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A Parametric Method of Linear Functional Observers for Linear Timevarying Systems
Da-Ke Gu,Long-Wen Liu,Guang-Ren Duan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
This paper considers the design of a Luenberger observer to estimate the linear multiple states functionalfor linear time-varying (LTV) systems. Based on the solutions to a type of full actuated homogeneous generalizedSylvester matrix equations and the conditions for the existence of observers for LTV systems, general parametricsolutions to Luenberger functional observers are established. With the proposed approach, the functional observerscan be achieved at desired convergence rate of the observation error, and also without any particular transformationfor LTV systems. Finally, a numerical example shows the feasibility and effectiveness of the proposed parametricdesign method for the functional observers in LTV systems.
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Da-Hong Li,Ping Hu,Sheng-tao Xu,Chun-yan Fang,Shuang Tang,Xin-yu Wang,Xing-yan Sun,He Lian,Ying Xu,Xiao-ke Gu,Jin-yi Xu 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.7
Herein, a series of lasiokaurin derivatives were designed and synthesized. All the derivatives together with lasiokaurin and oridonin were tested for their antimicrobial and antiproliferative activity. Compound 16 showed the most promising antimicrobial activity with MICs of 2.0 and 1.0 lg/mL against Gram-Positive bacteria S. aureus and B. subtilis, respectively. All the synthetic lasiokaurin derivatives showed better antiproliferative activity than parent compound lasiokaurin 1. Compound 10 exhibited the strongest cytotoxicity with IC50 values of 0.47 and 0.20 lM against MGC-803 and CaEs-17 cells, accordingly. Moreover, it was shown to have potent antitumor activity in vivo in a murine model of MGC-803 gastric cancer. Preliminary SARs were also concluded based on obtained data. The apoptosis-inducing effects of 10 were further investigated using CaEs-17 cells. The results showed that lasiokaurin derivative 10 could induce apoptosis via mitochondria related pathway and arrest CaEs-17 cell cycle at S phase. Compound 10 could also affect apoptosisrelated proteins that was up-regulation of CDK2 and downregulation of ATM and cyclin A1.
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Study on modulation of near infrared radiation based on plasma photonic crystal
Hao Jiong-Ju,Xie Xun,Gu Ke-Da,Liu Yu-Jie,Xia Lei,Yang Hong-Wei 한국물리학회 2020 Current Applied Physics Vol.20 No.8
In this paper, a plasma photonic crystal (PPC) for infrared radiation modulation which is composed of indium tin oxide (ITO) and plasma is proposed. The performance of plasma photonic crystal in near infrared radiation modulation is researched by transfer matrix method (TMM). The simulation results show that the near infrared radiation pass band can be adjusted by the changing of plasma frequency of plasma. The reflection to near infrared radiation by plasma photonic crystal increases with plasma frequency and that of absorption decreases. In addition, the modulation performance of the plasma photonic crystal at different incidence wave angles is also studied. The results show that the incident wave angles have little effect on the transmission of plasma photonic crystal in near infrared band. The reflection of the plasma photonic crystal to near infrared radiation decreases with increasing of the incident wave angle, but that of the absorption increases with the incident wave angle. Therefore, the proposed plasma photonic crystal has a potential application in tunable near infrared filter devices.
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