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Peipei Wu,Shumei Wang,Qicai Chen,Lili Chen,Pengpeng Zhang,Juan Xiao,Xiaoxiao Chen,Meng Liu 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.1
Purpose: Elevation in serum alanine aminotransferase (ALT) levels is a biomarker for metabolic syndrome (MS); however, the relationshiphas not been fully investigated within the reference interval of ALT levels. Our objective was to explore the relationship between serum ALT levels within the reference interval and MS in Chinese adults. Materials and Methods: This cross-sectional study included 16028 adults, who attended routine health check-ups at Shengli OilfieldCentral Hospital from January 2006 to March 2012. The reference interval of serum ALT level was defined as less than 40 U/L. Logistic regression models and restricted cubic spline were used to evaluate the association of ALT with MS. Results: The prevalence of MS in the total population was 13.7% (6.4% for females and 18.4% for males). Multiple logistic regressionshowed that ALT levels were positively associated with MS after adjustment for potential confounding factors. The odds ratio of MS in the top quartile was 4.830 [95% confidence interval (CI): 2.980–7.829] in females and 3.168 (95% CI: 2.649–3.790) in males, compared with the ALT levels in the bottom quartile. The restricted cubic spline models revealed a positive non-linear dose-response relationship between ALT levels and the risk of MS in women (p for nonlinearity was 0.0327), but a positive linear dose-response relationship in men (p for nonlinearity was 0.0659). Conclusion: Serum ALT levels within the reference interval are positively associated with MS in a dose-response manner. ElevatedALT levels, even within the reference interval, may reflect early dysmetabolic changes.
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Second-Order Sliding Mode Control Strategy With Enhanced DC-link Voltage Stability for PWM Rectifier
Yuqi Shen,Qicai Ren,Alian Chen 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
A PWM rectifier is essential to maintain the DC-bus voltage stable in a power router. However, overshoot or drop of DC-link voltage will be caused by load changing or part power fluctuation. Therefore, a novel variable structure sliding mode control (SMC) strategy based on the super-twisting algorithm (STA) is proposed, improving the rectifiers robustness and fast response capability. The influence of voltage error is fully considered in the design of the DC-link voltage control loop. The DC-link voltage is tracked by using STA, which tremendously suppresses voltage fluctuation. The current inner loop is designed based on the second-order sliding mode (SOSM) algorithm to further accelerate the current grid response. The SMC strategy has a faster voltage and current tracking speed than the traditional PI control. In addition, the stability of DC-link voltage is significantly enhanced. Finally, the OPAL-RT digital experimental platform verifies the proposed control strategys effectiveness.
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Ding, Yi,Zhang, Bo,Ren, Qifang,Zhang, Qicai,Zha, Weiwei,Li, Xin,Chen, Shaohua,Oh, Won-Chun The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.2
In this article, pure $m-LaVO_4:Eu^{3+}$ and $t-LaVO_4:Eu^{3+}$ nanocrystals were prepared by an EG-assisted hydrothermal method with regular shapes. A series of controlled experiments showed that the pH value of a mixed solution, the volume ratio of $EG/H_2O$ and the dosage of the doped $Eu^{3+}$ all had an important effect on the sizes and shapes of the final products. Furthermore, the constitutional unit of the products changed from 0D to 2D with an increase in the EG dosage. The PL results showed that $t-LaVO_4$ doped with $Eu^{3+}$ ions had better luminescence properties than $m-LaVO_4$ due to its special structure. All of these results not only expand our understanding of the luminescence properties of lanthanide orthovanadates, but they also elucidate the principles of the crystal growth.
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