보강된 복합적층 원통형패널의 좌굴거동

이종선,원종진,홍석주,윤희중 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.5

Bucking behavior of stiffened laminated composite cylindrical panel was studied using linear and nonlinear deformation theory. Various buckling load factors are obtained for stiffened laminated composite cylindrical panels with rectangular type longitudinal stiffeners and various longitudinal length to radius ratio, made from Carbon/Epoxy USN150 prepreg and are simply-supported on four edges under uniaxial compression. Buckling behavior design analyses are carried out by the nonlinear search optimizer, ADS.

구멍이 있는 공작물의 가공시 형상특성

이종선,원종진,안운상,홍석주,윤희중 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.5

This study is to investigate the characteristics of the surface around a hole and outlet of product which are manufactured by face mill or end mill cutting with a hole or a pocket in its surface. Furthermore, experiments for optimization of process conditions to minimize the change of characteristics of milling cut surface after a hole cutting operation are implemented. This result is apply manufacture of mold products and metal products by diecasting.

建築物의 窓·戶 特性에 관한 調査 硏究(Ⅰ) : 寺刹建築物 窓·戶 文樣 體系를 中心으로(1) Focused on the patterns of Windows and Doors of Temple Architecture(1)

이청웅,정원석,하주아 조선대학교 국토개발연구소 1995 국토개발연구 Vol.15 No.2

This study refers to the materials of existing papers published, arranges them, examines systematically the characteristics of windows and doors of temples in Korean traditional architectures, collects the materials required through literatures, existing plans and field survey, makes the figures obtained based on the materials into the tables and then compares and reviews the results. All kinds of historical divisions of architectural buildings which were accepted as the subjects of this study are only for reference. This study treats the comprehensive things from very primitive private houses to palace architecture and temple architecture from the view point of traditionality, examines their correlations and deals with centrally the temple architectures. Furthermore, the bibliographies which treat the division of external patterns and names of windows and doors and the basic materials of the artistic aspects deeply are very insuffient and further researches about these shall be carried out. So this study is to reveal the characteristics of windows and doors of Korean traditional architecture from the artistic point of view, to pursue its value and the right understanding of our traditional construction.

퍼망간네이트-옥살산에 의한 아크릴아마이드 수용성중합에서의 첨가제 효과

이채주,이종광 慶尙大學校 1986 論文集 Vol.25 No.2

The polymerization of Acrylamide initiated by MnO4-H2C2O4 redox pair has been studied in aqueous media at 35±0.2℃ in nitrogen armosphere. The rate of polymerization is independent of activator concentration (2×10-3 to 4.5×10-3 mole/1) expect at very high (above 6.3×10-3 mole/1) concentration. The initial rate of polymerization has been found to be proportional to nearly 1.17 power of low catalyst concentration (2.3×10-4 to 6.25×10-4 mole/1) and nearly the first power of low monomer concentration (1.47×10-3 to 3.3×10-3 mole/1). The overall energy of activation has been found to be 10.99kcal/mole within the temperature range 30-50℃. The effects of various additives have been studied. Organic solvents and salts depress the initial rate but small amounts of manganous salts(MnSO4, MnCl2) increase the initial rate to a considerable extent. A complexing agent(NaF) and anionic and cationic surfactants show marked influence on the rate of polymerization. The intrinsic viscosity in aqueous acrylamide solution at 30±0.1℃ was 1.01 and the molecular weight of the polyacrylamide was 63,900.

탄산음료 유발 법랑질 침식에 대한 항우식 제품의 예방 효과

송주현,김영재,김정욱,장기택,김종철,한세현,이상훈 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

본 연구는 항우식 제품인 Casein phosphopeptide-amorphous calcium phosphate(CPP-ACP)를 포함하는 치아크림, 불소 바니쉬, 저농도 불소 양치액을 치아에 도포하는 것이 단시간 탄산음료에 의한 법랑질의 침식을 예방할 수 있는지 살펴보기 위해 계획되었다. 법랑질 시편에 다음과 같은 항우식 제품을 도포하였고, 인공타액에 24시간 보관한 후, 콜라에 1분 증류수에 1분씩 5회 번갈아 처리하였다. 1군: 대조군(무처치) 2군: CPP-ACP 치아크림군 3군: 불소 바니쉬군(1,000 ppm F) 4군: 저농도 불소 양치액군(227 ppm F) 5군: 불소 바니쉬 + CPP-ACP 치아크림군 6군: 저농도 불소 양치액 + CPP-ACP 치아크림군 미세경도와 침식깊이를 측정하였고, Quantitative light-induced fluorescence(QLF)를 이용하여 안정된 형광 격자에 대한 부피 형광 변화인 ΔQ를 측정하여 무기질 감소량을 평가하였다. 6일 동안 실험을 반복하여 다음과 같은 결과를 얻었다. 1. 미세경도는 1군≤2군≤4군<6군<3군≒5군 순이었다. 2. 평균 침식깊이는 5군≒3군<6군<4군≒2군≒1군 순이었다. 3. ΔQ는 1군≒2군≤4군≤6군≤3군≒5군 순이었다. ΔQ의 감소율은 1군과 2군, 4군과 6군, 3군과 5군이 각각 유사하였다. 4. ΔQ는 미세경도와 강한 양의 상관관계를 나타냈고(r=0.96, p<0.05), 침식깊이와는 강한 음의 상관관계를 보였다(r=-0.96, p<0.05). The aim of this study was to evaluate the preventive effect of commercially available anticariogenic products, specifically, the tooth cream containing Casein phosphopeptide-amorphous calcium phosphate(CPP-ACP), fluoride varnish and low-level fluoride mouthrinse on enamel erosion induced by carbonated beverage in a short period of time. Enamel specimens were treated as follows and were then kept in artificial saliva for 24 hours followed by further processing by alternately soaking them in Cola beverage and in distilled water for 1 minute each five times. Group 1: control group (no treatment) Group 2: tooth cream with CPP-ACP Group 3: fluoride varnish (1,000 ppm F) Group 4: low-level fluoride mouthrinse (227 ppm F) Group 5: fluoride varnish + tooth cream with CPP-ACP Group 6: low-level fluoride mouthrinse + tooth cream with CPP-ACP Microhardness and erosion depth were measured and the mineral loss of each specimen was evaluated by measuring the volumetric fluorescence change(ΔQ) against the stable fluorescent grid using quantitative lightinduced fluorescence(QLF). The experiment lasted for 6 days repeated each day. The results were as follows: 1. The microhardness was increased as follows: Group 1≤2≤4<6<3≒5. 2. The mean erosion depth was increased as follows: Group 5≒3<6<4≒2≒1. 3. The ΔQ was increased as follows: Group 1≒2≤4≤6≤3≒5. The decrement of ΔQ was similar between group 1 and 2, group 4 and 6 and group 3 and 5. 4. The ΔQ showed positive correlation with microhardness (r=0.96, p<0.05), while it was negatively correlated to erosion depth (r=-0.96, p<0.05).

치수절단술에 사용되는 약제가 백서 치배 및 치배주위조직세포에 미치는 영향에 관한 ^3H-thymidine을 이용한 자기방사법적인 연구

박경주,이종헌,임창윤 단국대학교 치의학연구소 1992 논문집 Vol.4 No.-

Formocresol(FC) had been widely used as medicament for pulpotomy, but because FC have strong toxicity, carcinogenic potential, and strong diffusible properties in tissues, Glutaraldehyde, another medicament for pulpotomy was greatly presented by many investigators and practitioners. Although many investigators had studied difference of two medicament's effects on periodontal tissues and tooth germ, there were no manuscripts of cellular activity about these medicaments applied to teeth, but there were almost clinical, histopathological studies. Especially in the investigative effects on tooth germ, the results were controversal. Thus to investigate about effects on cellular actiity of perigerminal tissue and tooth germ of rat, author presented the cellular activity and the pathologic change through calculating Thymidine labelling index(TLI) from autoradiographic technique using 3H-thymidine after these medicaments were applied to tooth. The obtained results were as follows. 1. Inflammation was initiated after one week of FC and two weeks of GA. It was thought that diffusible property of GA was lesser than that of FC. 2. In group treated with FC, inflammation, vasodilation and bone destruction continuously increased for all periods of experiment and the feature of 8 weeks was very severe. But in group treated with GA, inflammation, vasodilation and bone destruction slightly incresed for all period of experment. 3. TLI was increased after two weeks of FC, but decreased after four weeks because of different accumulative concentration between 2 and 4 weeks. 4. GA treated group which did not show the change of the cellular activity of perigerminal tissue and tooth germ presented the slight effects on these cells. 5. Changes of cellular activities in FC treated group did not result from inflammation, but formocresole's property itself. And bone destruction was derived from secondary effects of inflammation. 6. The fact that FC arose severe inflammation and change of cellular activity reflected that FC might affected

QLF를 이용한 항우식 제품의 인공우식 재광화 효과에 대한 연구

송주현,김영재,김정욱,장기택,김종철,한세현,이상훈 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

본 연구는 항우식 제품인 저농도의 불소 양치액(500 ppm NaF)과 Casein phosphopeptide-amorphous calcium phosphate(CPP-ACP)를 포함하는 치아 연고,그리고 이 두 제품을 같이 사용했을 경우,인공 우식 병소의 재광화 효과를 알아보고자 하였다. 제3대구치 협면에 인공우식을 유발하였고,시편을 16개씩 4군으로 나누어,28일 동안 매일 2회 다음과 같은 항우식 제품을 시편에 처리하였고,pH 순환 시스템을 적용하였다. 1군: 대조군(무처치) 2군: Tooth Mousse^(ⓡ) (GC Co. Japan) 3군: 치카치카^(ⓡ)(삼일제약. 한국) 4군: 치카치카^(ⓡ)+ Tooth Mousse^(ⓡ) 무기질 소실량(ΔQ)의 장기적인 변화를 Quantitative light-induced fluorescence (QLF)를 이용하여 관찰하여 다음과 같은결과를 얻었다. 1. ΔQ는 1군에서는 28일동안 유의성 있는 차이를 보이지 않았고,2군과 3군에서는 처치전에 비해 14일부터 유의성 있는 증가를 보였으며,4군에서는 7일부터 유의성 있는 증가를 보였다. 2. ΔQ는 1군 < 2군,3군 < 4군 순이었다. 3. ΔQ는 1군과 비교시 2군은 7일,3군과 4군은 3일부터 유의성 있는 증가를 보였고,2군은 3군과 전 기간 동안 유의차가 없었다. 4군은 2군과 3군에 비해 28일에 유의성 있는 증가를 보였다. 4. 모든 군에서 재광화 속도는 점차 감소하였다. The purpose of this in vitro study was to compare the remineralization effect of commercially available anticariogenic products, exactly low level fluoride mouthrinse(500 ppm NaF), tooth cream with Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and fluoride mouthhnse plus tooth cream on artificial caries lesion. Artificial caries lesion was induced at the buccal surface of permanent third molar and the specimens were then divided (16 specimens/group) into four group. Twice a day during 28 days specimens of each group were treated with a commercially anticari.ogen.ic product as follows and applied to the pH cycling system. Group 1: control group (No treatment) Group 2: Tooth Mousse^(ⓡ) (GC Co. Japan) Group 3: chikachika^(ⓡ) (Samil Co. Korea) Group 4: chikachika^(ⓡ) + Tooth Mousse^(ⓡ) The long-term change of mineral loss(ΔQ) was evaluated by quantitative 1ight-induced fluorescence(QLF) and the following results were obtained: 1. ΔQ of Group 1 was not noticed statistically significant during 28 days comparing that prior to treatment. There was a statistically significant increase in ΔQ of Group 2 and 3 since 14 days. So was in ΔQ of Group 4 since 7 days. 2. ΔQ was increased as follows: Group 1< Group 2, 3< Group 4. 3. Comparing with Group 1, Group 2 was a statistically significant increase since 7 days and Group 3 and 4 were since 3 days. Comparing Group 2 with 3, there was not noticed statistically significant during whole duration. Group 4 was significantly higher than Group 2 and 3 after 28 days. 4. All groups demonstrated a decrease in the rate of remineraUzation as time goes on.

Propylthiouracil에 의한 중증 급성간염 1예

임종주,심미령,이명수,김태현,오석규,안선호,박무림,김남호,박병현,조성구 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.2

PTU에 의한 간염의 발생은 매우 드물게 발생하는 것으로 알려져 있으나 저자들은 Graves씨 병으로 진단 받고 propylthiouracil 투여를 받고있던 환자에서 중증의 급성 간염이 발생한 1예를 경험하였기에 보고하는 바이다. Propylthiouracil is widely used to treat patients with hyperthyroidism. This drug has been associated with severe hepatotoxicity rarely. We presented the case of jaundice and profound liver dysfunction from a 23-year old woman treated with propylthiouracil for hyperthyroidism. Viral, metabolic, and autoimmune liver disease could be excluded and liver biopsy revealed a pattern of acute hepatitis. After discontinuing the drug, there was a progressive resolution of hepatic symptoms and decrease in biochemical data of the liver. Despite propylthiouracil induced hepatitis in rare case, patients receiving propylthiouracil are exposed to develope severe hepatotoxicity. Therefore it might be advisable to monitor level of the transaminase on regular base from patients receiving propylthiouracil.

한국인 연령에 따른 Actinobacillus actinomycetemcomitans의 발현빈도 및 항체 역가에 관한 연구

정종평,김강주,이상철,손성희 대한구강생물학회 1988 International Journal of Oral Biology Vol.12 No.2

In order to investigate on the frequency and antibody levels to Actinobacillus actinomycetemcomitans from Korean population, normal group were divided into 5 category by the related age : 3-6 years, 7-12 years, 13-20 years, 21-35 years and over 36 years, and also disease group were divided into the diagnostic condition : Localized juvenile periodontitis, post-localized juvenile periodontitis, rapidly progressive periodontitis, adult periodontitis. Each group was composed of 10 to 20 patients and plque sampling was also performed on the mesial pocket of mandibular lst molar with 3 paper points on anaerobic condition. Isolation and identification were done by using a selective medium(tryptic soy agar supplemented with 10% serum, 75ug of Bacitracin and 5ug of Vancomycin per ml) in 10% CO_2 incubator for 3 days with routine Gram staining, biochemical test and colony morphology. Serum antibody levels were also performed with isolated A. actinomycetemcomitans SNUDC 10-1 by using modified ELISA technique. The frequency of A. actinomycetemcomitans in normal healthy group was within 10% and no detection was revealed in 7 years group. Otherwise, the frequency of localized juvenile, rapidly progressive, adult perioduntitis and adult periodontitis associated with diabetes mellitus were 75%, 68%, 42%, and 25%, respectively. Serum IgG antibody levels to A.a SNUDC 10-1 in umbrical cord blood was similar to 3-6 years or 13-20 years group, and 3-6 months group were shown only trace amount of antibody levels. The antibody levels of 1 year and 7-12 years group were revealed 2/4-1/3 levels of 3-6 years group and this levels were gradually increased from 7-12 years group until over 36 years group. However, the antibody levels of localized juvenile, post-localized juvenile and rapidly progressive periodontitis were significantly higher than that of healthy group and no significant differences of the level were recognized between each disease group.

연속주조 몰드의 구조해석 비교

원종진,이종선,홍석주,이현곤 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

This study is object to structural analysis comparison of continuous casting mold. A two-dimensional finite element model was developed to compute the temperature distribution, thermal stress and thermal strain behavior for continuous casting mold. For structural analysis using thermal analysis result from ANSYS. In other to structural analysis of continuous casting mold, many variables such as casting speed, cooling condition, film coefficient, convection and load condition are considered.