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Fault-tolerant Control for Linear System Under Sensor Saturation Constraint
Jun-Wei Zhu,Qiao-Qian Zhou,Jianming Xu,Jian-Wei Dong 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
An observer-based fault-tolerant control method is proposed for a linear system with sensor saturationconstraint. Considering the linear system with simultaneous actuator faults and sensor faults, the sensor saturation would bring the output measurement error of the system, which would result in the estimation performancedegradation. Firstly, the intermediate estimator is modified to estimate the system states and fault signals at thesimultaneous time, and the fault-tolerant controller is designed based on the estimation to compensate the effectof actuator faults effectively. Through Lyapunov stability analysis, the sufficient conditions are obtained to ensurethe states of closed-loop system to be uniformly ultimately bounded. The effect of sensor saturation error can besuppressed by adjusting some specified parameters directly without introducing any performance index. Finally, theeffectiveness and superiority of the proposed method are verified by a simulation example
Characterization and mapping of a Prbs gene controlling spike development in Hordeum vulgare L.
Yi Shang,Jianming Yang,Jinghuan Zhu,Wei Hua,Junmei Wang,Qiaojun Jia 한국유전학회 2014 Genes & Genomics Vol.36 No.3
The barley mutant, poly-row-and-branchedspike (prbs) showed altered inflorescence morphology:complete conversion of the rudimentary lateral spikelets intwo-rowed barley into fully developed fertile spikeletssimilar to the six-rowed phenotype, and additional spikeletsin the middle of spike. Moreover, branched spikes emergedin progeny from a cross between the mutant and a sixrowedbarley cultivar. Morphological observation of thedevelopment of immature spikes of the mutant anddescendants with branched spikes showed that the Prbsgene is involved in spikelet development in the triplemoundstage. In mutant prbs, new meristems initiated atthe flanks of lateral spikelets and middle spikelet meristemswere converted to branch meristems, developing branchedspikes. These observations suggested that the Prbs geneplays a crucial role in spikelet initiation and identitymaintenance. The Prbs gene may be an important modifierin inflorescence differentiation from a panicle into a spike. The branched spikes emerging in hybrids from a crossbetween the mutant and six-rowed barley cultivar were notconferred by the gene vrs1 or Int-c, which decide spikemorphology in six-rowed barley. These results imply thatalthough six-row genes vrs1 and Int-c and prbs have similareffects on lateral spikelet development, they have differentfunctions in branched spikes. The Prbs gene wasmapped to chromosome 3H between SSR markerBmag0023 and marker Cbic60 at a genetic distance of 3.3and 5.4 centimorgans (cM), respectively.
Yanping Zhao,Jianming Gong,Yanfei Wang,Gao Wei 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
Welding residual stresses between 12Cr1MoV and P91 steel pipes were analyzed by experiment and finite element method(FEM). Both measured hoop and axial stresses are in general agree with the simulation results. Meanwhile, to examine the effectof start/stop welding position on residual stresses, a simulation model whose welding passes all started at the same location duringmulti-pass welding was compared with a model whose start/stop positions were uniformly distributed along circumferentialdirection of the dissimilar pipe. The results show that higher residual stresses occurred near the superimposed start/stop positionthan the steady region when calculated by the model whose welding passes all started at the same location. Whereas, start/stopwelding positions which are distributed uniformly along the circumferential direction of the pipe can significantly relieve thiseffect, correspondingly leading to a more uniform residual stress distribution around the multi-pass welded dissimilar pipe.
Ruifang Bu,Jianming Xie,Jihua Yu,Wei-Biao Liao,Xuemei Xiao,Jian Lv,Cuili Wang,Jie Ye,Alejandro Calderón-Urrea 한국식물학회 2016 Journal of Plant Biology Vol.59 No.3
Autotoxicity in plants limits their growth and that of nearby plants of the same species, which has obvious implications in crop yield and quality. Silicon (Si) has been shown to increase plant tolerance to autotoxic stress. However, the physiological mechanisms underlying the effects of Si in alleviating autotoxicity during germination in cucumber (Cucumis sativus L.) are unknown. Cinnamic acid derivatives, such as 3-phenylpropionic acid (PA), are a class of autotoxins present in cucumber root exudates. Our objective was to investigate Si-induced autotoxic stress tolerance in cucumber seedlings by focusing on the effects of Si on the induction of antioxidant defense pathways. We found that PA treatment significantly reduced seed germination, radicle length, lateral root number, fresh weight, AsA and GSH contents, and the activities of SOD, CAT, and APX in cucumber seedlings, while it increased membrane permeability and levels of MDA, proline, O 2 - , and H2O2. Application of Si enhanced growth of PA-treated plants and significantly increased germination rate, radicle length, lateral root number, fresh weight, AsA and GSH levels, and SOD, CAT, POD, and APX activities. These results suggest that exogenous Si alleviates autotoxicity caused by PA during seed germination by increasing antioxidant enzyme activities and mitigating lipid peroxidation.
Park, Young-Uk,Bai, Jianming,Wang, Liping,Yoon, Gabin,Zhang, Wei,Kim, Hyungsub,Lee, Seongsu,Kim, Sung-Wook,Looney, J. Patrick,Kang, Kisuk,Wang, Feng American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.36
<P>Ion exchange is a ubiquitous phenomenon central to wide industrial applications, ranging from traditional (bio)chemical separation to the emerging chimie douce synthesis of materials with metastable structure for batteries and other energy applications. The exchange process is complex, involving substitution and transport of different dons under non-equilibrium conditions, and thus difficult to probe, leaving a gap in mechanistic understanding of kinetic exchange pathways toward final products. Herein, we report in situ tracking kinetic pathways of Li+/Na+ substitution during solvothermal ion-exchange synthesis of LixNa1.5-xVOPO4F0.5 (0 <= x <= 1.5), a promising multi-Li polyanionic cathode for batteries. The real-time observation, corroborated by first-principles calculations, reveals a selective replacement of Na+ by Li+, leading to peculiar Na+/Li+/vacancy orderings in the intermediates. Contradicting the traditional belief of facile topotactic substitution via solid solution reaction, an abrupt two-phase transformation occurs and predominantly governs the kinetics of ion exchange and transport in the ID polyanionic framework, consequently leading to significant difference of Li stoichiometry and electrochemical properties in the exchanged products. The findings may help to pave the way for rational design of ion exchange synthesis for making new materials.</P>
( Kaiyang Bao ),( Xiaoyuan Ma ),( Jianming Wei ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6
Wireless sensors are always deployed in brutal environments, but as we know, the nodes are powered only by non-replaceable batteries with limited energy. Sending, receiving and transporting information require the supply of energy. The essential problem of wireless sensor network (WSN) is to save energy consumption and prolong network lifetime. This paper presents a new communication protocol for WSN called Dynamical Threshold Control Algorithm with three-parameter Particle Swarm Optimization and Ant Colony Optimization based on residual energy (DPA). We first use the state of WSN to partition the region adaptively. Moreover, a three-parameter of particle swarm optimization (PSO) algorithm is proposed and a new fitness function is obtained. The optimal path among the CHs and Base Station (BS) is obtained by the ant colony optimization (ACO) algorithm based on residual energy. Dynamical threshold control algorithm (DTCA) is introduced when we re-select the CHs. Compared to the results obtained by using APSO, ANT and I-LEACH protocols, our DPA protocol tremendously prolongs the lifecycle of network. We observe 48.3%, 43.0%, and 24.9% more percentages of rounds respectively performed by DPA over APSO, ANT and I-LEACH.
Qiumin Yang,Jiangao Yang,Hailin Yang,Wei Su,Jianming Ruan 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.4
This study presented nanosized WC-Co composite powders synthesized using a one-step reduction-carbonization process with a combination of CH4/H2 as a gas carbon source and soluble starch as an in situ carbon source. The results of carbon analysis and X-ray diffraction revealed that WC-Co nanocomposite powders with a pure WC and Co phase could be obtained at 1100 °C after 0.5 h. A higher gas flow ratio of CH4/H2 during the reduction-carbonization process led to a higher total carbon content of the sample. A field emission scanning electron microscope confirmed that the particles in the WC-6 wt% Co composite powders had the lowest average size of 43 nm with equiaxed shapes. A sintering neck was observed in the WC-3 wt% Co composite powders whereas faceted particles were found in the WC-12 wt% Co composite powders. Moreover, this method has advantages of simple processing, rapid synthesis and good applicability in potential industry application.
Lei Du,Lina Wang,Hong Yang,Jianping Duan,Jianming Lai,Wei Wu,Shaohua Fan,Xiaoli Zhi 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.12
Purpose: The purpose of this study was to investigate the influences of sex comb on midleg like-2 (SCML2) on hepatocellular carcinoma (HCC) and potentially related mechanisms. Materials and Methods: SCML2 expression in tumor tissues and cells was analyzed using the TCGA database and/or qRT-PCR. The proliferation of HCC cells was detected by CCK-8, colony formation, and EdU assays. The migration and invasion of HCC cells were detected by transwell and wound healing assays. Apoptosis of HCC cells was determined by flow cytometry. Additionally, qRT-PCR and Western blot were used to detect the expression of SCML2 and Wnt/β-catenin/epithelial–mesenchymal transition (EMT) signaling. A xenograft model in mice was established to verify the in vitro findings. Results: We found that SCML2 was highly expressed in HCC tissues and cells and that high expression of SCML2 was correlated with poor prognosis in HCC patients. SCML2 overexpression promoted proliferation, invasion, and migration and repressed apoptosis of HCC cells. The reverse results were obtained in SCML2-silenced cells. Further, we found that SCML2 activated the Wnt/β-catenin/EMT pathway. SCML2 silencing reduced the protein levels of Wnt3a, β-catenin, N-cadherin, Vimentin, and Snail and enhanced E-cadherin protein expression both in vivo and in vitro. Conclusion: SCML2 silencing inhibits the proliferation, migration, and invasion of HCC cells by regulating the Wnt/β-catenin/EMT pathway.