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강수석,윤덕용 대한금속재료학회(대한금속학회) 1975 대한금속·재료학회지 Vol.13 No.3
The effect of cooling rate of sintering on the strength of sintered Fe-Cu has been studied. The copper conteet was varied between 0 and 12 weight %. The tensile test specimens were prepared by usual powder metallurgy techniques. The compacts were sintered at 1120℃ for 40 minutes in hydrogen atmosphere and cooled to room temperature at various cooling rates over several temperature ranges. The strength of specimens with more than 2% Cu increased greatly with increasing cooling rates between 850℃ and 600℃ the eutectoid transformation range. For 8% Cu, the ultimate tensile strengths for the fast cooled and slow cooled specimens were about 35 and 20 ㎏/㎟ respectively. This observation is explained by the decreasing size of the precipitated Cu-rich phase with fast cooling rate in the eutectoid transformation. For 2% Cu specimens, the strength increased with slow cooling rate below 600℃. This is attributed to the precipitation hardening effect of the Cu-rich phase. In general the strength of sintered Fe-Cu increased with copper content reaching the maximum strength for different Cu contents at various cooling rate. The effect of cooling rate on dimensional change was found to be negligible.
Sn- Bronze 계 마찰재료의 소결중 미세조직의 변화
김주완,송영두,강복석,강수석,강석중 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
The microstrure evolution of a 78.0 Cu-7.1 Sn-12.5 Fe-2.4 Pb(wt%) alloy, metal composition of a typical Cu-Sn base friction material, has been studied during pressure (1.5 Mpa) and pressureless sintering up to 810℃ for various times. Overall microstructural changes during sintering were found to be determined by the reaction between Cu and Sn. The Sn melts upon heating spread alone the capillaries leaving pores at their sites and form ε phase. The pores collapsed during subsequent pressure sintering at higher temperatures. Upon heating ε phase appeared to transform into γ and β phases, which remelted eventually by reverse peritectic reactions. Fores, however, formed again at the sites of the intermediate phases, when the sintering pressure was relieved in the temperature range of peritectic reactions. Remelting of the intermediate phases could thus enlarge the size of pores in Cu-Sn base materials. A good homogeneous microstructure was obtained after sintering at 810℃ for about 1 hr under 1.5 Mpa.
김성,신동희,김창오,강수석,이경원,김정길,최석호,황성원 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.4
Graphene quantum dots (GQDs) have been prepared by hydrothermal cutting of graphene sheets and subsequently doped with N atoms by using hydrazine treatment to study the effect of doping on the structural and the optical properties of the GQDs. The pyridinic N atoms, which were increased in number by hydrazine treatment, are bonded with C atoms at the edge of the GQDs, thereby making the GQDs not only larger but also n-type conductive with a concomitant reduction of the edge-related defects. The absorption band of GQDs is peaked at 300 nm, and after doping, they show an additional absorption peak at 354 nm, which originates from the impurity energy level formed by the N doping. The GQDs emit bright blue photoluminescence (PL) peaked at 418 nm, and after hydrazine treatment, the PL emission is redshifted by 15 nm and its decay becomes slower, resulting from the N-related impurity level.
비동기 에이전트 복제를 이용한 효율적인 이동 에이전트 복구 기법
변일수(Ilsoo Byun),강수석(Sooseok Kang),박태순(Taesoon Park) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
신뢰할 만한 이동 에이전트 시스템을 구축하기 위해서는 이동 에이전트의 결함 내성 기능이 중요하다. 지금까지 여러 결함 내성 기법이 제안되었는데, 그 중의 하나가 에이전트 복제 기법이다. 에이전트 복제는 검사점 기법에 비해 훨씬 나은 신뢰성을 제공하는 반면, 복제 에이전트의 이동과 동의 과정에 수반되는 부하가 시스템의 성능을 저하시킨다. 그러므로 본 논문에서는 비동기 에이전트 복제 기법을 제안한다. 이 기법에서는 에이전트를 비동기적으로 전송하며 동의 과정을 위해 뒤늦게 전송되는 복제 에이전트를 기다리는 것이 아니라 고정된 동의 전용 에이전트를 사용하여 동의 과정의 비용을 감소시킨다. 제안된 기법은 Aglet 시스템 상에 구현되었으면, 실험 결과 제안된 기법을 사용할 경우 35%-69%의 성능 향상을 얻을 수 있었다.
윤재건(Jae Kun Yoon),홍호연(Ho Yeun Hong),이정우(Jeong Woo Lee),김종표(Jong Pyo Kim),강수석(Su Sok Kang) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Disposal of highly toxic wastes like polychlorinated biphenyls (PCBs) is very difficult. These substances create a growing mountain of problematic waste that has to be disposed properly. Conventional technologies that are based on common burning(rotary kiln, ~1100℃) and plasma technology(~10000℃) do not satisfy important conditions, for example, complete combustion of the toxic waste and the price of waste disposal. The combustor like a rocket engine is operated at relatively high pressure(~15 bar) and relatively high temperature(>3000℃) that are ideal for the complete destruction of extremely toxic substances. In this study, test compound(o-DCB) was dissolved in kerosine with a concentration of 10%. Pure gas oxygen was used as an oxidant. Analysis showed that the destruction efficiency achieved for o-DCB was 99.9999% or better. The results show that a combustor based on liquid propllant rocket technology is a validated tool for the disposal of highly toxic waste, and a good alternative technology when applied to the destruction of extremely toxic wastes.