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추현식 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.1
For the surface modification of ceramic board. IAR(Ion Assisted Reaction was introduced to pre-treatment the ceramic surface. The adhesion strength of electro less Cu and electro Cu plating layer accompanied by IAR treatment of ceramic shows 150gf/㎠ which is three times higher than that without the IAR treatment. The wettability and adhesion strength between ceramic and Cu plating layer increased as the irradiation quantity of N₂ increased in the IAR treatment. The adhesion strength significantly increased to 450gf/cm after formation of Cr seed.
WO₃분말로 부터 WC를 제조 할 때 탄소량의 변화에 관한 연구
秋現植 조선대학교 생산기술연구소 1980 生産技術硏究 Vol.1980 No.-
This paper is attempted to study on the variation of carbon in the productive process of we from WO₃. In order to test the variational process of carbon, furnace were used a nitrogen atmosphere and a hydrogen atmosphere. Putting a mixture of WO₃and C into the furnaces and heating them. The result was producted WC of good quabity. Heating the testing materials, a mixture of carbon content was changed from 1150℃ to 1650℃ in the nitrogen furnace and especially decreased at 1600℃ in the hydrogen furnace. The severe control of the carbon content of the product was possible by this two-step carburization method.
製鐵 製鋼用 耐火brick에 關한 硏究 : 使用上 材料選擇을 中心으로
秋現植 朝鮮大學校 工科大學 1972 論文集 Vol.1 No.-
Refactory materils are indispensable to furnaces as well as furnaces are indispensable to metallurgy , It is very important to select proper refractory materials which are necessary to furnaces & their accessary equipments for producing steel-goods from iron ores. In this thesis 1 first of all considered merits and defects of refraerials materials on the way of present use and then studied furnace materials proper to that, expeeting that furnace smelting operation is much changed in future. I think it is nelessary to study the choice & manufacture of furnace materiais which sujt best to smelting operations.
Effects of Social Capital on Subjective Health in the Community Indwelling Elderly
추현식,탁영란 한국지역사회간호학회 2018 지역사회간호학회지 Vol.29 No.2
Purpose: The aim of this study is to examine a path model on the relationship among social capital, physical activity and subjective health status in the community indwelling elderly. Methods: The study was conducted utilizing the 2014 Seoul Survey, in the method of analyzing cross-sectional design and secondary data. Among 45,497 participants in total, the data of 4578 adults aged 65 or above was analyzed. Social capital was measured by social trust and social participation. Physical activity was measured by regular exercise. Additionally, a numerical rating scale was used to assess subjective health status. The data were analyzed using descriptive statistics, Pearson‘s correlation coefficients and path analysis. Results: Social participation and physical activity showed a direct effect on subjective health status in community indwelling elderly while social trust and physical activity showed an indirect effect on their subjective health status. The hypothetical path model of community indwelling elderly’s subjective health status was proved correct. Conclusion: Findings from this study indicate that health-promoting intervention for community indwelling elderly should consider social trust and participation.
레이저 빔 프린터 나노가공품의 표면정밀도 향상에 관한 연구
추현식,성백섭 조선대학교 생산기술연구소 2006 生産技術硏究 Vol.28 No.2
Recent advances in high-tech industry and ultra precision machining technology have led to the development of a wide variety of new materials. The demand for LBP Polygon Mirror finishing parts has increased, which are mainly used for the motor of the printer. so ultra precision machining technology is required. It is important for Polygon Mirror to have the enough strength for the highUspeed rotation and high quality Polygon line surface. Polygon Mirror, high-tech nano finishing part, is used for optical instrument such as laser phnters, digital copiers, laser fax machines and bar-code readers, etc. Therefore, we have evaluated the machining precision of matehal surface and tried to determine the optimum machining conditions in order to improve machining precision of S3M. Also we have applied to the production line to reduce the defective proportion. As a result, we have obtained high quality precision of side surface machining in case that the number of revolutions, speed and movement were constant and cutting rate was 0.05 mm. Also we have obtained the same results from the 30 test specimens with constant rough-cutting during the Polygon line machining. The defective proportion decreased from 12 percent to 4-6 percent when the machining conditions selected during the test were applied to the real production line. It is expected that the defective proportion of products can be reduced if we conduct further research on the cleaning and heat treatment process.
금속과 세라믹기판의 접착력에 미치는 초음파 교반의 영향에 관한 연구
추현식,류일광 조선대학교 생산기술연구소 1998 生産技術硏究 Vol.20 No.2
Recently, ceramic substrate is selected for an alternative substrate board for high-speed circuits due to its low-thermal expansion. Generally, metallization of ceramic substrate is fabricated by electroless copper plating. But it has been troubled for its weak adhesion strength between the ceramic board and copper layers. To enhance adhesion strength, we have studied effects of ultrasonic agitation for adhesion strength between metal and ceramic boards. In catalyst treatment, high density Pd nuclei of small size were formed during ultrasonic agitation compared that of no stirring. In this case, the adhesion strength was enhanced about 20% by using ultrasonic agitation.
Ni-Cr-Mo鋼의 熱處理에 따른 機械的 性質과 衝擊靭性에 關한 硏究
秋現植,梁權承,崔秉起 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1
The influence of heat treatment on the mechanical properties and the charpy impact toughness of Ni-Cr-Mo Steel in austenitizing temperature range between 750℃~1100℃ and tempering temperature range between 250℃~500℃ was studied. The results obtained from this study are summarized as follows; 1) The most impact energy is obtained at about 900℃ of austenitizing temperature, and at the temperature of more than 900℃, impact energy decreased. That was seen to be caused from coarse of martensite structure. 2) As the austenitizing temperature increased, strength and elongation decreased. As tempering temperature increased, strength and hardness decreased, but elongation increased. 3) When the tempering temperature was 350℃, the impact energy was lowest and as the temperature was high, the impact energy increased. 4) As the austenitizing time under constant austenitizing temperature was long, hardness and impact toughness decreased.