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직접 토크 제어를 이용한 리럭턴스 동기 전동기의 쵀대 효율제어
박홍일(Hong-il Park),김남훈(Nam-Hun Kim),최경호(Kyeon-Ho Choi),김동희(Dong-Hee Kim),김민희(Min-Huei Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents an implementation of direct torque control(DTC) of Reluctance Synchronous Motor(RSM) with an efficiency optimization using the 32M DSP TMS320C31<br/> The influence of iron loss can not neglected as high speed and precision torque control of RSM, so the optimal current ration between torque current and exiting current analytically derived to drive RSM at maximum efficiency. For RSM, torque dynamics can be maintained even with controlling the flux level because the generated torque is directly proportional to the stator current The experimental results for an RSM are presented to validate the applicability of the proposed method The developed control system is shown high efficiency features with l.0Kw RSM having 257 ratio of d/q reluctance.
2015년 인삼재배지에서의 인삼뿌리썩음병원균의 분리동정 및 토양밀도검정
Mei Lan Jin,Kyeon Hun Park,Sung Woo Lee,Dong Yun Hyun,Seung Ho Lee 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : Ginseng (Panax ginseng C.A. Meyer) is one of the most important medicinal plants in Korea, but its yields are often reduced by a variety of root pathogens. The root rot of ginseng is a destructive soil-borne disease caused by Cylindrocarpon destructans (teleomorph: Ilyonectria radicicola). To monitor contamination with C. destructans in ginseng harvested in 2015 were sampled from 57 different growing fields. The spore number of C. destructans was quantified by use of a specific primers and selective media (radicicol) in soils of ginseng fields. Methods and Results : The ginseng samples were surface-sterilized and placed on potato dextrose agar plates for 7 day incubation at 20℃. Emerging fungal colonies were counted primarily based on colony and conidia morphology. Further species level identification was confirmed by ITS rDNA sequencing. For quantification of the soil-borne C. destructans, the genomic DNA was extracted from the soil using a NucleoSpin soil kit (MN, Germany). Density of C. destructans was determined by species specific real time PCR (qPCR). The qPCR was completed by running a melting curve analysis. Conclusion : The C. destructans associated with root rot disease of ginseng were detected in more than 60% in pyeongtaek-1, pochenon-1, jecheon-1, chungju-1 and jinan-4. As results of the study, the correlation between pathogen density and identification clearly clarified in the soil.
병원성에 따른 인삼뿌리썩음병원균의 유전적 및 균학적 특성 연구
Seung Ho Lee,Mun Won Seo,Kyeon Hun Park,Sung Woo Lee,Dong Yun Hyun 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : Ginseng (Panax ginseng C.A. Meyer) is one of the most important medicinal plants in Korea, but its yields are often reduced by a variety of root pathogens. The root rot of ginseng is a destructive soil-borne disease caused by Cylindrocarpon destructans (teleomorph: Ilyonectria radicicola). Methods and Results : Ilyonectria radicicola and its Cylindrocarpon-like anamorph represent a species complex that is commonly associated with root rot disease symptoms on virulence. During the course of this study, several species could be distinguished from I. radicicola sensu stricto based on morphological and culture characteristics. As results of investigated culture characteristics, optimal temperature for mycelial growth of isolates were 20℃, and colony pattern and color were slightly different on PDA. Isolates of I. radicicola were analyzed for their genetic relatedness based on several genes and microsatellite region. I. radicicola group was divided into two small groups. Conclusion : Therefore, we were able to confirm pathogenicity and genetic difference between the isolates in each of the groups of the pathogen. Among these isolates, 21.5% were classified as highly virulent and 78.5% were weakly virulent. *(Corresponding