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온열치료용 SiO<sub>2</sub>/Fe<sub>2</sub>O<sub>3</sub> 나노복합입자의 제조와 특성
유지훈,이창우,이재성,좌용호,Yu, Ji-Hun,Lee, Chang-Woo,Lee, Jai-Sung,Choa, Yong-Ho,Hofmann, Heinrich 한국재료학회 2003 한국재료학회지 Vol.13 No.9
The magnetic heating effect of $SiO_2$coated $ \Upsilon-Fe_2$$O_3$nanocomposite particle due to magnetic relaxational loss of superparamagnetic regime was investigated by measuring the generated heat from nanocomposite particles in alternative applied magnetic fields. The commercial $ \Upsilon-Fe_2$$O_3$nanoparticles were coated by SiO$_2$in water solution with TEOS and the synthesized nanocomposite powders and its magnetic properties were characterized and compared with the raw$ \Upsilon-Fe_2$$O_3$nanoparticles. The 10∼30 nm sized $ \Upsilon-Fe_2$$O_3$. nanoparticles were coated by 5 nm thickness of amorphous $SiO_2$film. The nanocomposite particle has very low Mr and Hc value showing superparamagnetic behavior The magnetic heating effect of nanocomposite particle on surface coating phase of $SiO_2$was discussed in terms of superparamagnetic behaviors of each particles, and their potential for hyperthermia application was evaluated.
볼밀링한 Bi-Te-Sb계 분말의 열전특성에 관한 연구
유지훈,배승철,하국현,김병기,이길근,Yu Ji-Hun,Bae Seung-Chul,Ha Gook-Hyun,Kim Byoung-Kee,Lee Gil-Gun 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.6
The p-type semiconductor $Bi_2Te_3-Sb_2Te_3$ thermoelectric materials were fabricated by melting, milling and sintering process and their thermoelectric properties were characterized. The compound materials were ball-milled with milling time and the powders were sintered by spark plasma sintering process. The ball milled powders had equiaxial shape and approedmately $1\~3{\mu}m$ in size. The figure of meritz of sintered thermoelectric materials decreased with milling time because of lowered electrical resistivity. The thermoelectric properties of $Bi_2Te_3-Sb_2Te_3$ materials have been discussed in terms of electrical property with ball mill process.
화학기상응축 반응기 내부의 유동해석을 통한 $TiO_2$ 나노분말의 형성과정에 관한 연구
유지훈,최철진,김용진,김병기,Yu, Ji-Hun,Choe, Cheol-Jin,Kim, Yong-Jin,Kim, Byeong-Gi 한국기계연구원 2003 硏究論文集 Vol.33 No.-
Using the residence time calculated by computer simulation for temperature and gas velocity distribution in CVC reactor, the kinetics on the formation of $TiO_2$ nano powder was analyzed for coagulation process, After abrupt increase of particle size at initial growth stage (< 0.2 $\mus$ ), the particle grew in proportion of cubic root to time. The numerically calculated particle sizes well agreed with the experimental results. However, the coarse rutile $TiO_2$ powders having the particle size of over 40 nm were formed on the surface of quratz rod in the reactor. it is thought that the fine anatase particles condensed on quratz rod were sintered in a heated CVC reactor to grow and transform to coarse rutile phase, and the critical size for phase transformation anstase-to-rutile was around 25 nm tn this study.
유지훈(Yu, Ji Hun),홍성언(Hong, Sung Eon),김윤기(Kim, Yun Ki) 한국지적학회 2013 한국지적학회지 Vol.29 No.2
본 연구에서는 지상라이다측량을 활용하여 건축문화재의 3차원 데이터를 취득하고 가공하여 역설계도면을 작성하고 현재의 정밀 실측조사방법에 의해 작성되어진 기본도면과 정확도를 비교하여 봄으로 서 지상라이다측량에 의한 건축문화재 역설계 활용의 가능성을 제시하여 보고자 하였다. 연구결과, 정확성 측면에서는 오차 범위내의 근소한 차이를 보였으나 부재별 치수대상이 아닌 단순 도면표현부분에서 지상라이다에 의한 역설계도면이 더 실제와 가깝게 나타났다. 효율성 측면은 정밀실측조사방법에 대한 구체적인 사항이 나타나지 않아 비교가 어렵지만 지상라이다 역설계는 짧은 시간에 정확한 도면을 작성할 수 있다는 결과를 도출하였다. 결과적으로 지상라이다에 의한 건축문화재의 역설계는 충분한 활용적 측면을 가지고 있다고 판단되었다. The primary purpose of this research was to acquire the 3 dimensional data for architectural heritage utilizing Terrestrial LiDAR survey and produce the reverse design map. In addition, authors tried to suggest the applicability of Terrestrial LiDAR survey in the field of architectural heritage preservation by comparing the accuracy of the reverse design map and that of the existing map which was produced by using current surveying method. Our study results showed that there was a little difference between the reverse design map and the existing map, which was within the range of an error tolerance. In terms of visualizing architectural heritage, the reverse design map seemed to be closer to the reality. It was difficult to compare the efficiency of two maps because there were not any detailed descriptions for precise actual survey methods. However, the Terrestrial LiDAR survey was turned out to be more time-efficient than the existing survey method. It was concluded that the reverse design of architectural heritage based on the Terrestrial LiDAR survey results seemed to have lots of applicability in the field of heritage preservation.
기관내 내독소 투여로 유도한 백서의 급성 폐손상 모델에서 surfactant가 호중구의 아포토시스에 미치는 영향
유지훈 ( Yu Ji Hun ),이병준 ( Lee Byeong Jun ),정도영 ( Jeong Do Yeong ),이상훈 ( Lee Sang Hun ),신종욱 ( Sin Jong Ug ),김재열 ( Kim Jae Yeol ),박인원 ( Park In Won ),최병휘 ( Choe Byeong Hwi ) 대한결핵 및 호흡기학회 2002 Tuberculosis and Respiratory Diseases Vol.53 No.4