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- 저자 : 김동용(Kim Dong-Young) (검색결과 29 건)
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플라즈마 표면처리가 표면에너지와 Cr코팅층 / 기판의 부착 특성에 미치는 영향
김동용 ( Dong Yong Kim ),정은욱 ( Eun Wook Jeong ),후이 ( Kwun Nam Hui ),최영선 ( Young Son Choe ),한정호 ( Jung Ho Han ),조영래 ( Young Rae Cho ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.10
Atmospheric plasma surface treatment (APST) was applied on the soda-lime glass and silicon wafer(Si-wafer) substrates for surface modification. The surface energy for the surface treated samples was measured using the wetting angle. The effect of APST on surface energy and interface properties between sputtered chromium (Cr) coatings and substrates was investigated. The surface energy increased linearly and reached a maximum value of 74 mJ/m2 by APST. The increase in surface energy is due to the increased value of the polar component in surface energy. When the samples were exposed to the air, the increased surface energy decreased and tended to have hydrophobicity. The work of adhesion for the surface treated samples was calculated using the data of surface tension for water. We demonstrated that the trend of work of adhesion for the samples was similar to the change of adhesion strength between sputtered Cr coatings and the surface treated substrates. (Received March 13, 2013)
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상압 플라즈마 표면처리가 기판과 코팅층 사이에 생기는 중간층과 부착특성에 미치는 영향
김동용 ( Dong Yong Kim ),박홍석 ( Hong Seok Park ),배광진 ( Kwang Jin Bae ),김종구 ( Jong Gu Kim ),조영래 ( Young Rae Cho ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.12
The effect of atmospheric plasma treatment on change in the interlayer and the adhesion strength between the substrate and the coating layer was investigated. Soda-lime glass and indium-tin oxide (ITO) coated glass plates were used as the substrate, and the surface energy was calculated from the wetting angle of liquids on the substrates. To study the effect of surface treatment on the adhesion strength between the substrate and the coating layer, chrome (Cr) thin film was deposited on the surface treated substrates by sputtering. For the analysis of the interlayer, auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) were used. The surface energy of the substrates increased as a function of exposure time for atmospheric plasma surface treatment. When the exposure time exceeded 20 sec, the surface energy increased to a saturated value of 76 mJ/m2. The adhesion strength between the substrate and Cr coating layer according to the surface treatment showed a similar trend of the surface energy. The atmospheric plasma surface treatment using argon and oxygen gases promoted the formation of an interlayer that was identified as chrome oxide (Cr2O3). The thicker chrome-oxide interlayer contributed to the increase in adhesion strength between the substrates and the Cr coating layer.
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김동용 ( Dong Yong Kim ),허희영 ( Hee Young Hurr ) 한국항공경영학회 2015 한국항공경영학회지 Vol.13 No.5
The purpose of the present research is to provide a directionality in the management strategy and operating activities of an airlines by analyzing determinants which may affect the operating profit of Korean airlines. Management financial statements of airlines and macroeconomic indicators for the last 15 years, 1Q 2000 to 4Q 2014, were utilized as research data. In addition, a research was performed to analyze leading indicators and trailing indicators of airlines management by applying the vector error correction model (VECM) method, the correlations analysis and the regression analysis which have been continuously utilized as base methods. The relationship between the international passenger load factor and the operating profit is found to show an accompanying relevance as well as a positive relatedness, which is similar to results of existing researches. On the other hand, a leading relevance of the international passenger load factor is found to be small and to the contrary, an available seat kilometer(ASK) and a transport cost of airlines are found to be leading indices. A domestic passenger fare is found to be a trailing index of the operating profit of an airlines. Also, a variance decomposition analysis (VDA) measuring a magnitude of affects with respect to an impact shows that a change in the ASK mostly affects the operating profit and that a change in the international passenger load factor exerts a relatively large affects to the operating profit in a short period of time but shows a decreasing, affecting power as the time passes by. Considering the analysis results above, it is determined that the international passenger load factor and a control as well as management of the ASK need to be focused to increase the operating profit rate of airlines. In addition to these facts, a care needs to be given to the passenger fare which shows a relationship as a trailing index.
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히트 싱크용 클래드메탈에서 두께 방향의 열전도 특성에 미치는 계면의 영향
김종구,김동용,김현,한병동,조영래,Kim, Jong-Gu,Kim, Dong-Yong,Kim, Hyun,Hahn, Byung-Dong,Cho, Young-Rae 한국마이크로전자및패키징학회 2015 마이크로전자 및 패키징학회지 Vol.22 No.3
A study on thermal properties for a single-layer metal and a 2-ply metal (clad metals) was investigated for the application of heat sink. For the single-layer metal, a stainless steel (STS) and an aluminum (Al) were selected. Also, a roll bonded clad metal with STS and Al was chosen for the 2-ply metal. The thermal conductivity of the sample was obtained from the thermal diffusivity measured by the light flash analysis (LFA), specific heat and density. Measured thermal property values were compared with the calculated values using the data from the references. For the single-layer metal, measured values for the thermal diffusivity and thermal conductivity were smaller than calculated values. Differences between measured and calculated values were about 6% and 18% for the STS and Al samples, respectively. For the clad metals, however, a large difference (55%) was observed. Here, a relatively small thermal conductivity measured by LFA was due to the existence of a interface between STS and Al in the clad metal. Such a interface reduces the moving velocity of free electrons and phonons in the clad metal. For the development of a high performance heat-issipation module with the multi-layer structure, the control of interface properties which determine thermal properties was confirmed to be important.
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잉곳 슬라이싱용 Saw Wire의 연삭마모에 미치는 인장특성과 미세조직의 영향
황빈,김동용,김회봉,임승호,임재덕,조영래,Hwang, Bin,Kim, Dong-Yong,Kim, Hoi-Bong,Lim, Seung-Ho,Im, Jae-Duk,Cho, Young-Rae 한국재료학회 2011 한국재료학회지 Vol.21 No.6
Saw wires have been widely used in industries to slice silicon (Si) ingots into thin wafers for semiconductor fabrication. This study investigated the microstructural and mechanical properties, such as abrasive wear and tensile properties, of a saw wire sample of 0.84 wt.% carbon steel with a 120 ${\mu}M$ diameter. The samples were subjected to heat treatment at different linear velocities of the wire during the patenting process and two different wear tests were performed, 2-body abrasive wear (grinding) and 3-body abrasive wear (rolling wear) tests. With an increasing linear velocity of the wire, the tensile strength and microhardness of the samples increased, whereas the interlamellar spacing in a pearlite structure decreased. The wear properties from the grinding and rolling wear tests exhibited an opposite tendency. The weight loss resulting from grinding was mainly affected by the tensile strength and microhardness, while the diameter loss obtained from rolling wear was affected by elongation or ductility of the samples. This result demonstrates that the wear mechanism in the 3-body wear test is much different from that for the 2-body abrasive wear test. The ultra-high tensile strength of the saw wire produced by the drawing process was attributed to the pearlite microstructure with very small interlamellar spacing as well as the high density of dislocation.
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대역 확산 전력선 통신을 위한 양방향 적응 결합기 설계
劉永奎(Young-Gyu Yu),禹大鎬(Dae-Ho Woo),崔碩佑(Seok Woo Choi),金東龍(Dong Yong Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.3
This paper presents the new power line coupler which is applicable to spread spectrum power line communications. The proposed coupler maintains the adequate value of a capacitor between the transmitter mode and the receiver mode using a switch. In the transmit mode, the relatively high value of the capacitor is chosen to minimize the attenuation of transmitted signals. In the receiver mode, the value of the capacitor is chosen to be small enough so that the coupler attenuates power line noises. This coupler reduced the magnitude distortion due to having a high Q value and the power consumption caused by the AC current flowing into the capacitor. The simulation and measurement results show the improved performance in the transmitter and receiver mode, respectively.
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