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Jiyang Wang,Wenhai Qi,Xianwen Gao,Yonggui Kao 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
The paper is concerned with positive observer design for positive Markovian jump systems with incompletetransition rates and time delays that are mode-dependent and time-varying. Firstly, by applying an appropriateco-positive type Lyapunov-Krasovskii function and free-connection weighting vectors, sufficient conditions areproposed to ensure stochastic stability of the error positive system and existence of the positive observer. All theproposed conditions are derived in linear programming. Finally, an example is given to demonstrate the validity ofthe main results.
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The Monocot-Specific Receptor-like Kinase SDS2 Controls Cell Death and Immunity in Rice
Fan, Jiangbo,Bai, Pengfei,Ning, Yuese,Wang, Jiyang,Shi, Xuetao,Xiong, Yehui,Zhang, Kai,He, Feng,Zhang, Chongyang,Wang, Ruyi,Meng, Xiangzong,Zhou, Jinggeng,Wang, Mo,Shirsekar, Gautam,Park, Chan Ho,Bell Elsevier 2018 Cell host & microbe Vol.23 No.4
<P><B>Summary</B></P> <P>Programmed cell death (PCD) plays critical roles in plant immunity but must be regulated to prevent excessive damage. The E3 ubiquitin ligase SPL11 negatively regulates PCD and immunity in plants. We show that <I>S</I>PL11 cell-<I>d</I>eath <I>s</I>uppressor <I>2</I> (SDS2), an S-domain receptor-like kinase, positively regulates PCD and immunity in rice by engaging and regulating SPL11 and related kinases controlling defense responses. An <I>sds2</I> mutant shows reduced immune responses and enhanced susceptibility to the blast fungus <I>Magnaporthe oryzae</I>. Conversely, <I>SDS2</I> over-expression induces constitutive PCD accompanied by elevated immune responses and enhanced resistance to <I>M. oryzae</I>. SDS2 interacts with and phosphorylates SPL11, which in turn ubiquitinates SDS2, leading to its degradation. In addition, SDS2 interacts with related receptor-like cytoplasmic kinases, OsRLCK118/176, that positively regulate immunity by phosphorylating the NADPH oxidase OsRbohB to stimulate ROS production. Thus, a plasma membrane-resident protein complex consisting of SDS2, SPL11, and OsRLCK118/176 controls PCD and immunity in rice.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The RLK SDS2 positively regulates plant cell death and immunity in rice </LI> <LI> SDS2 phosphorylates E3 ligase SPL11, which in turn ubiquitinates SDS2 for degradation </LI> <LI> SDS2 phosphorylates receptor-like cytoplasmic kinases RLCK118 </LI> <LI> RLCK118 interacts with and phosphorylates the NADPH oxidase OsRbohB </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Ning Wang,Jiyang Dai,Jin Ying 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.6
Aiming at the problem of UAV formation's obstacle avoidance and the consensus of position and velocity in a 3D obstacle environment, a novel distributed obstacle avoidance control algorithm for cooperative formation based on the improved artificial potential field (IAPF) and consensus theory is proposed in this paper. First, the particle model of the UAV and the dynamic model of the second-order system are established, and the topological structure of the communication network of the system is described with the knowledge of graph theory. Second, the attractive potential field function containing the coordination gains factor, the repulsive potential field function containing the influence factor of the repulsive force and the planning angle, and the potential field function between the UAVs containing the communication weight are defined. Then, the variables of position and velocity in the consensus protocol are improved by the reference vector of the formation center and the expected velocity, respectively, and a new formation obstacle avoidance control protocol is designed by combining the IAPF and the theory of consensus. Finally, the Lyapunov function is used to prove the stable convergence of the algorithm. The simulation results show that this method can not only prevent the UAV from colliding with each other while avoiding static and dynamic obstacles but also enable the UAV to quickly restore the expected formation and achieve the consensus of the relative distance, relative height, and velocity.
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Study on preparation and characterization of uniform bismuth nanospheres
Nianjing Ji,Ziqing Li,Yang Chen,Jiyang Wang,Xiulan Duan,Huaidong Jiang 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.5
The uniform and monodisperse bismuth nanospheres were successfully prepared by simple and convenient solvothermalmethod. The bismuth nitrate was reduced by ethylene glycol at 150-200 oC for 20-30 hrs. The nanospheres were characterizedby powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The dispersivity of bismuthnanospheres was investigated using optical microscope. The optimum reaction conditions to prepare the uniform bismuthnanospheres with a narrow diameter range was investigated. The results indicate that the monodisperse bismuth nanospheresprepared at 200 oC possess sizes ranging from 100-200 nm. The formation mechanism of the bismuth nanospheres washypothesized.
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