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Mineral Trioxide Aggregate(MTA)의 치근단 역충전효과에 대한 임상적 연구
홍찬의,홍한표,조용범 단국대학교 치의학연구소 1994 논문집 Vol.6 No.1
Although numerous materials have been recommended as root end filling material, so far no material has been found to satisfy all of the requirements of an ideal material. An experimental material, mineral trioxide aggregate(MTA), has been recently developed to seal off all pathways of communication between the root canal system and the external surface of the tooth. This material has been used to seal the root end cavities in extracted teeth and similar preparations in beagle dogs and shown very promising results. In this clinical study, 5 anterior teeth from three patients were used to clinically and radiographically evaluate the efficacy of MTA as a root end filling material on a short-term basis. After removing the apical 2 to 3 ㎜ of the roots, The root end cavities were prepared and filled with MTA. The results were as follows: 1. All the cases demonstrated excellent healing radiographically and absence of clinical signs and symptoms. 2. According to the results, it appeared that MTA had a good sealing ability and biocompatibility. 3. MTA showed very promising results as a root end filling material, but Long-term clinical retrospective studies of many cases are recommended to get the most valid evaluations.
고체상 추출법을 이용한 Phthalate Esters의 분석방법 연구
홍성희,한개희,이찬형,이순화 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1
The study was carried out to evaluate the new analytical method of phthalate esters(diethyphthalate, di-n-butylphthalate, butylbenzylphthalate, bis(2-ethylhexyl)phthalate), one of the endocrine disruptors, which were performed by GC/MS-SIM(seleted ion monitoring). The phthalate esters were extracted from water samples using solid-phase extraction on C_18 columns. It investigated that the extraction recovert rate of phthalate esters with different solvents and solvent volume. The optimal solvent was dichloromethane and proper volume of dichloromethane for recovert of phthalate esters was 4 mL. There were good linearities(above R^2=0.9975) in the range 0.01∼0.50㎎/L,and the detection limits were below 0.01∼0.03㎍/L.The recovert rates,RSD and MDLs for phthalate esters were 80∼114%,5.0∼8.1% and 0.03∼0.11㎍/L,respectively. This method shows a good precision of phthalate esters.
洪璨基 관동대학교 1996 關大論文集 Vol.24 No.1
The components of application program which we usually use today can be divided into two parts; data structure and algorithm. However, when application programs are separated into unit programs, each of the unit programs which has some similar functions are classified into several groups. Application programs can also be divided into two parts based on its function; one is the interface part and the other is the part to implement the function practically. In this thesis, a problem domain is limited to the interface part to an application program. The components in this domain are generated by the system developer. These components are defined as unit programs for constructing menu-driven user interface. Reuse technology is a method to support the existing component to user when it is needed. In this technology, the key point to be considered is to support the retrieval of reuse components. For this, the ideal scheme of classification should be established. Direct manipulational the concept of reuse are used to make the graphical user interface which manipulates the interface parts. For reuse, the components developed in C++ using object-oriented approach are separated into tow parts; primitive components and user-defined components. Using these two concepts, we have increased the reliability and improvement of productivity of software, which is the goal of software engineering.
10MgO-10Fe_2O_3-30Na_2O-5OSiO_2 유리의 Mo¨ssbauer 효과 연구
홍치유,박관호,백승도,문찬호,조수열 동국대학교 1987 論文集 Vol.26 No.-
The Mo¨ssbauer effect studies of the quenched glass and heat-treated glasses were performed. The Debye and Einstien temperatures of the quenched glass, determined using the center shift and kinetic temperature, are 540K and 430K respectively. The X-ray diffraction pattern showed that the heat-treated glasses were crystallized. Form the isomer shift of the heat-treated glasses, it was concluded that the Fe^(3+) ion is predominantly octahedrally coordinated.
동화책 캐릭터에 있어서 어린이의 감성요인과 색채선호도 추출에 관한 연구
홍찬석,김현민 한국기초조형학회 2003 기초조형학연구 Vol.4 No.1
동화책은 어린이의 성장과정에 있어 사물의 형태에 새로운 개념과 현실 세계의 지식과 경험을 쌓는 중요한 매개체의 역할을 한다. 본 연구에서는 어린이들은 동화책을 어떠한 감성으로 이해하고 있는가를 연구하였다. 연구방법은 동화책의.구성요소를 알아보기 위하여 수량화3류 (Quantificatlon theory type 3)를 사용하였다. 분석은 6개의 아이템과 16개의 카테고리를 만들어 사용하였으며 인자분석 (Factor Analysis)은 어린이의 감성을 평가하기 위하여 19개의 형용사를 사용하였다. 어린이의 컬러 실험은 인자분석의 결과에 의해서 실시 되었으며. 실험방법은 어린이들이 좋아하는 색, 직접 그린 그림, 동화책 캐릭터의 색을 비교하였다. 논문의 결론은 첫번째, 동화책의 분류를 통하여 공통된 요소, 동화책의 경향을 알수 있었다 두번째, 동화책 캐릭터에 대한 어린이의 감성이 평가되었다. 세번째, 동화책 캐릭터와 칼라가 어린이에게 미치는 영향을 알 수 있었다. An assimilation book acts role of important intermediate that accumulate new concept and actuality world knowledge and experience in form of things in child's growth process. Children studied if understand an assimilation book by some sensitivity in this research. Method of study used Quantification theory type 3 quantity Tuesday to recognize component of an assimilation book. Analysis used making 16 Category with 6 Item and Factor Analysis used 19 adjectives to evaluate child's sensitivity. Experiment method compared color, direction picture that paint, color of assimilation book character that children like. Child's a color experiment carried out by result of factor analysis. Conclusion of treatise is first, could know common element, tendency of an assimilation book through classification of an assimilation book. Second, child's sensitivity about assimilation book character was evaluated. Third, could know effect that assimilation book character and collar get to child.
(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b,d] pyran-9(8H)-one의 염소화 반응에 관한 연구
홍기운,육찬남,백승화 圓光大學校 1991 論文集 Vol.25 No.2
(±)-6a, Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b,d] pyran-9[8H]-one의 염소화 반응은 metal halide와 함께 18-crown-6존재하에m-chloroperbenzoic acid에 의해 산화반응이 일어났다. 이 반응계에서는 염소화 반응이 방향족 고리에만 선택적으로 일어났다. (±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b, d]pyran-9(8H)-one has been chlorinated in the aromatic ring with metal halide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. This reagent system effects the regiospecific chlorination of activated aromatic ring over olefinic double bond.