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C-S-H계 조강제 첨가에 따른 혼합시멘트의 조기 강도 발현 특성
안태윤 ( An Tae-yun ),라정민 ( Ra Jeong-min ),박준형 ( Park Jun-hyung ),김진만 ( Kim Jin-man ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
In order to realize carbon neutrality in the international society, research on supplementary cementitious materials(SCMs) has been actively conducted as a way to reduce carbon dioxide emissions in the cement industry. However, the use of SCMs causes problems of initial hydration delay and strength reduction due to the reduction of tricalcium silicate(C3S) in the cement clinker. Therefore, in this study, the initial hydration and basic characteristics of cement mortar were confirmed by adding a C-S-H based hardening acceleration to blended cement mixed with Portland cement, blast furnace slag, fly ash, and limestone power. As a result of the heat of hydration and compressive strength test, it was confirmed that when hardening acceleration was added, the initial reactivity was high, so the heat of hydration was promoted, and the initial strength was increased. It is considered to be due to C-S-H seeding effect. Therefore, it is judged that the use of C-S-H based hardening acceleration can supplement the problem of initial hydration delay of blended cement in Korea.
3차원적 전류 흐름을 고려한 FinFET의 기생 Source/Drain 저항 모델링
안태윤(TaeYoon An),권기원(Kee-Won Kwon),김소영(SoYoung Kim) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.10
본 논문에서는 RSD(Raised Source/Drain)구조를 가지는 FinFET에서 3차원적 전류 흐름을 고려한 소스와 드레인의 해석적 저항모델을 제시한다. FinFET은 Fin을 통해 전류가 흐르기 때문에 소스/드레인의 기생저항이 크고 채널을 포함한 전체저항에서 중요한 부분을 차지한다. 제안하는 모델은 3차원적 전류흐름을 고려하여 contact부터 channel 직전 영역까지의 소스/드레인 저항을 나타내며 contact저항과 spreading저항의 합으로 이루어져 있다. Contact저항은 전류의 흐름을 고려한 가이드라인을 통해 작은 저항의 병렬합으로 모델링되고 spreading저항은 적분을 통해 구현했다. 제안된 모델은 3D numerical solver인 Raphael의 실험결과를 통해 검증했다. 본 연구에서 제안된 기생저항 모델을 BSIM-CMG와 같은 압축모델에 구현하여 DC 및 AC 성능 예측의 정확도를 높일 수 있을 것이다. In this paper, an analytical model is presented for the source/drain parasitic resistance of FinFET. The parasitic resistance is a important part of a total resistance in FinFET because of current flow through the narrow fin. The model incorporates the contribution of contact and spreading resistances considering three-dimensional current flow. The contact resistance is modeled taking into account the current flow and parallel connection of dividing parts. The spreading resistance is modeled by difference between wide and narrow and using integral. We show excellent agreement between our model and simulation which is conducted by Raphael, 3D numerical field solver. It is possible to improve the accuracy of compact model such as BSIM-CMG using the proposed model.
전로슬래그의 콘크리트용 골재로서 활용을 위한 팽창유발 물질 선별 연구
최선미 ( Choi Sun-mi ),라정민 ( Ra Jeong-min ),강인규 ( Kang In-gyu ),안태윤 ( An Tae-yun ),김진만 ( Kim Jin-man ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
The use of converter slag as an aggregate for concrete is limited due to the risk of expansion. This study analyzed the substances causing the expansion of converter slag and evaluated the possibility of its use as an aggregate for concrete through separation and selection. As a result of the experiment, it was confirmed that CaO and MgO were concentrated in the slag particles inducing expansion, and it was confirmed that it was possible to separate them from non-expanded particles through magnetic.
安泰潤 경북대학교 공과대학 1976 工大硏究誌 Vol.5 No.-
This study is to sugges a way of improving the models of technical manpower development plan in Korea by looking into the demerits of its current system. From the writers investigation, the present models largely rely on vocational schools and colleges for recruiting technical manpower. This is considered to be an undesirable method for our government to employ. The writer, therefore, suggest a more ideal model which comprises the secodary channels as well as the first ones. There is no doubt that the National Qualification Examination System has so far made a greate contribution to the enhancement of the tecnicians' qualification and their social status, and it has also improved the education of vocational schools. However, it has been one of the causes to bring forth an unhappy atmospher where almost all the vocational schools exert themselves to prepare the students only for the examination during the academic years. In order to inprove this unfavorable condition the writer suggests the ideal number of subjects to be tested on and the method of administering the examination.