단순변형률 조건 하의 회전하는 가변단면 $90^{\circ}$ 곡덕트내 외향 난류유동 측정

오창민,최영돈,Oh, Chang-Min,Choi, Young-Don 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.5

Hot-wire measurements were carried out on the developing turbulent flows subject to plane rate of strain in a rotating curved duct. The cross-section of the curved duct varies from 100mm${\times}$50mm rectangular shape at the bend inlet gradually to the 50mm${\times}$100mm rectangular shape at the bend outlet. Experimental setup consists of the test section of $90^{\circ}$ curved duct, rotating disc of 1.95m diameter, Ag-Ni precision slip ring, automatic traversing mechanism, variable speed motor, centrifugal blower, orifice flowmeter and hot-wire anemometer. Data signals from the rotating curved duct are transmitted through the slip ring to the computer which is located at the outside of the rotating disc. 3-dimensional velocity and 6 Reynold stresses components were obtained from the fluctuating and mean voltage measured by the slant type hot-wire probe rotating into 6 orientations. We investigate the effects of Coriolis and centrifugal forces on the turbulence structure.

실험적(實驗的) 구루병(病) 백서(白鼠)의 치아(齒牙) 급(及) 경골(脛骨)에 관(關)한 병리(病理) 조직학적(組織學的) 연구(硏究)

오창민,조영필,Oh, Chang-Min,Cho, Young-Pill 대한악안면성형재건외과학회 1993 Maxillofacial Plastic Reconstructive Surgery Vol.15 No.2

The purpose of this study was to observe the effect on teeth and tibia bone histopathologically in rats by the richitogenic diet. For this purpose, 48 sprague-dewley rats, weighing 80g or more, divided into 6 groups, and sacrificed on the 1st, 2nd, 3rd, 4th, 5th, 6th weeks after experiments respectively. The tissues contain tooth, and tibial bone were fixed in 10% normal formalin solution, decalcified in Plank-Rychlo solution, embedded in paraffin, sectioned in $6-8{\mu}$ as usual manner, the tissues were stained in hematoxylin eosin, and examined hisopathologically. Follow results were attained 1. Pyknotic appearance of odontoblastic layer was noticed on the 1st week, and increased on the 2nd weeks, and it is appeared that degeneration and dearrangements of odontoblasts on the 4 weeks. But a little recovered on the 6th weeks. 2. The thickness of predentin layer was increased on the 2nd weeks, and increased remarkedly on the 3rd weeks and reached the maximum on the 5th weeks. 3. The interglobular dentin was appeared in spotty shape on the 2nd weeks, and increased on the 4th, 5th, weeks, and large amount of inter-globular dentin was appearanced on the 6th weeks. 4. It is appeared that enamel hypoplasia on the 4th weeks. 5. Epiphyseal and metaphyseal plate of tibia was increased from/on the 2nd weeks, increased maximumly on the 5th weeks. And pyknotic, dearrangements, and hyperchromatic appearances of chondrocytes on the plate were increased on the 1st week.

소수자 운동의 주체와 방향 - "호모 사케르"를 넘어 "다중"의 정치로

오창민 ( Chang Min Oh ) 아시아문화학술원 2016 인문사회 21 Vol.7 No.3

이 글은 소수자 운동의 주체와 방향의 측면에서 아감벤의 호모 사케르와네그리의 다중 개념을 고찰하였다. 아감벤은 ‘호모 사케르’ 개념을 통해 정치적이고 사회적인 약자를 생산해내는 주권 권력의 메커니즘을 적절하게 분석한다. 아감벤은 주권 권력의 질서와 안정성의 환상을 폭로하고, 예외상태가 일상이 되어버린 우리에게 실존적 삶의 성찰을 요구한다. 네그리는 아감벤의 휴머니즘적 성찰과 공감·연대의 정치를 넘어서서 전지구적인 노동과 생산의 성격변화에 상응하는 유물론적 주체인 다중을 통해 자유의 공간을 확장해가는 구성권력을 제시하였다. 네그리의 구성권력은 현재의 주권 권력의 대체가 아니다. 구성권력은 우리의 삶, 조직화, 생산에서 새로운 활력을 발전시키고자 하는 것이다. 다중의 정치는 근대 주권의 통치패러다임에 맞서는 동시에 벗어나는 것이며, 대안적인 삶의 형식을 만들어가는 것이다. 그런 의미에서 소수자 운동의 방향은 다수자 운동을 지향하는 방식 또는 다수자의 인정과 공감을 요구하는 방식보다는 자신들의 특이성을 확장해가면서 기존 제도나 체계의 경계를 돌파해가는 흐름으로 이어져야 할 것이다. This article analyzes Agamben’s ‘homo sacer’ and Negri’s ‘multitude’ interms of the subject and direction in minority movement. Agamben insists on mechanism of sovereign power that produces politically and socially disadvantaged through ‘homo sacer’ concept. Agamben exposes the stable order of sovereign powerand demand existential life in state of exception on the everydayness. On the other hand, Negri is beyond Agamben’s reflection of humanism and politics of empathy and solidarity. Negri presents constitutional power that extend place of liberation through the multitude as materialist subject who correspond changes ofglobal labor and production system. Negri’s ‘constitutional power’ isn``t a substitute for sovereign power. Constitutional power enhances vitality in our life, organizing and production. The multitude politicsagainst ruling paradigm and at the same time escape from modern sovereignty. In addition, it achieves alternatively form of life. Therefore, The subject and direction in minority movement need to expandsingularite rather than oriented status of majority. It must break through existing systems and border

질산성 질소 제거용 Quaternized Poly(vinylimidazole-co-trifluoroethylmethacrylate-codivinylbenzene) 음이온교환막 제조와 관능화 조건

오창민(Chang Min Oh),황택성(Taek Sung Hwang) 한국고분자학회 2015 폴리머 Vol.39 No.1

본 연구에서는 수중 질산성 질소(NO3<SUP>-</SUP>) 제거용 음이온교환막 제조를 위하여 poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene)(PVTD) 공중합체를 제조하고, quaternization 반응을 통하여 관능기를 도입하기 위한 최적화 반응온도, 반응시간, 관능화농도 조건을 규명하였다. 제조한 음이온교환막의 구조 확인과 분자량 측정을 위하여 FTIR, <SUP>1</SUP>H NMR, 스펙트럼 분석과 GPC 분석을 하였다. 또한 제조한 음이온교환막의 함수율, 팽윤율, 전기저항, 이온교환용량과 같은 기본물성을 측정하였다. 또한 수중 질산염 제거율과 선택성을 확인하기 위하여 막의 음이온 투과성을 측정하여 질산성 질소의 선택성을 확인하였다. 최적 함수율, 전기저항, 이온교환용량은 각각 51.2%, 5.4 Ω·cm<SUP>2</SUP>, 1.04 meq/g으로 측정되었다. In this study, we synthesized poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene) (PVTD) copolymer and introduced functional group through quaternization reaction for removing nitrate from drinking water. Also, optimizing conditions (reaction time, reaction temperature and functionalized agents concentration) for introducing the functional group were confirmed. The basic properties such as water uptake, swelling ratio, electrical resistance, ion exchange capacity and anion permselectivity for removing nitrate from drinking water were measured. The optimal values of water uptake, electrical resistance and ion exchange capacity of synthesized anion exchange membrane were 51.2%, 5.4 Ω·cm<SUP>2</SUP>, and 1.04 meq/g, respectively.

대기업 공장 내 정규직-비정규직 노동자의 법정외 기업복지에 관한 연구

오창민 ( Chang Min Oh ) 전남대학교 사회과학연구소 2014 현대사회과학연구 Vol.18 No.-

이 글은 광주 지역의 대표적인 대기업 제조업체인 금호타이어와 기아자동차를 사례로 고용형태(정규직, 비정규직)에 따른 법정외 기업복지의 격차를 비교 분석하였다. 분석을 위해 매년 고용노동부에서 발간되는 『기업체노동비용조사보고서』와 사례 기업의 단체협상 내용을 참고하였다. 분석 결과, 두 기업의 정규직 노동자들은 주거, 건강보건, 보육, 학비보조, 휴양문화체육오락, 사내근로복지기금출연금, 우리사주제도지원금 등에서 복지혜택을 받고 있고, 비정규직 노동자는식사지원 정도의 법정외 복지 수혜를 받고 있음을 확인하였다. 임금은 통장으로 지급되기 때문에 비가시적이지만, 기업복지는 작업현장 네에서도 가시적으로 이루어지기 때문에, 비정규직 노동자들에게 심리적 소외와 무력감을 만들어내고 있다. 기업은 법정외 복지를 통해서 노동자를 더 효율적으로 관리.통제 할 수 있는 자원으로 활용하고 있고. 대기업 정규직 중심의 노동조합 역시 높은 현금급여에 따른 일부의 사회적 비난을 회피하기 위해 기업복지를 선호하기도 한다. 이런 상황에서 비정규직 노동자들은 모든 복지의 영역에서 배제될 수 밖에 없다. 결국 법정외 기업복지는 노동자들간 격차와 위계를 형성하는 과정에서 하나의 기제로 작동하고 있으며, 이는 국가복지를 어떻게 바라볼 것인가라는 문제와도 연동된다. 국가복지는 기업규모, 업종, 고용형태에 따른 복지의 격차문제를 어떻게 풀어나갈 것인지. 나아가 고용여부와 상관없이 어떻게 전체국민의 사회적 안전망을 확보할 것인지의 폭넓은 문제로까지 논의되어야 할 것이다. This article analyzes the gap in non-legally required company welfare by employment type (standard and non-standard) of two major representative manufacturing companies in Gwangju metropolitan city, KUMHO Tire and KTA Motors. References for this article are from Report on Enterprise Labor Cost Survey which are published annualy by Ministry of Employment and Labor. And this aticle analyzed of the Labor Collective Agreement by each trade union. The article shows that the standard workers of the two companies received various company welfare such as support on housing, medical ana health care, child care expenses, school expenses, recreation, contribution to employee welfare fund and even employee stock ownership association, On the contrary, the contrary, the nonstandard workers got small benefit such as support on canteens and other food services as non-legally required company welfare. Wages are non-visible as they are paid through bankbook. However, company welfare is visible at workplace which cna create sense of alienation and a feeling of helplessness for the nonstandard emplpyees. stock ownership association. On the contrary, the nonstandard workers got small benefit such as support on canteens and other food services as non-legally required company welfare. Wages are non-visible as they are paid through bankbook. However, company welfare is visible at workplace which can create sense of alienation and a feeling of helplessness for the nonstandard emplpyees. Nrmally, companies use this non-legally required company welfare as a tool to manage and control workers. Trade unions of these companies also prefer this to avoid the social blame caused by high total cash payment. This circumstance forces nonstandard workers to be excluded from various kinds of company welfare. In conclusion, non-legally required company welfare is operation as a mechanism in the process of making a gap and hierarchy between standard and nonstandard emplpyees. This whole situation is related to the issue of how the national welfare should be viewed. The state welfare should be considered and debated not only about how to reduce the welfare divide caused by the size of the corporation, type of business and form of employment but the broader questions such as how to secure a social safety net for the public in the future.

생산성을 고려한 볼라드 및 볼라드 지지 구조의 최종강도 평가

오창민(Chang-Min Oh),정준모(Joonmo Choung),조상래(Sang-Rai Cho) 대한조선학회 2006 大韓造船學會 論文集 Vol.43 No.5

초음파 표면개질에 의한 CDI 전극용 술폰화 염화비닐(PVC) 멤브레인의 제조 및 특성

황치원 ( Chi Won Hwang ),오창민 ( Chang Min Oh ),황택성 ( Taek Sung Hwang ) 한국접착및계면학회 2014 접착 및 계면 Vol.15 No.1

이온 교환막은 전기투석, 확산투석, Redox flow 전지, 연료전지 등 다양하고 넓은 분야에서 사용되고 있다. 초음파를 이용하여 만들어진 PVC 양이온 교환막을 시간을 변화시켜 가면서 술폰화 반응에 의해 제조하였다. 술폰화제로 황산을 사용하였으며, 술폰화 PVC 양이온 교환막의 기본구조와 특성을 FT-IR, EDX, Water uptake, 이온교환용량(IEC), 전기저항(ER), 전도도, 이온수송수 및 표면 morphology를 SEM 분석하였다. FT-IR 스펙트럼 분석결과 술폰화 PVC 양이온 교환막에 술폰산기가 도입되었음을 확인하였으며 멤브레인의 Water uptake, IEC, 전기 저항 및 ion transport number의 최대값은 각각 40.2%, 0.87 meq/g, 35.2 Ω·cm 및 0.88이었다. Ion exchange membrane is widely used in various fields such as electro dialysis, diffusion dialysis, redox flow battery, fuel cell. PVC cation exchange membrane using ultrasonic modification was prepared by sulfonation reaction in various sulfonation times. Sulfuric acid was used as a sulfonating agent with ultrasonic condition. We`ve characterized basic structure of sulfonated PVC cation exchange membrane by FT-IR, EDX, water uptake, ion exchange capacity (IEC), electrical resistance (ER), conductivity, ion transport number and surface morphology (SEM). The presence of sulfonic groups in the sulfonated PVC cation exchange membrane was confirmed by FT-IR. The maximum values of water uptake, IEC, electrical resistance and ion transport number were 40.2%, 0.87 meq/g, 35.2 Ω.cm and 0.88, respectively.

새싹대마 안정 생산기술 개발

김현경(Hyun Kyung Kim),정지은(Ji Eun Jeong),오용석(Yong Seok Oh),오창민(Chang Min Oh),이공인(Gong In Lee) 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.10

口腔扁平上皮細胞癌에 對한 放射線 治驗例

徐鎭寬(Jene Kwan Suh),權鶴周(Hak Joo Kwon),安春吉(Choon Kil Ahn),李容五(Yong Oh Lee),申文赫(Moon Hyok Shin),吳昌敏(Chang Min Oh),李鍾吉(Jong Kil Lee) 대한치과의사협회 1972 대한치과의사협회지 Vol.10 No.2

상하악골 동시이동술에 의한 하악전돌증의 치험례

오창민,최영수,서연호,문선혜,이용오,서연호 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.4

This is a case of the mandibular prognathism with maxillary deficiency of 17-year-old male, who underwent correction of dentofacial deformity using the simultaneous mobilization of the maxilla and mandible with pre and postop. orthodontic treament. After the careful clinical, cephalometric and model analysis, the patient was treated with Le Fort I osteotomy on the maxila, inverted L osteotomy on the mandible, and the treatment results were analyzed radiographically and clinically. The results were as follows; The maxilla was repositioned anteriorly(Rt: 6mm, Lt: 5mm at the occlusal level) and the mandible rotated counter-clockwise, repositioned posteriorly(Rt: 6mm, Lt: 7mm at the occlusal level). The pre and postop. orthodontic treatment improved the esthetic and functional results of orthognathic surgery. Eleven-month postop. follow-up records showed minimal change in the position of maxilla and mandible.