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Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub> 형광체의 합성과 발광특성
한상혁,김영진,Han Sang Hyuk,Kim Young Jin 한국재료학회 2004 한국재료학회지 Vol.14 No.8
$Sr_{4}Al_{14}O_{25}$ was synthesized by solid state reaction with flux. $H_{3}BO_3$ was used to synthesize $SrO-Al_{2}O_{3}$ phosphor system as a flux. The effect of doping system such as Eu+Dy, Eu, and Ce on the luminescent properties of $Sr_{4}Al_{14}O_{25}$ was investigated. Both PL spectra of $Sr_{4}Al_{14}O_{25}$:Eu and $Sr_{4}Al_{14}O_{25}$:Eu+Dy excited at 390 nm showed greenish-blue emission at about 490 nm, while the emission wavelength was shifted to 400 nm by doping Ce. The reduction of $Eu^{3+}$ ions to $Eu^{2+}$ could be accomplished by the annealing process under $N_{2}^{+}$ vacuum atmosphere, and attributed to the emission at 490 nm. It is verified that $Sr_{4}Al_{14}O_{25}$:Eu phosphor is suitable for white LEDs became of a broad absorption band peaking at 390 nm.
생체 유래 골 이식재(OCS-B)의 안전성 및 유효성에 관한 연구
박호남,한상혁,김경화,이상철,박윤정,이상훈,김태일,설양조,구영,류인철,한수부,정종평,Park, Ho-Nam,Han, Sang-Hyuk,Kim, Kyoung-Hwa,Lee, Sang-Chul,Park, Yoon-Jeong,Lee, Sang-Hoon,Kim, Tae-Il,Seol, Yang-Jo,Ku, Young,Rhyu, In-Chul,Han, Soo-Boo 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.2
Inorganic bovine bone mineral has been widely researched as bone substitution materials in orthopedic and oral and maxillofacial application. OCS-B(NIBEC, Korea) is newly-developed inorganic bovine bone mineral. The aim of this study is to evaluate the safety and efficacy of bovine bone-derived bone graft material(OCS-B). Micro-structure of newly-developed inorganic bovine bone mineral(OCS-B) was analyzed by scanning electron microscope(SEM). Round cranial defects with eight mm diameter were made and filled with OCS-B in rabbits. OCS-B was inserted into femoral quadrant muscle in mouse. In scanning electron microscope, OCS-B was equal to natural hydroxyapatite. Rabbits were sacrificed at 2 weeks and 4 weeks after surgery and mice were sacrificed at 1 week and 2 weeks after surgery. Decalcified specimens were prepared and observed by microscope. In calvarial defects, osteoid and new bone were formed in the neighborhood of OCS-B at 2 weeks after surgery. And at 4 weeks after surgery osteoid and new bone bridge formed flourishingly. No inflammatory cells were seen on the surface of OCS-B at 1 week and 2 weeks in mouse experimental group. It is concluded that newly-developed inorganic bovine bone mineral(OCS-B) is a flourishing bone-forming material and biocompatible material.
강상욱(Kang, Sang-Wook),한상혁(Han, Sang-Hyuk),공현철(Gong, Hyun-Chul),최기혁(Choi, Gi-Hyuk) 한국항공우주연구원 2013 항공우주산업기술동향 Vol.11 No.2
교육적 목적으로 탄생한 큐브위성이 다양한 과학적 임무를 수행함에 따라 전세계적으로 큐브위성 경연대회 프로그램들이 성황리에 개최되고 있으며 관심 또한 매우 높다. 우리나라도 2012년 첫 큐브위성 경연대회를 시작으로 2년째 경연대회를 진행 중에 있으며, 지금까지 매년 3팀씩 총 6팀을 선정하였다. 선정된 팀들은 제작비용과 발사기회를 제공받을 예정이다. 본 논문에서는 큐브위성 경연대회의 선정기준 및 절차, 최종 선정된 6개팀의 과학임무와 시스템 특징에 관해 소개하였다. 큐브위성은 전자산업의 비약적 발전으로 인해 소형임에도 불구하고 뛰어난 과학적 임무수행능력을 보여주고 있다. 매년 큐브위성과 관련된 국제학회가 다수 열리고 있으며, 지구관측, 우주환경, 신기술 개발 및 검증 등의 분야로 응용범위가 점점 확대되고 있다. 앞으로 큐브위성 경연대회를 통해 우주개발에 대한 국민적 관심 증대와 우수한 우주관련 전문가들이 많이 양성되기를 희망해본다. CubeSat contest programs have being held with great success all over the world and received a high attention as CubeSats developed for educational purpose have carried out various scientific missions in space. The first CubeSat contest program was started in Korea in 2012 and lasted during 2 years and now a total of 6 teams were finally selected by choosing 3 teams every year until now. The finally selected teams will be supported with funding for development of CubeSat and opportunity for launch to space. In this paper, selection criteria, process for CubeSat contest program , scientific mission and system characteristics of the finally selected 6 teams are introduced. CubeSat has showed the remarkable scientific mission capability although CubeSat is small mass and small size because of nowadays MEMS electronic technology. Many international workshops related CubeSat are hosted annually in the world and discussed for application to the field of earth observation, space environment, new technology development and verification. In the future, it is expected that people"s attention to space development will be increased and many experts will be brought up through CubeSat contest program hosted in Korea.
언리얼 엔진을 기반한 비대면 다중접속 프로토타이핑 및 BIM 시뮬레이션 플랫폼 구현 - 건축물의 시각화 및 냉방부하 계산을 중심으로
김태헌(Kim Tae Heon),한상혁(Han Sang Hyuk),홍기윤(Hong ki yoon),임준원(Lim Jun Won),공병찬(Gong Byoung Chan),김상진(Kim Sang Jin) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.6
현대 사회에서 프로덕트의 기획 및 개발 과정에서 Mockup을 활용한 모델링 단계가 중요한 이슈로 등장하고 있다. 이러한 프로토타이핑 단계는 사람들이 대면해서 목표에 대한 회의를 하는 것이 보편적이나 코로나 19 펜데믹 발발로 비대면 사회가 되면서 산업의 핵심 과정인 프로덕트 프로토타이핑에 큰 차질이 생겼다. 본 논문은 보편적인 무료 게임 엔진인 언리얼 엔진을 통해 프로덕트의 실시간 사실적 시각화를 구현하여 비대면 환경으로써도 현실감 있게 프로덕트를 표현하는 방법을 구현한다. 또한 해당 프로덕트의 다양한 정보 모델링 중 일부를 구현하고 실시간 다중접속 플랫폼 위에서 접속 중인 모두가 해당 정보 모델링에 참여할 수 있도록 하는 멀티 플랫폼을 구축하는 방안을 제시한다. In modern society, modeling steps using Mockup are emerging as an important issue in the planning and development of products. While it is common for people to have face-to-face meetings on their goals, the Corona 19 pendemic outbreak has caused major disruptions in product prototyping, a key process in the industry. This paper implements real-time realistic visualization of the product through the Unreal Engine, a universal free game engine, to realistically represent the product even as a non-face-to-face environment. We also present a plan to implement some of the various information modeling of that product and build a multi-platform that allows anyone accessing from above a real-time multi-access platform to participate in that information modeling.