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Kim Jeongtae,Yoon Sungho,Kim Dongwook 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
In this study, an assessment technique to determine the polarity reversal characteristics of LCC Type HVDC XLPE cable insulation materials was considered. For this purpose, the long-term polarity reversal experiment was performed using molded electrodes that can exclude the eff ects of surface discharge and surrounding insulating oil on the specimen for the 3 diff erent kinds of specimens such as AC XLPE, VSC type DC XLPE and LCC type DC XLPE under the electrical and thermal stress. As a result, in the cases of low applied electric fi eld of 3 E 0 (75 kV/mm), all kinds of specimens with diff erent experimental conditions such as electric fi eld magnitude and temperature showed very large lifetime index in the E-N (applied electric fi eld vs. polarity reversal cycle) characteristics. From Weibull statistical analysis, the shape parameter was smaller than 1, which corresponds to the early failure mode or the random failure mode. It was analyzed that the magnitude of the applied electric fi eld and temperature did not give an eff ect to the polarity reversal lifetime. Through the lightning impulse breakdown analysis for the survived specimens up to 1050 polarity reversal cycles, the impulse strength was decreased by thermal degradation rather than electrical degradation. Among the three types of specimens applied in this study, the scale parameter of the LCC type DC XLPE material was more than 1000 cycles, showing the best polarity reversal characteristics. From the above analysis, it is concluded that the polarity reversal lifetime for DC insulation material can be evaluated through the process and the electrode confi guration as-suggested in this study.
Kim, Kyunghee,Kim, Jeongtae,Min, Junhong,Ryu, Sungmin Korean Marketing Association 2017 ASIA MARKETING JOURNAL Vol.19 No.1
Despite the importance of the impact of network structure on the relationships between firms and firm performance, few studies have investigated these effects. This study investigates how network openness influences the relationships between TSI, opportunism, technological uncertainty, and supplier performance. We also try to figure out how network openness functions as a governance mechanism.
Recent Advancements in Technologies to Detect Enterohaemorrhagic Escherichia coli Shiga Toxins
Kim Jeongtae,Lee Jun Bong,Park Jaewon,Koo Chiwan,Lee Moo-Seung 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.5
Shiga toxin (Stxs)-producing enterohaemorrhagic Escherichia coli (EHEC) and Shigella dysenteriae serotype 1 are major causative agents of severe bloody diarrhea (known as hemorrhagic colitis) and hemolytic uremic syndrome (HUS) associated with extraintestinal complications such as acute renal failure and neurologic impairment in infected patients under 9 years of age. Extreme nephrotoxicity of Stxs in HUS patients is associated with severe outcomes, highlighting the need to develop technologies to detect low levels of the toxin in environmental or food samples. Currently, the conventional polymerase chain reaction (PCR) or immunoassay is the most broadly used assay to detect the toxin. However, these assays are laborious, time-consuming, and costly. More recently, numerous studies have described novel, highly sensitive, and portable methods for detecting Stxs from EHEC. To contextualize newly emerging Stxs detection methods, we briefly explain the basic principles of these methods, including lateral flow assays, optical detection, and electrical detection. We subsequently describe existing and newly emerging rapid detection technologies to identify and measure Stxs.
( Jeongtae Kim ),( Yowook Song ),( Dong Woo Kim ),( Muhammad Fiaz ),( Chan Ho Kwon ) 한국축산학회(구 한국동물자원과학회) 2018 한국축산학회지 Vol.60 No.2
Background: Maize fodder is being used as staple feed for livestock but it lacks protein and essential amino acids; lysine and tryptophan. Intercropping maize with leguminous soybean crop is promising technique under limited land resources of South Korea but it can only give considerable advantages when adequate distance is provided between corn and soybean rows. Main aim of present study was to find-out adequate distance between corn and soybean seeding rows for optimum growth, yield and nutritive value of intercropped forage. Methods: Different interrow distances between corn and soybean were evaluated under four treatments, viz. 1) Corn sole as positive control treatment 2) Zero cm between corn and soybean (control); 2) Five cm between corn and soybean; 3) 10 cm between corn and soybean, with three replicates under randomized block design. Results: Findings depicted that height and number of corn stalks and ears were similar (P > 0.05) among different treatments. Numerically average corn ear height was decreased at zero cm distance. Dry matter percentage in all components; corn stalk, corn ear and soybean was also found not different (P > 0.05) but dry matter yield in component of corn ear was lower (P < 0.05) at zero cm distance as compared to that of 5 and 10 cm interrow distances. In case of nutritive value, total digestible nutrient yield in intercropped corn was also found lower (P < 0.05) at zero cm distance than that of 5 and 10 cm interrow distances between corn and soybean seeding rows. Substantial decrease in dry matter yield of maize ear at zero cm distance might be attributed to factor of closed interrow spacing which made interplant competition more intensified for light interception, necessary for photosynthetic activity. Lower dry matter yield in ear also reduced total digestible nutrients in intercropped maize because it was determining factor in calculation of digestible nutrients. The optimum yield and nutritive value of forage at wider interrow distance i.e. 5 cm between corn and soybean might be due to adequate interseed distance. Conclusion: Conclusively, pattern of corn and soybean seeding in rows at 5 cm distance was found suitable which provided adequate interrow distance to maintain enough mutual cooperation and decreased competition between both species for optimum production performance and nutritive value of intercropped forage.
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Jeongtae Kim,Woobin Kim,Hung-Sok Park,Ji-Won Kang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of 85℃. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Jeongtae Kim,배영한 재단법인 서암순창장학회 2017 Journal of Marketing Thought Vol.4 No.2
Reinforcing global competitiveness of the pharmaceutical industry through development of new drugs is a key task and target for pharmaceutical industry and government. As part of this goal, Korea government has been dedicating to an implementation of various systems since 2000s in order to correct the wrong practices of the industries and to reduce national medical expenses. The sliding scale rebate-medical reimbursement system in 2009, Dual punishment of a rebate in 2010 and the Sunshine Act in 2018 would have contributed to a competitive environment that the pharmaceutical companies can strive for a development of new products and its quality improvement rather than focus on appealing to financial benefits to the hospitals, clinics and pharmacies. In particular, the government has cut down the price of original drugs and generic drugs sharply, of which patents have expired through the reorganized reimbursement policy and the advancement policy of the pharmaceutical industry since 2012, thereby reinforcing ability to block the source of provision of a rebate and to further promote research and development. However, there are still many unexpected side effects in the process of establishing the system because of not having sufficient competitiveness in new drug development. For example, the domestic companies have been forced into a co-marketing of the original products for short-term sales outcome and obtaining prescription records by granting the modified profit. Wholesale profit has been reduced due to squeezed distribution margins. In this study, we will explore alternatives to these major adverse events and suggest ways to improve them through collaboration between industries or industry and government.
Kim, Jeongtae,Song, Yowook,Kim, Dong Woo,Fiaz, Muhammad,Kwon, Chan Ho The Korean Society of Grassland and Forage Science 2017 한국초지조사료학회지 Vol.37 No.1
In attempt to avoid crop damage through wild bird's picking, this study was designed with aim to evaluate several pre-sowing soybean seed coatings for optimum yield in corn-soybean mixed forage. It was investigated under four cropping treatments, viz. 1) corn sole, 2) corn mixed with soybean without any coating, 3) corn with iron coated soybean and 4) corn with thiram coated soybean. Each treatment had three replicates and corn sole was control treatment. Pioneer (P1184) and crossbred ($PI483463{\times}Hutcheson$) seeds were used for corn and soybean, respectively. The trial was conducted under randomized block design from $5^{th}$ June to $23^{rd}$ September, 2015. Data were an alyzed through ANOVA technique using SAS9.1.3 software. Results depicted that survivability of soybean against wild birds damage was found better (p<0.05) in thiram coating which was higher than iron coating and control treatment but later on thiram coating had adverse effects on subsequent growth of soybean plants. Corn stalk height was decreased (p<0.05) in thiram coating, whereas corn ear height was reduced in iron coating treatment. Iron coating enhanced (p<0.05) height of soybean plant (p<0.05) better than that of thiram coating. Soybean seed coatings didn't influence dry matter yield and nutritive value in terms of total digestible nutrients yield in corn soybean mixed forage. Conclusively, although presowing thiram coating enhanced survivability of soybean plants against wild bird damage but had adverse effects on its subsequent growth. However, soybean seed coatings didn't influence yield and nutritive value of corn soybean intercropping forage.