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.

EU와 한국의 IT를 통한 에너지효율화 정책 비교 연구

이각범,박찬국,용태석 한국정보사회진흥원 2008 정보화정책 Vol.15 No.3

에너지 효율화를 이루기 위해 세계 각국은 IT 인프라를 적극 활용하고 있다. 특히, EU는 에너지와 IT의 융합 범위를 지속적으로 확대하고 있고, 참여와 협력을 기반으로 공동연구과제를 추진해오고 있다는 점에서 주목할 만하다. 반면, 우리나라의 경우 IT를 통한 에너지 효율화 연구주제는 전력분야에 국한되어 있으며, 에너지 융합 논의가 아직 초기 단계에 머물러 있다. 본 연구에서는 EU와 우리나라의 IT를 통한 에너지 효율화 정책을 연구주제 선정 과정 및 연구개발 범위와 추진방향, 에너지와 IT 두 부문의 유기적인 연계성, IT확산에 따른 리스크 대응 측면에서 비교 분석하고, 국내의 IT와 에너지 간 융합 전략을 설정함에 있어 시사점을 도출한다. 앞으로 IT를 통한 에너지효율화 정책은 에너지 정책과 정보화 정책 간 긴밀한 연계성을 갖추어가야 하며, 차세대 IT를 어떻게 에너지 효율화에 접목시킬 것인가에 대해 그 기술도입의 우선순위와 응용범위를 구체화시켜 나가야 한다. 또한, 에너지 부문에 정보화가 확산되면서 나타나는 부작용과 위험요소 등에 적극 대응하면서 에너지산업의 성장 동력화를 위한 인프라를 갖추어가야 한다. The world has been making active use of IT(information technology) infrastructure for the energy efficiency. Especially EU's energy informatization strategy is prominent in terms of i scope and systematicness, based on participation and collaboration. Korea, however, does research on energy-IT convergence focusing just on power grid and does not have a long history of research on energy-IT convergence. We carry out an in-depth study on comparing the energy efficiency policies of EU and Korea in terms of the R&D process, range, and direction. We try to draw implications in setting an strategy on the future convergence policy of energy and IT. The energy efficiency strategy and informatization strategy should be closely connected and policy makers should show concrete action plans to apply the next generation IT for energy efficiency. Furthermore the policy makers should pay attention to measures to cope with the risks stemming from energy informatization.

근관내 여러 조건에서의 ROOT ZX 전자근관장 측정기의 정확성에 관한 연구

조용범,홍한표,홍찬의 단국대학교 치의학연구소 1994 단국대치의학연구소논문집 Vol.6 No.1

Mineral Trioxide Aggregate(MTA)의 치근단 역충전효과에 대한 임상적 연구

홍찬의,홍한표,조용범 단국대학교 치의학연구소 1994 단국대치의학연구소논문집 Vol.6 No.1

義決權行使에 관한 諸問題

李範麟 梨花女子大學校 法政大學 1964 法政學報 Vol.7 No.-

근관내 여러 조건에서의 ROOT ZX 전자근관장 측정기의 정확성에 관한 연구

조용범,홍한표,홍찬의 단국대학교 치의학연구소 1994 논문집 Vol.6 No.1

The technique of electronic working length determination has gained considerable popularity among both endodontists and general dentist. Recently, the Root ZX(J.Morita Corp., Tokyo, Japan) has been developed with unique electronic features that are claimed to maintain the instrument's accuracy regardless of canal condition. The purpose of this study is to compare the accuracy of the Root ZX with estimates of actual canal length, in vitro model and in vivo under the various condition. 1. The experiment in vitro model 50 extracted, single-rooted and single-canaled, teeth with mature apices were selected. The extirpated teeth were placed in a saline-soaked Oasis, and measured with Root ZX according to manufacturer's instruction in the dried canal and saline-irrigated canal. The teeth were then removed from the model and the actual canal length was measured. The values of canal length in each conditions were used for evaluating the results. 2. In vivo study 15 teeth which destined for extraction were selected. Once access was gained, the canals were irrigated using 5.25% sodium hypochlorite and were not dried prior to insertion of the measurement file. Once the Root ZX indicated the C-D junction, self-curing resin was injected into the canal. The tooth was extracted and ground with a bur and Soflex disk. This was done until the terminus of the file and the root was revealed. The distance from the end of the file to the foramen(major diameter) was measure, and evaluated. The results were as follows: 1. In vitro study(A/B : difference between A and B) 1). The mean values of acutal length/dried canal length and actual length/saline irrigated canal length were 0.528㎜, and 0.525㎜ respectively. There is no significant difference between the means of acutal length/dried canal length and actual length/saline irrigated canal length. 2). Root ZX could locate the C-D junction at the point of 0.5㎜ inside of major foramen, in both dried canal and saline-irrigated canal. 2. In vivo study 1). Root ZX could locate the the C-D junction at the point of 0.5㎜ coronal to the major foramen in presence of 5.25% NaOCl. 2). Root Zx located a point that was perceived to be the apical constriction. The majority of file tip experimented were within the canal, not extended beyond the major foramen.

FEA와 다이나모메터를 이용한 자동차 디스크 브레이크의 열적 거동에 관한 연구

박범식,손영지,장성규,전언찬 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

While braking cars, a large amount of energy is taken into the brake system in a short period of time. This leads to some problems ; cracking of the disc, non-uniform wear of pad and disc, fade. Thus it is important to measure the contact thermal behaviour precisely between disc and pad. The measurements must be considered to design the brake system. The paper describes methods to analysis the problem of the thermal behavior on the ventilated disc with ANSYS-a program of FEA and a brake dynamometer. According to this way, the paper can present the error between the data by the dynamometer and the results of analysis by ANSYS.

胃癌細胞의 植物凝集素結合에 關한 免疫酵素組織學的 硏究

羅泳燦,廉範愚,金世民 고려대학교 의과대학 1984 고려대 의대 잡지 Vol.21 No.1

To evaluate the binding reactions of various phytohemagglutinins (PHAs) on the gastric carcinoma cells, the author had undertaken an experiment using purified PHAs, such as Concanavalin A(Con-A), wheat germ agglutinin(WGA), soybean agglutinin(SBA), Dolichos biflorus agglutinin(DBA), Ulex europaeus agglutinin I (UEA I), peanut agglutinin(PNA), Ricinus communis agglutinin I (RCA I), and Pinellia ternata agglutinin(PTA). The tissue samples used were gastric tissue from subtotal gastrectomy or fiberoptic biopsy, diagnosed by pathologists as well differentiated adenocarcinoma and poorly differentiated adenocarcinoma signet-ring cell type adenocarcinoma, and dysplasia. The results obtained are as follows; 1. On the well-differentiated adenocarcinoma, all the PHAs except UEA I showed cytoplasmic granular reactions of the tumor cells and linear reactions along the intraluminal borders of the tumor glands. 2. On the poorly differentiated adenocarcinoma, RCA I and UEA I showed cytoplasmic reactions, and other PHAs showed variable reactions from positive to focal positive. 3. In signet-ring cell carcinoma, PNA, SBA, RCA I and UEA I showed weak reactions in the cytoplasm. 4. On the dysplastic cells, Con-A, WGA, PNA, RCA I and PTA showed cytoplasmic reactions and SBA, UEA I and DBA showed no reaction. With the above results, the binding of PHAs on the tumor cells of the stomach reveled variable patterns, depending on the degree of differentiation and the kinds of PHAs used.

건축제도 변화에 따른 일반주거지 도시조직에 관한 연구

박기범,최찬환 대한건축학회 2003 대한건축학회논문집 Vol.19 No.10

The rapid industrialization and urbanization gave rise to the shortage of urban housing from the mid of 1900s. To solve housing problem the public policy, which was to increase housing supply, focused on the private movement like subdivision of single detached housing for multi households. Illegal multifamily housing was legitimated and then enlarged in volume, height, and density. But the introduction of multifamily housing as an urban housing did not considered the differences of urban structure which was different according to the land readjustment project. There are some differences in housing form according to the relation between Building Code and the conditions of urban structure. This study focuses on the analysis of urban tissue reflecting interrelation between residential structure and Building Code. To find out the relation between Building Code and urban structure manifested in the form of multifamily housing is the best way understanding urban tissue of residential area. The change of building code has led the change of housing form, conditions of urban structure has affected the differences of housing form from the 1990. From the research, under the same legislation there are differences in volume of housing according to the condition of plot like size and border with street, under the same residential structure the differences of regulation affected the form of housing. So understanding urban tissue is the key to organize appropriate landscape of residential area.

균류 분화과정의 유전적 조절기작

박범찬,이환희,박윤희,박희문 충남대학교 생물공학연구소 2003 생물공학연구지 Vol.9 No.1

Fungi are well suited for studying mechanism controlling development and cell differentiation in multicellular eukaryotes. The asexual and sexual reproductive cycles are tightly coordinated during the life cycle of Aspergillus nidulans. The asexual (mitotic) reproductive cycle involves the formation of a number of differentiated cell types. Successful formation of multicellular reproductive structures and spores (conidia) requires the establishment of spatiotemporal gradients in essential transcriptional regulators, such as brlA, abaA and wetA. Altered gene expression is coordinated with critical changes in the movement of nuclei and the regulation of the cell division cycle. Therefore, it has been proposed to define a central regulatory pathway. Several early regulatory genes involved in signal transduction pathway controlling asexual sporulation are also required for activating the central pathway. Sexual (meiotic) reproduction is more complex, requiring the differentiation of several specialized tissue types. Although technical difficulties have limited efforts to study the genetics of sexual fruiting-body formation directly, some recent progress has been made. With the recent availability of mutants blocked in sexual development, understanding the genetic interactions between genes that function primarily in determining sexual sporulation will be achieved in the near future.