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RC 구조물의 균열 보수용 폴리머 시멘트 복합체의 점도와 유동성에 관한 연구
홍대원 ( Hong¸ Dae-won ),김상혁 ( Kim¸ Sang-hyuk ),권우찬 ( Kwon¸ Woo-chan ),조영국 ( Jo¸ Young-kug ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
The purpose of this study is to evaluate the viscosity and flowability of polymer-cement composites for repairing cracks of RC structures. The viscosity and flowability of the polymer cement composites differed greatly depending on the type of polymer and the polymer cement ratio, and the polymer cement composites could be produced that could repair fine cracks in the RC structure without material separation by adjusting the proper water-cement ratio. In particular, the mixing of high viscosity EVA-modified polymer composites could be adjusted.
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설우석(Woo-Suk Sul),유현(Hyun Yoo),홍대원(Dae Won Hong),이병주(Boung Ju Lee) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
A quenching resistor is an important passive element of silicon photomultiplier has been affected by the non-uniform inflow of the hydrogen atoms during the semiconductor fabrication process. As a result, the critical problems have happened such as decrease in the resistance value and uniformity. In this paper, it was presented the method how to improve the stability and uniformity of the resistance by using the nitrogen ion implantation method to form the SixN1-x film in the surface of resistor to prevent the injection of unwanted hydrogen atoms.
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소프트볼 타격에서 의도된 타구방향에 영향을 미치는 변인들의 비교 분석
백진호 ( Jin Ho Back ),박종철 ( Jong Chul Park ),송주호 ( Joo Ho Song ),홍대원 ( Dae Won Hong ),여철훈 ( Chul Hoon Yeo ) 한국스포츠정책과학원(구 한국스포츠개발원) 2011 체육과학연구 Vol.22 No.4
이 연구는 여자 국가대표 소프트볼 선수들을 대상으로 배트 컨트롤에 의한 의도적인 타구 방향에 따라 나타나는 변인들의 차이를 비교 분석하여 세부적인 타격 기술 완성하는데 기여하고 기술 훈련을 위한 기초자료를 제공하고자 하는데 그 목적이 있었으며 이러한 연구 목적에 따라 국가대표 소프트볼 여자선수들 중 좌타자 2명의 선수를 고속 촬영을 통한 3차원 동작분석과 지면반력분석을 통해 얻은 결과는 다음과 같다. S1은 LD동작이 RD동작보다 긴 소요시간을 나타냈고 임팩트 시점과 최대 배트속도는 RD동작이 빠른 것으로 나타났다. S2는 LD동작보다 RD동작이 더 긴 소요시간은 나타냈고 배트 임팩트 시점과 최대 배트속도는 LD동작에서 빠르게 나타났다. 구간별 소요시간의 차이는 보였으나 Pre & Post 구간 비율이 약 6:4 정도로 나타났다. 신체중심의 속도변화에서 S1과 S2 모두 RD동작에서는 신체중심이 전방으로 이동하며 낮아지고 홈플레이트에서 멀어지며 임팩트 되었는데, LD동작에서는 홈플레이트 쪽으로 이동되며 임팩트하는 것으로 나타났다. 관절의 각도변화에서 양 선수 모두 RD동작에서는 TSA, TTA각 모두 감소하였고 LD동작에서는 서로 다른 변화를 보였으며, XFA각은 변화량은 RD동작 보다 LD동작이 더 큰 변화량을 보였다. 지면반력의 전·후 성분F(x)에서 RD동작에서는 양 선수 모두 좌측발의 뒤꿈치와 우측발 발끝에 체중이 실려 있었으나 LD동작에서 S1선수는 좌측발 발뒤꿈치에 있었으나 우측발은 발뒤꿈치에서 발끝으로, 임팩트 시 임팩트 후 다시 발뒤꿈치로의 이동이 나타났다. 좌·우 성분F(y)에서 준비동작에서 RD동작은 양발 안쪽에 체중이 실려 있었고, LD은 양발 바깥쪽에 체중이 실려 있었다. 수직성분F(z)에서 RD동작과 LD동작 모두 좌측발에 체중을 모은 상태로 임팩트하는 것으로 나타났고 이후 우측발로 이동하는 모습을 나타냈다. This study aimed to contribute to completing detailed hitting techniques by comparing and analyzing the kinetic differences according to intentional ball flight by bat control for Korean national female softball players and to provide with basic data for technical training, and for the research purposes, the results obtained through 3D motion analysis using the high-speed photography of two of the Korean national female left-handed softball playes and ground reaction force analysis are as follows. S1 shows the required time in which LD motion is longer than RD motion and it turned out that impact point of time and maximum bat velocity was faster in RD motion. S2 shows the required time in which RD motion is longer than LD motion and the bat impact point of time and maximum bat velocity was faster in LD motion. There was a difference in the required time in sections but the ratio of Pre & Post sections turned out to be about 6:4. In the change of the velocity of the center of mass, in S1 and S2 both, the center of mass moved forward and was lowered in RD motion and impacted going away from the home plate while in LD motion, it turned out to be impacted moving toward the home plate. In the change of the angle of the joint, both TSA and TTA decreased in RD motion of both players and changed differently in LD motion, and for XFA angle, LD motion showed a bigger change than RD motion did. For the pre- and post-component F(x) of Ground Reaction Force (GRF), weight was loaded to the heel of the left foot and the tiptoe of the right foot in both players during RD motion; however, in LD motion, the weight of Player S1 was loaded on the heel of the left foot but for the right foot, it moved from the heel to the tiptoe, and then it moved to the heel during and after the impact again. In the stand-by motion of the left/right component F(y), for RD motion, the weight was loaded on the inner side of both feet while for LD, it was loaded on the outer side of both feet. In vertical component F(z), in RD motion and LD motion both, it turned out that they impacted while putting their weight on the left foot and later it moved to the right foot.
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Ni3Al 금속간 화합물의 압연변형 및 우선방위에 관한 연구
홍대원,박영구 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.5
The Purpose of this study is to investigate the rolling deformation and preferred orientation for Ni₃Al intermetallic compounds. The chemical compositions of the alloys used in this study are 75.7Ni-24Al-0.3B(Al alloy) and 78.8Ni-21Al-0.2B(A2 alloy). The preferred orientation has been characterized by plotting inverse pole figures and pole figures. The preferred orientations of Al alloy after cold rolling, are {110} $lt;111$gt; and {110} $lt;211$gt;, whereas A2 alloy has brass type orientation of {110} $lt;211$gt;. This alloy could be cold rolled soundly to 80% reduction without intermediate annealing. The microstructure of A2 alloy consists of the ordered γ´cells surrounded by disordered γ phases. Also dislocations were concentrated in the γ phase near the of γ´/γ interface. The improved workability of this alloy may be due to the γ phase located at Ni₃Al interface, which alleviates the grain boundary embrittlement.
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