http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
김관수,윤상옥,심상흥,박종국,Kim, Kwan-Soo,Yoon, Sang-Ok,Shim, Sang-Heung,Park, Jong-Guk 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.1
The effects of $B_2O_3-SiO_2-R(R;CaO,\;BaO,\;ZnO,\;Bi_2O_3)$ borosilicate glass system on the sintering behavior and microwave dielectric properties of ceramic/glass composites were investigated as functions of modifier, glass addition ($30{\sim}50\;vol%$) and sintering temperature ($500{\sim}900^{\circ}C$ for 2 hrs). The addition of 50 and 45 vol% glass ensured successful sintering below $900^{\circ}C$. Sintering characteristics of the composites were well described in terms of modifier. Borosilicate glass enhanced the reaction with $Al_{2}O_{3}$ to form pores, second phases and liquid phases, which was responsible to component of modifier. Dielectric constant (${\varepsilon}_{r},\;Q{\times}f_{o}$) and temperature coefficient of resonant frequency (${\tau}_{f}$) of the composite with 50 and 45 vol% glass contents($B_{2}O_{3}:SiO_{2}:R=25:10:65$) demonstrated A-CaBS(7.8, 2,560 GHz, -81ppm/$^{\circ}C$), A-BaBs(5.8, 3.130 GHz, -64 ppm/$^{\circ}C$), A-ZnBS(5.7, 17,800 GHz, -21 ppm/$^{\circ}C$), A-BiBs(45 vol% glass in total)(8.3, 2,700 GHz, -45 ppm/$^{\circ}C$) which is applicable to substrate requiring an low dielectric properties.
김관수,최철영,장혜란,Kwan Soo Kim,M,D,Chul Young Choi,M,D,Hae Ran Chang,M,D 대한안과학회 2008 대한안과학회지 Vol.49 No.12
Purpose: A number of patients with accommodative esotropia who were initially well controlled with their optical correction will deteriorate. This study aims to examine the cautious clinical features of patients with accommodative esotropia during follow-up period by obtaining the prevalence and the predictive factors of deterioration in accommodative esotropia. Methods: The records of 89 patients with accommodative esotropia whose eyes were aligned with optical correction (including bifocals) to 8 prism diopters (PD) of esotropia or less were reviewed. All patients were followed for a period of at least 2 years. The patients whose alignment was increased to 10PD of esotropia or greater during the follow-up period were included into the deteriorated group. We obtained the rate of deterioration and compared the clinical features of the deteriorated and controlled group. Results: The mean follow-up period was 64.1±29.3 months. Seven (7.8%) of 89 patients was deteriorated. The mean interval of deterioration after initial optical correction was 41.8±26.9 months. The stereopsis was significantly worse in the deteriorated group p=0.024). The frequency of high AC/A ratio was also significantly higher in the deteriorated group (p=0.003). Conclusions: This study indicates that accommodative esotropia with high AC/A ratio or worse sensory status has an increased likelihood of deterioration.
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
金寬洙(Kim Kwan Soo) 전남대학교 글로벌디아스포라연구소 2011 전남대학교 세계한상문화연구단 국제학술회의 Vol.2011 No.2
With the procedure of ordering, the budget gets made and distributed. Discharging has to be discussed. Should not be only concentrated with the appearances, something that fills the convention is more important. If the overseas museum gets provided with amount of building costs they don’t require, it will probably be isolated by the visitors due to the shortage of softwares. on this, I would like to make an analysis with the trends of visitors and the museum it self, so the Yeo-su Expo’s optimization budget with the use of subtitled halls can be made.