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ROBUST CONTROL FOR 4WS VEHICLES CONSIDERING A VARYING TIRE-ROAD FRICTION COEFFICIENT
G.-D. YIN,N. CHEN,J.-X. WANG,J.-S. CHEN 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.1
A μ-synthesis for four-wheel steering (4WS) problems is proposed. Applying this method, model uncertainties can be taken into consideration, and a μ-synthesis robust controller is designed with optimized weighting functions to attenuate the external disturbances. In addition, an optimal controller is designed using the well-known optimal control theory. Two different versions of control laws are considered here. In evaluations of vehicle performance with the robust controller, the proposed controller performs adequately with different maneuvers (i.e., J-turn and Fishhook) and on different road conditions (i.e., icy, wet, and dry). The numerical simulation shows that the designed μ-synthesis robust controller can improve the performance of a closed-loop 4WS vehicle, and this controller has good maneuverability, sufficiently robust stability, and good performance robustness against serious disturbances.
Enhanced energy storage properties in PbZrO3 thin films via the incorporation of NiO
Wang X.W.,Chen J.Y.,Hu S.Y.,Yu K.X.,Yang F.,Shi Y.J.,Li J.H.,Hou M.Z.,Liu A.D.,Zheng M.M.,Yin S.Q.,Hu Y.C.,Shang J. 한국물리학회 2023 Current Applied Physics Vol.52 No.-
In this study, NiO–PbZrO3 composite films were deposited on SiO2/Si substrates buffered with LaNiO3 films via the sol-gel coating technique. The effects of NiO addition in PZO thin films on the microstructure, dielectric properties, leakage mechanism, ferroelectric properties and energy storage properties have been discussed. The dielectric constant increased with the addition of NiO, while the leakage current density decreased. Compared with pure PZO films, the maximum polarization of the composite films was improved. For the composite films prepared using the NiO precursor solution with 0.05 mol/L, the recoverable energy storage density of the NiO-PZO composite film is up to 19.6 J/cm3 under the electric field of 1038 kV/cm, which is 30% higher than that of the pure PZO film under the same conditions. Also, the energy storage efficiency of the composite film reaches 48%. Accordingly, we demonstrate a simple and convenient method by adding NiO to fabricate thin films with high energy storage performance.
Ryu, J.K.,Jin, H.R.,Yin, G.N.,Kwon, M.H.,Song, K.M.,Choi, M.J.,Park, J.M.,Das, N.D.,Kwon, K.D.,Batbold, D.,Lee, T.,Gao, Z.L.,Kim, K.W.,Kim, W.J.,Suh, J.K. Williams and Wilkins Co 2013 The Journal of urology Vol.190 No.2
Purpose: Erectile dysfunction is often a harbinger of cardiovascular disease. We sought to gain mechanistic insight at the cellular and molecular levels into why erectile dysfunction precedes the clinical consequences of cardiovascular disease. Materials and Methods: Diabetes was induced by intraperitoneal streptozotocin injection in 8-week-old C57BL/6J mice. At 8 weeks after diabetes induction, we determined the expression of endothelial cell-cell junction proteins and vascular endothelial permeability in the penis, heart and hind limb by systemic injection of various vascular space markers (350 Da to 2,000 kDa) or by immunohistochemical staining with antibody to oxidized low density lipoprotein. We also investigated the effect of recombinant Ang1 protein on cavernous endothelial permeability. Results: Alterations in the integrity of the endothelial cell-cell junction, including a decrease in endothelial cell-cell junction proteins and an increase in vascular permeability to fluorescent tracers or oxidized low density lipoprotein, were prominent in the cavernous tissue of diabetic mice. In contrast, no significant changes in endothelial cell-cell junction proteins or vascular permeability were noted in heart or hind limb tissue according to the diabetic condition. Intracavernous injection of Ang1 protein, an anti-permeability factor, significantly decreased cavernous endothelial permeability to oxidized low density lipoprotein by restoring endothelial cell-cell junction proteins in diabetic mice. Conclusions: The incompetent cavernous endothelial cell-cell junction in the diabetic condition provides an important clue to why erectile dysfunction is highly prevalent and often precedes other systemic vascular diseases.
Y.N. Zhang,J. Wang,B. Qi,S.G. Wu,H.R. Chen,H.Y. Luo,D.J. Yin,F.J. Lu,H.J. Zhang,G.H. Qi 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.8
Objective: The objective of the present study was to determine whether mango saponin (MS) could be used as a feed additive in broiler chicks by evaluating growth performance, carcass characteristics, meat quality, and plasma biochemical indices. Methods: A total of 216 1-d-old Arbor Acres male broiler chicks were randomly assigned into three dietary treatments supplemented with 0 (control), 0.14% (MS 0.14%), or 0.28% (MS 0.28%) MS. Each treatment had six replicates (cages) with 12 chicks each. The feeding trial lasted for six weeks. Results: Compared with the control, dietary supplemented with 0.14% or 0.28% MS increased average daily weight gain of chicks in the grower (22 to 42 d) and the whole (1 to 42 d) phases, and the final body weight of chicks on d 42 was higher in MS supplemented groups (p<0.05). Lower L45 min* (lightness) and L24 h* values, lower b24 h* (yellowness) value, and higher a45 min* (redness) and a24 h* values of the breast muscle were observed in chicks fed with 0.28% MS on d 42 (p<0.05). The total antioxidant capacity in plasma increased in MS 0.14% group on d 21 (p<0.001). Lower contents of plasma total cholesterol and triglyceride were observed in chicks fed with 0.28% MS on d 21 and d 42, whereas the group supplemented with 0.14% MS only decreased plasma triglyceride content on d 21 (p<0.05). The glucose content in plasma decreased in MS 0.28% group on d 42 (p<0.001). Conclusion: Overall, MS could be used as a feed additive in broiler chicks, and the supplemental level of 0.28% MS in diet could improve growth performance, meat quality, and plasma lipid metabolism in broiler chicks.
Yin, Y. W.,Burton, J. D.,Kim, Y-M.,Borisevich, A. Y.,Pennycook, S. J.,Yang, S. M.,Noh, T. W.,Gruverman, A.,Li, X. G.,Tsymbal, E. Y.,Li, Qi Nature Publishing Group 2013 NATURE MATERIALS Vol.12 No.5
The range of recently discovered phenomena in complex oxide heterostructures, made possible owing to advances in fabrication techniques, promise new functionalities and device concepts. One issue that has received attention is the bistable electrical modulation of conductivity in ferroelectric tunnel junctions (FTJs) in response to a ferroelectric polarization of the tunnelling barrier, a phenomenon known as the tunnelling electroresistance (TER) effect. Ferroelectric tunnel junctions with ferromagnetic electrodes allow ferroelectric control of the tunnelling spin polarization through the magnetoelectric coupling at the ferromagnet/ferroelectric interface. Here we demonstrate a significant enhancement of TER due to a ferroelectrically induced phase transition at a magnetic complex oxide interface. Ferroelectric tunnel junctions consisting of BaTiO<SUB>3</SUB> tunnelling barriers and La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> electrodes exhibit a TER enhanced by up to ~ 10,000% by a nanometre-thick La<SUB>0.5</SUB>Ca<SUB>0.5</SUB>MnO<SUB>3</SUB> interlayer inserted at one of the interfaces. The observed phenomenon originates from the metal-to-insulator phase transition in La<SUB>0.5</SUB>Ca<SUB>0.5</SUB>MnO<SUB>3</SUB>, driven by the modulation of carrier density through ferroelectric polarization switching. Electrical, ferroelectric and magnetoresistive measurements combined with first-principles calculations provide evidence for a magnetoelectric origin of the enhanced TER, and indicate the presence of defect-mediated conduction in the FTJs. The effect is robust and may serve as a viable route for electronic and spintronic applications.
D. YIN,J.-S. HU 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.6
Recently, motion control for electric vehicles has gradually gained respect in automotive society due toincreased strictness of vehicle safety evaluation over time. Electronic Stability Control (ESC) is the kernel technology, whichrefers to two-dimensional motion stabilization. Many investigations have demonstrated that Direct Yaw-moment Control(DYC) is an effective and practical way to carry out the ESC of electric vehicles. However, based on the drive train ofconventional steering, conventional approaches are using braking to achieve the DYC. This paper proposes a new ESC basedon the construction of DYC. The presented approach is based on a core of individual traction control measures for propulsionwheels. This approach not only constrain the longitudinal slip, but also ensure the performance and the effectiveness of twodimensionalmotion control. With a proper control, the vehicle can be maintained to a nearly neutral-steering under high speedturning. Hence, the vehicle’s dynamic stability can be enhanced under aggressive driving by yaw-moment control. Evaluationof the entire control system is performed by well-acknowledged software, which demonstrates that the vehicle’s dynamicstability can be enhanced under aggressive driving by the proposed approach.
Analysis of trace impurities in neon by a customized gas chromatography
Yin, M.K.,Lim, J.S.,Moon, D.M.,Lee, G.H.,Lee, J. Elsevier 2016 Journal of Chromatography A Vol.1463 No.-
<P>Excimer lasers, widely used in the semiconductor industry, are crucial for analyzing the purity of premix laser gases for the purpose of controlling stable laser output power. In this study, we designed a system for analyzing impurities in pure neon (Ne) base gas by customized GC. Impurities in pure neon (H-2 and He), which cannot be analyzed at the sub-mu mol/mol level using commercial GC detectors, were analyzed by a customized pulsed-discharge Ne ionization detector (PDNeD) and a pressurized injection thermal conductivity detector using Ne as the carrier gas (Pres. Inj. Ne-TCD). From the results, trace species in Ne were identified with the following detection limits: H-2, 0.378 mol/mol; O-2, 0.119 mu mol/mol; CH4, 0.880 mu mol/mol; CO, 0.263 mu mol/mol; CO2, 0.162 mu mol/mol (PDNeD); and He, 0.190 mu mol/mol (Pres. Inj. Ne-TCD). This PDNeD and pressurized injection Ne-TCD technique thus developed permit the quantification of trace impurities present in high-purity Ne. (C) 2016 Published by Elsevier B.V.</P>