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양찬수(Chan-Su Yang),공인영(In-Young Gong),이창민(Chang-Min Lee) 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.8
현재 목포 북항과 고하도를 연결하는 목포 연육교의 건설이 추진 중에 있으며, 이 교량은 2009년 말에 완공될 예정이다. 항행수역에 건설되는 교량에 대해서는 선박 운항 측면에서의 안전성 평가가 필수적이지만, 아직 이에 대한 구체적인 지침이 마련되어 있지 않은 실정이다. 본 연구에서는, 목포 연육교 평면 배치 계획에 대한 선박 운항 측면에서의 평가 절차를 소개하고, 교량의 계획 단계에서부터 고려되어야 하는 사항들에 대해 검토하였다. 교량의 주경간 등 전반적인 배치 계획에 대한 평가를 위해, 대상 해역에 교량이 건설된 상황을 설정하여 실시간 시뮬레이션(real time simulation) 및 배속 시뮬레이션(fast time simulation) 등의 운항 시뮬레이션을 실시하였다. 이로부터, 선박과 교각과의 충돌위험도를 추정하기 위해, 항로상에서의 선박의 항행 궤적 분포는 정규분포를 따른다는 가정 하에 통계적 분석을 수행하였다. A bridge which connects Mokpo North Narbor and Goha Island is going to be constructed until 2009. For the bridges being built in the navigable water area, it. is indispensible to carry out vessel traffic safety assessment from the viewpoint of shiphandlers, however, there exist no specific guidelines for the necessary conditions which the bridge designers can rely on. In this paper, traffic safety assessment procedures for the layout of the bridge are briefly introduced, and the conditions which should be taken into account at the initial design stage of the bridge are surveyed. For the safety assessment of the bridge design, ship navigation simulations, such as RTS(real time simulation) and FTS(fast time simulation), are carried out, the results of which are statistically analysed to estimate the probability of collision between the ship and the pier of the bridge.
기계적 합금화 및 in-situ와 ex-situ의 혼합공정을 통한 C 도핑된 ex-situ $MgB_2$ 선재 제조
황수민,이창민,임준형,최준혁,박진현,주진호,전병혁,김찬중,Hwang, Soo-Min,Lee, Chang-Min,Lim, Jun-Hyung,Choi, Jun-Hyuk,Park, Jin-Hyun,Joo, Jin-Ho,Jun, Byung-Hyuk,Kim, Chan-Joong 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
We successfully fabricated C-doped ex-situ $MgB_2$ wires using two different methods such as mechanical alloying(MA) and combined process(CP) of in-situ and ex-situ. In the MA, the precursor powder was prepared with a mixture of $MgB_2$ and 1 at% C powders by planetary ball milling for 0-100 h. In the CP, on the other hand, C-doped $MgB_2$ powder was prepared with Mg, B, and C powders by in-situ process via compaction, sintering, and crushing. The powders prepared by two methods were loaded into Fe tube and then the assemblages were drawn by a conventional powder-in-tube technique. The MA treatment of C-added $MgB_2$ decreased the particles/grains size and resulted in C-doping into $MgB_2$ after sintering, improving the critical current density($J_c$) in high external magnetic field. For the C-doped $MgB_2$ wire by MA for 25 h, the $J_c$ was $4.1{\times}10^3A/cm^2$ at 5 K and 6.4 T, which was 5.9 times higher than that of pure and untreated $MgB_2$ wire. The CP also provided C-doping into $MgB_2$ and improved the $J_c$ in high magnetic field; the C-doped $MgB_2$ wire fabricated by CP exhibited a $J_c$ being 2.3 times higher than that of the ex-situ wire used commercial $MgB_2$ powder at 5 K and 6.0 T($2.7{\times}10^3A/cm^2\;vs.\;1.2{\times}10^3A/cm^2$).
TFA-MOD법으로 제조된 다층 YBCO 박막의 미세구조 관찰
장석헌,임준형,이창민,황수민,최준혁,심종현,주진호,김찬중,Jang, Seok-Hern,Lim, Jun-Hyung,Lee, Chang-Min,Hwang, Soo-Min,Choi, Jun-Hyuk,Shim, Jong-Hyun,Joo, Jin-Ho,Kim, Chan-Joong 한국초전도학회 2008 Progress in superconductivity Vol.9 No.2
We fabricated $YBa_2Cu_3O_{7-x}$(YBCO) films on (00l) $LaAlO_3$ substrates prepared by metal organic deposition(MOD) method using trifluoroacetate(TFA) solution. The films with various thicknesses were prepared by repeating the dip-coating and calcining processes. The effects of film thickness on phase formation, microstructures, and critical properties were evaluated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The microstructure and resultant critical current($I_C$) and critical current density($J_C$) varied remarkably with film thickness: The ($I_C$) value increased from 39 to 160 A/cm-width as the number of coatings increased from one to four, while the corresponding $J_C$ was measured to be in the range of $0.84-1.21\;MA/cm^2$. Both the $I_C$ and $J_C$ decreased when an additional coating was applied due to microstructural degradation, indicating that the optimum thickness is in the range of $1.1-1.8\;{\mu}m$. The possible cause for the decrease in the $I_C$ and $J_C$ value for film thicker than $1.8\;{\mu}m$ include non-uniform thickness, increased surface roughness, and the poor formability of the YBCO phase and texture arising from the insufficient heat treatment time with respect to the increased thickness.
초장립종 벼를 이용한 입형 관련 QTL 분석 및 국내 벼 품종 입형 개선 연구
김석만,박현수,이창민,백만기,조영찬,서정필,정오영,Kim, Suk-Man,Park, Hyun-Su,Lee, Chang-Min,Baek, Man-Kee,Cho, Young-Chan,Suh, Jung-Pil,Jeong, Oh-Young 한국작물학회 2020 한국작물학회지 Vol.65 No.4
Rice grain shape is one of the key components of grain yield and market value. An understanding of the genetic basis of the variation in grain shape could be used to improve grain shape. In this study, we developed a total of 265 F<sub>2</sub> individuals derived from a cross between japonica cultivars (Josaeng-jado and Langi) and used this population for quantitative trait locus (QLT) analysis. Correlation analysis was performed to identify relationships between grain traits (GL: grain length, GW: grain width, L/W: ratio of length to width, TGW: 1,000 grain weight). The grain shape was positively correlated with GL and TGW, and negatively correlated with GW. In QTL analysis associated with grain shape, one QTL for GL, qGL5, detected on chromosome 5, explained 20.3% of the phenotypic variation (PV), while two QTLs, qGW5 (PV=36.1) and qGW7 (PV=26.1), for GW were identified on chromosomes 5 and 7, respectively. Evaluation of the effects of each of the QTLs on the grain shape in the population showed a significant difference in the grain size in positive lines compared with the lines without the QTLs. According to the QTL combination of the allelic-types, the grain shape of the tested lines varied from semi-round type to long spindle-shaped type. The results of this study extend our knowledge about the genetic pool governing the diversity of grain shape in japonica cultivars and could be used to improve the grain shape of this species through marker-assisted selective breeding in Korea.
민석기(Seokki Min),이창민(Changmin Lee),채찬병(Chan-Byoung Chae) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 혈관에 이물질이 쌓여 수축된 분자 통신 채널을 분석하였다. 장애물이 내부에 놓인 원통형의 채널환경을 가정하여 시뮬레이션을 진행했다. 분자의 전파는 중앙지점의 반지름, 장애물의 시작위치 등에 영향 받는 것을 확인할 수 있었으며, 이 결과를 통해 추후 연구에 대한 방향성을 제시하였다.