NC 가공을 위한 Ferguson 곡면의 오차 해석에 관한 연구

梁均懿,張鐘聲 全北大學校 1990 論文集 Vol.32 No.-

Sculputured surface are widely found in car body, ship hull and air plane parts. This paper covers computer-aided design of soulptured(or free-form) surface ; surface interpolation methods ; methods of generating CL-data for the machining of 3-D sculptured surface. The purpose of this paper is aimed to express how much we could show the real surface accurately comparing with the Ferguson surface used so many times, which is abtained from the 3-D point data through engineering calculation.

N-Arylnortropinone 유도체의 합성연구

李龍均,朴유미,鄭大一,金寅植,朴鍾勳,盧信愛,鄭逸守,朴敏洙 東亞大學校附設基礎科學硏究所 1998 基礎科學硏究論文集 Vol.15 No.1

Tropinone 화합물들은 색다른 고리계의 존재로 아주 오래전부터 약리학적으로 매우 흥미로운 연구과제로 주목되어 최근에 그들의 합성법,?? 입체적 구조분석?? 그리고 약리학적인 연구??가 활발히 진행되고 있다. Tropinone 1은 흔히 마약으로 알려져 있는 cocaine 2, 소염작용과 항경련성 작용 및 심장박동수를 조절 등 다양한 약리작용을 하는 tropane spirohy-dantoin ?? 그리고 안과질환을 검사 할 때 눈의 동공을 확장시키는 데 사용하는 atropine ??등을 합성하는 데 중요한 중간체이다. ??????????? Trigo, G, G등 ??은 aliphatic amine과 succinic aldehyde를 acetonedicarboxylic acid와 반응하여 nortropane 유도체를 합성하였으며, 그 후 [3+2] nitrone cycloaddition? 과 [3+4] cyclocoupling? 을 거치는 tropane alkaloid의 새로운 합성법이 개발되었다. 최근 lzquier M. L. 등¹은 acetonedicarboxylic acid를 사용하여 1차 지방족 amine과 succinic aldehyde대신 2,5-dimethoxytetrahydrofuran을 반응시켜 N-alkyl nortropinone 유도체를 합성하였다. 그러나 일반적으로 빙초산 속에서 amine과 2,5-dimethoxytetrahydrofuran을 반응시키면 pyrrole 유도체가 합성되어진다.?? 이러한 사실은 분명히 반응조건(예, 산, 온도)에 따른 다양한 화학이 존재한다고 볼 수 있다. 따라서 우리는 반응조건, 즉 산의 변화 및 온도 변화에 의한 amine과 2,5-dimethoxytetrahydrofuran의 반응을 자세하게 검토하면서 새로운 N-arylnortropinone 유도체를 합성하고자 한다.

자기 소호형 소자를 사용한 D급 고주파 인버터의 특성 평가 및 설계에 관한 연구

노채균,김동희,김종해,배영호 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2

This paper investigates and compares operating characteristics of the main power conversion circuit and extension of safety operating zone etc in case of use switching device of voltage-fed type high frequency Inverter with self-turn-off device to a case of using nature-commutated type devices. In addition, this paper induced operating characteristics of the main power conversion circuit by examination to normalized parameter. This paper propose that a base data of the main power conversion circuit of characteristics evaluation for frequency characteristics, output characteristics and load characteristics etc.

C₄유분을 이용한 옥텐류의 합성에 있어서 1,3-Butadiene의 함량에 따른 이량화 촉매의 수명에 관한 연구

전종기,한원희,조정호,고승태,노상균 동양대학교 2001 동양대학교 논문집 Vol.7 No.1

Selective hydrogenation of 1,3-butadiene in C4 raffinate was carried out in fixed bed reactor using Pd/a1unina catalysts, Concentration of 1,3-butadiene in C4 raffinate could be reduced under 100 ppm.The life of dimerization catalyst using C4 raffinate after selective hydrogenation was longer than that of dimerization catalyst without selective hydrogenation.It was found that dilution of olefin concentration in feed was effective to increase dimerization catalyst life.

Fusobacterium nucleatum의 유황화합물 생성에 영향을 미치는 인자

오인근,박은혜,양규호,오종석 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.1

Fusobacterium nucleatum, one of the bacteria causing halitosis, produces the volatile sulfur compounds (VSC) such as H2S in the media containing sulfur components, and forms FeS by binding with iron component. The various factors of oral cavity affect the concentration of sulfur compounds produced by Fusobacterium nucleatum. In this study, the effect of nutrients and pH on the production of sulfur compounds by Fusobacterium nucleatum was studied with the following results; 1. The optical density of broth was increased to 0.817±0.032 and 1.297±0.024 by adding 1.0% sodium thiosulfate and 0.05% L-cysteine hydrochloride in the media, respectively. 2. Though the optical density of broth was 0.799 ± 0.032 by adding volatile sulfur compounds (VSC) only in the media, it was increased to 1.775±0.003 and 1.648±0.022 by adding xylitol combined with glucose and fructose, respectively. 3. The concentration of VSC was above 20,000 ppb in the media above pH 5.5. The optical density of broth was still high in the media with L-cysteine hydrochloride of higher concentration, being low in the media of lower pH. 4. The concentration of VSC was high when there was distilled water or saline solution on the media, and their amount was small. These results suggest that the production of sulfur compounds by Fusobacterium nucleatum is inhibited by xylitol and acid.

韓國産粘菌植物의 分類學的硏究

金鍾均,崔斗文 공주대학교 사범대학 과학교육연구소 1981 과학교육연구 Vol.13 No.1

The Myxomycetes and soils were collected in several area by the weather in korea and classified by the new classification system. The families, genera and species identified were newly recorded their korean names and the anatomical charts were reserved in particular. In the list of myxomycetes in korea, l class, 3 subclasses, 6 orders, 13 families, 30 genera, 106 species and 26 varieties were avnmerated. The total numbers of myxomycetes identified was 132 taxa. of these the following 4 species are Dictyo-form cellular slime molds. Di ctyosterium minutum Raper Dityosterium purpureum Oive Poly sphondy lium pallidum oive Polysphondy lium vielaceum Brefeld The species for the true slime molds which are new to the flora of kor-ea are as follows: Comotricho cylindrica(Bilgam) Machride Cribraria argillacea persoon cribraria minutissima Schweinitz Didymium difforme(persoon) Duby

밀폐형 온실의 과습 조건과 무선통신 성능 관계 규명

김태균, 송정원, 박소정, 오종우 忠北大學校 農業科學硏究所 2017 農業科學硏究 Vol.33 No.1

In order to utilize the ubiquitous sensor network technology, it is necessary to identify the communication characteristics of the sensor node. The purpose of this study is to investigate the wireless performance to be related the environment (i.e. humidity) which can cause data loss in the greenhouse environment. The performance of wireless communication was conducted in the constant temperature and humidity device. The results of performance for Zigbee communication were not affected by the humidity. The Zigbee communication without the data loss would be more effective to control the environment in the greenhouse.

유산구균 1370의 수용성 글루캔 형성에 영향을 미치는 인자

오인근,양규호,정진,오종석 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.2

Streptococcus mutans가 치태를 형성할 때, 유산구균 1370(Lactococcus lactis 1370)이 생산하는 수용성 글루캔이 영향을 미친다. 본 연구에서는 여러 인자에 의한 수용성 글루캔 형성 정도를 유산구균 1370 배양 상청액의 흡광도로 측정하여 다음과 같은 결과를 얻었다. 1. 5% 자당이 첨가된 M17 broth에서 유산구균 1370 배양 상청액의 흡광도는 높고 Streptococcus mutans 배양 상청액의 흡광도는 낮았으나, 통계학적인 유의성은 없었다. 2. M17 broth에 10% 자당을 첨가하여 유산구균 1370을 배양할시 배양 상청액의 흡광도는 첨가하지 않을 때보다 높았다(p〈0.05). 배지 pH가 5에서보다 7에서 배양 상청액의 흡광도가 더 높았다(p〈0.05). 3. 32℃, 37℃, 42℃중 37℃에서 배양시 배양 상청액의 흡광도가 가장 높았으나 통계학적인 유의성이 없었고, 호기성 배양시보다 혐기성 배양시 배양 상청액의 흡광도가 더 높았다(p〈0.05). 4. 배지의 CaCl₂농도가 1.0mM에서 (p〈0.05), KCl 농도가 2.5mM에서 (p〈0.05) 배양 상청액의 흡광도가 높았다. 5. M17 broth에 5% 자당을 첨가한 배지에 유산구균 1370을 접종하여 배양한 배양 상청액의 배지를 1:3으로 가한 비커와이어 검사에서 Streptococcus mutans에 의하여 형성된 인공치태 무게는 5.6mg으로 5% 자당을 첨가하지 않을 때의 103.0mg에 비교하여 현저히 감소하였다 (p〈0.05). 이상의 결과를 요약하면 유산구균 1370에 의한 수용성 글루캔의 형성은 자당이 함유된 배지나 세균 증식이 잘 되는 조건에서 증가하였으며, 수용성 글루캔이 Streptococcus mutans에 의한 인공치태 형성을 억제하였다.

조립식 대형판구조의 접합부강도와 내력특성간의 상관성

김재균,우종열,윤정배 慶尙大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.11 No.-

The 8 specimens are tested for vertical joint of PC large panel type. The comparison of the specimens having a different strength between grout concrete and panel is presented and other design parameters such as steel reinforcing ratio and location are varied. Test behaviors are discussed on crack patterns near shear-key, maximum shear and energy absorption capacities. If the relative strength of grout concrete is high, the results show more ductile and rely on the reinforcing loop bar than the case of same relative strength.

방사선을 조사한 생쥐 장기에서의 Superoxide Dismutase 분포에 대한 연구

김양균,전현우,차종희,고광삼,이근배 朝鮮大學校 附設 醫學硏究所 1986 The Medical Journal of Chosun University Vol.11 No.1

The cytosolic and mitochondrial supreoxide dismutases (EC 1.15.1.1) were investigated in various organs, thyroid gland, lung, heart, liver, spleen and kidney, of normal and irradiated mice. The mouse organs were fractionated into cytosolic and mitochondrial fractions by differential centrifugation, and the supsroxidp dismutase was measured by the method of McCord and Fridovich. The mouse organs contain two types of superoxide dismutase ; one is localized in the cytosol and contains cupper and zinc, the other in the mitochondria and contains manganese. Superoxide dismutasc activity was found in all organs of mouse investigated, and maximal activity of enzyme was observed in liver. most of superoxide dismutase activity, 79-86%, was present in the cytosolic fraction, and the rest was associated with mitochondria. The activity of cytosolic superoxide dismutase was most prominent in the liver among those tissues assayed. However, that of mitochoadrial enzyme was highest in the heart. Thc specific activity of superoxide dismutase in mitochondria was found about 2-5 folds greater than that of the enzyme in cytosol and cyanide inhibit the activity of cytosolic enzyme but not mitochondrial enzyme, In irradiatcd mice, the enzyme activity and the specific activity of superoxide dismutase in cytosol and mitochondna of various organs were decreased with minimal value on 7th and l4th day after exposured by whole body-irradiation.