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- 저자 : Wang Yijie (검색결과 19 건)
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Yijie Wang,Xiangjun Zhang,Wei Wang,Dianguo Xu 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
This paper presents a new kind of digital control metal halide lamp electronic ballast. A zero-voltage-switch quasi-square-wave (ZVS-QSW) dual Buck converter is adopted here. In this paper, a digital control method is proposed to achieve ZVS for the converter. This ZVS can be realized during the whole working condition. Single-cycle-peak-current control is proposed to solve the problem of excessive inductor current during a low-frequency reversal transient. Power loop control is also realized and its consistency for different lamps is good. An AVR special microcontroller for a HID ballast is used to raise the control performance, and the low-frequency square-wave control method is adopted to avoid acoustic resonance. A 70W prototype was built in the laboratory. Experimental results show that the electronic ballast works reliably. Furthermore, the efficiency of the ballast can be higher than 92%.
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Novel Interleaved Single-Stage AC/DC Converter with a High Power Factor and High Efficiency
Yijie Wang,Wei Wang,Xiangjun Zhang,Dianguo Xu 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
A novel single-stage AC/DC converter with the soft-switching characteristic based on interleaving technology and an LLC topology is proposed here. The converter is integrated by an interleaved cell and an LLC cell. Because the components of the system are reduced as a result of integrating, the cost decreases. Since interleaving technology is adopted, the converter can work in a high voltage input state. The LLC topology chosen here ensures that the switches on the primary side work in the ZVS condition and that the diodes on the secondary side work in the ZCS condition, which decreases the switching loss of the system. A theoretical analysis and the design procedures of the proposed converter are proposed and discussed in detail. Simulations and experimental studies with a 100W prototype are done to prove the analysis.
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Wang, Yijie,Zhang, Xiangjun,Wang, Wei,Xu, Dianguo The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
This paper presents a new kind of digital control metal halide lamp electronic ballast. A zero-voltage-switch quasi-square-wave (ZVS-QSW) dual Buck converter is adopted here. In this paper, a digital control method is proposed to achieve ZVS for the converter. This ZVS can be realized during the whole working condition. Single-cycle-peak-current control is proposed to solve the problem of excessive inductor current during a low-frequency reversal transient. Power loop control is also realized and its consistency for different lamps is good. An AVR special microcontroller for a HID ballast is used to raise the control performance, and the low-frequency square-wave control method is adopted to avoid acoustic resonance. A 70W prototype was built in the laboratory. Experimental results show that the electronic ballast works reliably. Furthermore, the efficiency of the ballast can be higher than 92%.
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A High-Reliability Soft-Start Igniter for HPS Lamps
Wang Yifeng,Xu Dianguo,Wang Yijie,Zhang Xiangjun 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, the analysis and design of a new igniter based on half bridge inverter is presented. The proposed igniters can tolerant of the leakage inductance and the parasitic capacitor influence inherent in the transformer. the location of the ignition pulses is near the edge of the square wave automatically. Meanwhile there are enough ignition pulses during a switching period that can ignite high-pressure-sodium (HPS) lamps without any voltage shock. The parameters are given by theoretical calculation, and then verified by PSpice simulation results. At last experimental results of the igniter are presented. Due to the location of ignition pulses, the optimized waveform and high frequency of pulse voltage, the proposed igniter can reliably start most of the 1㎾ HPS lamps without voltage or current surge.
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Novel Interleaved Single-Stage AC/DC Converter with a High Power Factor and High Efficiency
Wang, Yijie,Wang, Wei,Zhang, Xiangjun,Xu, Dianguo The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
A novel single-stage AC/DC converter with the soft-switching characteristic based on interleaving technology and an LLC topology is proposed here. The converter is integrated by an interleaved cell and an LLC cell. Because the components of the system are reduced as a result of integrating, the cost decreases. Since interleaving technology is adopted, the converter can work in a high voltage input state. The LLC topology chosen here ensures that the switches on the primary side work in the ZVS condition and that the diodes on the secondary side work in the ZCS condition, which decreases the switching loss of the system. A theoretical analysis and the design procedures of the proposed converter are proposed and discussed in detail. Simulations and experimental studies with a 100W prototype are done to prove the analysis.
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YiJie WANG,EunJu PARK,KyoungSeop CHO 국제융합경영학회 2024 융합경영연구 Vol.12 No.1
Purpose: By studying the effects of SNS advertising characteristics and SNS advertising music characteristics conducted by companies on advertising preference and advertising effects, we would like to suggest a plan for effective SNS advertising operation. Research design, data and methodology: In this study, a total of 483 surveys were collected for college student consumers in their 20s who had experience seeing advertisements on SNS, and 458 were used for the final analysis. In addition, the collected questionnaire data were analyzed using statistical programs SPSS 24.0 and AMOS 24.0, and Sobel Test was performed through structural equation modeling and regression analysis. Results: Advertising preference, purchase, and recommendation intentions increased as consumers who saw advertisements on SNS perceived the characteristics of advertisements (information, entertainment, individuality, and interactivity). However, advertising preference was not formed by SNS advertising music characteristics (fun, information delivery, unconscious stimulation, and emotional homogeneity). In addition, the higher the perception of SNS advertising music characteristics (fun, information delivery, unconscious stimulation, and emotional homogeneity), the more advertising effects such as purchase and recommendation intentions were linked, and the higher the perception of SNS advertising music characteristics (fun, information delivery, unconscious stimulation, and emotional homogeneity), the more advertising effects such as purchase and recommendation intentions could be created. Finally, it was confirmed that advertising preference had a partial mediating effect between SNS advertising characteristics and advertising effects, and between SNS advertising music characteristics and advertising effects. Conclusions: Unlike previous studies that have investigated the causal relationship of advertising effects according to sub-factors such as SNS advertising characteristics and SNS advertising music characteristics, it is significant in that it analyzes the variables used in the study as secondary factors.
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( Yijie Wei ),( Tie Li ),( Bin Wang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
To further understand fundamental mechanisms of primary breakup and mixture formation in diesel engines, high speed microscopic imaging of the near-nozzle fuel behavior during the injection processes was conducted under both non-evaporating and evaporating diesel-like conditions. Fuel was injected into a high temperature and high pressure constant volume chamber by two single-hole injectors with the diameters of 0.14 mm and 0.28 mm. The high speed CMOS camera with a long distance microscopy and the 60 kHz diode laser were employed to record the near-nozzle field injection processes. At the room temperature conditions, small droplets were observed at the spray tip at the start of injection and along the jet boundaries during the quasi-steady injection processes. During the end-of-injection transients, while there were some poorly-atomized large droplets and ligaments with low penetration velocity, the mist-like tiny droplets with diameter around 14 micrometer suspending at the vicinity of the nozzle dominated the droplet number distribution. Under the 4.0 MPa and 900 K ambient conditions, no droplets and ligaments at the spray tip and along the jet boundaries were clearly observed before the end of fuel injection. During the end-of-injection transients, owing to the low penetration velocity and sparse distribution of the fuel, some droplets were observed, indicating the surface tension confining the liquid to a sphere shape; at the same time, however, some cotton-like structures were also observed, implying the diminishment of the surface tension of the fuel. To clarify these phenomena, the transcritical/supercritical effects and beam steering by the unevenness ambient gas with the high temperature were discussed in details.
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Yijie Jia,Zongji Zheng,Meiping Guan,Qian Zhang,Yang Li,Ling Wang,Yaoming Xue 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
Extracellular vesicles (EVs), which contain microRNA (miRNA), constitute a novel means of cell communication that may contribute to the inevitable expansion of renal fibrosis during diabetic kidney disease (DKD). Exendin-4 is effective for treating DKD through its action on GLP1R. However, the effect of exendin-4 on EV miRNA expression and renal cell communication during the development of DKD remains unknown. In this study, we found that EVs derived from HK-2 cells pre-treated with exendin-4 and high glucose (Ex-HG), which were taken up by normal HK-2 cells, resulted in decreased levels of FN and Col-I compared with EVs from HK-2 cells pre-treated with HG alone. Furthermore, we found that pretreatment with HG and exendin-4 may have contributed to a decrease in miR-192 in both HK-2 cells and EVs in a p53-dependent manner. Finally, we demonstrated that the amelioration of renal fibrosis by exendin-4 occurred through a miR-192-GLP1R pathway, indicating a new pathway by which exendin-4 regulates GLP1R. The results of this study suggest that exendin-4 inhibits the transfer of EV miR-192 from HG-induced renal tubular epithelial cells to normal cells, thus inhibiting GLP1R downregulation and protecting renal cells. This study reports a new mechanism by which exendin-4 exerts a protective effect against DKD.
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Jixiang Wang,Jianming Pan,Yijie Yin,Runrun Wu,Xiaohui Dai,Jiangdong Dai,Lin Gao,Hongxiang Ou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
Thermal-responsive and magnetic molecularly imprinted polymers (TMMIPs) based on Fe3O4@carbon (Fe3O4@C) were prepared by free radical polymerization and applied to selective adsorption and controlled release of 2,4,5-trichlorophenol (2,4,5-TCP) from aqueous solution. TMMIPs were composed of multilayer structure, and exhibited magnetic sensitivity, magnetic stability and thermal stability (especially below the. The reversible transform of mean diameter resulted from the change of testing temperature, indicating the thermo-responsive properties of TMMIPs. Selective adsorption and controlled release of 2,4,5-TCP were also investigated at 25 8C and higher temperature (such as 45 8C and 60 8C), respectively.
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