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750 results on '"Lee, Sungmin"'

152. Abdominal Aortic Thrombus Segmentation in Postoperative Computed Tomography Angiography Images Using Bi-Directional Convolutional Long Short-Term Memory Architecture.

Author

Jung, Younhyun, Kim, Suhyeon, Kim, Jihu, Hwang, Byunghoon, Lee, Sungmin, Kim, Eun Young, Kim, Jeong Ho, and Hwang, Hyoseok

Subjects
COMPUTED tomography, THROMBOSIS, ABDOMINAL aortic aneurysms, CONVOLUTIONAL neural networks, ANGIOGRAPHY, RECURRENT neural networks, IMAGE segmentation
Abstract

Abdominal aortic aneurysm (AAA) is a fatal clinical condition with high mortality. Computed tomography angiography (CTA) imaging is the preferred minimally invasive modality for the long-term postoperative observation of AAA. Accurate segmentation of the thrombus region of interest (ROI) in a postoperative CTA image volume is essential for quantitative assessment and rapid clinical decision making by clinicians. Few investigators have proposed the adoption of convolutional neural networks (CNN). Although these methods demonstrated the potential of CNN architectures by automating the thrombus ROI segmentation, the segmentation performance can be further improved. The existing methods performed the segmentation process independently per 2D image and were incapable of using adjacent images, which could be useful for the robust segmentation of thrombus ROIs. In this work, we propose a thrombus ROI segmentation method to utilize not only the spatial features of a target image, but also the volumetric coherence available from adjacent images. We newly adopted a recurrent neural network, bi-directional convolutional long short-term memory (Bi-CLSTM) architecture, which can learn coherence between a sequence of data. This coherence learning capability can be useful for challenging situations, for example, when the target image exhibits inherent postoperative artifacts and noises, the inclusion of adjacent images would facilitate learning more robust features for thrombus ROI segmentation. We demonstrate the segmentation capability of our Bi-CLSTM-based method with a comparison of the existing 2D-based thrombus ROI segmentation counterpart as well as other established 2D- and 3D-based alternatives. Our comparison is based on a large-scale clinical dataset of 60 patient studies (i.e., 60 CTA image volumes). The results suggest the superior segmentation performance of our Bi–CLSTM-based method by achieving the highest scores of the evaluation metrics, e.g., our Bi-CLSTM results were 0.0331 higher on total overlap and 0.0331 lower on false negative when compared to 2D U-net++ as the second-best. [ABSTRACT FROM AUTHOR]

Published
2023
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160. Additional file 9 of Downregulated CLIP3 induces radioresistance by enhancing stemness and glycolytic flux in glioblastoma

Author

Kang, Hyunkoo, Lee, Sungmin, Kim, Kyeongmin, Jeon, Jaewan, Kang, Seok-Gu, Youn, HyeSook, Kim, Hae Yu, and Youn, BuHyun

Abstract

Additional file 9: Figure S1. Spy1 and CLIP3 expression in gliomas correlates with poor survival. Figure S2. GSCs are enriched by IR-induced CLIP3 downregulation in GBM cells. Figure S3. Spy1-CLIP3 axis contributes to metabolic shift toward glycolysis in patient-derived GSCs. Figure S4. Spy1-CLIP3 Axis Contributes to Metabolic Shift toward Glycolysis in GBM Cells. Figure S5. Glimepiride Disrupts GSC Maintenance by CLIP3 Activation. Figure S6. Glimepiride inhibits glucose uptake and lactate production. Figure S7. Glimepiride hardly changes the body weight of GBM-bearing mice.

Published
2021
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170. Emergent Magnetic Phases in Pressure-Tuned van der Waals Antiferromagnet FePS3

Author

Coak, Matthew J., primary, Jarvis, David M., additional, Hamidov, Hayrullo, additional, Wildes, Andrew R., additional, Paddison, Joseph A. M., additional, Liu, Cheng, additional, Haines, Charles R. S., additional, Dang, Ngoc T., additional, Kichanov, Sergey E., additional, Savenko, Boris N., additional, Lee, Sungmin, additional, Kratochvílová, Marie, additional, Klotz, Stefan, additional, Hansen, Thomas C., additional, Kozlenko, Denis P., additional, Park, Je-Geun, additional, and Saxena, Siddharth S., additional

Published
2021
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175. Preparation and characterization of multifunctional nanofibers containing metal–organic frameworks and Cu2O nanoparticles: particulate matter capture and antibacterial activity

Author

Jang, Sanha, primary, Jung, Sungwoo, additional, Song, Sehwan, additional, Lee, Sungmin, additional, Lee, Haksoo, additional, Cho, Eunyeong, additional, Lee, Hee Jung, additional, Park, Sungkyun, additional, Youn, Buhyun, additional, and Park, Kang Hyun, additional

Published
2021
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181. Strongly adhesive dry transfer technique for van der Waals heterostructure

Author

Son, Suhan, primary, Shin, Young Jae, additional, Zhang, Kaixuan, additional, Shin, Jeacheol, additional, Lee, Sungmin, additional, Idzuchi, Hiroshi, additional, Coak, Matthew J, additional, Kim, Hwangsun, additional, Kim, Jangwon, additional, Kim, Jae Hoon, additional, Kim, Miyoung, additional, Kim, Dohun, additional, Kim, Philip, additional, and Park, Je-Geun, additional

Published
2020
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183. Coherent many-body exciton in van der Waals antiferromagnet NiPS3

Author

Kang, Soonmin, primary, Kim, Kangwon, additional, Kim, Beom Hyun, additional, Kim, Jonghyeon, additional, Sim, Kyung Ik, additional, Lee, Jae-Ung, additional, Lee, Sungmin, additional, Park, Kisoo, additional, Yun, Seokhwan, additional, Kim, Taehun, additional, Nag, Abhishek, additional, Walters, Andrew, additional, Garcia-Fernandez, Mirian, additional, Li, Jiemin, additional, Chapon, Laurent, additional, Zhou, Ke-Jin, additional, Son, Young-Woo, additional, Kim, Jae Hoon, additional, Cheong, Hyeonsik, additional, and Park, Je-Geun, additional

Published
2020
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192. Linear Magnetoelectric Phase in Ultrathin MnPS₃ Probed by Optical Second Harmonic Generation

Author

Chu, Hao, Roh, Chang Jae, Island, Joshua O., Li, Chen, Lee, Sungmin, Chen, Jingjing, Park, Je-Geun, Young, Andrea F., Lee, Jong Seok, and Hsieh, David

Abstract

The transition metal thiophosphates MPS₃ (M=Mn, Fe, Ni) are a class of van der Waals stacked insulating antiferromagnets that can be exfoliated down to the ultrathin limit. MnPS₃ is particularly interesting because its Néel ordered state breaks both spatial-inversion and time-reversal symmetries, allowing for a linear magnetoelectric phase that is rare among van der Waals materials. However, it is unknown whether this unique magnetic structure of bulk MnPS₃ remains stable in the ultrathin limit. Using optical second harmonic generation rotational anisotropy, we show that long-range linear magnetoelectric type Néel order in MnPS₃ persists down to at least 5.3 nm thickness. However an unusual mirror symmetry breaking develops in ultrathin samples on SiO₂ substrates that is absent in bulk materials, which is likely related to substrate induced strain.

Published
2020

193. Empty Parks: An Observational and Correlational Study Using Unmanned Aerial Vehicles (UAVs)

Author

Park, Keunhyun, Lee, Sungmin, Choi, Dong-ah, and Wichmann Verlag im VDE Verlag GmbH

Subjects
direct observation, drones, Neighbourhood parks, underutilisation, UAV, unmanned aircraft systems, human activities, Landscape Architecture
Abstract

If a neighbourhood park fails to meet the needs of its residents usage may decrease, which potentially makes the park vulnerable to crime and social disorder. Despite the popularity of studying park visitation or park-based physical activity, there is a lack of studies on factors associated with empty parks. This study explores factors related to the underutilisation of neighbourhood parks in Salt Lake County, Utah, USA, using a novel data collection approach – unmanned aerial vehicles (UAVs). The findings from exploratory video analysis and inferential statistical modelling show that park programs and neighbourhood environments, as well as temporal aspects, are associated with the likelihood of empty parks. Additional analyses of no-child, no-senior, and no-female parks, respectively, support these findings. An understanding of park-use dynamics could promote effective plans, policies, and programs that promote park utilisation and park-based physical activity.

Published
2020

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