백서에 있어서 incision 중지가 하악두 연골의 성장 및 미세구조에 미치는 영향

성재현,배용철,박매자,주강,경희문 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.3

The purpose of this study is to investigate the effect of loss of incisal function on the thickness, growth activities, ultrastructure of the condylar cartilage and on the muscle fibers of masseter superficialis, anterior belly of digastric muscle in the growing rats. 37 day-old-rats of which incisors had been trimmed every day received soft diet from weaning and were studied by the autoradiography, electron microscopy and muscle histochemistry. The results obtained were as follows ; The thickness of the fibrous, proliferative layer in superior, posterosuperior portion of the condylar cartilage was significantly(p<0.01) reduced in experimental groups and the decrease rate of fibrous layer thickness was greater in posterosuperior portion than in superior portion of cartilge and was greater than in proliferative layer. In normal group, more cells of posterosuperior portion moved more rapidly towards the medullary cavity. In experimental group, the labelling index of posterosuperior portion was decreased in proliferative layer at 2 hours, in transitional layer at 1, 2 days, in hypertrophic layer at 4 days after injection relative to posterosuperior portion of control group. But labelling index of superior portion was not different form that of control group at all time course after injection. From the muscle histochemistry, the diameter of type IIB fibers in masseter superficialis muscle, type ⅡA, type IIB fibers in anterior belly of digastric muscle decreased significantly(p<0.01) relative to controls in experimental group. From electron microscopic study, in the fibrous layer of the posterosuperior portion of condylar cartilage in normal group, many fibroblast like cells near the joint cavity showed extensive remodelling activities in ultrastructure. There was no morphological changes between experimental and control group in all cartilage cell layers of superior portion but cells near the joint cavity in fibrous layer of posterosuperior portion of experimental group showed morphologically inactive state relative to control group.

삼상 순환 유동층 생물반응기에서 열전달 계수

강태규,송평섭,최길수,조용준,강용,최호석,김상돈 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.5

직경이 0.102m이고 높이가 1.0m인 기체-액체 순환 및 삼상 순환유동층 생물반응기의 상승관에서 열전달 특성을 고찰하였다. 기체 및 액체의 유속 그리고 생물막 담체의 체류량이 상승관 내부의 수직 열원과 반응기 사이의 열전달 계수에 미치는 영향을 결정하였다. 기체-액체 순환 반응기에서 열전달 계수는 기체의 유속이 증가함에 따라 증가하였으나 액체 유속의 증가에 따라서는 약간 증가하였다. 삼상 순환유동층 생물반응기에서 열전달 계수는 기체의 유속과 유동 생물막 매체의 체류량이 증가함에 따라 증가하였으나 액체의 유속이 증가함에 따라서는 약간 증가하였다. 본 연구의 실험 범위에서 이들 열전달 계수는 실험 조작 변수의 상관식으로 잘 나타낼 수 있었다. Heat transfer characteristics have been investigated in the riser of gas-liquid circulation and three-phase circulating fluidized-bed bioreactors whose diameter and height are 0.102m and 1.0m, respectively. Effects of gas and liquid velocities and holdup of fluidized biofilm media on the heat transfer coefficient between the immersed vertical heater and the bed have been determined. The heat transfer coefficient in the gas-liquid circulation reactor increases with increasing gas velocity, but increases only slightly with increasing liquid velocity. The h(heat transfer coefficient) value in the three-phase circulating fluidized-bed bioreactor also increases with increasing gas velocity or holdup of fluidized biofilm media, but it increases only slightly with liquid velocity. The value of heat transfer coefficient has been well correlated in terms of operating variables.

단순 스무딩 스플라인 함수 추정

강상길,이우동,윤용화,김종태 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1

본 논문의 목적은 선형 스무딩 스플라인에 대한 단순하고 구체화된 형태를 제안하고, 구체화된 선형 스무딩 스플라인 형태를 통하여 스무딩 스플라인의 특성을 이해하고는 어떻게 비모수 함수 추정량의 도구로서 사용될 수 있는지를 보인다. 또한 예제를 통하여 다른 비모수적 추정량들과 비교하였다. In this paper, we give simple and closed form of linear smoothing spline. Through the form, we understand the characteristics of smoothing spline, and show that how the smoothing spline can be used as a tool for estimator of nonparametric functin. And an example is given for comparison of our esttimator with another nonparametric estimators.

반복적 임금협상게임에서 최저임금제의 효과

강성호,김용관 한국경제학회 2006 經濟學硏究 Vol.54 No.1

오존공정을 이용한 염색폐수의 처리특성에 관한 연구

강용태,원태준,한상윤,고영발,박경덕 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.32 No.1

The wastewater from textile industry typically containing high alkalify, salts, organic matter, and high color. Textile wastewater is usually treated by anaerobic-aerobic activated-sludge process. The activated-sludge process is effective the reduction of organic matter, but generally does not remove color. Ozone process is one of the most effective process in removal of color for the textile wastewater. Ozone has a strong oxidized dissolution of organism, deceleration, deodorization, fumigation, etc., regarding to water. This study focused on the color removal of textile wastewater. In this study, textile wastewater was treated strongly with ozone at 650mg/hr and the flow rate through ozone contact tank was adjusted to 5L/min. In an application Ozone treatment, Color was generally decreased with time, however, COD removal effect was not that good. In this study, the removal efficiencies of CODcr and Color were 23.5%, 80.4% respectively.

분만혈액을 이용한 HLA Class I 검사용 tray의 제작을 위한 연구

권소영,강성은,박경신,황유성,김상인 大韓輸血學會 1999 大韓輸血學會誌 Vol.10 No.1

인체 체액내 황색포도상구균의 증식과 철 획득 기전

신성희,이강길,이명희,양남웅,임용,김진호 대한감염학회 2000 감염 Vol.32 No.5

비피더스균(Bifidobacterium)의 배양과 이용

姜國熙,朴勇河,金尙希 成均館大學校 1983 論文集 Vol.33 No.-

The fact became generally to know that Bifidobacterium were beneficial to human health. One gram of solid faeces(wet weight) was homogenized for not longer than 2 min. in 9ml of anaerobic dilution in glass homogenizer to give a homogeneous suspension and 10-fold dilutions in anaerobic dilutions were made from this suspension. BS, BL, and EG agar medium were used for isolation of Bifidobacterium. 10 Strains of Bifidobacterium were isolated from human faeces. They were identified and examined in physiological character. Concentration of Bifidobacterium was 3.0×10 exp 9/g in the faeces of healthy adults of Korean(19 adults aged 20∼25 years). Concentrations of Bifidobacterium in the faeces of one man were changed in each days.

Mica에 대한 이산화티탄의 흡착에 관한 연구

강익균,한상현,김용권 慶熙大學校 1984 論文集 Vol.13 No.-

Titanium oxide was prepared by the hydrolysis of TiCl_4 and was coated on mica. The optical characteristics such as reflection and transmission of the latter was studied. The effects of concentrations of TiCl_4 on the rate of hydrolysis, particle size of hydrolysis product (Ti0_2), and crystal induction time, were found to be quite reverse to the general principle. Graphical analysises show that the crystal induction time was shorter as the concentra-tion of TiCl_4 decreased. By proper regulation of the condition of hydrolysis of TiCl_4 solution, mica pigments of colours ranging from silver-white to red was produced. Their maximum intensity of light reflection and maximum transmittance were from 300 to 800nm and from 400 to 700nm respectively.

Biosurfactant 생산 효모 Rhodotorula sp. G-1의 분리 및 Biosurfactant 생산

강상모,이철수,김영찬 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2

미생물 기원의 계면활성제(microbial-surfactant, biosurfactant)를 생산하는 균주를 찾기위해 여러 지역의 토양에서 생산균주를 분리, 동정하였고 이 균주의 발효생산 최적 조건을 검토하였다. 서울과 근교의 주유소 주변 토양에서 20여 균주를 분리하였으며 이들 중 배양액의 표면장력을 가장 많이 저하시켜 다른 균주에 비하여 상대적으로 활성이 좋은 G-1 균주를 분리하였다. 이 균주의 형태학적 및 배양학적인 특성에 의해 동정한 결과 아직까지 biosurfactant 생산균이라고 알려진 바가 없는 새로운 효모인 Rhodotorula sp. G-1로 동정되었다. 이 균주의 최적 biosurfactant 생산 조건은 탄소원인 soybean oil 4%, glucose 2%, yeast extract 0.5%, 인산염농도 0.1%, pH 6.0, 30℃에서 3일간 진탕배양했을 때 surface tension 활성이 가장 높았다. 그리고 처음에는 탄소원으로 soybean oil만을 첨가하여 배양하다가 glucose를 90시간만에 공급한 경우 처음부터 soybean oil과 glucose를 동시 첨가한 것에 비하여 surface tension 활성이 14% 증가함을 알 수 있었다. 이렇게 하여 biosurfactant 양은 15.0 g/l 농도로 얻을 수 있었다. Some microorganisms including yeasts produce surface tension-decreasing biosurfactants. The strain G-1, the best producer of biosurfactant, was isolated from the soil and identified as Rhodotorula sp., which was not discribed any report. The Rhodotorula sp. G-1 produced biosurfactant from vegetable oils, but failed to produce it from n-alkane or carbohydrate. Yeast extract was found to be more effective for the biosurfactant production as nitrogen source than any other inorganic nitrogen source. The composion of the optimal medium contained the following conponents: soybean oil 4%, glucose 2%, yeast extract 0.5%, KH_2PO_4 0.1%, K_2HPO_4 0.1%, MgSO_4 5%, CaCl_2 0.01% NaCl 0.01%, pH 6.o. The surface tension activity was increased to 14% when, at first, the culture broth was fermented with only soybean oil as carbon sourse, and after 90 hours, feeded glucose, than that of glucose and soybean oil added to it simultaneously. The maxium yield of the biosurfactant was about 15 g/l by, after 90 hours, the feeding method of glucose.