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족관절 기능과 증상을 중심으로 평가한 경골 원위부 골절에서의 금속정 치료 결과
김병민,배서영,노재영,Kim, Byoung-Min,Bae, Su-Young,Roh, Jae-Young 대한족부족관절학회 2008 대한족부족관절학회지 Vol.12 No.1
Purpose: To evaluate the safety and prognostic factors of intramedullary nailing of distal tibia fractures in terms of function and symptoms of the ankle joint. Materials and Methods: We retrospectively analyzed 22 distal tibial fractures with intramedullary nailing. The mean duration of follow-up was 43 months. We reviewed medical records to describe each case. We measured radiographic parameters such as fracture configuration, arthritic change of the ankle joint and status of reduction. We also assessed clinical results by AOFAS ankle hind foot scoring system, degree of pain by VAS and range of motion to find out prognostic factors for functional result of the ankle joint. Results: Bone healing was obtained in all cases without any wound complications. Mean AOFAS ankle score was 94. There were 4 cases with mild (VAS<3/10) ankle pain and 2 cases with mild limitation of ankle motion. The comminution of fracture had a significant relationship with delayed angular deformity of ankle joint (p=0.032). There was no other significant parameter affecting ankle joint function except the location of nail-end. Conclusion: Intramedullary nailing in distal tibia fracture is a safe and effective procedure. But further study may need to evaluate the relationship between the position of nail-end and the function of ankle joint.
졸-겔공정/광증착법을 이용한 Ag-Doped TiO<sub>2</sub> 합성 및 광촉매 특성
김병민,김정식,Kim, Byeong-Min,Kim, Jung-Sik 한국재료학회 2016 한국재료학회지 Vol.26 No.2
$TiO_2$ nanoparticles were synthesized by a sol-gel process using titanium tetra isopropoxide as a precursor at room temperature. Ag-doped $TiO_2$ nanoparticles were prepared by photoreduction of $AgNO_3$ on $TiO_2$ under UV light irradiation and calcinated at $400^{\circ}C$. Ag-doped $TiO_2$ nanoparticles were characterized for their structural and morphological properties by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The photocatalytic properties of the $TiO_2$ and Ag-doped $TiO_2$ nanoparticles were evaluated according to the degree of photocatalytic degradation of gaseous benzene under UV and visible light irradiation. To estimate the rate of photolysis under UV (${\lambda}=365nm$) and visible (${\lambda}{\geq}410nm$) light, the residual concentration of benzene was monitored by gas chromatography (GC). Both undoped/doped nanoparticles showed about 80 % of photolysis of benzene under UV light. However, under visible light irradiation Ag-doped $TiO_2$ nanoparticles exhibited a photocatalytic reaction toward the photodegradation of benzene more efficient than that of bare $TiO_2$. The enhanced photocatalytic reaction of Ag-doped $TiO_2$ nanoparticles is attributed to the decrease in the activation energy and to the existence of Ag in the $TiO_2$ host lattice, which increases the absorption capacity in the visible region by acting as an electron trapper and promotes charge separation of the photoinduced electrons ($e^-$) and holes ($h^+$). The use of Ag-doped $TiO_2$ nanoparticles preserved the option of an environmentally benign photocatalytic reaction using visible light; These particles can be applicable to environmental cleaning applications.
김병민,황윤국,이영호,강영종,지광습,Kim Byeong-Min,Hwang Yoon-Koog,Lee Young-Ho,Kang Young-Jong,Zi Goang-Seup 한국전산구조공학회 2006 한국전산구조공학회논문집 Vol.19 No.1
본 논문에서는 내구성과 수명을 획기적으로 향상시키기 위해 제3세대 건설재료인 섬유강화 플라스틱(FRP) 소재로 제작된 사각형 중공 교량 바닥판의 파괴모드를 실험과 해석을 통해 분석하였다. 재하시험 결과 바닥판의 강축방향의 거동은 파괴 직전까지도 거의 선형탄성적으로 거동한 반면, 약축방향의 거동은 재하초기부터 작은 하중하에서도 큰 비선형성을 보였다. 이 약축방향 비선형성의 원인은 웨브와 플랜지 연결부의 불완전한 일체거동으로 인한 소성거동 때문인 것으로 판단된다. 웨브와 플랜지의 연결부에 소성힌지를 도입한 간단한 구조모델을 이용하여 이를 확인하였다. 접착부의 박리 파괴 가능성도 검토하였으나 이는 대상 중공바닥판의 약축방향 파괴에 직접적으로 관여하는 것은 아닌 것으로 판단된다 약축방향의 구조거동을 개선시키기 위한 방안으로 내부를 폼으로 충전하는 방법을 제시하였으며 그 가능성을 구조해석을 통해 확인하였다. The failure mechanism of a hollow bridge deck which is made of fiber reinforced polymer (FRP) to improve its durability and life time significantly is investigated using both experiments and analyses. While the Load-displacement behavior of the deck in the longitudinal direction is almost linear just before the failure, the behavior in the transverse direction shows a strong nonlinearity even in its initial response with relatively small magnitude of loads. We found that the nonlinearity is due to the imperfection of the connection between the flange and the web; a plastic deformation can t라e place in the connection. The argument is demonstrated using a simple structural model in which a rigid plastic hinge is introduced to the connection. We also checked the contribution of the delamination mechanism to the failure. But the delamination is not the main mechanism which initiates and causes the failure of the bridge deck. In order to improved the structural behavior of the deck in the transverse direction, we suggested that the empty space of the bridge deck is filled with a foam and confirmed the improved behavior by a numerical analysis.
김병민,Kim, Byeong-Min 한국시멘트협회 2013 시멘트 Vol.199 No.-
라파즈한라시멘트는 지속적인 연구개발을 통한 양질의 시멘트 생산을 통해 그간 국가기간산업 발전에 기여해왔다. 그리고 그 중심에는 라파즈한라시멘트 콘크리트 연구소가 있다. 이는 전신인 한라시멘트 기술연구소에서부터 시작해 시멘트 및 콘크리트 기초 연구 및 신제품의 개발에 역량을 집중함으로써 라파즈한라가 지속가능한 발전을 할 수 있도록 혁신의 토대를 제공해왔기 때문이다. 앞으로도 콘크리트 연구소는 기업과 고객이 상호 윈-윈할 수 있는 전략적 사고를 바탕으로 최고의 기술지원 서비스를 제공함으로써 대 고객 서비스 수준을 제고시켜 나갈 계획이다.
김상주(Sangjoo Kim),김헌영(Heongyoung Kim),김정민(Jungmin Kim),김병민(Byungmin Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
This study present the development of an automotive steering wheel using the finite element method. That reduces the number of test repeating times and gives an information about stiffness. During frontal crash of a vehicle, a major part of the driver's kinetic energy is absorbed by the steering wheel and column system. The deformation characteristics of the steering wheel has significant effects on the injury of the driver. The steering wheel is the most common source of serious injury for drivers involved in frontal crashes. Modal analysis, strength analysis and impact analysis in steering wheel were performed to certify requirements of safety regulations. A simulation model of steering wheel and column strength simulation are established using a PAM-CRASH and ABAQUS.