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이성근,정진오,김승규,정완진,Lee, Sung-Geun,Jung, Jin-Oh,Kim, Seung-Kyu,Chung, Wan-Jin 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
In the manufacturing of a LCD TV bottom chassis, the distortion after forming should be suppressed below pre-defined amount to avoid contact with electric components. Finite element analysis procedure of forming and springback of a LCD TV bottom chassis is developed to investigate the distortion behaviour. It is shown that after the first forming large distortion occur due to uneven metal flow induced by various embossings. In the second forming, distortion is decreased by introducing bead that absorbs the excessive metal flow. It is proved that analysis method could describe these behaviour effectively. The developed analysis method can be used to find the proper location and shape of bead more quickly and effectively.
변형 LIGA 공정을 통해 제작된 Microlens의 모델링 및 시뮬레이션
김동성,이성근,양상식,권태헌,이승섭,Kim, Dong-Seong,Lee, Seong-Geun,Yang, Sang-Sik,Gwon, Tae-Heon,Lee, Seung-Seop 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
In this paper, we present modeling and simulation of microlens formation by means of a deep X-ray lithography followed by a thermal treatment of a PMMA (Polymethylmethacrylate) sheet. According to this modeling, X-ray irradiation causes the decrease of molecular weight of PMMA, which in turn decreases the glass transition temperature and consequently causes a net volume increase during the thermal cycle resulting in a swollen microlens. In this modeling, the free volume theory including the relaxation process during the cooling process was considered. The simulation results indicate that the modeling in this study is able to predict the fabricated microlens shapes and the variation pattern of the maximum heights of microlens which depends on the conditions of the thermal treatment. The prediction model could be applied to optimization of microlens fabrication process and to designing a micro mold insert for micromolding processes.
Hemiballism-Hemichorea-Orofacial dyskinesia가 병발한 환자 치험 1례
손지영,윤효진,이성근,이병주,이기상,Son, Ji-Young,Yoon, Hyo-Jin,Lee, Seung-Geun,Lee, Byung-Ju,Lee, Key-Sang 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.4
Objectives: This study was to examine diagnosis of dyskinesia by criteria of oriental medicine and to evaluate the effect of oriental medical treatment on the symptoms. Methods: After the patient was treated with Yonggyedeunggyo-tang, the changes in dyskinetic symptoms were evaluated for treatment efficacy every hospital day. Results: The dyskinesia symptoms disappeared. Conclusions: Herbal medicine and Saam Acupuncture therapy is useful for the treatment of Hemiballism- Hemichorea-Orofacial dyskinesia patients.
토양 중의 비휘발성 산성 유기 Priority Pollutants 동시분석에 관한 연구
이승석,박교범,이성근,Lee, Seung Seok,Park, Gyo Beom,Lee, Seong Geun 대한화학회 1994 대한화학회지 Vol.38 No.3
The simultaneous analysis of 11 semi-volatile organic acid compound which are listed as priority pollutants by EPA, were performed by GC/MS-SIM(selected ion monitoring). Two extraction procedures, sonication extraction and Soxhlet extraction, were studied as an extraction and concentration method for priority pollutants in soil. Accurecy and precision of the methods were measured by the calculation of mean recovery, mean relative standard deviation, and method detection limit. Finally, limitations and prospects were discussed. 미국 환경청이 지정한 129종의 priority pollutants 중 11종의 비휘발성 산성 유기화합물을 대상물질로 선정하여 토양시료 중의 극미량 분석방법을 연구하였다. 분석방법으로 기체크로토그래프/질량분석기- SIM(selected ion monitoring)법을 검출방법으로 정하고, 토양시료의 추출 및 농축방법으로 사용한 초음파 추출법(sonication extraction)과 Soxhlet(Soxhlet extraction)을 비교 연구하였다. 각 화합물의 회수율, 상대표준편차 및 method detection limit를 측정하여 EPA분석법을 대체할 수 있는지의 가능성을 조사하였다.
청폐사간탕(淸肺瀉肝湯)을 투여한 중대뇌동맥영역의 뇌경색환자 치험 1례
윤효진,이재화,이선우,김영선,이성근,이기상,Yun, Hyo-Jin,Lee, Jae-Hwa,Lee, Sun-Woo,Kim, Sun-Young,Lee, Seung-Geun,Lee, Key-Sang 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.1
This study is clinical report of one patient on a middle cerebral artery territory infarction who improved with the administration of an herbal medication. We prescribed Chungpyesagan-tang to the patient, and then CAVI(cardio-ankle vascular index), NIHSS, and MBI were followed up 1, 2 and 3 weeks later. After 1, 2 and 3 weeks,, CAVI and NIHSS decreased and MBI increased. These findings suggest that Chungpyesagan-tang has an effect on improvement of neurologic deficit of MCA infarction.
오세진,김원욱,김성환,이성근,김종수,Oh, Sae-Gin,Kim, Won-Ouk,Kim, Seung-Hwan,Lee, Seung-Geun,Kim, Jong-Su 해양환경안전학회 2011 해양환경안전학회지 Vol.17 No.4
선박에 적재된 곡류, 철강재 등의 산적화물에 여러 가지 이유로 손상이 발생될 수 있다. 본 논문에서는 코일 운반선의 화물손상 원인 중 특히, 결로에 의한 손상과 그에 대한 방지대책에 대해 분석하고자 한다. 결로란 주위 온도가 이슬점 이하로 떨어져 물체 표면에 공기 중의 수증기가 물방울로 맺히는 현상을 말하며 일반적으로 실내외 온도차가 큰 건축물이나 선박의 화물창에서 많이 발생한다. 특히, 비슷한 시기에 기온차가 있는 전 세계를 운항하는 선박에서 흔히 발생할 수 있는 현상이다. 본 연구에서는 코일 운반선의 결로에 의한 화물손상 방지 대책에 대해 고찰하고 화물손상을 방지하기 위해 제습장치와 가열온풍장치를 병용하는 새로운 방법의 제안과 습도, 습기량, 제습장치 용량, 결로수량, 화물 및 공기와 외기의 온도 차이에 따른 화물창 내 공기와 화물 가열에 필요한 열량, 가열장치 용량 등의 산정법을 제시한다. Bulk cargo loaded into ship can be damaged by various kinds reasons. This paper aims to analyze about cargo damage of coil carrier ship due to condensation. Condensation is the formation of liquid drops of water from water vapor. Condensation consists of small drops of water which form when warm water vapour or steam touches a cold surface such as a window. In general, condensation have occurred by temperature difference at large building and ship's tank. It is phenomenon that can occur often to oceangoing vessel moving temperature difference places in similar time. This paper proposes a new method using dehumidification device and fan heater to prevent bulk cargo damage of coil carrier ship from condensation.
이진욱(Jin-Wook Lee),이승종(Seung-Jong Lee),김현진(Hyun-Jin Kim),이성근(Sung-geun Lee),김종현(Jong-Hyun Kim) 한국에너지기후변화학회 2010 에너지기후변화학회지 Vol.5 No.1
발전 플랜트 및 소각 플랜트의 연소실 해석 및 연소실 이후에 설치되는 배기가스 처리 장치에 대한 CFD 해석 사례 및 이를 산업체에서 이용하는 동향에 대하여 살펴보았다. 연소설의 경우 주로 운전 조건의 개선을 위한 목적, 보조 정치의 설계 또는 설계의 적합성 검증 목적으로 주로 CFD 해석 결과가 활용되고 있으며 원천 설계를 위한 목적으로 활용되는 경우는 적은 것으로 판단된다. 후처리 설비의 경우 초기에는 수동적인 의무 차원에서 CFD 해석을 수행하였으나 최근에는 자발적으로 성능 향상을 위한 목적으로 해석을 수행하는 경우가 잦아지고 있다. 최근에는 한국전력(주) 및 에너지 환경 분야의 산업체에서 이전에 비하여 CFD 해석을 수행하고 이를 설계에 반영하려는 움직임이 강해지고 있는 점으로 판단할 때, 향후 점진적으로 CFD 해석의 응용 범위 및 빈도수가 증가할 것으로 판단된다. 또한 현재는 보조 장치의 설계에 해석 결과를 응용하는 비중이 높지만 국내 에너지 환경 산업 분야의 기술 발전 및 해석 기술에 대한 관심도가 증대되는 경향을 고려할 때에 향후에는 점차 핵심 장치의 설계를 위한 목적으로 CFD 해석 결과를 응용하는 방향으로 점진적으로 이동할 것으로 판단된다. Recent trend of CFD analysis and its application to the energy & environmental industries, as a engineering point of view, bas been reviewed. It seems that most CFD analyses, for the combustion chamber of power plant or incineration plant, have been done for the improvement of operating condition or for the design of auxiliary equipment. These analyses are fairly research oriented. Whereas, in the field of flue gas treatment system design, CFD analyses have been performed to apply the result directly to the basic design. However most applications are fairly limited to the design of auxiliary equipments, rather than essential equipment. Considering the recent trend of technical development and the increase of interest for the application of CFD analysis, application range and frequency, especially for the design of essential equipment such as combustion chamber, would be increased in the short future.
박원일(Won Il Park),이종협(Jong Hyup Lee),조심현(Shim Hyun Jo),백봉력(Bong Luck Paik),최충경(Chung Keung Choi),이성근(Seung Geun Lee),문한규(Han Kyu Moon),최영미(Young Mee Choi),정윤석(Yoon Sok Jung),이관우(Kwan Woo Lee),김현만(Hyeon 대한내과학회 2002 대한내과학회지 Vol.62 No.3
N/A Background: There is increasing interest in the use of a very low calorie diet (VLCD) as a treatment regimen for weight loss in obese subjects. This study was designed to investigate the effect s and safety of a traditional Korean very-low-calory diet Methods: Twelve hospitalized obese patients at Dong Eui hospital in Busan city from May 1998 to December 1998 were selected. Height, body weight, blood lipids, blood insulin level, body fat, lean body mass, subcutaneous fat and visceral fat were measured. A traditional Korean VLCD was supplied for 14 days. Results: Patient's body weight was significantly decreased from 83.8 kg to 78.6 kg, body fat from 32.2 kg to 28.6 kg, lean body mass from 32.2 kg to 28.6 kg, and BMI from 31.4 to 29.5, respectively (p <0.05). Total fat was significantly decreased from 807 cc to 659 cc, subcutaneous fat from 567 cc to 473 cc, visceral fat from 273 cc to 185 cc, respectively. However there were no significant changes in minerals. After VLCD intervention, total cholesterol was significantly decreased from 199 mg/dL to 166mg/dL, HDL-cholesterol from 42 mg/dL, to 35mg/dL, triglyceride from 158mg/dL, to 75mg/dL (p<0.05). The insulin area under the curve was also significantly decreased from 205μIU/mL·2hr to 168 μIU/mL·2hr(p <0.05). Conclusion: Above findings suggested that a traditional Korean VLCD is effective and safe for short term use in terms of reducing body fat and improving insulin resistance in obese patients. (Korean J Med 62:250-257, 2002)