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김소희(S.H. Kim),정용수(Y.S. Jung),권오준(O.J. Kwon) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.2
The aim of the present study is to investigate the flow interference between two adjacent undulating fish-like body, and its effect on the undulating propulsion. For this purpose, unsteady two dimensional incompressible flow calculations were conducted using an unstructured mesh flow solver, coupled with an overset mesh technique. To deal with mesh deformation due to fish locomotion, spring analogy is utilized. The fish body used in the simulation is constructed from the NACA0012 airfoil. The study indicates that the propulsion of undulating fish is proportional to frequency and wavelength of the midline oscillation when there is no adjacent fish. It also reveals that average thrust was increased when the vortex shedding from the tail was conserved well and pressure difference between upper and lower sides of the fish was magnified due to flow interference. From this study, which relative position and phase difference of locomotion between two fishes can generate maximum thrust was known among six different cases.
김성균(S.K. Kim),김소희(S.H. Kim),정강수(K.S. Jeong),장지원(J.W. Chang) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
The three main physiological functions of nose are air-conditioning, filtering and smelling. Knowledge of airflow characteristics in nasal cavities is essential to understand the physiological and pathological aspects of nasal breathing. In our laboratory, there have been a series of experimental investigations on the nasal airflowin normal and deformed nasal cavity models by PIV under both constant and periodic flow conditions. In thisarticle airflow inside nasal cavity with maximal sinus is investigated both experimentally by PIV and numerically by the FVM general purpose code. Thin sliced CT data and meticulous refinement of model surface under the ENT doctor’s advice provided more sophisticated nasal cavity models. We also introduced asemi-automatic segmentation technique to reconstruct accurate three dimensional computer models from CT data rapidly and conveniently. The model is created by the combination of Rapid Prototyping and solidification of clear silicone. The Network-based communication system between multi-researchers and medical doctors is established for making the post-surgery models and discussions for surgery plans.
새로운 poly(acrylonitrile-itaconate)공중합체를 기초로 한 젤-전해질의 특성
최병구,김소희,공명선,Choi B. K.,Kim S. H.,Gong M. S. 한국전기화학회 2000 한국전기화학회지 Vol.3 No.3
Polyacrylonitrile (PAN) 고분자의 유기용매 함유능을 증대시키기 위하여 PAN을 수정한 새로운 polyacrylonitrile-co-bis[2-(2-methoxyethoxy)ethyl]itaconate (PANI로 약칭) 공중합체를 합성하였다. PAN과 PANI의 혼합 고분자에 ethylene carbonate (EC)와 dimethyl carbonate (DMC)의 혼합유기용매, $LiClO_4$ 염을 혼합한 젤 고분자 전해질을 제조하였다. 상온에서의 이온전도도는 25PAN +10PANl +50EC/DMC+$15LiClO_4$ 조성의 전해질에서 $2\times10^{-3}\; Scm^{-1}$로 가장 높은 값을 나타내었다. 이는 PANI의 혼합으로 인하여 유기용매 영역의 결정질 성분이 줄어들고, 따라서 전하운반자의 수가 증가하기 때문인 것으로 분석하였다. PANI를 고분자 기질로 적당량 첨가하면, PAN만을 단용으로 사용한 젤-전해질에 비해 기계적 강도가 감소하는 단점이 있기는 하지만, 이온전도성, 열적 특성, 용매와의 혼화성, 전기화학적 안정성, 리튬 전극과의 계면 안정성 등 거의 모든 면에서 성능이 개선되는 것으로 나타났다. A new gel polymer electrolyte based on the modified polyacrylonitrile (PAN), polyacrylonitrile-co-bis[2-(2-methoxyethoxy)ethyl]itaconate (abbreviated as PANI) copolymer was synthesized in expectation of enhanced trapping ability of liquid electrolytes. PAN and PANI blend was complexed with organic solvents, ethylene carbonate (EC) and dimethyl carbonate (DMC), and $LiClO_4$ salt. The highest room temperature conductivity of $2\times10^{-3}\;Scm^{-1}$ was found for a film of 25PAN+10PANl+50EC/DMC+$15LiClO_4$. The solvent-rich crystalline part decreases due to the blending of PANI and therefore number of charge carriers increases giving higher ionic conductivity. The addition of PAM as a host polymer in the PAN-based gels has beneficial effects such as higher ionic conductivity, better thermal characteristics, better miscibility with solvent, wider electrochemical stability, and better interfacial stability with lithium electrode, though it exhibits slightly less mechanical rigidity.