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.

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.

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.

개항(開港) 초기(初期) 목포항(木浦港)의 일본인(日本人)과 해상(海上)네트워크

崔誠桓 ( Choi Sung-hwan ) 인하대학교 한국학연구소 2012 한국학연구 Vol.0 No.26

1897년 開港 이후 목포항 일본인 사회를 주도한 사람들의 특징과 목포권 海上네트워크를 살펴보았다. 연구범위는 1897년 개항부터 1910년까지개항기 상황에 초점을 맞추었다. 세부 주제와 연구결과를 요약하면 다음과 같다. 첫째, 開港배경으로서 목포의 공간적 특징 관련이다. 개항 이전 역사적 흐름 속에서 발견되는 특징과 개항기 외국인들이 인식한 특징으로 구분해 살펴보았다. 목포는 영산강의 길목이며, 湖南 곡창지대와의 근접성, 부산 및 인천항과의 연결성, 항구도시로서 성장가능성 등 공간적 특징을 지니고 있었다. 둘째, 목포항의 일본인 이주와 주도층 양상이다. 長崎縣과 山口縣 출신자들이 많았다. 특히 山口縣 출신자들은 목포 상권을 장악하고, 주도적 역할을 했다. 개항 초기 목포 상업은 부산의 영향력이 컸다. 대부분 상인들이 부산을 거쳐 목포로 진출한 경우가 많았고, 지속적인 연결고리를 지녔다. 이들은 일본거류민회와 상업회의소의 임원을 맡아 목포에서 영향력을 행사하였다. 또한 일본인 주요 인사들이 지속적으로 목포에 거주하는 비율은 그리 높지 않았다는 특징이 있다. 셋째, 목포항의 해상네트워크 관련이다. 개항을 계기로 汽船이 보급되고 목포 쌀이 이출되는 것과 관련하여 더욱 발전하였다. 목포항은 영산 강과 바닷길을 이용한 해상네트워크를 기반으로 전남물산의 집산지가 되었고, 쌀이 일본과 중국지역으로 이출되면서 국제적인 교류 망을 형성하였다. 사람들의 왕래는 국외는 일본지역이 중심이었고, 국내는 서해안 권에 위치한 인천항이 많았다. 물류는 부산항과의 거래가 많았다. 한편 목포항의 해상네트워크는 개항을 계기로 국제적으로 넓어지고 발전했지만, 쌀을 이출하는 것을 목적으로 개항된 항구였기 때문에 그 범위가 일본과 중국을 벗어나지 못하는 한계점도 나타난다. This study examines the characteristics of Japanese society taking initiative at Mokpo Port after the port opening in 1897 and the marine network in Mokpo area. The range of this research is focused on the port opening in 1897 till 1910, the port opening period. The detailed subject and research results can be summed up as below: First, it is about the spatial characteristics of Mokpo as the open port. It was examined after divided into the characteristics found in the historic flow before the port opening and the characteristics recognized by foreigners during the port opening period. Mokpo is in the corner of Yeongsan-gang. It is characterized by spatial features like closeness to Honam Grain Belt, connectivity to Busan and Incheon Port, and growth potentials as a port city. Second, it is about Japanese' move and social aspects at Mokpo Port. There were many of those who were from Nagasaki or Yamaguchi. Especially, those from Yamaguchi gained commercial supremacy in Mokpo and took the lead in it. In the beginning of the port opening period, industry in Mokpo was greatly influenced by Busan. Most merchants passed through Busan and entered Mokpo, and there was constant linkage in it. They exhibited influence in Mokpo as the board members of the Japanese Residents Committee or the Chamber of Commerce. Another characteristic is that there were few Japanese chief figures who stayed in Mokpo for a long period. Third, it is about the marine network in Mokpo Port. With port opening as a start, steamships were induced, and with the exportation of Mokpo rice, it was even more developed. Mokpo Port became the trading center of Jeonnam's products based on the marine network using Yeongsan-gang and the sea routes. As the rice became exported to Japan or China, an international exchange network was formed. In the outside, Japan was the center of people's traffic, and in the inside, Incheon Port and Gunsan Port located in the West Coast were the center. Meanwhile, the marine network of Mokpo Port was widened and developed internationally with port opening as a start; however, since it was the port opened in order to export rice, the range was inevitably limited to Japan and China.

1920년대 목포청년운동과 지역엘리트의 성격에 대한 연구

최성환 ( Sung Hwan Choi ) 순천향대학교 인문과학연구소 2016 순천향 인문과학논총 Vol.35 No.1

목포는 섬과 바다로 열려있는 해항도시이며, 1897년 ``개항``이라는 특수한 상황을 통해 급격한 도시화가 이루어진 지역이라는 특징이 있다. 이 글은 1920년대 목포의 사회경제적 배경을 바탕으로 청년운동 전개과정과 지역엘리트의 성격을 분석한 것이다. 1920년대 목포는 물산공진회를 개최하는 등 전남의 대표도시로 성장했다. 그러나 일본인과의 차별이 심했고, 식민지 수탈항 성격이 강했다. 그 가운데 부협의회에 진출하는 조선인 수가 늘어나고, 노동파업이 본격화 되는 등 여러 가지 사회적 변화가 있었다. 이러한 배경 하에 진행된 목포청년운동의 전개과정은 크게 6단계로 구분되었다. 1단계, 1920년대 초에는 지역 명망가들을 얼굴로 내세운 채 출발했다. 2단계, 지역의 신진사업가들이 표면에 등장하였다. 3단계, 회장제에서 이사제로 변경되고, 청년회 임원들의 부협의회 진출이 이루어졌다. 4단계, 사회주의 성향의 청년운동이 대두하였다. 5단계, 목포청년회와 무산청년회가 병존하여 지역 관심사에 공동 대응하는 수준으로 발전하였다. 6단계, 목포청년회는 해체되고, 신간회 중심의 민족사회운동 전개로 변화한다. 또한 이 시기 목포지역엘리트의 면모에는 다섯 가지 특징이 나타난다. 첫째, 퇴직 공무원들이 지역엘리트로 자리 잡는 현상이다. 둘째, 신진 상업인들이 중심세력을 이뤘다. 셋째, 경상도 출신자들이 많았다. 넷째, 1919년 만세운동 관련자의 활동이 두드러졌다. 다섯째, 목포 인근 섬 출신 인물들이 많았다. 이러한 특징에는 개항을 계기로 도시화 된 목포의 지역성이 반영되어 있다. The purpose of this study is to analyze the process of youth movement and the characteristics of local elite based on the socioeconomic background in the 1920`s Mokpo. During the 1920`s, Mokpo grew as a representative city of Jeonnam holding Mulsangongjinhoe[an agricultural fair] or such. However, the port was notorious for colonial exploitation, and discrimination between Koreans and Japanese still existed. In the meantime, there were some changes in the society as Chosun people entering Buhyeopuihoe[a provincial assembly] were increasing, and labor started to go on strike genuinely. The 1920`s Mokpo youth movement developed in this background can be divided largely into six steps. In Step 1, during the early 1920`s, it began with the men of repute in the region. In Step 2, the businesspersons of the region appeared on the surface practically. In Step 3, it changed from the presidential system to the director system, and the executives from the youth group joined in Buhyeopuihoe. In Step 4, after Musancheongnyeonhoe[Propertylessyouth association] was organized, socialistic youth movement began. In Step 5, as Mokpocheongnyeonhoe[Mokpo-youth association] and Musancheongnyeonhoe coexisted, they coped with the issues of the region collaboratively. In Step 6, Mokpocheongnyeonhoe was disorganized, and it changed to ethnic social movement centered around Singanhoe[新幹會]. In this period, the elite in Mokpo have five characteristics. First, retired public officers became the elite of the region. Second, the newly rising businesspersons formed the main force. Third, many people were from Gyeongsang-do. Fourth, those involved in 1919 Manse Movement were in full activity. Fifth, there were a lot of people from the islands adjacent to Mokpo.

19세기 초 문순득의 표류경험과 그 영향

최성환(Choi Sung-Hwan) 역사문화학회 2010 지방사와 지방문화 Vol.13 No.1

문순득은 조선후기 현 신안군 우이도에 살았던 상인이다. 1802년 1월 태사도(현 대흑산도 인근)에서 표류하여 琉求 · 呂宋 · 澳門 등을 체험하고, 중국대륙을 경유하여 1805년 1월에 고향에 돌아왔다. 본 연구의 목적은 문순득이 표류를 통해 획득한 새로운 경험의 특징과 주변 지식인들에게 미친 영향을 검토하는 것이다. 문순득이 표류기간 중 체험한 지역 중에는 유독 국제적인 무역항이 다수 포함되어 있었다. 그 경험은 문순득 자신의 세계인식 확대로 연결되었고, 바닷길을 통해 정약용이나 이강회 같은 실학자에게 전파되었다. 그들은 문순득의 독특한 표류경험을 매우 중요하게 인식하였고, 많은 영향을 받았다. 정약용은 『經世遺表』나 『事大考例』에서 구체적으로 문순득의 경험담을 인용하였다. 직접 우이도로 건너 온 이강회는 문순득의 경험을 토대로 국내외 선박과 항해문화를 비교한 「雲谷船說」을 집필하였다. 또 『耽羅職方說』에서는 “달량부에 외국선박을 위해 특별시장을 조성하자”는 주장을 폈는데, 이는 이강회가 문순득의 표류경험을 가장 적극적으로 받아들이고 활용한 사례였다. 이처럼 문순득의 표류경험과 인식은 주변인들에게 많은 영향을 주었고, 특히 실학자들을 통해 구체적인 실천론으로 발전하고 있었다. The purpose of this study was to investigate the characteristics of Mun Sun-deuk's new experiences through drifting and his influences on intellectuals around him. Among the areas he went through during drifting, there were especially many international trading ports. Such experiences led to the expansion of his world view and were passed onto such practical scientists as Jeong Yak-yong and Lee Gang-hoi through the sea route. Those practical scientists placed great value on Mun's unique drifting experiences and were much affected by them. Jeong cited Mun' s experiences specifically in his Gyeongseyupyo and Sadaegorye. Coming from Wooi Island, Lee wrote Woongokseonseol, which compared Joseon and other countries in terms of ships and navigation cultures first in the country, based on Mun' s experiences. His argument that "A special market should be set up for foreign ships at Dalryangbu" in Tamrajikbangseol was a case that accepted and utilized Mun' s drifting experiences most actively. Those cases clearly show that Mun' s drifting experiences and perceptions had huge impacts on people around him and were developed specific theories of practice by practical scientists.

삶의 형식으로서의 학문

최성환(Sung-Hwan, Choi) 중앙대학교 중앙철학연구소 2003 철학탐구 Vol.15 No.-

놀이의 해석학 -전통놀이 문화의 해석을 위한 시론-

최성환 ( Sung Hwan Choi ),최인자 ( In Ja Choi ) 한국해석학회 2006 해석학연구 Vol.18 No.-

The present study purposed to examine the meanings of play in human life and the philosophical meanings of plays. First, in order to highlight the importance of the concept of play, we compared the concept of play suggested by J. Huizinga that comprehends several viewpoints with concepts presented by other scholars such as R. Caillois and H. G. Gadamer. Many of Western philosophers from Heraclitos to J. Huizinga understood plays not as activities with simple purposes but as structure with unique properties that can make decisive contributes to the explanation of human beings and the world. In particular, Huizinga emphasized the cultural creativity of plays based on the fact that all cultures originate from plays. R. Caillois appreciated Huizinga`s play theory high but, at the same time, insisted in a critical position that play develop from the fundamental forces called ``paidia`` and ``ludus`` and by the principle of freedom. He maintained that plays contribute to the refinement of human culture and the advance of moral values. The concept of plays suggested by Gadamer gives philosophical support to Huizinga`s theory. Explaining the ontological characteristics of plays through fundamental hermeneutics of plays and arts, he asserted that a play itself is the subject of playing activities and an art work is an encounter with an aesthetic being by event(Geschehen) occurring unceasingly from absorption in the play. Based on the ground of discussion, this study attempts to explain play types in connection to the existence pattern of people`s life. Here, we will identify the types of Korean traditional plays(culture) along with ordinary plays in the East and the West. As an essayistic attempt to approach traditional plays(culture) more systematically, this study adopts an analytic approach. Based on the concept of the hermeneutical cycle of experience, expression and understanding as suggested by W. Dilthey, we refine the meaning through concepts suggested by Gadamer`s philosophical hermenutics such as publicness and openness, cultivation and apply it in explaining the significance and characteristics of Korean traditional plays (culture). We reinterpret experience as social-cultural practice accompanied with historical experience, expression as the formation of publicness and the practice of openness, and understanding as the practice of cultivation (culture) that realizes humanity. In addition, we will demonstrate the contemporariness of play education as cultural education from F. E. E. Spranger`s educational viewpoint and ultimately show the continuity of culture and the meanings of traditional culture. The model called ``the trio of play, common sense and hermenutical cycle (Erlebnis, Ausdruck, Verstehen) provides guidelines for applying play education to the field as cultural education. In conclusion, the present study purposed to refresh the understanding of tradition through examining plays from an analytic perspective and to suggest the meanings of the inheritance of culture and future directions for play education as cultural education.

다문화 인문학과 해석학

최성환(Choi, Sung-Hwan) 중앙대학교 중앙철학연구소 2015 철학탐구 Vol.40 No.-

이 글은 다문화사회로 진입하는 한국 사회에서 다문화 연구, 특히 다문화 인문학 연구의 방향설정을 위해 학문적 이념을 해석학의 학문적 성격을 토대로 제시하고자 한다. 해석학의 전통이 보여주는 다문화적 요소뿐만 대화, 이해, 실천, 교육 그리고 인간성과 같은 해석학의 주제이자 본질적 경향들은 다문화인문학 연구를 위한 적절한 이념적 틀을 제시해 주고 있다. 특히 이 글은 다문화인문학의 실천적 성격을 강조하면서 지나친 이론 중심적 논의보다는 이러한 실천적 성격을 잘 반영하고 진작할 수 있는 연구방향과 연구실행이 요청된다는 주장을 적극적으로 표명한다. Today, the progress to multicultural society seems to be an irreversible flow at least in our country [Korea]. The efforts to minimize the problems arise during the process of progress to multicultural society, to suggest various policy alternatives in order to settle into a stable society and to academically deepen the understanding about new society (formation) are important. However, for example, outcomes that are produced thoughtlessly without any academic philosophy to process research support programs that are delivered through various sources can sometimes discolor the original meaning of multicultural studies per se which are ‘practical application’ and ‘promotion of mutual understanding’. Of course forcing specific philosophical stereotypes to the cultural research in a humanistic sense can prevent privately-owned free play [amusement]. Nevertheless, blind multicultural studies without any convergent point have a possibility of encouraging both researchers and all the readers not only an unproductive but also an unnecessary prejudice regarding multicultural phenomenon. From this perspective, this paper suggests philosophical stereotypes that can lead the study of multicultural humanities based on the feature of hermeneutical thinking. This is because hermeneutical thinking seems appropriate for studying various culture formalities and open and practical cultural relation.

기체-액체 이젝터 유동의 가시화와 광섬유 탐침에 의한 기포분율 측정

최성환(Sung Hwan Choi),지호성(Ho Seong Ji),김경천(Kyung Chun Kim) 한국가시화정보학회 2013 한국가시화정보학회지 Vol.11 No.1

Gas/liquid two-phase ejector is a device without moving parts, in which liquid is used to drive gas of a low-pressure source. In this paper, the hydrodynamic characteristics of a vertical down type two phase ejector were studied using an air-water loop system. Entrained air flow rates were measured with inlet and outlet pressures of the ejector with varying water flow rate. Homogeneous bubbly flows in the discharge pipe were confirmed by the high speed flow visualization method. Quantitative measurements of void fraction were made using a newly developed fiber optic probe system.