Search | Korea Science

Lee, Yong-Eun;Lee, Yong-Hyun;Lee, Hyung-Jun;Park, No-Cheol;Park, Kyung-Su;Park, Young-Pil
- Proceedings of the Korean Society for Noise and Vibration Engineering Conference
- /
- 한국소음진동공학회 2007년도 추계학술대회논문집
- /
- pp.1276-1279
- /
- 2007
The main objectives of the Load/Unload are no slider-disk contact and no media damage. But, it remains unsolved technical problems on the unloading process. While the slider climbs up the ramp at the outer edge of the disk, the possibility of the slider-disk contact by lift-off force and rebound of the slider increases. Keeping in mind of these points, to prevent the slider-disk contact, we apply the disk bump on disk outer edge proceeding unload. First, referring to the simulation results, we select the optimal bump shapes to improve unload performance by unload analysis. Second, the disk bump is mechanically manufactured by pressing disk surface using tungsten tips. The bumps are variously processed by changing pressing pressure of tungsten tips. After confirming bump shape by nano-scanner, the optimal bump shape is applied to experimental unload process. Through this experiment, it is conformed that the unload performance was improved by using the optimal disk bump to prevent the slider-disk contact.
PDF

Ji, Min-Young;Park, Hee-Gon;Kwak, Dong-Hoon;Park, Young-Ja;Jung, Kyu-Yong;Do, Su-Il;Choo, Young-Kug
- Proceedings of the Zoological Society Korea Conference
- /
- 한국동물학회 2000년도 공동 춘계학술대회
- /
- pp.76.2-76
- /
- 2000
No Abstract, See Full Text
PDF

Choe, Hui-Jeong;Hong, Gyeong-Pyo;No, Chung-Hwan;Park, Yong-Ju;Myeong, Jeong-Gu;Kim, Jong-Man;Park, In-Seok
- Proceedings of the Korean Aquaculture Society Conference
- /
- 한국양식학회 2004년도 수산관련학회 공동학술대회 발표요지집
- /
- pp.372-373
- /
- 2004
PDF

Park, Yong-Seong;Chun, Kwang-Min;Park, Kwang-Seo;Lee, Jong-Hyun;Cho, Seong-Woo
- 한국연소학회:학술대회논문집
- /
- 한국연소학회 2001년도 제23회 KOSCO SYMPOSIUM 논문집
- /
- pp.179-184
- /
- 2001
The characteristics of $NO-NO_2$ conversion and soot oxidation by corona discharge are investigated experimentally. The discharge current decreases with the increase of oxygen concentration and it increases more sharply for anode corona than for cathode corona as discharge voltage increases after corona onset voltage. $NO-NO_2$ conversion increases with the energy density of corona discharge and the addition of $O_2$ in a base $N_2$ gas. Soot oxidation occurs at approximately $480^{\circ}C$ in a mixture of 21% $O_2$, base $N_2$ gas, and enhances as temperature increases. The initiation temperature of soot oxidation advances greatly to about $280^{\circ}C$ with the addition of 300ppm $NO_2$, which is generated from the conversion of NO to $NO_2$ by corona discharge. CO is generated at higher temperature by about $50{\sim}100^{\circ}C$ than $CO_2$ in the process of soot oxidation.
PDF