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소병찬,이창환,주영규,So, Byeong-Chan,Lee, Chang-Hwan,Ju, Young-Kyu 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.1
SAFE damper is a hybrid damper which is comprised of a friction damper and a metallic damper. These two dampers combine to resist external energy in stages. Under minor earthquake loads, the friction damper operates alone. However, the friction damper and metallic damper dissipate the energy together when a severe earthquake occurs. In comparison with other methods for seismic retrofitting, the SAFE damper has many advantages. The SAFE damper doesn't cause damage to facade of the building, and the construction period can be reduced when retrofitting. This paper describes experiments evaluating the structural performance of the SAFE damper. From the results, it was found that the structural performance of a conventional RC bare frame can be significantly improved by the installation of the SAFE damper.
소병찬,이창환,주영규 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.1
SAFE damper is a hybrid damper which is comprised of a friction damper and a metallic damper. These two dampers combine to resist external energy in stages. Under minor earthquake loads, the friction damper operates alone. However, the friction damper and metallic damper dissipate the energy together when a severe earthquake occurs. In comparison with other methods for seismic retrofitting, the SAFE damper has many advantages. The SAFE damper doesn’t cause damage to façade of the building, and the construction period can be reduced when retrofitting. This paper describes experiments evaluating the structural performance of the SAFE damper. From the results, it was found that the structural performance of a conventional RC bare frame can be significantly improved by the installation of the SAFE damper.
소병찬,이창환,주영규 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.1
SAFE damper is a hybrid damper which is comprised of a friction damper and a metallic damper. These two dampers combine to resist external energy in stages. Under minor earthquake loads, the friction damper operates alone. However, the friction damper and metallic damper dissipate the energy together when a severe earthquake occurs. In comparison with other methods for seismic retrofitting, the SAFE damper has many advantages. The SAFE damper doesn’t cause damage to façade of the building, and the construction period can be reduced when retrofitting. This paper describes experiments evaluating the structural performance of the SAFE damper. From the results, it was found that the structural performance of a conventional RC bare frame can be significantly improved by the installation of the SAFE damper.
高速度鋼의 機械的 性質에 미치는 mischmetal의 影響
高濟晩,蘇秉粲 조선대학교 생산기술연구소 1993 生産技術硏究 Vol.15 No.1
The effect of mischmetal addition on the mechanical properties of high speed tool steel has been investigated. The results obtained are as fallows. 1. Mischmetal addition is very effective for the crystal nucleatiou during steel sol idification, accordingly it results in smaller grain size. 2. Mischmetal addition resulted in globularization of carbide. 3. Toughness and hardness after tempering are improved by mischmetal addition, owing to its refining effect on the grain structure and the primary carbides. 4. Desulfurization was raised with increasing amount of mischmetal.
원영종,소병찬,우서휘,이동헌,김민호,남기범,임수진,심광보,남옥현 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
This study reports the effect of nitridation on the orientation of GaN layers grown on m-plane sapphire (Al2O3) substrates by hydride vapor phase epitaxy (HVPE). Non-polar (10-10) GaN layers were grown on m-sapphire without nitridation. With increasing nitridation time, the crystallographic phases of the GaN layer changed from non-polar to semi-polar (11-22) through mixed phases of (10-1-3) and (11-22). The phase change with nitridation was attributed to the formation of the nanosized AlN protrusions with slanted facets. This was confirmed by X-ray photoelectron spectroscopy and atomic force microscopy.