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Kim, Myeong-Seong,Bak, Seong-Min,Lee, Suk-Woo,Cho, Byung-Won,Roh, Kwang Chul,Kim, Kwang-Bum Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>Herein, we report on Li<SUB>3</SUB>V<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> (LVP)/reduced graphene oxide (rGO) multilayer composites prepared via a sequential adsorption method and subsequent heat treatment, and their use as cathodes for high-rate lithium-ion batteries. The sequential adsorption process includes adsorbing oppositely charged components of anionic inorganic species and cationic head of a surfactant adsorbed to graphite oxide sheets, which is a key step in the fabrication of the LVP/rGO multilayer composites. The multilayer structure has open channels between the highly conductive rGO layers while achieving a relatively high tap density, which could effectively improve the rate capability. Consequently, the LVP/rGO multilayer composites exhibit a high tap density (0.6 g cm<SUP>−3</SUP>) and good electrochemical properties. Specifically, in the voltage range of 3.0–4.3 V, the composite exhibits a specific capacity of 131 mAh g<SUP>−1</SUP> at 0.1C, a good rate capabilities (88% capacity retention at 60C), and long cycling performance (97% capacity retention after 500 cycles at 10C). Moreover, in the extended voltage range of 3.0–4.8 V, it exhibits a high specific capacity of 185 mAh g<SUP>−1</SUP> at 0.2C, a good rate capability (66% capacity retention at 30C), and stable cycling performance (96% capacity retention after 500 cycles at 10C).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surfactant assisted self-assembly of LVP/rGO multilayer composite. </LI> <LI> Alternating layers of LVP nanoparticles and rGO in multilayer composite. </LI> <LI> High tap density of LVP/rGO multilayer composite with nanoscale open channels. </LI> <LI> Excellent rate and cycling performance of the composite. </LI> </UL> </P>
Kim Doyun,Bak Myeong Seong,Park Haney,Baek In Seon,Chung Geehoon,박재현,Ahn Sora,Park Seon-Young,배현수,Park Hi-Joon,김선광 한국뇌신경과학회 2023 Experimental Neurobiology Vol.32 No.3
Quantification of tyrosine hydroxylase (TH)-positive neurons is essential for the preclinical study of Parkinson’s disease (PD). However, manual analysis of immunohistochemical (IHC) images is labor-intensive and has less reproducibility due to the lack of objectivity. Therefore, several automated methods of IHC image analysis have been proposed, although they have limitations of low accuracy and difficulties in practical use. Here, we developed a convolutional neural network-based machine learning algorithm for TH+ cell counting. The developed analytical tool showed higher accuracy than the conventional methods and could be used under diverse experimental conditions of image staining intensity, brightness, and contrast. Our automated cell detection algorithm is available for free and has an intelligible graphical user interface for cell counting to assist practical applications. Overall, we expect that the proposed TH+ cell counting tool will promote preclinical PD research by saving time and enabling objective analysis of IHC images.
Kim, Hyun-Kyung,Bak, Seong-Min,Lee, Suk Woo,Kim, Myeong-Seong,Park, Byeongho,Lee, Su Chan,Choi, Yeon Jun,Jun, Seong Chan,Han, Joong Tark,Nam, Kyung-Wan,Chung, Kyung Yoon,Wang, Jian,Zhou, Jigang,Yang, Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.4
<P>Graphene nanomeshes (GNMs) with nanoscale periodic or quasi-periodic nanoholes have attracted considerable interest because of unique features such as their open energy band gap, enlarged specific surface area, and high optical transmittance. These features are useful for applications in semiconducting devices, photocatalysis, sensors, and energy-related systems. Here, we report on the facile and scalable preparation of multifunctional micron-scale GNMs with high-density of nanoperforations by catalytic carbon gasification. The catalytic carbon gasification process induces selective decomposition on the graphene adjacent to the metal catalyst, thus forming nanoperforations. The pore size, pore density distribution, and neck size of the GNMs can be controlled by adjusting the size and fraction of the metal oxide on graphene. The fabricated GNM electrodes exhibit superior electrochemical properties for supercapacitor (ultracapacitor) applications, including exceptionally high capacitance (253 F g(-1) at 1 A g(-1)) and high rate capability (212 F g(-1) at 100 A g(-1)) with excellent cycle stability (91% of the initial capacitance after 50000 charge/discharge cycles). Further, the edge-enriched structure of GNMs plays an important role in achieving edge-selected and high-level nitrogen doping.</P>
우승희,Kim Yoo Rim,Bak Myeong Seong,Chung Geehoon,Kim Sang Jeong,Kim Sun Kwang 한국뇌신경과학회 2022 Experimental Neurobiology Vol.31 No.5
Itch and pain are distinct sensations that share anatomically similar pathways: from the periphery to the brain. Over the last decades, several itchspecific neural pathways and molecular markers have been identified at the peripheral and spinal cord levels. Although the perception of sensation is ultimately generated at the brain level, how the brain separately processes the signals is unclear. The primary somatosensory cortex (S1) plays a crucial role in the perception of somatosensory information, including touch, itch, and pain. In this study, we investigated how S1 neurons represent itch and pain differently. First, we established a spontaneous itch and pain mouse model. Spontaneous itch or pain was induced by intradermal treatment with 5-HT or capsaicin on the lateral neck and confirmed by a selective increase in scratching or wiping-like behavior, respectively. Next, in vivo two-photon calcium imaging was performed in awake mice after four different treatments, including 5-HT, capsaicin, and each vehicle. By comparing the calcium activity acquired during different sessions, we distinguished the cells responsive to itch or pain sensations. Of the total responsive cells, 11% were both responsive, and their activity in the pain session was slightly higher than that in the itch session. Itch- and painpreferred cells accounted for 28.4% and 60.6%, respectively, and the preferred cells showed the lowest activity in their counter sessions. Therefore, our results suggest that S1 uses a multiplexed coding strategy to encode itch and pain, and S1 neurons represent the interaction between itch and pain.
성민호 ( Min-ho Seong ),박종식 ( Jong-sik Bak ),윤도경 ( Do-kyung Youn ),김형수 ( Hyeong-su Kim ),고병효 ( Byeong-hyo Ko ),함정민 ( Jeong-min Ham ),정명호 ( Myeong-ho Jeong ) 한국동물위생학회(구 한국가축위생학회) 2020 韓國家畜衛生學會誌 Vol.43 No.4
Coxiella burnetii is the causative agent of Q fever which is a zoonosis occuring in both humans and animals worldwide. The purpose of this study was to investigate the seroprevalence of C. burnetii in Korean native goat in Gyeongnam province, Korea. A total of 1,365 goat blood samples from 273 farms in Gyeongnam province were collected between 2018 and 2019. Among them, 177 (13.0%) samples out of 71 (26.0%) farms were seropositive for C. burnetii by ELISA. Seroprevalence were 15.4% and 10.9% in 2018 and 2019, respectively. According to the region, seroprevalence in western, central, eastern, northern and southern areas of Gyeongnam province were 16.6%, 17.8%, 8.0%, 11.6% and 10.8%, respectively. Seroprevalence was increased with breeding scale (Head<10:7.0%, 10≤Head<50:8.7%, 50≤Head<100:13.6%, 100≤Head:28.8%). Seroprevalence according to the season showed highest in summer (18.9%) and lowest in winter (9.4%). These results indicated that C. burnetii infection is widespread among Korean native goats of Gyeongnam province in Korea and further study needs to prevent the circulation of other livestock with Korean native goat.
고속선 자갈궤도 구간 레일연마를 통한 선로 품질개선 효과 분석
전일식(Jeon, Il-Sik),김명수(Kim, Myeong-Sug),조임구(Cho, Im-Koo),전승진(Jeon, Seung-Jin),박성백(Park, Seong-Bak) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
고속철도 자갈도상궤도에서는 열차의 반복적인 충격 및 다짐작업 등으로 인한 도상자갈의 마모가 발생하게 되며 이는 도상지지력 저하로 인한 궤도틀림 발생의 주요원인이 된다. 또한 설빙 등으로 인한 레일표면결함은 열차충격으로 인한 뜬침목 발생 유발 등 궤도틀림을 가속화 시킴에 따라 주기적인 레일연마를 통해 레일단면을 최적화 시키고 있다. 본 연구에서는 경부고속철도 자갈도상궤도에서 마모된 도상자갈을 교환한 개소의 레일연마 작업 후 선로상태를 분석하였으며, 레일관리를 통한 유지보수 최적화 방안을 검토하였다. In ballasted track on HSL, the ballast wear due to tamping work, train shock and repetitive operation. It is a major cause of track irregularity occurred due to track bearing capacity decrease. Also, rail surface defects due to flying snow(ice) is accelerated track irregularity and floating sleepers to optimize the rail cross-section through the rail grinding periodic. In this study, to analyze the state of the track quality that rail grinding work after the point where ballast cleaning section on Gyeong-bu HSL, and we investigated the optimization plan of track maintenance through the management of the rail.