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Ji Hong Kim,Yun Jeong Choi,Ji Sun Im,Ayoung Jo,Ki-BongLee,Byong Chol Bai 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
In this study, petroleum pitch-based activated carbon was prepared, and the correlation between themolecular weight of the pitch and the specific surface area of the prepared activated carbon wasconsidered. The petroleum pitch was prepared by thermal synthesis of PFO (pyrolysis fuel oil) at380 430 C to control the molecular weight of the pitch, and the product was analyzed by MALDI-TOF(matrix-assisted laser desorption/ionization-time offlight). The activation proceeded by using KOH at850 C for 1 hour, and the pore structure of the prepared activated carbon was characterized by theBrunauer–Emmett–Teller (BET) method. The pitch synthesized at low temperature had a high specificsurface area to 1855 m2/g due to the presence of volatile compounds with values of 128 256 m/z, whichformed cavities upon volatilization.
Ahn, Ji Hyeon,Chen, Bai Hui,Yan, Bing Chun,Park, Joon Ha,Kang, Il Jun,Lee, Tae-Kyeong,Cho, Jeong Hwi,Shin, Bich-Na,Lee, Jae-Chul,Jeon, Yong Hwan,Hong, Seongkweon,Lee, Young Joo,Choi, Soo Young,Won, Mo SPANDIDOS PUBLICATIONS 2018 MOLECULAR MEDICINE REPORTS Vol.17 No.1
<P>GABAergic projections terminate on numerous hippocampal interneurons containing calcium binding proteins (CBPs), including calbindin D-28k (CB), calretinin (CR) and parvalbumin (PV). Memory deficits and expression levels of CB, CR, and PV were examined in the hippocampal subregions following systemic scopolamine (Scop; 1 mg/kg) treatment for 4 weeks in mice. Scop treatment induced significant memory deficits from 1 week after Scop treatment. CB, CR and PV immunoreactivities distributions were in hippocampal subregions [CA1 and CA3 regions, and the dentate gyrus (DG)]. CB immunoreactivity (CB<SUP>+</SUP>) was gradually decreased in all subregions until 2 weeks after Scop treatment, and CB<SUP>+</SUP> was decreased to the lowest level in all subregions at 3 and 4 weeks. CR<SUP>+</SUP> in the CA1 region was gradually decreased until 2 weeks and hardly observed at 3 and 4 weeks; in the CA3 region, CR<SUP>+</SUP> was not altered in all subregions at any time. In the DG, CR+ was gradually decreased until 2 weeks and lowest at 3 and 4 weeks. PV<SUP>+</SUP> in the CA1 region was not altered at 1 week, and gradually decreased from 2 weeks. In the CA3 region, PV<SUP>+</SUP> did not change in any subregions at any time. In the DG, PV<SUP>+</SUP> was not altered at 1 week, decreased at 2 weeks, and lowest at 3 and 4 weeks. In brief, Scop significantly decreased CBPs expressions in the hippocampus ≥3 weeks after the treatment although memory deficits had developed at 1 week. Therefore, it is suggested that Scop (1 mg/kg) must be systemically treated for ≥3 weeks to investigate changes in expression levels of CBPs in the hippocampus.</P>
Total ionizing dose effect on graphene field effect transistors
Li Ji-fang,Guo Hong-Xia,Ma Wu-ying,Song Hong-jia,Zhong Xiang-li,Zhang Feng-qi,Li Yangfan,Bai Ruxue,Lu Xiaojie 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.12
In this work, the total-ionizing-dose (TID) efects on graphene feld efect transistors (GFETs) were investigated using 10 keV X-ray irradiation under various gate biases in irradiation environment. For reliability applications, the Dirac voltage (VDirac) shifted negatively during irradiation as the hole mobility (μh) and electron mobility (μe) declined under the positive gate and zero bias. Under negative gate bias, the Dirac voltage (VDirac) moved in a positive direction, reducing hole mobility (μh) and electron mobility (μe). Thus, we can conclude that the positive gate bias is the worst bias of GFETs by contrasting the experimental outcomes under various biases. During the recovery time of 9 h and 24 h after irradiation, and it became clear that the Dirac voltage (VDirac) shifted in a positive direction. Notably, the emergence of trap charges caused by irradiation, and the accumulation of trap charges can be used to explain these phenomena. The recovery time outcome data indicate that radiation damage was caused by the trap charge created during irradiation. Therefore, this work assists in the implementation of GFETs in challenging environments.
YOLO 및 DeepSORT를 활용한 학교안전보행 모니터링 시스템 개발
송지현(Ji-Hyun SONG),배진호(Jin-Ho BAI),박수홍(Su-Hong PARK) 한국수산해양교육학회 2023 水産海洋敎育硏究 Vol.35 No.2
In order to prevent safety accidents while walking in schools, a monitoring system using object recognition technology was developed for corridors and stairs. Using a fixed webcam and computer, the function of detecting and tracking the human body in real time and calculating the movement speed of the student was implemented. The object detection model was trained using COCO dataset and YOLOv7 network training architecture. Using the object tracking model and Python, it created an object speed estimation system through real-time video analysis. A custom model for human body detection was developed, and the accuracy of the model was mAP_0.5: 0.7387, mAP_0.5_0.95: 0.4314.
AHN, JI HYEON,CHEN, BAI HUI,SHIN, BICH-NA,LEE, TAE-KYEONG,CHO, JEONG HWI,KIM, IN HYE,PARK, JOON HA,LEE, JAE-CHUL,TAE, HYUN-JIN,LEE, CHOONG-HYUN,WON, MOO-HO,LEE, YUN LYUL,CHOI, SOO YOUNG,HONG, SEONGKWE D.A. Spandidos 2016 MOLECULAR MEDICINE REPORTS Vol. No.
<P>Catalase (CAT) is an important antioxidant enzyme and is crucial in modulating synaptic plasticity in the brain. In this study, CAT expression as well as neuronal distribution was compared in the hippocampus among young, adult and aged mice and rats. Male ICR mice and Sprague Dawley rats were used at postnatal month (PM) 1, PM 6 and PM 24 as the young, adult and aged groups, respectively (n=14/group). CAT expression was examined by immunohistochemistry and western blot analysis. In addition, neuronal distribution was examined by NeuN immunohistochemistry. In the present study, the mean number of NeuN-immunoreactive neurons was marginally decreased in mouse and rat hippocampi during aging, although this change was not identified to be significantly different. However, CAT immunoreactivity was significantly increased in pyramidal and granule neurons in the adult mouse and rat hippocampi and was significantly decreased in the aged mouse and rat hippocampi compared with that in the young animals. CAT protein levels in the hippocampus were also lowest in the aged mouse and rat hippocampus. These results indicate that CAT expression is significantly decreased in the hippocampi of aged animals and decreased CAT expression may be closely associated with aging.</P>
Ahn, Ji Hyeon,Hong, Seongkweon,Park, Joon Ha,Kim, In Hye,Cho, Jeong Hwi,Lee, Tae-Kyeong,Lee, Jae-Chul,Chen, Bai Hui,Shin, Bich-Na,Bae, Eun Joo,Jeon, Yong Hwan,Kim, Young-Myeong,Won, Moo-Ho,Choi, Soo Y SPANDIDOS PUBLICATIONS 2017 MOLECULAR MEDICINE REPORTS Vol. No.
<P>Calbindin-D28k (CB), calretinin (CR) and parvalbumin (PV), which regulate cytosolic free Ca<SUP>2+</SUP> concentrations in neurons, are chemically expressed in γ-aminobutyric acid (GABA)ergic neurons that regulate the degree of glutamatergic excitation and output of projection neurons. The present study investigated age-associated differences in CB, CR and PV immunoreactivities in the somatosensory cortex in three species (mice, rats and gerbils) of young (1 month), adult (6 months) and aged (24 months) rodents, using immunohistochemistry and western blotting. Abundant CB-immunoreactive neurons were distributed in layers II and III, and age-associated alterations in their number were different according to the species. CR-immunoreactive neurons were not abundant in all layers; however, the number of CR-immunoreactive neurons was the highest in all adult species. Many PV-immunoreactive neurons were identified in all layers, particularly in layers II and III, and they increased in all layers with age in all species. The present study demonstrated that the distribution pattern of CB-, CR- and PV-containing neurons in the somatosensory cortex were apparently altered in number with normal aging, and that CB and CR exhibited a tendency to decrease in aged rodents, whereas PV tended to increase with age. These results indicate that CB, CR and PV are markedly altered in the somatosensory cortex, and this change may be associated with normal aging. These findings may aid the elucidation of the mechanisms of aging and geriatric disease.</P>