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남일송,윤여일,김선규,김용현,이주영,목지오,윤석기,김철희,김영선,변동원,서교일,유명희 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2
Background: Most cases of Graves' disease have been treated by antithyroid drugs in Korea. The major drawbacks of antithyroid drugs are the relative high rate of relapse and the inconvinience of long term therapy. Measurement of TBII and TRH stimulation test have been considered as the most reliable tests predicting relapse, but the predictive power is not high enough to use in clinical situation. This study was performed to find good prognostic indicators in Graves' disease patients after the discontinuation of antithyroid drug therapy. Subjects and methods : We restrospectively evaluated 96 patients with Graves' disease who showed normal TRH test at the end of antithyroid drug therapy and were followed for more than one year. Serum T3, T4, T3/T4 ratio, TBII, Anti-TPO Ab and TGAb levels were measured at the time of diagnosis and at the end of therapy. Two to three months after withdrawal of antithyroid medication, serum TSH and free T3 responses to TRH were examined. These parameters were compared between the relapse group and the remission group. Results : Among the 96 patients, 22 patients(22.9%) relapsed(Group Ⅱ) and 74 patients(77.1%) remained in remmision(Group Ⅰ). No significant difference was observed between the relapse and the remission group in clinical parameters, serum T3, T4, TSH, T3/T4 ratio, TBⅡ and Anti-TPO Ab determined before and after treatment. Serum TSH and free T3 levels measured after TRH stimulation were also similar in both groups. Serum TGAb levels determined at the end of treatment were significantly higher in the remission group(p<0.05). Relapse following the discontinuation of therapy occured within 24 months in 72.7% of the relapsed cases. After 24 months, relapse rate was reduced significantly. Conclusion : These results suggest that high serum TGAb levels could be a favorable prognostic indicator for the long term remission of Graves' disease treated with antithyroid drugs, and may suggest that Hashimoto's thyroiditis is combined with Graves' disease in those patients.
남욱원,최철성,문신행,강희동 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
1983 년경 국내에서도 과학탐사 로케트와 인공위성이 발사될 예정에 있으며 이에 따라 X-선 천체물리학을 위한 방사선 센서의 국내 개발이 시급히 요청되는 바이다. 따라서 현재 방사선계측에 많이 이용되고 있는 방사선 센서들 중 국내에서 개발되어온 MWPC위치검출기를 소개하고 인공위성 혹은 과학탐사로케트에 탑재되어 X-선 천체물리학연구에 이용될 경우 연구 개발되어 나가야 할 방향을 제시하고자 한다. Domestic sounding rocket and scientific satellite are scheduled to launch around 1993. The development of radiation sensor is required to observe X-rays coming from celestial bodies by the use of those space vehicleS. In this study we introduce the multi-wire position sensitive detector and the future works of onboard detector for X-ray astrophysics.
남영우,김현철,황희연 崇實大學校 生産技術硏究所 1994 論文集 Vol.24 No.-
Aluminum hydroxide gels were formed from aluminum salts by precipitation method. These gels were aged and calcined to get γ- alumina. The effects of aging condition for aluminum hydroxide gels on the physical properties of γ- alumina were tested varying aging pH, time and temperature using aluminum sulfate as starting materials. The effect of starting materials were tested using aluminum sulfate, nitrate and chloride salts. Activated alumina prepared from Boehmite aged under the condition of pH 11 and 170℃ showed high surface area and large pore volume. Aging time above 1 day showed a little effect on the properties of activated alumina. Optimum aluminum salt concentration for high surface area and large pore volume was 4 wt%.
김남희,이상철,서영호 한국품질경영학회 2003 품질경영학회지 Vol.31 No.1
The purpose of this research is to identify if psychological temptation, site quality and sense of community influence user's flow and addiction and if causalities among flow, addiction, customer satisfaction and customer loyalty are different between Korean an Japanese online games. To perform our research, we use MCSF(Multi-group Confirmatory Factor Analysis) and MSEM(Multi-group Structural Equation Model). The empirical results of SEM(Structural Equation Model) including high-order-factor analysis indicate that all of paths in our model are the same for both countries. Therefore, site quality and sense of community have impacts on the flow, while on the other hand, psychological temptation has impacts on the addiction. Customer satisfaction and loyalty are positively related not with the addiction but with the flow. In addition, customer loyalty is significantly influenced by the flow and the customer satisfaction. In Conclusion, the empirical results of MSEM(Multi-group Structural Equation Model) indicate sense of community to flow, flow to loyalty and customer satisfaction to loyalty are different between Korea and Japan. This indicates that companies to penetrate into Japa online game industry should have a concern with Japanese Social and Cultural features and to develop strategies which correspond with Japanese culture.
김성희,김영철,김덕중,박남국 全南大學校 觸媒硏究所 1998 觸媒硏究 論文集 Vol.20 No.-
Complex metal oxide catalysts were tested for the removal of benzene from 150℃ to 300℃ in an atmospheric fixed bed flow reactor. Supported Mn and Ag increased catalytic activity. Particularly Mn had an effect on catalytic activity when it was a little an caused decreasing of catalytic activity when it was much because metallic Ag was decreased. La didn't have an effect on catalytic activity but stability. Supported Ag plated an important role in catalytic activity when it was metallic Ag which was present at low calcination temperature(400℃) but caused decreasing of catalytic activity at high calcination temperature(800℃) because it was transformed into Ag₂MnO₄.
정남용,박철희 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
The application of bonded dissimilar materials to such indurstries as automobiles, aircraft, rolling stock, electronic devices and engineering stuctures is increasing gradually because these materials, compared to the homogeneous materials, have many advantages for material properties. In spite of such wide applications of bonded dissimilar materials, the evaluation method of fracture toughness on interface crack in the bonded components has not been established clearly. In this paper, the stress intensity factors were analyzed by boundary element method(BEM) for the bonded scarf joints with a crack, respectively. From static fracture experiments of the bonded scarf joints, an evaluation of fracture toughness on interface crack in the bonded components was proposed and discussed.
DC방전에 대한 전류 및 전압 조건에서 1차원 전산모사
김희정,김형용,권득철,윤남식 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.1
여러 그룹들의 연구 결과로서 DC 방전 전산모사를 위한 여러 가지 수치해석적 방법들이 보고되어 왔다. 대부분의 방법들은 전극에 전압을 경계 조건으로 가정하고 전류를 구하는 방법인데, 때로는 전류값을 조건으로 주고 전극의 전압이 결정되는 방법이 필요한 경우도 있다. 본 연구에서는 전류값이 조건으로 주어진 경우에 전극의 전압이 결정되는 방법을 적용했으며, 1차원 전산모사를 통해 두 가지 방법에 의한 결과를 비교하였다. Various numerical simulation algorithms for simulating DC discharge were reported from many research groups. Most of reported methods uses terminal electrode voltage as a boundary condition to obtain current density. However, in some case, we need to obtain terminal voltage from boundary condition of current. In this paper, the method which obtain voltage under current condition is applied, and we compared the results of two methods through one-dimensional simulations.
움직임 추정과 웨이블릿 변환을 적용한 비디오 디코더용 3D 적응 comb 필터링에 관한 연구
한희철,김진상,조원경,김남섭 경희-다반 ASIC 설계교육센터 2002 경희-다반 ASIC센터 논문집 Vol.3 No.-
NTSC 비디오 신호에서 comb 필터링은 라인과 프레임 사이의 위상차를 이용하여 Y와 C를 분리하는 기술이다. comb 필터링의 가장 중요한 부분은 기준 라인을 가지고 가장 높은 상관관계를 가지는 라인을 찾는 것이다. 본 논문에서는 프레임 안에 라인 사이의 유사성을 계산하기 위해 움직임 추정과 웨이블릿 변환을 적용한 새로운3D Y/C 분리 방법을 제안한다 제안한 알고리즘을 comb 필터링에 적용하였을 때, 화질은 기존의 시간 영역의 3D comb 필터링보다 약 1~2dB 향상되었다. 차후 연구 과제로 NTSC 비디오 신호의 유사성 검출에 효율적인 웨이블릿을 찾는 것과 잡음에 대한 내성을 강화해야 하며 최종적으로 하드웨어로 구현하는 것이다.