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Antifungal Activity-Guided Analysis of Actinostemma lobatum Extracts through Serial Sub-fractions
Seonwoo Choi,Song Hee Lee,Byeong Su Hwang,Young Taek Oh,전준현 한국식물병리학회 2024 Plant Pathology Journal Vol.40 No.1
Plants are treasure trove of novel compounds that have potential for antifungal chemicals and drugs. In our previous study, we had screened plant extracts obtained from more than eight hundred plant materials collected in Korea, and found that butanol fraction of the Actinostemma lobatum were most potent in suppressing growth of diverse fungal pathogens of plants. Here in this study, we describe further analysis of the butanol fraction, and summarize the results of subsequent antifungal activity test for the sub-fractions against a selected set of plant pathogenic fungi. This line of analyses allowed us to identify the sub-fractions that could account for a significant proportion of observed antifungal activity of initial butanol fraction from A. lobatum. Further analysis of these sub-fractions and determination of structure would provide the shortlist for novel compounds that can be a lead to new agrochemicals.
Active Cell Balancing Circuit for Series-connected Battery Cells
Seonwoo Jeon,Jae-Jung Yun,Sungwoo Bae 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a cell-balancing circuit for a series-connected battery string. The proposed cell equalizer is an active cell-balancing circuit with a multiwinding transformer based on a forward DC-DC converter. The advantage of the proposed cell balancing circuit is that it can use less number of active power switches than other forward converter circuits. The proposed circuit operates for all cells to be equalized simultaneously. Thus, this balancing circuit is faster than a bi-directional forward converter in the literature. This paper presents a simulation study to verify the feasibility of the proposed circuit with PSIM simulation software. Simulation results proved that each initial unbalanced cell is equally balanced by the proposed cell-balancing circuit.
A Low-luminance Compensation Current Driver for AMOLED Displays
Seonwoo Yeom,Minhyun Jin,Donggun Lee,Kyujin Kim,Soo Youn Kim 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.1
A Feedback Trans-conductance (FB-Gm) current-mode driver with a charge-transfer circuit is proposed to achieve ultra-low current drivability (≤ 2 ㎁). By using an FB-Gm current-mode driver, both threshold-voltage and mobility variations can be compensated. In addition, an initialization technique that uses a charge-transfer circuit is proposed to handle an ultra-low current of approximately 2 ㎁ with fast driving speed. The simulation results show that the proposed current-mode driver can compensate for 2 ㎁ of current within 10 ㎲ of one-row time with 10 ㎂/channel of static-current consumption. Here, 1.5 ㏀ of series resistance and 25 pF of shunt capacitance, which represent doublewide ultra XGA (DWUXGA) AMOLED displays, are used for accurate simulation.
Analysis of a Symmetric Active Cell Balancer with a Multi-winding Transformer
Seonwoo Jeon,Myungchin Kim,Sungwoo Bae 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
This paper analyzes a symmetric active cell balancer for a battery management system. The considered cell balancer uses a forward converter in which the circuit structure is symmetric. This cell-balancing method uses fewer switches and is simpler than the previously proposed active cellbalancing circuits. Active power switches of this cell-balancing circuit operate simultaneously with the same pulse width modulation signals. Therefore, this cell-balancing circuit requires less time to be balanced than a previous bidirectional-forward-converter-based cell balancer. This paper analyzes the operational principles and modes of this cell balancer with computer-based circuit simulation results as well as experimental results in which each unbalanced cell is equalized with this cell balancer. The maximum power transfer efficiency of the investigated cell balancer was 87.5% from the experimental results. In addition to the experimental and analytical results, this paper presents the performance of this symmetric active cell-balancing method.