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Ga-Heon Jin,Min Woong Lee,Kyung Hoan Im,Tae Soo Lee 한국버섯학회 2014 한국버섯학회지 Vol.12 No.1
This study was initiated to investigate antioxidant, anti-acetylcholinesterase, and xanthine oxidase inhibitory activities and properties of fruiting bodies, mycelia, and fermentation culture filtrates from Phellinus igniarius. The contents of total phenols and flavonoid of fruit bodies, mycelia, and culture filtrate were 15.35-1.36 mg/g, 10.35-7.85 mg/g, and 8.25-5.36 mg/g. The 1,1- diphenyl-1-picrylhydrazyl (DPPH) radical scavenging abilities of the extracts from the fruiting bodies, mycelia, and culture filtrates were 90.25-95.60%, 78.82-85.24%, and 76.32-82.50% at 50-400 μg/mL, respectively. The chelating ability of fruiting body extract on ferrous ions was higher than those of mycelia and culture filtrates tested. The anti-acetylcholinesterase inhibitory activity of the fruiting body extract at 400 μg/mg exhibited 91.10% on AChE, which is lower than that of positive control, galanthamine (94.82%). The xanthine oxidase inhibitory activities of the fruiting bodies, mycelia, and culture extract were 85.47%, 78.13%, and 72.49% at 400 μg/mL, respectively. Overall, the fruiting body extract has better anti-acetylcholinesterase, antioxidant and xanthine oxidase inhibitory activities than those from mycelia and culture filtrate.
Jin, Ga-Heon,Lee, Min Woong,Im, Kyung Hoan,Lee, Tae Soo The Korean Society of Mushroom Science 2014 한국버섯학회지 Vol.12 No.1
This study was initiated to investigate antioxidant, anti-acetylcholinesterase, and xanthine oxidase inhibitory activities and properties of fruiting bodies, mycelia, and fermentation culture filtrates from Phellinus igniarius. The contents of total phenols and flavonoid of fruit bodies, mycelia, and culture filtrate were 15.35-1.36 mg/g, 10.35-7.85 mg/g, and 8.25-5.36 mg/g. The 1,1-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging abilities of the extracts from the fruiting bodies, mycelia, and culture filtrates were 90.25-95.60%, 78.82-85.24%, and 76.32-82.50% at $50-400{\mu}g/mL$, respectively. The chelating ability of fruiting body extract on ferrous ions was higher than those of mycelia and culture filtrates tested. The anti-acetylcholinesterase inhibitory activity of the fruiting body extract at 400 ${mu}g/mg$ exhibited 91.10% on AChE, which is lower than that of positive control, galanthamine (94.82%). The xanthine oxidase inhibitory activities of the fruiting bodies, mycelia, and culture extract were 85.47%, 78.13%, and 72.49% at 400 ${\mu}g/mL$, respectively. Overall, the fruiting body extract has better anti-acetylcholinesterase, antioxidant and xanthine oxidase inhibitory activities than those from mycelia and culture filtrate.
( Ga Eul Lee ),( Young Ju Jeong ),( Sung Nam Cho ),( Jeong Heon Lee ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
목적: Our objective was to evaluate the effect of combined use of transient bilateral ovarian artery clamping, uterine artery ligation, and Bakri balloon tamponade during cesarean section in women with placenta previa. 방법: We performed a retrospective cohort study of all cesarean deliveries performed due to placenta previa from April 2013 until June 2016 at Chonbuk National University Hospital. Charts were reviewed to determine the amount of RBC transfusion, degree of blood loss and incidence of postpartum hysterectomy and uterine artery embolization (UAE) between conventional method and combined technique to control hemorrhage during cesarean section for placenta previa. Patients with unsortable technique were excluded. The outcome was analyzed using independent t-test. 결과: There was a total of 118 cesarean deliveries for placenta previa during the study period, with two groups of 100 patients using conventional hemostatic method and 17 patients using combined hemostatic technique. There were not different between two groups in the mean amount of PRC transfusion during operation (0.88 ± 2.12 unit vs. 0.24 ± 0.66 units, respectively, p=0.22) and the index of blood loss (0.22 ± 0.13 vs. 0.23 ± 0.14, respectively, p=0.78). The incidence of postpartum hysterectomies (0.05 ± 0.22 vs. 0 ± 0, respectively, p=0.03) and postpartum care (0.13 ± 0.46 vs. 0 ± 0, respectively, p=0.01) for continuous bleeding after cesarean section were significantly low in combined technique group. 결론: Our findings show that utilization of the combined technique (transient bilateral ovarian artery clamping, uterine artery ligation, and Bakri balloon tamponade) during cesarean section for placenta previa is associated with a decreased rate of postpartum hysterectomy and additional hemostatic procedure after cesarean section.
Acidity in Precipitation and Solar North-South Asymmetry
Ga-Hee Moon,Kyoung-Yoon Ha,Seong-Hoon Kang,Byoung-Ho Lee,Ki-Beom Kim,Jung-Hee Kim,Heon-Young Chang 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.4
We are motivated by both the accumulating evidence for the connection of solar variability to the chemistry of nitrogen oxide in the atmosphere and recent finding that the Galactic cosmic-ray (GCR) influx is associated with the solar northsouth asymmetry. We have analyzed the measured pH in precipitation over the 109 stations distributed in the United States. We have found that data of pH in precipitation as a whole appear to be marginally anti-correlated with the solar asymmetry. That is, rain seems to become less acidic when the southern hemisphere of the Sun is more active. The acidity of rain is also found to be correlated with the atmospheric temperature, while not to be correlated with solar activity itself. We have carried on the analysis with two subsamples in which stations located in the east and in the west. We find that the pH data derived from the eastern stations which are possibly polluted by sulfur oxides and nitrogen oxides are not correlated with the solar asymmetry, but with the temperature. On the contrary, the pH data obtained from the western stations are found to be marginally anti-correlated with the solar asymmetry. In addition, the pH data obtained from the western stations are found to be correlated with the solar UV radiation. We conclude by briefly pointing out that a role of the solar asymmetry in the process of acidification of rain is to be further examined particularly when the level of pollution by sulfur oxides and nitrogen oxides is low.
Lee, Ga-Young,Lee, Hu-Ryul,Um, Myeong-Heon,Kang, Mi-Sook Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
To investigate the scattering layer effect of a $TiO_2$ multilayer in dye-sensitized solar cells (DSSCs), we designed a new DSSC system, assembled with a CdS-$TiO_2$ scattering layer electrode. A high-magnification SEM image exhibited hollyhock-like particles with a width of 1.5-2.0 ${\mu}m$ that were aggregated into 10-nm clumps in a hexagonal petal shape. The efficiency was higher in the DSSC assembled with a CdS-$TiO_2$ scattering layer than in the DSSC assembled with $TiO_2$-only layers, due to the decreased resistance in electrochemical impedance spectroscopy (EIS). The short-circuit current density ($J_{sc}$) was increased by approximately 7.26% and the open-circuit voltage ($V_{oc}$) by 2.44% over the 1.0 wt % CdS-$TiO_2$ composite scattering layer and the incident photon-to-current conversion efficiency (IPCE) in the maximum peak was also enhanced by about 5.0%, compared to the DSSC assembled without the CdS-$TiO_2$scattering layer.
딥 러닝 시각 지능과 경로 탐색을 통한 사람형 로봇손의 목표 물체 파지 시스템
류가현(Ga Hyeon Ryu),오지헌(Ji-Heon Oh),정진균(Jin Gyun Jeong),정환석(Hwanseok Jung),이진혁(Jin Hyuk Lee),Patricio Rivera Lopez,김태성(Tae-Seong Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
다중 물체 환경에서 사람형 로봇손이 목표 물체를 파지하기 위해서는 목표 물체 인식, 충돌 없는 경로 설정, 사람형 로봇손의 물체 파지 지능이 필요하다. 본 논문에서는 딥 러닝 Mask R-CNN 을 통해 물체를 검출하고 3D 정보를 인식한 후, RRT-Connect 경로 탐색 알고리즘으로 충돌 회피 경로를 파악하고, 최종적으로 사람형 로봇손이 다중 물체 속에서 목표 물체를 파지하고 이동하는 하드웨어 시스템을 구현한다.
불연속 전압 변조 방법 적용 범위에 따른 태양광 NPC 인버터의 DC-link 커패시터 신뢰성 분석
여가현(Ga-Hyeon Yeo),최재헌(Jae-Heon Choi),최의민(Ui-Min Choi) 전력전자학회 2023 전력전자학회 논문지 Vol.28 No.3
The voltage modulation method has a significant effect on the performance of 3-level neutral-point clamped (NPC) inverters such as efficiency and output quality. Discontinuous pulse width modulation (DPWM) has been proposed to improve efficiency by reducing the switching loss of power devices. In previous research, the output quality, power loss, and reliability of the power device were considered when the DPWM method was applied. However, the influence of the DPWM on the reliability of DC-link capacitors, one of the reliability-critical components, has not been investigated. In this paper, the effect of DPWM on the reliability of DC-link capacitors is studied in the NPC inverter. Considering the mission profile of the photovoltaic (PV) system, the accumulated damage of DC-link capacitors is analyzed at the component level first under different applied angles of DPWM. The reliability of DC-link capacitors is then evaluated at the system level by considering all capacitors of the NPC inverter. In addition, the current of the DC-link capacitor is analyzed through the experiment to validate the negative effect of the DPWM on the reliability of the DC-link capacitor.