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High Performance Switched Reluctance Motor Drive for Automobiles using C-dump Converters
Sang-Hoon Song,Yong-Ho Yoon,Tae-Won Lee,Yeun-Chung Kim 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Small electric motors in an automobile perform various tasks such as engine cooling, pumping, and in heating, ventilating, and air-conditioning (HVAC) system. At present, most of dc motors are supplied by 12V or 24V batteries. However, DC motors surfer from lack of efficiency, low life cycles and unreliability. Therefore, there is a growing interest in substituting DC motors for advanced AC motors including switched reluctance motors. Although there are several other forms SRM converters, they are either unsatisfactory to the control performance or unsuitable for the 12V-battery powered 3-phase SRM drives. Taking into account the requirement for effective operation and simplicity structure of converter in the limited internal environment of automobiles, the author inclines toward selecting the modified C-dump converter as well as the energy efficient C-dump converter. This is so that more economical and efficient converter topology in automobile industries can be utilized. This paper describes the foundation for the design and development of a 12V-250W-3000rpm SRM drives for automobiles. Furthermore, complete circuit, computer simulation and experiment results are presented to verify the performance of the C-dump converters.
( Sang Kyung Jung ),( Kyung Ah Kim ),( So Young Ha ),( Hyun Kyo Lee ),( Young Doo Kim ),( Bu Hyun Lee ),( Woo Hyun Paik ),( Jong Wook Kim ),( Won Ki Bae ),( Nam Hoon Kim ),( June Sung Lee ),( Yoon Jun 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.1
Background/Aims: This study investigated the antiviral effects of tenofovir disoproxil fumarate (TDF) monotherapy in nucleos(t)ide analogue (NA)-naive and NA-experienced chronic hepatitis B (CHB) patients. Methods: CHB patients treated with TDF monotherapy (300 mg/day) for ≥12 weeks between December 2012 and July 2014 at a single center were retrospectively enrolled. Clinical, biochemical, and virological parameters were assessed every 12 weeks. Results: In total, 136 patients (median age 49 years, 96 males, 94 HBeAg positive, and 51 with liver cirrhosis) were included. Sixty-two patients were nucleos(t)ide (NA)-naive, and 74 patients had prior NA therapy (NA-exp group), and 31 patients in the NA-exp group had lamivudine (LAM)-resistance (LAM-R group). The baseline serum hepatitis B virus (HBV) DNA level was 4.9±2.3 log IU/mL (mean±SD ), and was higher in the NA-naive group than in the NA-exp and LAM-R groups (5.9±2.0 log IU/mL vs 3.9±2.0 log IU/mL vs 4.2±1.7 log IU/mL, P<0.01). The complete virological response (CVR) rate at week 48 in the NA-naive group (71.4%) did not differ significantly from those in the NA-exp (71.3%) and LAM-R (66.1%) groups. In multivariate analysis, baseline serum HBV DNA was the only predictive factor for a CVR at week 48 (hazard ratio, 0.809; 95% confidence interval, 0.729.0.898), while the CVR rate did not differ with the NA experience. Conclusions: TDF monotherapy was effective for CHB treatment irrespective of prior NA treatment or LAM resistance. Baseline serum HBV DNA was the independent predictive factor for a CVR. (Clin Mol Hepatol 2015;21:41-48)
Toxic Fungi Protein Classification Using Task Specific BERT
Sung-Yoon Ahn,Sung-Hoon Kim,Ji-Soo Tak,Sang-Woong Lee 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
From Covid-19 we have witnessed the destructive power of infectious diseases. To prevent such catastrophes from occurring, it is crucial to prevent an outbreak of any infectious disease. As it is well known for bacteria and viruses to cause such outbreaks, some fungal species also cause harmful reactions. In this paper, we attempt to classify toxic fungi protein sequences through the help of protBERT a BERT-based protein language model. Our experiment results reveal the effectiveness of our proposed approach as it shows 99% accuracy and F1 score of 0.9901 in the classification of toxic fungi protein sequences.
Sang Yoon Kim,Ju-Hee An,Kyung Hoon Park,Sang Yeob Lee,Hang-Yeon Weon,Mee-Kyung Sang,Ju-Hee Lee,Jaekyeong Song 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.2
Inoculation of beneficial bacteria such as Bacillus velezensis strains has been widely used to stimulate plant growth and suppress the activity of fungal pathogens in agricultural fields including ginseng (Panax ginseng). However, there is little information on changing microbial abundances and community structure. In this study, we investigated the inoculum populations and pathogenic abundances (Rhizoctonia solani and Pythium ultimum) by quantitative real time PCR (qPCR) and the shift of bacterial communities by Illumina Miseq based on 16s rRNA gene in the soil cultivated with ginseng under the two different inoculation methods (drenching and seed soaking). The population of inoculated microbe (Bacillus velezensis CC112) has maintained its relevant proportion for 4 to 9 days during the experiment in a ginseng-cultivating soil. The abundance of pathogenic fungi was effectively suppressed by the application of the Bacillus strain against Rhizoctonia solani (39%) and Pythium ultimum (7%), respectively as compared to the control (no application) without altering significant bacterial community structure in a ginseng soil. The inoculation of B. velezensis CC112 maintained its abundance almost until two weeks after the inoculation without significantly altering bacterial community structures in a ginseng soil. Conclusively, the inoculation of beneficial microbes is capable of potentially suppressing plant pathogenic fungi and improving crop productivity in the field cultivated with ginseng, replacing agrochemicals.