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김상훈,Kim, Sang-Hun 환경보전협회 2014 환경정보 Vol.412 No.-
인간의 생물 서식지 파괴, 환경오염, 외래종 도입 등은 지구 곳곳에서 생물종의 멸종을 야기하며 생물다양성에 큰 위협이 되고 있다. 이러한 상황이 지속되면 생태계 자체의 파괴는 물론이고, 궁극적으로 인간의 생존 기반을 위협하게 된다. 국제사회는 생물다양성의 보전과 지속 가능한 이용을 위해 올 9월 대한민국에 모인다.
김상훈,방몽숙,양홍서,박상원,박하옥,임현필,오계정,Kim, Sang-Hun,Vang, Mong-Sook,Yang, Hong-So,Park, Sang-Won,Park, Ha-Ok,Lim, Hyun-Pil,Oh, Gye-Jeong 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.2
Statement of problem: Titanium has many advantages of high biocompatibility, physical properties, low-weight, low price and radiolucency, but it is incompatible with conventional dental porcelain due to titanium's oxidative nature. Many previous studies have shown that they used the method of sandblast for surface treatment prior to porcelain application, the researches are processing about the method of acid etching or surface coating. Purpose: The purpose of this research is to study the effect on bond strength of surface roughness between titanium and porcelain with the same surface topography. Material and method: In this study, we evaluated the bond strength by using 3-point bending test based on ISO 9693 after classified 8 groups - group P : polished with #1200 grit SiC paper, group S10 : $1.0{\mu}m$ surface roughness with sandblasting, group S15 : $1.5{\mu}m$ surface roughness with sandblasting, group S20 : $2.0{\mu}m$ surface roughness with sandblasting, group S25 : $2.5{\mu}m$ surface roughness with sandblasting, group S30 : $3.0{\mu}m$ surface roughness with sandblasting, group S35 : $3.5{\mu}m$ surface roughness with sandblasting, group E : $1.0{\mu}m$ surface roughness with HCl etching. Results: Within the confines of our research, the following results can be deduced. 1. In the results of 3-point bending test, the bond strength of sandblasting group showed significant differences from one of polishing group, acid etching group(P<.05). 2. The bond strength of sandblasting groups did not show significant differences. 3. After surface treatments, the group treated with sandblasting showed irregular aspect formed many undercuts, in the SEM photographs. The bond strength of sandblasting group was higher than 25 MPa, the requirement of ISO 9693. Conclusion: In above results, bond strength of titanium and low-fusing porcelain is influenced more to surface aspect than surface roughness. And titanium has clinically acceptable bond strength below surface roughness of $3.5{\mu}m$.
LAS (β-spodumene)와 Fe<sub>2</sub>O<sub>3</sub> 첨가에 따른 Al<sub>2</sub>TiO<sub>5</sub>의 소결체 특성 연구
김상훈,강은태,김응수,황광택,조우석,Kim, Sang-Hun,Kang, Eun-Tae,Kim, Ung-Soo,Hwang, Kwang-Taek,Cho, Woo-Seok 한국결정성장학회 2012 韓國結晶成長學會誌 Vol.22 No.1
$Al_2TiO_5$에 LAS(${\beta}$-spodumene)와 $Fe_2O_3$를 첨가하여 고상법으로 세라믹 소결체를 제조하였다. $Al_2TiO_5$에 첨가된 LAS는 액상을 형성하고, $Fe_2O_3$는 입자 성장을 억제시켜 소결체를 치밀화하였다. 첨가제의 양을 변화시켜 소결특성, 기계적 특성 및 열충격 특성에 대하여 조사하였다. $Fe_2O_3$가 20 wt% 첨가된 LAS를 $Al_2TiO_5$에 20 wt% 첨가하였을 때, 꺽임 강도는 120 MPa 이상이었고, 열충격에 대한 저항성은 $1200^{\circ}C$ 이상으로 우수함을 확인하였다. $Al_2TiO_5$ ceramics were sintered by a solid-state reaction. LAS (${\beta}$-spodumene) and $Fe_2O_3$ were added to the $Al_2TiO_5$ composition for enhancement of sintering behavior such as mechanical strength and thermal shock resistance. The sintered body was much densified by addition of LAS and $Fe_2O_3$ because LAS formed the liquid-phase and $Fe_2O_3$ suppressed the grain growth. We have systematically investigated the sintering characteristics, microstructures, mechanical properties, and thermal shock resistance according to the change of the amount of additive. When the additive of LAS (20 wt%)-$Fe_2O_3$ was added to $Al_2TiO_5$, it confirmed that superior mechanical properties of the fracture strength of over 120 MPa and the thermal shock resistance of over $1,200^{\circ}C$ were achieved.
내가 다닌 대학ㆍ학과(5) - 미국/노스다코다주립대학 분자생물학과, 사회에 미치는 영향 고려 철저한 교육
김상훈,Kim, Sang-Hun 한국과학기술단체총연합회 2002 과학과 기술 Vol.35 No.7
미국 노스다코다주립대학은 한명의 학생을 배출하는데 있어서도 그 학생이 사회에 나가 미치는 영향을 고려하여 철저하게 교육시키는 자세와 이를 위한 효율적인 학교시스템을 운영하고 있다.