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최기열 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3
The degree of polymerization of dental polymers has much influences on the physical and mechanical properties, such as hardness, tensile strength, compressive strength abrasion resistance, disintegrity and discoloration. Five kinds of composite resins and five kinds of pit and fissure sealants were used in this study. The size of KBr pellets was 13 mm in diameter and 0.05 mm in thickness and the degree of polymerization was measured with IR spectrophotomer(Hitachi 270-30, Japan). The obtained results were as follows : 1. The degree of polymerization of composite resins was 53∼72%, and that of pit and fissure sealants was 66∼73%. 2. The degree of polymerization varied to the shade of composite resins and the more translucent comosites showed much higher value relatively. 3. The fluoride containing pit and fissure sealants were polymerized much less than not containing sealants.
지적정보를 이용한 3차원 공간정보 활용시스템 구축 방안
최기열,김감래 한국국토정보공사 2009 지적과 국토정보 Vol.39 No.1
최근 급격한 정보기술과 GIS 기술의 발전은 공공부문과 민간부문에서 보유한 도형과 속성자료를 이용해 다양한 공간정보 기반의 활용 시스템 구축을 추진하고 있다. 중앙과 지방정부에서 공간정보 활용 또는 참조가 요구되는 업무를 조사한 결과에 따르면 50%에 달하며, 해정업무의 신속한 의사결정이 국민의 재산권과 삶의 질에 미치는 영향을 고려하면 보다 정확하고 유용한 공간정보 활용이 요구된다. NGIS 사업에서는 과학적 공공업무 수행에 활용될 정보 중 3차원공간정보를 활용하여 시스템을 구축하고 있으나 현재의 3차원 정보는 한정된 분야에서만 이용되고 있는 실정이다. 따라서 본 연구에서는 국가에서 활발히 추진하고 있는 3차원공간정보 DB구축 사업에 맞추어 지적정보를 기반으로 3차원 데이터를 연계하여 공공부문과 민간 부문에서 다양하게 활용할 수 있는 시스템구축 방안을 제시하고자 한다. Recently IT and GIS technology have rapidly developed, and these promote to construct various space information based task application systems using the data of figure and attribute that public and private sector possess. As the result of investigation, 50% of central and district government required application and reference of space information. As considered the influence that administrative decision making of government and public offices has on people's property right and quality of life, it is necessary to plan and construct more accurate and useful space information application system. The 3rd NGIS project constructs application system based on 3D space data from among information which will be applied to scientific public work, but now 3D information is just used in limited field. This study suggested the plan which can provide information actually required for government and public offices or private sector in time with keeping pace with the direction of 3D DB construction promoted by government.
최기열,김철위 대한구강생물학회 1986 International Journal of Oral Biology Vol.10 No.2
The purpose of this study was to evaluate the staining property of dental composite resins in various solutions. Eleven kinds of dental composite resins were used in this study, five of them were chemically cured composite resins and the others were visible light cured composite resins. Specimens (diameter 20㎜, thickness 1.3㎜) were immersed in 2% of coffee solution, cola, distilled water, orange juice, soy sauce solution and tea solution for 1.2.3 and 4 weeks. The value of Hunter's color difference E)was measured by Spectrophotometer(MS-2000, Macbeth, U.S.A) with integrating sphere. From the experiment following results were obtained : 1. Staining tendencies of composite resins were higher in coffee, tea and soy sauce solution. 2. Composite resins were stained much after one week and thereafter the degree of staining was not much increased as in the first week. 3. Chemically cured composites showed higher tenency of staining than visible light cured composites. 4. Blended composites showed the highest value of staining, followed in order by convetional and microfilled composites. 5. Posterior composites showed higher value of staining than anterior and anterior/posterior composites and this was significant.