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강필선(Pilsun Kang),배수우(Suwoo Bae),송순호(Soonho Song),황정호(Jungho Hwang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The aim of this study is to find out the condition that generates maximum H2 through the calculation of equilibrium model with conditions of pyrolysis gases of Refuse Plastic Fuel(RPF). This study deals with the computational simulation of a RPF gasification using an equilibrium model based on minimization of the Gibbs free energy. An equilibrium analysis was carried out to determine species composition of Syngas in RPF gasification and reactions to variation of temperature, O₂/Fuel ratio and Steam/Fuel ratio. Calculated results showed that O₂/Fuel ratio, Steam/Fuel ratio and temperature affected on mole fraction of H₂, CO.
RPF 열분해 가스화시 합성가스 조성에 대한 화학평형 계산
강필선(Pilsun Kang),배수우(Suwoo Bae),송순호(Soonho Song),황정호(Jungho Hwang) 한국연소학회 2007 한국연소학회지 Vol.12 No.4
The aim of this study is to find out the condition that generates maximum H2 through the calculation of equilibrium model with conditions of pyrolysis gases of Refuse Plastic Fuel(RPF). This study deals with the computational simulation of a RPF gasification using an equilibrium model based on minimization of the Gibbs free energy. An equilibrium analysis was carried out to determine species composition of Syngas in RPF gasification and reactions to variation of temperature, O₂/Fuel ratio and Steam/Fuel ratio. Calculated results shows that hydrocarbons in pyrolyzed gas are converted to synthesis gas which is formed on hydrogen and carbon monoxide.
알칼리 흡수제의 탄산화반응을 이용한 고농도 CO<sub>2</sub> 포집특성
김병환 ( Byung-hwan Kim ),강필선 ( Pil-sun Kang ),유승관 ( Seung-kwan Yoo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회지 Vol.33 No.3
Mineral carbonation is one of the safest permanent carbon dioxide sequestration methods. Carbon Capture & Utilization (CCU) is a process that utilizes available resources by removing carbon dioxide in a method of mineral carbonation. It can be applied to industries producing high carbon dioxide emissions. This study aims to investigate the absorption performance of carbon dioxide at high concentrations. Calcium hydroxide suspension was used as an absorbent. In addition, NaOH and Mg(OH)<sub>2</sub> were used as additives. Carbon dioxide removal efficiency with NaOH increased from 30% to 90% when the additive amount was increased from 1wt% to 3wt%. In the case of Mg(OH)<sub>2</sub>, carbon dioxide absorption efficiency was minimal regardless of the additive amount. In addition, the solid byproducts werec onfirmed by X-ray diffraction spectra and SEM images.
하드 디스크 드라이브에서 Smooth 디스크와 LZT 디스크가 입자 발생에 미치는 영향
이대영 ( Dae Young Lee ),허선영 ( Sun Young Huh ),강필선 ( Pil Sun Kang ),황정호 ( Jung Ho Hwang ),조긍연 ( Keung Young Cho ),강태식 ( Tae Sik Kang ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
The head to disk spacing must be decreased to increase recording densities in hard disk drives. Recently, to decrease the head to disk spacing, smooth disk having no bumps onto the lading zone has used. In this research, we compared the number of particles generated in HDD with smooth and textured disks. We used a sampling method using a particle sampler and a epe (condensation particle counter) to detect particles in HDD. First, we sampled and counted particles generated with disk rotational speed and various rest times when the smooth disk and textured disks were used, then analyzed the sampled particles by SEM (scanning electron microscopy) and AES (auger electron spectroscopy). In results of measuring particles, more particles in case of LZT disk drive generated than that of the smooth disk drive in all test modes. The number of particles generated in the smooth disk was very low. The particle generation increased as the rest time increased (smooth/LZT disks) and more particles in case of LZT disk drive generated than that of the smooth disk drive. In results of analyzing particle components, AI, Ti, Si components were detected and we could not found differences between components in case of smooth/LZT disk drive.
HDD에서 Smooth 디스크와 Texture 디스크가 HDI의 마찰대전에 미치는 영향
이대영 ( Dae Young Lee ),이래준 ( Rae Jun Lee ),강필선 ( Pil Sun Kang ),한제희 ( Je Hee Han ),황정호 ( Jung Ho Hwang ),김대은 ( Dae Eun Kim ),조긍연 ( Keung Youn Cho ),강태식 ( Tae Sik Kang ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
The tribocharge build-up in the slider disk interface can cause ESD (electrostatic discharge) damage. In turn, ESD can cause severe melting damage to MR or GMR heads. We investigated the tribovoltage/current build-up with smooth and textured disks in HDD, operating at increasing disk accelerations. We found that tribovoltage/current were generated during pico-slider/disk interaction and those levels were about 0.1 ~ 0.3 V and 10 - 40 pA, respectively. Tribovoltage/current were abruptly increased and dissipated within the acceleration time in the case of textured disk but in the case of smooth disk, tribovoltage was continuously increased until the end of uniform velocity region and the tribocurrent did not dissipate within the acceleration time. In the case of textured disk, tribovoltage/current was reduced with increasing disk acceleration, but in the case of smooth disk it was increased.