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Double-layer Dynamic Decoupling Control System for the Yaw Stability of Four Wheel Steering Vehicle
Ke Shi,Xiaofang Yuan,Qian He 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
The four-wheel steering (4WS) is an efficient method to improve the manoeuvrability of electric vehiclewith the tendency of understeer, by providing the sufficient steering angles. Because of the various kinds of drivingenvironments, the inner coupling between the active front and rear wheels of the 4WS vehicle is a challengingproblem, which usually results in unstable yaw stability of the vehicle. In order to solve this coupling problem,this paper presents a double-layer dynamic decoupling control system (DDDCS), which consists of an upper partdynamicdecoupling unit (DDU) and a lower part-steering control unit (SCU). The DDU is presented to solve thedynamic coupling problem between the active front and rear wheels, and separately establishes two decoupledmodels by the diagonal decoupling method. The SCU is designed to obtain the decoupled control signals by themodel predictive controller, then, the yaw stability of 4WS vehicle can be guaranteed. The results of the simulationshow that the proposed DDDCS has good decoupling performance and stable yaw performance for 4WS vehicle.
Mengyang Du,Lin Jiang,Xiaofang Tang,Zhan Gao,Bo Xu,Jinqing Yuan 대한심장학회 2021 Korean Circulation Journal Vol.51 No.2
Background and Objectives: This study investigated the relative incidence of contrast induced nephropathy (CIN) and long-term outcomes between iso-osmolar contrast media (IOCM) and low-osmolar contrast media (LOCM) undergoing elective percutaneous coronary intervention (PCI). Methods: A total of 9,431 patients receiving elective PCI were enrolled in the cohort. The patients were divided into IOCM group and LOCM group. Propensity score matching (PSM) was applied to minimize the selection bias between groups. Results: The multivariate analysis showed that the use of IOCM compared with LOCM did not affect the CIN incidence (odds ratio [OR], 0.912; 95% confidence interval [CI], 0.576–1.446; p=0.696). After PSM, the incidence of CIN was 1.5% and 4.0% in IOCM group (n=979) and LOCM group (n=979), respectively, p=0.001. IOCM significantly reduced the incidence of CIN compared with LOCM (OR, 0.393; 95% CI, 0.214–0.722; p=0.003). After 2 years of follow-up, the all-cause mortality was higher in IOCM group than LOCM group (2.1% vs. 0.9%, p<0.001). Cox regression analysis showed IOCM was not independent risk factor of 2-years all-cause mortality (OR, 0.849; 95% CI, 0.510–1.412; p=0.528). After PSM, the difference of all-cause death between groups disappeared (1.7% vs. 1.9%, p=0.739). Cox regression analysis showed that the use of IOCM compared with LOCM did not affect the incidence of 2-year all-cause mortality (OR, 1.037; 95% CI, 0.534–2.014; p=0.915). Conclusions: Compared with LOCM, IOCM significantly reduced the incidence of CIN after elective PCI, but had no significant effect on 2-year all-cause mortality.
Man Zhang,Yanwei Sui,Xiaofang Yuan,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yezeng He,Yaojian Ren,Zhi Sun,Jinlong Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.3
A nanoflower structure of Zn0.76Co0.24S directly grown on carbon fiber papers (CFP) was successfully designed by a mild two-step hydrothermal method. Benefiting from their fascinating structural features, Zn0.76Co0.24S/CFP electrode exhibits a maximum specific capacitance of 300 F g -1 at current density of 1 A g -1 and 84% capacitance retention after 5,000 cycles at current density of 5 Ag -1. Subsequently, Zn0.76Co0.24S/CFP//AC all-solid-state asymmetric supercapacitor (ASC) device is assembled and able to illuminate the red LEDs. ASC devices deliver a maximum energy density of 9.59 Wh kg -1 at a power density of 750 W kg -1. Therefore, this impressive result demonstrates that the nanoflower Zn0.76Co0.24S have promising applications in the development of high-performance supercapacitors.
Kim, Ji-Won,Choi, Bo-Hyun,Jung, Jin-Ho,Yuan, Xiaofang,Kim, Ju Min,Lee, Pyung Cheon Elsevier 2018 PROCESS BIOCHEMISTRY Vol.75 No.-
<P><B>Abstract</B></P> <P>Genome resequencing of <SMALL>D</SMALL>-lactic acid-producing <I>Leuconostoc mesenteroides</I> ATCC 8293 revealed 28 base errors in the version published in the 2017. Based on the revised genome annotation, four genes encoding putative <SMALL>D</SMALL>-lactate dehydrogenases were identified. The transcriptional expression of each gene was analyzed at different growth phases and the functionality of each gene was studied in <I>Escherichia coli</I>. Bioreactor studies indicated that <I>L. mesenteroides</I> ATCC 8293 produced <SMALL>D</SMALL>-lactic acid and ethanol at a ratio of 1.7:1 (g/g) regardless of the glucose concentration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Genome of <I>Leuconostoc mesenteriodes</I> ATCC 8293 was resequenced and reannotated. </LI> <LI> Expression of four genes encoding putative <SMALL>D</SMALL>-lactate dehydrogenases was analyzed using RT-PCR. </LI> <LI> Functionality of the four <SMALL>D</SMALL>-lactate dehydrogenases was investigated in <I>E. coli.</I> </LI> <LI> <I>L. mesenteroides</I> ATCC 8293 produced <SMALL>D</SMALL>-lactic acid and ethanol at a ratio of 1.7:1 regardless of the glucose concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>