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Effect of surface conditions on blast wave propagation
Seungho Song,Yibao Li,이창훈,최정일 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
We performed numerical simulations of blast wave propagations on surfaces by solving axisymmetric two-dimensional Euler equations. Assuming the initial stage of fireball at the breakaway point after an explosion, we investigated the effect of surface conditions considering surface convex or concave elements and thermal conditions on blast wave propagations near the ground surface. Parametric studies were performed by varying the geometrical factors of the surface element as well as thermal layer characteristics. We found that the peak overpressure near the ground zero was increased due to the surface elements, while modulations of the blast wave propagations were limited within a region for the surface elements. Because of the thermal layer, the precursor was formed in the propagations, which led to the attenuation of the peak overpressure on the ground surface.
송승호(Seungho Song),이창훈(Changhoon Lee),최정일(Jung-Il Choi) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.4
We develop a numerical method for solving the radiation hydrodynamic equations in one-dimensional spherical coordinates. The present method is validated through simulations of shock tube, thermal radiative diffusion and point explosion problems. The transient growth of the fireball is investigated by varying explosion yields. The present study clearly captures well-known breakaway phenomena related to the shock separation between pressure waves and thermal shock front. The fireball radius at the breakaway point is roughly increased by the yield to power of 0.4.
Meta-analysis of QTL involved in drought tolerance and grain yield of maize
Kitae Song,Hyochul Kim,Seungho Shin,Kyung-Hee Kim,Jun-Cheol Moon,Jae Yoon Kim,Byung-Moo Lee 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
The maize genome is complex with exceeding the levels of intra-specific variation, repetitive DNA content, and allelic content observed between many species. Because of tremendous diversity and variants, maize is considered as a forefront crop development and estimation of molecular markers for agricultural trait in genetics and breeding. Using quantitative trait loci (QTL) and marker assisted breeding (MAS), molecular breeders are able to development of drought tolerance and grain yield in maize genotype. To study QTL congruency, a meta QTL analysis including results from eight-teen QTL publications for grain yield and drought tolerance were considered. Among them, we assembled 420 QTLs for abscisic acid (ABA) concentration, anthesis silking interval (ASI), days to flower, days to silk, ear number, kernel number, grain number and grain yields, involved in drought tolerance and grain yield. The meta QTL analysis revealed significant evidence for linkage of these traits to 39 different segments as candidates regions on maize genome. A total of 571 marker was selected as QTL or integrated QTL markers for narrowing down the QTL region into specific functionally relevant candidates. The results of meta QTL analysis helped to refine the genomic regions of agricultural traits, interest described and provided the closest flanking markers.
송승호 ( Seungho Song ),김지훈 ( Jeehoon Kim ),김영훈 ( Yong-hoon Kim ) 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.3
Artificial neuromorphic devices are considered the key component in realizing energy-efficient and brain-inspired computing systems. For the artificial neuromorphic devices, various material candidates and device architectures have been reported, including two-dimensional materials, metal-oxide semiconductors, organic semiconductors, and halide perovskite materials. In addition to conventional electrical neuromorphic devices, optoelectronic neuromorphic devices, which operate under a light stimulus, have received significant interest due to their potential advantages such as low power consumption, parallel processing, and high bandwidth. This article reviews the recent progress in optoelectronic neuromorphic devices using various active materials such as two-dimensional materials, metal-oxide semiconductors, organic semiconductors, and halide perovskites
A novel autophagy inducer, AS777, ameliorates liver fibrosis via suppressing liver inflammation
Seungho Choi,Min Woo Kim,Pasupathi Sundaramoorthy,Hyun-jin Jung,Ju-Hee Kang,Kwang Won Jeong,Hwan Mook Kim,Gyoonhee Han,Jung Ju Kim,Seong Won Song,Hye Jeong Shin,Seung Hyun Oh 한국실험동물학회 2019 한국실험동물학회 학술발표대회 논문집 Vol.2019 No.1