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알루미나-아연붕규산염 유리를 이용한 저온 소결 다공성 세라믹스의 제조 및 특성
김관수,송기영,박상엽,김신,김성진,윤상옥,Kim, Kwan-Soo,Song, Ki-Young,Park, Sang-Yeup,Kim, Shin,Kim, Sung-Jin,Yoon, Sang-Ok 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
The low-temperature preparation of porous ceramics was carried out using mixtures of alumina-zinc borosilicate (ZBS) glass. The compositions of alumina-ZBS glass mixture with PMMA pore-former were unfortunately densified. Because PMMA was evaporated below the softening point of ZBS glass ($588{^{\circ}C}$), the densification through the pore-filling caused by the capillary force might occur. Howerver, those with carbon possessed pores where carbon was evaporated above the softening point. The porous ceramic having 35% porosity was successively fabricated by the low-temperature sintering process below $900{^{\circ}C}$ using 45 vol% of alumina, 45 vol% ZBS of glass, and 10 vol% of carbon as starting materials.
LTCC 기판재료 응용을 위한 다양한 충전제 함유 CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> 유리복합체 연구
김관수,장호순,신현호,김인태,김신,한용현,윤상옥,Kim, Kwan-Soo,Jang, Ho-Soon,Shin, Hyun-Ho,Kim, In-Tae,Kim, Shin,Han, Yong-Hyun,Yoon, Sang-Ok 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
Influences of ceramic filler types and dose on the sintering, phase evolution, and dielectric properties of ceramic/CaO-$Al_2O_3-SiO_2$ glass composites were investigated. All of the specimens were sintered at $900^{\circ}C$ for 2 h, which conditions are required by the lowtemperature co-firing ceramic (LTCC) technology. Ceramic fillers of $Al_2O_3,\;SiO_2$, kaolin, and wollastonite were used. The addition of $Al_2O_3$ filler yielded the crystalline phases of alumina and wollastonite, and the densification over 95% of the relative density was achieved up to 50 wt% addition of the filler. For the cases of the fillers of $SiO_2$, kaolin, and wollastonite, crystalline phases of quartz, mullite, and wollastonite formed, while the densification decreased monotonically with the filler addition. In overall, all the investigated fillers with 10 wt% addition resulted in a reasonable sintering (over 95 %) and low dielectric constants (less than 6), demonstrating the feasibility of the investigated composites for application to a LTCC substrate material with a low dielectric constant.
Ultrathin-body SOI MOSFETs에서 면방향에 따른 정공의 이동도 증가
김관수,조원주,Kim, Kwan-Su,Cho, Won-Ju 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
We investigated the characteristics of UTB-SOI pMOSFETs with SOI thickness($T_{SOI}$) ranging from 10 nm to 1 nm and evaluated the dependence of electrical characteristics on the silicon surface orientation. As a result, it is found that the subthreshold characteristics of (100)-surface UTB-SOI pMOSFETs were superior to (110)-surface. However, the hole mobility of (110)-surface were larger than that of (100)-surface. Especially, the enhancement of effective hole mobility at the effective field of 0.1 MV/cm was observed from 3-nm to 5-nm SOI thickness range.
높은 이동도 특성을 가지는 Strained-Si-on-insulator (sSOI) MOSFETs
김관수,조원주,Kim, Kwan-Su,Cho, Won-Ju 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.8
We investigated the characteristics of Strained-Si-on-Insulator (sSOI) MOSFETs with 0.7% tensile strain. The sSOI MOSFETs have superior subthreshold swing under 70 mV/dec and output current. Especially, the electron and hole were increased in sSOI MOSFET. The electron and hole mobility in sSOI MOSFET were 286$cm^2/Vs$ and 151$cm^2/Vs$, respectively. The carrier mobility enhancement is due to the subband splitting by 0.7% tensile strain.
213-nm Solid-State Laser 굴절교정각막절제술 시 각막표면 수분의 영향
김관수,최철영,차흥원,Kwan Soo Kim,Chul Young Choi,Hungwon Tchah 대한안과학회 2008 대한안과학회지 Vol.49 No.11
Purpose: To investigate the effect of surface fluid on the ablation rate and efficacy of 213-nm solid-state laser during photorefractive keratectomy (PRK). Methods: Twelve rabbits (24 eyes) underwent myopic PRK for the correction of 10 diopters using 213-nm solid-state laser. Photoablation was performed with removal of corneal surface fluid using the Weckcel® sponge every 5 seconds in one eye and without removal of corneal surface fluid in the control eye. The mean central corneal thickness (CCT) was evaluated preoperatively, and at 1 week, 4 weeks postoperatively. Results: The mean CCT of group 1 (with removal of corneal surface fluid) were 361.3±13.9 μm preoperatively and 321.4±18.5 μm at 4 weeks postoperatively. The mean CCT of group 2 (without removal of surface fluid) were 358.7±8.9 μm preoperatively and 338.4±12.0 μm at 4 weeks postoperatively. The mean ablation depths were 39.8±7.4 μm in group 1 and 20.3±5.8 μm in group 2 at 4 weeks postoperatively (p<0.05). Conclusions: Induced corneal surface fluid during PRK may influence the ablation efficacy and accuracy of solid-state laser. This result should be considered in clinical trialswith 213-nm solid-state laser, especially in high myopes. J Korean Ophthalmol Soc 2008;49(11):1723-1728