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나노 크기의 Fumed Silica가 함유된 Polysulfone 한외여과 중공사막 제조 및 내오염성 분석
김인수,강예솔,임주환 한국막학회 2018 멤브레인 Vol.28 No.6
본 연구에서는 한외여과 polysulfone (PSf) 중공사막에 첨가제를 섞는 방법을 통해 친수성 증가에 따른 분리막 특성 및 성능을 향상하고자 하였다. 15 nm 크기의 fumed silica (FS)를 0.1, 0.3, 0.5 wt%로 방사 용액에 분산시켜 혼합 매트릭스 분리막을 제조하였다. 단면 및 표면상태를 확인하기 위해 SEM 분석을 진행하였으며, FS가 함유될수록 중공사막의 평균 기공 반경이 4 nm 이상 증가하는 것을 확인하였다. 또한, 분리막의 친수성 분석을 위해 접촉각 측정을 진행하였으며, FS 함유로 분리막의 친수성이 높아진 것을 확인하였다. 수투과도의 경우 FS가 섞인 분리막은 91~96 LMH 수준을 보였으며 PSf분리막보다 5~11%의 증가율을 보였다. 내오염성 평가에서도 친수도가 상승한 FS 혼합 중공사막 표면에 소수성을 띄는 BSA가 흡착되지 못하여 상대 유량 감소율이 PSf 단일막 보다 낮아졌음을 확인하였다. This study was conducted to improve the membrane characteristics and performance by increasing hydrophilicity by adding additives to the ultrafiltration polysulfone (PSf) hollow fiber membrane. The mixed matrix membranes (MMMs) were prepared by dispersing 15 nm of fumed silica (FS) in the spinning solution at 0.1, 0.3 and 0.5 wt%. SEM analysis was carried out to confirm the cross-section and surface condition. It was confirmed that mean pore radius of the hollow fiber increased by 4 nm as FS was added. In addition, contact angle measurement was carried out for the hydrophilicity analysis of hollow fiber membranes, and it was confirmed that the hydrophilicity of MMMs were increased by adding of FS. In the case of water permeability, the membrane including FS showed 91~96 LMH and showed 5~11% more increase than PSf membrane. In the antifouling performance test, relative flux reduction ratios of FS mixed hollow fiber membranes were lower than that of PSf membranes, and it was confirmed that increase of hydrophilicity hinders adsorption of hydrophobic BSA on the membrane surface.
Military Organizational Cohesion and the 2006 Military Coup in Thailand
김인수,곽형신 육군사관학교 화랑대연구소 2010 한국군사학논집 Vol.66 No.1
The goal of this study is to demonstrate that strong intra-military cohesion has significantly enhanced the political strength of the military by binding military officers to military leadership. The elimination of military strongmen after the short-lived democratic period (1973-1976) apparently eroded the Thai military’s organizational coherence. Therefore, this study demonstrates two points: (1) the extent to which the Thai military effectively governs and controls society depends not only on the level of the society’s socioeconomic development but also on the political strength of the military; and (2) the political strength of the military to intervene in domestic politics varies according to the military’s organizational coherence in Thailand.
주조용 코발트기 초내열합금의 열처리에 따른 기계적 특성 변화
김인수,최백규,정중은,도정현,정인용,조창용 한국주조공학회 2018 한국주조공학회지 Vol.38 No.5
The effects of a heat treatment on the carbide formation behavior and mechanical properties of the cobalt-based superalloy X-45 were investigated here. Coarse primary carbides formed in the interdendritic region in the as-cast specimen, along with the pre- cipitation of fine secondary carbides in the vicinity of the primary carbides. Most of the carbides formed in the interdendritic region were dissolved into the matrix by a solution treatment at 1274oC. Solutionizing at 1150oC led to the dissolution of some carbides at the grain boundaries, though this also caused the precipitation of fine carbides in the vicinity of coarse primary carbides. A solution treatment followed by an aging treatment at 927oC led to the precipitation of fine secondary carbides in the interdendritic region. Very fine carbides were precipitated in the dendritic region by an aging heat treatment at 927oC and 982oC without a solution treat- ment. The hardness value of the alloy solutionized at 1150oC was somewhat higher than that in the as-cast condition; however, var- ious aging treatments did not strongly influence the hardness value. The specimens as-cast and aged at 927oC showed the highest hardness values, though they were not significantly affected by the aging time. The specimens aged only at 982oC showed out- standing tensile and creep properties. Thermal exposure at high temperatures for 8000 hours led to the precipitation of carbide at the center of the dendrite region and an improvement of the creep rupture lifetimes.
現代音樂의 變奏技法에 關한 考察 : A·Webern의 피아노를 爲한 變奏曲을 中心으로 Centered on A.Webern's Variation for Piano
金仁洙 群山大學校 1983 論文集 Vol.5 No.-
A variation in an opus means that it changes the theme and a melodic subject into tuneful, harmonic, rhythmic or characteristic mode, or as repeating the them and a melodic subject, a variation can be said to be a kind of repeat method. In a work of music repetition which plays a variation with decoration, technique and character essentially has an importance side in a language of music, so it has become a means of compositional construction by various modes and ways from a melodious variation of Gregorian chant to modern music. A. Webern wrote his work by the twelve-tone technique from op 17. Therefore the method of variation was the key subject in his compositional technique like his school-schonberg and Alban Berg. As A. Webern in op 27 composed a strict and logical variation by the use of his own twelvetone technique in one tone row, he lift a masterpiece of the twelvetone structure and atonality behind and showed his unique technique in a method of variation. In the process of development of Webern's twelve-tone technique and variation technique 1 summarize a character of his technique centered on op 27 and am to study a point of difference between variation in modern music and the technique of variation in a traditional mode. So variation by the twelve-tone technique will be the most important technique in modern music. That is, the twelve-tone music can not but become a kind of infinite variation, for an archetype of one tone row makes up a musical piece through various variations. Music of the twelve-tone itself has a constant variation in a tone row. In case of taking a mode of variation there is constructively a necessity for giving a function formed the parent of variation in essential aspects expect element of an interval. In A. Webern's op 27 a function formed the parent of variation had a form of a construction, Canon and counterpoint by a reflected image.