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Hongchul Jeong,Kyutae Han 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.1
In the present study, the effect of aluminum, silicon, and nitrogen content on the microstructure and toughness of the weld heat affected zone (HAZ) of tensile strength, 400-500㎫ grade steels was investigated. The change in phase fraction, precipitate distribution as a function of peak temperature and cooling time were analyzed to clarify the effect of each alloying element on the microstructural changes and toughness of the weld HAZ. The optimal aluminum, nitrogen, and silicon content was determined by impact toughness and the microstructure of the simulated coarse grained heat affected zone (CGHAZ) concerning appropriate ferrite and bainite fraction, minimization of a cementite, a martensite-austenite (M-A) constituent distribution, and free nitrogen in a matrix.
A SHAPE OPTIMIZATION METHOD USING COMPLIANT FORMULATION ASSOCIATED WITH THE 2D STOKES CHANNEL FLOWS
Kim, Hongchul The Kangwon-Kyungki Mathematical Society 2008 한국수학논문집 Vol.16 No.1
We are concerned with a free boundary problem for the 2D Stokes channel flows, which determines the profile of the wing for the channel, so that the given traction force is to be distributed along the wing of the channel. Using the domain embedding technique, the free boundary problem is transferred into the shape optimization problem through the compliant formulation by releasing the traction condition along the variable boundary. The justification of the formulation will be discussed.
Plasmonic nano-comb structures for efficient large-area second harmonic generation.
Sim, Hongchul,Lim, Hee-Jin,Song, Jung-Hwan,Kim, Myung-Ki,Lee, Yong-Hee Optical Society of America 2014 Optics express Vol.22 No.14
<P>We propose and demonstrate plasmonic nano-comb (PNC) structures for efficient large-area second-harmonic generation (SHG). The PNCs are made of 250 nm-thick gold film and have equally-spaced 30 nm-slits filled with ployvinylidene fluoride-co-trifluoroethylene (P(VDF-TrFE)). The PNC with 1.0 μm-spacing couples resonantly with 1.56 μm 100-fs laser beams. For the 1.0 μm-spacing PNCs under the fixed-pump-power condition, the nonlinear SHG power remains almost independent of the pump diameter ranging from 2 μm to 6 μm. The SHG power from the resonant PNC is measured to be 8 times larger than that of the single-nano-gap metallic structure, when the pump beam is tightly-focused to 2 μm in diameter in both cases. This relative enhancement of the total nonlinear SHG signal power reaches up to >200 when the pump beam diameter is increased to 6 μm. We attribute this unusual phenomenon to the resonant coupling of the finite-size pump wave with the finite-size one-dimensional plasmonic mode.</P>
ON THE SHAPE DERIVATIVE IN THE DOMAIN INCLUSION
Kim, Hongchul The Kangwon-Kyungki Mathematical Society 2002 한국수학논문집 Vol.10 No.1
The shape derivative for the domain functional will be discussed in the situation of domain inclusion. Hadamard's shape structure is sought by using the material derivative in conjunction with the domain imbedding technique.