양성자 조사법에 의한 PT-IGBT의 Turn-off 스위칭 특성 개선

최성환,이용현,권영규,배영호,Choi, Sung-Hwan,Lee, Yong-Hyun,Kwon, Young-Kyu,Bae, Young-Ho 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.12

Proton irradiation technology was used for improvement of switching characteristics of the PT-IGBT. Proton irradiation was carried out at 5.56 MeV energy with $1{\times}10^{12}/cm^2$ doze from the back side of the wafer. The I-V, breakdown voltage, and turn-off delay time of the device were analyzed and compared with those of un-irradiated device and e-beam irradiated device which was conventional method for minority carrier lifetime reduction. For proton irradiated device, the breakdown voltage and the on-state voltage were 733 V and 1.85 V which were originally 749 V and 1.25 V, respectively. The turn-off time has been reduced to 170 ns, which was originally $6{\mu}s$ for the un-irradiated device. The proton irradiated device was superior to e-beam irradiated device for the breakdown voltage and the on-state voltage which were 698 V and 1.95 V, respectively, nevertheless turn-off time of proton irradiated device was reduced to about 60 % compared to that of the e-beam irradiated device.

대요근에 대한 근에너지기법을 이용한 자세이완기법 적용: 사례연구

최성환,홍현표,Choi, Sung-hwan,Hong, Hyun-pyo 대한정형도수물리치료학회 2017 대한정형도수물리치료학회지 Vol.23 No.1

Background: Positional release muscle energy technique (PRMET) is a method joined positional release technique and muscle energy technique. Methods: Subjects those who have low back pain from the acute to chronic phase, were applied PRMET method on psoas major muscle and measured the changes in pain and disfunction. Results: PRMET method is effective for reducing pain and disfunction on psoas major muscle. Conclusions: The advantages of PRMET method are minimized patient inconvenience, shortening of treatment time and effective for improvement. In the future research, methods need to be improved so that this can be applied to other muscles.

Ni계 다공체 금속의 고온 산화 거동

최성환,윤중열,이혜문,공영민,김병기,이기안,Choi, Sung-Hwan,Yun, Jung-Yeul,Lee, Hye-Mun,Kong, Young-Min,Kim, Byoung-Kee,Lee, Kee-Ahn 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2

This study investigated the high temperature oxidation behavior of Ni-22.4%Fe-22%Cr-6%Al (wt.%) porous metal. Two types of open porous metals with different pore sizes of 30 PPI and 40 PPI (pore per inch) were used. A 24-hour TGA test was conducted at three different temperatures of $900^{\circ}C$, $1000^{\circ}C$ and $1100^{\circ}C$. The results of the BET analysis revealed that the specific surface area increased as the pore size decreased from 30 PPI to 40 PPI. The oxidation resistance of porous metal decreased with decreasing pore size. As the temperature increased, the oxidation weight gain of the porous metal also increased. Porous metals mainly created oxides such as $Al_2O_3$, $Cr_2O_3$, $NiAl_2O_4$, and $NiCr_2O_4$. In the 40 PPI porous metal with small pore size and larger specific surface area, the depletion of stabilizing elements such as Al and Cr occurred more quickly during oxidation compared to the 30 PPI porous metal. Ni-Fe-Cr-Al porous metal's high-temperature oxidation micro-mechanism was also discussed.

학술연구 : 학교도서관 협력수업 사례 연구

최성환 ( Sung Hwan Choi ) 한국디지틀도서관포럼 2013 디지틀 도서관 Vol.71 No.-

교육은 학습을 통해서 얻는 지식이 현실에서 부딪히는 문제해결에 도움을 줄 수 있어야 한다. 이에 본 연구에서는 문제해결 능력과 종합적인 사고 능력을 신장시킬 수 있도록 현장성 있는 협력수업 적용 방법을 제시하였다. 구체적인 방법으로는 통합 주제 개발을 통한 협력수업과 프로젝트 학습을 통한 협력수업을 수행하였다. Education is that knowledge gained from learning should be helpful to the problem-solving in reality. Therefore this study suggested application method of cooperative teaching to enhance the abilities of problem-solving and comprehensive thinking. In a concrete method, this research conducted a case study of cooperative teaching through development of integrated theme and project learning.

간척지 우점잡초인 새섬매자기와 벼의 무기양분 흡수특성 및 생장의 차이

최성환(Sung-Hwan Choi),손영걸(Young-Goel Shon),주경섭(Gyung-Seob Ju),이영한(Young-Han Lee),최용조(Yong-Jo Choi),김학윤(Hawk-Yoon Kim),이철호(Cheol-Ho Lee),유용만(Yong-Man Yu),이증주(Jeung-Joo Lee) 韓國雜草學會 2000 Weed&Turfgrass Science Vol.20 No.4

광복이후 비금도 대동염전 개발과정과 사회적 가치

최성환(Choi, Sung-Hwan) 부산대학교 한국민족문화연구소 2016 한국민족문화 Vol.61 No.-

본고는 비금도 대동염전 개발과정에 대한 연구를 통해 광복 후 한국 근현대사의 한 단면과 섬 지역 사회상을 살핀 것이다. 크게 세 가지 방향에서 연구를 진행했다. 첫째, 광복 후 사회적 배경과 염전개발의 절차를 검토했다. 둘째, 대동염전이 개발되는 과정을 분석했다. 셋째, 대동염전에 담긴 섬 지역 사회적 가치와 활용방안을 살폈다. 연구목적을 달성하기 위해 신안군에 소장된 염업 관련 기록물 분석과 개발에 참여한 주민 인터뷰를 병행했다. 광복 후 남북분단으로 남한 사회는 소금부족 현상이 심각했고, 특히 어업이 발달한 섬 지역에서 소금생산의 필요성은 더욱 절실했다. 이에 정부는 민간차원의 염전개발을 권장하였고, 그러한 흐름 속에 대동염전이 개발되었다. 본고에서는 염업관련 기록물 분석을 통해 대동염전 관련조합, 규약, 공사 계획, 간척지 확보와 염전시설 도면 등의 내용을 확인하였다. 대동염전은 1949년 처음 기초가 완성된 이후 몇 차례 확대 과정을 거쳤고, 주도자는 면장 출신 ‘명승주’였다. 원뚝 조성 관리자는 ‘박입하’였고, 염전공사 기술자로는 ‘박문옥’ 등이 활약했다. ‘명일담’은 총염부장을 맡아 대동염전을 관리했다. 대동염전에 담긴 섬 지역 사회적 가치는 ‘염전 개발의 성격’, ‘공동체 문화’, ‘섬 주민의 경제적 기반’, ‘현 운영 주체’, ‘근대문화유산’ 5가지 측면에서 살폈다. 대동염전은 섬사람들 스스로 새로운 공동체를 형성하고 자신들의 경제활동 기반을 개척했다는 측면에서 의미가 크다. 그동안 구전으로만 전해오던 대동염전 개발과정에 대해 처음으로 사료적 분석을 시도한 것이 본 연구의 성과이다. This paper studied the process of developing Daedong Salt Field in Bigeumdo and examined an aspect of modern life of Korea after its liberation from Japanese colonial rule and the social aspect of an island region. The study was conducted in three directions. First, it reviewed the social background after liberation and the process of developing a salt field. Second, it analyzed the process of developing Daedong Salt Field. Third, it reviewed the social value of Daedong Salt Field. To reach the goal of the study, records related to salt manufacture kept in Shinangun County were analyzed, and interviews were conducted with residents who participated in the development. After the division of the Korean Peninsula after the liberation from Japan, salt deficiency was severe and especially in island regions where fishing was developed, there was more urgent necessity to produce salt. So the government recommended the development of salt fields at nongovernmental levels, and against that backdrop, Daedong Salt Field was developed. This paper analyzed documents related to salt manufacture and reviewed associations related to Daedong Salt Field, regulations, construction plans, securing reclaimed land and floor plans for facilities of salt field . Daedong Salt Field went through several expansion processes after its basis was completed in 1949 and the person in charge was Seungju Myung, who used to be a head of a town. The person in charge of construction and management of seawalls was Ipha Park and engineers for the construction of the salt field included Munok Park and others. Ildam Myung took charge of the whole management of laborers in the salt field. The Social value of Daedong Salt Field was viewed from 5 aspects: ‘the characteristics of salt field development’, ‘community culture’, ‘economical basis of the residents in the island’, ‘the main agent of the current operation’, and ‘the heritage of modern culture’. Daedong Salt Field is significant in that islanders themselves built a new community and pioneered a basis of their economic activities for themselves. This study is significant in that it tried the first analysis of historical records on the development of Daedong Salt Field, which has only been handed down orally.

방법과 진리 -해석학의 방법 논쟁을 중심으로-

최성환 ( Sung Hwan Choi ) 한국해석학회 2005 해석학연구 Vol.15 No.-

특집 : 문학, 예술, 그리고 해석학 ; 음악작품과 해석

최성환 ( Sung Hwan Choi ),정은경 ( Eun Gyung Jung ) 한국해석학회 2004 해석학연구 Vol.14 No.-

해석학과 수사학 -사회적,문화적 실천으로서의 인문학-

최성환 ( Sung Hwan Choi ) 한국해석학회 2006 해석학연구 Vol.17 No.-

딜타이의 자기(Selbst)의 해석학 -자기성찰(Selbstbesinnung)과 자서전(Selbstbiographie)을 중심으로-

최성환 ( Sung Hwan Choi ) 한국해석학회 2011 해석학연구 Vol.27 No.-

Es handelt sich hier um einen Versuch, anhand der Selbstbesinnung und der Selbstbiographie ein gesamtes Bild des Philosophierens Diltheys herzustellen. Das von Dilthey sein ganzes Leben hindurch vielfach vorbereitete Programm einer Kritik der historischen Vernunft ist fragmentarisch geblieben. Sein Philosophieren stelle einene muhsamen Prozeß dar, welcher sich von der ersten Erschleßung seines Denkhorizontes bis zur stet neu versuchten Begrundung dieses Denken spannt. Einer der entscheidenden Grunde fur den fragmentarischen Charakter ist ohne Zweifel in Dilthey selbst zu suchen, der wegen seines Programms, seiner Arbeitsweise und des Umfangs seiner Untersuchungen den Anspruch auf Vollendetheit nicht erfullen konnte. Die Selbstebsinnung ist das Organ des Denkens Diltheys, welches schließlich eine Grundlegung des Zusammenhangs der Wissenschsften ermoglicht. Dilthey versteht die Philosophie als eine selbstbesinnende Tatigkeit des Menschen. Entscheidend ist aber, daß dieser Ausdruck Selbstbesinngung nicht nur die allgemeine Bedeutung der Philosophie bezeichnet, sondern ihre Struktur und ihren Inhalt bestimmt, welche mit der naturlichen Entfaltung der Selbstbesinnung mitgegeben werden. Und die Selbstbiographie ist ein ausgezeichnetes Mittel, das Ergebnis der Selbstbesinnung zu veranschaulichen. Die Selbstbesinnung uber sich selbst, stellt daher Richtpunkt und Grundlage fur das eigene Philoso phierens dar. Die Autobiographie wird so zu einer besonders ausgezei chneten Quelle. Hier scheint die Besinnung des Lebens ganz dicht bei sich selbst zu sein. In diesem Sinne ist es erlaubt, Diltheys Philosophie als eine Hermeneutik des Selbst zu bezeichnen.