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A Study on New PDP Drive Circuit with Low Voltage Device Stresses
Nam, Won-Seok,Roh, Chung-Wook,Hong, Sung-Soo,Sakong, Sug-Chin 국민대학교 생산기술연구소 2004 공학기술논문집 Vol.27 No.-
A new energy-recovery-sustain circuit suitable for a plasma display panel (PDP) application is proposed. The proposed circuit features the low device voltage/current stresses, and the inherent circulating current elimination characteristics, essential to design a power efficient and low cost plasma display driver circuit. The proposed circuit is demonstrated experimentally for driving a 42 inches plasma display panel. It is best suited in a low cost and power efficient plasma display This work was supported in part by Core Technology R&D Group, Samsung Electronics Co., Ltd.
WeiQiang Jia,Sug-Won Roh,Jae Eun Song,Aung Bo Bo,Kwang Min Cho,Kee Woong Park,Jeung Joo Lee 한국잡초학회·한국잔디학회 2021 Weed & Turfgrass Science Vol.10 No.1
Schoenoplectus juncoides is a noxious weed in paddy field of Korea. The excessive and unreasonable use of acetolactate synthase (ALS)-inhibiting herbicide caused the evolution of herbicide-resistant S. juncoides. As a part of the management of ALS-inhibiting herbicide resistance, early detection of the ALS-inhibiting herbicide resistance in S. juncoides is necessary. In this study, we evaluated three methods of rapidly detecting ALS-resistance in S. juncoides, including the cutting root test, cutting shoot test, and resistance in-season quick (RISQ) test. Three herbicide-resistant populations of S. juncoides (GR, 217R, and WR) and one susceptible population of S. juncoides (HS) collected from the Chungcheongnam-do and Jeollabuk-do of Korea served as experimental materials for the evaluation of three resistance test methods established by previous studies. In the three test methods, the GR and 217R were confirmed as resistant to flucetosulfuron and susceptible to penoxsulam. The WR was highly resistant to flucetosulfuron and penoxsulam. All the three resistance test methods have been successfully applied for identifying the ALS-inhibiting herbicide-resistant S. juncoides in-season. Especially, the result of cutting roots test demonstrated that the GR, 217R, and WR biotypes were highly resistant to flucetosulfuron with the R/S ratios of 34, 100, and 1852, respectively based on GR50. The WR biotype was highly resistant to penoxsulam with the R/S ratio of 912, whereas the GR and 217R biotypes were susceptible to penoxsulam. These in-season quick tests are likely to contribute to the use of effective herbicide in crops leading to decreased costs of labour and inputs in paddy field, and increased profits.
WeiQiang Jia,Sug-Won Roh,Sung Hwan Choi,Jong Chan Won,Soo Yong Shim,Jung-Sung Chung,Le Thi Hien,Aung Bo Bo,Kee Woong Park,Jeung Joo Lee 한국잡초학회·한국잔디학회 2021 Weed & Turfgrass Science Vol.10 No.1
Continuous use of acetolactate synthase (ALS) inhibitors has led to the selection of herbicide-resistant Sagittaria trifolia in paddy fields. Herbicide-resistant (R) S. trifolia was first reported in 2011 in Korea. The objective of this study was to investigate the level and mechanism of resistance and understand the fitness of R biotypes using R and susceptible (S) S. trifolia biotypes originated from seeds and tubers. Whole plant dose-response showed that the R biotypes originated from tubers were highly resistant to cyclosulfamuron and moderately resistant to penoxsulam and imazaquin, with R/S ratios of 250, 13 and 8, respectively. Compared to the S biotype, the R biotype originated from tuber had an amino acid substitution at the position of a Pro197-Leu residue of als gene, a well-known mutation site that could confer resistance to sulfonylurea, triazolopyrimidine, and imidazolinone herbicides. Additionally, the germination rate and growth of the S biotypes originated from seeds were lower than those of the R biotypes. The growth of the S biotypes originated from tubers was more vigorous than that of the R biotypes. Once the seed of R biotypes move to uninfected paddy fields, the germination rate of R biotypes is probably more than that of existing S biotypes. If ALS inhibitors are applied into paddy fields, R biotypes can survive and even produce tubers that can continually propagate and probably become dominant in the population in uninfected paddy fields. Thus, increasing the application rate of ALS inhibitors to kill R biotypes probably can enhance ALS-inhibitors’ selection-pressure.
Seed Dormancy and Germination Characteristics of Rumex obtusifolius
Thi Hien Le,Sug-Won Roh,Mirjalol Umurzokov,Aung Bo Bo,Weiqiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.2
Exotic weeds are considered as one of the major threats for agro-ecosystem and global food security. Since, Rumex obtusifolius is one of the dominant exotic weeds in Korean landscape, turfgrass, or river banks, there is an urgency for its efficient management to protect the Korean agro-ecosystem. This study was conducted to investigate the germination characteristics under various environmental conditions such as seed dormancy, temperature, salt stress as well as effect of soil depths on seed emergence. R. obtusifolius seeds germinated 100% until 30 days after harvesting (DAH), after that the seed germination rate started to decrease until 270 DAH. The germination rate recovered from 300 DAH and finally reached 98.3% 360 DAH. Optimum temperature for R. obtusifolius seed germination was 25/15℃ to 30/20℃ (day/night). NaCl greatly affected the germination of R. obtusifolius seeds. Less than 50% of seeds germinated at 20 mM of NaCl and ceased at 320 mM. R. obtusifolius seedling emergence was strongly inhibited by burial depth. The germination declined with increasing the soil depth and stopped where the burial depth exceeded 3 cm. These results could be useful to develop integrated exotic weed management in the R. obtusifolius infested area in Korea.