http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
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
김관수(Kim Kwan-Soo) 한국동서경제학회 2005 한국동서경제연구 Vol.17 No.1
지식기반경제에서 경제주체들의 의식과 시장경제 제도는 과거보다 더욱 긴밀한 관계를 가진다. 즉, 독과점시장에서 독점적 경쟁시장으로의 이행이 촉진됨에 따라 경제주체들의 합리성과 윤리성이 투철하지 않은 곳에서는 시장경제가 효율적인 기능을 發揮할 수 없게 되고, 결과적으로 지식기반경제로의 경제구조 조정도 원만히 이루어 질 수 없다. 따라서 지식기반사회에서의 경제교육은 내용면에서 사회변화에 부응하는 인지교육과 함께 정의교육이 강화되어야 하며, 방법면에서는 가정-학교-사회의 연계교육과 함께 정보매체 활용교육이 강화될 것이 요망된다. 특히 지식기반사회는 공정한 경쟁의 촉진과 함께 상호간의 신용과 통합을 전제하므로 입시제도의 개혁과 함께 경제주체들의 건전한 가치관 형성을 위한 정의적인 교육에 역점이 두어 져야 할 것이다. 산업사회에서는 시장경제를 창달하기 위한 경제교육이 주로 경제주체간 경쟁만을 강조하고 신용과 통합 등은 소홀히 취급하였기 때문이다. 정의적인 경제교육은 청소년들이 가정 및 사회에서 보고, 듣고, 생활하는 가운데 체험적으로 이루어져 가는 것이므로 국민전체의 의식 및 행태 변화가 수반되어야 소기의 성과를 거둘 것으로 판단된다. This paper suggests a mathod to solve issues on the economic education in the knowledge-based society. The new economic phenomena are characterized in 3 respects; economic theory, structure, mind and behavior. Nowadays, the major issues faced by Korea are summarized in 3 respects; inappropriate and inefficient social system, inefficient investment and education. In the knowledge-based society, the reform of contents and methods in economic education seems to be necessary to overcome the widespread pariah capitalism in korea, even though there exists big gap between the traditional religion and culture in korea and the christian culture in western Europe, especially in the respect of spirit and thought.
김관수 ( Kwan Soo Kim ),이완석 ( Wan Sok Lee ),홍명호 ( Myung Ho Hong ),차경옥 ( Kyung Ok Cha ) 대한내과학회 1968 대한내과학회지 Vol.11 No.11
A blood culture is a routine examination in febrile diseases due to the systemic infection and it is described that a positive culture is usually obtained by careful, appropriate and repeated culture. However since authors noticed recently a very low incid