고양이 줄무늬체 기저부에서 청색반점 신경원의 연접종말에 대한 전자현미경적 연구

김택수,천명훈,정진웅 대한해부학회 1997 Anatomy & Cell Biology Vol.30 No.4

軟鋼과 軟鋼 및 黃銅과 黃銅間의 Slip摩耗에 關한 硏究 : 摩耗의 荷重과 距離特性을 中心으로

李濁淳,權種完 嶺南大學校 工業技術硏究所 1975 연구보고 Vol.3 No.1

Wear which occurs in the sliding of metal pair is very complicated. Because it is made up the various factors which are combined in a complicated way. So, it is very hard to formulate simple equation. In this paper, the characteristics of wear distance and wear load have been studied by using cylindrical specimen of brass and mild steel with the Suzuki type wear testing machine. Wear test carried out for brass in the lubricant condition and for mild steel at the dry condition. The results obtained were as follows: 1) In the relation between friction load and weight of wear, mild steel which tested in the dry friction reached the maximum value of wear around 20kg load on 500 rpm and 24kg load on 1000 rpm. On the other hand, for brass which carried out lubricant condition, weight of wear and wear load is proportioned. 2) In the relation between wear distance and weight of wear carried out lubricant condition, between weight of wear and wear load is proportioned. In the relation between wear distance and weight of wear, initial wear phenomenon appeared at mild steel and brass showed steady wear around 8 km wear distance. 3) At the Holm's law of wear (V=Z ), the value range of factor Z is (1.135∼4.185) ×10 and average value 2.95×10 on 500 rpm. On the other hand value range of factor Z is (2.700∼7.750)×10 and averge value 5.715×10 on 1,000 rpm.

일부 아연광산지역에서의 Cadmium이 주민의 건강에 미치는 영향

남택승,홍종관,한구웅,박종안 順天鄕大學 1987 순천향대학논문집 Vol.10 No.1

실험적 간암 발생 과정에 출현하는 난원형 세포의 면역 조직화학적 연구

황택근,이중달,원치규 한양대학교 의과대학 1992 한양의대 학술지 Vol.12 No.1

Oval cells have been observed during chemical carcinogenesis in the livers of animals fed 2-acetylaminofluorene (2-AAF), a potent chemical carcinogen. Biological behavior of these cells remained poorly understood with regard to gepatic carcinogenesis. The author carried out the histological, enzyme histochemical and immunohistochemical studies of oval cells in the livers from 80 rats fed 2-AAF for five months. Throughout the experimental period oval cells along with hepatocytes and bile ductular cells were subjected to immunostain for monoclonal antibodies. The antibodies included those to carcinoembryonic antigen(CEA), alpha-fetoprotein(AFP), low molecular cytokeratin(CAM 5.2), prealbumin, and endothelial cells. Alkaline phosplatase(ALP) reaction to oval cells was also evaluated. The followings were results obtained: Oval cells appeared about the portal areas at the 10th day of the experiment. The cells penetrated the hepatic lobule as they proliferated. The proliferation of oval cells was most prominent at the 6th week and then the cells were gradually decreased in number until the late stage of the experiment. There were foci of transformation of oval cells to cholangiolar cells and foci of cholangiofibrosis made up of proliferated bile ductules. PAS reaction was negative on oval cells, where as hepatocytes were reactive for PAS. ALP reaction was positive on both oval cells and ductular epithelial cells. The hepatocytes were non-reactive for ALP. Both oval cells and bile ductular cells showed positive staining for AFP and CAM 5.2, and negative for CEA and prealbumin. Hepatocytes showed negative staining for AFP, CAM 5.2, CEA and prealbumin. However, an impressive finding that AFP- and CAM-positive hepatocytes were scattered through the hepatic lobules, was observed early during hepatocarcinogenesis. The results indicated that oval cells had no evidence of the conversion to hepatocytes in 2-AAF induced hepatocarcinogenesis, and that hepatocellular carcinoma arose not from oval cells. Oval cells showed immonohistochemical characteristics similar to those of the bile ductular epithelium.

"연자성 재료의 개발에 관한 연구"

김택기 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.1

In order to investigate the magnetization mechanism of a amorphous metallic materials and to develop a new soft magnetic materials, the magnetic and electrical properties in amorphous (Fe_(1-x)Co_x)_77Si_10B_13 alloys have been studied systematically. The specimen was prepared by rapid quenching technique. The coercive force and ratio of B_r/B_s were measured by a B-H loop tracer at 60Hz. The saturation magnetization was measured by a vibrating sample magnetometer from 77°K to 1200°K in vacuum of 2 10^-5 torr. The electrical resistivity was measured by four-probe technique from 300°K to 1100°K in vacuum of 2 10^-5 torr. The results are as follows; 1) The average magnetic moment per atom of 3d transition metals in amorphous (Fe_(1-x)CO_x)_77Si_10B_13 alloys calculated from composition and temperature dependence of the saturation magnetization indicates that the magnetization mechanism of amorphous (Fe_(1-x)CO_x)_77Si_10B_13 alloys can be interpreted by a Donor model. 2) According to the results of investigating the composition-dependence of the saturation magnetization, coercive force, B_r/B_s, Curie point, electrical resitivity, and crystallization temperature, amorphous (Fe_(1-x)CO_x)_77Si_10B_13 alloys show best soft magnetic characteristics between x=0.2 and x=0.4.

한국에 있어서의 국제이해교육 실태조사연구(基二) : 유네스코 협동학교를 대상으로

이택휘 서울 敎育大學校 1982 論文集 Vol.15 No.-

非晶質 Fe_80P_(20-x)C_x 合金 組成에 따른 機械的性質의 變化

金澤基,조성석 충남대학교 공업교육연구소 1978 論文集 Vol.1 No.2

The change of the fracture stress, the fracture strain, the Young' s modulus and the toughness of amorphous Fe_80P_(20_x)C_x with composition ranging from x=2 to x=8 has been investigated systematically. The fracture stress, the fracture strain, the Young's modulus and the toughness of amorphous Fe_80P_(20-x)C_x showed tendency to increase with increasing carbon content. It is considered that the fracture stress is increased with decreasing mean electron concentration of amorphous Fe_80P_(20-x)C_x.

비정질(Fe_(1-x)Ni_x) 77_Si_10B_13 합금의 전기적 특성

김택기,임영언,손홍재 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2

The electrical resistivity in amorphous (Fe_(1-x)Ni_x)_77Si_10B_13(0≤x≤1, interval of x : 0.1) alloys prepared by a rapid quenching method has been investigated as a function of Ni-concentration and temperature to study the relations between the structure and the properties of amorphous materials. The thickness of each specimen was derived from the density measured by the Archimedian method. The electrical resistance of the specimen was measured by 4-probe technique in the temperature range of 300-1100°K in the vacuum of 2 × 10^-5 torr. Findings follow: 1) The electrical resistivity for amorphous state except x=0.8 and 0.9 at room temperature is 1.5∼2 times as large as that for crystallized state and the electrical resistivity for both states reaches a maximum at about x=0.5 however, the electrical resistivity for x=0.8 and 0. 9 shows anomalous characteristics; i) the electrical resistivity for crystallized state is larger than that for amorphous state ii) the electrical resistivity for both states is very large in comparison with other compositions. 2) TCR (Temperature Coefficient of Resistivity) for amorphous state rises with increasing Ni-concentration and passes through a maximum at about x=0.5. 3) The crystallization temperature decreases linearly with increasing Ni-concentration.

효율적인 관리체계개선을 위한 교량관리 시스템의 개발(Ⅱ) : 교량의 신설 및 보수 우선순위 결정

허택녕,성재진 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

The majority of brides in our infrastructure were constructed in the years of the 1960's to 1970's when the growth of our transportation networks was less of an expansion and more of an explosion. These structures have performed so well, they have been so durable, that most of us, engineers or not, tent to take the bridge for granted. But the life of these structures will reach the stage when they will no longer be so durable, and we will no longer be able to take the bridge for granted. It is though that the rehabilitation and maintenance of them are needed. But the priority determination of rehabilitation and replacement of old bridge and the allocation of the limited funds are no small task. In this study, the bridge maintenance system(BMS) which can allocate the fund for bridge's rehabilitation and replacement are developed with of Visual C++6. Criteria for priority determination of rehabilitation and replacement of old bridges are implemented in the BMS based on literatures and reports. Also, in the BMS, the database which can maintains a record of the elements comprising a bridge and its relative condition and a description of the work that has been done to date on a structures as well as the work that is presently scheduled to be done is built. By the BMS, it is showed that the priority determination of old local bridge in Kyung-Nam area for their rehabilitation and replacement are maded, and the developed BMS is useful in the management of local bridges in Kyung-Nam area.

마우스 폐선종을 이용한 항발암 실험법

윤택구,김성호,오영란 대한암학회 1987 Cancer Research and Treatment Vol.19 No.1