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.

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.

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.

복합적층원통셸의 좌굴거동

원종진,이종선,홍석주 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2

The objective of this study is to investigate effects of prebuckling on the buckling of laminated compostie cylindrical shells. Both axial compression and lateral pressure are considered for laminated composite cylindrical shells with length to radius ratios. The shell walls are made of a laminate with several symmetric ply orientations. The study was made using finite difference energy method, utilizing the nonlinear bifurcation branch with nonlinear prebuckling displacements. The results are compared to the buckling loads determined when membrane prebuckling displacements are considered.

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.

R형 보강재로 보강된 복합적층 원통형패널의 최소중량화설계

원종진,이종선,홍석주 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

This study is simulation about buckling behavior under axial compression which is cylindrical panel laminated USN125 and USN 150 made by various winding angle.And also this study compare with linear and nonlinear FDEM theory, and FEM theory.To solve the objective function and the design variables, this study use the linear and nonlinear buckling theories of FDEM and nonlinear search optimum design method of ADS for minimum weight design on which stiffened laminated composite cylindrical panel with stiffener that R-type section.

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.

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.

연속주조 몰드의 구조해석

원종진,이종선,홍석주 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4

The objective of this study is structural analysis 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. Structural analysis was made using thermal analysis result, utilizing transient analysis of ANSYS. This structural analysis results, many variables such as casting speed, cooling condition, film coefficient, convection and load condition are considered.