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A Novel Multi-Level Inverter Configuration for High Voltage Conversion System
Suh, Bum-Seok,Lee, Yo-Han,Hyun, Dong-Seok The Korean Institute of Electrical Engineers 1996 Journal of Electrical Engineering and Information Vol.1 No.2
This paper deals with a new multi-level high voltage source inverter with GTO Thyristors. Recently, a multi-level approach seems to be the best suited for implementing high voltage conversion systems because it leads to harmonic reduction and deals with safe high power conversion systems independent of the dynamic switching characteristics of each power semiconductor device. A conventional multi-level inverter has some problems; voltage unbalance between DC-link capacitors and larger blocking voltage across the inner switching devices. To solve these problems, the novel multi-level inverter structure is proposed.
Temperature Coefficient in D$_2$O Moderated Reactor(Wolsung Unit 1)
Suh, Soo-Hyun,Chang, Yo-Han,Kim, Seong yun,Kim, Dong-Hoon Korean Nuclear Society 1977 Nuclear Engineering and Technology Vol.9 No.3
천연 산화 우라늄 핵연료와 중수 감속재를 사용하는 월성 1호기에 관한 온도 계수를 조사하였다. 핵연료, 감속재 및 냉각재 온도변화에 따른 중성자의 유효 증배 인자의 변화를 계산하였다. 계산된 결과를 LATREP 전자계산 code에 의한 온도 계수 값들과 비교하였다.
Yo Han Park,김나영,Young Kwang Shim,최윤진,Ryoung Hee Nam,Yoon Jeong Choi,Min Hee Ham,JI Hyung Suh,Sun Min Lee,이창민,Hyuk Yoon,이혜승,Dong Ho Lee 대한암예방학회 2015 Journal of cancer prevention Vol.20 No.4
Background: Dextran sodium sulfate (DSS)-induced colitis mouse model is used for research of inflammatory bowel disease. The aim of this study was to establish the adequate conditions for DSS mice model, and to find useful tool to measure inflammation. Methods: The 2.5% DSS was administered to six male C57BL/6 mice and 4% DSS to eight mice at 5 or 9 weeks of age. Each group was consisted of 6 mice with control group in which vehicle was administered instead of DSS. The mice were sacrificed on the 7th day after DSS or vehicle administration. Body weight, diarrhea, and hematochezia were recorded daily. Disease activity index (DAI) score which was composed of body weight change, diarrhea, and hematochezia was measured every day. Colon length was measured after sacrifice and colon mucosal level of interleukin 1 beta (IL-1) was measured by ELISA assay. Histological score was compared between ascending and descending colon in the DSS group. Results: Colon length of five- and nine-week DSS group was significantly shorter than each control group but there was no statistical significance depending on DSS concentration or age. DAI score of 4% DSS group in nine-week was significantly higher than that five-week (P = 0.012) but there was no difference between 2.5% and 4% DSS group. The level of IL-1 in DSS mice was much higher than control group (P < 0.01), but there was no difference among several DSS groups. The histological score was higher in the descending colon than in the ascending colon but there was no statistical difference between each pair of DSS groups. Conclusions: The 4% DSS mice in nine-week was adequate for DSS-induced colitis model. DAI score was useful tool and descending colon was more appropriate site for histological evaluation of colitis than ascending colon.
Yoo, Yo-Han,Kim, Minjae,Chandran, Anil Kumar Nalini,Hong, Woo-Jong,Ahn, Hye Ryun,Lee, Gang Taik,Kang, Sungju,Suh, Dabin,Kim, Jin-O,Kim, Yeon-Ju,Jung, Ki-Hong MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.23
<P>Plant-growth-promoting bacteria (PGPB) are beneficial microorganisms that can also protect against disease and environmental stress. Silicon (Si) is the second most abundant element in soil, and is known to increase plant growth, grain yield, resistance to biotic stress, and tolerance to abiotic stress. Combined treatment of PGPB and Si has been shown to further enhance plant growth and crop yield. To determine the global effects of the PGPB and Si on rice growth, we compared rice plants treated with Paenibacillus yonginensis DCY84T (DCY84T) and Si with untreated rice. To identify the genes that respond to DCY84T+Si treatment in rice, we performed an RNA-Seq transcriptome analysis by sampling treated and untreated roots on a weekly basis for three weeks. Overall, 576 genes were upregulated, and 394 genes were downregulated in treated roots, using threshold fold-changes of at least 2 (log2) and p-values < 0.05. Gene ontology analysis showed that phenylpropanoids and the L-phenylalanine metabolic process were prominent in the upregulated genes. In a metabolic overview analysis using the MapMan toolkit, pathways involving phenylpropanoids and ethylene were strongly associated with upregulated genes. The functions of seven upregulated genes were identified as being associated with drought stress through a literature search, and a stress experiment confirmed that plants treated with DCY84T+Si exhibited greater drought tolerance than the untreated control plants. Furthermore, the predicted protein-protein interaction network analysis associated with DCY84T+ Si suggests mechanisms underlying growth promotion and stress tolerance.</P>
EFFICIENT SNUBBER CIRCUIT FOR HIGH VOLTAGE THREE-LEVEL GTO INVERTERS
Jae-Hyeong Suh,Yo-Han Lee,Bum-Seok Suh,Dong-Seok Hyun 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
A new low loss snubber circuit including overvoltage clamping circuit for three-level GTO inverter is presented. The proposed snubber circuit is effective in the restriction of the dv/dt and the overvoltage values across each GTO at turn-off and the snubber loss is less than the half that of the conventional RCD snubber circuit. In addition, there is no blocking voltage balancing problem between the inner and the outer GTOs that occurs in the case that conventional RCD snubber circuit is used in three-level inverter topology. Experimental results demonstrate that the proposed snubber circuit is very effective for a large capacity three-level GTO inverter.