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43 results on '"Kim, Jinseung"'

23. Alterations of Limbic Structure Volumes in Patients with Obstructive Sleep Apnea

Author

Park, Kang Min and Kim, Jinseung

Abstract

ABSTRACT:Objectives:We investigated the change in limbic structure volumes and intrinsic limbic network in patients with obstructive sleep apnea (OSA) compared to healthy controls.Methods:We enrolled 26 patients with OSA and 30 healthy controls. They underwent three-dimensional T1-weighted magnetic resonance imaging (MRI) on a 3 T MRI scanner. The limbic structures were analyzed volumetrically using the FreeSurfer program. We examined the intrinsic limbic network using the Brain Analysis with Graph Theory program and compared the groups' limbic structure volumes and intrinsic limbic network.Results:There were significant differences in specific limbic structure volumes between the groups. The volumes in the right amygdala, right hippocampus, right hypothalamus, right nucleus accumbens, left amygdala, left basal forebrain, left hippocampus, left hypothalamus, and left nucleus accumbens in patients with OSA were lower than those in healthy controls (right amygdala, 0.102 vs. 0.113%, p= 0.004; right hippocampus, 0.253 vs. 0.281%, p= 0.002; right hypothalamus, 0.028 vs. 0.032%, p= 0.002; right nucleus accumbens, 0.021 vs. 0.024%, p= 0.019; left amygdala, 0.089 vs. 0.098%, p= 0.007; left basal forebrain, 0.020 vs. 0.022%, p= 0.027; left hippocampus, 0.245 vs. 0.265%, p= 0.021; left hypothalamus, 0.028 vs. 0.031%, p= 0.016; left nucleus accumbens, 0.023 vs. 0.027%, p= 0.002). However, there were no significant differences in network measures between the groups.Conclusion:We demonstrate that the volumes of several limbic structures in patients with OSA are significantly lower than those in healthy controls. However, there are no alterations to the intrinsic limbic network. These findings suggest that OSA is one of the risk factors for cognitive impairments.

Published
2023
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29. Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures

Author

Kim Hyeong-Seok, Cho Joong-Yeon, Byeon Kyeong-Jae, Park Hyoungwon, Kim Jinseung, and Lee Heon

Subjects
Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract A micro- and nanoscale complex structure made of a high refractive index polymer (n = 2.08) was formed on the ITO electrode layer of an edge-emitting type GaN blue light-emitting diode (LED), in order to improve the photon extraction efficiency by suppressing total internal reflection of photons. The nanoimprint lithography process was used to form the micro- and nanoscale complex structures, using a polymer resin with dispersed TiO2 nano-particles as an imprint resin. Plasma processing, such as reactive ion etching, was used to form the micro- and nano-scale complex structure; thus, plasma-induced damage to the LED device can be avoided. Due to the high refractive index polymeric micro- and nanostructure on the ITO layer, the electroluminescence emission was increased up to 20%, compared to an identical LED that was grown on a patterned sapphire substrate to improve photon extraction efficiency.

Published
2011

43. Association between patients with migraine and sarcopenia: A retrospective study.

Author

Lee DA, Lee HJ, Kim J, and Park KM

Subjects
Humans, Retrospective Studies, Male, Female, Adult, Middle Aged, Temporal Muscle diagnostic imaging, Case-Control Studies, Migraine with Aura, Sarcopenia epidemiology, Sarcopenia diagnostic imaging, Sarcopenia etiology, Migraine Disorders diagnostic imaging, Magnetic Resonance Imaging
Abstract

Recently, interest in sarcopenia has been increasing in patients with various neurological diseases. Thus, we investigated the presence of sarcopenia in patients with episodic migraine (EM) based on temporal muscle thickness (TMT). This was a retrospectively observational study following STROBE guidelines. We enrolled patients with EM and healthy controls. Both groups underwent brain magnetic resonance imaging, including three-dimensional T1-weighted imaging. We calculated the TMT using T1-weighted imaging, which is a marker for sarcopenia. We compared TMT between patients with EM and healthy controls, and analyzed it according to presence of migraine aura. We retrospectively enrolled 82 patients with EM and 53 healthy controls. TMT was not different between patients with EM and healthy controls (10.804 ± 2.045 mm in patients with EM vs 10.721 ± 1.547 mm in healthy controls, P = .801). Furthermore, TMT was not different according to presence of migraine aura in patients with EM (10.994 ± 2.016 mm in patients with migraine aura vs 10.716 ± 2.071 mm in those without, P = .569). There were no correlations between TMT and clinical characteristics in patients with EM, including age, age of onset, duration of migraine, headache intensity, and headache frequency. This study found no statistical difference in TMT between patients with EM and healthy controls or between patients with EM with and without aura. These findings suggest that there is no evidence of sarcopenia in patients with EM., Competing Interests: The authors have no conflicts of interest to disclose., (Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.)

Published
2024
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