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Molecular cytogenetic analysis of the Vigna species distributed in Korea
최해운,김민영,이상훈,Sayeda Sultana,방재욱 한국유전학회 2013 Genes & Genomics Vol.35 No.2
Vigna plants distributed in Korea were analyzed by molecular cytogenetic fluorescence in situ hybridization (FISH), genomic in situ hybridization (GISH) and rDNA ITS/NTS sequences. FISH revealed that variable 45S rRNA gene loci (one to four) were localized on the terminal regions of chromosomes, while two conserved 5S rRNA gene loci from all species examined, except for rice bean (single locus), were detected. FISH and GISH showed the characteristic organization of rRNA gene loci and genomic homology on the chromosomes, indicating their cytogenetic relatationships. ITS sequence revealed that there was considerable variation in length (190–207 bp in ITS1,205–221 bp in ITS2) and nucleotide composition (7–67 bp). The 5S rRNA gene unit comprised coding region (118 bp)and extensive sequence heterogeneity (97–221 bp). Phylogenetic analysis of the ITS and NTS sequences demonstrated that the Vigna species are divided into two groups: angularis (V. angularis, V. umbellata, V. nakashimae and V. nipponensis)and unguiculata (V. unguiculata, V. sesquipedalis and V. vexillata). Sequence data also showed that mung bean was closer to the angularis group.
최해운 한국정신과학학회 2002 한국정신과학회 학술대회 논문집 Vol.17 No.-
초상현상과 정신과학연구는 인간 능력의 개화, 자연치유력의 증진, 예방의학 통합의료의 추진, 과학기술의 혁신, 풍요로운 마음으로 평화스런 사회를 실현하는데 중요하다. 국제 생명정보과학 학회에서 발표한 논문을 검토하여 최근의 연구 분야 및 동향에 대해 알아본다. 일본에서 이러한 연구가 과학적으로 어떻게 이루어지고 있는가는 앞으로 우리나라가 연구해야할 방향성을 제시해줄 것이다. 연구자들의 구성과 주제별로 연구 분야를 분류하고, 주요 실험 및 측정 방법과 결과에 대하여 살펴보았다.
펨토초레이저의 나노섬유 가공시 발생하는 산란에 대한 연구
최해운,신현명 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
In this article, the analysis of laser beam multiple scattering in electrospun(ES) poly-caprolactone(PCL) nano-fiber is presented. Analytical solutions of single scattering and approximation of multiple scattering are studied. A computer simulation model was introduced to explain the scattering effect of 250nm nanofibers. Indeed, it is believed that the multiscattering and backscattering of light contributes to lowering absorption and widening ablation width.
Ultrashort Pulsed Laser Machining for Biomolecule Trapping
최해운,Dave F. Farson,L. James Lee,이호 한국광학회 2009 Current Optics and Photonics Vol.13 No.3
Ultrashort pulse laser drilling of polycarbonate track-etched membrane (pTEM) material was used to fabricate a mouse embryo cell trapping device. Holes with a diameter of 2 μm to 5 μm were fabricated on a 10 μm thick membrane using a femtosecond laser with a 150 fs pulse width and 775 nm wavelength and multiple-pulse irradiation. In cell trapping tests, the overall cell occupancy of the machined holes in the fabricated pTEM was found to be more than 80%. The results of a single pulse and multiple pulse irradiation were compared in terms of the surface quality. It was generally found that a single pulse with high energy was less desirable than irradiation with multiple pulses of lower energy.
최해운,신현명 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
Interface friction in blanking dies, cold forging and extrusion of aluminum alloys is a major cause of inefficient process. This paper describes an investigation of femtosecond laser texturing for reduction of interface friction on sliding surfaces in forming process. Femtosecond direct writing technology was used to fabricate a laser micromachined die and to create microgroove patterns with varying size and density on metal forming dies. A systematic approach to find the optimum parameters and computer simulation comparison of friction coefficients are provided to study the relation of friction coefficients and die profiles. In metal forming tests, the effectiveness of various laser - machined patterns for enhancing interface lubrication is determined.
최해운 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.6
In this study, we summarize the state-of-the-art laser welding used for welding copper and aluminum alloys, which are key materials for electrified powertrain components. Extensive research on laser beam modulation, power control, beam control, and process monitoring to improve welding reliability and to solve the challenges of dissimilar welds are reviewed and summarized. Furthermore, various techniques for real-time behavior of the weld pool and weld quality monitoring are presented. Along with various techniques to improve spatter and weld pool instability during welding, we have also included research results on process monitoring using artificial intelligence and deep learning techniques. Moreover, computer simulation helps understand various welding phenomena. The research results on improving the quality of welded products through laser beam dynamic control are also included.