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물-공기 계면에서 긴 사슬 양 말단 작용기 분자인 α,ω-13,16-Dimethyloctacosanedioate Dimethylester(C_30DME)의 거동에 관한 연구
이정근,손대원,이관수,송석호,김현명,정선호 한양대학교 자연과학연구소 2001 自然科學論文集 Vol.20 No.-
물-공기 계면에서 표면압력의 증가에 따른 C30DME 분자의 구조 변화를 살펴보았다. 표면압력(π)-표면적(A) 등온선을 통해 표면적이 줄어들 때 C30DME 분자가 선형으로부터 역 U 자형 구조로 변하는 것을 확인하였다. C30DME의 역 U 자형 구조의 형성을 확인하기 위하여 Surface Plasmon Resonance (SPR)와 ellipsometry를 이용하여 Langmuir-Blodgett (LB) film 의 두께를 측정하였고 이 두께는 C30DME 분자의 역 U 자형 구조의 높이와 일치함을 관찰하였다. 또한 Atomic Force Microscope (AFM)을 이용한 표면 거침도 측정의 결과는 선형으로부터 역 U자형 구조로의 구조적 변화가 불연속이라는 것을 보여주었다. We investigated the conformational change of C30DME molecule with an increase on surface pressure at the air-water interface. The surface pressure (π)-area (A) isotherm indicates that the structure of C30DME changed from linear to reverse U-shape as the surface area was compressed. In order to confirm the formation of reverse U-shape, we examined the thickness of Langmuir-Blodgett (LB) film by a surface plasmon resonance (SPR) and an ellipsometry. The result of surface roughness measurement using an atomic force microscope (AFM) showed that the conformational change from linear to reverse U-shape is discontinuous.
Song, Myung-Kwan,Park, Jin-Su,Yoon, Mi-Kyoung,Yoon, Hoe-Won,Kim, Ae-Jin,Jin, Sung-Ho,Gal, Yeong-Soon,Lee, Jun-Hee,Lee, Jae-Wook 한국고분자학회 2010 Macromolecular Research Vol.18 No.11
Novel electroluminescent polymers, poly[N-(3,4-bis(decyloxy)phenyl)carbazolyl-2,7-vinylene)] (PCzV) and poly[N-(3,4-bis(decyloxy)phenyl)carbazolyl-2,7-vinylene)-co-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene}] (PCzV-co-MEH-PPV), which is a series of fully conjugated poly(N-dialkoxyphenylcarbazolyl-2,7-vinylene) derivatives with meta- and para-decyloxy phenyl moieties as a pendant group, were synthesized using the Gilch polymerization method. The resulting polymers were highly soluble in common organic solvents and could be easily spin-coated onto an indium-tin oxide coated glass substrate to obtain high quality optical thin films. The weight-average molecular weight ($M_w$) and polydispersity of PCzV and PCzV-co-MEH-PPV were $3.86{\times}10^4$ and 1.60 and $7.99{\times}10^4$ and 2.05, respectively. Organic light-emitting diodes (OLEDs) were fabricated with the following structures: ITO/PEDOT:PSS/emitting polymer/cathode configurations using either double-layer Ba/Al or triplelayer tris(8-hydroxyquinolinato)aluminum ($Alq_3$)/LiF/Al cathode structures. The maximum brightness and current efficiency were $5,965\;cd/m^2$ and 0.43 cd/A at 10 V.
Myung-Kwan Song,Yozo Fujino 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.4
In this study, the new three-dimensional finite element analysis model of guideway structures considering ultra high-speed magnetic levitation train-bridge interaction, in which the various improved finite elements are used to model structural members, is proposed. The box-type bridge deck of guideway structures is modeled by Nonconforming Flat Shell finite elements with six DOF (degrees of freedom). The sidewalls on a bridge deck are idealized by using beam finite elements and spring connecting elements. The vehicle model devised for an ultra high-speed Maglev train is employed, which is composed of rigid bodies with concentrated mass. The characteristics of levitation and guidance force, which exist between the super-conducting magnet and guideway, are modeled with the equivalent spring model. By Lagrange’s equations of motion, the equations of motion of Maglev train are formulated. Finally, by deriving the equations of the force acting on the guideway considering Maglev train-bridge interaction, the complete system matrices of Maglev train-guideway structure system are composed.
Song, Myung-Kwan,Noh, Hyuk-Chun,Kim, Sun-Hoon,Han, In-Seon Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.5
In this study, a new smart beam finite element is proposed for the finite element modeling of beam-type smart structures that are equipped with bonded plate-type piezoelectric sensors and actuators. Constitutive equations for the direct piezoelectric effect and converse piezoelectric effect of piezoelectric materials are considered in the formulation. By using a variational principle, the equations of motion for the smart beam finite element are derived. The proposed 2-node beam finite element is an isoparametric element based on Timoshenko beam theory. The proposed smart beam finite element is applied to the free vibration control adopting a constant gain feedback scheme. The electrical force vector, which is obtained in deriving an equation of motion, is the control force equivalent to that in existing literature. Validity of the proposed element is shown through comparing the analytical results of the verification examples with those of other previous researchers. With the use of smart beam finite elements, simulation of free vibration control is demonstrated by sensing the voltage of the piezoelectric sensors and by applying the voltages to the piezoelectric actuators.
Study on Material Transport across Novel Charged Mosaic Membrane
Song, Myung Kwan,Yang, Won Kang 동국대학교 2005 大學院硏究論集-東國大學校 大學院 Vol.35 No.-
하전 모자이크 막은 막 매트릭스 내에 서로 다른 두 가지 전하를 갖는 막으로 잘 알려져 있다. 양이온/음이온 전하의 나란한 배열을 가진 하전 모자이크 막의 몇몇 특성은 수송연구와 관련된 분석으로 조사하였다. 비평형 열역학을 기초로 한 염과 부피 플럭스의 분석으로부터, 하전 모자이크 막은 바닷물로부터의 탈염 혹은 염의 농축을 기대한다. 부가적으로, 본 연구의 우수성을 비교하기 위해, 도구야마 소다사의 상업적으로 시판되는 양이온교환막인 CMX와 음이온 교환막인AMX를 사용하였다.
Enhanced finite element modeling for geometric non-linear analysis of cable-supported structures
Song, Myung-Kwan,Kim, Sun-Hoon,Choi, Chang-Koon Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.5
Enhanced three-dimensional finite elements for geometrically nonlinear analysis of cable-supported structures are presented. The cable element, derived by using the concept of an equivalent modulus of elasticity and assuming the deflection curve of a cable as catenary function, is proposed to model the cables. The stability functions for a frame member are modified to obtain a numerically stable solution. Various numerical examples are solved to illustrate the versatility and efficiency of the proposed finite element model. It is shown that the finite elements proposed in this study can be very useful for geometrically nonlinear analysis as well as free vibration analysis of three-dimensional cable-supported structures.