Youngsang Cho

Analysis of Thermal Characteristics According to Semiconductor Package Structure and Application

Youngsang Cho, Won Sik Shin, Moonseob Jeong, Junso Pak et autres

A semiconductor packaging process is necessary to connect the semiconductor components to the applications that use them and the silicon chip. The chip is produced in various types of packages to meet the application requirements, and differences in the structure and materials …

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Ring-Opening Metathesis Polymerization of Thianorbornenes

Youngsang Cho, Yeram Kim, Jinwon Seo, Christopher W. Bielawski

A series of exo -7-thiabicyclo[2.2.1]hept-5-ene-2,3-dicarboximides were synthesized and polymerized using Schrock’s catalyst, 2,6-diisopropylphenylimidoneophylidene molybdenum(VI) bis(hexafluoro- tert -butoxide). The ring-opening metathesis polymerization (ROMP) reactions were found to proceed in a controlled manner, enabling chain extensions and tuning of polymer molecular weight. The polymers …

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N‐heterocyclic carbene copper complexes catalyze the C1 polymerization of substituted diazomethanes

Songsu Kang, Sherilyn J. Lu, Minyeong Cho, Youngsang Cho et autres

Abstract The C1 polymerization of substituted diazomethanes, including diazoethane and 2,2,2‐trifluoromethyl diazomethane, are reported. N‐heterocyclic carbene copper complexes were employed as catalysts for the polymerization reactions and afforded the corresponding persubstituted polymers containing methyl or trifluoromethyl units along the backbones of the …

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Economic Feasibility Analysis of xVDC Power System Considering Carbon Reduction Effect

Min-Joon Gam, Youngsang Cho

본 연구에서는 신재생발전을 직접 연계하는 고압직류(HVDC, High voltage direct current)와 중압직류(MVDC, Medium voltage direct current)를 대상으로 경제적 타당성 분석을 실시하였다. 본 연구에서는 이들 기술의 편익으로 신재생 연계, 전력 손실 저감, 그리고 탄소배출 저감효과를 고려하였고, 기술의 기여도를 반영하여 비용과 편익을 산정하여 2022년부터 2050년까지 …

Revealing the physical properties of chlorine-substituted poly(acetylene)

Youngsang Cho, Jinwon Seo, Sherilyn J. Lu, Songsu Kang et autres

Novel conjugated polymers were synthesized by polymerizing cis -3,4-dichlorocyclobutene followed by elimination.

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Nickel‐catalyzed polymerization of a substituted sulfoxonium ylide

Sherilyn J. Lu, Songsu Kang, Youngsang Cho, Minseok Choi et autres

Abstract The homopolymerization of (dimethylamino)phenylsulfoxonium ethylide, a substituted sulfoxonium ylide, is reported. Treatment of the monomer with a readily available Ni(II) catalyst afforded poly[(1‐butene)‐ran‐(2‐butene)‐ran‐(ethylene)] in good yield and high molecular weight. Varying the initial monomer‐to‐catalyst feed ratio enabled control over the molecular …

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Pattern Continuity Check Approach to Model Effective Thermal Conductivity of PCB

Youngsang Cho, Y. H. Hyun, Yunhyeok Im, Youngmin Shin

The size of semiconductor chip is getting smaller, and the power density is also increasing due to reduction of heat source size. Accurate thermal modeling of PCB, which is the primary heat conduction path of heat generated from a chip, is important …

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