 새그먼트 자중을 중앙경간 최 측단에 재하 하여 폐합 전 강사장교의 주요한 거동을 모사하였다. 또한 주요 매개변수에 따른 극한거동 및 극한하중계수의 변화를 정량적으로 분석하기 위한 방법으로 주탑-거더간 강성비와 케이블 면적을 변화하면서 거동을 관찰하였고, 기하비선형성과 재료비선형성 모두를 고려한 극한해석 결과를 기하비선형성만을 고려한 기하비선형 해석과 비교하여 보다 구체적이고 정량적인 극한거동에 대해 분석하였다.

• 식물병연구
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• 제12권1호
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• pp.58-61
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• 2006

2004년부터 2006년까지 경남 창원시 대산면 북부마을 여주재배 농가에서 Botrytis cinerea에 의한 여주 잿빛곰팡이 병이 발생하였다. 병징은 과실과 줄기 부분이 수침상으로 물러지면서 부패되며, 줄기에 심하게 감염될 경우 시들어 말라 죽고 병반부위에 회색의 곰팡이가 많이 형성된다. 분생포자는 무색, 단포자이며 난형 또는 타원형으로 크기는 $6{\sim}20X4{\sim}12{\mu}m$였고, 분생포자경 위에 분생포자가 많이 형성되었다. 분생포자경은 갈색으로 격막이 있고, 폭은 $14{\sim}30{\mu}m$였다. 균사생육과 균핵형성 적온은 $20^{\circ}C$였다. 병원성 검정은 코호의 가설에 따라 수행하여 병원성을 확인하였다. 병반에서 분리한 병원균의 균학적 특징을 조사한 결과 Botrytis cinerea Persoon: Fries에 의한 여주 잿빛곰팡이병으로 동정되었다.

• 동의생리병리학회지
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• 제22권1호
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• pp.226-233
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• 2008

BangPungTongSung-San is usually perscribed in Hyungsang medicine for those of Yangmyung type, Pung type, those who have inner fever as well as redness of the tip of the nose, and for those with the external shape who tend to have dandruff. Following conclusions were obtained from the treatment of 8 patients suffering from inflammatory dermatitis. The causes of inflammatory dermatitis are mainly wind-fever, poisonous fever of the Samcho, dry-fever, and congenital conditions. The inflammatory dermatitis usually occurre to people who belong to Yangmyung types having vigorous Yangmyung meridian and body heat. Some patients who did not belong to the Yangmyung type were either those with much body heat or having congenital conditions inherited from their parents. There was no difference in the frequency of disease between men and women. The disease occurred at the times bodily conditions were weak or significant physiological changes took place. The term for the treatment required at least 3 months. Three more months are considered to be needed in treatment even after the completion of the remedy observing the return of the disease. The inflammatory dermatitis is easily occurred and recurred to those who belong to Yangmyung type and therefore the best prevention would be appropriate diet and bodily manner in daily life.

• 비파괴검사학회지
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• 제13권3호
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• pp.7-13
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• 1993

AISI 4130 금속재를 사용한 균열 컴팩터 인장시편의 파괴거동이 음향방출(AE) 및 초음파 C-scan을 이용하여 조사되었다. 모든 시편들을 특정 수준의 하중까지 증가시키면서, 크랙 개구변위 (COD)와 더불어 여러가지의 음향방출 인자들을 얻었다. 크랙 선단의 크랙 개구변위와 손상(소성)역을 계산하기 위하여 탄소성 유한요소 해석이 수행되었다. 펄스-반사, 침수형으로한 초음파 C-scan은 손상역 크기와 상사시키기 위하여 행해졌다. 유한요소 해석 결과와 측정된 크랙개구변위는 만족할 정도로 일치하였다. 음향방출 결과에서, 시험시편들은 연성거동을 나타내었다. 총 사상수대 크랙 개구변위의 기울기는 크랙 개시점을 결정하는 데에 유용하였다. 예비 시험적인 C-scan 화상은 손상역의 초음파 진폭변화를 보여주었고, 손상역의 형상 및 크기가 유한요소 결과와 정성적으로 부합되었다. 손상역 크기에 관한 추가적인 연구가 요약되었다.