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전력 트랜지스터의 특성에 미치는 다이아몬드상 카본 passivation 막의 효과
박정호,임대순,정석구,장훈,신종한,Park, Jung-Ho,Lim, Dae-Soon,Jung, Suk-Koo,Chang, Hoon,Shin, Jong-Han 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.11
Because of the novel characteristics such as chemical stability, hardness, electrical resistivity and thermal conductance, diamond-like carbon (DLC) film is a suitable materials for the passivation layers. For this purpose, DLC films are synthesized under various conditions and are characterized. Adhesive stregth is excellent and increased with the increase of the hydrogen gas flow rate. The resistivity of approximately 5.3X10$^{8}{\Omega}{\cdot}cm$ is measured by automatic spreading resistance probe analysis method. The thermal conductivity of DLC films is superior to that of PSG oxide and improved by increasing the hydrogen gas flow rate. The patterning techniques of the DLC films is developed using the lift-off and RIE methods to form 5${\mu}$m line. Finally, power transistor with the DLC film as passivation layer is fabricated and analyzed. The test result shows the improsved long-term stability and higher breakdown voltage.
김남포(Kim Nam-Po),신종한(Shin Jong-Han) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
As tilting train is the effective solution to provide faster passenger service on conventional railway lines without too costly modification of infrastructure, it is expected that tilting train will be put into service for Korean conventional Railway Lines. Very few passengers may suffer from motion sickness on conventional train and high speed train. But some sickness among passengers of tilting trains have been reported. Up to now, a standardized motion sickness index was mainly developed in the shipping domain. Therefore, there was a need for railway motion sickness index in order to predict and evaluate the motion sickness which is likely to be experienced by passengers. This paper is the preliminary investigation to propose the technical index related to motion sickness and nausea phenomena for the tilting train development and operation.
전후동력 새마을호 열차의 속도향상시 승차감에 관한 실험적 연구
구병춘(Goo Byeong-Choon),신종한(Shin Jong-Han),김남포(Kim Nam-Po),최성규(Choi Sung-Kyu) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
The speed-up of conventional trains is considered as one of the efficient methods to relieve traffic jam and to increase the capacity of transportation. In this study, we measured and analyzed the ride comfort of a push-pull Saemaeul Train with speed-up of 5㎞/h in curves and 10㎞/h on straight tracks as compared with present operation speed of the push-pull Saemaeul Trains. Four main lines-Honam, Kyungboo, Janghang, Kyungjeon- were chosen as representative lines for speed-up feasibility study. The increase of mean ride comfort index in case of speed-up is 0.5~2㏈. The mean ride comfort index of vertical direction in case of speed-up is 107~110 ㏈ for Honam line, 104~112 ㏈ for Kyungboo line, 108~112 ㏈ for Janghang line and 105~108 ㏈ for Kyungjeon line, which are rather high as compared with German trains of similar grade with maximum vehicle speed of 160 ㎞/h.
알루미나 슬러리의 첨가제에 따른 알루미늄 CMP 연마 특성에 관한 연구
이영목(Young-Mok Lee),신동희(Dong-Hee Shin),신종한(Jong-Han Shin),임대순(Dae-Soon Lim) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Aluminum generates the micro-scratch easily due to the soft and corrosive characteristics of Al material. Micro-scratch causes the electro-migration so that it finally undergoes short-circuit of the device. To optimize the Al-CMP process without defect, important roles of abrasive particle size and stability in the slurry should be understand. In this study, the effect of the additive addition on the particle size and dispersion characteristic in the slurry has been investigated. The variations of the removal rate and roughness as a function of the additive concentration were also studied. The removal rate increased with increasing concentration of the citric acid but decreased with increasing H₂O₂ concentration. The optimized roughness with addition of the O.6wt% PSS(Poly sodium 4-styrene-sulfonate) was achieved by the optimized dispersion and minimum particle size of the particles. The results of this study showed the material removal rate depended on the modification of the chemical reaction of the abrasive particle and Al film but the roughness depended on dispersion behavior of the abrasive particles.