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A FRACTIONAL STEP MESHFREE POINT COLLOCATION METHOD FOR THE INCOMPRESSIBLE NAVIER-STOKES EQUATIONS
Yongsik Kim 한국산업응용수학회 2007 한국산업응용수학회 학술대회 논문집 Vol.2 No.1
A fractional-step point collocation method by meshfree approximation is presented for solving non-stationary incompressible Navier-Stokes equations. A single node set and auxiliary local points to each node point are used in the present study. In the momentum equations, the diffusion terms are discretized by a meshfree approximation FMLSRK(Fast Moving Least Square reproducing Kernel Approximation) on a given node set, while the inertia terms are discretized by using local points. In the pressure correction step, the divergence of intermediate velocity is calculated using local points which results local mass conservation. The Crank-Nicolson method is employed to the viscous and the convective terms for the second order accuracy in time stepping. The present numerical scheme is applied to several numerical experiments to prove its accuracy and efficiency.
A MESHFREE METHOD FOR THE UNSTEADY INCOMPRESSIBLE NAVIER-STOKES EQUATIONS
Yongsik Kim 한국산업응용수학회 2009 한국산업응용수학회 학술대회 논문집 Vol.2009 No.5
A fractional-step point collocationmethod is studied for solving unsteady incompressibleNavier-Stokes equations by using a meshfree approximation. A single node set is used in this study. In the predictor step, the diffusion terms and the convection terms are discretized by a meshfree approximation FMLSRK(Fast Moving Least Square reproducing Kernel Approximation) on a given node set. In the corrector step, the pseudo-pressure is calculated by means of the least square approach. The Crank-Nicolson method is employed to the viscous and the convective terms for the second order accuracy in time stepping. The present numerical scheme is applied to several numerical experiments to prove its accuracy and efficiency.
Yongsik Kim,Minkyung Bae,Woojoon Kim,Dongsik Kong,Hyun Kwang Jung,Hyungtak Kim,Sunwoong Kim,Dong Myong Kim,Dae Hwan Kim IEEE 2012 IEEE transactions on electron devices Vol.59 No.10
<P>A combination of the multifrequency <I>C</I>- <I>V</I> and the generation-recombination current spectroscopy is proposed for a complete extraction of density of states (DOS) in amorphous InGaZnO thin-film transistors (a-IGZO TFTs) over the full subband-gap energy range (<I>EV</I> ≤ <I>E</I> ≤ <I>EC</I>) including the interface trap density between the gate oxide and the a-IGZO active layer. In particular, our result on the separate extraction of acceptor- and donor-like DOS is noticeable for a systematic design of amorphous oxide semiconductor TFTs because the former determines their dc characteristics and the latter does their threshold voltage (<I>VT</I>) instability under practical operation conditions. The proposed approach can be used to optimize the fabrication process of thin-film materials with high mobility and stability for mass-production-level amorphous oxide semiconductor TFTs.</P>
Effect of Film Thickness on the Tribological Characteristics of Zdol Lubricant on Silicon Surface
Yong-Sik Kim,Ji-Chul Yang,Dae-Eun Kim 한국정밀공학회 2004 International Journal of Precision Engineering and Vol.5 No.1
In precision mechanical components that experience sliding, it is important to reduce the friction to minimize surface damage. Particularly, new lubrication methods are needed to reduce friction in silicon based micro-systems applications. In this work, the tribological characteristics of PFPE (Perfluoropolyether) Zdol lubricant on silicon were investigated based on the thickness of the film. The lubricant was coated on silicon wafer specimens by the dip coating method. It was shown that the friction coefficient as well as stiction decreased as the thickness of the film increased. The results of this work may be applied to improve the tribological performance of silicon based micro-system components.
Comparison of Proteome between Bacillary and Coccoid Form of Helicobacter pylori
( Yong Sik Kim ),( Hoon Jai Chun ),( Rok Son Choung ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Soon Ho Um ),( Sang Woo Lee ),( Jai Hyun Choi ),( Chang Duck Kim ),( Ho Sang Ryu ),( Sang Hoon Lee ),( Chang 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<Background> It is well known that H. pylori takes two forms depending on the environment and nutritional states. The conversion of bacillary to coccoid form occurs in the harsh environment, however the reverse is in question. In this study, the proteomes
Effects of EGF Receptor Antagonist (AG1478) on Helicobacter pylori Infected AGS Cells
( Yong Sik Kim ),( Hoon Jai Chun ),( Rok Son Choung ),( Yoon Tae Jeen ),( Chang Sub Uhm ),( Hong Sik Lee ),( Soon Ho Um ),( Sang Woo Lee ),( Jai Hyun Choi ),( Chang Duck Kim ),( Ho Sang Ryu ),( Jin Ha 대한내과학회 2003 대한내과학회 추계학술대회 Vol.65 No.10
Scanning Electron Microscopic Evaluation of Interaction between Helicobactor pylori and AGS Cells
( Yong Sik Kim ),( Hoon Jai Chun ),( Rok Son Choung ),( Yoon Tae Jeen ),( Chang Sub Uhm ),( Hong Sik Lee ),( Soon Ho Um ),( Sang Woo Lee ),( Jai Hyun Choi ),( Chang Duck Kim ),( Ho Sang Ryu ),( Jin Ha 대한내과학회 2003 대한내과학회 추계학술대회 Vol.65 No.10
Synthesis of Octopus Type Trimethylene Glycol β-D-glucopyranosides
Yong Sik Kim,John F Kadal 한국목재공학회 2013 목재공학 Vol.41 No.2
The octopus type oligo-droxypropylen glycol β-D-glucopyranosides were successfully synthesized in this studies: the sterospecific compound of ally1 2 3, 4 6-tetra O-acetyl- β-D-glucopyranosides , 1, was deacetylated with NaOMe in MeOH lead to ally1- β-D-glucopyranoside , 2, which was perallylated and followed by hydroboration and subsequent oxidation afforded, 3-hydroxy-propyl, 2, 3, 4, 6-tetraO, 3-hydroxy-propyl, - β-D-glucopyranoside , 4, As a result, not only allylpropylene glycol β-D-gulcopyranosides, (5, 7, and 9) but also hydroxypropylene glycol β-D-glucopyranosides (6, 8, and 10) were synthesized by repeated sequential perallyation follfwed by hydroboration/oxidation.