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Narae Han,Jiwoong Wi,Sungoh Im,Ka-Min Lim,Hun-Dong Lee,Won-Joong Jeong,Geun-Joong Kim,Chan Song Kim,Eun-Jeong Park,Mi Sook Hwang,최동욱 한국조류학회I 2021 ALGAE Vol.36 No.3
An increase in seawater temperature owing to global warming is expected to substantially limit the growth of marine algae, including Pyropia yezoensis, a commercially valuable red alga. To improve our knowledge of the genes involved in the acquisition of heat tolerance in P. yezoensis, transcriptomes sequences were obtained from both the wild-type SG104 P. yezoensis and heat-tolerant mutant Gy500. We selected 1,251 differentially expressed genes that were up- or downregulated in response to the heat stress condition and in the heat-tolerant mutant Gy500, based on fragment per million reads expression values. Among them, PyHRG1 was downregulated under heat stress in SG104 and expressed at a low level in Gy500. PyHRG1 encodes a secretory protein of 26.5 kDa. PyHRG1 shows no significant sequence homology with any known genes deposited in public databases to date. However, PyHRG1 homologs were found in other red algae, including other Pyropia species. When PyHRG1 was introduced into the single-cell green alga Chlamydomonas reinhardtii, transformed cells overexpressing PyHRG1 showed severely retarded growth. These results demonstrate that PyHRG1 encodes a novel red algae-specific protein and plays a role in heat tolerance in algae. The transcriptome sequences obtained in this study, which include PyHRG1, will facilitate future studies to understand the molecular mechanisms involved in heat tolerance in red algae.
Narae Kang,Yonsoo Kim,Hui Seung Noh,Hung Soo Kim 한국방재학회 2016 Journal of Disaster Management Vol.1 No.4
Rainfall has recently begun to show different properties in space and time. In particular, although localized heavy rainfall is frequent, rain gauges on the ground can only observe rainfall at one point. In other words, ground-based rain gauges have limitations in spatial and temporal resolution for measuring rainfall. As a result, there is a need to utilize radar rainfall measurements that can consider the spatial distribution of the change in rainfall based on the direction of the storm. In this study, we tried to apply radar rainfall for a runoff simulation of an urban drainage system. The study area was Guro-gu, Seoul City, Korea, and we divided the study area into sub-basins based on the rain gauge network of the AWS (Automatic Weather Station). Then, the radar rainfall data were adjusted using the rainfall data of the rain gauge stations, and the areal rainfall amounts were obtained. The runoffs were simulated using the XP-SWMM model in the sub-basins of an urban drainage system. As a result, the adjusted radar rainfalls underestimated the ground-based measurement data by 60 to 95%. Therefore, differences in runoffs simulated by the adjusted radar and the gauge rainfall amounts are found. The peak runoff time from the radar rainfall occurred earlier than that from the gauge rainfall. This result is due to the fact that the radar rainfall can reflect the spatial variability of the rainfall in time by taking into consideration the movement of a storm.
Alterations in Social Brain Network Topology at Rest in Children With Autism Spectrum Disorder
Narae Yoon,Youngmin Huh,Hyekyoung Lee,Johanna Inhyang Kim,Jung Lee,Chan-Mo Yang,Soomin Jang,Yebin D. Ahn,Mee Rim Oh,Dong Soo Lee,Hyejin Kang,Bung-Nyun Kim 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.12
Objective Underconnectivity in the resting brain is not consistent in autism spectrum disorder (ASD). However, it is known that the functional connectivity of the default mode network is mainly decreased in childhood ASD. This study investigated the brain network topology as the changes in the connection strength and network efficiency in childhood ASD, including the early developmental stages. Methods In this study, 31 ASD children aged 2–11 years were compared with 31 age and sex-matched children showing typical development. We explored the functional connectivity based on graph filtration by assessing the single linkage distance and global and nodal efficiencies using resting-state functional magnetic resonance imaging. The relationship between functional connectivity and clinical scores was also analyzed. Results Underconnectivities within the posterior default mode network subregions and between the inferior parietal lobule and inferior frontal/superior temporal regions were observed in the ASD group. These areas significantly correlated with the clinical phenotypes. The global, local, and nodal network efficiencies were lower in children with ASD than in those with typical development. In the preschool-age children (2–6 years) with ASD, the anterior-posterior connectivity of the default mode network and cerebellar connectivity were reduced. Conclusion The observed topological reorganization, underconnectivity, and disrupted efficiency in the default mode network subregions and social function-related regions could be significant biomarkers of childhood ASD.
Structural Analysis of Rear Support and Connection Part of 3-Wheel Riding Type Cultivating Vehicle
( Narae Kang ),( Ilsu Choi ),( Youngkeun Kim ),( Youngtae Yun ),( Yong Choi ),( Soonam Yoo ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Four-wheel riding-type cultivator is mainly used for pesticide applicator, fertilizer spreader and vinyl mulching in Korea. Adjustment of the vehicle width depends on the farming modes and to whom it is attached. It is difficult to check the work status. So a three-wheel riding-type cultivator is being developed for the field of crops to improve performance such as ground clearance, width control, steering system and work convenience. In order to optimally design, structural analysis of the connection part and rear support was carried out. In this study, 3D modeling of the rear support and connection part was followed by analysis of the strain, stress and safety factor of the three-wheel riding-type cultivator using CAE. First, drawings of the three-wheel riding-type cultivator were prepared in 3D using Solid Works and then linear static analysis was conducted with the ANSYS Ver.13.0 structural analysis program. Structural Steel was selected as the material of the three-wheel riding-type cultivator and the automatic mesh generator of ANSYS was used. The mesh consists of 52,018 nodes and 24,713 elements. And contact and constraint conditions were set. The 5,439 N load was applied to the two connection parts in consideration of the weight of the three-wheel drive type control unit. A linear static analysis was carried out for checking static state operation. Finally, strain and stress, safety factor were analyzed. As a result of the stress analysis, the deformation amount was 8.4 mm at the connection part of the upper support frame. The bottom support part was most vulnerable to safety factor 0.3. Therefore, the materials of this site would be reinforced and supplemented.