우리나라 유방아마에서 CYPIA1, EPHX 유전자 다형성의 역할

최지엽,유정희,이은옥,유근영,박수경,안세현,노동영,최국진,강대희 대한암예방학회 2002 Journal of cancer prevention Vol.7 No.3

중학교 과학 교과서 분별 증류 실험의 비교 분석 및 개선

柳五鉉,崔文永,宋周眩,권정근,白盛惠,朴國泰 한국교원대학교 과학교육연구소 2001 청람과학교육연구논총 Vol.11 No.1

이 연구의 목적은 제 6차 교육과정에 의한 중학교 1학년 과학 교과서 분별 증류 실험의 문제점을 파악하고, 중학생들이 분별 증류 실험을 능률적으로 수행할 수 있는 실험 방법을 제시하고자 하는 것이다. 이를 위한 첫 번째 단계로서 현재 사용되고 있는 8종의 과학 교과서를 분별 증류 실험 장치와 액체 혼합물의 종류에 따라 6가지로 분류하였다. 두 번째 단계로서 액체 혼합물을 가열 방법에 따라 직접가열과 물 중탕 가열로 나누어 교과서 실험과정에 따라 같은 실험을 세 번 실시하였다. 세 번째 단계로서 실험 결과의 문제점을 해결하기 위한 대안 실험을 실시하였다. 대안 실험에서는 알코을 램프로 직접가열 하는 방법과 기름 중탕으로 가열하는 방법, 그리고 가열 맨틀을 사용하여 가열하는 방법을 사용하였다. 연구결과, 가지 달린 둥근 플라스크를 직접 가열하는 실험 결과가 가지 달린 시험관을 물 중탕으로 가열하는 실험 결과보다 이론적인 결과에 근접하였다. 그리고 가지 달린 둥근 플라스크를 직접 가열하는 실험에서 플라스크 윗 부분을 보온해 주는 실험이 보온하지 않은 실험보다 실험 결과가 더 나았다. 대안 실험에서는 액체 혼합물의 증류 온도 증가를 보면서 가열 맨틀의 가열 온도를 을려 준 실험의 결과가 이론적인 결과에 가장 가까웠다. 이러한 연구 결과로부터 가지 달린 시험관을 물 중탕으로 가열하는 분별 증류 실험 장치는 탐구실험 수업에 부적절한 것이므로 개선이 요구되며, 중학교 과학실 여건을 고려할 때, 액체 혼합물의 증류 온도 증가를 보면서 가열 맨틀의 가열 온도를 변화시키는 분별 증류 실험이 가장 능률적인 방법임을 알 수 있었다. The purpose of this study was to find out the problems on the fractional distillation experiments in the middle school science textbooks based on the 6th curriculum and to suggest an efficient experiment method for the middle school students. The first step was the classification of the experiments in 8 science textbooks according to heating apparatus and liquid mixtures. The second step was doing each experiment 3 times followed by the experimental process in the textbooks. The third step was developing the alternative experiments for solving the problems found in the second step. The heating method used in the alternative experiments were direct heating, oil bath, and heating mantle. The results of the second step showed that the direct heating experiment of branched round flask was more close to the theoretical prediction than the experiment of water bath heating of branched test tube. Also the direct heating experiment of thermally insulated branched round flask was better than the result of the experiment which was not insulated. The results of the third step showed that the experiment using heating mantle regulated heating power by observing the temperature of distillate gave the closest result to the theoretical prediction. From the above results, it is concluded that the experiment using branched test-tube with water bath heating is not adequate for the fractional distillation and an alternative experiment using insulated branched round flask with heating mantle regulated heating power during experiment is recommended.

열응답성 나노복합재료의 합성과 LCST에서의 열적특성

김정필,최현국,서길수 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2

Thermal responsive nanocomposite were synthesized by copolymerization of N-isopropyl acrylamide and methylene bisacrylamide(crosslinking monomer) in an aqueous suspension of MAPTC-montorillonite at room temperature. Hydrogels containing 2.0 ∼5.0wt% of montmorillonite exhibited a lower critical solution temperature(LCST) similar to unmodified PNIPAM hydrogel (approximately 33.7℃). However, hydrogels containing 10wt% montmorillonite did not exhibit a measurable LCST. TGA result shows thermal stability of thermal responsive nanocomposite imoroved a little more than the thermal responsive polymer.

표면개질 실리카막을 이용한 CO_2 선택투과분리

김성수,최현교,박홍채,김태옥,서봉국 한국환경과학회 2000 한국환경과학회지 Vol.9 No.4

To improve CO_2 permselectivity, a modified silica membrane was prepared by chemical vapor deposition with tetraethoxysilane(TEOS)-ethanol-water, and TEOS-ethanol-water-HCI solution at 300-600℃. The silica was effectively deposited in the mesopores of a γ-alumina film coated on a porous α-alumina tube by evacuating the reactants through the porous wall. In this membrane, CO_2 interacts, to some extent, with the pore wall, and CO_2/N_2 selectivity then exceeds the value of the Knudsen diffusion mechanism, while the membrane derived from TEOS alone has no CO_2 selectivity. The silica membrane prepared from TEOS-ethanol-water-HC1 solution showed that CO_2 permeance was 2.5×10 exp (-7)㏖/s^-1. m^-2. Pa^-1 at 30℃ and CO_2/N_2 selectivity was approximately 3. The CO_2 permeance and selectivity was improved by enlarging the surface diffusion with modification of chemical affinity of the silica pores.

인공 치아우식 발생 모델에서 디지털 방사선 공제술을 이용한 인접면 치아우식증의 진단

박정훈,최용석,황의환,이기자,최삼진,박영호,김경숙,진현석,홍경원,오범석,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : The purpose of the experiment was to evaluating the diagnostic ability of dental caries detection using digital subtraction in the artificial caries activity model. Materials and Methods : Digital radiographies of five teeth with 8 proximal surfaces were obtained by CCD sensor (Kodak RVG 6100 using a size #2). The digital radiographic images and subtraction images from artificial proximal caries were examined and interpreted. In this study, we proposed novel caries detection method which could diagnose the dental proximal caries from single digital radiographic image. Results : In artificial caries activity model, the range of lesional depth was 572-1,374 μm and the range of lesional area was 36.95-138.52mm². The lesional depth and the area were significantly increased with demineralization time (p<0.001). Furthermore, the proximal caries detection using digital subtraction radiography showed high detection rate compared to the proximal caries examination using simple digital radiograph. Conclusion : The results demonstrated that the digital subtraction radiography from single radiographic image of artificial caries was highly efficient in the detection of dental caries compared to the data from simple digital radiograph.

Compass 연산자를 이용한 Edge의 방향정보 표현

이병일,최현주,최흥국,전순미 인제대학교 1998 仁濟論叢 Vol.14 No.1

에지(edge)의 검출은 영상처리를 하기 위한 전처리 단계로서 중요하고도 기초가 되는 부분이다. Compass 기울기 연산자는 방향에 따른 마스크를 사용하여 에지를 검출하여 주는데, 본 논문에서는 이러한 Compass 기울기 연산자를 이용하여 찾아지는 에지를 방향에 따라서 색상을 지정하여 표현함으로써 에지 정보의 방향성을 시 각화하도록 하였다. 예제 이미지는 임의의 타원으로 구성된 실험용 이미지와 다른 하나는 쥐와 운동 신경조직을 현미경으로 확대하여 본 이미지이다. Digital Image Processing is divided into two branches. One is Improvement of Image Information which helps human beings to understand image, and another is Image Data Analysis which helps the machine to have cognizance of image. Edge Detection is indispensable part to apply two branches, for it is basic application. Edge Detection is important and basic preprocess at Image Processing. Edge can be found by Compass operator as direction with 3×3 Masks. Compass operator has 8 element to be compared. Each has an information about direction of an edge. To visualize edge information, We propose the method of edge detection as direction showed by color. First, We had experiment on 4-Direction, then on 8-Direction. 8-Direction 8-Color method was better than 4-Direction 4-Color method, for Compass operator had 8 elements. Result Image shows the color which has direction information.

NiO 첨가량에 따른 PAN-PZT계 세라믹스의 압전 및 유전특성

박타리,이동균,최지원,고태국,김현재,윤석진 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

신부전이 동반된 당뇨병 환자에서 발생된 침습성 모균증 : 수술과 Liposomal amphotericin B 및 GM-CSF 병합 요법에 의한 성공적인 치험 1예

이원영,오기원,임국희,장재혁,이동건,최정현,강무일,신완식,차봉연,이광우,손호영,강성구 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.4

저자들은 신부전이 동반된 당뇨병 환자에서 발생된 부비동형 모균증에 대하여 수술과 함께 liposomal amphotericin B 및 GM-CSF의 복합치료를 하여 성공적으로 치료한 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Mucormycosis (zygomycosis) primarily affects diabetic or immunocompromised patients and typically progresses rapidly, necessitating surgical excision and antifungal therapy with amphotericin B. Large doses of amphotericin B are needed for cure, but it has the risk of causing significant renal toxicity. The recent development of liposomal amphotericin B allows antifungal therapy to be administered with potentially improved efficacy and reduced nephrotoxicity. We have experienced a case of paranasal mucormycosis successfully treated with surgery, liposomal amphotericin B and GM-CSF. A 59-year-old male suffering from diabetes mellitus for 6 years was admitted with pain at left maxillary area. He was diagnosed as mucormycosis after cytologic exam on the necrotic nasal mucosa, which showed typical hyphae. He have had diabetic nephropathy with macroproteinuria and had rapidly rising serum creatinine levels with the amphotericin B treatment: creatinine levels reverted to basal level with the use of liposomal amphotericin B. Despite surgical excision and continued antifungal therapy, his infection was not effectively controlled. Therefore, GM-CSF was administered additionally to improve phagocytic activity of leukocytes. He was finally cured after receiving a combination of aggressive surgery, liposomal amphotericin B and GM-CSF. To our knowledge, this is the first detailed clinical description of the treatment of mucormycosis with liposomal amphotericin B in Korea.

Synthesis, optical and electrochemical properties of poly(N-bromo-2-ethynylpyridinium bromide)

Choi, Hyun-Kuk,Lim, Kwon Taek,Sree, Vijaya Gopalan,Jin, Sung-Ho,Gal, Yeong-Soon Informa UK (TaylorFrancis) 2018 Molecular Crystals and Liquid Crystals Vol.663 No.1

Role of coronary CT angiography in anomalous high take-off of right coronary artery with ST elevation myocardial infarction: a case report

Hyun Kuk Kim,Sung Soo Kim,Young Jae Ki,Dong Hyun Choi,Keun Ho Park 조선대학교 의학연구원 2021 Medical Bilogical Science and Engineering Vol.4 No.2

Anomalous high take-off of the right coronary artery (RCA) ostium above the sinuses of valsalva is extremely rare. It was not well visualized on conventional coronary angiography. A 52-year-old man was referred to emergency department presenting as chest pain. Because electrocardiography showed ST elevation in the inferior lead, he underwent emergent cardiac catherization, which revealed mild stenosis in the left coronary artery. However, the ostium of the RCA could not be found arising from the coronary cusp despite using aortogram with pigtail. Intraprocedural coronary computed tomography angiography showed a near total occlusion in the middle RCA, which had an anomalous take-off from the left anterior superior aspect of the ascending aorta, 2 cm above the left main coronary artery. Judkins left 4 guiding catheter via femoral approach could be engaged in the ostium of RCA. Successful percutaneous angioplasty using the Guidezilla extension catheter as additional backup support was performed.