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Song, Jun-Seop,Lee, Young-Seon,Hwang, Minki,Lee, Jung-Kee,Li, Changyong,Joung, Boyoung,Lee, Moon-Hyoung,Shim, Eun Bo,Pak, Hui-Nam The Korean Society of Pharmacology 2016 The Korean Journal of Physiology & Pharmacology Vol.20 No.5
Although 3D-complex fractionated atrial electrogram (CFAE) mapping is useful in radiofrequency catheter ablation for persistent atrial fibrillation (AF), the directions and configuration of the bipolar electrodes may affect the electrogram. This study aimed to compare the spatial reproducibility of CFAE by changing the catheter orientations and electrode distance in an in -silico left atrium (LA). We conducted this study by importing the heart CT image of a patient with AF into a 3D-homogeneous human LA model. Electrogram morphology, CFAE-cycle lengths (CLs) were compared for 16 different orientations of a virtual bipolar conventional catheter (conv-cath: size 3.5 mm, inter-electrode distance 4.75 mm). Additionally, the spatial correlations of CFAE-CLs and the percentage of consistent sites with CFAE-CL<120 ms were analyzed. The results from the conv-cath were compared with that obtained using a mini catheter (mini-cath: size 1 mm, inter-electrode distance 2.5 mm). Depending on the catheter orientation, the electrogram morphology and CFAE-CLs varied (conv-cath: $11.5{\pm}0.7%$ variation, mini-cath: $7.1{\pm}1.2%$ variation), however the mini-cath produced less variation of CFAE-CL than conv-cath (p<0.001). There were moderate spatial correlations among CFAE-CL measured at 16 orientations (conv-cath: $r=0.3055{\pm}0.2194$ vs. mini-cath: $0.6074{\pm}0.0733$, p<0.001). Additionally, the ratio of consistent CFAE sites was higher for mini catheter than conventional one ($38.3{\pm}4.6%$ vs. $22.3{\pm}1.4%$, p<0.05). Electrograms and CFAE distribution are affected by catheter orientation and electrode configuration in the in-silico LA model. However, there was moderate spatial consistency of CFAE areas, and narrowly spaced bipolar catheters were less influenced by catheter direction than conventional catheters.
( Changyong Choe ),( Young-hun Jung ),( Yoon Jung Do ),( Hee-sung Kang ),( Jae-gyu Yoo ),( Chan-lan Kim ),( Ui-hyung Kim ),( Ru-hui Song ),( Jinho Park ) 한국동물위생학회 2018 한국동물위생학회지 (KOJVS) Vol.41 No.3
Blood tests have been used to develop treatment plans, such as disease diagnosis, treatment effect, and prognosis determination in livestock. The present study examined changes in the blood count, including RBCs, WBCs, and platelets, before and after grazing among the Korean native cattle grazing from spring to autumn. The study compared the blood count of livestock group (A, n=34) that returned from the rangeland to cowshed every evening and livestock group (B, n=21) that were not returned from the rangeland to cowshed every evening during the grazing period. Hematological parameters such as RBC, hemoglobin, hematocrit, MCV, and WBC, neutrophil, eosinophil, monocyte, and lymphocyte were determined using a blood cell analyzer. Livestock group (A) showed significant differences in the values of RBC, MCV, MCHC, WBC, EOS, and LYM. Livestock group (B) showed significant differences in the values of RBC, Hb, HCT, MCV, MCH, PLT, NEU, and BAS. In particular, the RBC count decreased after grazing when compared with that before grazing. Compared with that before grazing, low RBC count was maintained from the first to fifth month of grazing. The WBC count increased from the fourth month of grazing, whereas the EOS count increased from the second month of grazing. These results suggest that the values of RBC and WBC vary before and after grazing, and also with the grazing period. Furthermore, it is necessary to develop a detailed feeding management based on these values of blood analysis for livestock that are raised continuously in the rangeland.
Choe, Changyong,Jung, Young-Hun,Do, Yoon Jung,Kang, Hee-Sung,Yoo, Jae-Gyu,Kim, Chan-Lan,Kim, Ui-Hyung,Song, Ru-hui,Park, Jinho The Korean Society of Veterinary Service 2018 韓國家畜衛生學會誌 Vol.41 No.3
Blood tests have been used to develop treatment plans, such as disease diagnosis, treatment effect, and prognosis determination in livestock. The present study examined changes in the blood count, including RBCs, WBCs, and platelets, before and after grazing among the Korean native cattle grazing from spring to autumn. The study compared the blood count of livestock group (A, n=34) that returned from the rangeland to cowshed every evening and livestock group (B, n=21) that were not returned from the rangeland to cowshed every evening during the grazing period. Hematological parameters such as RBC, hemoglobin, hematocrit, MCV, and WBC, neutrophil, eosinophil, monocyte, and lymphocyte were determined using a blood cell analyzer. Livestock group (A) showed significant differences in the values of RBC, MCV, MCHC, WBC, EOS, and LYM. Livestock group (B) showed significant differences in the values of RBC, Hb, HCT, MCV, MCH, PLT, NEU, and BAS. In particular, the RBC count decreased after grazing when compared with that before grazing. Compared with that before grazing, low RBC count was maintained from the first to fifth month of grazing. The WBC count increased from the fourth month of grazing, whereas the EOS count increased from the second month of grazing. These results suggest that the values of RBC and WBC vary before and after grazing, and also with the grazing period. Furthermore, it is necessary to develop a detailed feeding management based on these values of blood analysis for livestock that are raised continuously in the rangeland.
Park, Changyong,Hwang, Jeonguk,Hwang, Yeon-Taek,Song, Chiho,Ahn, Suhyun,Kim, Hak-Sung,Ahn, Heejoon Elsevier 2017 ELECTROCHIMICA ACTA Vol.246 No.-
<P><B>Abstract</B></P> <P>In this work, cobalt/cobalt oxide (Co-CoOx) core-shell nanoflakes were directly grown on flexible graphite felt (GF) using a facile one-step intense pulsed white light (IPWL) irradiation method. They were then used as a battery-type positive electrode for a high-performance asymmetric hybrid supercapacitor, which exhibited high rate capability and a long cycle life. The interconnected Co-CoOx thin nanoflakes grown on the GF offer large reaction sites and enough space for easy OH<SUP>−</SUP> ion transport due to their 3-dimensionally interconnected network structures. Cobalt metal at the core of the nanoflakes, directly connected to the current collector of the GF, provided pathways for electrons between the cobalt oxide and GF, leading to low internal resistance and high rate capability. The Co-CoOx/GF electrode had a high specific capacity of 108mAhg<SUP>−1</SUP> at a specific current of 1Ag<SUP>−1</SUP> and maintained a capacity of 71mAhg<SUP>−1</SUP> at a high specific current of 20Ag<SUP>−1</SUP>. A two-terminal asymmetric hybrid supercapacitor, assembled using Co-CoOx/GF as the positive electrode and activated carbon as the negative electrode with gel-electrolyte (PVA/KOH), exhibited an energy density of 30.1 Wh kg<SUP>−1</SUP> at a power density of 0.86kWkg<SUP>−1</SUP> and a high retention of 13.0 Wh kg<SUP>−1</SUP> at a power density of 20.4kWkg<SUP>−1</SUP>. In addition, the asymmetric device showed excellent cycling stability, with 114% capacity retention after 10,000 cycles.</P>
Sangyun Hwang,Changyong Song,Byeong-Gwan Cho,Taeyeong Koo,Sungdae Ji,Beongki Cho,Ki Bong Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
Strongly intertwined interaction among spin, orbital and charge degrees of freedom is the essence to induce emergent materials properties, and the investigation to understand their interplay has been actively pursued. In particular, resonant X-ray scattering technique has demonstrated powerful applications in unveiling their long-range ordering behavior with its enhanced sensitivity to the aforementioned degree of freedom. Here, we further demonstrated the spectroscopic application of the technique by providing experimental evidence to reveal spin polarizations in 4f and 5d orbital of the magnetic Tm ions with the orbital-selectivity, which introduced a route to understand fundamental mechanism of spin polarization in the compound. The enhanced sensitivity of the resonant X-ray scattering to various electric multipole transitions expects to find strong applications in studying various spin and polar ordering in materials to include high-order moments.
Jun-Seop Song,Young-Seon Lee,Minki Hwang,Jung-Kee Lee,Changyong Li,Boyoung Joung,Moon-Hyoung Lee,Eun Bo Shim,Hui-Nam Pak 대한생리학회-대한약리학회 2016 The Korean Journal of Physiology & Pharmacology Vol.20 No.5
Although 3D-complex fractionated atrial electrogram (CFAE) mapping is useful in radiofrequency catheter ablation for persistent atrial fibrillation (AF), the directions and configuration of the bipolar electrodes may affect the electrogram. This study aimed to compare the spatial reproducibility of CFAE by changing the catheter orientations and electrode distance in an<i> in -silico </i>left atrium (LA). We conducted this study by importing the heart CT image of a patient with AF into a 3D-homogeneous human LA model. Electrogram morphology, CFAE-cycle lengths (CLs) were compared for 16 different orientations of a virtual bipolar conventional catheter (conv-cath: size 3.5 mm, inter-electrode distance 4.75 mm). Additionally, the spatial correlations of CFAE-CLs and the percentage of consistent sites with CFAECL<120 ms were analyzed. The results from the conv-cath were compared with that obtained using a mini catheter (mini-cath: size 1 mm, inter-electrode distance 2.5mm). Depending on the catheter orientation, the electrogram morphology and CFAE-CLs varied (conv-cath: 11.5±0.7% variation, mini-cath: 7.1±1.2% variation), however the mini-cath produced less variation of CFAE-CL than conv-cath (p<0.001). There were moderate spatial correlations among CFAE-CL measured at 16 orientations (conv-cath: r=0.3055±0.2194 vs. mini-cath: 0.6074±0.0733, p<0.001). Additionally, the ratio of consistent CFAE sites was higher for mini catheter than conventional one (38.3±4.6% vs. 22.3±1.4%, p<0.05). Electrograms and CFAE distribution are affected by catheter orientation and electrode configuration in the<i> </i><i>in -silico</i> LA model. However, there was moderate spatial consistency of CFAE areas, and narrowly spaced bipolar catheters were less influenced by catheter direction than conventional catheters.
Development of Actuation System forWearable Robots using Spiral Spring
Yongtae Kim,Changyong Song,Jaeheung Park 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Wearable robots, or exoskeleton robots, are getting great attention because of the increasing need for seniors, disabled people, and workers in extreme environments. One of the most important requirements of the exoskeleton robot is preventing fatigues of these people. Although exoskeleton robots have been developed, there are still limitations on the user’s comfort and detection of his or her intention of motion. To improve on these aspects, spiral spring and sensor band are proposed to be used as actuation and sensor components in this paper. The spiral spring’s efficiency for wearable robots is investigated theoretically and the experiments using the spiral spring and sensor band are conducted. The experimental results demonstrate the proposed actuation and sensor system could improve the performance of the exoskeleton robots.
Immersive Stereoscopic 3D System with Hand Tracking in Depth Sensor
Yu, Sunjin,Song, Eungyeol,Yoon, Changyong Korean Institute of Intelligent Systems 2018 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.18 No.2
Recently, interest in immersive tele-conference is increasing. Conventional 2D images cannot provide a stereoscopic effect, but stereoscopic 3D (S3D) images can provide a more realistic image to people. Also, hand tracking technology is an interesting research area, in the field of human computer interaction. Hand tracking technology that tracks and recognizes human hand movements has made it possible to provide a new concept of natural user interface. A depth sensor such as Kinect provides color information and depth information at the same time. In this paper, we propose an immersive S3D system by generating stereoscopic images using depth image based rendering technology and applying 3D hand tracking and augmented reality technology.