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Lee, S.,Choi, S.T.,Earmme, Y.Y. Elsevier 2006 International journal of solids and structures Vol.43 No.11-12
<P><B>Abstract</B></P><P>This paper presents an analysis of a single vertical crack and periodically distributed vertical cracks in an epitaxial film on a semi-infinite substrate where the cracks penetrate into the substrate. The film and substrate materials have different anisotropic elastic constants, necessitating Stroh formalism in the analysis. The misfit strain due to the lattice mismatch between the film and the substrate serves as the driving force for crack formation. The solution for a dislocation in an anisotropic trimaterial is used as a Green function, so that the cracks are modeled as the continuous distributions of dislocations to yield the singular integral equations of Cauchy-type. The Gauss–Chebyshev quadrature formula is adopted to solve the singular integral equations numerically. Energy arguments provide the critical condition for crack formation, at which the cracks are energetically favorable configurations, in terms of the ratio of the penetration depth into the substrate to the film thickness, the ratio of the spacing of the periodic cracks to the film thickness, and the generalized Dundurs parameters between the film and substrate materials.</P>
윤재성(Jae Sung Yoon),유영은(Yeong-Eun Yoo),전은채(Eun-chae Jeon),최두선(Doo-Sun Choi),서재원(Jai Won Seo),김선경(Sun-Kyoung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A novel fabrication process for micro patterns has been introduced in this paper. The basic principle for fabrication of patterns is the superposition of geometries of micro structures on silicon substrate and those of the layer which is coated on the substrate. Due to the surface tension of the liquid in micro scale, various shapes of meniscus can be made on the micro structures. In this study, micro channels have been made on the silicon substrate in advance, then liquid layer has been coated on the structure. From the nature of liquid behavior, curved patterns with smooth surface have been obtained, which cannot be made easily with the conventional mechanical machining, as well as with the microfabrication processes, such as wet and dry etching.
Kim, S.,Hahn, J.S. Elsevier Science Publishers 2014 Journal of biotechnology Vol.192 No.1
Substrate channeling is a process of transferring an intermediate from one enzyme to the next enzyme without diffusion into the bulk phase, thereby leading to an enhanced reaction rate. Here, we newly designed substrate channeling modules in Saccharomyces cerevisiae based on a high affinity interaction between dockerin and cohesin domains, which is a key process in the formation of cellulosome structure. Synthetic scaffolds containing two, three, or seven cohesin domains were constructed, and the assembly of dockerin-tagged proteins onto the scaffolds was confirmed by pull-down assay and bimolecular fluorescent complementation (BiFC) assay in vivo. This system was applied to produce 2,3-butanediol in S. cerevisiae by using dockerin-tagged AlsS, AlsD, and Bdh1 enzymes, resulting in a gradual increase in 2,3-butanediol production depending on the number of cohesin domains in the scaffold.
Kee-Yeol Na,Ki-Ju Baek,Jun-Kyu Kim,Dongwon Kim,Nam-Soo Kim,Yeong-Seuk Kim Institute of Electrical and Electronics Engineers 2014 IEEE transactions on electron devices Vol. No.
<P>An n-channel MOSFET with lateral asymmetric substrate doping (LASD) is presented in this paper. The proposed LASD device has a p-well on the source side and a p-substrate on the drain side. The LASD MOSFET was designed by the simple p-well layout approach and fabricated using the 0.18 μm standard low-voltage CMOS process without any process modification. The experimental measurements showed the improved analog performances of the LASD MOSFET: higher transconductance (gm), lower drain conductance (gds), lower drain induced barrier lowering, higher transconductance generation factor (gm/I<SUB>D</SUB>), and higher Early voltage (V<SUB>EA</SUB>). In addition, the LASD device showed strong body-effect immunity: smaller V<SUB>T</SUB> shift according to body bias and lower body bias sensitivity factor (gmb/gm).</P>
Park Kyung Sun,Baek Jangmi,Koo Lee Yong-Eun,Sung Myung Mo 나노기술연구협의회 2015 Nano Convergence Vol.2 No.4
We report the fabrication and electrical characterization of a wafer-scale array of organic complementary inverters using single-crystal 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN) and fullerene (C 60 ) nanowires as p - and n -channels, respectively. Two arrays of single-crystal organic nanowires were generated consecutively on desired locations of a common substrate with a desired mutual alignment by a direct printing method (liquid-bridge-mediated nanotransfer molding). Another direct printing of silver micron scale structures, as source and drain electrodes, on the substrate with the two printed nanowire arrays produced an array of complementary inverters with a bottom gate, top contact configuration. Field-effect mobilities of single-crystal TIPS-PEN and C 60 nanowire field-effect transistors (FETs) in the arrays were uniform with 1.01 ± 0.14 and 0.10 ± 0.01 cm 2 V −1 s −1 , respectively. A wafer-scale array of complementary inverters produced all by the direct printing method showed good performance with an average gain of 25 and with low variations among the inverters.
Effect of shear stress on the formation of bacterial biofilm in a microfluidic channel
박애리,정헌호,이진태,김근필,이창수 한국바이오칩학회 2011 BioChip Journal Vol.5 No.3
Biofilms form an irregular network matrix that is surrounded by extracellular polymeric substrate (EPS). The architecture of biofilm plays an important role in protecting bacteria under physical, chemical, and biological stress. The shear stress is one of the major factors to construct stable bioflim. The experimental observation of biofilm formation on large-scale water flow has been limited because most of fluid pipe are water and sewer lines. This study presents the biofilm formation in a PDMS-based microfluidic channel which is able to simulate fluid pipes at small scale. We could characterize the hydrodynamics of the growth of single-species bacteria between biofilm formation and the external environmental factors. Particularly, the dynamics of biofilm formation confirms that biofilm, under the optimum shear stress, efficiently form a stable EPS structure which provides a mechanical shield against high-pressure fluidic flow.