Microvascular Anastomotic Coupler System을 이용한 쉽고, 빠른 혈관문합

정남연(Nam Yun Chung),임홍철(Hong Cheol Lim),이순혁(Soon Hyuck Lee),박종훈(Jong Hoon Park),박종웅(Jong Woong Park) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.1

목적: 골, 연부조직 결손의 재건을 위한 유리조직 이식 시 microvascular anastomotic coupler (MAC)를 이용한 미세혈관 문합의 결과를 보고하고자 한다. 대상 및 방법: 유리 조직 이식술 시 MAC coupler 시스템을 이용하여 정맥 문합을 시행한 12명의 환자 20예의 정맥문합을 대상으로 하였다. 환자의 연령, 성별, 수술 당시 진단명, 공여부 조직, 공여부 및 수여부 혈관의 직경, coupler의 크기, 문합 소요시간, 문합 직후 문합 부위의 혈관 개존 및 누혈 여부, 유리 조직 이식술의 성공 여부 등을 조사하였다. 결과: MAC coupler를 이용한 정맥 문합에 소요된 시간은 평균 3분 15초였다. 전 예에서 문합 직후 문합부의 누혈이나 혈전 형성이 관찰되지 않아 100%의 직후 개존율을 보였으며 이식 조직은 장기 추시 시 전 예에서 혈관의 개존이 유지되어 생존하였다. 결론: 정형외과 영역의 미세 재건술 시 coupler 시스템을 사용함으로써 미세 혈관 문합시간을 단축할 수 있어 수술 시간과 유리 조직의 허혈시간을 획기적으로 단축할 수 있었다. 이 시스템은 사용방법의 습득이 용이하고, 혈관 내막의 손상이 적으며, 초기 문합 강도가 우수할 뿐 아니라 문합 혈관의 직경차도 쉽게 극복할 수 있어 미세 봉합사를 이용한 고식적 혈관 문합을 대치할 수 있는 좋은 수술방법으로 사료된다. Purpose: We report the results of microvascular anastomosis using a microvascular anastomotic coupler (MAC) system. Materials and Methods: Twenty cases (12 patients) of venous anastomoses performed using a coupler system were examined. The patients' age, gender, preoperative diagnosis, donor tissue, vessel diameters, size of coupler, time for anastomosis, patency rate immediately after surgery and the final survival rate of the transferred tissue were evaluated. Results: The mean time for anastomosis using the coupler system was 3 min and 15 sec. The immediate patency rate after anastomosis was 100% without any leakage of blood or thrombus formation. At the final follow up, the transferred tissue survived in all cases. Conclusion: Microvascular anastomosis using a coupler system in orthopaedic reconstructive surgery can shorten the vascular anastomosis time and significantly reduce the total ischemic time of the transferred tissue. This system can be easily used after a short training period. This system minimizes the intimal damage of the vessel, easily overcomes the diameter discrepancy and provides secure fixation at the anastomosis site. This system can be a good strategy for substituting the conventional suture anastomosis.

엔진 오일 점도에 따른 커넥팅 로드 핀 부시의 유막 거동에 관한 수치적 해석

정남인(Nam In Jeong),김한구(Han Goo Kim),심종현(Jong Hyun Shim),김청균(Chung Kyun Kim) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6

A connecting rod is one of the most important element in the piston engine which is joined a piston to a crankshaft. Pin bush is suffered by heat and changable load that occur the piston cylinder. Therefore, pin bush temperature raise faster than other parts of connecting rod. To keep pin bush working effectively, it would be satisfied with proper oil film strength for severe operating condition and durability. In this study, a numerical analysis is carried out due to viscosity variance of diesel engine oil and temperature. The viscosity variance of engine oil have a little effected on the minimum oil film thickness, on the other hand, have effected on total friction loss power.

Microfluidics를 이용한 화장품 에멀젼 캡슐레이션에 대한 연구

정남균(Nam-Gyun Jeong),진홍종(Hong-Jong Jin) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.1

화장품 산업은 정밀화학분야로 기술집약적인 산업이며 세계적으로 지속적인 성장률을 보이고 있다. 이러한 화장품 산업에서 시장 점유율을 높이기 위해 과거에는 기능적 측면이 주로 강조가 되어 왔으나, 최근에는 국내외적으로 화장품의 우수한 성능과 더불어 시각적 효과로 소비자의 관심을 유도하려는 노력이 고조되고 있다. 이에 따라 화장품 제조업체에서는 화장품 에멀젼을 캡슐화하고 에멀젼 캡슐의 형태, 색상 및 질감 등을 다양하게 변형시킬 수 있는 기술을 다방면으로 시도하고 있는 상황이다. 에멀젼을 캡슐화하는 기본 방식은 에멀젼 저장소에 에멀젼을 채워 넣고 노즐을 통해 에멀젼을 낙하시키는 방법으로 업체에서 가장 쉽게 이용할 수 있다. 그러나, 에멀젼을 캡슐레이션하는 기존 방식은 캡슐의 사이즈를 줄이는 데 한계가 있다. 본 연구에서는 이러한 기존 방식의 한계를 이론 및 수치해석방법으로 고찰하였으며, 이러한 방식의 문제를 해결하기 위한 대안책으로 미세유체역학(Microfluidics)을 적용하기 위하여 마이크로 채널 내에서 발생하는 에멀젼 캡슐레이션 현상을 연구하였다. The cosmetic industry is technology-intensive in the field of fine chemistry and continues to grow globally. The functional aspects have been mainly emphasized in the past to increase the market share in these cosmetics industries. Recently, however, efforts have been made to attract the attention of consumers to the visual effects as well as the excellent performance of cosmetics at home and abroad. Accordingly, cosmetic manufacturers are trying various technologies that encapsulate the cosmetic emulsion and modify the shape, color, and texture of the emulsion capsule. The basic and easiest method of encapsulating emulsion is dropping the emulsion through the nozzle from emulsion storage. On the other hand, the existing method of encapsulating emulsion has a limit in reducing the size of the capsule. In this study, the limit was shown by theory and numerical analysis method, and the emulsion encapsulation phenomena occurring in the micro-channel were studied to apply microfluidics as an alternative.

FE-BEM을 결합한 벽체의 해석모델 개발

정남수,최원,이호재,김한중,이정재,김종옥,Jung , Nam-Su,Choi, Won,Lee, Ho-Jae,Kim , Han-Joong,Lee , Jeong-Jae,Kim, Jong-Ok 한국농공학회 2004 한국농공학회논문집 Vol.46 No.5

Methodologies of the finite element and boundary element are combined to achieve an efficient and accurate analysis model of frame structure containing shear wall. This model analyzes the frame by employing the finite element method and the shear wall by boundary element method. This study is applicable to a specific situation, where the boundary element is surrounded by finite elements. By employing FE dominant method in which boundary stiffness matrix is transformed into finite element stiffness matrix, boundary element and finite element method are combined to analyze frame structure with walls.

창의적 학습동아리 활동을 통한 차세대 지식경영 구현사례: 포스코

최종진 ( Jong Jin Choi ),정남호 ( Nam Ho Chung ),조용말 ( Yong Mal Jo ) 한국지식경영학회 2008 지식경영연구 Vol.9 No.1

In the previous KM (Knowledge Management) studies, it has been repeatedly pointed that CoP (Community of Practice) should be used as a platform for boosting up corporate innovative activities. Despite this, it is very rare to find relevant literature in which real-world cases are introduced showing critical success factors, implemented strategies, and objective analysis of results. In this sense, main objective of this paper is very timely- to introduce a real-world CoP case in which POSCO, world-leading steel company, sorted out creative CoP strategies to nurture knowledge-sharing activities to solve various kinds of problems at hand, and maintain appropriate level of knowledge circulation throughout all the working units of company. In a nutshell, POSCO has been successful in any measure in utilizing the creative CoP activities as strategic means to change the paradigm of innovation and extract fruitful outcomes from integrating three important individual activities such as work, learning, and innovation.

남성에서 음주와 흡연이 동맥경화증 위험요소와 항산화체계에 미치는 영향

이종호(Jong Ho Lee),이현철(Hyun Chul Lee),허갑범(Kap Bum Huh),장양수(Yang Soo Jang),김오연(Oh Yeon Kim),권석주(Sock Ju Kwon),정남식(Nam Sik Chung) 대한내과학회 1999 대한내과학회지 Vol.56 No.4

N/A Objective : Upper-body fat distribution, hyperhomocysteinemia and a depletion in antioxidant status are considered risk factors for atherosclerosis and these factors are related to alcohol consumption and cigarette smoking. The purpose of this study was to determine the influence of alcohol consumption and smoking habits on cardiovascular risk factors in healthy men by using a cross-sectional design. Methods : Smokers were defined as heavy smokers when they smoked more than 15 cigarettes per day. Group subdivision of drinkers were none, moderate (10-25g alcohol/d) and heavy(>25g alcohol/d) alcohol consumption. Subjects were divided into 6 groups: non- drinker-nonsmoker(n=33), nondrinker-heavy smoker (n=11), moderate drinker-nonsmoker (n=46), moderate drinker- heavy smoker(n=33), heavy drinker-nonsmoker (n=14) and heavy drinker-heavy smoker(n=15). Adipose tissue and muscle areas were calculated from computed tomography scans made at four body levels, first and forth lumbar vertebrae, mid portion of thigh and calf. Fasting serum levels of lipids, proteins, hormones and antioxidants and plasma level of homocysteine were determined. Results : Heavy drinker-heavy smokers showed similar intake of daily calorie and protein to other groups and 65% of them supplemented their diet with synthetic vitamin preparation. Heavy drinker-nonsmokers(36g/d) consumed nearly twice as much alcohol as moderate drinkers(16-18g/d) and heavy drinker-heavy smokers (53g/d) nearly three times as much. In comparison with non and moderate drinker-heavy smokers, heavy drinker-heavy smokers smoked more cigarettes(19 vs 26 cigarettes/d, p<0.05). Although there were no differences among 6 groups in means of age, body mass index, blood pressure and serum GOT and GPT levels, heavy drinkers showed the highest mean value of waist to hip ratio and subcutaneous fat area at first and forth lumbar vertebrae. Heavy drinker-heavy smokers showed higher serum levels of triglyceride and HDL-cholesterol but lower serum levels of transferrin and IGF-1, compared with nondrinkers. Plasma homocysteine level was higher in heavy drinker-heavy smokers than in nondrinker- nonsmokers. Serum levels of β-carotene, cryptoxanthin and lycopene in heavy smokers or heavy drinkers showed a decrease by about 50% of those in men who did not drink and smoke and these levels were the lowest in heavy drinker-heavy smokers among 6 groups. Conclusion : Our results show that heavy alcohol consumption can result in abdominal obesity, hypertriglyceridemia and a decrease in serum carotenoid levels, even though it can cause an increase in HDL-cholesterol level. In addition, a further decrease in serum carotenoids and an increase in plasma homocysteine level in heavy drinker-heavy smokers indicate the increased risk for atherosclerosis in the simultaneous heavy consumption of alcohol and cigarette.

급성 견봉쇄골 관절 탈구에서 Hook 금속판을 이용한 내고정술의 임상적-방사선학적 결과

윤종필(Jong Pil Yoon),김재윤(Jae Yoon Kim),최준하(Jun Ha Choi),이현주(Hyun-Joo Lee),최혜연(Hye Yeun Choi),정남연(Nam Yun Chung),오주한(Joo Han Oh) 대한견주관절의학회 2013 대한견주관절학회 학술대회논문집 Vol.2013 No.3

스테비아잎 첨가량에 따른 무 피클의 품질 특성

최순남(Soon-Nam Choi),이근종(Kun Jong Lee),주미경(Mi-Kyoung Joo),정남용(Nam-Yong Chung) 동아시아식생활학회 2017 동아시아식생활학회지 Vol.27 No.3

농촌어메니티자원도 정보전략계획 수립을 위한 목표설정

서보환 ( Bo Hwan Seo ),정남수 ( Nam Su Jung ),김종옥 ( Jong Ok Kim ) 한국농촌계획학회 2006 농촌계획 Vol.12 No.2

농업용저수지 정비 및 수변개발에 관한 관리자 요구 조사 분석

이세희 ( Lee Se-hee ),정남수 ( Jung Nam-su ),김시운 ( Kim Si-woon ),김종옥 ( Kim Jong-ok ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-

This study analyzed manager's demand for equipments and waterside development directions of Agricultural reservoir. We investigated agricultural reservoir managers working in Korea rural community & agriculture corporation. Analysis results show that responses of ‘very affirmative’ and ‘affirmative’ about tourist facilities, parks, and roads in agricultural reservoir are 60.2% wheres response of ‘lack of facilities for multi-functionality of agricultural reservoir’ is 67.1%. Main reasons about lack of facilities are funds, environmental pollution but interruption of agricultural water supply (6.7%) is relatively small problems. This means that they have a intention for water-side development with conditions of prevention of technology of environment pollution and enough funds. Multi-functionality of agricultural reservoir and ordered by water supply, flood control, environmental conservation, and tourist resources. Water-side development is occurred by external demands like willings of local government (48.1%) and tourism (25%).