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송현우,최철,최경식,오제명,Song Hyunwoo,Choi Cheol,Choi Kyungshik,Oh Jemyung 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
Two different nanofluids were prepared by dispersing $Al_{2}O_3$ nanoparticles in transformer oil after hydrophobic surface modification. The agglomerated alumina nanoparticles with diameters from ${\mu}m$ to mm were ball-milled and then treated with surfactants such as lauric acid, stearic acid and oleic acid. The surface characteristics of modified nanoparticles were examined by FTIR spectroscopy. It showed that the hydrophobicity of nanoparticles was caused by esterification between hydroxyl groups on the particle surface and functional groups of surfactant. The shape and size distribution of ball-milled particles were analyzed by TEM and PSA. The results compared with the primary particles indicated that the size distributions of nanoparticles were dependant on milling times. The dispersion stability of modified nanoparticles dispersed in oil was highly dependent on the composition and amounts of surfactants.
하악 상행지부에 발생한 치성각화낭의 시상 분할 골절단술을 이용한 치험례
송현우,류동목,김여갑,이백수,권용대,최병준,김영란,임진혁,이정교,Song, Hyun-Woo,Ryu, Dong-Mok,Kim, Yeo-Gab,Lee, Baek-Soo,Kwon, Young-Dae,Choi, Byung-Jun,Kim, Young-Ran,Yim, Jin-Hyuk,Lee, Jung-Gyo 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Odontogenic keratocyst (OKC) is a epithelial developmental cyst which were first described by Phillipsen in 1956. The frequency of OKC has been reported to vary from 3% to 11% of odontogenic cysts. The most characteristic clinical aspect of OKC is the high frequency of recurrence. The mechanism of recurrence is thought to be related to residues of cyst epithelium and an intrinsic growth potential following excision. And since the lining of the OKC is thin and friable, removal of the cyst in one piece may sometimes be difficult. Complete removal of the cyst lining without leaving behind remnants attached to the soft tissue or bone is necessary to avoid recurrence. Therapeutic approaches vary in different studies from marsupialization and enucleation, which may be combined with adjuvant therapy such as cryotherapy or Carnoy's solution, to marginal or radical resection. The recurrent rate varies from approximately 20% to 62%. And OKC in the angle-ramus region of the mandible had a higher tendency to recur, because of the difficulty in accessing and removing OKC from the ramus. By employing a sagittal splitting of the mandible a good surgical access was provided and cyst could be removed completely. We present an illustrative case of a small, lobulated OKC that involved ramus on mandible, and a review of the contemporary literature.
순환경제 관점의 국내 자원순환 정책분석 : 2018 ~ 2020년 5개 정책을 대상으로
송현우,배정윤,한인섭 한국도시환경학회 2022 한국도시환경학회지 Vol.22 No.2
The purpose of this study is to compare the domestic resource circulation policy announced in 2018-2020 and the EU's environmental policy, circular economy policy, to be used as a basis for future policy alternatives. To this end, main keywords were derived from the four policies announced by the EU in 2014, 2015, 2018, and 2020, and these were composed of policy goals (Lv1), core strategies (Lv2), and monitoring (Lv3). This study analyzes the five domestic resource circulation policies from the perspective of the circular economy policy. As a result, in the case of the “1st Master Plan for Resource Circulation,” which was the highest level plan in the field of resource circulation, it was confirmed that it was a policy at a level quite similar to that of the EU policy, with a score of 90 based on 100 points of EU circular economy policy. 본 연구는 2018~2020년에 발표한 국내 자원순환 정책이 EU의 환경정책인 순환경제 정책과 비교하고 , 향후 정책대안 을 구성함에 있어 근거자료로 활용되는 것을 목적으로 한다 . 이를 위해 EU가 2014년, 2015년, 2018년, 2020년 발표한 4 개의 정책을 대상으로 주요 키워드를 도출하고 , 이를 정책목표 (Lv1), 핵심전략 (Lv2), 모니터링 (Lv3)으로 구성하여 EU의 순환경제 정책 관점에서 5개의 국내 자원순환 정책을 분석한다 . 그 결과 자원순환 분야 최상위 계획인「제1차 자원순환 기본계획 」 의 경우 EU 순환경제 정책을 100점으로 기준했을 때, 90점으로 EU와 상당히 유사한 수준의 정책임을 확인 하였다 .
Graphene Gas Sensor Array Functionalized with Container Molecules
송현우,박철희,이윤호,오준학 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The conventional "lock-and-key" sensor system has a disadvantage of low accuracy and reliability due to the limitation of detecting performance for single analyte. In this study, a pattern recognition type organic electronic device sensor array was manufactured by introducing container molecules such as cyclodextrins and calixarenes. It was confirmed that the sensor array with various container molecules shows different current changes for several analytes. This study not only provides an effective strategy for manufacturing a high-sensitivity, large-area sensor array, but shows that the pattern recognition sensor array can be applied to IoT and healthcare devices.
송현우,한원석,Song, H.W.,Han, W.S. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.6
반도체 산업의 눈부신 발전은 진공관을 대신할 다이오드와 트랜지스터를 발명함으로써 저전력, 소형화에 성공하였기 때문이며, 또한, IC의 발명으로 이를 집적화하여 대량생산이 가능하고, 제품 제작을 용이하게 함으로써 제품 제작가격을 낮출 수 있게 되었기 때문이다. 이와 마찬가지로 가스 레이저를 대신할 반도체 레이저의 발명은 광통신의 핵심 부품인 광원의 저전력, 소형화를 실현시킴으로써 광통신 시대를 열게 하였다. 반도체 레이저의 발명으로 저전력, 소형화에는 성공하였으나, 비싼 광통신 부품은 본격적인 광통신 시대 실현에 걸림돌이 되고 있다. 반도체 산업의 주역인 IC 칩과 같은 저전력이며, 집적화가 가능하고, 대량 생산이 용이하여 가격이 저렴한 광 부품이 필요하다. 이런 이유로 광 부품 중 핵심 기술인 광원에 있어서는 표면방출레이저(VCSEL)가주목 받고 있다. 본 고에서는 각 파장 대역별로 표면방출레이저 소자의 기술 및 현황을 설명하고, 이들의 다양한 응용 분야 그리고 현재의 표면방출레이저 소자 시장 동향을 살펴 본다.