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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.
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.
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.
특성화고 학생들의 과학의 본성(NOS) 이해를 위한 과학기술사 수업 프로그램의 개발 및 적용
서동현 ( Dong Hyun Seo ),이영희 ( Young Hee Lee ),조헌국 ( Hunkoog Jho ) 경북대학교 과학교육연구소 2017 科學敎育硏究誌 Vol.41 No.1
본 연구는 공업계열 특성화고 학생들을 위한 과학기술사 수업 프로그램을 개발하고 적용함으로써 과학의 본성에 대한 이해에 미치는 교육적 효과를 조사하였다. 프로그램은 고등학교 융합 과학 및 물리 I의 교육과정을 바탕으로 6개의 과학기술사 주제로 개발되었으며, 경기도에 위치한 공업계열 특성화고 학생 290명을 대상으로 적용되었다. 본 연구의 방법은 단일 그룹 사전-사후 검사로 설계되었으며. 학생들의 과학의 본성에 대한 이해를 조사하고자 프로그램 적용 전후에 설문을 실시하여 그 검사 결과를 SPSS 23을 이용하여 통계 분석을 실시하였다. 과학의 본성에 대한 설문도구는 선행연구에서 개발된 4가지 영역의 과학의 본성 개념 틀(Lee, 2014)을 수정 보완하여 사용하였다. 본 연구의 결과는 다음과 같다. 첫째, 공업계열 특성화고 학생들의 과학의 본성에 이해에 대한 사전·사후 비교 결과, 과학기술사 수업 프로그램이 학생들의 이해에 효과가 있는 것으로 나타났다. 둘째, 과학기술사 수업 프로그램의 효과는 특성화고 학생들의 성별 및 전공에 따른 차이는 없는 것으로 나타났다. 셋째, 과학의 본성 4가지 영역간의 상관관계 분석에 의하면, 4가지 영역들은 모두 상호 높은 상관관계가 있는 것으로 나타났으며, 특히 각 개별 영역들은 모두 과학과 기술, 그리고 사회와의 상호작용에 대한 과학의 본성 측면과 상관관계가 있는 것이 발견되었다. 한편, 과학기술사 수업 프로그램은 구체적으로 어떻게 학생들의 과학의 본성에 대한 이해에 효과가 있는지에 대한 후속 연구가 필요하다. The purpose of this study was to develop a program for the history of science and technology in order for the technical high school students to understand the nature of science (NOS). The program was composed of the six topics based on the textbooks such as convergence science and physics I, and was taught to 290 10th graders at a technical high school located in the metropolitan area. The questionnaire about NOS was asked the students before and after the instruction, so as to investigate the effect of the program on improving their understandings of NOS. The analysis followed t-test and ANOVA using SPSS 23.0 for Windows program. The questionnaire based on the conceptual framework of the four themes of the NOS (Lee, 2014). The research findings were as follows. First, the program was effective in improving their understanding of NOS since the t-test result was significant statistically for the overall domains of NOS (р<.01). Second, there was no significant gender differences in the understanding of NOS among technical high school students (р<.05), neither did their majors (р<.05). Third, all domains in NOS were statistically correlated (р<.01), and in a particular, each domain was consistently correlated with the aspect of the nature of the interactions among science, technology, and society. Hence, the further studies should be conducted to examine how the history of science and technology effects the understanding of the NOS and how the domains in NOS affected each other.
서동현(Seo Dong-Hyun) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
Degree-day method is very simple but essential index to estimate heating and cooling energy demand in buildings. It has been neglected, however, for the simplicity so it is difficult to find in any DB on the data. Even meteorological department of S. Korea doesn’t report the data officially. In this study, current methods that are being used in many countries are investigated and used to calculate degree-days of 35 S. Korean cities with 30 years (1981~2010) historical data. The calculation result indicates that the error between 4 major methods are dependent on how daily or hourly temperature are treated and balance point temperature. The errors of the methods are no larger than 6% relative to hourly degree-day method.