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Mist-CVD법으로 증착된 다결정 산화갈륨 박막의 MOSFET 소자 특성 연구
서동현,김용현,신윤지,이명현,정성민,배시영,Seo, Dong-Hyun,Kim, Yong-Hyeon,Shin, Yun-Ji,Lee, Myung-Hyun,Jeong, Seong-Min,Bae, Si-Young 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.5
In this research, we evaluated the electrical properties of polycrystalline-gallium-oxIde (Ga<sub>2</sub>O<sub>3</sub>) thin films grown by mist-CVD. A 500~800 nm-thick Ga<sub>2</sub>O<sub>3</sub> film was used as a channel in a fabricated bottom-gate MOSFET device. The phase stability of the β-phase Ga<sub>2</sub>O<sub>3</sub> layer was enhanced by an annealing treatment. A Ti/Al metal stack served as source and drain electrodes. Maximum drain current (I<sub>D</sub>) exceeded 1 mA at a drain voltage (V<sub>D</sub>) of 20 V. Electron mobility of the β-Ga<sub>2</sub>O<sub>3</sub> channel was determined from maximum transconductance (g<sub>m</sub>), as approximately, 1.39 ㎠/Vs. Reasonable device characteristics were demonstrated, from measurement of drain current-gate voltage, for mist-CVD-grown Ga<sub>2</sub>O<sub>3</sub> thin films.
동통을 동반한 제2 중족 족지 관절 불안정성의 치료경험 - 1예 보고 -
서동현,박용욱,김도영,이상수,서영진,박현철,강승완,Suh, Dong-Hyun,Park, Yong-Wook,Kim, Do-Young,Lee, Sang-Soo,Seo, Young-Jin,Park, Hyun-Chul,Kang, Seung-Wan 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.2
An unstable second metatarsophalangeal joint may produce pain in the forefoot. Plication of stretched lateral ligament and capsule and transfer of the extensor digitorum brevis under the transverse intermetatarsal ligament performed as the primary procedure to stabilize this painful joint. But the pain was not subsided and the proximal phalanx was resubluxated. So, we osteotomized the second metatarsal to restore a normal alignment of the second toe. Then the symptom was subsided. We report a case of painful instability of the metatarsophalangeal joint of the second toe.
지혜 깊어지는 건강 - 40대를 지켜라 - 통풍 환자는 바람만 불어도 엄지발가락이 아프다
서동현,Seo, Dong-Hyeon 한국건강관리협회 2011 건강소식 Vol.35 No.2
엄지발가락이 따끔거리더니 시간이 지날수록 심한 통증이 찾아와 밤에 잠을 잘 수 없는 고통을 겪는 40대가 많다. 한참 사회생활이 활발한 40대의 특성상 술자리가 많고 외근도 잦아 걷는 일이 다반사인데 신발을 신지 못할 정도의 심각한 통증으로 업무에 지장이 생겨 참다못해 병원에 방문하면 혈액검사를 비롯한 검진을 통해 급성 통풍암을 알게 된다.
알칼리 활성화 모르타르의 메타카올린 치환율에 따른 특성
서동현,형원길,Seo, Dong-Hyeon,Hyung, Won-Gil 한국건축시공학회 2016 한국건축시공학회지 Vol.10 No.4
The aim of this study is to look into the metakaolin replacement ratio of blast furnace slag based alkali activated slag mortar and its mechanical characteristics according to changes in stimulant concentration. Metakaolin has high fineness, and therefore the fluidity becomes lower as the replacement ratio becomes higher. So in this study, a sufficient value of mixing water was provided to secure fluidity for the characteristic experiment, and a different W/B was derived for each specimen in order to make the fluidity identical. A characteristic experiment was conducted according to the mol concentration of NaOH, which was used as the mixing water that affects fluidity. Additionally, compressive strength measurement, observation of inner microstructure through SEM, acid resistance experiment, and neutralization resistance was conducted. The results of this study revealed that for a high concentration NaOH solution to have even fluidity, a high W/B is necessary, and the functions were enhanced, not degraded. 본 연구의 목적은 고로슬래그 베이스 AAS 모르타르의 메타카올린 치환율과 자극제 농도의 변화에 따른 역학적 특성과 내구성에 대하여 알아보는 것이다. 메타카올린은 분말도가 높아서 치환율이 높아질수록 유동성이 많이 저하되기 때문에 본 연구에서는 충분한 NaOH 수용액를 가하여 시공성을 확보한 상태에 실험을 진행하였다. 따라서 모든 시험체의 시공성을 동일하게 하는 각기 다른 Ws/B를 도출하였고, 이에 따라 시공성에 영향을 미치는 NaOH 수용액의 몰 농도별 특성에 대한 실험을 진행하였다. 또한 압축강도 측정실험, SEM을 통한 내부 미세구조 관찰, 내산성 실험 실험을 진행하였다. 본 연구 결과 메타카올린 치환율이 높은 배합은 Ww가 많이 필요로 하였지만, 그에 따른 성능 저하는 나타나지 않으며 오히려 우수한 역학적 내구적 성능을 보여주었다. 또한 [6M]보다 [8M]농도의 NaOH 자극제를 사용했을 때 메타카올린 치환 효과가 극대화 되었다.
무지 외반증 치료로 사용된 제1 중족골 근위 반월형 절골술 후 발생한 제1 중족골 족배측 각형성 정도
서동현,박용욱,김도영,이상수,서영진,박현철,강승완,Suh, Dong-Hyun,Park, Yong-Wook,Kim, Do-Young,Lee, Sang-Soo,Seo, Young-Jin,Park, Hyun-Chul,Kang, Seung-Wan 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.2
Purpose: We try to retrospectively evaluated the amount of dorsal angulation angle of the first metatarsal commonly occurring as the complication of proximal dome osteotomy for hallux valgus. Materials and Methods: Between January 2004 and March 2004, 34 patients who underwent proximal dome osteotomy for moderate to severe hallux valgus. Two of 34 patients were male, and thirty-two were female. The average age was 57.6 years. We measured and compared hallux valgus angle, 1st-2nd intermetatarsal angle, dorsal angulation angle of 1st metatarsal on preoperative, postoperative, postoperative 3 weeks', postoperative 3 months' X-ray. Results: Osteotomy sites were completely united on plane X-ray in all cases. The hallux valgus angle averaged $41.2^{\circ}$ ($30{\sim}60^{\circ}$) at preoperative, $4.3^{\circ}$ ($-10{\sim}20^{\circ}$) at postoperative, $5.5^{\circ}$ ($-1{\sim}20^{\circ}$) at 3 weeks after operation, $7.8^{\circ}$ ($-2{\sim}20^{\circ}$) at 3 months after operation. The 1st-2nd intermetatarsal angle averaged $17.1^{\circ}$ ($12{\sim}24^{\circ}$) at preoperative, $6.3^{\circ}$ ($0{\sim}13^{\circ}$) at postoperative, $7.2^{\circ}$ ($0{\sim}15^{\circ}$) at 3 weeks after operation, $8.7^{\circ}$ ($0{\sim}18^{\circ}$) at 3 months after operation. The dorsal angulation angle averaged $0.4^{\circ}$ ($0{\sim}3^{\circ}$) at postoperative, $1.6^{\circ}$ ($0{\sim}7^{\circ}$) at 3 weeks after operation, $2.1^{\circ}$ ($0{\sim}8^{\circ}$) at 3 months after operation. There were no statistically correlation between increase of dorsal angulation angle of the distal segment of the first metatarsal and increase of hallux valgus angle or 1st-2nd intermetatarsal angle. Conclusion: Our results shows that the dorsal angulation of distal fragment occurring after the proximal dome osteotomy in the treatment of hallux valgus may be minimized with meticulous surgery and patient's education.
AcciMap, STAMP, FRAM을 이용한 반응기 세척 작업 중 화재 사고 분석
서동현,배계완,최이락,한우섭,Seo, Dong-Hyun,Bae, Gye wan,Choi, Yi-Rac,Han, Ou-Sup 한국안전학회 2021 한국안전학회지 Vol.36 No.4
Representative systematic accident analysis methods proposed so far include AcciMap, STAMP, and FRAM. This study used these three techniques to analyze a fire accident case that occurred during routine manufacturing work in a domestic chemical plant and compared the results. The methods used different approaches to identify the cause of the accident, but they all highlighted similar causal factors. In addition to technical issues, the three accident analysis methods identified factors related to safety education, risk assessment, and the operation of the process safety management system, as well as management philosophy and company culture as problems. The AcciMap and STAMP models play complementary roles because they use hierarchical structures, while FRAM is more effective in analyses centered on human and organizational functions than in technical analyses.