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금 격자-그래핀 하이브리드 구조 기반의 투명 전극 응용 연구
황순휘(Soonhwi Hwang),강준모,최성,박영철,이덕진,최재붕 (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
최근 그래핀의 높은 광학적, 전기적 특성을 이용하여 투명전극으로 응용하는 연구가 진행되고 있다. 본 연구에서는 화학 기상 증착법을 통하여 그래핀을 합성하고, 금 격자 패터닝과 AuCl3-CH3NO2 도펀트를 이용하여 그래핀의 면저항을 개선하였다. 금 격자-그래핀의 하이브리드 구조는 8 Ω/□ 면저항 특성을 나타내었으며, 이는 기존의 그래핀 한층 면저항 값인 350 Ω/□ 보다 매우 낮은 값을 나타내었다. 또한 그래핀의 적층과 화학적 도핑을 통해 추가적으로 6 Ω/□ 수준의 면저항 값을 확인하였다. 이를 통하여 낮은 면저항을 요구하는 투명 전극 분야에 그래핀-금 격자 하이브리드 구조를 적용 가능할 것으로 예상한다.
황순휘(Sun-Hwi Hwang),박도중(Do Joong Park),박영수(Young Soo Park),이경호(Kyoung Ho Lee),김영훈(Young Hoon Kim),이혜승(Hye Seung Lee),이혁준(Hyuk-Joon Lee),김형호(Hyung-Ho Kim),양한광(Han-Kwang Yang),이건욱(Kuhn Uk Lee) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.5
Liposarcoma is a mesenchymal malignant tumor which occurs most frequently in the limbs, retroperitoneum, and trunk: Although primary liposarcoma may occur anywhere adipose tissue is found, visceral locations are only rarely represented. Moreover, primary gastric liposarcoma is extremely rare. So, only a few cases of primary gastric liposarcoma have been reported in English literature. We describe the case of a 43-year-old woman presenting with melena, epigastric pain, general weakness. Esophagogastroduodenoscopy (EGD) showed a 6×4×3 ㎝ sized-mass which was located on the posterior gastric wall. By endoscopic ultrasonography and abdominal CT scan, we suspected gastric lipoma and performed the laparoscopic transgastric tumor resection by eversion method. Finally, it was confirmed as a gastric liposarcoma pathologically. Herein, we present a case of gastric liposarcoma which was resected by laparoscopic transgastric wedge resection.
위암수술 환자에서의 cp 개발과 cp적용에 따른 질 향상 활동에 관한 연구
임은주,황순휘,박도중,하광일,배현주,김형호 한국의료QA학회 2006 한국의료질향상학회지 Vol.13 No.2
Background : In an era of increasing medical costs, safe reduction in postoperative stay has become a major focus to optimize utilization of healthcare resources. The authors aimed to evaluate the clinical significance of the critical pathway(CP) for gastrectomy patients by implementing standardized postoperative management and electronic medical records. Method : From August 2006 to April 2007, critical pathways were introduced to inpatients and outpatients with gastric cancer. 60 consecutive patients undergoing distal gastrectomy were randomly divided into two groups; 30 CP group(A) and 30 non-CP group(B). Simultaneously, we also retrospectively reviewed the records of 438 patients(C:control group) who were able to be enrolled in CP program. We compared group(A) with (B), (C) in terms of hospital stay, complication rate, use of antibiotics and hospital costs. Patient satisfaction was surveyed by questionnaires. Result : There was no significant demographic difference between group(A) and (B). Of 30 patients in group(A), 5 drop-outs and 14 variances occurred. The mean postoperative hospital stays(Laparoscopy-assisted distal gastrectomy: LADG/Open distal gastrectomy: ODG) were 7.6/10.5 days for the group(A), 8.9/12.7 days for the group(B) and 12.6/14.5 days for the group(C) (p=0.02 in LADG). The total hospital cost of group(A) had a tendency to be less than that of group(B) and the amount of hospital cost per day in group(A) was significantly higher than that in group(B). The usage rates of the first generation antibiotics were 73.33%, 63.33%, and 59.2% in group(A), (B), and (C), respectively. Patients’ satisfaction had a tendency to be higher in the CP group than non-CP group. Conclusion : The mean hospital stay in LADG patients was shortened meaningfully and hospital cost per day was enlarged after introduction of clinical pathway. It is necessary to apply a number of patients to the critical pathway and to make an effort to reduce the variation and drop-out rates.
김태균,황순휘,박인규,양환석,이정환,이광현 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.6
Equipment that uses a high-power laser is continuously being improved and applied to various fields. The high-power laser beam is transmitted through the equipment's optical system. Unfortunately, the optical system is heated by the reflected and transmitted beam, which decreases its performance. Therefore, it is important to design a beam dumper that effectively reduces unnecessary beams. In this study, we designed a beam dumper for a high-power laser and analyzed its performance through modeling and simulation. We also conducted an experiment that measured the reflected energy using a photodetector. 고출력 레이저를 기반으로 하는 장비는 지속적으로 발달되고 다양한 분야에 적용되고 있다. 고출력 레이저 빔은 장비 내에서 광학계를 통해 빔이 전송된다. 반사 또는 투과된 빔에 의해 주변 광학부는 열을 흡수하게 되고, 흡수된 열로 인해 광학부는 성능이 저하된다. 따라서 불필요한 레이저 빔을 효율적으로 제거하기 위한 부품인 빔 덤퍼를 M&S를 통해 성능 검증하는 것은 매우 중요하다. 본 논문에서는 고출력 레이저용 빔 덤퍼에 대해 설계 및 성능을 분석하고, 이를 바탕으로 제작한 빔 덤퍼에 고출력 레이저를 입사시켜 되 반사 에너지를 photo detector로 측정하여 성능을 실험적으로 검증하였다.