One-Bottle 상아질 결합제의 유치 상아질에 대한 전단 결합 강도에 관한 연구

김종빈,김종수 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.3

치아 교환시기에 발거된 치관이 건전한 유구치 상아질 표면을 One-Bottle 상아질 결합체인 Primer & Bond NT(De Trey/Dentsply, Konstanz, Germany)와 Single Bond(3M Co. U.S.A.) 그리고 대조군으로 Scotchbond Multipurpose System(3M Co. U.S.A.)를 이용하여 각 제조자의 지침에 따라 처리하여 레진을 충전하고 광중합하였다. 1.전단 결합 강도의 측정결과 Primer & Bond NT군인 1군, Single Bond군인 2군, 그리고 대조군으로 사용된 Scotchbond Multipurpose System군인 3군의 순서로 1군에서 다소 높은 전단 결합 강도를 보였으나, 모든 군들간에는 통계적 유의차가 없었다(p〉.05). 2.주사 전자 현미경 소견에서 1군 2군에서 서로 유사한 양상의 잘 형성된 혼화층이 관찰되었으며, 레진 테그와 측방 가지 또한 다수 관찰되었다. 반면 3군에서는 혼화층이나 측방 가지의 형성이 1,2군에 비해 다소 미약한 양상을 보였다. 주요단어 : One-Bottle 상아질 결합체, 유구치 상아질, 전단 결합 강도, 주사 전자 현미경 To test the shear bond strength of a new "one-bottle adhesive" system to primary dentin two commercially available one-bottle adhesives(Prime & Bond NT, Single bond) and conventional three step system(Scotchbond Multi-Purpose Plus) were included for comparison. And We observe the interfacial morphology by scanning electron microscope. 90 primary molar teeth were embedded in acrylic and buccal and lingual surface were polished to 320 grit to create standardized dentin surface for testing. After bonding of composite resin to sample surfaces according to the manufacturer's direction and 1000 times thermocycling in dwell time 30 second, Shear bond strengths of adhesives to dentin were determined using universal testing machine and analyzed by ANOVA test. Another groups of specimens were treated by hydrochloric acid to secure the resin only and those tags were evaluated under SEM fur their length and forms and the morphology of the bonding sites were also observed The result are as follows 1 Group I(Prime & Bond NT) showed higher shear bond strength than groupⅡ(Single Bond) and Ⅲ(Scotchbond Multi Purpose Plus) but no statistically significant difference was founded between groups(p〉0.05). 2. Relating long resin tags of 70-120㎛ were observed in samples of all groups under SEM. We could observed hybrid layer, resin tag and many lateral branches in every group. But, we observed in groupⅢ rare lateral branched than other two group and discontinuous hybrid layer.

평상시와 생리기간 중 혈중지질의 비교연구

김영빈,문종숙 圓光大學校 附設 體力科學硏究所 2002 體力科學硏究 Vol.25 No.2

The study analysized their constituent parts of the blood lipids with 7 students from the department of dance and 7 students from that of general education of J High School of arts. After stastical analysis, there wac a significant difference between two groups both T-C and TG(p< .05), HDL-C showed difference at significant level(p< .001).

감초 내 글라브리딘의 Semi-pilot 규모 초임계유체 추출

임교빈,유종훈 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-

The purpose of this work was to study the feasibility of a semi-pilot scale supercritical CO₂(SCCO₂) extraction of glabridin from liquorice. The extraction experiments were carried out at temperatures ranging from 40 to 60℃ and at pressures ranging from 100 to 300 bar. The effects of process variables such as the type and amount of cosolvents, temperature, and pressure on the extraction yield, chemical composition of the extract, and extraction kinetics were investigated in detail. The chemical compositions of the extract were analyzed by high-performance liquid chromatography. Almost no glabridin was extracted at all extraction conditions when only pure supercritical carbon dioxide was employed as an extraction solvent, whereas a significant amount of glabridin was extracted in the presence of cosolvents such as acetone and ethanol. The experimental results obtained in this study revealed that the extraction yield not only increases but the extraction time also decreases as the concentration of cosolvents in SCCO₂ increases up to about 25%. Ethanol was found to be more effective in SCCO₂extraction of glabridin than acetone.

재해사례분석을 통한 빌딩공사 재해 특성

이종빈,노민래,고성석 한국안전학회 2004 한국안전학회지 Vol.19 No.3

Recently, construction work's tendency has become a high-rise building, a complexity and a large size. According to the KOSHA data, construction work accidents have not been decreased. Looking at from the side of accident, accidents of construction industry are occupied over 1/3 among all industry accidents. Therefore, this study will analyze the accident of the building construction work from the data of KOSHA which were collected during 11 years(1992 -2002) data relating to serious accidents of the building construction work, suggest the counterplan according to the each work type in building construction work.

초임계유체 공정을 이용한 L-ascorbic acid 함유 PMMA 미세입자 제조

임교빈,유종훈 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-

Although the study of L-ascorbic acid stability is a hot issue, few papers have been published. The L-ascorbic acid is spontaneously oxidized in the presence of oxygen. Thus, we attempted to prevent L-ascorbic acid from being oxidized. In this study, a supercritical fluid process was employed to prepare poly(methyl methacrylate) (PMMA) microparticles containing L-ascorbic acid. To overcome the unstability of L-ascorbic acid, a biocompatible PMMA was used as a protector. The supercritical fluid techniques have a merit that the particle site can easily be controlled. The experiments were carried out at temperatures ranging from 35 to 45℃ and at pressures from 100 to 115 bar using supercritical carbon dioxide. As a preliminary study, we prepared PMMA microparticles containing L-ascorbic acid for various operating conditions. The loading efficiency of L-ascorbic acid in PMMA microparticles were analyzed by a diode array spectrophotometer.

競技種目別 運動選手들의 筋力에 관한 硏究

박철빈,송종국,박수연,박찬호 경희대학교 체육과학연구소 1996 體育學論文集 Vol.24 No.-

The purpose of this study was to estimate physique and muscular strength in collegiate athletes. On a sample of 70 athletes (basketball, baseball, soccer, and ice-hockey) anthropometric measurements (height, weight, bone width, circumference and skinfold thicknesses) were taken, For the measurements of muscular strength grip strength, back strength, arm flexion and leg extension strength were tested. The results of this study showed that basketball players were highest for height, weight, humorous and femur diameters, chest circumference, and calf circumference. Ice-hockey players were highest for upper arm and flexed upper arm circumferences. On the other hand ice-hockey players were lowest for height, soccer players for weight, baseball players for humerous and femur diameters, soccer players for chest circumference. For skinfold thickness baseball players (10.1mm) were highest for triceps, basketball players (14.5mm) for subscapular, ice-hockey players (13.3mm) for suprailiac and medial calf (9.0mm) skinfold thicknesses. While soccer players were lowest for triceps (8.7mm), subscapular (8.6mm), suprailiac (9.8mm) and medial calf (7.5mm) skinfold thicknesses. There were significant differences (P〈0.01) for height, weight, femur diameter, upper arm and flexed upper arm circumferences among athletes. Grip strength (left and right) was highest in baseball players (52.1kg, 50.8kg) but lowest for soccer players (42.3kg, 42.8kg). Baseball players were highest for back strength (162.0kg). On the other hand back strength was lowest in ice-hockey players (127.1kg). For arm flexion and leg extension strength (left, right) basketball players (42.0kg, 44.9kg) were highest for both strength tests. While soccer players were lowest for arm flexion strength and baseball players for leg extension strength. Ice-hockey players were highest for sit-up (59.2). Significant differences (P〈0.01) were found for grip, back, arm flexion and leg extension strength and sit-up among athletes.

흡연에 의한 급성 호산구성 폐렴 2예

박종빈,김학렬,주현준,유태양,신성남,신정현,송정섭,황기은,김소영,양세훈,정은택 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

최근 흡연을 시작한 젊은 성언에서 급성 호산구성 폐렴의 발생에 대한 증례가 보고되고 있다. 급성 호산구성 폐렴은 대개 발열을 동반하기 때문에 초기에는 감염성 폐렴으로 잘못 진단, 치료되는 경우가 많다. 아직 정확한 병태 생리 및 조직학적 소견은 밝혀져 있지 않지만 병력 청취 및 임상 양상, 방사선 소견의 관찰을 통해 급성 호산구성 폐렴을 의심하고, 진단을 위해 기관지 폐포 세척액 검사를 시행한다면 좀 더 쉽게 진단 내릴 수 있을 것이다. 본 저자들은 최근 처음 시작한 흡연에 의해 발생한 급성 호산구성 폐렴을 진단하고, 스테로이드를 투여하여 성공적으로 치료한 환자 2예를 경험하였기에 이를 문헌 고찰과 함께 보고하는 바이다. Acute eosinophilic pneumonia(AEP) is characterized by acute febrile respiratory illness associated with diffuse pulmonary infiltration and pulmonary eosinophilia. The specific etiology for acute eosinophilic pneumonia is elusive. By some investigators, cigarette smoking is suggested as a causative substance which can cause AEP. In recent, the authors experienced two cases of AEP following cigarette smoking. Both cases had characteristic features including age around 20 years, new onset smoking before occurance of AEP, diffuse infiltration on chest radiography, pulmonary eosinophilia based on bronchoalveolar lavage and acute improvement after steroid therapy. These clinical features are resemble with previous smoking induced AEP case reports. Base on these clinical features, cigarette smoking associated AEP could be diagnosed more easily.

초임계 이산화탄소를 이용한 웨이퍼 세정

임교빈,유종훈 수원대학교 산업기술연구소 2003 산업기술연구소논문집 Vol.18 No.-

Organic and aqueous solvents are largely used in cleaning processes for semiconductor manufacturing. In this study, we examined a non-plasma, environmentally benign stripping method using supercritical carbon dioxide (SCCO₂) to remove ion implanted photoresist and residues from a wafer surface at temperatures ranging from 80 to 200℃ and at pressures from 150 to 400 bar. Polar cosolvents were added to nonpolar SCCO₂ to improve the stripping efficiency of photoresist and residues. A suggested cleaning mechanism is swelling and plasticization of the polymer by SCCO₂ associated with degradation by the cosolvents, thereby lowering molecular weight and increasing solubility. The I-line photoresist whose chemical structures had been changed after ion implantation was not easily removed by using SCCO₂ containing single cosolvent. However, SCCO₂ containing multiple cosolvents showed a high stripping efficiency of carbonized photoresist (about 90%) under the operating conditions of 80~100℃ and 150~250 bar. The experimental results obtained in this study verified that the SCCO₂ cleaning method is a promising alternative to traditional photoresist wet-stripping techniques.

인공위성 본체 추진 모듈의 최적화

임종빈,박정선 한국 항공대학교 항공산업기술연구소 2001 航空宇宙産業技術硏究所 硏究誌 Vol.11 No.-

본 연구에서는 인공위성 추진모듈에 대하여 최적화를 수행하였다. 추진모듈의 최적화는 발사환경을 고려하여 제한조건과 하중 조건을 설정하였다. 또한, 보편적인 최적화 프로그램에서는 다루기 힘든 제한 조건을 고려하기 위한 방법을 모색하였다. 이 방법은 유한요소 해석 프로그램과 최적화 프로그램을 연결하여 최적화를 수행하는 것이다. 이 방법에 의하여 유전자 알고리즘을 이용한 추진모듈의 최적화를 수행하였고, 유용한 정보를 얻었다. 본 연구의 결과 인공위성 구조인 추진모듈의 최적화에서는 응력에 의한 조건보다는 고유진동수에 의한 제한조건이 최적화 수행에 큰 영향을 미침을 알 수 있었다. A portion of a satellite structure is considered to optimize. The optimization approach provides a way to handle constraints under severe space environments and to combine optimization programs with commercial analysis codes. Optimization techniques, GA(genetic algorithm), is used with commercial finite element analysis far the optimization of satellite structure. Constraints are several stresses for static analysis and natural frequency for dynamic analysis. From numerical optimization results, it is found that the GA may reach the optimum design. Natural frequency are more active constraints in the optimization procedures in this study.

초임계 이산화탄소를 이용한 감초 내의 글라브리딘 추출

임교빈,유종훈 수원대학교 산업기술연구소 2003 산업기술연구소논문집 Vol.18 No.-

The purpose of this work was to evaluate the feasibility of supercritical carbon dioxide (SCCO₂) extraction of glabridin from various active components in Glycyrrhiza glabra. The extraction experiments were carried out at temperatures ranging from 40 to 80℃ and at pressures from 150 to 420 bar. The effects of process variables such as the type and amount of cosolvents, temperature, and pressure on the extraction yield, chemical composition of the extract, and extraction kinetics were investigated in detail. The chemical compositions of the extract were analyzed by high-performance liquid chromatography. Almost no glabridin was extracted at all extraction conditions when only pure supercritical carbon dioxide was employed as an extraction solvent, whereas a significant amount or glabridin was extracted in the presence of cosolvents such as methanol and ethanol. The experimental results obtained in this study revealed that the extraction yield not only increases but the extraction time also decreases as the concentration of cosolvents in SCCO₂ increases up to about 25%. Methanol was round to be more effective in SCCO₂ extraction of glabridin, leading to 16% improvement in the extraction yield, compared with ethanol.