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좌주간부 관상동맥 에 관한 혈류역학적 분석 (LCCA) (II)
문수연(Su-Yeon Moon),장주희(Ju-Hee Jang),박정수(Jung-Su Park),신세현(Seh-Yun Shin) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The distributions of blood pressure, blood flow, and blow volume in the left common artery (LCCA)<br/> were determined using the lumping parameter method. In order to develop a mathematical model for<br/> microcirculation in LCCA, the present study adopted preexisted set of measured morphological data on anatomy,<br/> mechanical properties of the coronary vessels, viscosity of blood, the basic laws of physics, and the appropriate<br/> boundary condition. Pressures and volumes of blood and flow resistance were expressed in terms of<br/> electrical voltages, current, and resistances, respectively, in the electrical analog model. The results of two<br/> mathematical models, symmetrical and asymmetrical models, were compared with other investigator's data.<br/> The present results were in good agreement with previous studies. It was found that the mean pressure<br/> profiles were similar in both models.
참굴(Crassostrea gigas)의 패각운동을 이용한 생물모니터링 시스템 연구 (빈산소에서 홀 소자를 이용한 패각운동 측정)
전진영,문수연,오석진,Jeon, Jin-Young,Moon, Su-Yeon,Oh, Seok Jin 한국해양생명과학회 2016 한국해양생명과학회지 Vol.1 No.1
본 연구는 소형화된 홀 소자를 이용하여 국내 패류 양식 생물 중 가장 많은 생산량을 보이는 참굴(Crassostrea gigas)의 패각운동을 기초로, 연안역에서 빈산소에 대한 생물모니터링 시스템의 적용 가능성을 조사하였다. 정상상태 패각운동의 측정을 위해서 여과해수에서 측정한 결과, 참굴 개체는 평균 5~12 mm 정도의 개각상태를 유지하였으며, 패각운동 시 비교적 빠른 폐각상태를 보였다가 느린 속도의 개각상태의 운동이 관찰되었다. 하지만, 주·야간 사이에는 큰 차이가 없었다(p<0.05). 용존산소 농도를 7 mg l<sup>-1</sup>에서 3 mg l<sup>-1</sup>까지 감소시키면, 패각운동의 횟수는 증가를 나타내었으며, 파형도 정상상태와 다르게 불안정한 파형을 보였다. 또한 용존산소가 2 mg l<sup>-1</sup>로 감소된 후에는 패각운동의 크기가 점차 작아지거나, 폐각상태를 지시하는 파형이 관찰되었다. 이와 같은 생물모니터링 시스템을 패류 양식에 활용하여 빈산소와 같은 해양환경의 이상변동을 신속히 감지할 수 있다면, 어업피해를 감소시킬 수 있을 것으로 기대된다.
박판형 토러스를 갖은 자동차용 토크컨버터의 성능 최적화
이병철,신세현,김철,문수연,장재덕,주인식(Byung-chul Lee),Se-hyun Shin,Cheol Kim,Su-yeon Moon,Jae-duk Jang,In-sik Joo 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Automotive torque converters have recently been designed with an increasingly narrow profile for the purpose of achieving a smaller size, which also translates into savings. New torque converter with flatted torus was designed to compare with reference torque converter having circular torus. Flatted torus has non-axisymmetrical ellipticity and a trapezoid stator created by typical blade design method. To evaluate the overall performance, CFD code was used. The present numerical analysis was performed for the full three-dimensional turbulent flows. The torque ratio and Input capacity factor of Flatted torque converter were compared with reference model having circular torus and have been good agreement with it.<br/>
안희섭(Hee-Sub Ahn),손창현(Chang-Hyun Sohn),문수연(Su-Yeon Moon) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.2
A well-known pressure correction method, a SIMPLE algorithm, is extended to treat compressible flows. Collocated grids are used and density is linked to pressure via an equation of state. The influence of pressure on density in the case of compressible flows is implicitly incorporated into the extended SIMPLE algorithm. The first-order Upwind and high-order Quick scheme are compared with respect to an accuracy and convergence time at all speeds. The extended method is verified on a number of test cases and the results are compared with other numerical results available in the literature. The calculated results show that the Quick scheme improves accuracy at all speed and also reduces the calculation time at supersonic flows, compared with the Upwind scheme.
안희섭(Hee-Sub Ahn),손창현(Chang-Hyun Sohn),문수연(Su-Yeon Moon) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
A well-known pressure correction method, a SIMPLE algorithm, is extended to treat compressible flows. Collocated grids are used and density is linked to pressure via an equation of state. The influence of pressure on density in the case of compressible flows is implicitly incorporated into the extended SIMPLE algorithm. The first-order Upwind and high-order Quick scheme are compared with respect to an accuracy and convergence time at all speeds. The extended method is verified on a number of test cases and the results are compared with other numerical results available in the literature. The calculated results show that the Quick scheme improves accuracy at all speed and also reduces the calculation time at supersonic flows, compared with the Upwind scheme.