Tae-Sik Cho

Kyungpook National University

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Changho Yun

Korean Register (South Korea)

Kiseon Kim

Gwangju Institute of Science and Technology

Sae-Heum Park

Kyungpook National University

Joo-Hyeon Jeong

Kyungpook National University

jiwook Jeung

Jang-Hyeong Lee

Kyungpook National University

Wansu Lim

Sungkyunkwan University

Chul-Sik Cho

Kyungpook National University

Nan-Nan Liang

Kyungpook National University

Min-Soo Yi

Cooperative Institutions

Gwangju Institute of Science and Technology

Kyungpook National University

Korea University

Seoul National University

Hanyang University

Korean Register (South Korea)

Korea Advanced Institute of Science and Technology

Korea Institute of Science and Technology

Inha University

Korea Institute of Geoscience and Mineral Resources

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Annealing Behaviors of Al and Al–Mg–Si Alloy: A Real-Time Synchrotron X-ray Scattering Study

Journal of Nanoscience and Nanotechnology (2021)

Nan-Nan Liang Sae-Heum Park Tae-Sik Cho Seong-Goo Han

We have studied the annealing behaviors of pure Al (Al-1050) and Al–Mg–Si alloy (Al-6061) with plate-type using a real-time synchrotron X-ray scattering in vacuum. At room temperature (RT), the crystal domain size of Al phase in the Al–Mg–Si alloy was small as 70 nm, compared to that in the pure Al, 142 nm. The crystal Al phase in the Al–Mg–Si alloy has more thermal stability than that in the pure Al. The crystal Al phase in the Al–Mg–Si alloy was thermally stable in amount and size up to 250 °C. These are due to the existence of intermetallic crystal Mg 2 Si phase, which is thermally stable in amount and size up to 250 °C.

Crystal (programming language)

Thermal Stability

10.1166/jnn.2021.18942

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Effects of Ag on the Characteristics of Sn-Pb-Ag Solder for Photovoltaic Ribbon

Journal of the Korean Institute of Electrical and Electronic Material Engineers (2015)

Yeon-Su Son Tae-Sik Cho

We have studied the effects of Ag on the characteristics of $Sn_{60}Pb_{40}Ag_x$ (wt%) solder for photovoltaic ribbon. Ag atoms in the solder formed an alloy phase of $Ag_3Sn$ after reacting with some part of Sn atoms, while they did not react with Pb atoms, but decreased the mean size of Pb solid phase. The enhancement of peel strength between solar cell and ribbon is an important part in the developments of long-lifespan solar module. The peel strength of the solder ribbon of $Sn_{60}Pb_{40}$ (wt%) was $169N/mm^2$, and it was largely enhanced by adding a small amount of Ag atoms. The maximum peel strength was $295N/mm^2$ in the solder ribbon of $Sn_{60}Pb_{40}Ag_2$ (wt%). This result is caused by the high binding energy of 162.9 kJ/mol between Ag atoms in the solder and Ag atoms in Ag sheet.

Ribbon

10.4313/jkem.2015.28.5.332

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ODSB and OSSB Error Performance Analysis of MMoF Systems in Rician Fading Channel

대한전자공학회 학술대회 (2003)

Changho Yun Tae-Sik Cho Kiseon Kim

Rician fading

Error Analysis

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On the Nature of Various Growth Facets at the Interfaces of Gold Catalyzed-Silicon Nanowires

Journal of Nanoscience and Nanotechnology (2013)

Tae-Sik Cho Gyeong S. Hwang

Modified embedded atom method-molecular dynamics simulations have been performed to define the various growth facets at the interfaces of Au catalyzed-silicon nanowires (SiNWs). The interfacial growth facet of Au/SiNW on c-Si (111) surface has a single, planar interface, that grows parallel to the Si (111) planes. The interfacial growth facet on c-Si (211) surface has an asymmetrical, cone shape. The interface of Au/SiNW consists of two planes--the greater being {111} and the lesser being {100} planes. And finally the interfacial growth facet on c-Si (110) surface has a symmetrical, cone shape. The interface consists of two {111} planes. These findings exhibit good agreement with the previous experimental observation done with cross-sectional high-resolution transmission electron microscopy. We also predict the interfacial growth facet of Au/SiNW with NW direction (100), explaining that such a direction rarely exists due to geometrical limitations. We propose that changes in SiNW direction are caused the existence of various growth facets at the Au/SiNW interfaces.

Facet (psychology)

Faceting

10.1166/jnn.2013.7287

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Phase Transformation of Sn-Pb-Bi Solder for Photovoltaic Ribbon: A Real-time Synchrotron X-ray Scattering Study

Transactions on Electrical and Electronic Materials (2014)

Tae-Sik Cho

Ribbon

Supercooling

Crystal (programming language)

Atmospheric temperature range

10.4313/teem.2014.15.3.155

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Citations (2)

Thickness Dependence of the Crystallization of Au/Glass Ultrathin Films

Journal of Nanoscience and Nanotechnology (2013)

Tae-Sik Cho Jin-Woo Kim

The crystallization of Au/glass ultrathin films for surface plasmon resonance (SPR) biosensor has been studied using synchrotron X-ray scattering and field emission scanning electron microscope. In films thinner than 30 nm, crystallized Au grains with [111] preferred orientation were formed in the as-deposited amorphous precursor. In film with 58-nm thickness, however, Au (200) powder grains existed on top of the Au (111)-oriented grains near the interface. At the annealing temperature of 400 degrees C, the Au (200) powder grains disappeared, while the Au (111)-oriented grains grew further. The behavior of the surface morphology of Au thin films post-annealed at 400 degrees C was consistent with the thickness dependence of the crystallization. In a 10-nm-thick film, the Au (111)-oriented grains fully crystallized, and then became separated with each other. By increasing to 30-nm film thickness, the Au (111)-oriented grains grew further, coalesced into large columnar-type grains, and showed smooth surface. We suggest that the appropriate thickness of Au/glass thin film for SPR biosensor need over 30-nm-thick, considering smooth surface.

10.1166/jnn.2013.7282

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Optimization of Radio-on-Fiber Systems Employing ODSB Signals by Utilizing a Dual-Electrode Mach-Zehnder Modulator against IM3

ICEIC : International Conference on Electronics, Informations and Communications (2006)

Tae-Sik Cho Changho Yun Jintae Park Hyunju Lee Kiseon Kim

Electro-optic modulator

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Effects of Cu Wire's Shape on the Plating Property of Sn-Pb Solder for Photovoltaic Ribbons

Transactions on Electrical and Electronic Materials (2014)

Tae-Sik Cho Munseok S. Chae Chul-Sik Cho

Plating (geology)

10.4313/teem.2014.15.4.217

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Modified BER Estimation of Optical Link Considering the Nonlinear Effect of the Fiber

한국통신학회 학술대회논문집 (2001)

Tae-Sik Cho Seung-Geun Kim Kiseon Kim

Link (geometry)

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Performance analysis of MMoF systems considering laser phase noise under Rician fading

Changho Yun Tae-Sik Cho Seokjin Sung Kiseon Kim

The average bit error rate of a millimeter-wave over fiber (MMoF) system is numerically analyzed considering a laser phase noise under Rician fading. In an optical link of the MMoF system, an optical single side band (OSSB) signal is generated to reduce power degradation due to fiber chromatic dispersion and a direct detection is employed for cost-effectiveness. In a wireless link, a coherent detection is adopted since a phase fluctuation can be tracked for a small phase noise. The results show that the influence of the laser phase noise due to a laser diode (LD) with the linewidth of 642 MHz such as a Fabry-Perot (FP) LD on the MMoF system is negligible when the fiber length of 4 km for a macro cellular system and a millimeter-wave frequency of 28 GHz for a local multipoint distribution system (LMDS) are employed under the Rician factor K of 8 dB.

Rician fading

10.1109/mwsym.2004.1335912

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Citations (1)