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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.
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.
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.
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.
GDI 연료 펌프의 평가 모드의 개발을 위한 차량 환경에 관한 연구
서동현(Dong-Hyun Seo),신외경(Wae-Gyeong Shin),이준혁(Jun-Hyuk Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
GDI (Gasoline Direct Injection) engine is a potential next generation engine for passenger car, which reduce exhaust emission and fuel consumption. Currently, the advanced company in another country have been developing and applying this system. And also some korea company have been researching GDI high-pressure fuel pump of main component in the GDI system. To develop high performance pump of the high-pressure fuel, technique is required to apply high-strength materials, welding technology, precision control technology and reliability of each part. In addition, in order to verify the performance of the high-pressure fuel pump, evaluation mode of GDI fuel pump is required. Thus, in this study, characteristics of temperature, vibration and control technology for the GDI fuel pump were analyzed. And this study is expected to be a help to the study on evaluation mode of GDI fuel pump.
자율 주행 트랙터 시스템의 성능 향상을 위한 CAN 기반의 조향제어시스템 개발
서동현(Dong Hyun Seo),서일환(Il Hwan Seo),정선옥(Sun Ok Chung),김기대(Ki Dae Kim) 충남대학교 농업과학연구소 2010 농업과학연구 Vol.37 No.1
A steering control system based on CAN(Controller Area Network) for autonomous tractor was developed to reduce duty of a central processing computer and to improve performance of steering control in terms of reduced control interval and error. The steering control system consisted of a SCU (Steering Control Unit), an EHPS system, and a potentiometer. The SCU consisted of an MCU (Micro Controller unit), an A/D converter, and a DC-DC converter, and a PID controller was used to control steering angle. The steering control system was communicated with the computer by CAN-bus. Each actuator and implement was connected to a multi-function board interfacing with the computer through a USB cable. Without CAN, control interval of the autonomous tractor was 1.5 seconds. When the CAN-based steering control system was combined with the autonomous tractor, however, control interval of the integrated system was reduced to those less than 0.05 seconds. When the autonomous tractor was operated with 1.5-s and 0.05-s control cycles at a 0.63-m/s travelling speed, the trajectories were close to straight lines for both of the control cycles. For a 1.34-m/s traveling speed, tractor trajectory was close to sine wave with a 1.5-s control cycle, but was straight line with a 0.05-s control cycle.